Merge remote-tracking branch 'upstream/master'

161 files changed, 26496 insertions, 0 deletions

diff --git a/drivers/opus/silk/A2NLSF.c b/drivers/opus/silk/A2NLSF.c
new file mode 100644
index 0000000000..cec53a5cd8
--- /dev/null
+++ b/drivers/opus/silk/A2NLSF.c
@@ -0,0 +1,252 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+/* Conversion between prediction filter coefficients and NLSFs  */
+/* Requires the order to be an even number                      */
+/* A piecewise linear approximation maps LSF <-> cos(LSF)       */
+/* Therefore the result is not accurate NLSFs, but the two      */
+/* functions are accurate inverses of each other                */
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "tables.h"
+
+/* Number of binary divisions, when not in low complexity mode */
+#define BIN_DIV_STEPS_A2NLSF_FIX      3 /* must be no higher than 16 - log2( LSF_COS_TAB_SZ_FIX ) */
+#define MAX_ITERATIONS_A2NLSF_FIX    30
+
+/* Helper function for A2NLSF(..)                    */
+/* Transforms polynomials from cos(n*f) to cos(f)^n  */
+static OPUS_INLINE void silk_A2NLSF_trans_poly(
+    opus_int32          *p,                     /* I/O    Polynomial                                */
+    const opus_int      dd                      /* I      Polynomial order (= filter order / 2 )    */
+)
+{
+    opus_int k, n;
+
+    for( k = 2; k <= dd; k++ ) {
+        for( n = dd; n > k; n-- ) {
+            p[ n - 2 ] -= p[ n ];
+        }
+        p[ k - 2 ] -= silk_LSHIFT( p[ k ], 1 );
+    }
+}
+/* Helper function for A2NLSF(..) */
+/* Polynomial evaluation          */
+static OPUS_INLINE opus_int32 silk_A2NLSF_eval_poly( /* return the polynomial evaluation, in Q16     */
+    opus_int32          *p,                     /* I    Polynomial, Q16                         */
+    const opus_int32    x,                      /* I    Evaluation point, Q12                   */
+    const opus_int      dd                      /* I    Order                                   */
+)
+{
+    opus_int   n;
+    opus_int32 x_Q16, y32;
+
+    y32 = p[ dd ];                                  /* Q16 */
+    x_Q16 = silk_LSHIFT( x, 4 );
+    for( n = dd - 1; n >= 0; n-- ) {
+        y32 = silk_SMLAWW( p[ n ], y32, x_Q16 );    /* Q16 */
+    }
+    return y32;
+}
+
+static OPUS_INLINE void silk_A2NLSF_init(
+     const opus_int32    *a_Q16,
+     opus_int32          *P,
+     opus_int32          *Q,
+     const opus_int      dd
+)
+{
+    opus_int k;
+
+    /* Convert filter coefs to even and odd polynomials */
+    P[dd] = silk_LSHIFT( 1, 16 );
+    Q[dd] = silk_LSHIFT( 1, 16 );
+    for( k = 0; k < dd; k++ ) {
+        P[ k ] = -a_Q16[ dd - k - 1 ] - a_Q16[ dd + k ];    /* Q16 */
+        Q[ k ] = -a_Q16[ dd - k - 1 ] + a_Q16[ dd + k ];    /* Q16 */
+    }
+
+    /* Divide out zeros as we have that for even filter orders, */
+    /* z =  1 is always a root in Q, and                        */
+    /* z = -1 is always a root in P                             */
+    for( k = dd; k > 0; k-- ) {
+        P[ k - 1 ] -= P[ k ];
+        Q[ k - 1 ] += Q[ k ];
+    }
+
+    /* Transform polynomials from cos(n*f) to cos(f)^n */
+    silk_A2NLSF_trans_poly( P, dd );
+    silk_A2NLSF_trans_poly( Q, dd );
+}
+
+/* Compute Normalized Line Spectral Frequencies (NLSFs) from whitening filter coefficients      */
+/* If not all roots are found, the a_Q16 coefficients are bandwidth expanded until convergence. */
+void silk_A2NLSF(
+    opus_int16                  *NLSF,              /* O    Normalized Line Spectral Frequencies in Q15 (0..2^15-1) [d] */
+    opus_int32                  *a_Q16,             /* I/O  Monic whitening filter coefficients in Q16 [d]              */
+    const opus_int              d                   /* I    Filter order (must be even)                                 */
+)
+{
+    opus_int      i, k, m, dd, root_ix, ffrac;
+    opus_int32 xlo, xhi, xmid;
+    opus_int32 ylo, yhi, ymid, thr;
+    opus_int32 nom, den;
+    opus_int32 P[ SILK_MAX_ORDER_LPC / 2 + 1 ];
+    opus_int32 Q[ SILK_MAX_ORDER_LPC / 2 + 1 ];
+    opus_int32 *PQ[ 2 ];
+    opus_int32 *p;
+
+    /* Store pointers to array */
+    PQ[ 0 ] = P;
+    PQ[ 1 ] = Q;
+
+    dd = silk_RSHIFT( d, 1 );
+
+    silk_A2NLSF_init( a_Q16, P, Q, dd );
+
+    /* Find roots, alternating between P and Q */
+    p = P;                          /* Pointer to polynomial */
+
+    xlo = silk_LSFCosTab_FIX_Q12[ 0 ]; /* Q12*/
+    ylo = silk_A2NLSF_eval_poly( p, xlo, dd );
+
+    if( ylo < 0 ) {
+        /* Set the first NLSF to zero and move on to the next */
+        NLSF[ 0 ] = 0;
+        p = Q;                      /* Pointer to polynomial */
+        ylo = silk_A2NLSF_eval_poly( p, xlo, dd );
+        root_ix = 1;                /* Index of current root */
+    } else {
+        root_ix = 0;                /* Index of current root */
+    }
+    k = 1;                          /* Loop counter */
+    i = 0;                          /* Counter for bandwidth expansions applied */
+    thr = 0;
+    while( 1 ) {
+        /* Evaluate polynomial */
+        xhi = silk_LSFCosTab_FIX_Q12[ k ]; /* Q12 */
+        yhi = silk_A2NLSF_eval_poly( p, xhi, dd );
+
+        /* Detect zero crossing */
+        if( ( ylo <= 0 && yhi >= thr ) || ( ylo >= 0 && yhi <= -thr ) ) {
+            if( yhi == 0 ) {
+                /* If the root lies exactly at the end of the current       */
+                /* interval, look for the next root in the next interval    */
+                thr = 1;
+            } else {
+                thr = 0;
+            }
+            /* Binary division */
+            ffrac = -256;
+            for( m = 0; m < BIN_DIV_STEPS_A2NLSF_FIX; m++ ) {
+                /* Evaluate polynomial */
+                xmid = silk_RSHIFT_ROUND( xlo + xhi, 1 );
+                ymid = silk_A2NLSF_eval_poly( p, xmid, dd );
+
+                /* Detect zero crossing */
+                if( ( ylo <= 0 && ymid >= 0 ) || ( ylo >= 0 && ymid <= 0 ) ) {
+                    /* Reduce frequency */
+                    xhi = xmid;
+                    yhi = ymid;
+                } else {
+                    /* Increase frequency */
+                    xlo = xmid;
+                    ylo = ymid;
+                    ffrac = silk_ADD_RSHIFT( ffrac, 128, m );
+                }
+            }
+
+            /* Interpolate */
+            if( silk_abs( ylo ) < 65536 ) {
+                /* Avoid dividing by zero */
+                den = ylo - yhi;
+                nom = silk_LSHIFT( ylo, 8 - BIN_DIV_STEPS_A2NLSF_FIX ) + silk_RSHIFT( den, 1 );
+                if( den != 0 ) {
+                    ffrac += silk_DIV32( nom, den );
+                }
+            } else {
+                /* No risk of dividing by zero because abs(ylo - yhi) >= abs(ylo) >= 65536 */
+                ffrac += silk_DIV32( ylo, silk_RSHIFT( ylo - yhi, 8 - BIN_DIV_STEPS_A2NLSF_FIX ) );
+            }
+            NLSF[ root_ix ] = (opus_int16)silk_min_32( silk_LSHIFT( (opus_int32)k, 8 ) + ffrac, silk_int16_MAX );
+
+            silk_assert( NLSF[ root_ix ] >= 0 );
+
+            root_ix++;        /* Next root */
+            if( root_ix >= d ) {
+                /* Found all roots */
+                break;
+            }
+            /* Alternate pointer to polynomial */
+            p = PQ[ root_ix & 1 ];
+
+            /* Evaluate polynomial */
+            xlo = silk_LSFCosTab_FIX_Q12[ k - 1 ]; /* Q12*/
+            ylo = silk_LSHIFT( 1 - ( root_ix & 2 ), 12 );
+        } else {
+            /* Increment loop counter */
+            k++;
+            xlo = xhi;
+            ylo = yhi;
+            thr = 0;
+
+            if( k > LSF_COS_TAB_SZ_FIX ) {
+                i++;
+                if( i > MAX_ITERATIONS_A2NLSF_FIX ) {
+                    /* Set NLSFs to white spectrum and exit */
+                    NLSF[ 0 ] = (opus_int16)silk_DIV32_16( 1 << 15, d + 1 );
+                    for( k = 1; k < d; k++ ) {
+                        NLSF[ k ] = (opus_int16)silk_SMULBB( k + 1, NLSF[ 0 ] );
+                    }
+                    return;
+                }
+
+                /* Error: Apply progressively more bandwidth expansion and run again */
+                silk_bwexpander_32( a_Q16, d, 65536 - silk_SMULBB( 10 + i, i ) ); /* 10_Q16 = 0.00015*/
+
+                silk_A2NLSF_init( a_Q16, P, Q, dd );
+                p = P;                            /* Pointer to polynomial */
+                xlo = silk_LSFCosTab_FIX_Q12[ 0 ]; /* Q12*/
+                ylo = silk_A2NLSF_eval_poly( p, xlo, dd );
+                if( ylo < 0 ) {
+                    /* Set the first NLSF to zero and move on to the next */
+                    NLSF[ 0 ] = 0;
+                    p = Q;                        /* Pointer to polynomial */
+                    ylo = silk_A2NLSF_eval_poly( p, xlo, dd );
+                    root_ix = 1;                  /* Index of current root */
+                } else {
+                    root_ix = 0;                  /* Index of current root */
+                }
+                k = 1;                            /* Reset loop counter */
+            }
+        }
+    }
+}
diff --git a/drivers/opus/silk/API.h b/drivers/opus/silk/API.h
new file mode 100644
index 0000000000..f0601bcf6b
--- /dev/null
+++ b/drivers/opus/silk/API.h
@@ -0,0 +1,133 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_API_H
+#define SILK_API_H
+
+#include "control.h"
+#include "typedef.h"
+#include "errors.h"
+#include "entenc.h"
+#include "entdec.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#define SILK_MAX_FRAMES_PER_PACKET  3
+
+/* Struct for TOC (Table of Contents) */
+typedef struct {
+    opus_int    VADFlag;                                /* Voice activity for packet                            */
+    opus_int    VADFlags[ SILK_MAX_FRAMES_PER_PACKET ]; /* Voice activity for each frame in packet              */
+    opus_int    inbandFECFlag;                          /* Flag indicating if packet contains in-band FEC       */
+} silk_TOC_struct;
+
+/****************************************/
+/* Encoder functions                    */
+/****************************************/
+
+/***********************************************/
+/* Get size in bytes of the Silk encoder state */
+/***********************************************/
+opus_int silk_Get_Encoder_Size(                         /* O    Returns error code                              */
+    opus_int                        *encSizeBytes       /* O    Number of bytes in SILK encoder state           */
+);
+
+/*************************/
+/* Init or reset encoder */
+/*************************/
+opus_int silk_InitEncoder(                              /* O    Returns error code                              */
+    void                            *encState,          /* I/O  State                                           */
+    int                              arch,              /* I    Run-time architecture                           */
+    silk_EncControlStruct           *encStatus          /* O    Encoder Status                                  */
+);
+
+/**************************/
+/* Encode frame with Silk */
+/**************************/
+/* Note: if prefillFlag is set, the input must contain 10 ms of audio, irrespective of what                     */
+/* encControl->payloadSize_ms is set to                                                                         */
+opus_int silk_Encode(                                   /* O    Returns error code                              */
+    void                            *encState,          /* I/O  State                                           */
+    silk_EncControlStruct           *encControl,        /* I    Control status                                  */
+    const opus_int16                *samplesIn,         /* I    Speech sample input vector                      */
+    opus_int                        nSamplesIn,         /* I    Number of samples in input vector               */
+    ec_enc                          *psRangeEnc,        /* I/O  Compressor data structure                       */
+    opus_int32                      *nBytesOut,         /* I/O  Number of bytes in payload (input: Max bytes)   */
+    const opus_int                  prefillFlag         /* I    Flag to indicate prefilling buffers no coding   */
+);
+
+/****************************************/
+/* Decoder functions                    */
+/****************************************/
+
+/***********************************************/
+/* Get size in bytes of the Silk decoder state */
+/***********************************************/
+opus_int silk_Get_Decoder_Size(                         /* O    Returns error code                              */
+    opus_int                        *decSizeBytes       /* O    Number of bytes in SILK decoder state           */
+);
+
+/*************************/
+/* Init or Reset decoder */
+/*************************/
+opus_int silk_InitDecoder(                              /* O    Returns error code                              */
+    void                            *decState           /* I/O  State                                           */
+);
+
+/******************/
+/* Decode a frame */
+/******************/
+opus_int silk_Decode(                                   /* O    Returns error code                              */
+    void*                           decState,           /* I/O  State                                           */
+    silk_DecControlStruct*          decControl,         /* I/O  Control Structure                               */
+    opus_int                        lostFlag,           /* I    0: no loss, 1 loss, 2 decode fec                */
+    opus_int                        newPacketFlag,      /* I    Indicates first decoder call for this packet    */
+    ec_dec                          *psRangeDec,        /* I/O  Compressor data structure                       */
+    opus_int16                      *samplesOut,        /* O    Decoded output speech vector                    */
+    opus_int32                      *nSamplesOut        /* O    Number of samples decoded                       */
+);
+
+#if 0
+/**************************************/
+/* Get table of contents for a packet */
+/**************************************/
+opus_int silk_get_TOC(
+    const opus_uint8                *payload,           /* I    Payload data                                */
+    const opus_int                  nBytesIn,           /* I    Number of input bytes                       */
+    const opus_int                  nFramesPerPayload,  /* I    Number of SILK frames per payload           */
+    silk_TOC_struct                 *Silk_TOC           /* O    Type of content                             */
+);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/CNG.c b/drivers/opus/silk/CNG.c
new file mode 100644
index 0000000000..8b8dbf882c
--- /dev/null
+++ b/drivers/opus/silk/CNG.c
@@ -0,0 +1,172 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+/* Generates excitation for CNG LPC synthesis */
+static OPUS_INLINE void silk_CNG_exc(
+    opus_int32                       residual_Q10[],     /* O    CNG residual signal Q10                     */
+    opus_int32                       exc_buf_Q14[],      /* I    Random samples buffer Q10                   */
+    opus_int32                       Gain_Q16,           /* I    Gain to apply                               */
+    opus_int                         length,             /* I    Length                                      */
+    opus_int32                       *rand_seed          /* I/O  Seed to random index generator              */
+)
+{
+    opus_int32 seed;
+    opus_int   i, idx, exc_mask;
+
+    exc_mask = CNG_BUF_MASK_MAX;
+    while( exc_mask > length ) {
+        exc_mask = silk_RSHIFT( exc_mask, 1 );
+    }
+
+    seed = *rand_seed;
+    for( i = 0; i < length; i++ ) {
+        seed = silk_RAND( seed );
+        idx = (opus_int)( silk_RSHIFT( seed, 24 ) & exc_mask );
+        silk_assert( idx >= 0 );
+        silk_assert( idx <= CNG_BUF_MASK_MAX );
+        residual_Q10[ i ] = (opus_int16)silk_SAT16( silk_SMULWW( exc_buf_Q14[ idx ], Gain_Q16 >> 4 ) );
+    }
+    *rand_seed = seed;
+}
+
+void silk_CNG_Reset(
+    silk_decoder_state          *psDec                          /* I/O  Decoder state                               */
+)
+{
+    opus_int i, NLSF_step_Q15, NLSF_acc_Q15;
+
+    NLSF_step_Q15 = silk_DIV32_16( silk_int16_MAX, psDec->LPC_order + 1 );
+    NLSF_acc_Q15 = 0;
+    for( i = 0; i < psDec->LPC_order; i++ ) {
+        NLSF_acc_Q15 += NLSF_step_Q15;
+        psDec->sCNG.CNG_smth_NLSF_Q15[ i ] = NLSF_acc_Q15;
+    }
+    psDec->sCNG.CNG_smth_Gain_Q16 = 0;
+    psDec->sCNG.rand_seed = 3176576;
+}
+
+/* Updates CNG estimate, and applies the CNG when packet was lost   */
+void silk_CNG(
+    silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
+    silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
+    opus_int16                  frame[],                        /* I/O  Signal                                      */
+    opus_int                    length                          /* I    Length of residual                          */
+)
+{
+    opus_int   i, subfr;
+    opus_int32 sum_Q6, max_Gain_Q16;
+    opus_int16 A_Q12[ MAX_LPC_ORDER ];
+    silk_CNG_struct *psCNG = &psDec->sCNG;
+    SAVE_STACK;
+
+    if( psDec->fs_kHz != psCNG->fs_kHz ) {
+        /* Reset state */
+        silk_CNG_Reset( psDec );
+
+        psCNG->fs_kHz = psDec->fs_kHz;
+    }
+    if( psDec->lossCnt == 0 && psDec->prevSignalType == TYPE_NO_VOICE_ACTIVITY ) {
+        /* Update CNG parameters */
+
+        /* Smoothing of LSF's  */
+        for( i = 0; i < psDec->LPC_order; i++ ) {
+            psCNG->CNG_smth_NLSF_Q15[ i ] += silk_SMULWB( (opus_int32)psDec->prevNLSF_Q15[ i ] - (opus_int32)psCNG->CNG_smth_NLSF_Q15[ i ], CNG_NLSF_SMTH_Q16 );
+        }
+        /* Find the subframe with the highest gain */
+        max_Gain_Q16 = 0;
+        subfr        = 0;
+        for( i = 0; i < psDec->nb_subfr; i++ ) {
+            if( psDecCtrl->Gains_Q16[ i ] > max_Gain_Q16 ) {
+                max_Gain_Q16 = psDecCtrl->Gains_Q16[ i ];
+                subfr        = i;
+            }
+        }
+        /* Update CNG excitation buffer with excitation from this subframe */
+        silk_memmove( &psCNG->CNG_exc_buf_Q14[ psDec->subfr_length ], psCNG->CNG_exc_buf_Q14, ( psDec->nb_subfr - 1 ) * psDec->subfr_length * sizeof( opus_int32 ) );
+        silk_memcpy(   psCNG->CNG_exc_buf_Q14, &psDec->exc_Q14[ subfr * psDec->subfr_length ], psDec->subfr_length * sizeof( opus_int32 ) );
+
+        /* Smooth gains */
+        for( i = 0; i < psDec->nb_subfr; i++ ) {
+            psCNG->CNG_smth_Gain_Q16 += silk_SMULWB( psDecCtrl->Gains_Q16[ i ] - psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_Q16 );
+        }
+    }
+
+    /* Add CNG when packet is lost or during DTX */
+    if( psDec->lossCnt ) {
+        VARDECL( opus_int32, CNG_sig_Q10 );
+
+        ALLOC( CNG_sig_Q10, length + MAX_LPC_ORDER, opus_int32 );
+
+        /* Generate CNG excitation */
+        silk_CNG_exc( CNG_sig_Q10 + MAX_LPC_ORDER, psCNG->CNG_exc_buf_Q14, psCNG->CNG_smth_Gain_Q16, length, &psCNG->rand_seed );
+
+        /* Convert CNG NLSF to filter representation */
+        silk_NLSF2A( A_Q12, psCNG->CNG_smth_NLSF_Q15, psDec->LPC_order );
+
+        /* Generate CNG signal, by synthesis filtering */
+        silk_memcpy( CNG_sig_Q10, psCNG->CNG_synth_state, MAX_LPC_ORDER * sizeof( opus_int32 ) );
+        for( i = 0; i < length; i++ ) {
+            silk_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 );
+            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+            sum_Q6 = silk_RSHIFT( psDec->LPC_order, 1 );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  1 ], A_Q12[ 0 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  2 ], A_Q12[ 1 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  3 ], A_Q12[ 2 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  4 ], A_Q12[ 3 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  5 ], A_Q12[ 4 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  6 ], A_Q12[ 5 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  7 ], A_Q12[ 6 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  8 ], A_Q12[ 7 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i -  9 ], A_Q12[ 8 ] );
+            sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 10 ], A_Q12[ 9 ] );
+            if( psDec->LPC_order == 16 ) {
+                sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 11 ], A_Q12[ 10 ] );
+                sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 12 ], A_Q12[ 11 ] );
+                sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 13 ], A_Q12[ 12 ] );
+                sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 14 ], A_Q12[ 13 ] );
+                sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 15 ], A_Q12[ 14 ] );
+                sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 16 ], A_Q12[ 15 ] );
+            }
+
+            /* Update states */
+            CNG_sig_Q10[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT( CNG_sig_Q10[ MAX_LPC_ORDER + i ], sum_Q6, 4 );
+
+            frame[ i ] = silk_ADD_SAT16( frame[ i ], silk_RSHIFT_ROUND( sum_Q6, 6 ) );
+        }
+        silk_memcpy( psCNG->CNG_synth_state, &CNG_sig_Q10[ length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
+    } else {
+        silk_memset( psCNG->CNG_synth_state, 0, psDec->LPC_order *  sizeof( opus_int32 ) );
+    }
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/HP_variable_cutoff.c b/drivers/opus/silk/HP_variable_cutoff.c
new file mode 100644
index 0000000000..379752bb19
--- /dev/null
+++ b/drivers/opus/silk/HP_variable_cutoff.c
@@ -0,0 +1,77 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+#ifdef OPUS_FIXED_POINT
+#include "main_FIX.h"
+#else
+#include "main_FLP.h"
+#endif
+#include "tuning_parameters.h"
+
+/* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */
+void silk_HP_variable_cutoff(
+    silk_encoder_state_Fxx          state_Fxx[]                         /* I/O  Encoder states                              */
+)
+{
+   opus_int   quality_Q15;
+   opus_int32 pitch_freq_Hz_Q16, pitch_freq_log_Q7, delta_freq_Q7;
+   silk_encoder_state *psEncC1 = &state_Fxx[ 0 ].sCmn;
+
+   /* Adaptive cutoff frequency: estimate low end of pitch frequency range */
+   if( psEncC1->prevSignalType == TYPE_VOICED ) {
+      /* difference, in log domain */
+      pitch_freq_Hz_Q16 = silk_DIV32_16( silk_LSHIFT( silk_MUL( psEncC1->fs_kHz, 1000 ), 16 ), psEncC1->prevLag );
+      pitch_freq_log_Q7 = silk_lin2log( pitch_freq_Hz_Q16 ) - ( 16 << 7 );
+
+      /* adjustment based on quality */
+      quality_Q15 = psEncC1->input_quality_bands_Q15[ 0 ];
+      pitch_freq_log_Q7 = silk_SMLAWB( pitch_freq_log_Q7, silk_SMULWB( silk_LSHIFT( -quality_Q15, 2 ), quality_Q15 ),
+            pitch_freq_log_Q7 - ( silk_lin2log( SILK_FIX_CONST( VARIABLE_HP_MIN_CUTOFF_HZ, 16 ) ) - ( 16 << 7 ) ) );
+
+      /* delta_freq = pitch_freq_log - psEnc->variable_HP_smth1; */
+      delta_freq_Q7 = pitch_freq_log_Q7 - silk_RSHIFT( psEncC1->variable_HP_smth1_Q15, 8 );
+      if( delta_freq_Q7 < 0 ) {
+         /* less smoothing for decreasing pitch frequency, to track something close to the minimum */
+         delta_freq_Q7 = silk_MUL( delta_freq_Q7, 3 );
+      }
+
+      /* limit delta, to reduce impact of outliers in pitch estimation */
+      delta_freq_Q7 = silk_LIMIT_32( delta_freq_Q7, -SILK_FIX_CONST( VARIABLE_HP_MAX_DELTA_FREQ, 7 ), SILK_FIX_CONST( VARIABLE_HP_MAX_DELTA_FREQ, 7 ) );
+
+      /* update smoother */
+      psEncC1->variable_HP_smth1_Q15 = silk_SMLAWB( psEncC1->variable_HP_smth1_Q15,
+            silk_SMULBB( psEncC1->speech_activity_Q8, delta_freq_Q7 ), SILK_FIX_CONST( VARIABLE_HP_SMTH_COEF1, 16 ) );
+
+      /* limit frequency range */
+      psEncC1->variable_HP_smth1_Q15 = silk_LIMIT_32( psEncC1->variable_HP_smth1_Q15,
+            silk_LSHIFT( silk_lin2log( VARIABLE_HP_MIN_CUTOFF_HZ ), 8 ),
+            silk_LSHIFT( silk_lin2log( VARIABLE_HP_MAX_CUTOFF_HZ ), 8 ) );
+   }
+}
diff --git a/drivers/opus/silk/Inlines.h b/drivers/opus/silk/Inlines.h
new file mode 100644
index 0000000000..ec986cdfdd
--- /dev/null
+++ b/drivers/opus/silk/Inlines.h
@@ -0,0 +1,188 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+/*! \file silk_Inlines.h
+ *  \brief silk_Inlines.h defines OPUS_INLINE signal processing functions.
+ */
+
+#ifndef SILK_FIX_INLINES_H
+#define SILK_FIX_INLINES_H
+
+#ifdef  __cplusplus
+extern "C"
+{
+#endif
+
+/* count leading zeros of opus_int64 */
+static OPUS_INLINE opus_int32 silk_CLZ64( opus_int64 in )
+{
+    opus_int32 in_upper;
+
+    in_upper = (opus_int32)silk_RSHIFT64(in, 32);
+    if (in_upper == 0) {
+        /* Search in the lower 32 bits */
+        return 32 + silk_CLZ32( (opus_int32) in );
+    } else {
+        /* Search in the upper 32 bits */
+        return silk_CLZ32( in_upper );
+    }
+}
+
+/* get number of leading zeros and fractional part (the bits right after the leading one */
+static OPUS_INLINE void silk_CLZ_FRAC(
+    opus_int32 in,            /* I  input                               */
+    opus_int32 *lz,           /* O  number of leading zeros             */
+    opus_int32 *frac_Q7       /* O  the 7 bits right after the leading one */
+)
+{
+    opus_int32 lzeros = silk_CLZ32(in);
+
+    * lz = lzeros;
+    * frac_Q7 = silk_ROR32(in, 24 - lzeros) & 0x7f;
+}
+
+/* Approximation of square root                                          */
+/* Accuracy: < +/- 10%  for output values > 15                           */
+/*           < +/- 2.5% for output values > 120                          */
+static OPUS_INLINE opus_int32 silk_SQRT_APPROX( opus_int32 x )
+{
+    opus_int32 y, lz, frac_Q7;
+
+    if( x <= 0 ) {
+        return 0;
+    }
+
+    silk_CLZ_FRAC(x, &lz, &frac_Q7);
+
+    if( lz & 1 ) {
+        y = 32768;
+    } else {
+        y = 46214;        /* 46214 = sqrt(2) * 32768 */
+    }
+
+    /* get scaling right */
+    y >>= silk_RSHIFT(lz, 1);
+
+    /* increment using fractional part of input */
+    y = silk_SMLAWB(y, y, silk_SMULBB(213, frac_Q7));
+
+    return y;
+}
+
+/* Divide two int32 values and return result as int32 in a given Q-domain */
+static OPUS_INLINE opus_int32 silk_DIV32_varQ(   /* O    returns a good approximation of "(a32 << Qres) / b32" */
+    const opus_int32     a32,               /* I    numerator (Q0)                  */
+    const opus_int32     b32,               /* I    denominator (Q0)                */
+    const opus_int       Qres               /* I    Q-domain of result (>= 0)       */
+)
+{
+    opus_int   a_headrm, b_headrm, lshift;
+    opus_int32 b32_inv, a32_nrm, b32_nrm, result;
+
+    silk_assert( b32 != 0 );
+    silk_assert( Qres >= 0 );
+
+    /* Compute number of bits head room and normalize inputs */
+    a_headrm = silk_CLZ32( silk_abs(a32) ) - 1;
+    a32_nrm = silk_LSHIFT(a32, a_headrm);                                       /* Q: a_headrm                  */
+    b_headrm = silk_CLZ32( silk_abs(b32) ) - 1;
+    b32_nrm = silk_LSHIFT(b32, b_headrm);                                       /* Q: b_headrm                  */
+
+    /* Inverse of b32, with 14 bits of precision */
+    b32_inv = silk_DIV32_16( silk_int32_MAX >> 2, silk_RSHIFT(b32_nrm, 16) );   /* Q: 29 + 16 - b_headrm        */
+
+    /* First approximation */
+    result = silk_SMULWB(a32_nrm, b32_inv);                                     /* Q: 29 + a_headrm - b_headrm  */
+
+    /* Compute residual by subtracting product of denominator and first approximation */
+    /* It's OK to overflow because the final value of a32_nrm should always be small */
+    a32_nrm = silk_SUB32_ovflw(a32_nrm, silk_LSHIFT_ovflw( silk_SMMUL(b32_nrm, result), 3 ));  /* Q: a_headrm   */
+
+    /* Refinement */
+    result = silk_SMLAWB(result, a32_nrm, b32_inv);                             /* Q: 29 + a_headrm - b_headrm  */
+
+    /* Convert to Qres domain */
+    lshift = 29 + a_headrm - b_headrm - Qres;
+    if( lshift < 0 ) {
+        return silk_LSHIFT_SAT32(result, -lshift);
+    } else {
+        if( lshift < 32){
+            return silk_RSHIFT(result, lshift);
+        } else {
+            /* Avoid undefined result */
+            return 0;
+        }
+    }
+}
+
+/* Invert int32 value and return result as int32 in a given Q-domain */
+static OPUS_INLINE opus_int32 silk_INVERSE32_varQ(   /* O    returns a good approximation of "(1 << Qres) / b32" */
+    const opus_int32     b32,                   /* I    denominator (Q0)                */
+    const opus_int       Qres                   /* I    Q-domain of result (> 0)        */
+)
+{
+    opus_int   b_headrm, lshift;
+    opus_int32 b32_inv, b32_nrm, err_Q32, result;
+
+    silk_assert( b32 != 0 );
+    silk_assert( Qres > 0 );
+
+    /* Compute number of bits head room and normalize input */
+    b_headrm = silk_CLZ32( silk_abs(b32) ) - 1;
+    b32_nrm = silk_LSHIFT(b32, b_headrm);                                       /* Q: b_headrm                */
+
+    /* Inverse of b32, with 14 bits of precision */
+    b32_inv = silk_DIV32_16( silk_int32_MAX >> 2, silk_RSHIFT(b32_nrm, 16) );   /* Q: 29 + 16 - b_headrm    */
+
+    /* First approximation */
+    result = silk_LSHIFT(b32_inv, 16);                                          /* Q: 61 - b_headrm            */
+
+    /* Compute residual by subtracting product of denominator and first approximation from one */
+    err_Q32 = silk_LSHIFT( ((opus_int32)1<<29) - silk_SMULWB(b32_nrm, b32_inv), 3 );        /* Q32                        */
+
+    /* Refinement */
+    result = silk_SMLAWW(result, err_Q32, b32_inv);                             /* Q: 61 - b_headrm            */
+
+    /* Convert to Qres domain */
+    lshift = 61 - b_headrm - Qres;
+    if( lshift <= 0 ) {
+        return silk_LSHIFT_SAT32(result, -lshift);
+    } else {
+        if( lshift < 32){
+            return silk_RSHIFT(result, lshift);
+        }else{
+            /* Avoid undefined result */
+            return 0;
+        }
+    }
+}
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* SILK_FIX_INLINES_H */
diff --git a/drivers/opus/silk/LPC_analysis_filter.c b/drivers/opus/silk/LPC_analysis_filter.c
new file mode 100644
index 0000000000..98ef509e4e
--- /dev/null
+++ b/drivers/opus/silk/LPC_analysis_filter.c
@@ -0,0 +1,106 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "celt_lpc.h"
+
+/*******************************************/
+/* LPC analysis filter                     */
+/* NB! State is kept internally and the    */
+/* filter always starts with zero state    */
+/* first d output samples are set to zero  */
+/*******************************************/
+
+void silk_LPC_analysis_filter(
+    opus_int16                  *out,               /* O    Output signal                                               */
+    const opus_int16            *in,                /* I    Input signal                                                */
+    const opus_int16            *B,                 /* I    MA prediction coefficients, Q12 [order]                     */
+    const opus_int32            len,                /* I    Signal length                                               */
+    const opus_int32            d                   /* I    Filter order                                                */
+)
+{
+    opus_int   j;
+#ifdef OPUS_FIXED_POINT
+    opus_int16 mem[SILK_MAX_ORDER_LPC];
+    opus_int16 num[SILK_MAX_ORDER_LPC];
+#else
+    int ix;
+    opus_int32       out32_Q12, out32;
+    const opus_int16 *in_ptr;
+#endif
+
+    silk_assert( d >= 6 );
+    silk_assert( (d & 1) == 0 );
+    silk_assert( d <= len );
+
+#ifdef OPUS_FIXED_POINT
+    silk_assert( d <= SILK_MAX_ORDER_LPC );
+    for ( j = 0; j < d; j++ ) {
+        num[ j ] = -B[ j ];
+    }
+    for (j=0;j<d;j++) {
+        mem[ j ] = in[ d - j - 1 ];
+    }
+    celt_fir( in + d, num, out + d, len - d, d, mem );
+    for ( j = 0; j < d; j++ ) {
+        out[ j ] = 0;
+    }
+#else
+    for( ix = d; ix < len; ix++ ) {
+        in_ptr = &in[ ix - 1 ];
+
+        out32_Q12 = silk_SMULBB( in_ptr[  0 ], B[ 0 ] );
+        /* Allowing wrap around so that two wraps can cancel each other. The rare
+           cases where the result wraps around can only be triggered by invalid streams*/
+        out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -1 ], B[ 1 ] );
+        out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -2 ], B[ 2 ] );
+        out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -3 ], B[ 3 ] );
+        out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -4 ], B[ 4 ] );
+        out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -5 ], B[ 5 ] );
+        for( j = 6; j < d; j += 2 ) {
+            out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -j     ], B[ j     ] );
+            out32_Q12 = silk_SMLABB_ovflw( out32_Q12, in_ptr[ -j - 1 ], B[ j + 1 ] );
+        }
+
+        /* Subtract prediction */
+        out32_Q12 = silk_SUB32_ovflw( silk_LSHIFT( (opus_int32)in_ptr[ 1 ], 12 ), out32_Q12 );
+
+        /* Scale to Q0 */
+        out32 = silk_RSHIFT_ROUND( out32_Q12, 12 );
+
+        /* Saturate output */
+        out[ ix ] = (opus_int16)silk_SAT16( out32 );
+    }
+
+    /* Set first d output samples to zero */
+    silk_memset( out, 0, d * sizeof( opus_int16 ) );
+#endif
+}
diff --git a/drivers/opus/silk/LPC_inv_pred_gain.c b/drivers/opus/silk/LPC_inv_pred_gain.c
new file mode 100644
index 0000000000..6dc9a49861
--- /dev/null
+++ b/drivers/opus/silk/LPC_inv_pred_gain.c
@@ -0,0 +1,154 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+#define QA                          24
+#define A_LIMIT                     SILK_FIX_CONST( 0.99975, QA )
+
+#define MUL32_FRAC_Q(a32, b32, Q)   ((opus_int32)(silk_RSHIFT_ROUND64(silk_SMULL(a32, b32), Q)))
+
+/* Compute inverse of LPC prediction gain, and                          */
+/* test if LPC coefficients are stable (all poles within unit circle)   */
+static opus_int32 LPC_inverse_pred_gain_QA(                 /* O   Returns inverse prediction gain in energy domain, Q30    */
+    opus_int32           A_QA[ 2 ][ SILK_MAX_ORDER_LPC ],   /* I   Prediction coefficients                                  */
+    const opus_int       order                              /* I   Prediction order                                         */
+)
+{
+    opus_int   k, n, mult2Q;
+    opus_int32 invGain_Q30, rc_Q31, rc_mult1_Q30, rc_mult2, tmp_QA;
+    opus_int32 *Aold_QA, *Anew_QA;
+
+    Anew_QA = A_QA[ order & 1 ];
+
+    invGain_Q30 = (opus_int32)1 << 30;
+    for( k = order - 1; k > 0; k-- ) {
+        /* Check for stability */
+        if( ( Anew_QA[ k ] > A_LIMIT ) || ( Anew_QA[ k ] < -A_LIMIT ) ) {
+            return 0;
+        }
+
+        /* Set RC equal to negated AR coef */
+        rc_Q31 = -silk_LSHIFT( Anew_QA[ k ], 31 - QA );
+
+        /* rc_mult1_Q30 range: [ 1 : 2^30 ] */
+        rc_mult1_Q30 = ( (opus_int32)1 << 30 ) - silk_SMMUL( rc_Q31, rc_Q31 );
+        silk_assert( rc_mult1_Q30 > ( 1 << 15 ) );                   /* reduce A_LIMIT if fails */
+        silk_assert( rc_mult1_Q30 <= ( 1 << 30 ) );
+
+        /* rc_mult2 range: [ 2^30 : silk_int32_MAX ] */
+        mult2Q = 32 - silk_CLZ32( silk_abs( rc_mult1_Q30 ) );
+        rc_mult2 = silk_INVERSE32_varQ( rc_mult1_Q30, mult2Q + 30 );
+
+        /* Update inverse gain */
+        /* invGain_Q30 range: [ 0 : 2^30 ] */
+        invGain_Q30 = silk_LSHIFT( silk_SMMUL( invGain_Q30, rc_mult1_Q30 ), 2 );
+        silk_assert( invGain_Q30 >= 0           );
+        silk_assert( invGain_Q30 <= ( 1 << 30 ) );
+
+        /* Swap pointers */
+        Aold_QA = Anew_QA;
+        Anew_QA = A_QA[ k & 1 ];
+
+        /* Update AR coefficient */
+        for( n = 0; n < k; n++ ) {
+            tmp_QA = Aold_QA[ n ] - MUL32_FRAC_Q( Aold_QA[ k - n - 1 ], rc_Q31, 31 );
+            Anew_QA[ n ] = MUL32_FRAC_Q( tmp_QA, rc_mult2 , mult2Q );
+        }
+    }
+
+    /* Check for stability */
+    if( ( Anew_QA[ 0 ] > A_LIMIT ) || ( Anew_QA[ 0 ] < -A_LIMIT ) ) {
+        return 0;
+    }
+
+    /* Set RC equal to negated AR coef */
+    rc_Q31 = -silk_LSHIFT( Anew_QA[ 0 ], 31 - QA );
+
+    /* Range: [ 1 : 2^30 ] */
+    rc_mult1_Q30 = ( (opus_int32)1 << 30 ) - silk_SMMUL( rc_Q31, rc_Q31 );
+
+    /* Update inverse gain */
+    /* Range: [ 0 : 2^30 ] */
+    invGain_Q30 = silk_LSHIFT( silk_SMMUL( invGain_Q30, rc_mult1_Q30 ), 2 );
+    silk_assert( invGain_Q30 >= 0     );
+    silk_assert( invGain_Q30 <= 1<<30 );
+
+    return invGain_Q30;
+}
+
+/* For input in Q12 domain */
+opus_int32 silk_LPC_inverse_pred_gain(              /* O   Returns inverse prediction gain in energy domain, Q30        */
+    const opus_int16            *A_Q12,             /* I   Prediction coefficients, Q12 [order]                         */
+    const opus_int              order               /* I   Prediction order                                             */
+)
+{
+    opus_int   k;
+    opus_int32 Atmp_QA[ 2 ][ SILK_MAX_ORDER_LPC ];
+    opus_int32 *Anew_QA;
+    opus_int32 DC_resp = 0;
+
+    Anew_QA = Atmp_QA[ order & 1 ];
+
+    /* Increase Q domain of the AR coefficients */
+    for( k = 0; k < order; k++ ) {
+        DC_resp += (opus_int32)A_Q12[ k ];
+        Anew_QA[ k ] = silk_LSHIFT32( (opus_int32)A_Q12[ k ], QA - 12 );
+    }
+    /* If the DC is unstable, we don't even need to do the full calculations */
+    if( DC_resp >= 4096 ) {
+        return 0;
+    }
+    return LPC_inverse_pred_gain_QA( Atmp_QA, order );
+}
+
+#ifdef OPUS_FIXED_POINT
+
+/* For input in Q24 domain */
+opus_int32 silk_LPC_inverse_pred_gain_Q24(          /* O    Returns inverse prediction gain in energy domain, Q30       */
+    const opus_int32            *A_Q24,             /* I    Prediction coefficients [order]                             */
+    const opus_int              order               /* I    Prediction order                                            */
+)
+{
+    opus_int   k;
+    opus_int32 Atmp_QA[ 2 ][ SILK_MAX_ORDER_LPC ];
+    opus_int32 *Anew_QA;
+
+    Anew_QA = Atmp_QA[ order & 1 ];
+
+    /* Increase Q domain of the AR coefficients */
+    for( k = 0; k < order; k++ ) {
+        Anew_QA[ k ] = silk_RSHIFT32( A_Q24[ k ], 24 - QA );
+    }
+
+    return LPC_inverse_pred_gain_QA( Atmp_QA, order );
+}
+#endif
diff --git a/drivers/opus/silk/LP_variable_cutoff.c b/drivers/opus/silk/LP_variable_cutoff.c
new file mode 100644
index 0000000000..098c19d34f
--- /dev/null
+++ b/drivers/opus/silk/LP_variable_cutoff.c
@@ -0,0 +1,135 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/*
+    Elliptic/Cauer filters designed with 0.1 dB passband ripple,
+    80 dB minimum stopband attenuation, and
+    [0.95 : 0.15 : 0.35] normalized cut off frequencies.
+*/
+
+#include "silk_main.h"
+
+/* Helper function, interpolates the filter taps */
+static OPUS_INLINE void silk_LP_interpolate_filter_taps(
+    opus_int32           B_Q28[ TRANSITION_NB ],
+    opus_int32           A_Q28[ TRANSITION_NA ],
+    const opus_int       ind,
+    const opus_int32     fac_Q16
+)
+{
+    opus_int nb, na;
+
+    if( ind < TRANSITION_INT_NUM - 1 ) {
+        if( fac_Q16 > 0 ) {
+            if( fac_Q16 < 32768 ) { /* fac_Q16 is in range of a 16-bit int */
+                /* Piece-wise linear interpolation of B and A */
+                for( nb = 0; nb < TRANSITION_NB; nb++ ) {
+                    B_Q28[ nb ] = silk_SMLAWB(
+                        silk_Transition_LP_B_Q28[ ind     ][ nb ],
+                        silk_Transition_LP_B_Q28[ ind + 1 ][ nb ] -
+                        silk_Transition_LP_B_Q28[ ind     ][ nb ],
+                        fac_Q16 );
+                }
+                for( na = 0; na < TRANSITION_NA; na++ ) {
+                    A_Q28[ na ] = silk_SMLAWB(
+                        silk_Transition_LP_A_Q28[ ind     ][ na ],
+                        silk_Transition_LP_A_Q28[ ind + 1 ][ na ] -
+                        silk_Transition_LP_A_Q28[ ind     ][ na ],
+                        fac_Q16 );
+                }
+            } else { /* ( fac_Q16 - ( 1 << 16 ) ) is in range of a 16-bit int */
+                silk_assert( fac_Q16 - ( 1 << 16 ) == silk_SAT16( fac_Q16 - ( 1 << 16 ) ) );
+                /* Piece-wise linear interpolation of B and A */
+                for( nb = 0; nb < TRANSITION_NB; nb++ ) {
+                    B_Q28[ nb ] = silk_SMLAWB(
+                        silk_Transition_LP_B_Q28[ ind + 1 ][ nb ],
+                        silk_Transition_LP_B_Q28[ ind + 1 ][ nb ] -
+                        silk_Transition_LP_B_Q28[ ind     ][ nb ],
+                        fac_Q16 - ( (opus_int32)1 << 16 ) );
+                }
+                for( na = 0; na < TRANSITION_NA; na++ ) {
+                    A_Q28[ na ] = silk_SMLAWB(
+                        silk_Transition_LP_A_Q28[ ind + 1 ][ na ],
+                        silk_Transition_LP_A_Q28[ ind + 1 ][ na ] -
+                        silk_Transition_LP_A_Q28[ ind     ][ na ],
+                        fac_Q16 - ( (opus_int32)1 << 16 ) );
+                }
+            }
+        } else {
+            silk_memcpy( B_Q28, silk_Transition_LP_B_Q28[ ind ], TRANSITION_NB * sizeof( opus_int32 ) );
+            silk_memcpy( A_Q28, silk_Transition_LP_A_Q28[ ind ], TRANSITION_NA * sizeof( opus_int32 ) );
+        }
+    } else {
+        silk_memcpy( B_Q28, silk_Transition_LP_B_Q28[ TRANSITION_INT_NUM - 1 ], TRANSITION_NB * sizeof( opus_int32 ) );
+        silk_memcpy( A_Q28, silk_Transition_LP_A_Q28[ TRANSITION_INT_NUM - 1 ], TRANSITION_NA * sizeof( opus_int32 ) );
+    }
+}
+
+/* Low-pass filter with variable cutoff frequency based on  */
+/* piece-wise linear interpolation between elliptic filters */
+/* Start by setting psEncC->mode <> 0;                      */
+/* Deactivate by setting psEncC->mode = 0;                  */
+void silk_LP_variable_cutoff(
+    silk_LP_state               *psLP,                          /* I/O  LP filter state                             */
+    opus_int16                  *frame,                         /* I/O  Low-pass filtered output signal             */
+    const opus_int              frame_length                    /* I    Frame length                                */
+)
+{
+    opus_int32   B_Q28[ TRANSITION_NB ], A_Q28[ TRANSITION_NA ], fac_Q16 = 0;
+    opus_int     ind = 0;
+
+    silk_assert( psLP->transition_frame_no >= 0 && psLP->transition_frame_no <= TRANSITION_FRAMES );
+
+    /* Run filter if needed */
+    if( psLP->mode != 0 ) {
+        /* Calculate index and interpolation factor for interpolation */
+#if( TRANSITION_INT_STEPS == 64 )
+        fac_Q16 = silk_LSHIFT( TRANSITION_FRAMES - psLP->transition_frame_no, 16 - 6 );
+#else
+        fac_Q16 = silk_DIV32_16( silk_LSHIFT( TRANSITION_FRAMES - psLP->transition_frame_no, 16 ), TRANSITION_FRAMES );
+#endif
+        ind      = silk_RSHIFT( fac_Q16, 16 );
+        fac_Q16 -= silk_LSHIFT( ind, 16 );
+
+        silk_assert( ind >= 0 );
+        silk_assert( ind < TRANSITION_INT_NUM );
+
+        /* Interpolate filter coefficients */
+        silk_LP_interpolate_filter_taps( B_Q28, A_Q28, ind, fac_Q16 );
+
+        /* Update transition frame number for next frame */
+        psLP->transition_frame_no = silk_LIMIT( psLP->transition_frame_no + psLP->mode, 0, TRANSITION_FRAMES );
+
+        /* ARMA low-pass filtering */
+        silk_assert( TRANSITION_NB == 3 && TRANSITION_NA == 2 );
+        silk_biquad_alt( frame, B_Q28, A_Q28, psLP->In_LP_State, frame, frame_length, 1);
+    }
+}
diff --git a/drivers/opus/silk/MacroCount.h b/drivers/opus/silk/MacroCount.h
new file mode 100644
index 0000000000..834817d058
--- /dev/null
+++ b/drivers/opus/silk/MacroCount.h
@@ -0,0 +1,718 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SIGPROCFIX_API_MACROCOUNT_H
+#define SIGPROCFIX_API_MACROCOUNT_H
+#include <stdio.h>
+
+#ifdef    silk_MACRO_COUNT
+#define varDefine opus_int64 ops_count = 0;
+
+extern opus_int64 ops_count;
+
+static OPUS_INLINE opus_int64 silk_SaveCount(){
+    return(ops_count);
+}
+
+static OPUS_INLINE opus_int64 silk_SaveResetCount(){
+    opus_int64 ret;
+
+    ret = ops_count;
+    ops_count = 0;
+    return(ret);
+}
+
+static OPUS_INLINE silk_PrintCount(){
+    printf("ops_count = %d \n ", (opus_int32)ops_count);
+}
+
+#undef silk_MUL
+static OPUS_INLINE opus_int32 silk_MUL(opus_int32 a32, opus_int32 b32){
+    opus_int32 ret;
+    ops_count += 4;
+    ret = a32 * b32;
+    return ret;
+}
+
+#undef silk_MUL_uint
+static OPUS_INLINE opus_uint32 silk_MUL_uint(opus_uint32 a32, opus_uint32 b32){
+    opus_uint32 ret;
+    ops_count += 4;
+    ret = a32 * b32;
+    return ret;
+}
+#undef silk_MLA
+static OPUS_INLINE opus_int32 silk_MLA(opus_int32 a32, opus_int32 b32, opus_int32 c32){
+    opus_int32 ret;
+    ops_count += 4;
+    ret = a32 + b32 * c32;
+    return ret;
+}
+
+#undef silk_MLA_uint
+static OPUS_INLINE opus_int32 silk_MLA_uint(opus_uint32 a32, opus_uint32 b32, opus_uint32 c32){
+    opus_uint32 ret;
+    ops_count += 4;
+    ret = a32 + b32 * c32;
+    return ret;
+}
+
+#undef silk_SMULWB
+static OPUS_INLINE opus_int32 silk_SMULWB(opus_int32 a32, opus_int32 b32){
+    opus_int32 ret;
+    ops_count += 5;
+    ret = (a32 >> 16) * (opus_int32)((opus_int16)b32) + (((a32 & 0x0000FFFF) * (opus_int32)((opus_int16)b32)) >> 16);
+    return ret;
+}
+#undef    silk_SMLAWB
+static OPUS_INLINE opus_int32 silk_SMLAWB(opus_int32 a32, opus_int32 b32, opus_int32 c32){
+    opus_int32 ret;
+    ops_count += 5;
+    ret = ((a32) + ((((b32) >> 16) * (opus_int32)((opus_int16)(c32))) + ((((b32) & 0x0000FFFF) * (opus_int32)((opus_int16)(c32))) >> 16)));
+    return ret;
+}
+
+#undef silk_SMULWT
+static OPUS_INLINE opus_int32 silk_SMULWT(opus_int32 a32, opus_int32 b32){
+    opus_int32 ret;
+    ops_count += 4;
+    ret = (a32 >> 16) * (b32 >> 16) + (((a32 & 0x0000FFFF) * (b32 >> 16)) >> 16);
+    return ret;
+}
+#undef silk_SMLAWT
+static OPUS_INLINE opus_int32 silk_SMLAWT(opus_int32 a32, opus_int32 b32, opus_int32 c32){
+    opus_int32 ret;
+    ops_count += 4;
+    ret = a32 + ((b32 >> 16) * (c32 >> 16)) + (((b32 & 0x0000FFFF) * ((c32 >> 16)) >> 16));
+    return ret;
+}
+
+#undef silk_SMULBB
+static OPUS_INLINE opus_int32 silk_SMULBB(opus_int32 a32, opus_int32 b32){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = (opus_int32)((opus_int16)a32) * (opus_int32)((opus_int16)b32);
+    return ret;
+}
+#undef silk_SMLABB
+static OPUS_INLINE opus_int32 silk_SMLABB(opus_int32 a32, opus_int32 b32, opus_int32 c32){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a32 + (opus_int32)((opus_int16)b32) * (opus_int32)((opus_int16)c32);
+    return ret;
+}
+
+#undef silk_SMULBT
+static OPUS_INLINE opus_int32 silk_SMULBT(opus_int32 a32, opus_int32 b32 ){
+    opus_int32 ret;
+    ops_count += 4;
+    ret = ((opus_int32)((opus_int16)a32)) * (b32 >> 16);
+    return ret;
+}
+
+#undef silk_SMLABT
+static OPUS_INLINE opus_int32 silk_SMLABT(opus_int32 a32, opus_int32 b32, opus_int32 c32){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a32 + ((opus_int32)((opus_int16)b32)) * (c32 >> 16);
+    return ret;
+}
+
+#undef silk_SMULTT
+static OPUS_INLINE opus_int32 silk_SMULTT(opus_int32 a32, opus_int32 b32){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = (a32 >> 16) * (b32 >> 16);
+    return ret;
+}
+
+#undef    silk_SMLATT
+static OPUS_INLINE opus_int32 silk_SMLATT(opus_int32 a32, opus_int32 b32, opus_int32 c32){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a32 + (b32 >> 16) * (c32 >> 16);
+    return ret;
+}
+
+
+/* multiply-accumulate macros that allow overflow in the addition (ie, no asserts in debug mode)*/
+#undef    silk_MLA_ovflw
+#define silk_MLA_ovflw silk_MLA
+
+#undef silk_SMLABB_ovflw
+#define silk_SMLABB_ovflw silk_SMLABB
+
+#undef silk_SMLABT_ovflw
+#define silk_SMLABT_ovflw silk_SMLABT
+
+#undef silk_SMLATT_ovflw
+#define silk_SMLATT_ovflw silk_SMLATT
+
+#undef silk_SMLAWB_ovflw
+#define silk_SMLAWB_ovflw silk_SMLAWB
+
+#undef silk_SMLAWT_ovflw
+#define silk_SMLAWT_ovflw silk_SMLAWT
+
+#undef silk_SMULL
+static OPUS_INLINE opus_int64 silk_SMULL(opus_int32 a32, opus_int32 b32){
+    opus_int64 ret;
+    ops_count += 8;
+    ret = ((opus_int64)(a32) * /*(opus_int64)*/(b32));
+    return ret;
+}
+
+#undef    silk_SMLAL
+static OPUS_INLINE opus_int64 silk_SMLAL(opus_int64 a64, opus_int32 b32, opus_int32 c32){
+    opus_int64 ret;
+    ops_count += 8;
+    ret = a64 + ((opus_int64)(b32) * /*(opus_int64)*/(c32));
+    return ret;
+}
+#undef    silk_SMLALBB
+static OPUS_INLINE opus_int64 silk_SMLALBB(opus_int64 a64, opus_int16 b16, opus_int16 c16){
+    opus_int64 ret;
+    ops_count += 4;
+    ret = a64 + ((opus_int64)(b16) * /*(opus_int64)*/(c16));
+    return ret;
+}
+
+#undef    SigProcFIX_CLZ16
+static OPUS_INLINE opus_int32 SigProcFIX_CLZ16(opus_int16 in16)
+{
+    opus_int32 out32 = 0;
+    ops_count += 10;
+    if( in16 == 0 ) {
+        return 16;
+    }
+    /* test nibbles */
+    if( in16 & 0xFF00 ) {
+        if( in16 & 0xF000 ) {
+            in16 >>= 12;
+        } else {
+            out32 += 4;
+            in16 >>= 8;
+        }
+    } else {
+        if( in16 & 0xFFF0 ) {
+            out32 += 8;
+            in16 >>= 4;
+        } else {
+            out32 += 12;
+        }
+    }
+    /* test bits and return */
+    if( in16 & 0xC ) {
+        if( in16 & 0x8 )
+            return out32 + 0;
+        else
+            return out32 + 1;
+    } else {
+        if( in16 & 0xE )
+            return out32 + 2;
+        else
+            return out32 + 3;
+    }
+}
+
+#undef SigProcFIX_CLZ32
+static OPUS_INLINE opus_int32 SigProcFIX_CLZ32(opus_int32 in32)
+{
+    /* test highest 16 bits and convert to opus_int16 */
+    ops_count += 2;
+    if( in32 & 0xFFFF0000 ) {
+        return SigProcFIX_CLZ16((opus_int16)(in32 >> 16));
+    } else {
+        return SigProcFIX_CLZ16((opus_int16)in32) + 16;
+    }
+}
+
+#undef silk_DIV32
+static OPUS_INLINE opus_int32 silk_DIV32(opus_int32 a32, opus_int32 b32){
+    ops_count += 64;
+    return a32 / b32;
+}
+
+#undef silk_DIV32_16
+static OPUS_INLINE opus_int32 silk_DIV32_16(opus_int32 a32, opus_int32 b32){
+    ops_count += 32;
+    return a32 / b32;
+}
+
+#undef silk_SAT8
+static OPUS_INLINE opus_int8 silk_SAT8(opus_int64 a){
+    opus_int8 tmp;
+    ops_count += 1;
+    tmp = (opus_int8)((a) > silk_int8_MAX ? silk_int8_MAX  : \
+                    ((a) < silk_int8_MIN ? silk_int8_MIN  : (a)));
+    return(tmp);
+}
+
+#undef silk_SAT16
+static OPUS_INLINE opus_int16 silk_SAT16(opus_int64 a){
+    opus_int16 tmp;
+    ops_count += 1;
+    tmp = (opus_int16)((a) > silk_int16_MAX ? silk_int16_MAX  : \
+                     ((a) < silk_int16_MIN ? silk_int16_MIN  : (a)));
+    return(tmp);
+}
+#undef silk_SAT32
+static OPUS_INLINE opus_int32 silk_SAT32(opus_int64 a){
+    opus_int32 tmp;
+    ops_count += 1;
+    tmp = (opus_int32)((a) > silk_int32_MAX ? silk_int32_MAX  : \
+                     ((a) < silk_int32_MIN ? silk_int32_MIN  : (a)));
+    return(tmp);
+}
+#undef silk_POS_SAT32
+static OPUS_INLINE opus_int32 silk_POS_SAT32(opus_int64 a){
+    opus_int32 tmp;
+    ops_count += 1;
+    tmp = (opus_int32)((a) > silk_int32_MAX ? silk_int32_MAX : (a));
+    return(tmp);
+}
+
+#undef silk_ADD_POS_SAT8
+static OPUS_INLINE opus_int8 silk_ADD_POS_SAT8(opus_int64 a, opus_int64 b){
+    opus_int8 tmp;
+    ops_count += 1;
+    tmp = (opus_int8)((((a)+(b)) & 0x80) ? silk_int8_MAX  : ((a)+(b)));
+    return(tmp);
+}
+#undef silk_ADD_POS_SAT16
+static OPUS_INLINE opus_int16 silk_ADD_POS_SAT16(opus_int64 a, opus_int64 b){
+    opus_int16 tmp;
+    ops_count += 1;
+    tmp = (opus_int16)((((a)+(b)) & 0x8000) ? silk_int16_MAX : ((a)+(b)));
+    return(tmp);
+}
+
+#undef silk_ADD_POS_SAT32
+static OPUS_INLINE opus_int32 silk_ADD_POS_SAT32(opus_int64 a, opus_int64 b){
+    opus_int32 tmp;
+    ops_count += 1;
+    tmp = (opus_int32)((((a)+(b)) & 0x80000000) ? silk_int32_MAX : ((a)+(b)));
+    return(tmp);
+}
+
+#undef silk_ADD_POS_SAT64
+static OPUS_INLINE opus_int64 silk_ADD_POS_SAT64(opus_int64 a, opus_int64 b){
+    opus_int64 tmp;
+    ops_count += 1;
+    tmp = ((((a)+(b)) & 0x8000000000000000LL) ? silk_int64_MAX : ((a)+(b)));
+    return(tmp);
+}
+
+#undef    silk_LSHIFT8
+static OPUS_INLINE opus_int8 silk_LSHIFT8(opus_int8 a, opus_int32 shift){
+    opus_int8 ret;
+    ops_count += 1;
+    ret = a << shift;
+    return ret;
+}
+#undef    silk_LSHIFT16
+static OPUS_INLINE opus_int16 silk_LSHIFT16(opus_int16 a, opus_int32 shift){
+    opus_int16 ret;
+    ops_count += 1;
+    ret = a << shift;
+    return ret;
+}
+#undef    silk_LSHIFT32
+static OPUS_INLINE opus_int32 silk_LSHIFT32(opus_int32 a, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a << shift;
+    return ret;
+}
+#undef    silk_LSHIFT64
+static OPUS_INLINE opus_int64 silk_LSHIFT64(opus_int64 a, opus_int shift){
+    ops_count += 1;
+    return a << shift;
+}
+
+#undef    silk_LSHIFT_ovflw
+static OPUS_INLINE opus_int32 silk_LSHIFT_ovflw(opus_int32 a, opus_int32 shift){
+    ops_count += 1;
+    return a << shift;
+}
+
+#undef    silk_LSHIFT_uint
+static OPUS_INLINE opus_uint32 silk_LSHIFT_uint(opus_uint32 a, opus_int32 shift){
+    opus_uint32 ret;
+    ops_count += 1;
+    ret = a << shift;
+    return ret;
+}
+
+#undef    silk_RSHIFT8
+static OPUS_INLINE opus_int8 silk_RSHIFT8(opus_int8 a, opus_int32 shift){
+    ops_count += 1;
+    return a >> shift;
+}
+#undef    silk_RSHIFT16
+static OPUS_INLINE opus_int16 silk_RSHIFT16(opus_int16 a, opus_int32 shift){
+    ops_count += 1;
+    return a >> shift;
+}
+#undef    silk_RSHIFT32
+static OPUS_INLINE opus_int32 silk_RSHIFT32(opus_int32 a, opus_int32 shift){
+    ops_count += 1;
+    return a >> shift;
+}
+#undef    silk_RSHIFT64
+static OPUS_INLINE opus_int64 silk_RSHIFT64(opus_int64 a, opus_int64 shift){
+    ops_count += 1;
+    return a >> shift;
+}
+
+#undef    silk_RSHIFT_uint
+static OPUS_INLINE opus_uint32 silk_RSHIFT_uint(opus_uint32 a, opus_int32 shift){
+    ops_count += 1;
+    return a >> shift;
+}
+
+#undef    silk_ADD_LSHIFT
+static OPUS_INLINE opus_int32 silk_ADD_LSHIFT(opus_int32 a, opus_int32 b, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a + (b << shift);
+    return ret;                /* shift >= 0*/
+}
+#undef    silk_ADD_LSHIFT32
+static OPUS_INLINE opus_int32 silk_ADD_LSHIFT32(opus_int32 a, opus_int32 b, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a + (b << shift);
+    return ret;                /* shift >= 0*/
+}
+#undef    silk_ADD_LSHIFT_uint
+static OPUS_INLINE opus_uint32 silk_ADD_LSHIFT_uint(opus_uint32 a, opus_uint32 b, opus_int32 shift){
+    opus_uint32 ret;
+    ops_count += 1;
+    ret = a + (b << shift);
+    return ret;                /* shift >= 0*/
+}
+#undef    silk_ADD_RSHIFT
+static OPUS_INLINE opus_int32 silk_ADD_RSHIFT(opus_int32 a, opus_int32 b, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a + (b >> shift);
+    return ret;                /* shift  > 0*/
+}
+#undef    silk_ADD_RSHIFT32
+static OPUS_INLINE opus_int32 silk_ADD_RSHIFT32(opus_int32 a, opus_int32 b, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a + (b >> shift);
+    return ret;                /* shift  > 0*/
+}
+#undef    silk_ADD_RSHIFT_uint
+static OPUS_INLINE opus_uint32 silk_ADD_RSHIFT_uint(opus_uint32 a, opus_uint32 b, opus_int32 shift){
+    opus_uint32 ret;
+    ops_count += 1;
+    ret = a + (b >> shift);
+    return ret;                /* shift  > 0*/
+}
+#undef    silk_SUB_LSHIFT32
+static OPUS_INLINE opus_int32 silk_SUB_LSHIFT32(opus_int32 a, opus_int32 b, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a - (b << shift);
+    return ret;                /* shift >= 0*/
+}
+#undef    silk_SUB_RSHIFT32
+static OPUS_INLINE opus_int32 silk_SUB_RSHIFT32(opus_int32 a, opus_int32 b, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a - (b >> shift);
+    return ret;                /* shift  > 0*/
+}
+
+#undef    silk_RSHIFT_ROUND
+static OPUS_INLINE opus_int32 silk_RSHIFT_ROUND(opus_int32 a, opus_int32 shift){
+    opus_int32 ret;
+    ops_count += 3;
+    ret = shift == 1 ? (a >> 1) + (a & 1) : ((a >> (shift - 1)) + 1) >> 1;
+    return ret;
+}
+
+#undef    silk_RSHIFT_ROUND64
+static OPUS_INLINE opus_int64 silk_RSHIFT_ROUND64(opus_int64 a, opus_int32 shift){
+    opus_int64 ret;
+    ops_count += 6;
+    ret = shift == 1 ? (a >> 1) + (a & 1) : ((a >> (shift - 1)) + 1) >> 1;
+    return ret;
+}
+
+#undef    silk_abs_int64
+static OPUS_INLINE opus_int64 silk_abs_int64(opus_int64 a){
+    ops_count += 1;
+    return (((a) >  0)  ? (a) : -(a));            /* Be careful, silk_abs returns wrong when input equals to silk_intXX_MIN*/
+}
+
+#undef    silk_abs_int32
+static OPUS_INLINE opus_int32 silk_abs_int32(opus_int32 a){
+    ops_count += 1;
+    return silk_abs(a);
+}
+
+
+#undef silk_min
+static silk_min(a, b){
+    ops_count += 1;
+    return (((a) < (b)) ? (a) :  (b));
+}
+#undef silk_max
+static silk_max(a, b){
+    ops_count += 1;
+    return (((a) > (b)) ? (a) :  (b));
+}
+#undef silk_sign
+static silk_sign(a){
+    ops_count += 1;
+    return ((a) > 0 ? 1 : ( (a) < 0 ? -1 : 0 ));
+}
+
+#undef    silk_ADD16
+static OPUS_INLINE opus_int16 silk_ADD16(opus_int16 a, opus_int16 b){
+    opus_int16 ret;
+    ops_count += 1;
+    ret = a + b;
+    return ret;
+}
+
+#undef    silk_ADD32
+static OPUS_INLINE opus_int32 silk_ADD32(opus_int32 a, opus_int32 b){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a + b;
+    return ret;
+}
+
+#undef    silk_ADD64
+static OPUS_INLINE opus_int64 silk_ADD64(opus_int64 a, opus_int64 b){
+    opus_int64 ret;
+    ops_count += 2;
+    ret = a + b;
+    return ret;
+}
+
+#undef    silk_SUB16
+static OPUS_INLINE opus_int16 silk_SUB16(opus_int16 a, opus_int16 b){
+    opus_int16 ret;
+    ops_count += 1;
+    ret = a - b;
+    return ret;
+}
+
+#undef    silk_SUB32
+static OPUS_INLINE opus_int32 silk_SUB32(opus_int32 a, opus_int32 b){
+    opus_int32 ret;
+    ops_count += 1;
+    ret = a - b;
+    return ret;
+}
+
+#undef    silk_SUB64
+static OPUS_INLINE opus_int64 silk_SUB64(opus_int64 a, opus_int64 b){
+    opus_int64 ret;
+    ops_count += 2;
+    ret = a - b;
+    return ret;
+}
+
+#undef silk_ADD_SAT16
+static OPUS_INLINE opus_int16 silk_ADD_SAT16( opus_int16 a16, opus_int16 b16 ) {
+    opus_int16 res;
+    /* Nb will be counted in AKP_add32 and silk_SAT16*/
+    res = (opus_int16)silk_SAT16( silk_ADD32( (opus_int32)(a16), (b16) ) );
+    return res;
+}
+
+#undef silk_ADD_SAT32
+static OPUS_INLINE opus_int32 silk_ADD_SAT32(opus_int32 a32, opus_int32 b32){
+    opus_int32 res;
+    ops_count += 1;
+    res =    ((((a32) + (b32)) & 0x80000000) == 0 ?                                    \
+            ((((a32) & (b32)) & 0x80000000) != 0 ? silk_int32_MIN : (a32)+(b32)) :    \
+            ((((a32) | (b32)) & 0x80000000) == 0 ? silk_int32_MAX : (a32)+(b32)) );
+    return res;
+}
+
+#undef silk_ADD_SAT64
+static OPUS_INLINE opus_int64 silk_ADD_SAT64( opus_int64 a64, opus_int64 b64 ) {
+    opus_int64 res;
+    ops_count += 1;
+    res =    ((((a64) + (b64)) & 0x8000000000000000LL) == 0 ?                                \
+            ((((a64) & (b64)) & 0x8000000000000000LL) != 0 ? silk_int64_MIN : (a64)+(b64)) :    \
+            ((((a64) | (b64)) & 0x8000000000000000LL) == 0 ? silk_int64_MAX : (a64)+(b64)) );
+    return res;
+}
+
+#undef silk_SUB_SAT16
+static OPUS_INLINE opus_int16 silk_SUB_SAT16( opus_int16 a16, opus_int16 b16 ) {
+    opus_int16 res;
+    silk_assert(0);
+    /* Nb will be counted in sub-macros*/
+    res = (opus_int16)silk_SAT16( silk_SUB32( (opus_int32)(a16), (b16) ) );
+    return res;
+}
+
+#undef silk_SUB_SAT32
+static OPUS_INLINE opus_int32 silk_SUB_SAT32( opus_int32 a32, opus_int32 b32 ) {
+    opus_int32 res;
+    ops_count += 1;
+    res =     ((((a32)-(b32)) & 0x80000000) == 0 ?                                            \
+            (( (a32) & ((b32)^0x80000000) & 0x80000000) ? silk_int32_MIN : (a32)-(b32)) :    \
+            ((((a32)^0x80000000) & (b32)  & 0x80000000) ? silk_int32_MAX : (a32)-(b32)) );
+    return res;
+}
+
+#undef silk_SUB_SAT64
+static OPUS_INLINE opus_int64 silk_SUB_SAT64( opus_int64 a64, opus_int64 b64 ) {
+    opus_int64 res;
+    ops_count += 1;
+    res =    ((((a64)-(b64)) & 0x8000000000000000LL) == 0 ?                                                        \
+            (( (a64) & ((b64)^0x8000000000000000LL) & 0x8000000000000000LL) ? silk_int64_MIN : (a64)-(b64)) :    \
+            ((((a64)^0x8000000000000000LL) & (b64)  & 0x8000000000000000LL) ? silk_int64_MAX : (a64)-(b64)) );
+
+    return res;
+}
+
+#undef    silk_SMULWW
+static OPUS_INLINE opus_int32 silk_SMULWW(opus_int32 a32, opus_int32 b32){
+    opus_int32 ret;
+    /* Nb will be counted in sub-macros*/
+    ret = silk_MLA(silk_SMULWB((a32), (b32)), (a32), silk_RSHIFT_ROUND((b32), 16));
+    return ret;
+}
+
+#undef    silk_SMLAWW
+static OPUS_INLINE opus_int32 silk_SMLAWW(opus_int32 a32, opus_int32 b32, opus_int32 c32){
+    opus_int32 ret;
+    /* Nb will be counted in sub-macros*/
+    ret = silk_MLA(silk_SMLAWB((a32), (b32), (c32)), (b32), silk_RSHIFT_ROUND((c32), 16));
+    return ret;
+}
+
+#undef    silk_min_int
+static OPUS_INLINE opus_int silk_min_int(opus_int a, opus_int b)
+{
+    ops_count += 1;
+    return (((a) < (b)) ? (a) : (b));
+}
+
+#undef    silk_min_16
+static OPUS_INLINE opus_int16 silk_min_16(opus_int16 a, opus_int16 b)
+{
+    ops_count += 1;
+    return (((a) < (b)) ? (a) : (b));
+}
+#undef    silk_min_32
+static OPUS_INLINE opus_int32 silk_min_32(opus_int32 a, opus_int32 b)
+{
+    ops_count += 1;
+    return (((a) < (b)) ? (a) : (b));
+}
+#undef    silk_min_64
+static OPUS_INLINE opus_int64 silk_min_64(opus_int64 a, opus_int64 b)
+{
+    ops_count += 1;
+    return (((a) < (b)) ? (a) : (b));
+}
+
+/* silk_min() versions with typecast in the function call */
+#undef    silk_max_int
+static OPUS_INLINE opus_int silk_max_int(opus_int a, opus_int b)
+{
+    ops_count += 1;
+    return (((a) > (b)) ? (a) : (b));
+}
+#undef    silk_max_16
+static OPUS_INLINE opus_int16 silk_max_16(opus_int16 a, opus_int16 b)
+{
+    ops_count += 1;
+    return (((a) > (b)) ? (a) : (b));
+}
+#undef    silk_max_32
+static OPUS_INLINE opus_int32 silk_max_32(opus_int32 a, opus_int32 b)
+{
+    ops_count += 1;
+    return (((a) > (b)) ? (a) : (b));
+}
+
+#undef    silk_max_64
+static OPUS_INLINE opus_int64 silk_max_64(opus_int64 a, opus_int64 b)
+{
+    ops_count += 1;
+    return (((a) > (b)) ? (a) : (b));
+}
+
+
+#undef silk_LIMIT_int
+static OPUS_INLINE opus_int silk_LIMIT_int(opus_int a, opus_int limit1, opus_int limit2)
+{
+    opus_int ret;
+    ops_count += 6;
+
+    ret = ((limit1) > (limit2) ? ((a) > (limit1) ? (limit1) : ((a) < (limit2) ? (limit2) : (a))) \
+        : ((a) > (limit2) ? (limit2) : ((a) < (limit1) ? (limit1) : (a))));
+
+    return(ret);
+}
+
+#undef silk_LIMIT_16
+static OPUS_INLINE opus_int16 silk_LIMIT_16(opus_int16 a, opus_int16 limit1, opus_int16 limit2)
+{
+    opus_int16 ret;
+    ops_count += 6;
+
+    ret = ((limit1) > (limit2) ? ((a) > (limit1) ? (limit1) : ((a) < (limit2) ? (limit2) : (a))) \
+        : ((a) > (limit2) ? (limit2) : ((a) < (limit1) ? (limit1) : (a))));
+
+return(ret);
+}
+
+
+#undef silk_LIMIT_32
+static OPUS_INLINE opus_int silk_LIMIT_32(opus_int32 a, opus_int32 limit1, opus_int32 limit2)
+{
+    opus_int32 ret;
+    ops_count += 6;
+
+    ret = ((limit1) > (limit2) ? ((a) > (limit1) ? (limit1) : ((a) < (limit2) ? (limit2) : (a))) \
+        : ((a) > (limit2) ? (limit2) : ((a) < (limit1) ? (limit1) : (a))));
+    return(ret);
+}
+
+#else
+#define varDefine
+#define silk_SaveCount()
+
+#endif
+#endif
+
diff --git a/drivers/opus/silk/MacroDebug.h b/drivers/opus/silk/MacroDebug.h
new file mode 100644
index 0000000000..35aedc5c5f
--- /dev/null
+++ b/drivers/opus/silk/MacroDebug.h
@@ -0,0 +1,952 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Copyright (C) 2012 Xiph.Org Foundation
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef MACRO_DEBUG_H
+#define MACRO_DEBUG_H
+
+/* Redefine macro functions with extensive assertion in DEBUG mode.
+   As functions can't be undefined, this file can't work with SigProcFIX_MacroCount.h */
+
+#if ( defined (FIXED_DEBUG) || ( 0 && defined (_DEBUG) ) ) && !defined (silk_MACRO_COUNT)
+
+#undef silk_ADD16
+#define silk_ADD16(a,b) silk_ADD16_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int16 silk_ADD16_(opus_int16 a, opus_int16 b, char *file, int line){
+    opus_int16 ret;
+
+    ret = a + b;
+    if ( ret != silk_ADD_SAT16( a, b ) )
+    {
+        fprintf (stderr, "silk_ADD16(%d, %d) in %s: line %d\n", a, b, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_ADD32
+#define silk_ADD32(a,b) silk_ADD32_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_ADD32_(opus_int32 a, opus_int32 b, char *file, int line){
+    opus_int32 ret;
+
+    ret = a + b;
+    if ( ret != silk_ADD_SAT32( a, b ) )
+    {
+        fprintf (stderr, "silk_ADD32(%d, %d) in %s: line %d\n", a, b, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_ADD64
+#define silk_ADD64(a,b) silk_ADD64_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_ADD64_(opus_int64 a, opus_int64 b, char *file, int line){
+    opus_int64 ret;
+
+    ret = a + b;
+    if ( ret != silk_ADD_SAT64( a, b ) )
+    {
+        fprintf (stderr, "silk_ADD64(%lld, %lld) in %s: line %d\n", (long long)a, (long long)b, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SUB16
+#define silk_SUB16(a,b) silk_SUB16_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int16 silk_SUB16_(opus_int16 a, opus_int16 b, char *file, int line){
+    opus_int16 ret;
+
+    ret = a - b;
+    if ( ret != silk_SUB_SAT16( a, b ) )
+    {
+        fprintf (stderr, "silk_SUB16(%d, %d) in %s: line %d\n", a, b, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SUB32
+#define silk_SUB32(a,b) silk_SUB32_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SUB32_(opus_int32 a, opus_int32 b, char *file, int line){
+    opus_int32 ret;
+
+    ret = a - b;
+    if ( ret != silk_SUB_SAT32( a, b ) )
+    {
+        fprintf (stderr, "silk_SUB32(%d, %d) in %s: line %d\n", a, b, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SUB64
+#define silk_SUB64(a,b) silk_SUB64_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_SUB64_(opus_int64 a, opus_int64 b, char *file, int line){
+    opus_int64 ret;
+
+    ret = a - b;
+    if ( ret != silk_SUB_SAT64( a, b ) )
+    {
+        fprintf (stderr, "silk_SUB64(%lld, %lld) in %s: line %d\n", (long long)a, (long long)b, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_ADD_SAT16
+#define silk_ADD_SAT16(a,b) silk_ADD_SAT16_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int16 silk_ADD_SAT16_( opus_int16 a16, opus_int16 b16, char *file, int line) {
+    opus_int16 res;
+    res = (opus_int16)silk_SAT16( silk_ADD32( (opus_int32)(a16), (b16) ) );
+    if ( res != silk_SAT16( (opus_int32)a16 + (opus_int32)b16 ) )
+    {
+        fprintf (stderr, "silk_ADD_SAT16(%d, %d) in %s: line %d\n", a16, b16, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return res;
+}
+
+#undef silk_ADD_SAT32
+#define silk_ADD_SAT32(a,b) silk_ADD_SAT32_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_ADD_SAT32_(opus_int32 a32, opus_int32 b32, char *file, int line){
+    opus_int32 res;
+    res =   ((((opus_uint32)(a32) + (opus_uint32)(b32)) & 0x80000000) == 0 ?       \
+            ((((a32) & (b32)) & 0x80000000) != 0 ? silk_int32_MIN : (a32)+(b32)) : \
+            ((((a32) | (b32)) & 0x80000000) == 0 ? silk_int32_MAX : (a32)+(b32)) );
+    if ( res != silk_SAT32( (opus_int64)a32 + (opus_int64)b32 ) )
+    {
+        fprintf (stderr, "silk_ADD_SAT32(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return res;
+}
+
+#undef silk_ADD_SAT64
+#define silk_ADD_SAT64(a,b) silk_ADD_SAT64_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_ADD_SAT64_( opus_int64 a64, opus_int64 b64, char *file, int line) {
+    opus_int64 res;
+    int        fail = 0;
+    res =   ((((a64) + (b64)) & 0x8000000000000000LL) == 0 ?                                 \
+            ((((a64) & (b64)) & 0x8000000000000000LL) != 0 ? silk_int64_MIN : (a64)+(b64)) : \
+            ((((a64) | (b64)) & 0x8000000000000000LL) == 0 ? silk_int64_MAX : (a64)+(b64)) );
+    if( res != a64 + b64 ) {
+        /* Check that we saturated to the correct extreme value */
+        if ( !(( res == silk_int64_MAX && ( ( a64 >> 1 ) + ( b64 >> 1 ) > ( silk_int64_MAX >> 3 ) ) ) ||
+               ( res == silk_int64_MIN && ( ( a64 >> 1 ) + ( b64 >> 1 ) < ( silk_int64_MIN >> 3 ) ) ) ) )
+        {
+            fail = 1;
+        }
+    } else {
+        /* Saturation not necessary */
+        fail = res != a64 + b64;
+    }
+    if ( fail )
+    {
+        fprintf (stderr, "silk_ADD_SAT64(%lld, %lld) in %s: line %d\n", (long long)a64, (long long)b64, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return res;
+}
+
+#undef silk_SUB_SAT16
+#define silk_SUB_SAT16(a,b) silk_SUB_SAT16_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int16 silk_SUB_SAT16_( opus_int16 a16, opus_int16 b16, char *file, int line ) {
+    opus_int16 res;
+    res = (opus_int16)silk_SAT16( silk_SUB32( (opus_int32)(a16), (b16) ) );
+    if ( res != silk_SAT16( (opus_int32)a16 - (opus_int32)b16 ) )
+    {
+        fprintf (stderr, "silk_SUB_SAT16(%d, %d) in %s: line %d\n", a16, b16, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return res;
+}
+
+#undef silk_SUB_SAT32
+#define silk_SUB_SAT32(a,b) silk_SUB_SAT32_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SUB_SAT32_( opus_int32 a32, opus_int32 b32, char *file, int line ) {
+    opus_int32 res;
+    res =   ((((opus_uint32)(a32)-(opus_uint32)(b32)) & 0x80000000) == 0 ?                \
+            (( (a32) & ((b32)^0x80000000) & 0x80000000) ? silk_int32_MIN : (a32)-(b32)) : \
+            ((((a32)^0x80000000) & (b32)  & 0x80000000) ? silk_int32_MAX : (a32)-(b32)) );
+    if ( res != silk_SAT32( (opus_int64)a32 - (opus_int64)b32 ) )
+    {
+        fprintf (stderr, "silk_SUB_SAT32(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return res;
+}
+
+#undef silk_SUB_SAT64
+#define silk_SUB_SAT64(a,b) silk_SUB_SAT64_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_SUB_SAT64_( opus_int64 a64, opus_int64 b64, char *file, int line ) {
+    opus_int64 res;
+    int        fail = 0;
+    res =   ((((a64)-(b64)) & 0x8000000000000000LL) == 0 ?                                                    \
+            (( (a64) & ((b64)^0x8000000000000000LL) & 0x8000000000000000LL) ? silk_int64_MIN : (a64)-(b64)) : \
+            ((((a64)^0x8000000000000000LL) & (b64)  & 0x8000000000000000LL) ? silk_int64_MAX : (a64)-(b64)) );
+    if( res != a64 - b64 ) {
+        /* Check that we saturated to the correct extreme value */
+        if( !(( res == silk_int64_MAX && ( ( a64 >> 1 ) + ( b64 >> 1 ) > ( silk_int64_MAX >> 3 ) ) ) ||
+              ( res == silk_int64_MIN && ( ( a64 >> 1 ) + ( b64 >> 1 ) < ( silk_int64_MIN >> 3 ) ) ) ))
+        {
+            fail = 1;
+        }
+    } else {
+        /* Saturation not necessary */
+        fail = res != a64 - b64;
+    }
+    if ( fail )
+    {
+        fprintf (stderr, "silk_SUB_SAT64(%lld, %lld) in %s: line %d\n", (long long)a64, (long long)b64, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return res;
+}
+
+#undef silk_MUL
+#define silk_MUL(a,b) silk_MUL_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_MUL_(opus_int32 a32, opus_int32 b32, char *file, int line){
+    opus_int32 ret;
+    opus_int64 ret64;
+    ret = a32 * b32;
+    ret64 = (opus_int64)a32 * (opus_int64)b32;
+    if ( (opus_int64)ret != ret64 )
+    {
+        fprintf (stderr, "silk_MUL(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_MUL_uint
+#define silk_MUL_uint(a,b) silk_MUL_uint_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_uint32 silk_MUL_uint_(opus_uint32 a32, opus_uint32 b32, char *file, int line){
+    opus_uint32 ret;
+    ret = a32 * b32;
+    if ( (opus_uint64)ret != (opus_uint64)a32 * (opus_uint64)b32 )
+    {
+        fprintf (stderr, "silk_MUL_uint(%u, %u) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_MLA
+#define silk_MLA(a,b,c) silk_MLA_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_MLA_(opus_int32 a32, opus_int32 b32, opus_int32 c32, char *file, int line){
+    opus_int32 ret;
+    ret = a32 + b32 * c32;
+    if ( (opus_int64)ret != (opus_int64)a32 + (opus_int64)b32 * (opus_int64)c32 )
+    {
+        fprintf (stderr, "silk_MLA(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_MLA_uint
+#define silk_MLA_uint(a,b,c) silk_MLA_uint_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_MLA_uint_(opus_uint32 a32, opus_uint32 b32, opus_uint32 c32, char *file, int line){
+    opus_uint32 ret;
+    ret = a32 + b32 * c32;
+    if ( (opus_int64)ret != (opus_int64)a32 + (opus_int64)b32 * (opus_int64)c32 )
+    {
+        fprintf (stderr, "silk_MLA_uint(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SMULWB
+#define silk_SMULWB(a,b) silk_SMULWB_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMULWB_(opus_int32 a32, opus_int32 b32, char *file, int line){
+    opus_int32 ret;
+    ret = (a32 >> 16) * (opus_int32)((opus_int16)b32) + (((a32 & 0x0000FFFF) * (opus_int32)((opus_int16)b32)) >> 16);
+    if ( (opus_int64)ret != ((opus_int64)a32 * (opus_int16)b32) >> 16 )
+    {
+        fprintf (stderr, "silk_SMULWB(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SMLAWB
+#define silk_SMLAWB(a,b,c) silk_SMLAWB_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMLAWB_(opus_int32 a32, opus_int32 b32, opus_int32 c32, char *file, int line){
+    opus_int32 ret;
+    ret = silk_ADD32( a32, silk_SMULWB( b32, c32 ) );
+    if ( silk_ADD32( a32, silk_SMULWB( b32, c32 ) ) != silk_ADD_SAT32( a32, silk_SMULWB( b32, c32 ) ) )
+    {
+        fprintf (stderr, "silk_SMLAWB(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SMULWT
+#define silk_SMULWT(a,b) silk_SMULWT_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMULWT_(opus_int32 a32, opus_int32 b32, char *file, int line){
+    opus_int32 ret;
+    ret = (a32 >> 16) * (b32 >> 16) + (((a32 & 0x0000FFFF) * (b32 >> 16)) >> 16);
+    if ( (opus_int64)ret != ((opus_int64)a32 * (b32 >> 16)) >> 16 )
+    {
+        fprintf (stderr, "silk_SMULWT(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SMLAWT
+#define silk_SMLAWT(a,b,c) silk_SMLAWT_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMLAWT_(opus_int32 a32, opus_int32 b32, opus_int32 c32, char *file, int line){
+    opus_int32 ret;
+    ret = a32 + ((b32 >> 16) * (c32 >> 16)) + (((b32 & 0x0000FFFF) * ((c32 >> 16)) >> 16));
+    if ( (opus_int64)ret != (opus_int64)a32 + (((opus_int64)b32 * (c32 >> 16)) >> 16) )
+    {
+        fprintf (stderr, "silk_SMLAWT(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SMULL
+#define silk_SMULL(a,b) silk_SMULL_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_SMULL_(opus_int64 a64, opus_int64 b64, char *file, int line){
+    opus_int64 ret64;
+    int        fail = 0;
+    ret64 = a64 * b64;
+    if( b64 != 0 ) {
+        fail = a64 != (ret64 / b64);
+    } else if( a64 != 0 ) {
+        fail = b64 != (ret64 / a64);
+    }
+    if ( fail )
+    {
+        fprintf (stderr, "silk_SMULL(%lld, %lld) in %s: line %d\n", (long long)a64, (long long)b64, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret64;
+}
+
+/* no checking needed for silk_SMULBB */
+#undef silk_SMLABB
+#define silk_SMLABB(a,b,c) silk_SMLABB_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMLABB_(opus_int32 a32, opus_int32 b32, opus_int32 c32, char *file, int line){
+    opus_int32 ret;
+    ret = a32 + (opus_int32)((opus_int16)b32) * (opus_int32)((opus_int16)c32);
+    if ( (opus_int64)ret != (opus_int64)a32 + (opus_int64)b32 * (opus_int16)c32 )
+    {
+        fprintf (stderr, "silk_SMLABB(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+/* no checking needed for silk_SMULBT */
+#undef silk_SMLABT
+#define silk_SMLABT(a,b,c) silk_SMLABT_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMLABT_(opus_int32 a32, opus_int32 b32, opus_int32 c32, char *file, int line){
+    opus_int32 ret;
+    ret = a32 + ((opus_int32)((opus_int16)b32)) * (c32 >> 16);
+    if ( (opus_int64)ret != (opus_int64)a32 + (opus_int64)b32 * (c32 >> 16) )
+    {
+        fprintf (stderr, "silk_SMLABT(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+/* no checking needed for silk_SMULTT */
+#undef silk_SMLATT
+#define silk_SMLATT(a,b,c) silk_SMLATT_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMLATT_(opus_int32 a32, opus_int32 b32, opus_int32 c32, char *file, int line){
+    opus_int32 ret;
+    ret = a32 + (b32 >> 16) * (c32 >> 16);
+    if ( (opus_int64)ret != (opus_int64)a32 + (b32 >> 16) * (c32 >> 16) )
+    {
+        fprintf (stderr, "silk_SMLATT(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_SMULWW
+#define silk_SMULWW(a,b) silk_SMULWW_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMULWW_(opus_int32 a32, opus_int32 b32, char *file, int line){
+    opus_int32 ret, tmp1, tmp2;
+    opus_int64 ret64;
+    int        fail = 0;
+
+    ret  = silk_SMULWB( a32, b32 );
+    tmp1 = silk_RSHIFT_ROUND( b32, 16 );
+    tmp2 = silk_MUL( a32, tmp1 );
+
+    fail |= (opus_int64)tmp2 != (opus_int64) a32 * (opus_int64) tmp1;
+
+    tmp1 = ret;
+    ret  = silk_ADD32( tmp1, tmp2 );
+    fail |= silk_ADD32( tmp1, tmp2 ) != silk_ADD_SAT32( tmp1, tmp2 );
+
+    ret64 = silk_RSHIFT64( silk_SMULL( a32, b32 ), 16 );
+    fail |= (opus_int64)ret != ret64;
+
+    if ( fail )
+    {
+        fprintf (stderr, "silk_SMULWT(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+
+    return ret;
+}
+
+#undef silk_SMLAWW
+#define silk_SMLAWW(a,b,c) silk_SMLAWW_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SMLAWW_(opus_int32 a32, opus_int32 b32, opus_int32 c32, char *file, int line){
+    opus_int32 ret, tmp;
+
+    tmp = silk_SMULWW( b32, c32 );
+    ret = silk_ADD32( a32, tmp );
+    if ( ret != silk_ADD_SAT32( a32, tmp ) )
+    {
+        fprintf (stderr, "silk_SMLAWW(%d, %d, %d) in %s: line %d\n", a32, b32, c32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+/* Multiply-accumulate macros that allow overflow in the addition (ie, no asserts in debug mode) */
+#undef  silk_MLA_ovflw
+#define silk_MLA_ovflw(a32, b32, c32)    ((a32) + ((b32) * (c32)))
+#undef  silk_SMLABB_ovflw
+#define silk_SMLABB_ovflw(a32, b32, c32)    ((a32) + ((opus_int32)((opus_int16)(b32))) * (opus_int32)((opus_int16)(c32)))
+
+/* no checking needed for silk_SMULL
+   no checking needed for silk_SMLAL
+   no checking needed for silk_SMLALBB
+   no checking needed for SigProcFIX_CLZ16
+   no checking needed for SigProcFIX_CLZ32*/
+
+#undef silk_DIV32
+#define silk_DIV32(a,b) silk_DIV32_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_DIV32_(opus_int32 a32, opus_int32 b32, char *file, int line){
+    if ( b32 == 0 )
+    {
+        fprintf (stderr, "silk_DIV32(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a32 / b32;
+}
+
+#undef silk_DIV32_16
+#define silk_DIV32_16(a,b) silk_DIV32_16_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_DIV32_16_(opus_int32 a32, opus_int32 b32, char *file, int line){
+    int fail = 0;
+    fail |= b32 == 0;
+    fail |= b32 > silk_int16_MAX;
+    fail |= b32 < silk_int16_MIN;
+    if ( fail )
+    {
+        fprintf (stderr, "silk_DIV32_16(%d, %d) in %s: line %d\n", a32, b32, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a32 / b32;
+}
+
+/* no checking needed for silk_SAT8
+   no checking needed for silk_SAT16
+   no checking needed for silk_SAT32
+   no checking needed for silk_POS_SAT32
+   no checking needed for silk_ADD_POS_SAT8
+   no checking needed for silk_ADD_POS_SAT16
+   no checking needed for silk_ADD_POS_SAT32
+   no checking needed for silk_ADD_POS_SAT64 */
+
+#undef silk_LSHIFT8
+#define silk_LSHIFT8(a,b) silk_LSHIFT8_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int8 silk_LSHIFT8_(opus_int8 a, opus_int32 shift, char *file, int line){
+    opus_int8 ret;
+    int       fail = 0;
+    ret = a << shift;
+    fail |= shift < 0;
+    fail |= shift >= 8;
+    fail |= (opus_int64)ret != ((opus_int64)a) << shift;
+    if ( fail )
+    {
+        fprintf (stderr, "silk_LSHIFT8(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_LSHIFT16
+#define silk_LSHIFT16(a,b) silk_LSHIFT16_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int16 silk_LSHIFT16_(opus_int16 a, opus_int32 shift, char *file, int line){
+    opus_int16 ret;
+    int        fail = 0;
+    ret = a << shift;
+    fail |= shift < 0;
+    fail |= shift >= 16;
+    fail |= (opus_int64)ret != ((opus_int64)a) << shift;
+    if ( fail )
+    {
+        fprintf (stderr, "silk_LSHIFT16(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_LSHIFT32
+#define silk_LSHIFT32(a,b) silk_LSHIFT32_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_LSHIFT32_(opus_int32 a, opus_int32 shift, char *file, int line){
+    opus_int32 ret;
+    int        fail = 0;
+    ret = a << shift;
+    fail |= shift < 0;
+    fail |= shift >= 32;
+    fail |= (opus_int64)ret != ((opus_int64)a) << shift;
+    if ( fail )
+    {
+        fprintf (stderr, "silk_LSHIFT32(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_LSHIFT64
+#define silk_LSHIFT64(a,b) silk_LSHIFT64_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_LSHIFT64_(opus_int64 a, opus_int shift, char *file, int line){
+    opus_int64 ret;
+    int        fail = 0;
+    ret = a << shift;
+    fail |= shift < 0;
+    fail |= shift >= 64;
+    fail |= (ret>>shift) != ((opus_int64)a);
+    if ( fail )
+    {
+        fprintf (stderr, "silk_LSHIFT64(%lld, %d) in %s: line %d\n", (long long)a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_LSHIFT_ovflw
+#define silk_LSHIFT_ovflw(a,b) silk_LSHIFT_ovflw_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_LSHIFT_ovflw_(opus_int32 a, opus_int32 shift, char *file, int line){
+    if ( (shift < 0) || (shift >= 32) ) /* no check for overflow */
+    {
+        fprintf (stderr, "silk_LSHIFT_ovflw(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a << shift;
+}
+
+#undef silk_LSHIFT_uint
+#define silk_LSHIFT_uint(a,b) silk_LSHIFT_uint_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_uint32 silk_LSHIFT_uint_(opus_uint32 a, opus_int32 shift, char *file, int line){
+    opus_uint32 ret;
+    ret = a << shift;
+    if ( (shift < 0) || ((opus_int64)ret != ((opus_int64)a) << shift))
+    {
+        fprintf (stderr, "silk_LSHIFT_uint(%u, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_RSHIFT8
+#define silk_RSHITF8(a,b) silk_RSHIFT8_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int8 silk_RSHIFT8_(opus_int8 a, opus_int32 shift, char *file, int line){
+    if ( (shift < 0) || (shift>=8) )
+    {
+        fprintf (stderr, "silk_RSHITF8(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a >> shift;
+}
+
+#undef silk_RSHIFT16
+#define silk_RSHITF16(a,b) silk_RSHIFT16_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int16 silk_RSHIFT16_(opus_int16 a, opus_int32 shift, char *file, int line){
+    if ( (shift < 0) || (shift>=16) )
+    {
+        fprintf (stderr, "silk_RSHITF16(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a >> shift;
+}
+
+#undef silk_RSHIFT32
+#define silk_RSHIFT32(a,b) silk_RSHIFT32_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_RSHIFT32_(opus_int32 a, opus_int32 shift, char *file, int line){
+    if ( (shift < 0) || (shift>=32) )
+    {
+        fprintf (stderr, "silk_RSHITF32(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a >> shift;
+}
+
+#undef silk_RSHIFT64
+#define silk_RSHIFT64(a,b) silk_RSHIFT64_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_RSHIFT64_(opus_int64 a, opus_int64 shift, char *file, int line){
+    if ( (shift < 0) || (shift>=64) )
+    {
+        fprintf (stderr, "silk_RSHITF64(%lld, %lld) in %s: line %d\n", (long long)a, (long long)shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a >> shift;
+}
+
+#undef silk_RSHIFT_uint
+#define silk_RSHIFT_uint(a,b) silk_RSHIFT_uint_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_uint32 silk_RSHIFT_uint_(opus_uint32 a, opus_int32 shift, char *file, int line){
+    if ( (shift < 0) || (shift>32) )
+    {
+        fprintf (stderr, "silk_RSHIFT_uint(%u, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return a >> shift;
+}
+
+#undef silk_ADD_LSHIFT
+#define silk_ADD_LSHIFT(a,b,c) silk_ADD_LSHIFT_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE int silk_ADD_LSHIFT_(int a, int b, int shift, char *file, int line){
+    opus_int16 ret;
+    ret = a + (b << shift);
+    if ( (shift < 0) || (shift>15) || ((opus_int64)ret != (opus_int64)a + (((opus_int64)b) << shift)) )
+    {
+        fprintf (stderr, "silk_ADD_LSHIFT(%d, %d, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift >= 0 */
+}
+
+#undef silk_ADD_LSHIFT32
+#define silk_ADD_LSHIFT32(a,b,c) silk_ADD_LSHIFT32_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_ADD_LSHIFT32_(opus_int32 a, opus_int32 b, opus_int32 shift, char *file, int line){
+    opus_int32 ret;
+    ret = a + (b << shift);
+    if ( (shift < 0) || (shift>31) || ((opus_int64)ret != (opus_int64)a + (((opus_int64)b) << shift)) )
+    {
+        fprintf (stderr, "silk_ADD_LSHIFT32(%d, %d, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift >= 0 */
+}
+
+#undef silk_ADD_LSHIFT_uint
+#define silk_ADD_LSHIFT_uint(a,b,c) silk_ADD_LSHIFT_uint_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_uint32 silk_ADD_LSHIFT_uint_(opus_uint32 a, opus_uint32 b, opus_int32 shift, char *file, int line){
+    opus_uint32 ret;
+    ret = a + (b << shift);
+    if ( (shift < 0) || (shift>32) || ((opus_int64)ret != (opus_int64)a + (((opus_int64)b) << shift)) )
+    {
+        fprintf (stderr, "silk_ADD_LSHIFT_uint(%u, %u, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift >= 0 */
+}
+
+#undef silk_ADD_RSHIFT
+#define silk_ADD_RSHIFT(a,b,c) silk_ADD_RSHIFT_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE int silk_ADD_RSHIFT_(int a, int b, int shift, char *file, int line){
+    opus_int16 ret;
+    ret = a + (b >> shift);
+    if ( (shift < 0) || (shift>15) || ((opus_int64)ret != (opus_int64)a + (((opus_int64)b) >> shift)) )
+    {
+        fprintf (stderr, "silk_ADD_RSHIFT(%d, %d, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift  > 0 */
+}
+
+#undef silk_ADD_RSHIFT32
+#define silk_ADD_RSHIFT32(a,b,c) silk_ADD_RSHIFT32_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_ADD_RSHIFT32_(opus_int32 a, opus_int32 b, opus_int32 shift, char *file, int line){
+    opus_int32 ret;
+    ret = a + (b >> shift);
+    if ( (shift < 0) || (shift>31) || ((opus_int64)ret != (opus_int64)a + (((opus_int64)b) >> shift)) )
+    {
+        fprintf (stderr, "silk_ADD_RSHIFT32(%d, %d, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift  > 0 */
+}
+
+#undef silk_ADD_RSHIFT_uint
+#define silk_ADD_RSHIFT_uint(a,b,c) silk_ADD_RSHIFT_uint_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_uint32 silk_ADD_RSHIFT_uint_(opus_uint32 a, opus_uint32 b, opus_int32 shift, char *file, int line){
+    opus_uint32 ret;
+    ret = a + (b >> shift);
+    if ( (shift < 0) || (shift>32) || ((opus_int64)ret != (opus_int64)a + (((opus_int64)b) >> shift)) )
+    {
+        fprintf (stderr, "silk_ADD_RSHIFT_uint(%u, %u, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift  > 0 */
+}
+
+#undef silk_SUB_LSHIFT32
+#define silk_SUB_LSHIFT32(a,b,c) silk_SUB_LSHIFT32_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SUB_LSHIFT32_(opus_int32 a, opus_int32 b, opus_int32 shift, char *file, int line){
+    opus_int32 ret;
+    ret = a - (b << shift);
+    if ( (shift < 0) || (shift>31) || ((opus_int64)ret != (opus_int64)a - (((opus_int64)b) << shift)) )
+    {
+        fprintf (stderr, "silk_SUB_LSHIFT32(%d, %d, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift >= 0 */
+}
+
+#undef silk_SUB_RSHIFT32
+#define silk_SUB_RSHIFT32(a,b,c) silk_SUB_RSHIFT32_((a), (b), (c), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_SUB_RSHIFT32_(opus_int32 a, opus_int32 b, opus_int32 shift, char *file, int line){
+    opus_int32 ret;
+    ret = a - (b >> shift);
+    if ( (shift < 0) || (shift>31) || ((opus_int64)ret != (opus_int64)a - (((opus_int64)b) >> shift)) )
+    {
+        fprintf (stderr, "silk_SUB_RSHIFT32(%d, %d, %d) in %s: line %d\n", a, b, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;                /* shift  > 0 */
+}
+
+#undef silk_RSHIFT_ROUND
+#define silk_RSHIFT_ROUND(a,b) silk_RSHIFT_ROUND_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_RSHIFT_ROUND_(opus_int32 a, opus_int32 shift, char *file, int line){
+    opus_int32 ret;
+    ret = shift == 1 ? (a >> 1) + (a & 1) : ((a >> (shift - 1)) + 1) >> 1;
+    /* the marco definition can't handle a shift of zero */
+    if ( (shift <= 0) || (shift>31) || ((opus_int64)ret != ((opus_int64)a + ((opus_int64)1 << (shift - 1))) >> shift) )
+    {
+        fprintf (stderr, "silk_RSHIFT_ROUND(%d, %d) in %s: line %d\n", a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return ret;
+}
+
+#undef silk_RSHIFT_ROUND64
+#define silk_RSHIFT_ROUND64(a,b) silk_RSHIFT_ROUND64_((a), (b), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_RSHIFT_ROUND64_(opus_int64 a, opus_int32 shift, char *file, int line){
+    opus_int64 ret;
+    /* the marco definition can't handle a shift of zero */
+    if ( (shift <= 0) || (shift>=64) )
+    {
+        fprintf (stderr, "silk_RSHIFT_ROUND64(%lld, %d) in %s: line %d\n", (long long)a, shift, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    ret = shift == 1 ? (a >> 1) + (a & 1) : ((a >> (shift - 1)) + 1) >> 1;
+    return ret;
+}
+
+/* silk_abs is used on floats also, so doesn't work... */
+/*#undef silk_abs
+static OPUS_INLINE opus_int32 silk_abs(opus_int32 a){
+    silk_assert(a != 0x80000000);
+    return (((a) >  0)  ? (a) : -(a));            // Be careful, silk_abs returns wrong when input equals to silk_intXX_MIN
+}*/
+
+#undef silk_abs_int64
+#define silk_abs_int64(a) silk_abs_int64_((a), __FILE__, __LINE__)
+static OPUS_INLINE opus_int64 silk_abs_int64_(opus_int64 a, char *file, int line){
+    if ( a == silk_int64_MIN )
+    {
+        fprintf (stderr, "silk_abs_int64(%lld) in %s: line %d\n", (long long)a, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return (((a) >  0)  ? (a) : -(a));            /* Be careful, silk_abs returns wrong when input equals to silk_intXX_MIN */
+}
+
+#undef silk_abs_int32
+#define silk_abs_int32(a) silk_abs_int32_((a), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_abs_int32_(opus_int32 a, char *file, int line){
+    if ( a == silk_int32_MIN )
+    {
+        fprintf (stderr, "silk_abs_int32(%d) in %s: line %d\n", a, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return silk_abs(a);
+}
+
+#undef silk_CHECK_FIT8
+#define silk_CHECK_FIT8(a) silk_CHECK_FIT8_((a), __FILE__, __LINE__)
+static OPUS_INLINE opus_int8 silk_CHECK_FIT8_( opus_int64 a, char *file, int line ){
+    opus_int8 ret;
+    ret = (opus_int8)a;
+    if ( (opus_int64)ret != a )
+    {
+        fprintf (stderr, "silk_CHECK_FIT8(%lld) in %s: line %d\n", (long long)a, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return( ret );
+}
+
+#undef silk_CHECK_FIT16
+#define silk_CHECK_FIT16(a) silk_CHECK_FIT16_((a), __FILE__, __LINE__)
+static OPUS_INLINE opus_int16 silk_CHECK_FIT16_( opus_int64 a, char *file, int line ){
+    opus_int16 ret;
+    ret = (opus_int16)a;
+    if ( (opus_int64)ret != a )
+    {
+        fprintf (stderr, "silk_CHECK_FIT16(%lld) in %s: line %d\n", (long long)a, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return( ret );
+}
+
+#undef silk_CHECK_FIT32
+#define silk_CHECK_FIT32(a) silk_CHECK_FIT32_((a), __FILE__, __LINE__)
+static OPUS_INLINE opus_int32 silk_CHECK_FIT32_( opus_int64 a, char *file, int line ){
+    opus_int32 ret;
+    ret = (opus_int32)a;
+    if ( (opus_int64)ret != a )
+    {
+        fprintf (stderr, "silk_CHECK_FIT32(%lld) in %s: line %d\n", (long long)a, file, line);
+#ifdef FIXED_DEBUG_ASSERT
+        silk_assert( 0 );
+#endif
+    }
+    return( ret );
+}
+
+/* no checking for silk_NSHIFT_MUL_32_32
+   no checking for silk_NSHIFT_MUL_16_16
+   no checking needed for silk_min
+   no checking needed for silk_max
+   no checking needed for silk_sign
+*/
+
+#endif
+#endif /* MACRO_DEBUG_H */
diff --git a/drivers/opus/silk/NLSF2A.c b/drivers/opus/silk/NLSF2A.c
new file mode 100644
index 0000000000..2b6f685f49
--- /dev/null
+++ b/drivers/opus/silk/NLSF2A.c
@@ -0,0 +1,178 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/* conversion between prediction filter coefficients and LSFs   */
+/* order should be even                                         */
+/* a piecewise linear approximation maps LSF <-> cos(LSF)       */
+/* therefore the result is not accurate LSFs, but the two       */
+/* functions are accurate inverses of each other                */
+
+#include "SigProc_FIX.h"
+#include "tables.h"
+
+#define QA      16
+
+/* helper function for NLSF2A(..) */
+static OPUS_INLINE void silk_NLSF2A_find_poly(
+    opus_int32          *out,      /* O    intermediate polynomial, QA [dd+1]        */
+    const opus_int32    *cLSF,     /* I    vector of interleaved 2*cos(LSFs), QA [d] */
+    opus_int            dd         /* I    polynomial order (= 1/2 * filter order)   */
+)
+{
+    opus_int   k, n;
+    opus_int32 ftmp;
+
+    out[0] = silk_LSHIFT( 1, QA );
+    out[1] = -cLSF[0];
+    for( k = 1; k < dd; k++ ) {
+        ftmp = cLSF[2*k];            /* QA*/
+        out[k+1] = silk_LSHIFT( out[k-1], 1 ) - (opus_int32)silk_RSHIFT_ROUND64( silk_SMULL( ftmp, out[k] ), QA );
+        for( n = k; n > 1; n-- ) {
+            out[n] += out[n-2] - (opus_int32)silk_RSHIFT_ROUND64( silk_SMULL( ftmp, out[n-1] ), QA );
+        }
+        out[1] -= ftmp;
+    }
+}
+
+/* compute whitening filter coefficients from normalized line spectral frequencies */
+void silk_NLSF2A(
+    opus_int16                  *a_Q12,             /* O    monic whitening filter coefficients in Q12,  [ d ]          */
+    const opus_int16            *NLSF,              /* I    normalized line spectral frequencies in Q15, [ d ]          */
+    const opus_int              d                   /* I    filter order (should be even)                               */
+)
+{
+    /* This ordering was found to maximize quality. It improves numerical accuracy of
+       silk_NLSF2A_find_poly() compared to "standard" ordering. */
+    static const unsigned char ordering16[16] = {
+      0, 15, 8, 7, 4, 11, 12, 3, 2, 13, 10, 5, 6, 9, 14, 1
+    };
+    static const unsigned char ordering10[10] = {
+      0, 9, 6, 3, 4, 5, 8, 1, 2, 7
+    };
+    const unsigned char *ordering;
+    opus_int   k, i, dd;
+    opus_int32 cos_LSF_QA[ SILK_MAX_ORDER_LPC ];
+    opus_int32 P[ SILK_MAX_ORDER_LPC / 2 + 1 ], Q[ SILK_MAX_ORDER_LPC / 2 + 1 ];
+    opus_int32 Ptmp, Qtmp, f_int, f_frac, cos_val, delta;
+    opus_int32 a32_QA1[ SILK_MAX_ORDER_LPC ];
+    opus_int32 maxabs, absval, idx=0, sc_Q16;
+
+    silk_assert( LSF_COS_TAB_SZ_FIX == 128 );
+    silk_assert( d==10||d==16 );
+
+    /* convert LSFs to 2*cos(LSF), using piecewise linear curve from table */
+    ordering = d == 16 ? ordering16 : ordering10;
+    for( k = 0; k < d; k++ ) {
+        silk_assert(NLSF[k] >= 0 );
+
+        /* f_int on a scale 0-127 (rounded down) */
+        f_int = silk_RSHIFT( NLSF[k], 15 - 7 );
+
+        /* f_frac, range: 0..255 */
+        f_frac = NLSF[k] - silk_LSHIFT( f_int, 15 - 7 );
+
+        silk_assert(f_int >= 0);
+        silk_assert(f_int < LSF_COS_TAB_SZ_FIX );
+
+        /* Read start and end value from table */
+        cos_val = silk_LSFCosTab_FIX_Q12[ f_int ];                /* Q12 */
+        delta   = silk_LSFCosTab_FIX_Q12[ f_int + 1 ] - cos_val;  /* Q12, with a range of 0..200 */
+
+        /* Linear interpolation */
+        cos_LSF_QA[ordering[k]] = silk_RSHIFT_ROUND( silk_LSHIFT( cos_val, 8 ) + silk_MUL( delta, f_frac ), 20 - QA ); /* QA */
+    }
+
+    dd = silk_RSHIFT( d, 1 );
+
+    /* generate even and odd polynomials using convolution */
+    silk_NLSF2A_find_poly( P, &cos_LSF_QA[ 0 ], dd );
+    silk_NLSF2A_find_poly( Q, &cos_LSF_QA[ 1 ], dd );
+
+    /* convert even and odd polynomials to opus_int32 Q12 filter coefs */
+    for( k = 0; k < dd; k++ ) {
+        Ptmp = P[ k+1 ] + P[ k ];
+        Qtmp = Q[ k+1 ] - Q[ k ];
+
+        /* the Ptmp and Qtmp values at this stage need to fit in int32 */
+        a32_QA1[ k ]     = -Qtmp - Ptmp;        /* QA+1 */
+        a32_QA1[ d-k-1 ] =  Qtmp - Ptmp;        /* QA+1 */
+    }
+
+    /* Limit the maximum absolute value of the prediction coefficients, so that they'll fit in int16 */
+    for( i = 0; i < 10; i++ ) {
+        /* Find maximum absolute value and its index */
+        maxabs = 0;
+        for( k = 0; k < d; k++ ) {
+            absval = silk_abs( a32_QA1[k] );
+            if( absval > maxabs ) {
+                maxabs = absval;
+                idx    = k;
+            }
+        }
+        maxabs = silk_RSHIFT_ROUND( maxabs, QA + 1 - 12 );                                          /* QA+1 -> Q12 */
+
+        if( maxabs > silk_int16_MAX ) {
+            /* Reduce magnitude of prediction coefficients */
+            maxabs = silk_min( maxabs, 163838 );  /* ( silk_int32_MAX >> 14 ) + silk_int16_MAX = 163838 */
+            sc_Q16 = SILK_FIX_CONST( 0.999, 16 ) - silk_DIV32( silk_LSHIFT( maxabs - silk_int16_MAX, 14 ),
+                                        silk_RSHIFT32( silk_MUL( maxabs, idx + 1), 2 ) );
+            silk_bwexpander_32( a32_QA1, d, sc_Q16 );
+        } else {
+            break;
+        }
+    }
+
+    if( i == 10 ) {
+        /* Reached the last iteration, clip the coefficients */
+        for( k = 0; k < d; k++ ) {
+            a_Q12[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( a32_QA1[ k ], QA + 1 - 12 ) );  /* QA+1 -> Q12 */
+            a32_QA1[ k ] = silk_LSHIFT( (opus_int32)a_Q12[ k ], QA + 1 - 12 );
+        }
+    } else {
+        for( k = 0; k < d; k++ ) {
+            a_Q12[ k ] = (opus_int16)silk_RSHIFT_ROUND( a32_QA1[ k ], QA + 1 - 12 );                /* QA+1 -> Q12 */
+        }
+    }
+
+    for( i = 0; i < MAX_LPC_STABILIZE_ITERATIONS; i++ ) {
+        if( silk_LPC_inverse_pred_gain( a_Q12, d ) < SILK_FIX_CONST( 1.0 / MAX_PREDICTION_POWER_GAIN, 30 ) ) {
+            /* Prediction coefficients are (too close to) unstable; apply bandwidth expansion   */
+            /* on the unscaled coefficients, convert to Q12 and measure again                   */
+            silk_bwexpander_32( a32_QA1, d, 65536 - silk_LSHIFT( 2, i ) );
+            for( k = 0; k < d; k++ ) {
+                a_Q12[ k ] = (opus_int16)silk_RSHIFT_ROUND( a32_QA1[ k ], QA + 1 - 12 );            /* QA+1 -> Q12 */
+            }
+        } else {
+            break;
+        }
+    }
+}
+
diff --git a/drivers/opus/silk/NLSF_VQ.c b/drivers/opus/silk/NLSF_VQ.c
new file mode 100644
index 0000000000..e4ca79fbfe
--- /dev/null
+++ b/drivers/opus/silk/NLSF_VQ.c
@@ -0,0 +1,68 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
+void silk_NLSF_VQ(
+    opus_int32                  err_Q26[],                      /* O    Quantization errors [K]                     */
+    const opus_int16            in_Q15[],                       /* I    Input vectors to be quantized [LPC_order]   */
+    const opus_uint8            pCB_Q8[],                       /* I    Codebook vectors [K*LPC_order]              */
+    const opus_int              K,                              /* I    Number of codebook vectors                  */
+    const opus_int              LPC_order                       /* I    Number of LPCs                              */
+)
+{
+    opus_int        i, m;
+    opus_int32      diff_Q15, sum_error_Q30, sum_error_Q26;
+
+    silk_assert( LPC_order <= 16 );
+    silk_assert( ( LPC_order & 1 ) == 0 );
+
+    /* Loop over codebook */
+    for( i = 0; i < K; i++ ) {
+        sum_error_Q26 = 0;
+        for( m = 0; m < LPC_order; m += 2 ) {
+            /* Compute weighted squared quantization error for index m */
+            diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
+            sum_error_Q30 = silk_SMULBB( diff_Q15, diff_Q15 );
+
+            /* Compute weighted squared quantization error for index m + 1 */
+            diff_Q15 = silk_SUB_LSHIFT32( in_Q15[m + 1], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
+            sum_error_Q30 = silk_SMLABB( sum_error_Q30, diff_Q15, diff_Q15 );
+
+            sum_error_Q26 = silk_ADD_RSHIFT32( sum_error_Q26, sum_error_Q30, 4 );
+
+            silk_assert( sum_error_Q26 >= 0 );
+            silk_assert( sum_error_Q30 >= 0 );
+        }
+        err_Q26[ i ] = sum_error_Q26;
+    }
+}
diff --git a/drivers/opus/silk/NLSF_VQ_weights_laroia.c b/drivers/opus/silk/NLSF_VQ_weights_laroia.c
new file mode 100644
index 0000000000..f461ba01c0
--- /dev/null
+++ b/drivers/opus/silk/NLSF_VQ_weights_laroia.c
@@ -0,0 +1,80 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "define.h"
+#include "SigProc_FIX.h"
+
+/*
+R. Laroia, N. Phamdo and N. Farvardin, "Robust and Efficient Quantization of Speech LSP
+Parameters Using Structured Vector Quantization", Proc. IEEE Int. Conf. Acoust., Speech,
+Signal Processing, pp. 641-644, 1991.
+*/
+
+/* Laroia low complexity NLSF weights */
+void silk_NLSF_VQ_weights_laroia(
+    opus_int16                  *pNLSFW_Q_OUT,      /* O     Pointer to input vector weights [D]                        */
+    const opus_int16            *pNLSF_Q15,         /* I     Pointer to input vector         [D]                        */
+    const opus_int              D                   /* I     Input vector dimension (even)                              */
+)
+{
+    opus_int   k;
+    opus_int32 tmp1_int, tmp2_int;
+
+    silk_assert( D > 0 );
+    silk_assert( ( D & 1 ) == 0 );
+
+    /* First value */
+    tmp1_int = silk_max_int( pNLSF_Q15[ 0 ], 1 );
+    tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
+    tmp2_int = silk_max_int( pNLSF_Q15[ 1 ] - pNLSF_Q15[ 0 ], 1 );
+    tmp2_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp2_int );
+    pNLSFW_Q_OUT[ 0 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
+    silk_assert( pNLSFW_Q_OUT[ 0 ] > 0 );
+
+    /* Main loop */
+    for( k = 1; k < D - 1; k += 2 ) {
+        tmp1_int = silk_max_int( pNLSF_Q15[ k + 1 ] - pNLSF_Q15[ k ], 1 );
+        tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
+        pNLSFW_Q_OUT[ k ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
+        silk_assert( pNLSFW_Q_OUT[ k ] > 0 );
+
+        tmp2_int = silk_max_int( pNLSF_Q15[ k + 2 ] - pNLSF_Q15[ k + 1 ], 1 );
+        tmp2_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp2_int );
+        pNLSFW_Q_OUT[ k + 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
+        silk_assert( pNLSFW_Q_OUT[ k + 1 ] > 0 );
+    }
+
+    /* Last value */
+    tmp1_int = silk_max_int( ( 1 << 15 ) - pNLSF_Q15[ D - 1 ], 1 );
+    tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
+    pNLSFW_Q_OUT[ D - 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
+    silk_assert( pNLSFW_Q_OUT[ D - 1 ] > 0 );
+}
diff --git a/drivers/opus/silk/NLSF_decode.c b/drivers/opus/silk/NLSF_decode.c
new file mode 100644
index 0000000000..786a62d278
--- /dev/null
+++ b/drivers/opus/silk/NLSF_decode.c
@@ -0,0 +1,101 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Predictive dequantizer for NLSF residuals */
+static OPUS_INLINE void silk_NLSF_residual_dequant(               /* O    Returns RD value in Q30                     */
+          opus_int16         x_Q10[],                        /* O    Output [ order ]                            */
+    const opus_int8          indices[],                      /* I    Quantization indices [ order ]              */
+    const opus_uint8         pred_coef_Q8[],                 /* I    Backward predictor coefs [ order ]          */
+    const opus_int           quant_step_size_Q16,            /* I    Quantization step size                      */
+    const opus_int16         order                           /* I    Number of input values                      */
+)
+{
+    opus_int     i, out_Q10, pred_Q10;
+
+    out_Q10 = 0;
+    for( i = order-1; i >= 0; i-- ) {
+        pred_Q10 = silk_RSHIFT( silk_SMULBB( out_Q10, (opus_int16)pred_coef_Q8[ i ] ), 8 );
+        out_Q10  = silk_LSHIFT( indices[ i ], 10 );
+        if( out_Q10 > 0 ) {
+            out_Q10 = silk_SUB16( out_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+        } else if( out_Q10 < 0 ) {
+            out_Q10 = silk_ADD16( out_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+        }
+        out_Q10  = silk_SMLAWB( pred_Q10, (opus_int32)out_Q10, quant_step_size_Q16 );
+        x_Q10[ i ] = out_Q10;
+    }
+}
+
+
+/***********************/
+/* NLSF vector decoder */
+/***********************/
+void silk_NLSF_decode(
+          opus_int16            *pNLSF_Q15,                     /* O    Quantized NLSF vector [ LPC_ORDER ]         */
+          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
+    const silk_NLSF_CB_struct   *psNLSF_CB                      /* I    Codebook object                             */
+)
+{
+    opus_int         i;
+    opus_uint8       pred_Q8[  MAX_LPC_ORDER ];
+    opus_int16       ec_ix[    MAX_LPC_ORDER ];
+    opus_int16       res_Q10[  MAX_LPC_ORDER ];
+    opus_int16       W_tmp_QW[ MAX_LPC_ORDER ];
+    opus_int32       W_tmp_Q9, NLSF_Q15_tmp;
+    const opus_uint8 *pCB_element;
+
+    /* Decode first stage */
+    pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
+    for( i = 0; i < psNLSF_CB->order; i++ ) {
+        pNLSF_Q15[ i ] = silk_LSHIFT( (opus_int16)pCB_element[ i ], 7 );
+    }
+
+    /* Unpack entropy table indices and predictor for current CB1 index */
+    silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, NLSFIndices[ 0 ] );
+
+    /* Predictive residual dequantizer */
+    silk_NLSF_residual_dequant( res_Q10, &NLSFIndices[ 1 ], pred_Q8, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->order );
+
+    /* Weights from codebook vector */
+    silk_NLSF_VQ_weights_laroia( W_tmp_QW, pNLSF_Q15, psNLSF_CB->order );
+
+    /* Apply inverse square-rooted weights and add to output */
+    for( i = 0; i < psNLSF_CB->order; i++ ) {
+        W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) );
+        NLSF_Q15_tmp = silk_ADD32( pNLSF_Q15[ i ], silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), W_tmp_Q9 ) );
+        pNLSF_Q15[ i ] = (opus_int16)silk_LIMIT( NLSF_Q15_tmp, 0, 32767 );
+    }
+
+    /* NLSF stabilization */
+    silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
+}
diff --git a/drivers/opus/silk/NLSF_del_dec_quant.c b/drivers/opus/silk/NLSF_del_dec_quant.c
new file mode 100644
index 0000000000..b74585370c
--- /dev/null
+++ b/drivers/opus/silk/NLSF_del_dec_quant.c
@@ -0,0 +1,207 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Delayed-decision quantizer for NLSF residuals */
+opus_int32 silk_NLSF_del_dec_quant(                             /* O    Returns RD value in Q25                     */
+    opus_int8                   indices[],                      /* O    Quantization indices [ order ]              */
+    const opus_int16            x_Q10[],                        /* I    Input [ order ]                             */
+    const opus_int16            w_Q5[],                         /* I    Weights [ order ]                           */
+    const opus_uint8            pred_coef_Q8[],                 /* I    Backward predictor coefs [ order ]          */
+    const opus_int16            ec_ix[],                        /* I    Indices to entropy coding tables [ order ]  */
+    const opus_uint8            ec_rates_Q5[],                  /* I    Rates []                                    */
+    const opus_int              quant_step_size_Q16,            /* I    Quantization step size                      */
+    const opus_int16            inv_quant_step_size_Q6,         /* I    Inverse quantization step size              */
+    const opus_int32            mu_Q20,                         /* I    R/D tradeoff                                */
+    const opus_int16            order                           /* I    Number of input values                      */
+)
+{
+    opus_int         i, j, nStates, ind_tmp, ind_min_max, ind_max_min, in_Q10, res_Q10;
+    opus_int         pred_Q10, diff_Q10, out0_Q10, out1_Q10, rate0_Q5, rate1_Q5;
+    opus_int32       RD_tmp_Q25, min_Q25, min_max_Q25, max_min_Q25, pred_coef_Q16;
+    opus_int         ind_sort[         NLSF_QUANT_DEL_DEC_STATES ];
+    opus_int8        ind[              NLSF_QUANT_DEL_DEC_STATES ][ MAX_LPC_ORDER ];
+    opus_int16       prev_out_Q10[ 2 * NLSF_QUANT_DEL_DEC_STATES ];
+    opus_int32       RD_Q25[       2 * NLSF_QUANT_DEL_DEC_STATES ];
+    opus_int32       RD_min_Q25[       NLSF_QUANT_DEL_DEC_STATES ];
+    opus_int32       RD_max_Q25[       NLSF_QUANT_DEL_DEC_STATES ];
+    const opus_uint8 *rates_Q5;
+
+    silk_assert( (NLSF_QUANT_DEL_DEC_STATES & (NLSF_QUANT_DEL_DEC_STATES-1)) == 0 );     /* must be power of two */
+
+    nStates = 1;
+    RD_Q25[ 0 ] = 0;
+    prev_out_Q10[ 0 ] = 0;
+    for( i = order - 1; ; i-- ) {
+        rates_Q5 = &ec_rates_Q5[ ec_ix[ i ] ];
+        pred_coef_Q16 = silk_LSHIFT( (opus_int32)pred_coef_Q8[ i ], 8 );
+        in_Q10 = x_Q10[ i ];
+        for( j = 0; j < nStates; j++ ) {
+            pred_Q10 = silk_SMULWB( pred_coef_Q16, prev_out_Q10[ j ] );
+            res_Q10  = silk_SUB16( in_Q10, pred_Q10 );
+            ind_tmp  = silk_SMULWB( (opus_int32)inv_quant_step_size_Q6, res_Q10 );
+            ind_tmp  = silk_LIMIT( ind_tmp, -NLSF_QUANT_MAX_AMPLITUDE_EXT, NLSF_QUANT_MAX_AMPLITUDE_EXT-1 );
+            ind[ j ][ i ] = (opus_int8)ind_tmp;
+
+            /* compute outputs for ind_tmp and ind_tmp + 1 */
+            out0_Q10 = silk_LSHIFT( ind_tmp, 10 );
+            out1_Q10 = silk_ADD16( out0_Q10, 1024 );
+            if( ind_tmp > 0 ) {
+                out0_Q10 = silk_SUB16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+                out1_Q10 = silk_SUB16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+            } else if( ind_tmp == 0 ) {
+                out1_Q10 = silk_SUB16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+            } else if( ind_tmp == -1 ) {
+                out0_Q10 = silk_ADD16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+            } else {
+                out0_Q10 = silk_ADD16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+                out1_Q10 = silk_ADD16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
+            }
+            out0_Q10  = silk_SMULWB( (opus_int32)out0_Q10, quant_step_size_Q16 );
+            out1_Q10  = silk_SMULWB( (opus_int32)out1_Q10, quant_step_size_Q16 );
+            out0_Q10  = silk_ADD16( out0_Q10, pred_Q10 );
+            out1_Q10  = silk_ADD16( out1_Q10, pred_Q10 );
+            prev_out_Q10[ j           ] = out0_Q10;
+            prev_out_Q10[ j + nStates ] = out1_Q10;
+
+            /* compute RD for ind_tmp and ind_tmp + 1 */
+            if( ind_tmp + 1 >= NLSF_QUANT_MAX_AMPLITUDE ) {
+                if( ind_tmp + 1 == NLSF_QUANT_MAX_AMPLITUDE ) {
+                    rate0_Q5 = rates_Q5[ ind_tmp + NLSF_QUANT_MAX_AMPLITUDE ];
+                    rate1_Q5 = 280;
+                } else {
+                    rate0_Q5 = silk_SMLABB( 280 - 43 * NLSF_QUANT_MAX_AMPLITUDE, 43, ind_tmp );
+                    rate1_Q5 = silk_ADD16( rate0_Q5, 43 );
+                }
+            } else if( ind_tmp <= -NLSF_QUANT_MAX_AMPLITUDE ) {
+                if( ind_tmp == -NLSF_QUANT_MAX_AMPLITUDE ) {
+                    rate0_Q5 = 280;
+                    rate1_Q5 = rates_Q5[ ind_tmp + 1 + NLSF_QUANT_MAX_AMPLITUDE ];
+                } else {
+                    rate0_Q5 = silk_SMLABB( 280 - 43 * NLSF_QUANT_MAX_AMPLITUDE, -43, ind_tmp );
+                    rate1_Q5 = silk_SUB16( rate0_Q5, 43 );
+                }
+            } else {
+                rate0_Q5 = rates_Q5[ ind_tmp +     NLSF_QUANT_MAX_AMPLITUDE ];
+                rate1_Q5 = rates_Q5[ ind_tmp + 1 + NLSF_QUANT_MAX_AMPLITUDE ];
+            }
+            RD_tmp_Q25            = RD_Q25[ j ];
+            diff_Q10              = silk_SUB16( in_Q10, out0_Q10 );
+            RD_Q25[ j ]           = silk_SMLABB( silk_MLA( RD_tmp_Q25, silk_SMULBB( diff_Q10, diff_Q10 ), w_Q5[ i ] ), mu_Q20, rate0_Q5 );
+            diff_Q10              = silk_SUB16( in_Q10, out1_Q10 );
+            RD_Q25[ j + nStates ] = silk_SMLABB( silk_MLA( RD_tmp_Q25, silk_SMULBB( diff_Q10, diff_Q10 ), w_Q5[ i ] ), mu_Q20, rate1_Q5 );
+        }
+
+        if( nStates <= ( NLSF_QUANT_DEL_DEC_STATES >> 1 ) ) {
+            /* double number of states and copy */
+            for( j = 0; j < nStates; j++ ) {
+                ind[ j + nStates ][ i ] = ind[ j ][ i ] + 1;
+            }
+            nStates = silk_LSHIFT( nStates, 1 );
+            for( j = nStates; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
+                ind[ j ][ i ] = ind[ j - nStates ][ i ];
+            }
+        } else if( i > 0 ) {
+            /* sort lower and upper half of RD_Q25, pairwise */
+            for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
+                if( RD_Q25[ j ] > RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ] ) {
+                    RD_max_Q25[ j ]                         = RD_Q25[ j ];
+                    RD_min_Q25[ j ]                         = RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ];
+                    RD_Q25[ j ]                             = RD_min_Q25[ j ];
+                    RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ] = RD_max_Q25[ j ];
+                    /* swap prev_out values */
+                    out0_Q10 = prev_out_Q10[ j ];
+                    prev_out_Q10[ j ] = prev_out_Q10[ j + NLSF_QUANT_DEL_DEC_STATES ];
+                    prev_out_Q10[ j + NLSF_QUANT_DEL_DEC_STATES ] = out0_Q10;
+                    ind_sort[ j ] = j + NLSF_QUANT_DEL_DEC_STATES;
+                } else {
+                    RD_min_Q25[ j ] = RD_Q25[ j ];
+                    RD_max_Q25[ j ] = RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ];
+                    ind_sort[ j ] = j;
+                }
+            }
+            /* compare the highest RD values of the winning half with the lowest one in the losing half, and copy if necessary */
+            /* afterwards ind_sort[] will contain the indices of the NLSF_QUANT_DEL_DEC_STATES winning RD values */
+            while( 1 ) {
+                min_max_Q25 = silk_int32_MAX;
+                max_min_Q25 = 0;
+                ind_min_max = 0;
+                ind_max_min = 0;
+                for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
+                    if( min_max_Q25 > RD_max_Q25[ j ] ) {
+                        min_max_Q25 = RD_max_Q25[ j ];
+                        ind_min_max = j;
+                    }
+                    if( max_min_Q25 < RD_min_Q25[ j ] ) {
+                        max_min_Q25 = RD_min_Q25[ j ];
+                        ind_max_min = j;
+                    }
+                }
+                if( min_max_Q25 >= max_min_Q25 ) {
+                    break;
+                }
+                /* copy ind_min_max to ind_max_min */
+                ind_sort[     ind_max_min ] = ind_sort[     ind_min_max ] ^ NLSF_QUANT_DEL_DEC_STATES;
+                RD_Q25[       ind_max_min ] = RD_Q25[       ind_min_max + NLSF_QUANT_DEL_DEC_STATES ];
+                prev_out_Q10[ ind_max_min ] = prev_out_Q10[ ind_min_max + NLSF_QUANT_DEL_DEC_STATES ];
+                RD_min_Q25[   ind_max_min ] = 0;
+                RD_max_Q25[   ind_min_max ] = silk_int32_MAX;
+                silk_memcpy( ind[ ind_max_min ], ind[ ind_min_max ], MAX_LPC_ORDER * sizeof( opus_int8 ) );
+            }
+            /* increment index if it comes from the upper half */
+            for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
+                ind[ j ][ i ] += silk_RSHIFT( ind_sort[ j ], NLSF_QUANT_DEL_DEC_STATES_LOG2 );
+            }
+        } else {  /* i == 0 */
+            break;
+        }
+    }
+
+    /* last sample: find winner, copy indices and return RD value */
+    ind_tmp = 0;
+    min_Q25 = silk_int32_MAX;
+    for( j = 0; j < 2 * NLSF_QUANT_DEL_DEC_STATES; j++ ) {
+        if( min_Q25 > RD_Q25[ j ] ) {
+            min_Q25 = RD_Q25[ j ];
+            ind_tmp = j;
+        }
+    }
+    for( j = 0; j < order; j++ ) {
+        indices[ j ] = ind[ ind_tmp & ( NLSF_QUANT_DEL_DEC_STATES - 1 ) ][ j ];
+        silk_assert( indices[ j ] >= -NLSF_QUANT_MAX_AMPLITUDE_EXT );
+        silk_assert( indices[ j ] <=  NLSF_QUANT_MAX_AMPLITUDE_EXT );
+    }
+    indices[ 0 ] += silk_RSHIFT( ind_tmp, NLSF_QUANT_DEL_DEC_STATES_LOG2 );
+    silk_assert( indices[ 0 ] <= NLSF_QUANT_MAX_AMPLITUDE_EXT );
+    silk_assert( min_Q25 >= 0 );
+    return min_Q25;
+}
diff --git a/drivers/opus/silk/NLSF_encode.c b/drivers/opus/silk/NLSF_encode.c
new file mode 100644
index 0000000000..bf67bd5cf1
--- /dev/null
+++ b/drivers/opus/silk/NLSF_encode.c
@@ -0,0 +1,136 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+/***********************/
+/* NLSF vector encoder */
+/***********************/
+opus_int32 silk_NLSF_encode(                                    /* O    Returns RD value in Q25                     */
+          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
+          opus_int16            *pNLSF_Q15,                     /* I/O  Quantized NLSF vector [ LPC_ORDER ]         */
+    const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
+    const opus_int16            *pW_QW,                         /* I    NLSF weight vector [ LPC_ORDER ]            */
+    const opus_int              NLSF_mu_Q20,                    /* I    Rate weight for the RD optimization         */
+    const opus_int              nSurvivors,                     /* I    Max survivors after first stage             */
+    const opus_int              signalType                      /* I    Signal type: 0/1/2                          */
+)
+{
+    opus_int         i, s, ind1, bestIndex, prob_Q8, bits_q7;
+    opus_int32       W_tmp_Q9;
+    VARDECL( opus_int32, err_Q26 );
+    VARDECL( opus_int32, RD_Q25 );
+    VARDECL( opus_int, tempIndices1 );
+    VARDECL( opus_int8, tempIndices2 );
+    opus_int16       res_Q15[      MAX_LPC_ORDER ];
+    opus_int16       res_Q10[      MAX_LPC_ORDER ];
+    opus_int16       NLSF_tmp_Q15[ MAX_LPC_ORDER ];
+    opus_int16       W_tmp_QW[     MAX_LPC_ORDER ];
+    opus_int16       W_adj_Q5[     MAX_LPC_ORDER ];
+    opus_uint8       pred_Q8[      MAX_LPC_ORDER ];
+    opus_int16       ec_ix[        MAX_LPC_ORDER ];
+    const opus_uint8 *pCB_element, *iCDF_ptr;
+    SAVE_STACK;
+
+    silk_assert( nSurvivors <= NLSF_VQ_MAX_SURVIVORS );
+    silk_assert( signalType >= 0 && signalType <= 2 );
+    silk_assert( NLSF_mu_Q20 <= 32767 && NLSF_mu_Q20 >= 0 );
+
+    /* NLSF stabilization */
+    silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
+
+    /* First stage: VQ */
+    ALLOC( err_Q26, psNLSF_CB->nVectors, opus_int32 );
+    silk_NLSF_VQ( err_Q26, pNLSF_Q15, psNLSF_CB->CB1_NLSF_Q8, psNLSF_CB->nVectors, psNLSF_CB->order );
+
+    /* Sort the quantization errors */
+    ALLOC( tempIndices1, nSurvivors, opus_int );
+    silk_insertion_sort_increasing( err_Q26, tempIndices1, psNLSF_CB->nVectors, nSurvivors );
+
+    ALLOC( RD_Q25, nSurvivors, opus_int32 );
+    ALLOC( tempIndices2, nSurvivors * MAX_LPC_ORDER, opus_int8 );
+
+    /* Loop over survivors */
+    for( s = 0; s < nSurvivors; s++ ) {
+        ind1 = tempIndices1[ s ];
+
+        /* Residual after first stage */
+        pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
+        for( i = 0; i < psNLSF_CB->order; i++ ) {
+            NLSF_tmp_Q15[ i ] = silk_LSHIFT16( (opus_int16)pCB_element[ i ], 7 );
+            res_Q15[ i ] = pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ];
+        }
+
+        /* Weights from codebook vector */
+        silk_NLSF_VQ_weights_laroia( W_tmp_QW, NLSF_tmp_Q15, psNLSF_CB->order );
+
+        /* Apply square-rooted weights */
+        for( i = 0; i < psNLSF_CB->order; i++ ) {
+            W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) );
+            res_Q10[ i ] = (opus_int16)silk_RSHIFT( silk_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
+        }
+
+        /* Modify input weights accordingly */
+        for( i = 0; i < psNLSF_CB->order; i++ ) {
+            W_adj_Q5[ i ] = silk_DIV32_16( silk_LSHIFT( (opus_int32)pW_QW[ i ], 5 ), W_tmp_QW[ i ] );
+        }
+
+        /* Unpack entropy table indices and predictor for current CB1 index */
+        silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
+
+        /* Trellis quantizer */
+        RD_Q25[ s ] = silk_NLSF_del_dec_quant( &tempIndices2[ s * MAX_LPC_ORDER ], res_Q10, W_adj_Q5, pred_Q8, ec_ix,
+            psNLSF_CB->ec_Rates_Q5, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->invQuantStepSize_Q6, NLSF_mu_Q20, psNLSF_CB->order );
+
+        /* Add rate for first stage */
+        iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
+        if( ind1 == 0 ) {
+            prob_Q8 = 256 - iCDF_ptr[ ind1 ];
+        } else {
+            prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
+        }
+        bits_q7 = ( 8 << 7 ) - silk_lin2log( prob_Q8 );
+        RD_Q25[ s ] = silk_SMLABB( RD_Q25[ s ], bits_q7, silk_RSHIFT( NLSF_mu_Q20, 2 ) );
+    }
+
+    /* Find the lowest rate-distortion error */
+    silk_insertion_sort_increasing( RD_Q25, &bestIndex, nSurvivors, 1 );
+
+    NLSFIndices[ 0 ] = (opus_int8)tempIndices1[ bestIndex ];
+    silk_memcpy( &NLSFIndices[ 1 ], &tempIndices2[ bestIndex * MAX_LPC_ORDER ], psNLSF_CB->order * sizeof( opus_int8 ) );
+
+    /* Decode */
+    silk_NLSF_decode( pNLSF_Q15, NLSFIndices, psNLSF_CB );
+
+    RESTORE_STACK;
+    return RD_Q25[ 0 ];
+}
diff --git a/drivers/opus/silk/NLSF_stabilize.c b/drivers/opus/silk/NLSF_stabilize.c
new file mode 100644
index 0000000000..a1bf20b8d4
--- /dev/null
+++ b/drivers/opus/silk/NLSF_stabilize.c
@@ -0,0 +1,142 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/* NLSF stabilizer:                                         */
+/*                                                          */
+/* - Moves NLSFs further apart if they are too close        */
+/* - Moves NLSFs away from borders if they are too close    */
+/* - High effort to achieve a modification with minimum     */
+/*     Euclidean distance to input vector                   */
+/* - Output are sorted NLSF coefficients                    */
+/*                                                          */
+
+#include "SigProc_FIX.h"
+
+/* Constant Definitions */
+#define MAX_LOOPS        20
+
+/* NLSF stabilizer, for a single input data vector */
+void silk_NLSF_stabilize(
+          opus_int16            *NLSF_Q15,          /* I/O   Unstable/stabilized normalized LSF vector in Q15 [L]       */
+    const opus_int16            *NDeltaMin_Q15,     /* I     Min distance vector, NDeltaMin_Q15[L] must be >= 1 [L+1]   */
+    const opus_int              L                   /* I     Number of NLSF parameters in the input vector              */
+)
+{
+    opus_int   i, I=0, k, loops;
+    opus_int16 center_freq_Q15;
+    opus_int32 diff_Q15, min_diff_Q15, min_center_Q15, max_center_Q15;
+
+    /* This is necessary to ensure an output within range of a opus_int16 */
+    silk_assert( NDeltaMin_Q15[L] >= 1 );
+
+    for( loops = 0; loops < MAX_LOOPS; loops++ ) {
+        /**************************/
+        /* Find smallest distance */
+        /**************************/
+        /* First element */
+        min_diff_Q15 = NLSF_Q15[0] - NDeltaMin_Q15[0];
+        I = 0;
+        /* Middle elements */
+        for( i = 1; i <= L-1; i++ ) {
+            diff_Q15 = NLSF_Q15[i] - ( NLSF_Q15[i-1] + NDeltaMin_Q15[i] );
+            if( diff_Q15 < min_diff_Q15 ) {
+                min_diff_Q15 = diff_Q15;
+                I = i;
+            }
+        }
+        /* Last element */
+        diff_Q15 = ( 1 << 15 ) - ( NLSF_Q15[L-1] + NDeltaMin_Q15[L] );
+        if( diff_Q15 < min_diff_Q15 ) {
+            min_diff_Q15 = diff_Q15;
+            I = L;
+        }
+
+        /***************************************************/
+        /* Now check if the smallest distance non-negative */
+        /***************************************************/
+        if( min_diff_Q15 >= 0 ) {
+            return;
+        }
+
+        if( I == 0 ) {
+            /* Move away from lower limit */
+            NLSF_Q15[0] = NDeltaMin_Q15[0];
+
+        } else if( I == L) {
+            /* Move away from higher limit */
+            NLSF_Q15[L-1] = ( 1 << 15 ) - NDeltaMin_Q15[L];
+
+        } else {
+            /* Find the lower extreme for the location of the current center frequency */
+            min_center_Q15 = 0;
+            for( k = 0; k < I; k++ ) {
+                min_center_Q15 += NDeltaMin_Q15[k];
+            }
+            min_center_Q15 += silk_RSHIFT( NDeltaMin_Q15[I], 1 );
+
+            /* Find the upper extreme for the location of the current center frequency */
+            max_center_Q15 = 1 << 15;
+            for( k = L; k > I; k-- ) {
+                max_center_Q15 -= NDeltaMin_Q15[k];
+            }
+            max_center_Q15 -= silk_RSHIFT( NDeltaMin_Q15[I], 1 );
+
+            /* Move apart, sorted by value, keeping the same center frequency */
+            center_freq_Q15 = (opus_int16)silk_LIMIT_32( silk_RSHIFT_ROUND( (opus_int32)NLSF_Q15[I-1] + (opus_int32)NLSF_Q15[I], 1 ),
+                min_center_Q15, max_center_Q15 );
+            NLSF_Q15[I-1] = center_freq_Q15 - silk_RSHIFT( NDeltaMin_Q15[I], 1 );
+            NLSF_Q15[I] = NLSF_Q15[I-1] + NDeltaMin_Q15[I];
+        }
+    }
+
+    /* Safe and simple fall back method, which is less ideal than the above */
+    if( loops == MAX_LOOPS )
+    {
+        /* Insertion sort (fast for already almost sorted arrays):   */
+        /* Best case:  O(n)   for an already sorted array            */
+        /* Worst case: O(n^2) for an inversely sorted array          */
+        silk_insertion_sort_increasing_all_values_int16( &NLSF_Q15[0], L );
+
+        /* First NLSF should be no less than NDeltaMin[0] */
+        NLSF_Q15[0] = silk_max_int( NLSF_Q15[0], NDeltaMin_Q15[0] );
+
+        /* Keep delta_min distance between the NLSFs */
+        for( i = 1; i < L; i++ )
+            NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], NLSF_Q15[i-1] + NDeltaMin_Q15[i] );
+
+        /* Last NLSF should be no higher than 1 - NDeltaMin[L] */
+        NLSF_Q15[L-1] = silk_min_int( NLSF_Q15[L-1], (1<<15) - NDeltaMin_Q15[L] );
+
+        /* Keep NDeltaMin distance between the NLSFs */
+        for( i = L-2; i >= 0; i-- )
+            NLSF_Q15[i] = silk_min_int( NLSF_Q15[i], NLSF_Q15[i+1] - NDeltaMin_Q15[i+1] );
+    }
+}
diff --git a/drivers/opus/silk/NLSF_unpack.c b/drivers/opus/silk/NLSF_unpack.c
new file mode 100644
index 0000000000..60242a3b52
--- /dev/null
+++ b/drivers/opus/silk/NLSF_unpack.c
@@ -0,0 +1,55 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Unpack predictor values and indices for entropy coding tables */
+void silk_NLSF_unpack(
+          opus_int16            ec_ix[],                        /* O    Indices to entropy tables [ LPC_ORDER ]     */
+          opus_uint8            pred_Q8[],                      /* O    LSF predictor [ LPC_ORDER ]                 */
+    const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
+    const opus_int              CB1_index                       /* I    Index of vector in first LSF codebook       */
+)
+{
+    opus_int   i;
+    opus_uint8 entry;
+    const opus_uint8 *ec_sel_ptr;
+
+    ec_sel_ptr = &psNLSF_CB->ec_sel[ CB1_index * psNLSF_CB->order / 2 ];
+    for( i = 0; i < psNLSF_CB->order; i += 2 ) {
+        entry = *ec_sel_ptr++;
+        ec_ix  [ i     ] = silk_SMULBB( silk_RSHIFT( entry, 1 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 );
+        pred_Q8[ i     ] = psNLSF_CB->pred_Q8[ i + ( entry & 1 ) * ( psNLSF_CB->order - 1 ) ];
+        ec_ix  [ i + 1 ] = silk_SMULBB( silk_RSHIFT( entry, 5 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 );
+        pred_Q8[ i + 1 ] = psNLSF_CB->pred_Q8[ i + ( silk_RSHIFT( entry, 4 ) & 1 ) * ( psNLSF_CB->order - 1 ) + 1 ];
+    }
+}
+
diff --git a/drivers/opus/silk/NSQ.c b/drivers/opus/silk/NSQ.c
new file mode 100644
index 0000000000..a08e34e893
--- /dev/null
+++ b/drivers/opus/silk/NSQ.c
@@ -0,0 +1,446 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+static OPUS_INLINE void silk_nsq_scale_states(
+    const silk_encoder_state *psEncC,           /* I    Encoder State                   */
+    silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
+    const opus_int32    x_Q3[],                 /* I    input in Q3                     */
+    opus_int32          x_sc_Q10[],             /* O    input scaled with 1/Gain        */
+    const opus_int16    sLTP[],                 /* I    re-whitened LTP state in Q0     */
+    opus_int32          sLTP_Q15[],             /* O    LTP state matching scaled input */
+    opus_int            subfr,                  /* I    subframe number                 */
+    const opus_int      LTP_scale_Q14,          /* I                                    */
+    const opus_int32    Gains_Q16[ MAX_NB_SUBFR ], /* I                                 */
+    const opus_int      pitchL[ MAX_NB_SUBFR ], /* I    Pitch lag                       */
+    const opus_int      signal_type             /* I    Signal type                     */
+);
+
+static OPUS_INLINE void silk_noise_shape_quantizer(
+    silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
+    opus_int            signalType,             /* I    Signal type                     */
+    const opus_int32    x_sc_Q10[],             /* I                                    */
+    opus_int8           pulses[],               /* O                                    */
+    opus_int16          xq[],                   /* O                                    */
+    opus_int32          sLTP_Q15[],             /* I/O  LTP state                       */
+    const opus_int16    a_Q12[],                /* I    Short term prediction coefs     */
+    const opus_int16    b_Q14[],                /* I    Long term prediction coefs      */
+    const opus_int16    AR_shp_Q13[],           /* I    Noise shaping AR coefs          */
+    opus_int            lag,                    /* I    Pitch lag                       */
+    opus_int32          HarmShapeFIRPacked_Q14, /* I                                    */
+    opus_int            Tilt_Q14,               /* I    Spectral tilt                   */
+    opus_int32          LF_shp_Q14,             /* I                                    */
+    opus_int32          Gain_Q16,               /* I                                    */
+    opus_int            Lambda_Q10,             /* I                                    */
+    opus_int            offset_Q10,             /* I                                    */
+    opus_int            length,                 /* I    Input length                    */
+    opus_int            shapingLPCOrder,        /* I    Noise shaping AR filter order   */
+    opus_int            predictLPCOrder         /* I    Prediction filter order         */
+);
+
+void silk_NSQ(
+    const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
+    silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
+    SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
+    const opus_int32            x_Q3[],                                     /* I    Prefiltered input signal        */
+    opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
+    const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
+    const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
+    const opus_int16            AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs             */
+    const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
+    const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
+    const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
+    const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
+    const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
+    const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
+    const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
+)
+{
+    opus_int            k, lag, start_idx, LSF_interpolation_flag;
+    const opus_int16    *A_Q12, *B_Q14, *AR_shp_Q13;
+    opus_int16          *pxq;
+    VARDECL( opus_int32, sLTP_Q15 );
+    VARDECL( opus_int16, sLTP );
+    opus_int32          HarmShapeFIRPacked_Q14;
+    opus_int            offset_Q10;
+    VARDECL( opus_int32, x_sc_Q10 );
+    SAVE_STACK;
+
+    NSQ->rand_seed = psIndices->Seed;
+
+    /* Set unvoiced lag to the previous one, overwrite later for voiced */
+    lag = NSQ->lagPrev;
+
+    silk_assert( NSQ->prev_gain_Q16 != 0 );
+
+    offset_Q10 = silk_Quantization_Offsets_Q10[ psIndices->signalType >> 1 ][ psIndices->quantOffsetType ];
+
+    if( psIndices->NLSFInterpCoef_Q2 == 4 ) {
+        LSF_interpolation_flag = 0;
+    } else {
+        LSF_interpolation_flag = 1;
+    }
+
+    ALLOC( sLTP_Q15,
+           psEncC->ltp_mem_length + psEncC->frame_length, opus_int32 );
+    ALLOC( sLTP, psEncC->ltp_mem_length + psEncC->frame_length, opus_int16 );
+    ALLOC( x_sc_Q10, psEncC->subfr_length, opus_int32 );
+    /* Set up pointers to start of sub frame */
+    NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length;
+    NSQ->sLTP_buf_idx     = psEncC->ltp_mem_length;
+    pxq                   = &NSQ->xq[ psEncC->ltp_mem_length ];
+    for( k = 0; k < psEncC->nb_subfr; k++ ) {
+        A_Q12      = &PredCoef_Q12[ (( k >> 1 ) | ( 1 - LSF_interpolation_flag )) * MAX_LPC_ORDER ];
+        B_Q14      = &LTPCoef_Q14[ k * LTP_ORDER ];
+        AR_shp_Q13 = &AR2_Q13[     k * MAX_SHAPE_LPC_ORDER ];
+
+        /* Noise shape parameters */
+        silk_assert( HarmShapeGain_Q14[ k ] >= 0 );
+        HarmShapeFIRPacked_Q14  =                          silk_RSHIFT( HarmShapeGain_Q14[ k ], 2 );
+        HarmShapeFIRPacked_Q14 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q14[ k ], 1 ), 16 );
+
+        NSQ->rewhite_flag = 0;
+        if( psIndices->signalType == TYPE_VOICED ) {
+            /* Voiced */
+            lag = pitchL[ k ];
+
+            /* Re-whitening */
+            if( ( k & ( 3 - silk_LSHIFT( LSF_interpolation_flag, 1 ) ) ) == 0 ) {
+                /* Rewhiten with new A coefs */
+                start_idx = psEncC->ltp_mem_length - lag - psEncC->predictLPCOrder - LTP_ORDER / 2;
+                silk_assert( start_idx > 0 );
+
+                silk_LPC_analysis_filter( &sLTP[ start_idx ], &NSQ->xq[ start_idx + k * psEncC->subfr_length ],
+                    A_Q12, psEncC->ltp_mem_length - start_idx, psEncC->predictLPCOrder );
+
+                NSQ->rewhite_flag = 1;
+                NSQ->sLTP_buf_idx = psEncC->ltp_mem_length;
+            }
+        }
+
+        silk_nsq_scale_states( psEncC, NSQ, x_Q3, x_sc_Q10, sLTP, sLTP_Q15, k, LTP_scale_Q14, Gains_Q16, pitchL, psIndices->signalType );
+
+        silk_noise_shape_quantizer( NSQ, psIndices->signalType, x_sc_Q10, pulses, pxq, sLTP_Q15, A_Q12, B_Q14,
+            AR_shp_Q13, lag, HarmShapeFIRPacked_Q14, Tilt_Q14[ k ], LF_shp_Q14[ k ], Gains_Q16[ k ], Lambda_Q10,
+            offset_Q10, psEncC->subfr_length, psEncC->shapingLPCOrder, psEncC->predictLPCOrder );
+
+        x_Q3   += psEncC->subfr_length;
+        pulses += psEncC->subfr_length;
+        pxq    += psEncC->subfr_length;
+    }
+
+    /* Update lagPrev for next frame */
+    NSQ->lagPrev = pitchL[ psEncC->nb_subfr - 1 ];
+
+    /* Save quantized speech and noise shaping signals */
+    /* DEBUG_STORE_DATA( enc.pcm, &NSQ->xq[ psEncC->ltp_mem_length ], psEncC->frame_length * sizeof( opus_int16 ) ) */
+    silk_memmove( NSQ->xq,           &NSQ->xq[           psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int16 ) );
+    silk_memmove( NSQ->sLTP_shp_Q14, &NSQ->sLTP_shp_Q14[ psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int32 ) );
+    RESTORE_STACK;
+}
+
+/***********************************/
+/* silk_noise_shape_quantizer  */
+/***********************************/
+static OPUS_INLINE void silk_noise_shape_quantizer(
+    silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
+    opus_int            signalType,             /* I    Signal type                     */
+    const opus_int32    x_sc_Q10[],             /* I                                    */
+    opus_int8           pulses[],               /* O                                    */
+    opus_int16          xq[],                   /* O                                    */
+    opus_int32          sLTP_Q15[],             /* I/O  LTP state                       */
+    const opus_int16    a_Q12[],                /* I    Short term prediction coefs     */
+    const opus_int16    b_Q14[],                /* I    Long term prediction coefs      */
+    const opus_int16    AR_shp_Q13[],           /* I    Noise shaping AR coefs          */
+    opus_int            lag,                    /* I    Pitch lag                       */
+    opus_int32          HarmShapeFIRPacked_Q14, /* I                                    */
+    opus_int            Tilt_Q14,               /* I    Spectral tilt                   */
+    opus_int32          LF_shp_Q14,             /* I                                    */
+    opus_int32          Gain_Q16,               /* I                                    */
+    opus_int            Lambda_Q10,             /* I                                    */
+    opus_int            offset_Q10,             /* I                                    */
+    opus_int            length,                 /* I    Input length                    */
+    opus_int            shapingLPCOrder,        /* I    Noise shaping AR filter order   */
+    opus_int            predictLPCOrder         /* I    Prediction filter order         */
+)
+{
+    opus_int     i, j;
+    opus_int32   LTP_pred_Q13, LPC_pred_Q10, n_AR_Q12, n_LTP_Q13;
+    opus_int32   n_LF_Q12, r_Q10, rr_Q10, q1_Q0, q1_Q10, q2_Q10, rd1_Q20, rd2_Q20;
+    opus_int32   exc_Q14, LPC_exc_Q14, xq_Q14, Gain_Q10;
+    opus_int32   tmp1, tmp2, sLF_AR_shp_Q14;
+    opus_int32   *psLPC_Q14, *shp_lag_ptr, *pred_lag_ptr;
+
+    shp_lag_ptr  = &NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_FIR_TAPS / 2 ];
+    pred_lag_ptr = &sLTP_Q15[ NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2 ];
+    Gain_Q10     = silk_RSHIFT( Gain_Q16, 6 );
+
+    /* Set up short term AR state */
+    psLPC_Q14 = &NSQ->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 ];
+
+    for( i = 0; i < length; i++ ) {
+        /* Generate dither */
+        NSQ->rand_seed = silk_RAND( NSQ->rand_seed );
+
+        /* Short-term prediction */
+        silk_assert( predictLPCOrder == 10 || predictLPCOrder == 16 );
+        /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+        LPC_pred_Q10 = silk_RSHIFT( predictLPCOrder, 1 );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[  0 ], a_Q12[ 0 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -1 ], a_Q12[ 1 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -2 ], a_Q12[ 2 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -3 ], a_Q12[ 3 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -4 ], a_Q12[ 4 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -5 ], a_Q12[ 5 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -6 ], a_Q12[ 6 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -7 ], a_Q12[ 7 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -8 ], a_Q12[ 8 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -9 ], a_Q12[ 9 ] );
+        if( predictLPCOrder == 16 ) {
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -10 ], a_Q12[ 10 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -11 ], a_Q12[ 11 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -12 ], a_Q12[ 12 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -13 ], a_Q12[ 13 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -14 ], a_Q12[ 14 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -15 ], a_Q12[ 15 ] );
+        }
+
+        /* Long-term prediction */
+        if( signalType == TYPE_VOICED ) {
+            /* Unrolled loop */
+            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+            LTP_pred_Q13 = 2;
+            LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[  0 ], b_Q14[ 0 ] );
+            LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -1 ], b_Q14[ 1 ] );
+            LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -2 ], b_Q14[ 2 ] );
+            LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -3 ], b_Q14[ 3 ] );
+            LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -4 ], b_Q14[ 4 ] );
+            pred_lag_ptr++;
+        } else {
+            LTP_pred_Q13 = 0;
+        }
+
+        /* Noise shape feedback */
+        silk_assert( ( shapingLPCOrder & 1 ) == 0 );   /* check that order is even */
+        tmp2 = psLPC_Q14[ 0 ];
+        tmp1 = NSQ->sAR2_Q14[ 0 ];
+        NSQ->sAR2_Q14[ 0 ] = tmp2;
+        n_AR_Q12 = silk_RSHIFT( shapingLPCOrder, 1 );
+        n_AR_Q12 = silk_SMLAWB( n_AR_Q12, tmp2, AR_shp_Q13[ 0 ] );
+        for( j = 2; j < shapingLPCOrder; j += 2 ) {
+            tmp2 = NSQ->sAR2_Q14[ j - 1 ];
+            NSQ->sAR2_Q14[ j - 1 ] = tmp1;
+            n_AR_Q12 = silk_SMLAWB( n_AR_Q12, tmp1, AR_shp_Q13[ j - 1 ] );
+            tmp1 = NSQ->sAR2_Q14[ j + 0 ];
+            NSQ->sAR2_Q14[ j + 0 ] = tmp2;
+            n_AR_Q12 = silk_SMLAWB( n_AR_Q12, tmp2, AR_shp_Q13[ j ] );
+        }
+        NSQ->sAR2_Q14[ shapingLPCOrder - 1 ] = tmp1;
+        n_AR_Q12 = silk_SMLAWB( n_AR_Q12, tmp1, AR_shp_Q13[ shapingLPCOrder - 1 ] );
+
+        n_AR_Q12 = silk_LSHIFT32( n_AR_Q12, 1 );                                /* Q11 -> Q12 */
+        n_AR_Q12 = silk_SMLAWB( n_AR_Q12, NSQ->sLF_AR_shp_Q14, Tilt_Q14 );
+
+        n_LF_Q12 = silk_SMULWB( NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - 1 ], LF_shp_Q14 );
+        n_LF_Q12 = silk_SMLAWT( n_LF_Q12, NSQ->sLF_AR_shp_Q14, LF_shp_Q14 );
+
+        silk_assert( lag > 0 || signalType != TYPE_VOICED );
+
+        /* Combine prediction and noise shaping signals */
+        tmp1 = silk_SUB32( silk_LSHIFT32( LPC_pred_Q10, 2 ), n_AR_Q12 );        /* Q12 */
+        tmp1 = silk_SUB32( tmp1, n_LF_Q12 );                                    /* Q12 */
+        if( lag > 0 ) {
+            /* Symmetric, packed FIR coefficients */
+            n_LTP_Q13 = silk_SMULWB( silk_ADD32( shp_lag_ptr[ 0 ], shp_lag_ptr[ -2 ] ), HarmShapeFIRPacked_Q14 );
+            n_LTP_Q13 = silk_SMLAWT( n_LTP_Q13, shp_lag_ptr[ -1 ],                      HarmShapeFIRPacked_Q14 );
+            n_LTP_Q13 = silk_LSHIFT( n_LTP_Q13, 1 );
+            shp_lag_ptr++;
+
+            tmp2 = silk_SUB32( LTP_pred_Q13, n_LTP_Q13 );                       /* Q13 */
+            tmp1 = silk_ADD_LSHIFT32( tmp2, tmp1, 1 );                          /* Q13 */
+            tmp1 = silk_RSHIFT_ROUND( tmp1, 3 );                                /* Q10 */
+        } else {
+            tmp1 = silk_RSHIFT_ROUND( tmp1, 2 );                                /* Q10 */
+        }
+
+        r_Q10 = silk_SUB32( x_sc_Q10[ i ], tmp1 );                              /* residual error Q10 */
+
+        /* Flip sign depending on dither */
+        if ( NSQ->rand_seed < 0 ) {
+           r_Q10 = -r_Q10;
+        }
+        r_Q10 = silk_LIMIT_32( r_Q10, -(31 << 10), 30 << 10 );
+
+        /* Find two quantization level candidates and measure their rate-distortion */
+        q1_Q10 = silk_SUB32( r_Q10, offset_Q10 );
+        q1_Q0 = silk_RSHIFT( q1_Q10, 10 );
+        if( q1_Q0 > 0 ) {
+            q1_Q10  = silk_SUB32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 );
+            q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
+            q2_Q10  = silk_ADD32( q1_Q10, 1024 );
+            rd1_Q20 = silk_SMULBB( q1_Q10, Lambda_Q10 );
+            rd2_Q20 = silk_SMULBB( q2_Q10, Lambda_Q10 );
+        } else if( q1_Q0 == 0 ) {
+            q1_Q10  = offset_Q10;
+            q2_Q10  = silk_ADD32( q1_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
+            rd1_Q20 = silk_SMULBB( q1_Q10, Lambda_Q10 );
+            rd2_Q20 = silk_SMULBB( q2_Q10, Lambda_Q10 );
+        } else if( q1_Q0 == -1 ) {
+            q2_Q10  = offset_Q10;
+            q1_Q10  = silk_SUB32( q2_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
+            rd1_Q20 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
+            rd2_Q20 = silk_SMULBB(  q2_Q10, Lambda_Q10 );
+        } else {            /* Q1_Q0 < -1 */
+            q1_Q10  = silk_ADD32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 );
+            q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
+            q2_Q10  = silk_ADD32( q1_Q10, 1024 );
+            rd1_Q20 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
+            rd2_Q20 = silk_SMULBB( -q2_Q10, Lambda_Q10 );
+        }
+        rr_Q10  = silk_SUB32( r_Q10, q1_Q10 );
+        rd1_Q20 = silk_SMLABB( rd1_Q20, rr_Q10, rr_Q10 );
+        rr_Q10  = silk_SUB32( r_Q10, q2_Q10 );
+        rd2_Q20 = silk_SMLABB( rd2_Q20, rr_Q10, rr_Q10 );
+
+        if( rd2_Q20 < rd1_Q20 ) {
+            q1_Q10 = q2_Q10;
+        }
+
+        pulses[ i ] = (opus_int8)silk_RSHIFT_ROUND( q1_Q10, 10 );
+
+        /* Excitation */
+        exc_Q14 = silk_LSHIFT( q1_Q10, 4 );
+        if ( NSQ->rand_seed < 0 ) {
+           exc_Q14 = -exc_Q14;
+        }
+
+        /* Add predictions */
+        LPC_exc_Q14 = silk_ADD_LSHIFT32( exc_Q14, LTP_pred_Q13, 1 );
+        xq_Q14      = silk_ADD_LSHIFT32( LPC_exc_Q14, LPC_pred_Q10, 4 );
+
+        /* Scale XQ back to normal level before saving */
+        xq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( xq_Q14, Gain_Q10 ), 8 ) );
+
+        /* Update states */
+        psLPC_Q14++;
+        *psLPC_Q14 = xq_Q14;
+        sLF_AR_shp_Q14 = silk_SUB_LSHIFT32( xq_Q14, n_AR_Q12, 2 );
+        NSQ->sLF_AR_shp_Q14 = sLF_AR_shp_Q14;
+
+        NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx ] = silk_SUB_LSHIFT32( sLF_AR_shp_Q14, n_LF_Q12, 2 );
+        sLTP_Q15[ NSQ->sLTP_buf_idx ] = silk_LSHIFT( LPC_exc_Q14, 1 );
+        NSQ->sLTP_shp_buf_idx++;
+        NSQ->sLTP_buf_idx++;
+
+        /* Make dither dependent on quantized signal */
+        NSQ->rand_seed = silk_ADD32_ovflw( NSQ->rand_seed, pulses[ i ] );
+    }
+
+    /* Update LPC synth buffer */
+    silk_memcpy( NSQ->sLPC_Q14, &NSQ->sLPC_Q14[ length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+}
+
+static OPUS_INLINE void silk_nsq_scale_states(
+    const silk_encoder_state *psEncC,           /* I    Encoder State                   */
+    silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
+    const opus_int32    x_Q3[],                 /* I    input in Q3                     */
+    opus_int32          x_sc_Q10[],             /* O    input scaled with 1/Gain        */
+    const opus_int16    sLTP[],                 /* I    re-whitened LTP state in Q0     */
+    opus_int32          sLTP_Q15[],             /* O    LTP state matching scaled input */
+    opus_int            subfr,                  /* I    subframe number                 */
+    const opus_int      LTP_scale_Q14,          /* I                                    */
+    const opus_int32    Gains_Q16[ MAX_NB_SUBFR ], /* I                                 */
+    const opus_int      pitchL[ MAX_NB_SUBFR ], /* I    Pitch lag                       */
+    const opus_int      signal_type             /* I    Signal type                     */
+)
+{
+    opus_int   i, lag;
+    opus_int32 gain_adj_Q16, inv_gain_Q31, inv_gain_Q23;
+
+    lag          = pitchL[ subfr ];
+    inv_gain_Q31 = silk_INVERSE32_varQ( silk_max( Gains_Q16[ subfr ], 1 ), 47 );
+    silk_assert( inv_gain_Q31 != 0 );
+
+    /* Calculate gain adjustment factor */
+    if( Gains_Q16[ subfr ] != NSQ->prev_gain_Q16 ) {
+        gain_adj_Q16 =  silk_DIV32_varQ( NSQ->prev_gain_Q16, Gains_Q16[ subfr ], 16 );
+    } else {
+        gain_adj_Q16 = (opus_int32)1 << 16;
+    }
+
+    /* Scale input */
+    inv_gain_Q23 = silk_RSHIFT_ROUND( inv_gain_Q31, 8 );
+    for( i = 0; i < psEncC->subfr_length; i++ ) {
+        x_sc_Q10[ i ] = silk_SMULWW( x_Q3[ i ], inv_gain_Q23 );
+    }
+
+    /* Save inverse gain */
+    NSQ->prev_gain_Q16 = Gains_Q16[ subfr ];
+
+    /* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16 */
+    if( NSQ->rewhite_flag ) {
+        if( subfr == 0 ) {
+            /* Do LTP downscaling */
+            inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, LTP_scale_Q14 ), 2 );
+        }
+        for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
+            silk_assert( i < MAX_FRAME_LENGTH );
+            sLTP_Q15[ i ] = silk_SMULWB( inv_gain_Q31, sLTP[ i ] );
+        }
+    }
+
+    /* Adjust for changing gain */
+    if( gain_adj_Q16 != (opus_int32)1 << 16 ) {
+        /* Scale long-term shaping state */
+        for( i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_shp_buf_idx; i++ ) {
+            NSQ->sLTP_shp_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLTP_shp_Q14[ i ] );
+        }
+
+        /* Scale long-term prediction state */
+        if( signal_type == TYPE_VOICED && NSQ->rewhite_flag == 0 ) {
+            for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
+                sLTP_Q15[ i ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ i ] );
+            }
+        }
+
+        NSQ->sLF_AR_shp_Q14 = silk_SMULWW( gain_adj_Q16, NSQ->sLF_AR_shp_Q14 );
+
+        /* Scale short-term prediction and shaping states */
+        for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) {
+            NSQ->sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLPC_Q14[ i ] );
+        }
+        for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) {
+            NSQ->sAR2_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sAR2_Q14[ i ] );
+        }
+    }
+}
diff --git a/drivers/opus/silk/NSQ_del_dec.c b/drivers/opus/silk/NSQ_del_dec.c
new file mode 100644
index 0000000000..8ac6311b11
--- /dev/null
+++ b/drivers/opus/silk/NSQ_del_dec.c
@@ -0,0 +1,719 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+typedef struct {
+    opus_int32 sLPC_Q14[ MAX_SUB_FRAME_LENGTH + NSQ_LPC_BUF_LENGTH ];
+    opus_int32 RandState[ DECISION_DELAY ];
+    opus_int32 Q_Q10[     DECISION_DELAY ];
+    opus_int32 Xq_Q14[    DECISION_DELAY ];
+    opus_int32 Pred_Q15[  DECISION_DELAY ];
+    opus_int32 Shape_Q14[ DECISION_DELAY ];
+    opus_int32 sAR2_Q14[ MAX_SHAPE_LPC_ORDER ];
+    opus_int32 LF_AR_Q14;
+    opus_int32 Seed;
+    opus_int32 SeedInit;
+    opus_int32 RD_Q10;
+} NSQ_del_dec_struct;
+
+typedef struct {
+    opus_int32 Q_Q10;
+    opus_int32 RD_Q10;
+    opus_int32 xq_Q14;
+    opus_int32 LF_AR_Q14;
+    opus_int32 sLTP_shp_Q14;
+    opus_int32 LPC_exc_Q14;
+} NSQ_sample_struct;
+
+typedef NSQ_sample_struct  NSQ_sample_pair[ 2 ];
+
+static OPUS_INLINE void silk_nsq_del_dec_scale_states(
+    const silk_encoder_state *psEncC,               /* I    Encoder State                       */
+    silk_nsq_state      *NSQ,                       /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],                 /* I/O  Delayed decision states             */
+    const opus_int32    x_Q3[],                     /* I    Input in Q3                         */
+    opus_int32          x_sc_Q10[],                 /* O    Input scaled with 1/Gain in Q10     */
+    const opus_int16    sLTP[],                     /* I    Re-whitened LTP state in Q0         */
+    opus_int32          sLTP_Q15[],                 /* O    LTP state matching scaled input     */
+    opus_int            subfr,                      /* I    Subframe number                     */
+    opus_int            nStatesDelayedDecision,     /* I    Number of del dec states            */
+    const opus_int      LTP_scale_Q14,              /* I    LTP state scaling                   */
+    const opus_int32    Gains_Q16[ MAX_NB_SUBFR ],  /* I                                        */
+    const opus_int      pitchL[ MAX_NB_SUBFR ],     /* I    Pitch lag                           */
+    const opus_int      signal_type,                /* I    Signal type                         */
+    const opus_int      decisionDelay               /* I    Decision delay                      */
+);
+
+/******************************************/
+/* Noise shape quantizer for one subframe */
+/******************************************/
+static OPUS_INLINE void silk_noise_shape_quantizer_del_dec(
+    silk_nsq_state      *NSQ,                   /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],             /* I/O  Delayed decision states             */
+    opus_int            signalType,             /* I    Signal type                         */
+    const opus_int32    x_Q10[],                /* I                                        */
+    opus_int8           pulses[],               /* O                                        */
+    opus_int16          xq[],                   /* O                                        */
+    opus_int32          sLTP_Q15[],             /* I/O  LTP filter state                    */
+    opus_int32          delayedGain_Q10[],      /* I/O  Gain delay buffer                   */
+    const opus_int16    a_Q12[],                /* I    Short term prediction coefs         */
+    const opus_int16    b_Q14[],                /* I    Long term prediction coefs          */
+    const opus_int16    AR_shp_Q13[],           /* I    Noise shaping coefs                 */
+    opus_int            lag,                    /* I    Pitch lag                           */
+    opus_int32          HarmShapeFIRPacked_Q14, /* I                                        */
+    opus_int            Tilt_Q14,               /* I    Spectral tilt                       */
+    opus_int32          LF_shp_Q14,             /* I                                        */
+    opus_int32          Gain_Q16,               /* I                                        */
+    opus_int            Lambda_Q10,             /* I                                        */
+    opus_int            offset_Q10,             /* I                                        */
+    opus_int            length,                 /* I    Input length                        */
+    opus_int            subfr,                  /* I    Subframe number                     */
+    opus_int            shapingLPCOrder,        /* I    Shaping LPC filter order            */
+    opus_int            predictLPCOrder,        /* I    Prediction filter order             */
+    opus_int            warping_Q16,            /* I                                        */
+    opus_int            nStatesDelayedDecision, /* I    Number of states in decision tree   */
+    opus_int            *smpl_buf_idx,          /* I    Index to newest samples in buffers  */
+    opus_int            decisionDelay           /* I                                        */
+);
+
+void silk_NSQ_del_dec(
+    const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
+    silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
+    SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
+    const opus_int32            x_Q3[],                                     /* I    Prefiltered input signal        */
+    opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
+    const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
+    const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
+    const opus_int16            AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs             */
+    const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
+    const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
+    const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
+    const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
+    const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
+    const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
+    const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
+)
+{
+    opus_int            i, k, lag, start_idx, LSF_interpolation_flag, Winner_ind, subfr;
+    opus_int            last_smple_idx, smpl_buf_idx, decisionDelay;
+    const opus_int16    *A_Q12, *B_Q14, *AR_shp_Q13;
+    opus_int16          *pxq;
+    VARDECL( opus_int32, sLTP_Q15 );
+    VARDECL( opus_int16, sLTP );
+    opus_int32          HarmShapeFIRPacked_Q14;
+    opus_int            offset_Q10;
+    opus_int32          RDmin_Q10, Gain_Q10;
+    VARDECL( opus_int32, x_sc_Q10 );
+    VARDECL( opus_int32, delayedGain_Q10 );
+    VARDECL( NSQ_del_dec_struct, psDelDec );
+    NSQ_del_dec_struct  *psDD;
+    SAVE_STACK;
+
+    /* Set unvoiced lag to the previous one, overwrite later for voiced */
+    lag = NSQ->lagPrev;
+
+    silk_assert( NSQ->prev_gain_Q16 != 0 );
+
+    /* Initialize delayed decision states */
+    ALLOC( psDelDec, psEncC->nStatesDelayedDecision, NSQ_del_dec_struct );
+    silk_memset( psDelDec, 0, psEncC->nStatesDelayedDecision * sizeof( NSQ_del_dec_struct ) );
+    for( k = 0; k < psEncC->nStatesDelayedDecision; k++ ) {
+        psDD                 = &psDelDec[ k ];
+        psDD->Seed           = ( k + psIndices->Seed ) & 3;
+        psDD->SeedInit       = psDD->Seed;
+        psDD->RD_Q10         = 0;
+        psDD->LF_AR_Q14      = NSQ->sLF_AR_shp_Q14;
+        psDD->Shape_Q14[ 0 ] = NSQ->sLTP_shp_Q14[ psEncC->ltp_mem_length - 1 ];
+        silk_memcpy( psDD->sLPC_Q14, NSQ->sLPC_Q14, NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+        silk_memcpy( psDD->sAR2_Q14, NSQ->sAR2_Q14, sizeof( NSQ->sAR2_Q14 ) );
+    }
+
+    offset_Q10   = silk_Quantization_Offsets_Q10[ psIndices->signalType >> 1 ][ psIndices->quantOffsetType ];
+    smpl_buf_idx = 0; /* index of oldest samples */
+
+    decisionDelay = silk_min_int( DECISION_DELAY, psEncC->subfr_length );
+
+    /* For voiced frames limit the decision delay to lower than the pitch lag */
+    if( psIndices->signalType == TYPE_VOICED ) {
+        for( k = 0; k < psEncC->nb_subfr; k++ ) {
+            decisionDelay = silk_min_int( decisionDelay, pitchL[ k ] - LTP_ORDER / 2 - 1 );
+        }
+    } else {
+        if( lag > 0 ) {
+            decisionDelay = silk_min_int( decisionDelay, lag - LTP_ORDER / 2 - 1 );
+        }
+    }
+
+    if( psIndices->NLSFInterpCoef_Q2 == 4 ) {
+        LSF_interpolation_flag = 0;
+    } else {
+        LSF_interpolation_flag = 1;
+    }
+
+    ALLOC( sLTP_Q15,
+           psEncC->ltp_mem_length + psEncC->frame_length, opus_int32 );
+    ALLOC( sLTP, psEncC->ltp_mem_length + psEncC->frame_length, opus_int16 );
+    ALLOC( x_sc_Q10, psEncC->subfr_length, opus_int32 );
+    ALLOC( delayedGain_Q10, DECISION_DELAY, opus_int32 );
+    /* Set up pointers to start of sub frame */
+    pxq                   = &NSQ->xq[ psEncC->ltp_mem_length ];
+    NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length;
+    NSQ->sLTP_buf_idx     = psEncC->ltp_mem_length;
+    subfr = 0;
+    for( k = 0; k < psEncC->nb_subfr; k++ ) {
+        A_Q12      = &PredCoef_Q12[ ( ( k >> 1 ) | ( 1 - LSF_interpolation_flag ) ) * MAX_LPC_ORDER ];
+        B_Q14      = &LTPCoef_Q14[ k * LTP_ORDER           ];
+        AR_shp_Q13 = &AR2_Q13[     k * MAX_SHAPE_LPC_ORDER ];
+
+        /* Noise shape parameters */
+        silk_assert( HarmShapeGain_Q14[ k ] >= 0 );
+        HarmShapeFIRPacked_Q14  =                          silk_RSHIFT( HarmShapeGain_Q14[ k ], 2 );
+        HarmShapeFIRPacked_Q14 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q14[ k ], 1 ), 16 );
+
+        NSQ->rewhite_flag = 0;
+        if( psIndices->signalType == TYPE_VOICED ) {
+            /* Voiced */
+            lag = pitchL[ k ];
+
+            /* Re-whitening */
+            if( ( k & ( 3 - silk_LSHIFT( LSF_interpolation_flag, 1 ) ) ) == 0 ) {
+                if( k == 2 ) {
+                    /* RESET DELAYED DECISIONS */
+                    /* Find winner */
+                    RDmin_Q10 = psDelDec[ 0 ].RD_Q10;
+                    Winner_ind = 0;
+                    for( i = 1; i < psEncC->nStatesDelayedDecision; i++ ) {
+                        if( psDelDec[ i ].RD_Q10 < RDmin_Q10 ) {
+                            RDmin_Q10 = psDelDec[ i ].RD_Q10;
+                            Winner_ind = i;
+                        }
+                    }
+                    for( i = 0; i < psEncC->nStatesDelayedDecision; i++ ) {
+                        if( i != Winner_ind ) {
+                            psDelDec[ i ].RD_Q10 += ( silk_int32_MAX >> 4 );
+                            silk_assert( psDelDec[ i ].RD_Q10 >= 0 );
+                        }
+                    }
+
+                    /* Copy final part of signals from winner state to output and long-term filter states */
+                    psDD = &psDelDec[ Winner_ind ];
+                    last_smple_idx = smpl_buf_idx + decisionDelay;
+                    for( i = 0; i < decisionDelay; i++ ) {
+                        last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY_MASK;
+                        pulses[   i - decisionDelay ] = (opus_int8)silk_RSHIFT_ROUND( psDD->Q_Q10[ last_smple_idx ], 10 );
+                        pxq[ i - decisionDelay ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND(
+                            silk_SMULWW( psDD->Xq_Q14[ last_smple_idx ], Gains_Q16[ 1 ] ), 14 ) );
+                        NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - decisionDelay + i ] = psDD->Shape_Q14[ last_smple_idx ];
+                    }
+
+                    subfr = 0;
+                }
+
+                /* Rewhiten with new A coefs */
+                start_idx = psEncC->ltp_mem_length - lag - psEncC->predictLPCOrder - LTP_ORDER / 2;
+                silk_assert( start_idx > 0 );
+
+                silk_LPC_analysis_filter( &sLTP[ start_idx ], &NSQ->xq[ start_idx + k * psEncC->subfr_length ],
+                    A_Q12, psEncC->ltp_mem_length - start_idx, psEncC->predictLPCOrder );
+
+                NSQ->sLTP_buf_idx = psEncC->ltp_mem_length;
+                NSQ->rewhite_flag = 1;
+            }
+        }
+
+        silk_nsq_del_dec_scale_states( psEncC, NSQ, psDelDec, x_Q3, x_sc_Q10, sLTP, sLTP_Q15, k,
+            psEncC->nStatesDelayedDecision, LTP_scale_Q14, Gains_Q16, pitchL, psIndices->signalType, decisionDelay );
+
+        silk_noise_shape_quantizer_del_dec( NSQ, psDelDec, psIndices->signalType, x_sc_Q10, pulses, pxq, sLTP_Q15,
+            delayedGain_Q10, A_Q12, B_Q14, AR_shp_Q13, lag, HarmShapeFIRPacked_Q14, Tilt_Q14[ k ], LF_shp_Q14[ k ],
+            Gains_Q16[ k ], Lambda_Q10, offset_Q10, psEncC->subfr_length, subfr++, psEncC->shapingLPCOrder,
+            psEncC->predictLPCOrder, psEncC->warping_Q16, psEncC->nStatesDelayedDecision, &smpl_buf_idx, decisionDelay );
+
+        x_Q3   += psEncC->subfr_length;
+        pulses += psEncC->subfr_length;
+        pxq    += psEncC->subfr_length;
+    }
+
+    /* Find winner */
+    RDmin_Q10 = psDelDec[ 0 ].RD_Q10;
+    Winner_ind = 0;
+    for( k = 1; k < psEncC->nStatesDelayedDecision; k++ ) {
+        if( psDelDec[ k ].RD_Q10 < RDmin_Q10 ) {
+            RDmin_Q10 = psDelDec[ k ].RD_Q10;
+            Winner_ind = k;
+        }
+    }
+
+    /* Copy final part of signals from winner state to output and long-term filter states */
+    psDD = &psDelDec[ Winner_ind ];
+    psIndices->Seed = psDD->SeedInit;
+    last_smple_idx = smpl_buf_idx + decisionDelay;
+    Gain_Q10 = silk_RSHIFT32( Gains_Q16[ psEncC->nb_subfr - 1 ], 6 );
+    for( i = 0; i < decisionDelay; i++ ) {
+        last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY_MASK;
+        pulses[   i - decisionDelay ] = (opus_int8)silk_RSHIFT_ROUND( psDD->Q_Q10[ last_smple_idx ], 10 );
+        pxq[ i - decisionDelay ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND(
+            silk_SMULWW( psDD->Xq_Q14[ last_smple_idx ], Gain_Q10 ), 8 ) );
+        NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - decisionDelay + i ] = psDD->Shape_Q14[ last_smple_idx ];
+    }
+    silk_memcpy( NSQ->sLPC_Q14, &psDD->sLPC_Q14[ psEncC->subfr_length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+    silk_memcpy( NSQ->sAR2_Q14, psDD->sAR2_Q14, sizeof( psDD->sAR2_Q14 ) );
+
+    /* Update states */
+    NSQ->sLF_AR_shp_Q14 = psDD->LF_AR_Q14;
+    NSQ->lagPrev        = pitchL[ psEncC->nb_subfr - 1 ];
+
+    /* Save quantized speech signal */
+    /* DEBUG_STORE_DATA( enc.pcm, &NSQ->xq[psEncC->ltp_mem_length], psEncC->frame_length * sizeof( opus_int16 ) ) */
+    silk_memmove( NSQ->xq,           &NSQ->xq[           psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int16 ) );
+    silk_memmove( NSQ->sLTP_shp_Q14, &NSQ->sLTP_shp_Q14[ psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int32 ) );
+    RESTORE_STACK;
+}
+
+/******************************************/
+/* Noise shape quantizer for one subframe */
+/******************************************/
+static OPUS_INLINE void silk_noise_shape_quantizer_del_dec(
+    silk_nsq_state      *NSQ,                   /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],             /* I/O  Delayed decision states             */
+    opus_int            signalType,             /* I    Signal type                         */
+    const opus_int32    x_Q10[],                /* I                                        */
+    opus_int8           pulses[],               /* O                                        */
+    opus_int16          xq[],                   /* O                                        */
+    opus_int32          sLTP_Q15[],             /* I/O  LTP filter state                    */
+    opus_int32          delayedGain_Q10[],      /* I/O  Gain delay buffer                   */
+    const opus_int16    a_Q12[],                /* I    Short term prediction coefs         */
+    const opus_int16    b_Q14[],                /* I    Long term prediction coefs          */
+    const opus_int16    AR_shp_Q13[],           /* I    Noise shaping coefs                 */
+    opus_int            lag,                    /* I    Pitch lag                           */
+    opus_int32          HarmShapeFIRPacked_Q14, /* I                                        */
+    opus_int            Tilt_Q14,               /* I    Spectral tilt                       */
+    opus_int32          LF_shp_Q14,             /* I                                        */
+    opus_int32          Gain_Q16,               /* I                                        */
+    opus_int            Lambda_Q10,             /* I                                        */
+    opus_int            offset_Q10,             /* I                                        */
+    opus_int            length,                 /* I    Input length                        */
+    opus_int            subfr,                  /* I    Subframe number                     */
+    opus_int            shapingLPCOrder,        /* I    Shaping LPC filter order            */
+    opus_int            predictLPCOrder,        /* I    Prediction filter order             */
+    opus_int            warping_Q16,            /* I                                        */
+    opus_int            nStatesDelayedDecision, /* I    Number of states in decision tree   */
+    opus_int            *smpl_buf_idx,          /* I    Index to newest samples in buffers  */
+    opus_int            decisionDelay           /* I                                        */
+)
+{
+    opus_int     i, j, k, Winner_ind, RDmin_ind, RDmax_ind, last_smple_idx;
+    opus_int32   Winner_rand_state;
+    opus_int32   LTP_pred_Q14, LPC_pred_Q14, n_AR_Q14, n_LTP_Q14;
+    opus_int32   n_LF_Q14, r_Q10, rr_Q10, rd1_Q10, rd2_Q10, RDmin_Q10, RDmax_Q10;
+    opus_int32   q1_Q0, q1_Q10, q2_Q10, exc_Q14, LPC_exc_Q14, xq_Q14, Gain_Q10;
+    opus_int32   tmp1, tmp2, sLF_AR_shp_Q14;
+    opus_int32   *pred_lag_ptr, *shp_lag_ptr, *psLPC_Q14;
+    VARDECL( NSQ_sample_pair, psSampleState );
+    NSQ_del_dec_struct *psDD;
+    NSQ_sample_struct  *psSS;
+    SAVE_STACK;
+
+    silk_assert( nStatesDelayedDecision > 0 );
+    ALLOC( psSampleState, nStatesDelayedDecision, NSQ_sample_pair );
+
+    shp_lag_ptr  = &NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_FIR_TAPS / 2 ];
+    pred_lag_ptr = &sLTP_Q15[ NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2 ];
+    Gain_Q10     = silk_RSHIFT( Gain_Q16, 6 );
+
+    for( i = 0; i < length; i++ ) {
+        /* Perform common calculations used in all states */
+
+        /* Long-term prediction */
+        if( signalType == TYPE_VOICED ) {
+            /* Unrolled loop */
+            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+            LTP_pred_Q14 = 2;
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[  0 ], b_Q14[ 0 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -1 ], b_Q14[ 1 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -2 ], b_Q14[ 2 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -3 ], b_Q14[ 3 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -4 ], b_Q14[ 4 ] );
+            LTP_pred_Q14 = silk_LSHIFT( LTP_pred_Q14, 1 );                          /* Q13 -> Q14 */
+            pred_lag_ptr++;
+        } else {
+            LTP_pred_Q14 = 0;
+        }
+
+        /* Long-term shaping */
+        if( lag > 0 ) {
+            /* Symmetric, packed FIR coefficients */
+            n_LTP_Q14 = silk_SMULWB( silk_ADD32( shp_lag_ptr[ 0 ], shp_lag_ptr[ -2 ] ), HarmShapeFIRPacked_Q14 );
+            n_LTP_Q14 = silk_SMLAWT( n_LTP_Q14, shp_lag_ptr[ -1 ],                      HarmShapeFIRPacked_Q14 );
+            n_LTP_Q14 = silk_SUB_LSHIFT32( LTP_pred_Q14, n_LTP_Q14, 2 );            /* Q12 -> Q14 */
+            shp_lag_ptr++;
+        } else {
+            n_LTP_Q14 = 0;
+        }
+
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            /* Delayed decision state */
+            psDD = &psDelDec[ k ];
+
+            /* Sample state */
+            psSS = psSampleState[ k ];
+
+            /* Generate dither */
+            psDD->Seed = silk_RAND( psDD->Seed );
+
+            /* Pointer used in short term prediction and shaping */
+            psLPC_Q14 = &psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 + i ];
+            /* Short-term prediction */
+            silk_assert( predictLPCOrder == 10 || predictLPCOrder == 16 );
+            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+            LPC_pred_Q14 = silk_RSHIFT( predictLPCOrder, 1 );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[  0 ], a_Q12[ 0 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -1 ], a_Q12[ 1 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -2 ], a_Q12[ 2 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -3 ], a_Q12[ 3 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -4 ], a_Q12[ 4 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -5 ], a_Q12[ 5 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -6 ], a_Q12[ 6 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -7 ], a_Q12[ 7 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -8 ], a_Q12[ 8 ] );
+            LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -9 ], a_Q12[ 9 ] );
+            if( predictLPCOrder == 16 ) {
+                LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -10 ], a_Q12[ 10 ] );
+                LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -11 ], a_Q12[ 11 ] );
+                LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -12 ], a_Q12[ 12 ] );
+                LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -13 ], a_Q12[ 13 ] );
+                LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -14 ], a_Q12[ 14 ] );
+                LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -15 ], a_Q12[ 15 ] );
+            }
+            LPC_pred_Q14 = silk_LSHIFT( LPC_pred_Q14, 4 );                              /* Q10 -> Q14 */
+
+            /* Noise shape feedback */
+            silk_assert( ( shapingLPCOrder & 1 ) == 0 );   /* check that order is even */
+            /* Output of lowpass section */
+            tmp2 = silk_SMLAWB( psLPC_Q14[ 0 ], psDD->sAR2_Q14[ 0 ], warping_Q16 );
+            /* Output of allpass section */
+            tmp1 = silk_SMLAWB( psDD->sAR2_Q14[ 0 ], psDD->sAR2_Q14[ 1 ] - tmp2, warping_Q16 );
+            psDD->sAR2_Q14[ 0 ] = tmp2;
+            n_AR_Q14 = silk_RSHIFT( shapingLPCOrder, 1 );
+            n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp2, AR_shp_Q13[ 0 ] );
+            /* Loop over allpass sections */
+            for( j = 2; j < shapingLPCOrder; j += 2 ) {
+                /* Output of allpass section */
+                tmp2 = silk_SMLAWB( psDD->sAR2_Q14[ j - 1 ], psDD->sAR2_Q14[ j + 0 ] - tmp1, warping_Q16 );
+                psDD->sAR2_Q14[ j - 1 ] = tmp1;
+                n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp1, AR_shp_Q13[ j - 1 ] );
+                /* Output of allpass section */
+                tmp1 = silk_SMLAWB( psDD->sAR2_Q14[ j + 0 ], psDD->sAR2_Q14[ j + 1 ] - tmp2, warping_Q16 );
+                psDD->sAR2_Q14[ j + 0 ] = tmp2;
+                n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp2, AR_shp_Q13[ j ] );
+            }
+            psDD->sAR2_Q14[ shapingLPCOrder - 1 ] = tmp1;
+            n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp1, AR_shp_Q13[ shapingLPCOrder - 1 ] );
+
+            n_AR_Q14 = silk_LSHIFT( n_AR_Q14, 1 );                                      /* Q11 -> Q12 */
+            n_AR_Q14 = silk_SMLAWB( n_AR_Q14, psDD->LF_AR_Q14, Tilt_Q14 );              /* Q12 */
+            n_AR_Q14 = silk_LSHIFT( n_AR_Q14, 2 );                                      /* Q12 -> Q14 */
+
+            n_LF_Q14 = silk_SMULWB( psDD->Shape_Q14[ *smpl_buf_idx ], LF_shp_Q14 );     /* Q12 */
+            n_LF_Q14 = silk_SMLAWT( n_LF_Q14, psDD->LF_AR_Q14, LF_shp_Q14 );            /* Q12 */
+            n_LF_Q14 = silk_LSHIFT( n_LF_Q14, 2 );                                      /* Q12 -> Q14 */
+
+            /* Input minus prediction plus noise feedback                       */
+            /* r = x[ i ] - LTP_pred - LPC_pred + n_AR + n_Tilt + n_LF + n_LTP  */
+            tmp1 = silk_ADD32( n_AR_Q14, n_LF_Q14 );                                    /* Q14 */
+            tmp2 = silk_ADD32( n_LTP_Q14, LPC_pred_Q14 );                               /* Q13 */
+            tmp1 = silk_SUB32( tmp2, tmp1 );                                            /* Q13 */
+            tmp1 = silk_RSHIFT_ROUND( tmp1, 4 );                                        /* Q10 */
+
+            r_Q10 = silk_SUB32( x_Q10[ i ], tmp1 );                                     /* residual error Q10 */
+
+            /* Flip sign depending on dither */
+            if ( psDD->Seed < 0 ) {
+                r_Q10 = -r_Q10;
+            }
+            r_Q10 = silk_LIMIT_32( r_Q10, -(31 << 10), 30 << 10 );
+
+            /* Find two quantization level candidates and measure their rate-distortion */
+            q1_Q10 = silk_SUB32( r_Q10, offset_Q10 );
+            q1_Q0 = silk_RSHIFT( q1_Q10, 10 );
+            if( q1_Q0 > 0 ) {
+                q1_Q10  = silk_SUB32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 );
+                q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
+                q2_Q10  = silk_ADD32( q1_Q10, 1024 );
+                rd1_Q10 = silk_SMULBB( q1_Q10, Lambda_Q10 );
+                rd2_Q10 = silk_SMULBB( q2_Q10, Lambda_Q10 );
+            } else if( q1_Q0 == 0 ) {
+                q1_Q10  = offset_Q10;
+                q2_Q10  = silk_ADD32( q1_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
+                rd1_Q10 = silk_SMULBB( q1_Q10, Lambda_Q10 );
+                rd2_Q10 = silk_SMULBB( q2_Q10, Lambda_Q10 );
+            } else if( q1_Q0 == -1 ) {
+                q2_Q10  = offset_Q10;
+                q1_Q10  = silk_SUB32( q2_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
+                rd1_Q10 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
+                rd2_Q10 = silk_SMULBB(  q2_Q10, Lambda_Q10 );
+            } else {            /* q1_Q0 < -1 */
+                q1_Q10  = silk_ADD32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 );
+                q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
+                q2_Q10  = silk_ADD32( q1_Q10, 1024 );
+                rd1_Q10 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
+                rd2_Q10 = silk_SMULBB( -q2_Q10, Lambda_Q10 );
+            }
+            rr_Q10  = silk_SUB32( r_Q10, q1_Q10 );
+            rd1_Q10 = silk_RSHIFT( silk_SMLABB( rd1_Q10, rr_Q10, rr_Q10 ), 10 );
+            rr_Q10  = silk_SUB32( r_Q10, q2_Q10 );
+            rd2_Q10 = silk_RSHIFT( silk_SMLABB( rd2_Q10, rr_Q10, rr_Q10 ), 10 );
+
+            if( rd1_Q10 < rd2_Q10 ) {
+                psSS[ 0 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd1_Q10 );
+                psSS[ 1 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd2_Q10 );
+                psSS[ 0 ].Q_Q10  = q1_Q10;
+                psSS[ 1 ].Q_Q10  = q2_Q10;
+            } else {
+                psSS[ 0 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd2_Q10 );
+                psSS[ 1 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd1_Q10 );
+                psSS[ 0 ].Q_Q10  = q2_Q10;
+                psSS[ 1 ].Q_Q10  = q1_Q10;
+            }
+
+            /* Update states for best quantization */
+
+            /* Quantized excitation */
+            exc_Q14 = silk_LSHIFT32( psSS[ 0 ].Q_Q10, 4 );
+            if ( psDD->Seed < 0 ) {
+                exc_Q14 = -exc_Q14;
+            }
+
+            /* Add predictions */
+            LPC_exc_Q14 = silk_ADD32( exc_Q14, LTP_pred_Q14 );
+            xq_Q14      = silk_ADD32( LPC_exc_Q14, LPC_pred_Q14 );
+
+            /* Update states */
+            sLF_AR_shp_Q14         = silk_SUB32( xq_Q14, n_AR_Q14 );
+            psSS[ 0 ].sLTP_shp_Q14 = silk_SUB32( sLF_AR_shp_Q14, n_LF_Q14 );
+            psSS[ 0 ].LF_AR_Q14    = sLF_AR_shp_Q14;
+            psSS[ 0 ].LPC_exc_Q14  = LPC_exc_Q14;
+            psSS[ 0 ].xq_Q14       = xq_Q14;
+
+            /* Update states for second best quantization */
+
+            /* Quantized excitation */
+            exc_Q14 = silk_LSHIFT32( psSS[ 1 ].Q_Q10, 4 );
+            if ( psDD->Seed < 0 ) {
+                exc_Q14 = -exc_Q14;
+            }
+
+
+            /* Add predictions */
+            LPC_exc_Q14 = silk_ADD32( exc_Q14, LTP_pred_Q14 );
+            xq_Q14      = silk_ADD32( LPC_exc_Q14, LPC_pred_Q14 );
+
+            /* Update states */
+            sLF_AR_shp_Q14         = silk_SUB32( xq_Q14, n_AR_Q14 );
+            psSS[ 1 ].sLTP_shp_Q14 = silk_SUB32( sLF_AR_shp_Q14, n_LF_Q14 );
+            psSS[ 1 ].LF_AR_Q14    = sLF_AR_shp_Q14;
+            psSS[ 1 ].LPC_exc_Q14  = LPC_exc_Q14;
+            psSS[ 1 ].xq_Q14       = xq_Q14;
+        }
+
+        *smpl_buf_idx  = ( *smpl_buf_idx - 1 ) & DECISION_DELAY_MASK;                   /* Index to newest samples              */
+        last_smple_idx = ( *smpl_buf_idx + decisionDelay ) & DECISION_DELAY_MASK;       /* Index to decisionDelay old samples   */
+
+        /* Find winner */
+        RDmin_Q10 = psSampleState[ 0 ][ 0 ].RD_Q10;
+        Winner_ind = 0;
+        for( k = 1; k < nStatesDelayedDecision; k++ ) {
+            if( psSampleState[ k ][ 0 ].RD_Q10 < RDmin_Q10 ) {
+                RDmin_Q10  = psSampleState[ k ][ 0 ].RD_Q10;
+                Winner_ind = k;
+            }
+        }
+
+        /* Increase RD values of expired states */
+        Winner_rand_state = psDelDec[ Winner_ind ].RandState[ last_smple_idx ];
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            if( psDelDec[ k ].RandState[ last_smple_idx ] != Winner_rand_state ) {
+                psSampleState[ k ][ 0 ].RD_Q10 = silk_ADD32( psSampleState[ k ][ 0 ].RD_Q10, silk_int32_MAX >> 4 );
+                psSampleState[ k ][ 1 ].RD_Q10 = silk_ADD32( psSampleState[ k ][ 1 ].RD_Q10, silk_int32_MAX >> 4 );
+                silk_assert( psSampleState[ k ][ 0 ].RD_Q10 >= 0 );
+            }
+        }
+
+        /* Find worst in first set and best in second set */
+        RDmax_Q10  = psSampleState[ 0 ][ 0 ].RD_Q10;
+        RDmin_Q10  = psSampleState[ 0 ][ 1 ].RD_Q10;
+        RDmax_ind = 0;
+        RDmin_ind = 0;
+        for( k = 1; k < nStatesDelayedDecision; k++ ) {
+            /* find worst in first set */
+            if( psSampleState[ k ][ 0 ].RD_Q10 > RDmax_Q10 ) {
+                RDmax_Q10  = psSampleState[ k ][ 0 ].RD_Q10;
+                RDmax_ind = k;
+            }
+            /* find best in second set */
+            if( psSampleState[ k ][ 1 ].RD_Q10 < RDmin_Q10 ) {
+                RDmin_Q10  = psSampleState[ k ][ 1 ].RD_Q10;
+                RDmin_ind = k;
+            }
+        }
+
+        /* Replace a state if best from second set outperforms worst in first set */
+        if( RDmin_Q10 < RDmax_Q10 ) {
+            silk_memcpy( ( (opus_int32 *)&psDelDec[ RDmax_ind ] ) + i,
+                         ( (opus_int32 *)&psDelDec[ RDmin_ind ] ) + i, sizeof( NSQ_del_dec_struct ) - i * sizeof( opus_int32) );
+            silk_memcpy( &psSampleState[ RDmax_ind ][ 0 ], &psSampleState[ RDmin_ind ][ 1 ], sizeof( NSQ_sample_struct ) );
+        }
+
+        /* Write samples from winner to output and long-term filter states */
+        psDD = &psDelDec[ Winner_ind ];
+        if( subfr > 0 || i >= decisionDelay ) {
+            pulses[  i - decisionDelay ] = (opus_int8)silk_RSHIFT_ROUND( psDD->Q_Q10[ last_smple_idx ], 10 );
+            xq[ i - decisionDelay ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND(
+                silk_SMULWW( psDD->Xq_Q14[ last_smple_idx ], delayedGain_Q10[ last_smple_idx ] ), 8 ) );
+            NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - decisionDelay ] = psDD->Shape_Q14[ last_smple_idx ];
+            sLTP_Q15[          NSQ->sLTP_buf_idx     - decisionDelay ] = psDD->Pred_Q15[  last_smple_idx ];
+        }
+        NSQ->sLTP_shp_buf_idx++;
+        NSQ->sLTP_buf_idx++;
+
+        /* Update states */
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            psDD                                     = &psDelDec[ k ];
+            psSS                                     = &psSampleState[ k ][ 0 ];
+            psDD->LF_AR_Q14                          = psSS->LF_AR_Q14;
+            psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH + i ] = psSS->xq_Q14;
+            psDD->Xq_Q14[    *smpl_buf_idx ]         = psSS->xq_Q14;
+            psDD->Q_Q10[     *smpl_buf_idx ]         = psSS->Q_Q10;
+            psDD->Pred_Q15[  *smpl_buf_idx ]         = silk_LSHIFT32( psSS->LPC_exc_Q14, 1 );
+            psDD->Shape_Q14[ *smpl_buf_idx ]         = psSS->sLTP_shp_Q14;
+            psDD->Seed                               = silk_ADD32_ovflw( psDD->Seed, silk_RSHIFT_ROUND( psSS->Q_Q10, 10 ) );
+            psDD->RandState[ *smpl_buf_idx ]         = psDD->Seed;
+            psDD->RD_Q10                             = psSS->RD_Q10;
+        }
+        delayedGain_Q10[     *smpl_buf_idx ]         = Gain_Q10;
+    }
+    /* Update LPC states */
+    for( k = 0; k < nStatesDelayedDecision; k++ ) {
+        psDD = &psDelDec[ k ];
+        silk_memcpy( psDD->sLPC_Q14, &psDD->sLPC_Q14[ length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+    }
+    RESTORE_STACK;
+}
+
+static OPUS_INLINE void silk_nsq_del_dec_scale_states(
+    const silk_encoder_state *psEncC,               /* I    Encoder State                       */
+    silk_nsq_state      *NSQ,                       /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],                 /* I/O  Delayed decision states             */
+    const opus_int32    x_Q3[],                     /* I    Input in Q3                         */
+    opus_int32          x_sc_Q10[],                 /* O    Input scaled with 1/Gain in Q10     */
+    const opus_int16    sLTP[],                     /* I    Re-whitened LTP state in Q0         */
+    opus_int32          sLTP_Q15[],                 /* O    LTP state matching scaled input     */
+    opus_int            subfr,                      /* I    Subframe number                     */
+    opus_int            nStatesDelayedDecision,     /* I    Number of del dec states            */
+    const opus_int      LTP_scale_Q14,              /* I    LTP state scaling                   */
+    const opus_int32    Gains_Q16[ MAX_NB_SUBFR ],  /* I                                        */
+    const opus_int      pitchL[ MAX_NB_SUBFR ],     /* I    Pitch lag                           */
+    const opus_int      signal_type,                /* I    Signal type                         */
+    const opus_int      decisionDelay               /* I    Decision delay                      */
+)
+{
+    opus_int            i, k, lag;
+    opus_int32          gain_adj_Q16, inv_gain_Q31, inv_gain_Q23;
+    NSQ_del_dec_struct  *psDD;
+
+    lag          = pitchL[ subfr ];
+    inv_gain_Q31 = silk_INVERSE32_varQ( silk_max( Gains_Q16[ subfr ], 1 ), 47 );
+    silk_assert( inv_gain_Q31 != 0 );
+
+    /* Calculate gain adjustment factor */
+    if( Gains_Q16[ subfr ] != NSQ->prev_gain_Q16 ) {
+        gain_adj_Q16 =  silk_DIV32_varQ( NSQ->prev_gain_Q16, Gains_Q16[ subfr ], 16 );
+    } else {
+        gain_adj_Q16 = (opus_int32)1 << 16;
+    }
+
+    /* Scale input */
+    inv_gain_Q23 = silk_RSHIFT_ROUND( inv_gain_Q31, 8 );
+    for( i = 0; i < psEncC->subfr_length; i++ ) {
+        x_sc_Q10[ i ] = silk_SMULWW( x_Q3[ i ], inv_gain_Q23 );
+    }
+
+    /* Save inverse gain */
+    NSQ->prev_gain_Q16 = Gains_Q16[ subfr ];
+
+    /* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16 */
+    if( NSQ->rewhite_flag ) {
+        if( subfr == 0 ) {
+            /* Do LTP downscaling */
+            inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, LTP_scale_Q14 ), 2 );
+        }
+        for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
+            silk_assert( i < MAX_FRAME_LENGTH );
+            sLTP_Q15[ i ] = silk_SMULWB( inv_gain_Q31, sLTP[ i ] );
+        }
+    }
+
+    /* Adjust for changing gain */
+    if( gain_adj_Q16 != (opus_int32)1 << 16 ) {
+        /* Scale long-term shaping state */
+        for( i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_shp_buf_idx; i++ ) {
+            NSQ->sLTP_shp_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLTP_shp_Q14[ i ] );
+        }
+
+        /* Scale long-term prediction state */
+        if( signal_type == TYPE_VOICED && NSQ->rewhite_flag == 0 ) {
+            for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx - decisionDelay; i++ ) {
+                sLTP_Q15[ i ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ i ] );
+            }
+        }
+
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            psDD = &psDelDec[ k ];
+
+            /* Scale scalar states */
+            psDD->LF_AR_Q14 = silk_SMULWW( gain_adj_Q16, psDD->LF_AR_Q14 );
+
+            /* Scale short-term prediction and shaping states */
+            for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) {
+                psDD->sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->sLPC_Q14[ i ] );
+            }
+            for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) {
+                psDD->sAR2_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->sAR2_Q14[ i ] );
+            }
+            for( i = 0; i < DECISION_DELAY; i++ ) {
+                psDD->Pred_Q15[  i ] = silk_SMULWW( gain_adj_Q16, psDD->Pred_Q15[  i ] );
+                psDD->Shape_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->Shape_Q14[ i ] );
+            }
+        }
+    }
+}
diff --git a/drivers/opus/silk/PLC.c b/drivers/opus/silk/PLC.c
new file mode 100644
index 0000000000..9fc11adda9
--- /dev/null
+++ b/drivers/opus/silk/PLC.c
@@ -0,0 +1,423 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+#include "PLC.h"
+
+#define NB_ATT 2
+static const opus_int16 HARM_ATT_Q15[NB_ATT]              = { 32440, 31130 }; /* 0.99, 0.95 */
+static const opus_int16 PLC_RAND_ATTENUATE_V_Q15[NB_ATT]  = { 31130, 26214 }; /* 0.95, 0.8 */
+static const opus_int16 PLC_RAND_ATTENUATE_UV_Q15[NB_ATT] = { 32440, 29491 }; /* 0.99, 0.9 */
+
+static OPUS_INLINE void silk_PLC_update(
+    silk_decoder_state                  *psDec,             /* I/O Decoder state        */
+    silk_decoder_control                *psDecCtrl          /* I/O Decoder control      */
+);
+
+static OPUS_INLINE void silk_PLC_conceal(
+    silk_decoder_state                  *psDec,             /* I/O Decoder state        */
+    silk_decoder_control                *psDecCtrl,         /* I/O Decoder control      */
+    opus_int16                          frame[]             /* O LPC residual signal    */
+);
+
+
+void silk_PLC_Reset(
+    silk_decoder_state                  *psDec              /* I/O Decoder state        */
+)
+{
+    psDec->sPLC.pitchL_Q8 = silk_LSHIFT( psDec->frame_length, 8 - 1 );
+    psDec->sPLC.prevGain_Q16[ 0 ] = SILK_FIX_CONST( 1, 16 );
+    psDec->sPLC.prevGain_Q16[ 1 ] = SILK_FIX_CONST( 1, 16 );
+    psDec->sPLC.subfr_length = 20;
+    psDec->sPLC.nb_subfr = 2;
+}
+
+void silk_PLC(
+    silk_decoder_state                  *psDec,             /* I/O Decoder state        */
+    silk_decoder_control                *psDecCtrl,         /* I/O Decoder control      */
+    opus_int16                          frame[],            /* I/O  signal              */
+    opus_int                            lost                /* I Loss flag              */
+)
+{
+    /* PLC control function */
+    if( psDec->fs_kHz != psDec->sPLC.fs_kHz ) {
+        silk_PLC_Reset( psDec );
+        psDec->sPLC.fs_kHz = psDec->fs_kHz;
+    }
+
+    if( lost ) {
+        /****************************/
+        /* Generate Signal          */
+        /****************************/
+        silk_PLC_conceal( psDec, psDecCtrl, frame );
+
+        psDec->lossCnt++;
+    } else {
+        /****************************/
+        /* Update state             */
+        /****************************/
+        silk_PLC_update( psDec, psDecCtrl );
+    }
+}
+
+/**************************************************/
+/* Update state of PLC                            */
+/**************************************************/
+static OPUS_INLINE void silk_PLC_update(
+    silk_decoder_state                  *psDec,             /* I/O Decoder state        */
+    silk_decoder_control                *psDecCtrl          /* I/O Decoder control      */
+)
+{
+    opus_int32 LTP_Gain_Q14, temp_LTP_Gain_Q14;
+    opus_int   i, j;
+    silk_PLC_struct *psPLC;
+
+    psPLC = &psDec->sPLC;
+
+    /* Update parameters used in case of packet loss */
+    psDec->prevSignalType = psDec->indices.signalType;
+    LTP_Gain_Q14 = 0;
+    if( psDec->indices.signalType == TYPE_VOICED ) {
+        /* Find the parameters for the last subframe which contains a pitch pulse */
+        for( j = 0; j * psDec->subfr_length < psDecCtrl->pitchL[ psDec->nb_subfr - 1 ]; j++ ) {
+            if( j == psDec->nb_subfr ) {
+                break;
+            }
+            temp_LTP_Gain_Q14 = 0;
+            for( i = 0; i < LTP_ORDER; i++ ) {
+                temp_LTP_Gain_Q14 += psDecCtrl->LTPCoef_Q14[ ( psDec->nb_subfr - 1 - j ) * LTP_ORDER  + i ];
+            }
+            if( temp_LTP_Gain_Q14 > LTP_Gain_Q14 ) {
+                LTP_Gain_Q14 = temp_LTP_Gain_Q14;
+                silk_memcpy( psPLC->LTPCoef_Q14,
+                    &psDecCtrl->LTPCoef_Q14[ silk_SMULBB( psDec->nb_subfr - 1 - j, LTP_ORDER ) ],
+                    LTP_ORDER * sizeof( opus_int16 ) );
+
+                psPLC->pitchL_Q8 = silk_LSHIFT( psDecCtrl->pitchL[ psDec->nb_subfr - 1 - j ], 8 );
+            }
+        }
+
+        silk_memset( psPLC->LTPCoef_Q14, 0, LTP_ORDER * sizeof( opus_int16 ) );
+        psPLC->LTPCoef_Q14[ LTP_ORDER / 2 ] = LTP_Gain_Q14;
+
+        /* Limit LT coefs */
+        if( LTP_Gain_Q14 < V_PITCH_GAIN_START_MIN_Q14 ) {
+            opus_int   scale_Q10;
+            opus_int32 tmp;
+
+            tmp = silk_LSHIFT( V_PITCH_GAIN_START_MIN_Q14, 10 );
+            scale_Q10 = silk_DIV32( tmp, silk_max( LTP_Gain_Q14, 1 ) );
+            for( i = 0; i < LTP_ORDER; i++ ) {
+                psPLC->LTPCoef_Q14[ i ] = silk_RSHIFT( silk_SMULBB( psPLC->LTPCoef_Q14[ i ], scale_Q10 ), 10 );
+            }
+        } else if( LTP_Gain_Q14 > V_PITCH_GAIN_START_MAX_Q14 ) {
+            opus_int   scale_Q14;
+            opus_int32 tmp;
+
+            tmp = silk_LSHIFT( V_PITCH_GAIN_START_MAX_Q14, 14 );
+            scale_Q14 = silk_DIV32( tmp, silk_max( LTP_Gain_Q14, 1 ) );
+            for( i = 0; i < LTP_ORDER; i++ ) {
+                psPLC->LTPCoef_Q14[ i ] = silk_RSHIFT( silk_SMULBB( psPLC->LTPCoef_Q14[ i ], scale_Q14 ), 14 );
+            }
+        }
+    } else {
+        psPLC->pitchL_Q8 = silk_LSHIFT( silk_SMULBB( psDec->fs_kHz, 18 ), 8 );
+        silk_memset( psPLC->LTPCoef_Q14, 0, LTP_ORDER * sizeof( opus_int16 ));
+    }
+
+    /* Save LPC coeficients */
+    silk_memcpy( psPLC->prevLPC_Q12, psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
+    psPLC->prevLTP_scale_Q14 = psDecCtrl->LTP_scale_Q14;
+
+    /* Save last two gains */
+    silk_memcpy( psPLC->prevGain_Q16, &psDecCtrl->Gains_Q16[ psDec->nb_subfr - 2 ], 2 * sizeof( opus_int32 ) );
+
+    psPLC->subfr_length = psDec->subfr_length;
+    psPLC->nb_subfr = psDec->nb_subfr;
+}
+
+static OPUS_INLINE void silk_PLC_conceal(
+    silk_decoder_state                  *psDec,             /* I/O Decoder state        */
+    silk_decoder_control                *psDecCtrl,         /* I/O Decoder control      */
+    opus_int16                          frame[]             /* O LPC residual signal    */
+)
+{
+    opus_int   i, j, k;
+    opus_int   lag, idx, sLTP_buf_idx, shift1, shift2;
+    opus_int32 rand_seed, harm_Gain_Q15, rand_Gain_Q15, inv_gain_Q30;
+    opus_int32 energy1, energy2, *rand_ptr, *pred_lag_ptr;
+    opus_int32 LPC_pred_Q10, LTP_pred_Q12;
+    opus_int16 rand_scale_Q14;
+    opus_int16 *B_Q14, *exc_buf_ptr;
+    opus_int32 *sLPC_Q14_ptr;
+    VARDECL( opus_int16, exc_buf );
+    opus_int16 A_Q12[ MAX_LPC_ORDER ];
+    VARDECL( opus_int16, sLTP );
+    VARDECL( opus_int32, sLTP_Q14 );
+    silk_PLC_struct *psPLC = &psDec->sPLC;
+    opus_int32 prevGain_Q10[2];
+    SAVE_STACK;
+
+    ALLOC( exc_buf, 2*psPLC->subfr_length, opus_int16 );
+    ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 );
+    ALLOC( sLTP_Q14, psDec->ltp_mem_length + psDec->frame_length, opus_int32 );
+
+    prevGain_Q10[0] = silk_RSHIFT( psPLC->prevGain_Q16[ 0 ], 6);
+    prevGain_Q10[1] = silk_RSHIFT( psPLC->prevGain_Q16[ 1 ], 6);
+
+    if( psDec->first_frame_after_reset ) {
+       silk_memset( psPLC->prevLPC_Q12, 0, sizeof( psPLC->prevLPC_Q12 ) );
+    }
+
+    /* Find random noise component */
+    /* Scale previous excitation signal */
+    exc_buf_ptr = exc_buf;
+    for( k = 0; k < 2; k++ ) {
+        for( i = 0; i < psPLC->subfr_length; i++ ) {
+            exc_buf_ptr[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT(
+                silk_SMULWW( psDec->exc_Q14[ i + ( k + psPLC->nb_subfr - 2 ) * psPLC->subfr_length ], prevGain_Q10[ k ] ), 8 ) );
+        }
+        exc_buf_ptr += psPLC->subfr_length;
+    }
+    /* Find the subframe with lowest energy of the last two and use that as random noise generator */
+    silk_sum_sqr_shift( &energy1, &shift1, exc_buf,                         psPLC->subfr_length );
+    silk_sum_sqr_shift( &energy2, &shift2, &exc_buf[ psPLC->subfr_length ], psPLC->subfr_length );
+
+    if( silk_RSHIFT( energy1, shift2 ) < silk_RSHIFT( energy2, shift1 ) ) {
+        /* First sub-frame has lowest energy */
+        rand_ptr = &psDec->exc_Q14[ silk_max_int( 0, ( psPLC->nb_subfr - 1 ) * psPLC->subfr_length - RAND_BUF_SIZE ) ];
+    } else {
+        /* Second sub-frame has lowest energy */
+        rand_ptr = &psDec->exc_Q14[ silk_max_int( 0, psPLC->nb_subfr * psPLC->subfr_length - RAND_BUF_SIZE ) ];
+    }
+
+    /* Set up Gain to random noise component */
+    B_Q14          = psPLC->LTPCoef_Q14;
+    rand_scale_Q14 = psPLC->randScale_Q14;
+
+    /* Set up attenuation gains */
+    harm_Gain_Q15 = HARM_ATT_Q15[ silk_min_int( NB_ATT - 1, psDec->lossCnt ) ];
+    if( psDec->prevSignalType == TYPE_VOICED ) {
+        rand_Gain_Q15 = PLC_RAND_ATTENUATE_V_Q15[  silk_min_int( NB_ATT - 1, psDec->lossCnt ) ];
+    } else {
+        rand_Gain_Q15 = PLC_RAND_ATTENUATE_UV_Q15[ silk_min_int( NB_ATT - 1, psDec->lossCnt ) ];
+    }
+
+    /* LPC concealment. Apply BWE to previous LPC */
+    silk_bwexpander( psPLC->prevLPC_Q12, psDec->LPC_order, SILK_FIX_CONST( BWE_COEF, 16 ) );
+
+    /* Preload LPC coeficients to array on stack. Gives small performance gain */
+    silk_memcpy( A_Q12, psPLC->prevLPC_Q12, psDec->LPC_order * sizeof( opus_int16 ) );
+
+    /* First Lost frame */
+    if( psDec->lossCnt == 0 ) {
+        rand_scale_Q14 = 1 << 14;
+
+        /* Reduce random noise Gain for voiced frames */
+        if( psDec->prevSignalType == TYPE_VOICED ) {
+            for( i = 0; i < LTP_ORDER; i++ ) {
+                rand_scale_Q14 -= B_Q14[ i ];
+            }
+            rand_scale_Q14 = silk_max_16( 3277, rand_scale_Q14 ); /* 0.2 */
+            rand_scale_Q14 = (opus_int16)silk_RSHIFT( silk_SMULBB( rand_scale_Q14, psPLC->prevLTP_scale_Q14 ), 14 );
+        } else {
+            /* Reduce random noise for unvoiced frames with high LPC gain */
+            opus_int32 invGain_Q30, down_scale_Q30;
+
+            invGain_Q30 = silk_LPC_inverse_pred_gain( psPLC->prevLPC_Q12, psDec->LPC_order );
+
+            down_scale_Q30 = silk_min_32( silk_RSHIFT( (opus_int32)1 << 30, LOG2_INV_LPC_GAIN_HIGH_THRES ), invGain_Q30 );
+            down_scale_Q30 = silk_max_32( silk_RSHIFT( (opus_int32)1 << 30, LOG2_INV_LPC_GAIN_LOW_THRES ), down_scale_Q30 );
+            down_scale_Q30 = silk_LSHIFT( down_scale_Q30, LOG2_INV_LPC_GAIN_HIGH_THRES );
+
+            rand_Gain_Q15 = silk_RSHIFT( silk_SMULWB( down_scale_Q30, rand_Gain_Q15 ), 14 );
+        }
+    }
+
+    rand_seed    = psPLC->rand_seed;
+    lag          = silk_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 );
+    sLTP_buf_idx = psDec->ltp_mem_length;
+
+    /* Rewhiten LTP state */
+    idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2;
+    silk_assert( idx > 0 );
+    silk_LPC_analysis_filter( &sLTP[ idx ], &psDec->outBuf[ idx ], A_Q12, psDec->ltp_mem_length - idx, psDec->LPC_order );
+    /* Scale LTP state */
+    inv_gain_Q30 = silk_INVERSE32_varQ( psPLC->prevGain_Q16[ 1 ], 46 );
+    inv_gain_Q30 = silk_min( inv_gain_Q30, silk_int32_MAX >> 1 );
+    for( i = idx + psDec->LPC_order; i < psDec->ltp_mem_length; i++ ) {
+        sLTP_Q14[ i ] = silk_SMULWB( inv_gain_Q30, sLTP[ i ] );
+    }
+
+    /***************************/
+    /* LTP synthesis filtering */
+    /***************************/
+    for( k = 0; k < psDec->nb_subfr; k++ ) {
+        /* Set up pointer */
+        pred_lag_ptr = &sLTP_Q14[ sLTP_buf_idx - lag + LTP_ORDER / 2 ];
+        for( i = 0; i < psDec->subfr_length; i++ ) {
+            /* Unrolled loop */
+            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+            LTP_pred_Q12 = 2;
+            LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[  0 ], B_Q14[ 0 ] );
+            LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -1 ], B_Q14[ 1 ] );
+            LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -2 ], B_Q14[ 2 ] );
+            LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -3 ], B_Q14[ 3 ] );
+            LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -4 ], B_Q14[ 4 ] );
+            pred_lag_ptr++;
+
+            /* Generate LPC excitation */
+            rand_seed = silk_RAND( rand_seed );
+            idx = silk_RSHIFT( rand_seed, 25 ) & RAND_BUF_MASK;
+            sLTP_Q14[ sLTP_buf_idx ] = silk_LSHIFT32( silk_SMLAWB( LTP_pred_Q12, rand_ptr[ idx ], rand_scale_Q14 ), 2 );
+            sLTP_buf_idx++;
+        }
+
+        /* Gradually reduce LTP gain */
+        for( j = 0; j < LTP_ORDER; j++ ) {
+            B_Q14[ j ] = silk_RSHIFT( silk_SMULBB( harm_Gain_Q15, B_Q14[ j ] ), 15 );
+        }
+        /* Gradually reduce excitation gain */
+        rand_scale_Q14 = silk_RSHIFT( silk_SMULBB( rand_scale_Q14, rand_Gain_Q15 ), 15 );
+
+        /* Slowly increase pitch lag */
+        psPLC->pitchL_Q8 = silk_SMLAWB( psPLC->pitchL_Q8, psPLC->pitchL_Q8, PITCH_DRIFT_FAC_Q16 );
+        psPLC->pitchL_Q8 = silk_min_32( psPLC->pitchL_Q8, silk_LSHIFT( silk_SMULBB( MAX_PITCH_LAG_MS, psDec->fs_kHz ), 8 ) );
+        lag = silk_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 );
+    }
+
+    /***************************/
+    /* LPC synthesis filtering */
+    /***************************/
+    sLPC_Q14_ptr = &sLTP_Q14[ psDec->ltp_mem_length - MAX_LPC_ORDER ];
+
+    /* Copy LPC state */
+    silk_memcpy( sLPC_Q14_ptr, psDec->sLPC_Q14_buf, MAX_LPC_ORDER * sizeof( opus_int32 ) );
+
+    silk_assert( psDec->LPC_order >= 10 ); /* check that unrolling works */
+    for( i = 0; i < psDec->frame_length; i++ ) {
+        /* partly unrolled */
+        /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+        LPC_pred_Q10 = silk_RSHIFT( psDec->LPC_order, 1 );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  1 ], A_Q12[ 0 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  2 ], A_Q12[ 1 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  3 ], A_Q12[ 2 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  4 ], A_Q12[ 3 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  5 ], A_Q12[ 4 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  6 ], A_Q12[ 5 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  7 ], A_Q12[ 6 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  8 ], A_Q12[ 7 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i -  9 ], A_Q12[ 8 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 10 ], A_Q12[ 9 ] );
+        for( j = 10; j < psDec->LPC_order; j++ ) {
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - j - 1 ], A_Q12[ j ] );
+        }
+
+        /* Add prediction to LPC excitation */
+        sLPC_Q14_ptr[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT32( sLPC_Q14_ptr[ MAX_LPC_ORDER + i ], LPC_pred_Q10, 4 );
+
+        /* Scale with Gain */
+        frame[ i ] = (opus_int16)silk_SAT16( silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14_ptr[ MAX_LPC_ORDER + i ], prevGain_Q10[ 1 ] ), 8 ) ) );
+    }
+
+    /* Save LPC state */
+    silk_memcpy( psDec->sLPC_Q14_buf, &sLPC_Q14_ptr[ psDec->frame_length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
+
+    /**************************************/
+    /* Update states                      */
+    /**************************************/
+    psPLC->rand_seed     = rand_seed;
+    psPLC->randScale_Q14 = rand_scale_Q14;
+    for( i = 0; i < MAX_NB_SUBFR; i++ ) {
+        psDecCtrl->pitchL[ i ] = lag;
+    }
+    RESTORE_STACK;
+}
+
+/* Glues concealed frames with new good received frames */
+void silk_PLC_glue_frames(
+    silk_decoder_state                  *psDec,             /* I/O decoder state        */
+    opus_int16                          frame[],            /* I/O signal               */
+    opus_int                            length              /* I length of signal       */
+)
+{
+    opus_int   i, energy_shift;
+    opus_int32 energy;
+    silk_PLC_struct *psPLC;
+    psPLC = &psDec->sPLC;
+
+    if( psDec->lossCnt ) {
+        /* Calculate energy in concealed residual */
+        silk_sum_sqr_shift( &psPLC->conc_energy, &psPLC->conc_energy_shift, frame, length );
+
+        psPLC->last_frame_lost = 1;
+    } else {
+        if( psDec->sPLC.last_frame_lost ) {
+            /* Calculate residual in decoded signal if last frame was lost */
+            silk_sum_sqr_shift( &energy, &energy_shift, frame, length );
+
+            /* Normalize energies */
+            if( energy_shift > psPLC->conc_energy_shift ) {
+                psPLC->conc_energy = silk_RSHIFT( psPLC->conc_energy, energy_shift - psPLC->conc_energy_shift );
+            } else if( energy_shift < psPLC->conc_energy_shift ) {
+                energy = silk_RSHIFT( energy, psPLC->conc_energy_shift - energy_shift );
+            }
+
+            /* Fade in the energy difference */
+            if( energy > psPLC->conc_energy ) {
+                opus_int32 frac_Q24, LZ;
+                opus_int32 gain_Q16, slope_Q16;
+
+                LZ = silk_CLZ32( psPLC->conc_energy );
+                LZ = LZ - 1;
+                psPLC->conc_energy = silk_LSHIFT( psPLC->conc_energy, LZ );
+                energy = silk_RSHIFT( energy, silk_max_32( 24 - LZ, 0 ) );
+
+                frac_Q24 = silk_DIV32( psPLC->conc_energy, silk_max( energy, 1 ) );
+
+                gain_Q16 = silk_LSHIFT( silk_SQRT_APPROX( frac_Q24 ), 4 );
+                slope_Q16 = silk_DIV32_16( ( (opus_int32)1 << 16 ) - gain_Q16, length );
+                /* Make slope 4x steeper to avoid missing onsets after DTX */
+                slope_Q16 = silk_LSHIFT( slope_Q16, 2 );
+
+                for( i = 0; i < length; i++ ) {
+                    frame[ i ] = silk_SMULWB( gain_Q16, frame[ i ] );
+                    gain_Q16 += slope_Q16;
+                    if( gain_Q16 > (opus_int32)1 << 16 ) {
+                        break;
+                    }
+                }
+            }
+        }
+        psPLC->last_frame_lost = 0;
+    }
+}
diff --git a/drivers/opus/silk/PLC.h b/drivers/opus/silk/PLC.h
new file mode 100644
index 0000000000..f531cda950
--- /dev/null
+++ b/drivers/opus/silk/PLC.h
@@ -0,0 +1,61 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_PLC_H
+#define SILK_PLC_H
+
+#include "silk_main.h"
+
+#define BWE_COEF                        0.99
+#define V_PITCH_GAIN_START_MIN_Q14      11469               /* 0.7 in Q14               */
+#define V_PITCH_GAIN_START_MAX_Q14      15565               /* 0.95 in Q14              */
+#define MAX_PITCH_LAG_MS                18
+#define RAND_BUF_SIZE                   128
+#define RAND_BUF_MASK                   ( RAND_BUF_SIZE - 1 )
+#define LOG2_INV_LPC_GAIN_HIGH_THRES    3                   /* 2^3 = 8 dB LPC gain      */
+#define LOG2_INV_LPC_GAIN_LOW_THRES     8                   /* 2^8 = 24 dB LPC gain     */
+#define PITCH_DRIFT_FAC_Q16             655                 /* 0.01 in Q16              */
+
+void silk_PLC_Reset(
+    silk_decoder_state                  *psDec              /* I/O Decoder state        */
+);
+
+void silk_PLC(
+    silk_decoder_state                  *psDec,             /* I/O Decoder state        */
+    silk_decoder_control                *psDecCtrl,         /* I/O Decoder control      */
+    opus_int16                          frame[],            /* I/O  signal              */
+    opus_int                            lost                /* I Loss flag              */
+);
+
+void silk_PLC_glue_frames(
+    silk_decoder_state                  *psDec,             /* I/O decoder state        */
+    opus_int16                          frame[],            /* I/O signal               */
+    opus_int                            length              /* I length of signal       */
+);
+
+#endif
+
diff --git a/drivers/opus/silk/SigProc_FIX.h b/drivers/opus/silk/SigProc_FIX.h
new file mode 100644
index 0000000000..1b58057910
--- /dev/null
+++ b/drivers/opus/silk/SigProc_FIX.h
@@ -0,0 +1,594 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_SIGPROC_FIX_H
+#define SILK_SIGPROC_FIX_H
+
+#ifdef  __cplusplus
+extern "C"
+{
+#endif
+
+/*#define silk_MACRO_COUNT */          /* Used to enable WMOPS counting */
+
+#define SILK_MAX_ORDER_LPC            16            /* max order of the LPC analysis in schur() and k2a() */
+
+#include <string.h>                                 /* for memset(), memcpy(), memmove() */
+#include "typedef.h"
+#include "resampler_structs.h"
+#include "macros.h"
+
+
+/********************************************************************/
+/*                    SIGNAL PROCESSING FUNCTIONS                   */
+/********************************************************************/
+
+/*!
+ * Initialize/reset the resampler state for a given pair of input/output sampling rates
+*/
+opus_int silk_resampler_init(
+    silk_resampler_state_struct *S,                 /* I/O  Resampler state                                             */
+    opus_int32                  Fs_Hz_in,           /* I    Input sampling rate (Hz)                                    */
+    opus_int32                  Fs_Hz_out,          /* I    Output sampling rate (Hz)                                   */
+    opus_int                    forEnc              /* I    If 1: encoder; if 0: decoder                                */
+);
+
+/*!
+ * Resampler: convert from one sampling rate to another
+ */
+opus_int silk_resampler(
+    silk_resampler_state_struct *S,                 /* I/O  Resampler state                                             */
+    opus_int16                  out[],              /* O    Output signal                                               */
+    const opus_int16            in[],               /* I    Input signal                                                */
+    opus_int32                  inLen               /* I    Number of input samples                                     */
+);
+
+/*!
+* Downsample 2x, mediocre quality
+*/
+void silk_resampler_down2(
+    opus_int32                  *S,                 /* I/O  State vector [ 2 ]                                          */
+    opus_int16                  *out,               /* O    Output signal [ len ]                                       */
+    const opus_int16            *in,                /* I    Input signal [ floor(len/2) ]                               */
+    opus_int32                  inLen               /* I    Number of input samples                                     */
+);
+
+/*!
+ * Downsample by a factor 2/3, low quality
+*/
+void silk_resampler_down2_3(
+    opus_int32                  *S,                 /* I/O  State vector [ 6 ]                                          */
+    opus_int16                  *out,               /* O    Output signal [ floor(2*inLen/3) ]                          */
+    const opus_int16            *in,                /* I    Input signal [ inLen ]                                      */
+    opus_int32                  inLen               /* I    Number of input samples                                     */
+);
+
+/*!
+ * second order ARMA filter;
+ * slower than biquad() but uses more precise coefficients
+ * can handle (slowly) varying coefficients
+ */
+void silk_biquad_alt(
+    const opus_int16            *in,                /* I     input signal                                               */
+    const opus_int32            *B_Q28,             /* I     MA coefficients [3]                                        */
+    const opus_int32            *A_Q28,             /* I     AR coefficients [2]                                        */
+    opus_int32                  *S,                 /* I/O   State vector [2]                                           */
+    opus_int16                  *out,               /* O     output signal                                              */
+    const opus_int32            len,                /* I     signal length (must be even)                               */
+    opus_int                    stride              /* I     Operate on interleaved signal if > 1                       */
+);
+
+/* Variable order MA prediction error filter. */
+void silk_LPC_analysis_filter(
+    opus_int16                  *out,               /* O    Output signal                                               */
+    const opus_int16            *in,                /* I    Input signal                                                */
+    const opus_int16            *B,                 /* I    MA prediction coefficients, Q12 [order]                     */
+    const opus_int32            len,                /* I    Signal length                                               */
+    const opus_int32            d                   /* I    Filter order                                                */
+);
+
+/* Chirp (bandwidth expand) LP AR filter */
+void silk_bwexpander(
+    opus_int16                  *ar,                /* I/O  AR filter to be expanded (without leading 1)                */
+    const opus_int              d,                  /* I    Length of ar                                                */
+    opus_int32                  chirp_Q16           /* I    Chirp factor (typically in the range 0 to 1)                */
+);
+
+/* Chirp (bandwidth expand) LP AR filter */
+void silk_bwexpander_32(
+    opus_int32                  *ar,                /* I/O  AR filter to be expanded (without leading 1)                */
+    const opus_int              d,                  /* I    Length of ar                                                */
+    opus_int32                  chirp_Q16           /* I    Chirp factor in Q16                                         */
+);
+
+/* Compute inverse of LPC prediction gain, and                           */
+/* test if LPC coefficients are stable (all poles within unit circle)    */
+opus_int32 silk_LPC_inverse_pred_gain(              /* O   Returns inverse prediction gain in energy domain, Q30        */
+    const opus_int16            *A_Q12,             /* I   Prediction coefficients, Q12 [order]                         */
+    const opus_int              order               /* I   Prediction order                                             */
+);
+
+/* For input in Q24 domain */
+opus_int32 silk_LPC_inverse_pred_gain_Q24(          /* O    Returns inverse prediction gain in energy domain, Q30       */
+    const opus_int32            *A_Q24,             /* I    Prediction coefficients [order]                             */
+    const opus_int              order               /* I    Prediction order                                            */
+);
+
+/* Split signal in two decimated bands using first-order allpass filters */
+void silk_ana_filt_bank_1(
+    const opus_int16            *in,                /* I    Input signal [N]                                            */
+    opus_int32                  *S,                 /* I/O  State vector [2]                                            */
+    opus_int16                  *outL,              /* O    Low band [N/2]                                              */
+    opus_int16                  *outH,              /* O    High band [N/2]                                             */
+    const opus_int32            N                   /* I    Number of input samples                                     */
+);
+
+/********************************************************************/
+/*                        SCALAR FUNCTIONS                          */
+/********************************************************************/
+
+/* Approximation of 128 * log2() (exact inverse of approx 2^() below) */
+/* Convert input to a log scale    */
+opus_int32 silk_lin2log(
+    const opus_int32            inLin               /* I  input in linear scale                                         */
+);
+
+/* Approximation of a sigmoid function */
+opus_int silk_sigm_Q15(
+    opus_int                    in_Q5               /* I                                                                */
+);
+
+/* Approximation of 2^() (exact inverse of approx log2() above) */
+/* Convert input to a linear scale */
+opus_int32 silk_log2lin(
+    const opus_int32            inLog_Q7            /* I  input on log scale                                            */
+);
+
+/* Compute number of bits to right shift the sum of squares of a vector    */
+/* of int16s to make it fit in an int32                                    */
+void silk_sum_sqr_shift(
+    opus_int32                  *energy,            /* O   Energy of x, after shifting to the right                     */
+    opus_int                    *shift,             /* O   Number of bits right shift applied to energy                 */
+    const opus_int16            *x,                 /* I   Input vector                                                 */
+    opus_int                    len                 /* I   Length of input vector                                       */
+);
+
+/* Calculates the reflection coefficients from the correlation sequence    */
+/* Faster than schur64(), but much less accurate.                          */
+/* uses SMLAWB(), requiring armv5E and higher.                             */
+opus_int32 silk_schur(                              /* O    Returns residual energy                                     */
+    opus_int16                  *rc_Q15,            /* O    reflection coefficients [order] Q15                         */
+    const opus_int32            *c,                 /* I    correlations [order+1]                                      */
+    const opus_int32            order               /* I    prediction order                                            */
+);
+
+/* Calculates the reflection coefficients from the correlation sequence    */
+/* Slower than schur(), but more accurate.                                 */
+/* Uses SMULL(), available on armv4                                        */
+opus_int32 silk_schur64(                            /* O    returns residual energy                                     */
+    opus_int32                  rc_Q16[],           /* O    Reflection coefficients [order] Q16                         */
+    const opus_int32            c[],                /* I    Correlations [order+1]                                      */
+    opus_int32                  order               /* I    Prediction order                                            */
+);
+
+/* Step up function, converts reflection coefficients to prediction coefficients */
+void silk_k2a(
+    opus_int32                  *A_Q24,             /* O    Prediction coefficients [order] Q24                         */
+    const opus_int16            *rc_Q15,            /* I    Reflection coefficients [order] Q15                         */
+    const opus_int32            order               /* I    Prediction order                                            */
+);
+
+/* Step up function, converts reflection coefficients to prediction coefficients */
+void silk_k2a_Q16(
+    opus_int32                  *A_Q24,             /* O    Prediction coefficients [order] Q24                         */
+    const opus_int32            *rc_Q16,            /* I    Reflection coefficients [order] Q16                         */
+    const opus_int32            order               /* I    Prediction order                                            */
+);
+
+/* Apply sine window to signal vector.                              */
+/* Window types:                                                    */
+/*    1 -> sine window from 0 to pi/2                               */
+/*    2 -> sine window from pi/2 to pi                              */
+/* every other sample of window is linearly interpolated, for speed */
+void silk_apply_sine_window(
+    opus_int16                  px_win[],           /* O    Pointer to windowed signal                                  */
+    const opus_int16            px[],               /* I    Pointer to input signal                                     */
+    const opus_int              win_type,           /* I    Selects a window type                                       */
+    const opus_int              length              /* I    Window length, multiple of 4                                */
+);
+
+/* Compute autocorrelation */
+void silk_autocorr(
+    opus_int32                  *results,           /* O    Result (length correlationCount)                            */
+    opus_int                    *scale,             /* O    Scaling of the correlation vector                           */
+    const opus_int16            *inputData,         /* I    Input data to correlate                                     */
+    const opus_int              inputDataSize,      /* I    Length of input                                             */
+    const opus_int              correlationCount,   /* I    Number of correlation taps to compute                       */
+    int                         arch                /* I    Run-time architecture                                       */
+);
+
+void silk_decode_pitch(
+    opus_int16                  lagIndex,           /* I                                                                */
+    opus_int8                   contourIndex,       /* O                                                                */
+    opus_int                    pitch_lags[],       /* O    4 pitch values                                              */
+    const opus_int              Fs_kHz,             /* I    sampling frequency (kHz)                                    */
+    const opus_int              nb_subfr            /* I    number of sub frames                                        */
+);
+
+opus_int silk_pitch_analysis_core(                  /* O    Voicing estimate: 0 voiced, 1 unvoiced                      */
+    const opus_int16            *frame,             /* I    Signal of length PE_FRAME_LENGTH_MS*Fs_kHz                  */
+    opus_int                    *pitch_out,         /* O    4 pitch lag values                                          */
+    opus_int16                  *lagIndex,          /* O    Lag Index                                                   */
+    opus_int8                   *contourIndex,      /* O    Pitch contour Index                                         */
+    opus_int                    *LTPCorr_Q15,       /* I/O  Normalized correlation; input: value from previous frame    */
+    opus_int                    prevLag,            /* I    Last lag of previous frame; set to zero is unvoiced         */
+    const opus_int32            search_thres1_Q16,  /* I    First stage threshold for lag candidates 0 - 1              */
+    const opus_int              search_thres2_Q13,  /* I    Final threshold for lag candidates 0 - 1                    */
+    const opus_int              Fs_kHz,             /* I    Sample frequency (kHz)                                      */
+    const opus_int              complexity,         /* I    Complexity setting, 0-2, where 2 is highest                 */
+    const opus_int              nb_subfr,           /* I    number of 5 ms subframes                                    */
+    int                         arch                /* I    Run-time architecture                                       */
+);
+
+/* Compute Normalized Line Spectral Frequencies (NLSFs) from whitening filter coefficients      */
+/* If not all roots are found, the a_Q16 coefficients are bandwidth expanded until convergence. */
+void silk_A2NLSF(
+    opus_int16                  *NLSF,              /* O    Normalized Line Spectral Frequencies in Q15 (0..2^15-1) [d] */
+    opus_int32                  *a_Q16,             /* I/O  Monic whitening filter coefficients in Q16 [d]              */
+    const opus_int              d                   /* I    Filter order (must be even)                                 */
+);
+
+/* compute whitening filter coefficients from normalized line spectral frequencies */
+void silk_NLSF2A(
+    opus_int16                  *a_Q12,             /* O    monic whitening filter coefficients in Q12,  [ d ]          */
+    const opus_int16            *NLSF,              /* I    normalized line spectral frequencies in Q15, [ d ]          */
+    const opus_int              d                   /* I    filter order (should be even)                               */
+);
+
+void silk_insertion_sort_increasing(
+    opus_int32                  *a,                 /* I/O   Unsorted / Sorted vector                                   */
+    opus_int                    *idx,               /* O     Index vector for the sorted elements                       */
+    const opus_int              L,                  /* I     Vector length                                              */
+    const opus_int              K                   /* I     Number of correctly sorted positions                       */
+);
+
+void silk_insertion_sort_decreasing_int16(
+    opus_int16                  *a,                 /* I/O   Unsorted / Sorted vector                                   */
+    opus_int                    *idx,               /* O     Index vector for the sorted elements                       */
+    const opus_int              L,                  /* I     Vector length                                              */
+    const opus_int              K                   /* I     Number of correctly sorted positions                       */
+);
+
+void silk_insertion_sort_increasing_all_values_int16(
+     opus_int16                 *a,                 /* I/O   Unsorted / Sorted vector                                   */
+     const opus_int             L                   /* I     Vector length                                              */
+);
+
+/* NLSF stabilizer, for a single input data vector */
+void silk_NLSF_stabilize(
+          opus_int16            *NLSF_Q15,          /* I/O   Unstable/stabilized normalized LSF vector in Q15 [L]       */
+    const opus_int16            *NDeltaMin_Q15,     /* I     Min distance vector, NDeltaMin_Q15[L] must be >= 1 [L+1]   */
+    const opus_int              L                   /* I     Number of NLSF parameters in the input vector              */
+);
+
+/* Laroia low complexity NLSF weights */
+void silk_NLSF_VQ_weights_laroia(
+    opus_int16                  *pNLSFW_Q_OUT,      /* O     Pointer to input vector weights [D]                        */
+    const opus_int16            *pNLSF_Q15,         /* I     Pointer to input vector         [D]                        */
+    const opus_int              D                   /* I     Input vector dimension (even)                              */
+);
+
+/* Compute reflection coefficients from input signal */
+void silk_burg_modified(
+    opus_int32                  *res_nrg,           /* O    Residual energy                                             */
+    opus_int                    *res_nrg_Q,         /* O    Residual energy Q value                                     */
+    opus_int32                  A_Q16[],            /* O    Prediction coefficients (length order)                      */
+    const opus_int16            x[],                /* I    Input signal, length: nb_subfr * ( D + subfr_length )       */
+    const opus_int32            minInvGain_Q30,     /* I    Inverse of max prediction gain                              */
+    const opus_int              subfr_length,       /* I    Input signal subframe length (incl. D preceding samples)    */
+    const opus_int              nb_subfr,           /* I    Number of subframes stacked in x                            */
+    const opus_int              D,                  /* I    Order                                                       */
+    int                         arch                /* I    Run-time architecture                                       */
+);
+
+/* Copy and multiply a vector by a constant */
+void silk_scale_copy_vector16(
+    opus_int16                  *data_out,
+    const opus_int16            *data_in,
+    opus_int32                  gain_Q16,           /* I    Gain in Q16                                                 */
+    const opus_int              dataSize            /* I    Length                                                      */
+);
+
+/* Some for the LTP related function requires Q26 to work.*/
+void silk_scale_vector32_Q26_lshift_18(
+    opus_int32                  *data1,             /* I/O  Q0/Q18                                                      */
+    opus_int32                  gain_Q26,           /* I    Q26                                                         */
+    opus_int                    dataSize            /* I    length                                                      */
+);
+
+/********************************************************************/
+/*                        INLINE ARM MATH                           */
+/********************************************************************/
+
+/*    return sum( inVec1[i] * inVec2[i] ) */
+opus_int32 silk_inner_prod_aligned(
+    const opus_int16 *const     inVec1,             /*    I input vector 1                                              */
+    const opus_int16 *const     inVec2,             /*    I input vector 2                                              */
+    const opus_int              len                 /*    I vector lengths                                              */
+);
+
+opus_int32 silk_inner_prod_aligned_scale(
+    const opus_int16 *const     inVec1,             /*    I input vector 1                                              */
+    const opus_int16 *const     inVec2,             /*    I input vector 2                                              */
+    const opus_int              scale,              /*    I number of bits to shift                                     */
+    const opus_int              len                 /*    I vector lengths                                              */
+);
+
+opus_int64 silk_inner_prod16_aligned_64(
+    const opus_int16            *inVec1,            /*    I input vector 1                                              */
+    const opus_int16            *inVec2,            /*    I input vector 2                                              */
+    const opus_int              len                 /*    I vector lengths                                              */
+);
+
+/********************************************************************/
+/*                                MACROS                            */
+/********************************************************************/
+
+/* Rotate a32 right by 'rot' bits. Negative rot values result in rotating
+   left. Output is 32bit int.
+   Note: contemporary compilers recognize the C expression below and
+   compile it into a 'ror' instruction if available. No need for OPUS_INLINE ASM! */
+static OPUS_INLINE opus_int32 silk_ROR32( opus_int32 a32, opus_int rot )
+{
+    opus_uint32 x = (opus_uint32) a32;
+    opus_uint32 r = (opus_uint32) rot;
+    opus_uint32 m = (opus_uint32) -rot;
+    if( rot == 0 ) {
+        return a32;
+    } else if( rot < 0 ) {
+        return (opus_int32) ((x << m) | (x >> (32 - m)));
+    } else {
+        return (opus_int32) ((x << (32 - r)) | (x >> r));
+    }
+}
+
+/* Allocate opus_int16 aligned to 4-byte memory address */
+#if EMBEDDED_ARM
+#define silk_DWORD_ALIGN __attribute__((aligned(4)))
+#else
+#define silk_DWORD_ALIGN
+#endif
+
+/* Useful Macros that can be adjusted to other platforms */
+#define silk_memcpy(dest, src, size)        memcpy((dest), (src), (size))
+#define silk_memset(dest, src, size)        memset((dest), (src), (size))
+#define silk_memmove(dest, src, size)       memmove((dest), (src), (size))
+
+/* Fixed point macros */
+
+/* (a32 * b32) output have to be 32bit int */
+#define silk_MUL(a32, b32)                  ((a32) * (b32))
+
+/* (a32 * b32) output have to be 32bit uint */
+#define silk_MUL_uint(a32, b32)             silk_MUL(a32, b32)
+
+/* a32 + (b32 * c32) output have to be 32bit int */
+#define silk_MLA(a32, b32, c32)             silk_ADD32((a32),((b32) * (c32)))
+
+/* a32 + (b32 * c32) output have to be 32bit uint */
+#define silk_MLA_uint(a32, b32, c32)        silk_MLA(a32, b32, c32)
+
+/* ((a32 >> 16)  * (b32 >> 16)) output have to be 32bit int */
+#define silk_SMULTT(a32, b32)               (((a32) >> 16) * ((b32) >> 16))
+
+/* a32 + ((a32 >> 16)  * (b32 >> 16)) output have to be 32bit int */
+#define silk_SMLATT(a32, b32, c32)          silk_ADD32((a32),((b32) >> 16) * ((c32) >> 16))
+
+#define silk_SMLALBB(a64, b16, c16)         silk_ADD64((a64),(opus_int64)((opus_int32)(b16) * (opus_int32)(c16)))
+
+/* (a32 * b32) */
+#define silk_SMULL(a32, b32)                ((opus_int64)(a32) * /*(opus_int64)*/(b32))
+
+/* Adds two signed 32-bit values in a way that can overflow, while not relying on undefined behaviour
+   (just standard two's complement implementation-specific behaviour) */
+#define silk_ADD32_ovflw(a, b)              ((opus_int32)((opus_uint32)(a) + (opus_uint32)(b)))
+/* Subtractss two signed 32-bit values in a way that can overflow, while not relying on undefined behaviour
+   (just standard two's complement implementation-specific behaviour) */
+#define silk_SUB32_ovflw(a, b)              ((opus_int32)((opus_uint32)(a) - (opus_uint32)(b)))
+
+/* Multiply-accumulate macros that allow overflow in the addition (ie, no asserts in debug mode) */
+#define silk_MLA_ovflw(a32, b32, c32)       silk_ADD32_ovflw((a32), (opus_uint32)(b32) * (opus_uint32)(c32))
+#define silk_SMLABB_ovflw(a32, b32, c32)    (silk_ADD32_ovflw((a32) , ((opus_int32)((opus_int16)(b32))) * (opus_int32)((opus_int16)(c32))))
+
+#define silk_DIV32_16(a32, b16)             ((opus_int32)((a32) / (b16)))
+#define silk_DIV32(a32, b32)                ((opus_int32)((a32) / (b32)))
+
+/* These macros enables checking for overflow in silk_API_Debug.h*/
+#define silk_ADD16(a, b)                    ((a) + (b))
+#define silk_ADD32(a, b)                    ((a) + (b))
+#define silk_ADD64(a, b)                    ((a) + (b))
+
+#define silk_SUB16(a, b)                    ((a) - (b))
+#define silk_SUB32(a, b)                    ((a) - (b))
+#define silk_SUB64(a, b)                    ((a) - (b))
+
+#define silk_SAT8(a)                        ((a) > silk_int8_MAX ? silk_int8_MAX  :       \
+                                            ((a) < silk_int8_MIN ? silk_int8_MIN  : (a)))
+#define silk_SAT16(a)                       ((a) > silk_int16_MAX ? silk_int16_MAX :      \
+                                            ((a) < silk_int16_MIN ? silk_int16_MIN : (a)))
+#define silk_SAT32(a)                       ((a) > silk_int32_MAX ? silk_int32_MAX :      \
+                                            ((a) < silk_int32_MIN ? silk_int32_MIN : (a)))
+
+#define silk_CHECK_FIT8(a)                  (a)
+#define silk_CHECK_FIT16(a)                 (a)
+#define silk_CHECK_FIT32(a)                 (a)
+
+#define silk_ADD_SAT16(a, b)                (opus_int16)silk_SAT16( silk_ADD32( (opus_int32)(a), (b) ) )
+#define silk_ADD_SAT64(a, b)                ((((a) + (b)) & 0x8000000000000000LL) == 0 ?                            \
+                                            ((((a) & (b)) & 0x8000000000000000LL) != 0 ? silk_int64_MIN : (a)+(b)) : \
+                                            ((((a) | (b)) & 0x8000000000000000LL) == 0 ? silk_int64_MAX : (a)+(b)) )
+
+#define silk_SUB_SAT16(a, b)                (opus_int16)silk_SAT16( silk_SUB32( (opus_int32)(a), (b) ) )
+#define silk_SUB_SAT64(a, b)                ((((a)-(b)) & 0x8000000000000000LL) == 0 ?                                               \
+                                            (( (a) & ((b)^0x8000000000000000LL) & 0x8000000000000000LL) ? silk_int64_MIN : (a)-(b)) : \
+                                            ((((a)^0x8000000000000000LL) & (b)  & 0x8000000000000000LL) ? silk_int64_MAX : (a)-(b)) )
+
+/* Saturation for positive input values */
+#define silk_POS_SAT32(a)                   ((a) > silk_int32_MAX ? silk_int32_MAX : (a))
+
+/* Add with saturation for positive input values */
+#define silk_ADD_POS_SAT8(a, b)             ((((a)+(b)) & 0x80)                 ? silk_int8_MAX  : ((a)+(b)))
+#define silk_ADD_POS_SAT16(a, b)            ((((a)+(b)) & 0x8000)               ? silk_int16_MAX : ((a)+(b)))
+#define silk_ADD_POS_SAT32(a, b)            ((((a)+(b)) & 0x80000000)           ? silk_int32_MAX : ((a)+(b)))
+#define silk_ADD_POS_SAT64(a, b)            ((((a)+(b)) & 0x8000000000000000LL) ? silk_int64_MAX : ((a)+(b)))
+
+#define silk_LSHIFT8(a, shift)              ((opus_int8)((opus_uint8)(a)<<(shift)))         /* shift >= 0, shift < 8  */
+#define silk_LSHIFT16(a, shift)             ((opus_int16)((opus_uint16)(a)<<(shift)))       /* shift >= 0, shift < 16 */
+#define silk_LSHIFT32(a, shift)             ((opus_int32)((opus_uint32)(a)<<(shift)))       /* shift >= 0, shift < 32 */
+#define silk_LSHIFT64(a, shift)             ((opus_int64)((opus_uint64)(a)<<(shift)))       /* shift >= 0, shift < 64 */
+#define silk_LSHIFT(a, shift)               silk_LSHIFT32(a, shift)                         /* shift >= 0, shift < 32 */
+
+#define silk_RSHIFT8(a, shift)              ((a)>>(shift))                                  /* shift >= 0, shift < 8  */
+#define silk_RSHIFT16(a, shift)             ((a)>>(shift))                                  /* shift >= 0, shift < 16 */
+#define silk_RSHIFT32(a, shift)             ((a)>>(shift))                                  /* shift >= 0, shift < 32 */
+#define silk_RSHIFT64(a, shift)             ((a)>>(shift))                                  /* shift >= 0, shift < 64 */
+#define silk_RSHIFT(a, shift)               silk_RSHIFT32(a, shift)                         /* shift >= 0, shift < 32 */
+
+/* saturates before shifting */
+#define silk_LSHIFT_SAT32(a, shift)         (silk_LSHIFT32( silk_LIMIT( (a), silk_RSHIFT32( silk_int32_MIN, (shift) ), \
+                                                    silk_RSHIFT32( silk_int32_MAX, (shift) ) ), (shift) ))
+
+#define silk_LSHIFT_ovflw(a, shift)         ((opus_int32)((opus_uint32)(a) << (shift)))     /* shift >= 0, allowed to overflow */
+#define silk_LSHIFT_uint(a, shift)          ((a) << (shift))                                /* shift >= 0 */
+#define silk_RSHIFT_uint(a, shift)          ((a) >> (shift))                                /* shift >= 0 */
+
+#define silk_ADD_LSHIFT(a, b, shift)        ((a) + silk_LSHIFT((b), (shift)))               /* shift >= 0 */
+#define silk_ADD_LSHIFT32(a, b, shift)      silk_ADD32((a), silk_LSHIFT32((b), (shift)))    /* shift >= 0 */
+#define silk_ADD_LSHIFT_uint(a, b, shift)   ((a) + silk_LSHIFT_uint((b), (shift)))          /* shift >= 0 */
+#define silk_ADD_RSHIFT(a, b, shift)        ((a) + silk_RSHIFT((b), (shift)))               /* shift >= 0 */
+#define silk_ADD_RSHIFT32(a, b, shift)      silk_ADD32((a), silk_RSHIFT32((b), (shift)))    /* shift >= 0 */
+#define silk_ADD_RSHIFT_uint(a, b, shift)   ((a) + silk_RSHIFT_uint((b), (shift)))          /* shift >= 0 */
+#define silk_SUB_LSHIFT32(a, b, shift)      silk_SUB32((a), silk_LSHIFT32((b), (shift)))    /* shift >= 0 */
+#define silk_SUB_RSHIFT32(a, b, shift)      silk_SUB32((a), silk_RSHIFT32((b), (shift)))    /* shift >= 0 */
+
+/* Requires that shift > 0 */
+#define silk_RSHIFT_ROUND(a, shift)         ((shift) == 1 ? ((a) >> 1) + ((a) & 1) : (((a) >> ((shift) - 1)) + 1) >> 1)
+#define silk_RSHIFT_ROUND64(a, shift)       ((shift) == 1 ? ((a) >> 1) + ((a) & 1) : (((a) >> ((shift) - 1)) + 1) >> 1)
+
+/* Number of rightshift required to fit the multiplication */
+#define silk_NSHIFT_MUL_32_32(a, b)         ( -(31- (32-silk_CLZ32(silk_abs(a)) + (32-silk_CLZ32(silk_abs(b))))) )
+#define silk_NSHIFT_MUL_16_16(a, b)         ( -(15- (16-silk_CLZ16(silk_abs(a)) + (16-silk_CLZ16(silk_abs(b))))) )
+
+
+#define silk_min(a, b)                      (((a) < (b)) ? (a) : (b))
+#define silk_max(a, b)                      (((a) > (b)) ? (a) : (b))
+
+/* Macro to convert floating-point constants to fixed-point */
+#define SILK_FIX_CONST( C, Q )              ((opus_int32)((C) * ((opus_int64)1 << (Q)) + 0.5))
+
+/* silk_min() versions with typecast in the function call */
+static OPUS_INLINE opus_int silk_min_int(opus_int a, opus_int b)
+{
+    return (((a) < (b)) ? (a) : (b));
+}
+static OPUS_INLINE opus_int16 silk_min_16(opus_int16 a, opus_int16 b)
+{
+    return (((a) < (b)) ? (a) : (b));
+}
+static OPUS_INLINE opus_int32 silk_min_32(opus_int32 a, opus_int32 b)
+{
+    return (((a) < (b)) ? (a) : (b));
+}
+static OPUS_INLINE opus_int64 silk_min_64(opus_int64 a, opus_int64 b)
+{
+    return (((a) < (b)) ? (a) : (b));
+}
+
+/* silk_min() versions with typecast in the function call */
+static OPUS_INLINE opus_int silk_max_int(opus_int a, opus_int b)
+{
+    return (((a) > (b)) ? (a) : (b));
+}
+static OPUS_INLINE opus_int16 silk_max_16(opus_int16 a, opus_int16 b)
+{
+    return (((a) > (b)) ? (a) : (b));
+}
+static OPUS_INLINE opus_int32 silk_max_32(opus_int32 a, opus_int32 b)
+{
+    return (((a) > (b)) ? (a) : (b));
+}
+static OPUS_INLINE opus_int64 silk_max_64(opus_int64 a, opus_int64 b)
+{
+    return (((a) > (b)) ? (a) : (b));
+}
+
+#define silk_LIMIT( a, limit1, limit2)      ((limit1) > (limit2) ? ((a) > (limit1) ? (limit1) : ((a) < (limit2) ? (limit2) : (a))) \
+                                                                 : ((a) > (limit2) ? (limit2) : ((a) < (limit1) ? (limit1) : (a))))
+
+#define silk_LIMIT_int                      silk_LIMIT
+#define silk_LIMIT_16                       silk_LIMIT
+#define silk_LIMIT_32                       silk_LIMIT
+
+#define silk_abs(a)                         (((a) >  0)  ? (a) : -(a))            /* Be careful, silk_abs returns wrong when input equals to silk_intXX_MIN */
+#define silk_abs_int(a)                     (((a) ^ ((a) >> (8 * sizeof(a) - 1))) - ((a) >> (8 * sizeof(a) - 1)))
+#define silk_abs_int32(a)                   (((a) ^ ((a) >> 31)) - ((a) >> 31))
+#define silk_abs_int64(a)                   (((a) >  0)  ? (a) : -(a))
+
+#define silk_sign(a)                        ((a) > 0 ? 1 : ( (a) < 0 ? -1 : 0 ))
+
+/* PSEUDO-RANDOM GENERATOR                                                          */
+/* Make sure to store the result as the seed for the next call (also in between     */
+/* frames), otherwise result won't be random at all. When only using some of the    */
+/* bits, take the most significant bits by right-shifting.                          */
+#define silk_RAND(seed)                     (silk_MLA_ovflw(907633515, (seed), 196314165))
+
+/*  Add some multiplication functions that can be easily mapped to ARM. */
+
+/*    silk_SMMUL: Signed top word multiply.
+          ARMv6        2 instruction cycles.
+          ARMv3M+      3 instruction cycles. use SMULL and ignore LSB registers.(except xM)*/
+/*#define silk_SMMUL(a32, b32)                (opus_int32)silk_RSHIFT(silk_SMLAL(silk_SMULWB((a32), (b32)), (a32), silk_RSHIFT_ROUND((b32), 16)), 16)*/
+/* the following seems faster on x86 */
+#define silk_SMMUL(a32, b32)                (opus_int32)silk_RSHIFT64(silk_SMULL((a32), (b32)), 32)
+
+#include "Inlines.h"
+#include "MacroCount.h"
+#include "MacroDebug.h"
+
+#ifdef OPUS_ARM_INLINE_ASM
+#include "arm/SigProc_FIX_armv4.h"
+#endif
+
+#ifdef OPUS_ARM_INLINE_EDSP
+#include "arm/SigProc_FIX_armv5e.h"
+#endif
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* SILK_SIGPROC_FIX_H */
diff --git a/drivers/opus/silk/VAD.c b/drivers/opus/silk/VAD.c
new file mode 100644
index 0000000000..3a5c566627
--- /dev/null
+++ b/drivers/opus/silk/VAD.c
@@ -0,0 +1,357 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+/* Silk VAD noise level estimation */
+static OPUS_INLINE void silk_VAD_GetNoiseLevels(
+    const opus_int32             pX[ VAD_N_BANDS ], /* I    subband energies                            */
+    silk_VAD_state              *psSilk_VAD         /* I/O  Pointer to Silk VAD state                   */
+);
+
+/**********************************/
+/* Initialization of the Silk VAD */
+/**********************************/
+opus_int silk_VAD_Init(                                         /* O    Return value, 0 if success                  */
+    silk_VAD_state              *psSilk_VAD                     /* I/O  Pointer to Silk VAD state                   */
+)
+{
+    opus_int b, ret = 0;
+
+    /* reset state memory */
+    silk_memset( psSilk_VAD, 0, sizeof( silk_VAD_state ) );
+
+    /* init noise levels */
+    /* Initialize array with approx pink noise levels (psd proportional to inverse of frequency) */
+    for( b = 0; b < VAD_N_BANDS; b++ ) {
+        psSilk_VAD->NoiseLevelBias[ b ] = silk_max_32( silk_DIV32_16( VAD_NOISE_LEVELS_BIAS, b + 1 ), 1 );
+    }
+
+    /* Initialize state */
+    for( b = 0; b < VAD_N_BANDS; b++ ) {
+        psSilk_VAD->NL[ b ]     = silk_MUL( 100, psSilk_VAD->NoiseLevelBias[ b ] );
+        psSilk_VAD->inv_NL[ b ] = silk_DIV32( silk_int32_MAX, psSilk_VAD->NL[ b ] );
+    }
+    psSilk_VAD->counter = 15;
+
+    /* init smoothed energy-to-noise ratio*/
+    for( b = 0; b < VAD_N_BANDS; b++ ) {
+        psSilk_VAD->NrgRatioSmth_Q8[ b ] = 100 * 256;       /* 100 * 256 --> 20 dB SNR */
+    }
+
+    return( ret );
+}
+
+/* Weighting factors for tilt measure */
+static const opus_int32 tiltWeights[ VAD_N_BANDS ] = { 30000, 6000, -12000, -12000 };
+
+/***************************************/
+/* Get the speech activity level in Q8 */
+/***************************************/
+opus_int silk_VAD_GetSA_Q8(                                     /* O    Return value, 0 if success                  */
+    silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
+    const opus_int16            pIn[]                           /* I    PCM input                                   */
+)
+{
+    opus_int   SA_Q15, pSNR_dB_Q7, input_tilt;
+    opus_int   decimated_framelength1, decimated_framelength2;
+    opus_int   decimated_framelength;
+    opus_int   dec_subframe_length, dec_subframe_offset, SNR_Q7, i, b, s;
+    opus_int32 sumSquared, smooth_coef_Q16;
+    opus_int16 HPstateTmp;
+    VARDECL( opus_int16, X );
+    opus_int32 Xnrg[ VAD_N_BANDS ];
+    opus_int32 NrgToNoiseRatio_Q8[ VAD_N_BANDS ];
+    opus_int32 speech_nrg, x_tmp;
+    opus_int   X_offset[ VAD_N_BANDS ];
+    opus_int   ret = 0;
+    silk_VAD_state *psSilk_VAD = &psEncC->sVAD;
+    SAVE_STACK;
+
+    /* Safety checks */
+    silk_assert( VAD_N_BANDS == 4 );
+    silk_assert( MAX_FRAME_LENGTH >= psEncC->frame_length );
+    silk_assert( psEncC->frame_length <= 512 );
+    silk_assert( psEncC->frame_length == 8 * silk_RSHIFT( psEncC->frame_length, 3 ) );
+
+    /***********************/
+    /* Filter and Decimate */
+    /***********************/
+    decimated_framelength1 = silk_RSHIFT( psEncC->frame_length, 1 );
+    decimated_framelength2 = silk_RSHIFT( psEncC->frame_length, 2 );
+    decimated_framelength = silk_RSHIFT( psEncC->frame_length, 3 );
+    /* Decimate into 4 bands:
+       0       L      3L       L              3L                             5L
+               -      --       -              --                             --
+               8       8       2               4                              4
+
+       [0-1 kHz| temp. |1-2 kHz|    2-4 kHz    |            4-8 kHz           |
+
+       They're arranged to allow the minimal ( frame_length / 4 ) extra
+       scratch space during the downsampling process */
+    X_offset[ 0 ] = 0;
+    X_offset[ 1 ] = decimated_framelength + decimated_framelength2;
+    X_offset[ 2 ] = X_offset[ 1 ] + decimated_framelength;
+    X_offset[ 3 ] = X_offset[ 2 ] + decimated_framelength2;
+    ALLOC( X, X_offset[ 3 ] + decimated_framelength1, opus_int16 );
+
+    /* 0-8 kHz to 0-4 kHz and 4-8 kHz */
+    silk_ana_filt_bank_1( pIn, &psSilk_VAD->AnaState[  0 ],
+        X, &X[ X_offset[ 3 ] ], psEncC->frame_length );
+
+    /* 0-4 kHz to 0-2 kHz and 2-4 kHz */
+    silk_ana_filt_bank_1( X, &psSilk_VAD->AnaState1[ 0 ],
+        X, &X[ X_offset[ 2 ] ], decimated_framelength1 );
+
+    /* 0-2 kHz to 0-1 kHz and 1-2 kHz */
+    silk_ana_filt_bank_1( X, &psSilk_VAD->AnaState2[ 0 ],
+        X, &X[ X_offset[ 1 ] ], decimated_framelength2 );
+
+    /*********************************************/
+    /* HP filter on lowest band (differentiator) */
+    /*********************************************/
+    X[ decimated_framelength - 1 ] = silk_RSHIFT( X[ decimated_framelength - 1 ], 1 );
+    HPstateTmp = X[ decimated_framelength - 1 ];
+    for( i = decimated_framelength - 1; i > 0; i-- ) {
+        X[ i - 1 ]  = silk_RSHIFT( X[ i - 1 ], 1 );
+        X[ i ]     -= X[ i - 1 ];
+    }
+    X[ 0 ] -= psSilk_VAD->HPstate;
+    psSilk_VAD->HPstate = HPstateTmp;
+
+    /*************************************/
+    /* Calculate the energy in each band */
+    /*************************************/
+    for( b = 0; b < VAD_N_BANDS; b++ ) {
+        /* Find the decimated framelength in the non-uniformly divided bands */
+        decimated_framelength = silk_RSHIFT( psEncC->frame_length, silk_min_int( VAD_N_BANDS - b, VAD_N_BANDS - 1 ) );
+
+        /* Split length into subframe lengths */
+        dec_subframe_length = silk_RSHIFT( decimated_framelength, VAD_INTERNAL_SUBFRAMES_LOG2 );
+        dec_subframe_offset = 0;
+
+        /* Compute energy per sub-frame */
+        /* initialize with summed energy of last subframe */
+        Xnrg[ b ] = psSilk_VAD->XnrgSubfr[ b ];
+        for( s = 0; s < VAD_INTERNAL_SUBFRAMES; s++ ) {
+            sumSquared = 0;
+            for( i = 0; i < dec_subframe_length; i++ ) {
+                /* The energy will be less than dec_subframe_length * ( silk_int16_MIN / 8 ) ^ 2.            */
+                /* Therefore we can accumulate with no risk of overflow (unless dec_subframe_length > 128)  */
+                x_tmp = silk_RSHIFT(
+                    X[ X_offset[ b ] + i + dec_subframe_offset ], 3 );
+                sumSquared = silk_SMLABB( sumSquared, x_tmp, x_tmp );
+
+                /* Safety check */
+                silk_assert( sumSquared >= 0 );
+            }
+
+            /* Add/saturate summed energy of current subframe */
+            if( s < VAD_INTERNAL_SUBFRAMES - 1 ) {
+                Xnrg[ b ] = silk_ADD_POS_SAT32( Xnrg[ b ], sumSquared );
+            } else {
+                /* Look-ahead subframe */
+                Xnrg[ b ] = silk_ADD_POS_SAT32( Xnrg[ b ], silk_RSHIFT( sumSquared, 1 ) );
+            }
+
+            dec_subframe_offset += dec_subframe_length;
+        }
+        psSilk_VAD->XnrgSubfr[ b ] = sumSquared;
+    }
+
+    /********************/
+    /* Noise estimation */
+    /********************/
+    silk_VAD_GetNoiseLevels( &Xnrg[ 0 ], psSilk_VAD );
+
+    /***********************************************/
+    /* Signal-plus-noise to noise ratio estimation */
+    /***********************************************/
+    sumSquared = 0;
+    input_tilt = 0;
+    for( b = 0; b < VAD_N_BANDS; b++ ) {
+        speech_nrg = Xnrg[ b ] - psSilk_VAD->NL[ b ];
+        if( speech_nrg > 0 ) {
+            /* Divide, with sufficient resolution */
+            if( ( Xnrg[ b ] & 0xFF800000 ) == 0 ) {
+                NrgToNoiseRatio_Q8[ b ] = silk_DIV32( silk_LSHIFT( Xnrg[ b ], 8 ), psSilk_VAD->NL[ b ] + 1 );
+            } else {
+                NrgToNoiseRatio_Q8[ b ] = silk_DIV32( Xnrg[ b ], silk_RSHIFT( psSilk_VAD->NL[ b ], 8 ) + 1 );
+            }
+
+            /* Convert to log domain */
+            SNR_Q7 = silk_lin2log( NrgToNoiseRatio_Q8[ b ] ) - 8 * 128;
+
+            /* Sum-of-squares */
+            sumSquared = silk_SMLABB( sumSquared, SNR_Q7, SNR_Q7 );          /* Q14 */
+
+            /* Tilt measure */
+            if( speech_nrg < ( (opus_int32)1 << 20 ) ) {
+                /* Scale down SNR value for small subband speech energies */
+                SNR_Q7 = silk_SMULWB( silk_LSHIFT( silk_SQRT_APPROX( speech_nrg ), 6 ), SNR_Q7 );
+            }
+            input_tilt = silk_SMLAWB( input_tilt, tiltWeights[ b ], SNR_Q7 );
+        } else {
+            NrgToNoiseRatio_Q8[ b ] = 256;
+        }
+    }
+
+    /* Mean-of-squares */
+    sumSquared = silk_DIV32_16( sumSquared, VAD_N_BANDS ); /* Q14 */
+
+    /* Root-mean-square approximation, scale to dBs, and write to output pointer */
+    pSNR_dB_Q7 = (opus_int16)( 3 * silk_SQRT_APPROX( sumSquared ) ); /* Q7 */
+
+    /*********************************/
+    /* Speech Probability Estimation */
+    /*********************************/
+    SA_Q15 = silk_sigm_Q15( silk_SMULWB( VAD_SNR_FACTOR_Q16, pSNR_dB_Q7 ) - VAD_NEGATIVE_OFFSET_Q5 );
+
+    /**************************/
+    /* Frequency Tilt Measure */
+    /**************************/
+    psEncC->input_tilt_Q15 = silk_LSHIFT( silk_sigm_Q15( input_tilt ) - 16384, 1 );
+
+    /**************************************************/
+    /* Scale the sigmoid output based on power levels */
+    /**************************************************/
+    speech_nrg = 0;
+    for( b = 0; b < VAD_N_BANDS; b++ ) {
+        /* Accumulate signal-without-noise energies, higher frequency bands have more weight */
+        speech_nrg += ( b + 1 ) * silk_RSHIFT( Xnrg[ b ] - psSilk_VAD->NL[ b ], 4 );
+    }
+
+    /* Power scaling */
+    if( speech_nrg <= 0 ) {
+        SA_Q15 = silk_RSHIFT( SA_Q15, 1 );
+    } else if( speech_nrg < 32768 ) {
+        if( psEncC->frame_length == 10 * psEncC->fs_kHz ) {
+            speech_nrg = silk_LSHIFT_SAT32( speech_nrg, 16 );
+        } else {
+            speech_nrg = silk_LSHIFT_SAT32( speech_nrg, 15 );
+        }
+
+        /* square-root */
+        speech_nrg = silk_SQRT_APPROX( speech_nrg );
+        SA_Q15 = silk_SMULWB( 32768 + speech_nrg, SA_Q15 );
+    }
+
+    /* Copy the resulting speech activity in Q8 */
+    psEncC->speech_activity_Q8 = silk_min_int( silk_RSHIFT( SA_Q15, 7 ), silk_uint8_MAX );
+
+    /***********************************/
+    /* Energy Level and SNR estimation */
+    /***********************************/
+    /* Smoothing coefficient */
+    smooth_coef_Q16 = silk_SMULWB( VAD_SNR_SMOOTH_COEF_Q18, silk_SMULWB( (opus_int32)SA_Q15, SA_Q15 ) );
+
+    if( psEncC->frame_length == 10 * psEncC->fs_kHz ) {
+        smooth_coef_Q16 >>= 1;
+    }
+
+    for( b = 0; b < VAD_N_BANDS; b++ ) {
+        /* compute smoothed energy-to-noise ratio per band */
+        psSilk_VAD->NrgRatioSmth_Q8[ b ] = silk_SMLAWB( psSilk_VAD->NrgRatioSmth_Q8[ b ],
+            NrgToNoiseRatio_Q8[ b ] - psSilk_VAD->NrgRatioSmth_Q8[ b ], smooth_coef_Q16 );
+
+        /* signal to noise ratio in dB per band */
+        SNR_Q7 = 3 * ( silk_lin2log( psSilk_VAD->NrgRatioSmth_Q8[b] ) - 8 * 128 );
+        /* quality = sigmoid( 0.25 * ( SNR_dB - 16 ) ); */
+        psEncC->input_quality_bands_Q15[ b ] = silk_sigm_Q15( silk_RSHIFT( SNR_Q7 - 16 * 128, 4 ) );
+    }
+
+    RESTORE_STACK;
+    return( ret );
+}
+
+/**************************/
+/* Noise level estimation */
+/**************************/
+static OPUS_INLINE void silk_VAD_GetNoiseLevels(
+    const opus_int32            pX[ VAD_N_BANDS ],  /* I    subband energies                            */
+    silk_VAD_state              *psSilk_VAD         /* I/O  Pointer to Silk VAD state                   */
+)
+{
+    opus_int   k;
+    opus_int32 nl, nrg, inv_nrg;
+    opus_int   coef, min_coef;
+
+    /* Initially faster smoothing */
+    if( psSilk_VAD->counter < 1000 ) { /* 1000 = 20 sec */
+        min_coef = silk_DIV32_16( silk_int16_MAX, silk_RSHIFT( psSilk_VAD->counter, 4 ) + 1 );
+    } else {
+        min_coef = 0;
+    }
+
+    for( k = 0; k < VAD_N_BANDS; k++ ) {
+        /* Get old noise level estimate for current band */
+        nl = psSilk_VAD->NL[ k ];
+        silk_assert( nl >= 0 );
+
+        /* Add bias */
+        nrg = silk_ADD_POS_SAT32( pX[ k ], psSilk_VAD->NoiseLevelBias[ k ] );
+        silk_assert( nrg > 0 );
+
+        /* Invert energies */
+        inv_nrg = silk_DIV32( silk_int32_MAX, nrg );
+        silk_assert( inv_nrg >= 0 );
+
+        /* Less update when subband energy is high */
+        if( nrg > silk_LSHIFT( nl, 3 ) ) {
+            coef = VAD_NOISE_LEVEL_SMOOTH_COEF_Q16 >> 3;
+        } else if( nrg < nl ) {
+            coef = VAD_NOISE_LEVEL_SMOOTH_COEF_Q16;
+        } else {
+            coef = silk_SMULWB( silk_SMULWW( inv_nrg, nl ), VAD_NOISE_LEVEL_SMOOTH_COEF_Q16 << 1 );
+        }
+
+        /* Initially faster smoothing */
+        coef = silk_max_int( coef, min_coef );
+
+        /* Smooth inverse energies */
+        psSilk_VAD->inv_NL[ k ] = silk_SMLAWB( psSilk_VAD->inv_NL[ k ], inv_nrg - psSilk_VAD->inv_NL[ k ], coef );
+        silk_assert( psSilk_VAD->inv_NL[ k ] >= 0 );
+
+        /* Compute noise level by inverting again */
+        nl = silk_DIV32( silk_int32_MAX, psSilk_VAD->inv_NL[ k ] );
+        silk_assert( nl >= 0 );
+
+        /* Limit noise levels (guarantee 7 bits of head room) */
+        nl = silk_min( nl, 0x00FFFFFF );
+
+        /* Store as part of state */
+        psSilk_VAD->NL[ k ] = nl;
+    }
+
+    /* Increment frame counter */
+    psSilk_VAD->counter++;
+}
diff --git a/drivers/opus/silk/VQ_WMat_EC.c b/drivers/opus/silk/VQ_WMat_EC.c
new file mode 100644
index 0000000000..28c5fc7e6f
--- /dev/null
+++ b/drivers/opus/silk/VQ_WMat_EC.c
@@ -0,0 +1,120 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Entropy constrained matrix-weighted VQ, hard-coded to 5-element vectors, for a single input data vector */
+void silk_VQ_WMat_EC(
+    opus_int8                   *ind,                           /* O    index of best codebook vector               */
+    opus_int32                  *rate_dist_Q14,                 /* O    best weighted quant error + mu * rate       */
+    opus_int                    *gain_Q7,                       /* O    sum of absolute LTP coefficients            */
+    const opus_int16            *in_Q14,                        /* I    input vector to be quantized                */
+    const opus_int32            *W_Q18,                         /* I    weighting matrix                            */
+    const opus_int8             *cb_Q7,                         /* I    codebook                                    */
+    const opus_uint8            *cb_gain_Q7,                    /* I    codebook effective gain                     */
+    const opus_uint8            *cl_Q5,                         /* I    code length for each codebook vector        */
+    const opus_int              mu_Q9,                          /* I    tradeoff betw. weighted error and rate      */
+    const opus_int32            max_gain_Q7,                    /* I    maximum sum of absolute LTP coefficients    */
+    opus_int                    L                               /* I    number of vectors in codebook               */
+)
+{
+    opus_int   k, gain_tmp_Q7;
+    const opus_int8 *cb_row_Q7;
+    opus_int16 diff_Q14[ 5 ];
+    opus_int32 sum1_Q14, sum2_Q16;
+
+    /* Loop over codebook */
+    *rate_dist_Q14 = silk_int32_MAX;
+    cb_row_Q7 = cb_Q7;
+    for( k = 0; k < L; k++ ) {
+	    gain_tmp_Q7 = cb_gain_Q7[k];
+
+        diff_Q14[ 0 ] = in_Q14[ 0 ] - silk_LSHIFT( cb_row_Q7[ 0 ], 7 );
+        diff_Q14[ 1 ] = in_Q14[ 1 ] - silk_LSHIFT( cb_row_Q7[ 1 ], 7 );
+        diff_Q14[ 2 ] = in_Q14[ 2 ] - silk_LSHIFT( cb_row_Q7[ 2 ], 7 );
+        diff_Q14[ 3 ] = in_Q14[ 3 ] - silk_LSHIFT( cb_row_Q7[ 3 ], 7 );
+        diff_Q14[ 4 ] = in_Q14[ 4 ] - silk_LSHIFT( cb_row_Q7[ 4 ], 7 );
+
+        /* Weighted rate */
+        sum1_Q14 = silk_SMULBB( mu_Q9, cl_Q5[ k ] );
+
+		/* Penalty for too large gain */
+		sum1_Q14 = silk_ADD_LSHIFT32( sum1_Q14, silk_max( silk_SUB32( gain_tmp_Q7, max_gain_Q7 ), 0 ), 10 );
+
+        silk_assert( sum1_Q14 >= 0 );
+
+        /* first row of W_Q18 */
+        sum2_Q16 = silk_SMULWB(           W_Q18[  1 ], diff_Q14[ 1 ] );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[  2 ], diff_Q14[ 2 ] );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[  3 ], diff_Q14[ 3 ] );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[  4 ], diff_Q14[ 4 ] );
+        sum2_Q16 = silk_LSHIFT( sum2_Q16, 1 );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[  0 ], diff_Q14[ 0 ] );
+        sum1_Q14 = silk_SMLAWB( sum1_Q14, sum2_Q16,    diff_Q14[ 0 ] );
+
+        /* second row of W_Q18 */
+        sum2_Q16 = silk_SMULWB(           W_Q18[  7 ], diff_Q14[ 2 ] );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[  8 ], diff_Q14[ 3 ] );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[  9 ], diff_Q14[ 4 ] );
+        sum2_Q16 = silk_LSHIFT( sum2_Q16, 1 );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[  6 ], diff_Q14[ 1 ] );
+        sum1_Q14 = silk_SMLAWB( sum1_Q14, sum2_Q16,    diff_Q14[ 1 ] );
+
+        /* third row of W_Q18 */
+        sum2_Q16 = silk_SMULWB(           W_Q18[ 13 ], diff_Q14[ 3 ] );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[ 14 ], diff_Q14[ 4 ] );
+        sum2_Q16 = silk_LSHIFT( sum2_Q16, 1 );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[ 12 ], diff_Q14[ 2 ] );
+        sum1_Q14 = silk_SMLAWB( sum1_Q14, sum2_Q16,    diff_Q14[ 2 ] );
+
+        /* fourth row of W_Q18 */
+        sum2_Q16 = silk_SMULWB(           W_Q18[ 19 ], diff_Q14[ 4 ] );
+        sum2_Q16 = silk_LSHIFT( sum2_Q16, 1 );
+        sum2_Q16 = silk_SMLAWB( sum2_Q16, W_Q18[ 18 ], diff_Q14[ 3 ] );
+        sum1_Q14 = silk_SMLAWB( sum1_Q14, sum2_Q16,    diff_Q14[ 3 ] );
+
+        /* last row of W_Q18 */
+        sum2_Q16 = silk_SMULWB(           W_Q18[ 24 ], diff_Q14[ 4 ] );
+        sum1_Q14 = silk_SMLAWB( sum1_Q14, sum2_Q16,    diff_Q14[ 4 ] );
+
+        silk_assert( sum1_Q14 >= 0 );
+
+        /* find best */
+        if( sum1_Q14 < *rate_dist_Q14 ) {
+            *rate_dist_Q14 = sum1_Q14;
+            *ind = (opus_int8)k;
+			*gain_Q7 = gain_tmp_Q7;
+        }
+
+        /* Go to next cbk vector */
+        cb_row_Q7 += LTP_ORDER;
+    }
+}
diff --git a/drivers/opus/silk/ana_filt_bank_1.c b/drivers/opus/silk/ana_filt_bank_1.c
new file mode 100644
index 0000000000..387dcd87e7
--- /dev/null
+++ b/drivers/opus/silk/ana_filt_bank_1.c
@@ -0,0 +1,74 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Coefficients for 2-band filter bank based on first-order allpass filters */
+static opus_int16 A_fb1_20 = 5394 << 1;
+static opus_int16 A_fb1_21 = -24290; /* (opus_int16)(20623 << 1) */
+
+/* Split signal into two decimated bands using first-order allpass filters */
+void silk_ana_filt_bank_1(
+    const opus_int16            *in,                /* I    Input signal [N]                                            */
+    opus_int32                  *S,                 /* I/O  State vector [2]                                            */
+    opus_int16                  *outL,              /* O    Low band [N/2]                                              */
+    opus_int16                  *outH,              /* O    High band [N/2]                                             */
+    const opus_int32            N                   /* I    Number of input samples                                     */
+)
+{
+    opus_int      k, N2 = silk_RSHIFT( N, 1 );
+    opus_int32    in32, X, Y, out_1, out_2;
+
+    /* Internal variables and state are in Q10 format */
+    for( k = 0; k < N2; k++ ) {
+        /* Convert to Q10 */
+        in32 = silk_LSHIFT( (opus_int32)in[ 2 * k ], 10 );
+
+        /* All-pass section for even input sample */
+        Y      = silk_SUB32( in32, S[ 0 ] );
+        X      = silk_SMLAWB( Y, Y, A_fb1_21 );
+        out_1  = silk_ADD32( S[ 0 ], X );
+        S[ 0 ] = silk_ADD32( in32, X );
+
+        /* Convert to Q10 */
+        in32 = silk_LSHIFT( (opus_int32)in[ 2 * k + 1 ], 10 );
+
+        /* All-pass section for odd input sample, and add to output of previous section */
+        Y      = silk_SUB32( in32, S[ 1 ] );
+        X      = silk_SMULWB( Y, A_fb1_20 );
+        out_2  = silk_ADD32( S[ 1 ], X );
+        S[ 1 ] = silk_ADD32( in32, X );
+
+        /* Add/subtract, convert back to int16 and store to output */
+        outL[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_ADD32( out_2, out_1 ), 11 ) );
+        outH[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SUB32( out_2, out_1 ), 11 ) );
+    }
+}
diff --git a/drivers/opus/silk/arm/SigProc_FIX_armv4.h b/drivers/opus/silk/arm/SigProc_FIX_armv4.h
new file mode 100644
index 0000000000..ff62b1e5d6
--- /dev/null
+++ b/drivers/opus/silk/arm/SigProc_FIX_armv4.h
@@ -0,0 +1,47 @@
+/***********************************************************************
+Copyright (C) 2013 Xiph.Org Foundation and contributors
+Copyright (c) 2013       Parrot
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_SIGPROC_FIX_ARMv4_H
+#define SILK_SIGPROC_FIX_ARMv4_H
+
+#undef silk_MLA
+static OPUS_INLINE opus_int32 silk_MLA_armv4(opus_int32 a, opus_int32 b,
+ opus_int32 c)
+{
+  opus_int32 res;
+  __asm__(
+      "#silk_MLA\n\t"
+      "mla %0, %1, %2, %3\n\t"
+      : "=&r"(res)
+      : "r"(b), "r"(c), "r"(a)
+  );
+  return res;
+}
+#define silk_MLA(a, b, c) (silk_MLA_armv4(a, b, c))
+
+#endif
diff --git a/drivers/opus/silk/arm/SigProc_FIX_armv5e.h b/drivers/opus/silk/arm/SigProc_FIX_armv5e.h
new file mode 100644
index 0000000000..617a09cab1
--- /dev/null
+++ b/drivers/opus/silk/arm/SigProc_FIX_armv5e.h
@@ -0,0 +1,61 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Copyright (c) 2013       Parrot
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_SIGPROC_FIX_ARMv5E_H
+#define SILK_SIGPROC_FIX_ARMv5E_H
+
+#undef silk_SMULTT
+static OPUS_INLINE opus_int32 silk_SMULTT_armv5e(opus_int32 a, opus_int32 b)
+{
+  opus_int32 res;
+  __asm__(
+      "#silk_SMULTT\n\t"
+      "smultt %0, %1, %2\n\t"
+      : "=r"(res)
+      : "%r"(a), "r"(b)
+  );
+  return res;
+}
+#define silk_SMULTT(a, b) (silk_SMULTT_armv5e(a, b))
+
+#undef silk_SMLATT
+static OPUS_INLINE opus_int32 silk_SMLATT_armv5e(opus_int32 a, opus_int32 b,
+ opus_int32 c)
+{
+  opus_int32 res;
+  __asm__(
+      "#silk_SMLATT\n\t"
+      "smlatt %0, %1, %2, %3\n\t"
+      : "=r"(res)
+      : "%r"(b), "r"(c), "r"(a)
+  );
+  return res;
+}
+#define silk_SMLATT(a, b, c) (silk_SMLATT_armv5e(a, b, c))
+
+#endif
diff --git a/drivers/opus/silk/arm/macros_armv4.h b/drivers/opus/silk/arm/macros_armv4.h
new file mode 100644
index 0000000000..3f30e97288
--- /dev/null
+++ b/drivers/opus/silk/arm/macros_armv4.h
@@ -0,0 +1,103 @@
+/***********************************************************************
+Copyright (C) 2013 Xiph.Org Foundation and contributors.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MACROS_ARMv4_H
+#define SILK_MACROS_ARMv4_H
+
+/* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
+#undef silk_SMULWB
+static OPUS_INLINE opus_int32 silk_SMULWB_armv4(opus_int32 a, opus_int16 b)
+{
+  unsigned rd_lo;
+  int rd_hi;
+  __asm__(
+      "#silk_SMULWB\n\t"
+      "smull %0, %1, %2, %3\n\t"
+      : "=&r"(rd_lo), "=&r"(rd_hi)
+      : "%r"(a), "r"(b<<16)
+  );
+  return rd_hi;
+}
+#define silk_SMULWB(a, b) (silk_SMULWB_armv4(a, b))
+
+/* a32 + (b32 * (opus_int32)((opus_int16)(c32))) >> 16 output have to be 32bit int */
+#undef silk_SMLAWB
+#define silk_SMLAWB(a, b, c) ((a) + silk_SMULWB(b, c))
+
+/* (a32 * (b32 >> 16)) >> 16 */
+#undef silk_SMULWT
+static OPUS_INLINE opus_int32 silk_SMULWT_armv4(opus_int32 a, opus_int32 b)
+{
+  unsigned rd_lo;
+  int rd_hi;
+  __asm__(
+      "#silk_SMULWT\n\t"
+      "smull %0, %1, %2, %3\n\t"
+      : "=&r"(rd_lo), "=&r"(rd_hi)
+      : "%r"(a), "r"(b&~0xFFFF)
+  );
+  return rd_hi;
+}
+#define silk_SMULWT(a, b) (silk_SMULWT_armv4(a, b))
+
+/* a32 + (b32 * (c32 >> 16)) >> 16 */
+#undef silk_SMLAWT
+#define silk_SMLAWT(a, b, c) ((a) + silk_SMULWT(b, c))
+
+/* (a32 * b32) >> 16 */
+#undef silk_SMULWW
+static OPUS_INLINE opus_int32 silk_SMULWW_armv4(opus_int32 a, opus_int32 b)
+{
+  unsigned rd_lo;
+  int rd_hi;
+  __asm__(
+    "#silk_SMULWW\n\t"
+    "smull %0, %1, %2, %3\n\t"
+    : "=&r"(rd_lo), "=&r"(rd_hi)
+    : "%r"(a), "r"(b)
+  );
+  return (rd_hi<<16)+(rd_lo>>16);
+}
+#define silk_SMULWW(a, b) (silk_SMULWW_armv4(a, b))
+
+#undef silk_SMLAWW
+static OPUS_INLINE opus_int32 silk_SMLAWW_armv4(opus_int32 a, opus_int32 b,
+ opus_int32 c)
+{
+  unsigned rd_lo;
+  int rd_hi;
+  __asm__(
+    "#silk_SMLAWW\n\t"
+    "smull %0, %1, %2, %3\n\t"
+    : "=&r"(rd_lo), "=&r"(rd_hi)
+    : "%r"(b), "r"(c)
+  );
+  return a+(rd_hi<<16)+(rd_lo>>16);
+}
+#define silk_SMLAWW(a, b, c) (silk_SMLAWW_armv4(a, b, c))
+
+#endif /* SILK_MACROS_ARMv4_H */
diff --git a/drivers/opus/silk/arm/macros_armv5e.h b/drivers/opus/silk/arm/macros_armv5e.h
new file mode 100644
index 0000000000..aad4117e46
--- /dev/null
+++ b/drivers/opus/silk/arm/macros_armv5e.h
@@ -0,0 +1,213 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Copyright (c) 2013       Parrot
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MACROS_ARMv5E_H
+#define SILK_MACROS_ARMv5E_H
+
+/* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
+#undef silk_SMULWB
+static OPUS_INLINE opus_int32 silk_SMULWB_armv5e(opus_int32 a, opus_int16 b)
+{
+  int res;
+  __asm__(
+      "#silk_SMULWB\n\t"
+      "smulwb %0, %1, %2\n\t"
+      : "=r"(res)
+      : "r"(a), "r"(b)
+  );
+  return res;
+}
+#define silk_SMULWB(a, b) (silk_SMULWB_armv5e(a, b))
+
+/* a32 + (b32 * (opus_int32)((opus_int16)(c32))) >> 16 output have to be 32bit int */
+#undef silk_SMLAWB
+static OPUS_INLINE opus_int32 silk_SMLAWB_armv5e(opus_int32 a, opus_int32 b,
+ opus_int16 c)
+{
+  int res;
+  __asm__(
+      "#silk_SMLAWB\n\t"
+      "smlawb %0, %1, %2, %3\n\t"
+      : "=r"(res)
+      : "r"(b), "r"(c), "r"(a)
+  );
+  return res;
+}
+#define silk_SMLAWB(a, b, c) (silk_SMLAWB_armv5e(a, b, c))
+
+/* (a32 * (b32 >> 16)) >> 16 */
+#undef silk_SMULWT
+static OPUS_INLINE opus_int32 silk_SMULWT_armv5e(opus_int32 a, opus_int32 b)
+{
+  int res;
+  __asm__(
+      "#silk_SMULWT\n\t"
+      "smulwt %0, %1, %2\n\t"
+      : "=r"(res)
+      : "r"(a), "r"(b)
+  );
+  return res;
+}
+#define silk_SMULWT(a, b) (silk_SMULWT_armv5e(a, b))
+
+/* a32 + (b32 * (c32 >> 16)) >> 16 */
+#undef silk_SMLAWT
+static OPUS_INLINE opus_int32 silk_SMLAWT_armv5e(opus_int32 a, opus_int32 b,
+ opus_int32 c)
+{
+  int res;
+  __asm__(
+      "#silk_SMLAWT\n\t"
+      "smlawt %0, %1, %2, %3\n\t"
+      : "=r"(res)
+      : "r"(b), "r"(c), "r"(a)
+  );
+  return res;
+}
+#define silk_SMLAWT(a, b, c) (silk_SMLAWT_armv5e(a, b, c))
+
+/* (opus_int32)((opus_int16)(a3))) * (opus_int32)((opus_int16)(b32)) output have to be 32bit int */
+#undef silk_SMULBB
+static OPUS_INLINE opus_int32 silk_SMULBB_armv5e(opus_int32 a, opus_int32 b)
+{
+  int res;
+  __asm__(
+      "#silk_SMULBB\n\t"
+      "smulbb %0, %1, %2\n\t"
+      : "=r"(res)
+      : "%r"(a), "r"(b)
+  );
+  return res;
+}
+#define silk_SMULBB(a, b) (silk_SMULBB_armv5e(a, b))
+
+/* a32 + (opus_int32)((opus_int16)(b32)) * (opus_int32)((opus_int16)(c32)) output have to be 32bit int */
+#undef silk_SMLABB
+static OPUS_INLINE opus_int32 silk_SMLABB_armv5e(opus_int32 a, opus_int32 b,
+ opus_int32 c)
+{
+  int res;
+  __asm__(
+      "#silk_SMLABB\n\t"
+      "smlabb %0, %1, %2, %3\n\t"
+      : "=r"(res)
+      : "%r"(b), "r"(c), "r"(a)
+  );
+  return res;
+}
+#define silk_SMLABB(a, b, c) (silk_SMLABB_armv5e(a, b, c))
+
+/* (opus_int32)((opus_int16)(a32)) * (b32 >> 16) */
+#undef silk_SMULBT
+static OPUS_INLINE opus_int32 silk_SMULBT_armv5e(opus_int32 a, opus_int32 b)
+{
+  int res;
+  __asm__(
+      "#silk_SMULBT\n\t"
+      "smulbt %0, %1, %2\n\t"
+      : "=r"(res)
+      : "r"(a), "r"(b)
+  );
+  return res;
+}
+#define silk_SMULBT(a, b) (silk_SMULBT_armv5e(a, b))
+
+/* a32 + (opus_int32)((opus_int16)(b32)) * (c32 >> 16) */
+#undef silk_SMLABT
+static OPUS_INLINE opus_int32 silk_SMLABT_armv5e(opus_int32 a, opus_int32 b,
+ opus_int32 c)
+{
+  int res;
+  __asm__(
+      "#silk_SMLABT\n\t"
+      "smlabt %0, %1, %2, %3\n\t"
+      : "=r"(res)
+      : "r"(b), "r"(c), "r"(a)
+  );
+  return res;
+}
+#define silk_SMLABT(a, b, c) (silk_SMLABT_armv5e(a, b, c))
+
+/* add/subtract with output saturated */
+#undef silk_ADD_SAT32
+static OPUS_INLINE opus_int32 silk_ADD_SAT32_armv5e(opus_int32 a, opus_int32 b)
+{
+  int res;
+  __asm__(
+      "#silk_ADD_SAT32\n\t"
+      "qadd %0, %1, %2\n\t"
+      : "=r"(res)
+      : "%r"(a), "r"(b)
+  );
+  return res;
+}
+#define silk_ADD_SAT32(a, b) (silk_ADD_SAT32_armv5e(a, b))
+
+#undef silk_SUB_SAT32
+static OPUS_INLINE opus_int32 silk_SUB_SAT32_armv5e(opus_int32 a, opus_int32 b)
+{
+  int res;
+  __asm__(
+      "#silk_SUB_SAT32\n\t"
+      "qsub %0, %1, %2\n\t"
+      : "=r"(res)
+      : "r"(a), "r"(b)
+  );
+  return res;
+}
+#define silk_SUB_SAT32(a, b) (silk_SUB_SAT32_armv5e(a, b))
+
+#undef silk_CLZ16
+static OPUS_INLINE opus_int32 silk_CLZ16_armv5(opus_int16 in16)
+{
+  int res;
+  __asm__(
+      "#silk_CLZ16\n\t"
+      "clz %0, %1;\n"
+      : "=r"(res)
+      : "r"(in16<<16|0x8000)
+  );
+  return res;
+}
+#define silk_CLZ16(in16) (silk_CLZ16_armv5(in16))
+
+#undef silk_CLZ32
+static OPUS_INLINE opus_int32 silk_CLZ32_armv5(opus_int32 in32)
+{
+  int res;
+  __asm__(
+      "#silk_CLZ32\n\t"
+      "clz %0, %1\n\t"
+      : "=r"(res)
+      : "r"(in32)
+  );
+  return res;
+}
+#define silk_CLZ32(in32) (silk_CLZ32_armv5(in32))
+
+#endif /* SILK_MACROS_ARMv5E_H */
diff --git a/drivers/opus/silk/biquad_alt.c b/drivers/opus/silk/biquad_alt.c
new file mode 100644
index 0000000000..5f1d6d25c3
--- /dev/null
+++ b/drivers/opus/silk/biquad_alt.c
@@ -0,0 +1,78 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+/*                                                                      *
+ * silk_biquad_alt.c                                              *
+ *                                                                      *
+ * Second order ARMA filter                                             *
+ * Can handle slowly varying filter coefficients                        *
+ *                                                                      */
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Second order ARMA filter, alternative implementation */
+void silk_biquad_alt(
+    const opus_int16            *in,                /* I     input signal                                               */
+    const opus_int32            *B_Q28,             /* I     MA coefficients [3]                                        */
+    const opus_int32            *A_Q28,             /* I     AR coefficients [2]                                        */
+    opus_int32                  *S,                 /* I/O   State vector [2]                                           */
+    opus_int16                  *out,               /* O     output signal                                              */
+    const opus_int32            len,                /* I     signal length (must be even)                               */
+    opus_int                    stride              /* I     Operate on interleaved signal if > 1                       */
+)
+{
+    /* DIRECT FORM II TRANSPOSED (uses 2 element state vector) */
+    opus_int   k;
+    opus_int32 inval, A0_U_Q28, A0_L_Q28, A1_U_Q28, A1_L_Q28, out32_Q14;
+
+    /* Negate A_Q28 values and split in two parts */
+    A0_L_Q28 = ( -A_Q28[ 0 ] ) & 0x00003FFF;        /* lower part */
+    A0_U_Q28 = silk_RSHIFT( -A_Q28[ 0 ], 14 );      /* upper part */
+    A1_L_Q28 = ( -A_Q28[ 1 ] ) & 0x00003FFF;        /* lower part */
+    A1_U_Q28 = silk_RSHIFT( -A_Q28[ 1 ], 14 );      /* upper part */
+
+    for( k = 0; k < len; k++ ) {
+        /* S[ 0 ], S[ 1 ]: Q12 */
+        inval = in[ k * stride ];
+        out32_Q14 = silk_LSHIFT( silk_SMLAWB( S[ 0 ], B_Q28[ 0 ], inval ), 2 );
+
+        S[ 0 ] = S[1] + silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14, A0_L_Q28 ), 14 );
+        S[ 0 ] = silk_SMLAWB( S[ 0 ], out32_Q14, A0_U_Q28 );
+        S[ 0 ] = silk_SMLAWB( S[ 0 ], B_Q28[ 1 ], inval);
+
+        S[ 1 ] = silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14, A1_L_Q28 ), 14 );
+        S[ 1 ] = silk_SMLAWB( S[ 1 ], out32_Q14, A1_U_Q28 );
+        S[ 1 ] = silk_SMLAWB( S[ 1 ], B_Q28[ 2 ], inval );
+
+        /* Scale back to Q0 and saturate */
+        out[ k * stride ] = (opus_int16)silk_SAT16( silk_RSHIFT( out32_Q14 + (1<<14) - 1, 14 ) );
+    }
+}
diff --git a/drivers/opus/silk/bwexpander.c b/drivers/opus/silk/bwexpander.c
new file mode 100644
index 0000000000..d757483872
--- /dev/null
+++ b/drivers/opus/silk/bwexpander.c
@@ -0,0 +1,51 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Chirp (bandwidth expand) LP AR filter */
+void silk_bwexpander(
+    opus_int16                  *ar,                /* I/O  AR filter to be expanded (without leading 1)                */
+    const opus_int              d,                  /* I    Length of ar                                                */
+    opus_int32                  chirp_Q16           /* I    Chirp factor (typically in the range 0 to 1)                */
+)
+{
+    opus_int   i;
+    opus_int32 chirp_minus_one_Q16 = chirp_Q16 - 65536;
+
+    /* NB: Dont use silk_SMULWB, instead of silk_RSHIFT_ROUND( silk_MUL(), 16 ), below.  */
+    /* Bias in silk_SMULWB can lead to unstable filters                                */
+    for( i = 0; i < d - 1; i++ ) {
+        ar[ i ]    = (opus_int16)silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, ar[ i ]             ), 16 );
+        chirp_Q16 +=            silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, chirp_minus_one_Q16 ), 16 );
+    }
+    ar[ d - 1 ] = (opus_int16)silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, ar[ d - 1 ] ), 16 );
+}
diff --git a/drivers/opus/silk/bwexpander_32.c b/drivers/opus/silk/bwexpander_32.c
new file mode 100644
index 0000000000..8a60767c0d
--- /dev/null
+++ b/drivers/opus/silk/bwexpander_32.c
@@ -0,0 +1,50 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Chirp (bandwidth expand) LP AR filter */
+void silk_bwexpander_32(
+    opus_int32                  *ar,                /* I/O  AR filter to be expanded (without leading 1)                */
+    const opus_int              d,                  /* I    Length of ar                                                */
+    opus_int32                  chirp_Q16           /* I    Chirp factor in Q16                                         */
+)
+{
+    opus_int   i;
+    opus_int32 chirp_minus_one_Q16 = chirp_Q16 - 65536;
+
+    for( i = 0; i < d - 1; i++ ) {
+        ar[ i ]    = silk_SMULWW( chirp_Q16, ar[ i ] );
+        chirp_Q16 += silk_RSHIFT_ROUND( silk_MUL( chirp_Q16, chirp_minus_one_Q16 ), 16 );
+    }
+    ar[ d - 1 ] = silk_SMULWW( chirp_Q16, ar[ d - 1 ] );
+}
+
diff --git a/drivers/opus/silk/check_control_input.c b/drivers/opus/silk/check_control_input.c
new file mode 100644
index 0000000000..0e02fff22d
--- /dev/null
+++ b/drivers/opus/silk/check_control_input.c
@@ -0,0 +1,106 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "control.h"
+#include "errors.h"
+
+/* Check encoder control struct */
+opus_int check_control_input(
+    silk_EncControlStruct        *encControl                    /* I    Control structure                           */
+)
+{
+    silk_assert( encControl != NULL );
+
+    if( ( ( encControl->API_sampleRate            !=  8000 ) &&
+          ( encControl->API_sampleRate            != 12000 ) &&
+          ( encControl->API_sampleRate            != 16000 ) &&
+          ( encControl->API_sampleRate            != 24000 ) &&
+          ( encControl->API_sampleRate            != 32000 ) &&
+          ( encControl->API_sampleRate            != 44100 ) &&
+          ( encControl->API_sampleRate            != 48000 ) ) ||
+        ( ( encControl->desiredInternalSampleRate !=  8000 ) &&
+          ( encControl->desiredInternalSampleRate != 12000 ) &&
+          ( encControl->desiredInternalSampleRate != 16000 ) ) ||
+        ( ( encControl->maxInternalSampleRate     !=  8000 ) &&
+          ( encControl->maxInternalSampleRate     != 12000 ) &&
+          ( encControl->maxInternalSampleRate     != 16000 ) ) ||
+        ( ( encControl->minInternalSampleRate     !=  8000 ) &&
+          ( encControl->minInternalSampleRate     != 12000 ) &&
+          ( encControl->minInternalSampleRate     != 16000 ) ) ||
+          ( encControl->minInternalSampleRate > encControl->desiredInternalSampleRate ) ||
+          ( encControl->maxInternalSampleRate < encControl->desiredInternalSampleRate ) ||
+          ( encControl->minInternalSampleRate > encControl->maxInternalSampleRate ) ) {
+        silk_assert( 0 );
+        return SILK_ENC_FS_NOT_SUPPORTED;
+    }
+    if( encControl->payloadSize_ms != 10 &&
+        encControl->payloadSize_ms != 20 &&
+        encControl->payloadSize_ms != 40 &&
+        encControl->payloadSize_ms != 60 ) {
+        silk_assert( 0 );
+        return SILK_ENC_PACKET_SIZE_NOT_SUPPORTED;
+    }
+    if( encControl->packetLossPercentage < 0 || encControl->packetLossPercentage > 100 ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_LOSS_RATE;
+    }
+    if( encControl->useDTX < 0 || encControl->useDTX > 1 ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_DTX_SETTING;
+    }
+    if( encControl->useCBR < 0 || encControl->useCBR > 1 ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_CBR_SETTING;
+    }
+    if( encControl->useInBandFEC < 0 || encControl->useInBandFEC > 1 ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_INBAND_FEC_SETTING;
+    }
+    if( encControl->nChannelsAPI < 1 || encControl->nChannelsAPI > ENCODER_NUM_CHANNELS ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_NUMBER_OF_CHANNELS_ERROR;
+    }
+    if( encControl->nChannelsInternal < 1 || encControl->nChannelsInternal > ENCODER_NUM_CHANNELS ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_NUMBER_OF_CHANNELS_ERROR;
+    }
+    if( encControl->nChannelsInternal > encControl->nChannelsAPI ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_NUMBER_OF_CHANNELS_ERROR;
+    }
+    if( encControl->complexity < 0 || encControl->complexity > 10 ) {
+        silk_assert( 0 );
+        return SILK_ENC_INVALID_COMPLEXITY_SETTING;
+    }
+
+    return SILK_NO_ERROR;
+}
diff --git a/drivers/opus/silk/code_signs.c b/drivers/opus/silk/code_signs.c
new file mode 100644
index 0000000000..8bcc6ecde1
--- /dev/null
+++ b/drivers/opus/silk/code_signs.c
@@ -0,0 +1,115 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/*#define silk_enc_map(a)                ((a) > 0 ? 1 : 0)*/
+/*#define silk_dec_map(a)                ((a) > 0 ? 1 : -1)*/
+/* shifting avoids if-statement */
+#define silk_enc_map(a)                  ( silk_RSHIFT( (a), 15 ) + 1 )
+#define silk_dec_map(a)                  ( silk_LSHIFT( (a),  1 ) - 1 )
+
+/* Encodes signs of excitation */
+void silk_encode_signs(
+    ec_enc                      *psRangeEnc,                        /* I/O  Compressor data structure                   */
+    const opus_int8             pulses[],                           /* I    pulse signal                                */
+    opus_int                    length,                             /* I    length of input                             */
+    const opus_int              signalType,                         /* I    Signal type                                 */
+    const opus_int              quantOffsetType,                    /* I    Quantization offset type                    */
+    const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
+)
+{
+    opus_int         i, j, p;
+    opus_uint8       icdf[ 2 ];
+    const opus_int8  *q_ptr;
+    const opus_uint8 *icdf_ptr;
+
+    icdf[ 1 ] = 0;
+    q_ptr = pulses;
+    i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
+    icdf_ptr = &silk_sign_iCDF[ i ];
+    length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
+    for( i = 0; i < length; i++ ) {
+        p = sum_pulses[ i ];
+        if( p > 0 ) {
+            icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
+            for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
+                if( q_ptr[ j ] != 0 ) {
+                    ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 );
+                }
+            }
+        }
+        q_ptr += SHELL_CODEC_FRAME_LENGTH;
+    }
+}
+
+/* Decodes signs of excitation */
+void silk_decode_signs(
+    ec_dec                      *psRangeDec,                        /* I/O  Compressor data structure                   */
+    opus_int                    pulses[],                           /* I/O  pulse signal                                */
+    opus_int                    length,                             /* I    length of input                             */
+    const opus_int              signalType,                         /* I    Signal type                                 */
+    const opus_int              quantOffsetType,                    /* I    Quantization offset type                    */
+    const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
+)
+{
+    opus_int         i, j, p;
+    opus_uint8       icdf[ 2 ];
+    opus_int         *q_ptr;
+    const opus_uint8 *icdf_ptr;
+
+    icdf[ 1 ] = 0;
+    q_ptr = pulses;
+    i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
+    icdf_ptr = &silk_sign_iCDF[ i ];
+    length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
+    for( i = 0; i < length; i++ ) {
+        p = sum_pulses[ i ];
+        if( p > 0 ) {
+            icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
+            for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
+                if( q_ptr[ j ] > 0 ) {
+                    /* attach sign */
+#if 0
+                    /* conditional implementation */
+                    if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) {
+                        q_ptr[ j ] = -q_ptr[ j ];
+                    }
+#else
+                    /* implementation with shift, subtraction, multiplication */
+                    q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) );
+#endif
+                }
+            }
+        }
+        q_ptr += SHELL_CODEC_FRAME_LENGTH;
+    }
+}
diff --git a/drivers/opus/silk/control.h b/drivers/opus/silk/control.h
new file mode 100644
index 0000000000..747e5426a0
--- /dev/null
+++ b/drivers/opus/silk/control.h
@@ -0,0 +1,142 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_CONTROL_H
+#define SILK_CONTROL_H
+
+#include "typedef.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* Decoder API flags */
+#define FLAG_DECODE_NORMAL                      0
+#define FLAG_PACKET_LOST                        1
+#define FLAG_DECODE_LBRR                        2
+
+/***********************************************/
+/* Structure for controlling encoder operation */
+/***********************************************/
+typedef struct {
+    /* I:   Number of channels; 1/2                                                         */
+    opus_int32 nChannelsAPI;
+
+    /* I:   Number of channels; 1/2                                                         */
+    opus_int32 nChannelsInternal;
+
+    /* I:   Input signal sampling rate in Hertz; 8000/12000/16000/24000/32000/44100/48000   */
+    opus_int32 API_sampleRate;
+
+    /* I:   Maximum internal sampling rate in Hertz; 8000/12000/16000                       */
+    opus_int32 maxInternalSampleRate;
+
+    /* I:   Minimum internal sampling rate in Hertz; 8000/12000/16000                       */
+    opus_int32 minInternalSampleRate;
+
+    /* I:   Soft request for internal sampling rate in Hertz; 8000/12000/16000              */
+    opus_int32 desiredInternalSampleRate;
+
+    /* I:   Number of samples per packet in milliseconds; 10/20/40/60                       */
+    opus_int payloadSize_ms;
+
+    /* I:   Bitrate during active speech in bits/second; internally limited                 */
+    opus_int32 bitRate;
+
+    /* I:   Uplink packet loss in percent (0-100)                                           */
+    opus_int packetLossPercentage;
+
+    /* I:   Complexity mode; 0 is lowest, 10 is highest complexity                          */
+    opus_int complexity;
+
+    /* I:   Flag to enable in-band Forward Error Correction (FEC); 0/1                      */
+    opus_int useInBandFEC;
+
+    /* I:   Flag to enable discontinuous transmission (DTX); 0/1                            */
+    opus_int useDTX;
+
+    /* I:   Flag to use constant bitrate                                                    */
+    opus_int useCBR;
+
+    /* I:   Maximum number of bits allowed for the frame                                    */
+    opus_int maxBits;
+
+    /* I:   Causes a smooth downmix to mono                                                 */
+    opus_int toMono;
+
+    /* I:   Opus encoder is allowing us to switch bandwidth                                 */
+    opus_int opusCanSwitch;
+
+    /* I: Make frames as independent as possible (but still use LPC)                        */
+    opus_int reducedDependency;
+
+    /* O:   Internal sampling rate used, in Hertz; 8000/12000/16000                         */
+    opus_int32 internalSampleRate;
+
+    /* O: Flag that bandwidth switching is allowed (because low voice activity)             */
+    opus_int allowBandwidthSwitch;
+
+    /* O:   Flag that SILK runs in WB mode without variable LP filter (use for switching between WB/SWB/FB) */
+    opus_int inWBmodeWithoutVariableLP;
+
+    /* O:   Stereo width */
+    opus_int stereoWidth_Q14;
+
+    /* O:   Tells the Opus encoder we're ready to switch                                    */
+    opus_int switchReady;
+
+} silk_EncControlStruct;
+
+/**************************************************************************/
+/* Structure for controlling decoder operation and reading decoder status */
+/**************************************************************************/
+typedef struct {
+    /* I:   Number of channels; 1/2                                                         */
+    opus_int32 nChannelsAPI;
+
+    /* I:   Number of channels; 1/2                                                         */
+    opus_int32 nChannelsInternal;
+
+    /* I:   Output signal sampling rate in Hertz; 8000/12000/16000/24000/32000/44100/48000  */
+    opus_int32 API_sampleRate;
+
+    /* I:   Internal sampling rate used, in Hertz; 8000/12000/16000                         */
+    opus_int32 internalSampleRate;
+
+    /* I:   Number of samples per packet in milliseconds; 10/20/40/60                       */
+    opus_int payloadSize_ms;
+
+    /* O:   Pitch lag of previous frame (0 if unvoiced), measured in samples at 48 kHz      */
+    opus_int prevPitchLag;
+} silk_DecControlStruct;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/control_SNR.c b/drivers/opus/silk/control_SNR.c
new file mode 100644
index 0000000000..ae6351798b
--- /dev/null
+++ b/drivers/opus/silk/control_SNR.c
@@ -0,0 +1,81 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "tuning_parameters.h"
+
+/* Control SNR of redidual quantizer */
+opus_int silk_control_SNR(
+    silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
+    opus_int32                  TargetRate_bps                  /* I    Target max bitrate (bps)                    */
+)
+{
+    opus_int k, ret = SILK_NO_ERROR;
+    opus_int32 frac_Q6;
+    const opus_int32 *rateTable;
+
+    /* Set bitrate/coding quality */
+    TargetRate_bps = silk_LIMIT( TargetRate_bps, MIN_TARGET_RATE_BPS, MAX_TARGET_RATE_BPS );
+    if( TargetRate_bps != psEncC->TargetRate_bps ) {
+        psEncC->TargetRate_bps = TargetRate_bps;
+
+        /* If new TargetRate_bps, translate to SNR_dB value */
+        if( psEncC->fs_kHz == 8 ) {
+            rateTable = silk_TargetRate_table_NB;
+        } else if( psEncC->fs_kHz == 12 ) {
+            rateTable = silk_TargetRate_table_MB;
+        } else {
+            rateTable = silk_TargetRate_table_WB;
+        }
+
+        /* Reduce bitrate for 10 ms modes in these calculations */
+        if( psEncC->nb_subfr == 2 ) {
+            TargetRate_bps -= REDUCE_BITRATE_10_MS_BPS;
+        }
+
+        /* Find bitrate interval in table and interpolate */
+        for( k = 1; k < TARGET_RATE_TAB_SZ; k++ ) {
+            if( TargetRate_bps <= rateTable[ k ] ) {
+                frac_Q6 = silk_DIV32( silk_LSHIFT( TargetRate_bps - rateTable[ k - 1 ], 6 ),
+                                                 rateTable[ k ] - rateTable[ k - 1 ] );
+                psEncC->SNR_dB_Q7 = silk_LSHIFT( silk_SNR_table_Q1[ k - 1 ], 6 ) + silk_MUL( frac_Q6, silk_SNR_table_Q1[ k ] - silk_SNR_table_Q1[ k - 1 ] );
+                break;
+            }
+        }
+
+        /* Reduce coding quality whenever LBRR is enabled, to free up some bits */
+        if( psEncC->LBRR_enabled ) {
+            psEncC->SNR_dB_Q7 = silk_SMLABB( psEncC->SNR_dB_Q7, 12 - psEncC->LBRR_GainIncreases, SILK_FIX_CONST( -0.25, 7 ) );
+        }
+    }
+
+    return ret;
+}
diff --git a/drivers/opus/silk/control_audio_bandwidth.c b/drivers/opus/silk/control_audio_bandwidth.c
new file mode 100644
index 0000000000..6f060bbd29
--- /dev/null
+++ b/drivers/opus/silk/control_audio_bandwidth.c
@@ -0,0 +1,126 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "tuning_parameters.h"
+
+/* Control internal sampling rate */
+opus_int silk_control_audio_bandwidth(
+    silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
+    silk_EncControlStruct       *encControl                     /* I    Control structure                           */
+)
+{
+    opus_int   fs_kHz;
+    opus_int32 fs_Hz;
+
+    fs_kHz = psEncC->fs_kHz;
+    fs_Hz = silk_SMULBB( fs_kHz, 1000 );
+    if( fs_Hz == 0 ) {
+        /* Encoder has just been initialized */
+        fs_Hz  = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz );
+        fs_kHz = silk_DIV32_16( fs_Hz, 1000 );
+    } else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) {
+        /* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */
+        fs_Hz  = psEncC->API_fs_Hz;
+        fs_Hz  = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz );
+        fs_Hz  = silk_max( fs_Hz, psEncC->minInternal_fs_Hz );
+        fs_kHz = silk_DIV32_16( fs_Hz, 1000 );
+    } else {
+        /* State machine for the internal sampling rate switching */
+        if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) {
+            /* Stop transition phase */
+            psEncC->sLP.mode = 0;
+        }
+        if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) {
+            /* Check if we should switch down */
+            if( silk_SMULBB( psEncC->fs_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz )
+            {
+                /* Switch down */
+                if( psEncC->sLP.mode == 0 ) {
+                    /* New transition */
+                    psEncC->sLP.transition_frame_no = TRANSITION_FRAMES;
+
+                    /* Reset transition filter state */
+                    silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) );
+                }
+                if( encControl->opusCanSwitch ) {
+                    /* Stop transition phase */
+                    psEncC->sLP.mode = 0;
+
+                    /* Switch to a lower sample frequency */
+                    fs_kHz = psEncC->fs_kHz == 16 ? 12 : 8;
+                } else {
+                   if( psEncC->sLP.transition_frame_no <= 0 ) {
+                       encControl->switchReady = 1;
+                       /* Make room for redundancy */
+                       encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 );
+                   } else {
+                       /* Direction: down (at double speed) */
+                       psEncC->sLP.mode = -2;
+                   }
+                }
+            }
+            else
+            /* Check if we should switch up */
+            if( silk_SMULBB( psEncC->fs_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz )
+            {
+                /* Switch up */
+                if( encControl->opusCanSwitch ) {
+                    /* Switch to a higher sample frequency */
+                    fs_kHz = psEncC->fs_kHz == 8 ? 12 : 16;
+
+                    /* New transition */
+                    psEncC->sLP.transition_frame_no = 0;
+
+                    /* Reset transition filter state */
+                    silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) );
+
+                    /* Direction: up */
+                    psEncC->sLP.mode = 1;
+                } else {
+                   if( psEncC->sLP.mode == 0 ) {
+                       encControl->switchReady = 1;
+                       /* Make room for redundancy */
+                       encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 );
+                   } else {
+                       /* Direction: up */
+                       psEncC->sLP.mode = 1;
+                   }
+                }
+            } else {
+               if (psEncC->sLP.mode<0)
+                  psEncC->sLP.mode = 1;
+            }
+        }
+    }
+
+    return fs_kHz;
+}
diff --git a/drivers/opus/silk/control_codec.c b/drivers/opus/silk/control_codec.c
new file mode 100644
index 0000000000..2d7b10e9b7
--- /dev/null
+++ b/drivers/opus/silk/control_codec.c
@@ -0,0 +1,422 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+#ifdef OPUS_FIXED_POINT
+#include "main_FIX.h"
+#define silk_encoder_state_Fxx      silk_encoder_state_FIX
+#else
+#include "main_FLP.h"
+#define silk_encoder_state_Fxx      silk_encoder_state_FLP
+#endif
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+#include "pitch_est_defines.h"
+
+static opus_int silk_setup_resamplers(
+    silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
+    opus_int                        fs_kHz              /* I                        */
+);
+
+static opus_int silk_setup_fs(
+    silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
+    opus_int                        fs_kHz,             /* I                        */
+    opus_int                        PacketSize_ms       /* I                        */
+);
+
+static opus_int silk_setup_complexity(
+    silk_encoder_state              *psEncC,            /* I/O                      */
+    opus_int                        Complexity          /* I                        */
+);
+
+static OPUS_INLINE opus_int silk_setup_LBRR(
+    silk_encoder_state              *psEncC,            /* I/O                      */
+    const opus_int32                TargetRate_bps      /* I                        */
+);
+
+
+/* Control encoder */
+opus_int silk_control_encoder(
+    silk_encoder_state_Fxx          *psEnc,                                 /* I/O  Pointer to Silk encoder state                                               */
+    silk_EncControlStruct           *encControl,                            /* I    Control structure                                                           */
+    const opus_int32                TargetRate_bps,                         /* I    Target max bitrate (bps)                                                    */
+    const opus_int                  allow_bw_switch,                        /* I    Flag to allow switching audio bandwidth                                     */
+    const opus_int                  channelNb,                              /* I    Channel number                                                              */
+    const opus_int                  force_fs_kHz
+)
+{
+    opus_int   fs_kHz, ret = 0;
+
+    psEnc->sCmn.useDTX                 = encControl->useDTX;
+    psEnc->sCmn.useCBR                 = encControl->useCBR;
+    psEnc->sCmn.API_fs_Hz              = encControl->API_sampleRate;
+    psEnc->sCmn.maxInternal_fs_Hz      = encControl->maxInternalSampleRate;
+    psEnc->sCmn.minInternal_fs_Hz      = encControl->minInternalSampleRate;
+    psEnc->sCmn.desiredInternal_fs_Hz  = encControl->desiredInternalSampleRate;
+    psEnc->sCmn.useInBandFEC           = encControl->useInBandFEC;
+    psEnc->sCmn.nChannelsAPI           = encControl->nChannelsAPI;
+    psEnc->sCmn.nChannelsInternal      = encControl->nChannelsInternal;
+    psEnc->sCmn.allow_bandwidth_switch = allow_bw_switch;
+    psEnc->sCmn.channelNb              = channelNb;
+
+    if( psEnc->sCmn.controlled_since_last_payload != 0 && psEnc->sCmn.prefillFlag == 0 ) {
+        if( psEnc->sCmn.API_fs_Hz != psEnc->sCmn.prev_API_fs_Hz && psEnc->sCmn.fs_kHz > 0 ) {
+            /* Change in API sampling rate in the middle of encoding a packet */
+            ret += silk_setup_resamplers( psEnc, psEnc->sCmn.fs_kHz );
+        }
+        return ret;
+    }
+
+    /* Beyond this point we know that there are no previously coded frames in the payload buffer */
+
+    /********************************************/
+    /* Determine internal sampling rate         */
+    /********************************************/
+    fs_kHz = silk_control_audio_bandwidth( &psEnc->sCmn, encControl );
+    if( force_fs_kHz ) {
+       fs_kHz = force_fs_kHz;
+    }
+    /********************************************/
+    /* Prepare resampler and buffered data      */
+    /********************************************/
+    ret += silk_setup_resamplers( psEnc, fs_kHz );
+
+    /********************************************/
+    /* Set internal sampling frequency          */
+    /********************************************/
+    ret += silk_setup_fs( psEnc, fs_kHz, encControl->payloadSize_ms );
+
+    /********************************************/
+    /* Set encoding complexity                  */
+    /********************************************/
+    ret += silk_setup_complexity( &psEnc->sCmn, encControl->complexity  );
+
+    /********************************************/
+    /* Set packet loss rate measured by farend  */
+    /********************************************/
+    psEnc->sCmn.PacketLoss_perc = encControl->packetLossPercentage;
+
+    /********************************************/
+    /* Set LBRR usage                           */
+    /********************************************/
+    ret += silk_setup_LBRR( &psEnc->sCmn, TargetRate_bps );
+
+    psEnc->sCmn.controlled_since_last_payload = 1;
+
+    return ret;
+}
+
+static opus_int silk_setup_resamplers(
+    silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
+    opus_int                         fs_kHz              /* I                        */
+)
+{
+    opus_int   ret = SILK_NO_ERROR;
+    SAVE_STACK;
+
+    if( psEnc->sCmn.fs_kHz != fs_kHz || psEnc->sCmn.prev_API_fs_Hz != psEnc->sCmn.API_fs_Hz )
+    {
+        if( psEnc->sCmn.fs_kHz == 0 ) {
+            /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
+            ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000, 1 );
+        } else {
+            VARDECL( opus_int16, x_buf_API_fs_Hz );
+            VARDECL( silk_resampler_state_struct, temp_resampler_state );
+#ifdef OPUS_FIXED_POINT
+            opus_int16 *x_bufFIX = psEnc->x_buf;
+#else
+            VARDECL( opus_int16, x_bufFIX );
+            opus_int32 new_buf_samples;
+#endif
+            opus_int32 api_buf_samples;
+            opus_int32 old_buf_samples;
+            opus_int32 buf_length_ms;
+
+            buf_length_ms = silk_LSHIFT( psEnc->sCmn.nb_subfr * 5, 1 ) + LA_SHAPE_MS;
+            old_buf_samples = buf_length_ms * psEnc->sCmn.fs_kHz;
+
+#ifndef OPUS_FIXED_POINT
+            new_buf_samples = buf_length_ms * fs_kHz;
+            ALLOC( x_bufFIX, silk_max( old_buf_samples, new_buf_samples ),
+                   opus_int16 );
+            silk_float2short_array( x_bufFIX, psEnc->x_buf, old_buf_samples );
+#endif
+
+            /* Initialize resampler for temporary resampling of x_buf data to API_fs_Hz */
+            ALLOC( temp_resampler_state, 1, silk_resampler_state_struct );
+            ret += silk_resampler_init( temp_resampler_state, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ), psEnc->sCmn.API_fs_Hz, 0 );
+
+            /* Calculate number of samples to temporarily upsample */
+            api_buf_samples = buf_length_ms * silk_DIV32_16( psEnc->sCmn.API_fs_Hz, 1000 );
+
+            /* Temporary resampling of x_buf data to API_fs_Hz */
+            ALLOC( x_buf_API_fs_Hz, api_buf_samples, opus_int16 );
+            ret += silk_resampler( temp_resampler_state, x_buf_API_fs_Hz, x_bufFIX, old_buf_samples );
+
+            /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
+            ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, silk_SMULBB( fs_kHz, 1000 ), 1 );
+
+            /* Correct resampler state by resampling buffered data from API_fs_Hz to fs_kHz */
+            ret += silk_resampler( &psEnc->sCmn.resampler_state, x_bufFIX, x_buf_API_fs_Hz, api_buf_samples );
+
+#ifndef OPUS_FIXED_POINT
+            silk_short2float_array( psEnc->x_buf, x_bufFIX, new_buf_samples);
+#endif
+        }
+    }
+
+    psEnc->sCmn.prev_API_fs_Hz = psEnc->sCmn.API_fs_Hz;
+
+    RESTORE_STACK;
+    return ret;
+}
+
+static opus_int silk_setup_fs(
+    silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
+    opus_int                        fs_kHz,             /* I                        */
+    opus_int                        PacketSize_ms       /* I                        */
+)
+{
+    opus_int ret = SILK_NO_ERROR;
+
+    /* Set packet size */
+    if( PacketSize_ms != psEnc->sCmn.PacketSize_ms ) {
+        if( ( PacketSize_ms !=  10 ) &&
+            ( PacketSize_ms !=  20 ) &&
+            ( PacketSize_ms !=  40 ) &&
+            ( PacketSize_ms !=  60 ) ) {
+            ret = SILK_ENC_PACKET_SIZE_NOT_SUPPORTED;
+        }
+        if( PacketSize_ms <= 10 ) {
+            psEnc->sCmn.nFramesPerPacket = 1;
+            psEnc->sCmn.nb_subfr = PacketSize_ms == 10 ? 2 : 1;
+            psEnc->sCmn.frame_length = silk_SMULBB( PacketSize_ms, fs_kHz );
+            psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
+            if( psEnc->sCmn.fs_kHz == 8 ) {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
+            } else {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
+            }
+        } else {
+            psEnc->sCmn.nFramesPerPacket = silk_DIV32_16( PacketSize_ms, MAX_FRAME_LENGTH_MS );
+            psEnc->sCmn.nb_subfr = MAX_NB_SUBFR;
+            psEnc->sCmn.frame_length = silk_SMULBB( 20, fs_kHz );
+            psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
+            if( psEnc->sCmn.fs_kHz == 8 ) {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
+            } else {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
+            }
+        }
+        psEnc->sCmn.PacketSize_ms  = PacketSize_ms;
+        psEnc->sCmn.TargetRate_bps = 0;         /* trigger new SNR computation */
+    }
+
+    /* Set internal sampling frequency */
+    silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
+    silk_assert( psEnc->sCmn.nb_subfr == 2 || psEnc->sCmn.nb_subfr == 4 );
+    if( psEnc->sCmn.fs_kHz != fs_kHz ) {
+        /* reset part of the state */
+        silk_memset( &psEnc->sShape,               0, sizeof( psEnc->sShape ) );
+        silk_memset( &psEnc->sPrefilt,             0, sizeof( psEnc->sPrefilt ) );
+        silk_memset( &psEnc->sCmn.sNSQ,            0, sizeof( psEnc->sCmn.sNSQ ) );
+        silk_memset( psEnc->sCmn.prev_NLSFq_Q15,   0, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
+        silk_memset( &psEnc->sCmn.sLP.In_LP_State, 0, sizeof( psEnc->sCmn.sLP.In_LP_State ) );
+        psEnc->sCmn.inputBufIx                  = 0;
+        psEnc->sCmn.nFramesEncoded              = 0;
+        psEnc->sCmn.TargetRate_bps              = 0;     /* trigger new SNR computation */
+
+        /* Initialize non-zero parameters */
+        psEnc->sCmn.prevLag                     = 100;
+        psEnc->sCmn.first_frame_after_reset     = 1;
+        psEnc->sPrefilt.lagPrev                 = 100;
+        psEnc->sShape.LastGainIndex             = 10;
+        psEnc->sCmn.sNSQ.lagPrev                = 100;
+        psEnc->sCmn.sNSQ.prev_gain_Q16          = 65536;
+        psEnc->sCmn.prevSignalType              = TYPE_NO_VOICE_ACTIVITY;
+
+        psEnc->sCmn.fs_kHz = fs_kHz;
+        if( psEnc->sCmn.fs_kHz == 8 ) {
+            if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
+            } else {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
+            }
+        } else {
+            if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
+            } else {
+                psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
+            }
+        }
+        if( psEnc->sCmn.fs_kHz == 8 || psEnc->sCmn.fs_kHz == 12 ) {
+            psEnc->sCmn.predictLPCOrder = MIN_LPC_ORDER;
+            psEnc->sCmn.psNLSF_CB  = &silk_NLSF_CB_NB_MB;
+        } else {
+            psEnc->sCmn.predictLPCOrder = MAX_LPC_ORDER;
+            psEnc->sCmn.psNLSF_CB  = &silk_NLSF_CB_WB;
+        }
+        psEnc->sCmn.subfr_length   = SUB_FRAME_LENGTH_MS * fs_kHz;
+        psEnc->sCmn.frame_length   = silk_SMULBB( psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr );
+        psEnc->sCmn.ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
+        psEnc->sCmn.la_pitch       = silk_SMULBB( LA_PITCH_MS, fs_kHz );
+        psEnc->sCmn.max_pitch_lag  = silk_SMULBB( 18, fs_kHz );
+        if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
+            psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
+        } else {
+            psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
+        }
+        if( psEnc->sCmn.fs_kHz == 16 ) {
+            psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_WB, 9 );
+            psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
+        } else if( psEnc->sCmn.fs_kHz == 12 ) {
+            psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_MB, 9 );
+            psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
+        } else {
+            psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_NB, 9 );
+            psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
+        }
+    }
+
+    /* Check that settings are valid */
+    silk_assert( ( psEnc->sCmn.subfr_length * psEnc->sCmn.nb_subfr ) == psEnc->sCmn.frame_length );
+
+    return ret;
+}
+
+static opus_int silk_setup_complexity(
+    silk_encoder_state              *psEncC,            /* I/O                      */
+    opus_int                        Complexity          /* I                        */
+)
+{
+    opus_int ret = 0;
+
+    /* Set encoding complexity */
+    silk_assert( Complexity >= 0 && Complexity <= 10 );
+    if( Complexity < 2 ) {
+        psEncC->pitchEstimationComplexity       = SILK_PE_MIN_COMPLEX;
+        psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.8, 16 );
+        psEncC->pitchEstimationLPCOrder         = 6;
+        psEncC->shapingLPCOrder                 = 8;
+        psEncC->la_shape                        = 3 * psEncC->fs_kHz;
+        psEncC->nStatesDelayedDecision          = 1;
+        psEncC->useInterpolatedNLSFs            = 0;
+        psEncC->LTPQuantLowComplexity           = 1;
+        psEncC->NLSF_MSVQ_Survivors             = 2;
+        psEncC->warping_Q16                     = 0;
+    } else if( Complexity < 4 ) {
+        psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
+        psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.76, 16 );
+        psEncC->pitchEstimationLPCOrder         = 8;
+        psEncC->shapingLPCOrder                 = 10;
+        psEncC->la_shape                        = 5 * psEncC->fs_kHz;
+        psEncC->nStatesDelayedDecision          = 1;
+        psEncC->useInterpolatedNLSFs            = 0;
+        psEncC->LTPQuantLowComplexity           = 0;
+        psEncC->NLSF_MSVQ_Survivors             = 4;
+        psEncC->warping_Q16                     = 0;
+    } else if( Complexity < 6 ) {
+        psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
+        psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.74, 16 );
+        psEncC->pitchEstimationLPCOrder         = 10;
+        psEncC->shapingLPCOrder                 = 12;
+        psEncC->la_shape                        = 5 * psEncC->fs_kHz;
+        psEncC->nStatesDelayedDecision          = 2;
+        psEncC->useInterpolatedNLSFs            = 1;
+        psEncC->LTPQuantLowComplexity           = 0;
+        psEncC->NLSF_MSVQ_Survivors             = 8;
+        psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
+    } else if( Complexity < 8 ) {
+        psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
+        psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.72, 16 );
+        psEncC->pitchEstimationLPCOrder         = 12;
+        psEncC->shapingLPCOrder                 = 14;
+        psEncC->la_shape                        = 5 * psEncC->fs_kHz;
+        psEncC->nStatesDelayedDecision          = 3;
+        psEncC->useInterpolatedNLSFs            = 1;
+        psEncC->LTPQuantLowComplexity           = 0;
+        psEncC->NLSF_MSVQ_Survivors             = 16;
+        psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
+    } else {
+        psEncC->pitchEstimationComplexity       = SILK_PE_MAX_COMPLEX;
+        psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.7, 16 );
+        psEncC->pitchEstimationLPCOrder         = 16;
+        psEncC->shapingLPCOrder                 = 16;
+        psEncC->la_shape                        = 5 * psEncC->fs_kHz;
+        psEncC->nStatesDelayedDecision          = MAX_DEL_DEC_STATES;
+        psEncC->useInterpolatedNLSFs            = 1;
+        psEncC->LTPQuantLowComplexity           = 0;
+        psEncC->NLSF_MSVQ_Survivors             = 32;
+        psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
+    }
+
+    /* Do not allow higher pitch estimation LPC order than predict LPC order */
+    psEncC->pitchEstimationLPCOrder = silk_min_int( psEncC->pitchEstimationLPCOrder, psEncC->predictLPCOrder );
+    psEncC->shapeWinLength          = SUB_FRAME_LENGTH_MS * psEncC->fs_kHz + 2 * psEncC->la_shape;
+    psEncC->Complexity              = Complexity;
+
+    silk_assert( psEncC->pitchEstimationLPCOrder <= MAX_FIND_PITCH_LPC_ORDER );
+    silk_assert( psEncC->shapingLPCOrder         <= MAX_SHAPE_LPC_ORDER      );
+    silk_assert( psEncC->nStatesDelayedDecision  <= MAX_DEL_DEC_STATES       );
+    silk_assert( psEncC->warping_Q16             <= 32767                    );
+    silk_assert( psEncC->la_shape                <= LA_SHAPE_MAX             );
+    silk_assert( psEncC->shapeWinLength          <= SHAPE_LPC_WIN_MAX        );
+    silk_assert( psEncC->NLSF_MSVQ_Survivors     <= NLSF_VQ_MAX_SURVIVORS    );
+
+    return ret;
+}
+
+static OPUS_INLINE opus_int silk_setup_LBRR(
+    silk_encoder_state          *psEncC,            /* I/O                      */
+    const opus_int32            TargetRate_bps      /* I                        */
+)
+{
+    opus_int   ret = SILK_NO_ERROR;
+    opus_int32 LBRR_rate_thres_bps;
+
+    psEncC->LBRR_enabled = 0;
+    if( psEncC->useInBandFEC && psEncC->PacketLoss_perc > 0 ) {
+        if( psEncC->fs_kHz == 8 ) {
+            LBRR_rate_thres_bps = LBRR_NB_MIN_RATE_BPS;
+        } else if( psEncC->fs_kHz == 12 ) {
+            LBRR_rate_thres_bps = LBRR_MB_MIN_RATE_BPS;
+        } else {
+            LBRR_rate_thres_bps = LBRR_WB_MIN_RATE_BPS;
+        }
+        LBRR_rate_thres_bps = silk_SMULWB( silk_MUL( LBRR_rate_thres_bps, 125 - silk_min( psEncC->PacketLoss_perc, 25 ) ), SILK_FIX_CONST( 0.01, 16 ) );
+
+        if( TargetRate_bps > LBRR_rate_thres_bps ) {
+            /* Set gain increase for coding LBRR excitation */
+            psEncC->LBRR_enabled = 1;
+            psEncC->LBRR_GainIncreases = silk_max_int( 7 - silk_SMULWB( (opus_int32)psEncC->PacketLoss_perc, SILK_FIX_CONST( 0.4, 16 ) ), 2 );
+        }
+    }
+
+    return ret;
+}
diff --git a/drivers/opus/silk/debug.c b/drivers/opus/silk/debug.c
new file mode 100644
index 0000000000..2230813fae
--- /dev/null
+++ b/drivers/opus/silk/debug.c
@@ -0,0 +1,170 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "debug.h"
+#include "SigProc_FIX.h"
+
+#if SILK_TIC_TOC
+
+#ifdef _WIN32
+
+#if (defined(_WIN32) || defined(_WINCE))
+#include <windows.h>    /* timer */
+#else   /* Linux or Mac*/
+#include <sys/time.h>
+#endif
+
+unsigned long silk_GetHighResolutionTime(void) /* O  time in usec*/
+{
+    /* Returns a time counter in microsec   */
+    /* the resolution is platform dependent */
+    /* but is typically 1.62 us resolution  */
+    LARGE_INTEGER lpPerformanceCount;
+    LARGE_INTEGER lpFrequency;
+    QueryPerformanceCounter(&lpPerformanceCount);
+    QueryPerformanceFrequency(&lpFrequency);
+    return (unsigned long)((1000000*(lpPerformanceCount.QuadPart)) / lpFrequency.QuadPart);
+}
+#else   /* Linux or Mac*/
+unsigned long GetHighResolutionTime(void) /* O  time in usec*/
+{
+    struct timeval tv;
+    gettimeofday(&tv, 0);
+    return((tv.tv_sec*1000000)+(tv.tv_usec));
+}
+#endif
+
+int           silk_Timer_nTimers = 0;
+int           silk_Timer_depth_ctr = 0;
+char          silk_Timer_tags[silk_NUM_TIMERS_MAX][silk_NUM_TIMERS_MAX_TAG_LEN];
+#ifdef WIN32
+LARGE_INTEGER silk_Timer_start[silk_NUM_TIMERS_MAX];
+#else
+unsigned long silk_Timer_start[silk_NUM_TIMERS_MAX];
+#endif
+unsigned int  silk_Timer_cnt[silk_NUM_TIMERS_MAX];
+opus_int64     silk_Timer_min[silk_NUM_TIMERS_MAX];
+opus_int64     silk_Timer_sum[silk_NUM_TIMERS_MAX];
+opus_int64     silk_Timer_max[silk_NUM_TIMERS_MAX];
+opus_int64     silk_Timer_depth[silk_NUM_TIMERS_MAX];
+
+#ifdef WIN32
+void silk_TimerSave(char *file_name)
+{
+    if( silk_Timer_nTimers > 0 )
+    {
+        int k;
+        FILE *fp;
+        LARGE_INTEGER lpFrequency;
+        LARGE_INTEGER lpPerformanceCount1, lpPerformanceCount2;
+        int del = 0x7FFFFFFF;
+        double avg, sum_avg;
+        /* estimate overhead of calling performance counters */
+        for( k = 0; k < 1000; k++ ) {
+            QueryPerformanceCounter(&lpPerformanceCount1);
+            QueryPerformanceCounter(&lpPerformanceCount2);
+            lpPerformanceCount2.QuadPart -= lpPerformanceCount1.QuadPart;
+            if( (int)lpPerformanceCount2.LowPart < del )
+                del = lpPerformanceCount2.LowPart;
+        }
+        QueryPerformanceFrequency(&lpFrequency);
+        /* print results to file */
+        sum_avg = 0.0f;
+        for( k = 0; k < silk_Timer_nTimers; k++ ) {
+            if (silk_Timer_depth[k] == 0) {
+                sum_avg += (1e6 * silk_Timer_sum[k] / silk_Timer_cnt[k] - del) / lpFrequency.QuadPart * silk_Timer_cnt[k];
+            }
+        }
+        fp = fopen(file_name, "w");
+        fprintf(fp, "                                min         avg     %%         max      count\n");
+        for( k = 0; k < silk_Timer_nTimers; k++ ) {
+            if (silk_Timer_depth[k] == 0) {
+                fprintf(fp, "%-28s", silk_Timer_tags[k]);
+            } else if (silk_Timer_depth[k] == 1) {
+                fprintf(fp, " %-27s", silk_Timer_tags[k]);
+            } else if (silk_Timer_depth[k] == 2) {
+                fprintf(fp, "  %-26s", silk_Timer_tags[k]);
+            } else if (silk_Timer_depth[k] == 3) {
+                fprintf(fp, "   %-25s", silk_Timer_tags[k]);
+            } else {
+                fprintf(fp, "    %-24s", silk_Timer_tags[k]);
+            }
+            avg = (1e6 * silk_Timer_sum[k] / silk_Timer_cnt[k] - del) / lpFrequency.QuadPart;
+            fprintf(fp, "%8.2f", (1e6 * (silk_max_64(silk_Timer_min[k] - del, 0))) / lpFrequency.QuadPart);
+            fprintf(fp, "%12.2f %6.2f", avg, 100.0 * avg / sum_avg * silk_Timer_cnt[k]);
+            fprintf(fp, "%12.2f", (1e6 * (silk_max_64(silk_Timer_max[k] - del, 0))) / lpFrequency.QuadPart);
+            fprintf(fp, "%10d\n", silk_Timer_cnt[k]);
+        }
+        fprintf(fp, "                                microseconds\n");
+        fclose(fp);
+    }
+}
+#else
+void silk_TimerSave(char *file_name)
+{
+    if( silk_Timer_nTimers > 0 )
+    {
+        int k;
+        FILE *fp;
+        /* print results to file */
+        fp = fopen(file_name, "w");
+        fprintf(fp, "                                min         avg         max      count\n");
+        for( k = 0; k < silk_Timer_nTimers; k++ )
+        {
+            if (silk_Timer_depth[k] == 0) {
+                fprintf(fp, "%-28s", silk_Timer_tags[k]);
+            } else if (silk_Timer_depth[k] == 1) {
+                fprintf(fp, " %-27s", silk_Timer_tags[k]);
+            } else if (silk_Timer_depth[k] == 2) {
+                fprintf(fp, "  %-26s", silk_Timer_tags[k]);
+            } else if (silk_Timer_depth[k] == 3) {
+                fprintf(fp, "   %-25s", silk_Timer_tags[k]);
+            } else {
+                fprintf(fp, "    %-24s", silk_Timer_tags[k]);
+            }
+            fprintf(fp, "%d ", silk_Timer_min[k]);
+            fprintf(fp, "%f ", (double)silk_Timer_sum[k] / (double)silk_Timer_cnt[k]);
+            fprintf(fp, "%d ", silk_Timer_max[k]);
+            fprintf(fp, "%10d\n", silk_Timer_cnt[k]);
+        }
+        fprintf(fp, "                                microseconds\n");
+        fclose(fp);
+    }
+}
+#endif
+
+#endif /* SILK_TIC_TOC */
+
+#if SILK_DEBUG
+FILE *silk_debug_store_fp[ silk_NUM_STORES_MAX ];
+int silk_debug_store_count = 0;
+#endif /* SILK_DEBUG */
+
diff --git a/drivers/opus/silk/debug.h b/drivers/opus/silk/debug.h
new file mode 100644
index 0000000000..efb6d3e99e
--- /dev/null
+++ b/drivers/opus/silk/debug.h
@@ -0,0 +1,279 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_DEBUG_H
+#define SILK_DEBUG_H
+
+#include "typedef.h"
+#include <stdio.h>      /* file writing */
+#include <string.h>     /* strcpy, strcmp */
+
+#ifdef  __cplusplus
+extern "C"
+{
+#endif
+
+unsigned long GetHighResolutionTime(void); /* O  time in usec*/
+
+/* make SILK_DEBUG dependent on compiler's _DEBUG */
+#if defined _WIN32
+    #ifdef _DEBUG
+        #define SILK_DEBUG  1
+    #else
+        #define SILK_DEBUG  0
+    #endif
+
+    /* overrule the above */
+    #if 0
+    /*  #define NO_ASSERTS*/
+    #undef  SILK_DEBUG
+    #define SILK_DEBUG  1
+    #endif
+#else
+    #define SILK_DEBUG  0
+#endif
+
+/* Flag for using timers */
+#define SILK_TIC_TOC    0
+
+
+#if SILK_TIC_TOC
+
+#if (defined(_WIN32) || defined(_WINCE))
+#include <windows.h>    /* timer */
+#else   /* Linux or Mac*/
+#include <sys/time.h>
+#endif
+
+/*********************************/
+/* timer functions for profiling */
+/*********************************/
+/* example:                                                         */
+/*                                                                  */
+/* TIC(LPC)                                                         */
+/* do_LPC(in_vec, order, acoef);    // do LPC analysis              */
+/* TOC(LPC)                                                         */
+/*                                                                  */
+/* and call the following just before exiting (from main)           */
+/*                                                                  */
+/* silk_TimerSave("silk_TimingData.txt");                           */
+/*                                                                  */
+/* results are now in silk_TimingData.txt                           */
+
+void silk_TimerSave(char *file_name);
+
+/* max number of timers (in different locations) */
+#define silk_NUM_TIMERS_MAX                  50
+/* max length of name tags in TIC(..), TOC(..) */
+#define silk_NUM_TIMERS_MAX_TAG_LEN          30
+
+extern int           silk_Timer_nTimers;
+extern int           silk_Timer_depth_ctr;
+extern char          silk_Timer_tags[silk_NUM_TIMERS_MAX][silk_NUM_TIMERS_MAX_TAG_LEN];
+#ifdef _WIN32
+extern LARGE_INTEGER silk_Timer_start[silk_NUM_TIMERS_MAX];
+#else
+extern unsigned long silk_Timer_start[silk_NUM_TIMERS_MAX];
+#endif
+extern unsigned int  silk_Timer_cnt[silk_NUM_TIMERS_MAX];
+extern opus_int64    silk_Timer_sum[silk_NUM_TIMERS_MAX];
+extern opus_int64    silk_Timer_max[silk_NUM_TIMERS_MAX];
+extern opus_int64    silk_Timer_min[silk_NUM_TIMERS_MAX];
+extern opus_int64    silk_Timer_depth[silk_NUM_TIMERS_MAX];
+
+/* WARNING: TIC()/TOC can measure only up to 0.1 seconds at a time */
+#ifdef _WIN32
+#define TIC(TAG_NAME) {                                     \
+    static int init = 0;                                    \
+    static int ID = -1;                                     \
+    if( init == 0 )                                         \
+    {                                                       \
+        int k;                                              \
+        init = 1;                                           \
+        for( k = 0; k < silk_Timer_nTimers; k++ ) {         \
+            if( strcmp(silk_Timer_tags[k], #TAG_NAME) == 0 ) { \
+                ID = k;                                     \
+                break;                                      \
+            }                                               \
+        }                                                   \
+        if (ID == -1) {                                     \
+            ID = silk_Timer_nTimers;                        \
+            silk_Timer_nTimers++;                           \
+            silk_Timer_depth[ID] = silk_Timer_depth_ctr;    \
+            strcpy(silk_Timer_tags[ID], #TAG_NAME);         \
+            silk_Timer_cnt[ID] = 0;                         \
+            silk_Timer_sum[ID] = 0;                         \
+            silk_Timer_min[ID] = 0xFFFFFFFF;                \
+            silk_Timer_max[ID] = 0;                         \
+        }                                                   \
+    }                                                       \
+    silk_Timer_depth_ctr++;                                 \
+    QueryPerformanceCounter(&silk_Timer_start[ID]);         \
+}
+#else
+#define TIC(TAG_NAME) {                                     \
+    static int init = 0;                                    \
+    static int ID = -1;                                     \
+    if( init == 0 )                                         \
+    {                                                       \
+        int k;                                              \
+        init = 1;                                           \
+        for( k = 0; k < silk_Timer_nTimers; k++ ) {         \
+        if( strcmp(silk_Timer_tags[k], #TAG_NAME) == 0 ) {  \
+                ID = k;                                     \
+                break;                                      \
+            }                                               \
+        }                                                   \
+        if (ID == -1) {                                     \
+            ID = silk_Timer_nTimers;                        \
+            silk_Timer_nTimers++;                           \
+            silk_Timer_depth[ID] = silk_Timer_depth_ctr;    \
+            strcpy(silk_Timer_tags[ID], #TAG_NAME);         \
+            silk_Timer_cnt[ID] = 0;                         \
+            silk_Timer_sum[ID] = 0;                         \
+            silk_Timer_min[ID] = 0xFFFFFFFF;                \
+            silk_Timer_max[ID] = 0;                         \
+        }                                                   \
+    }                                                       \
+    silk_Timer_depth_ctr++;                                 \
+    silk_Timer_start[ID] = GetHighResolutionTime();         \
+}
+#endif
+
+#ifdef _WIN32
+#define TOC(TAG_NAME) {                                             \
+    LARGE_INTEGER lpPerformanceCount;                               \
+    static int init = 0;                                            \
+    static int ID = 0;                                              \
+    if( init == 0 )                                                 \
+    {                                                               \
+        int k;                                                      \
+        init = 1;                                                   \
+        for( k = 0; k < silk_Timer_nTimers; k++ ) {                 \
+            if( strcmp(silk_Timer_tags[k], #TAG_NAME) == 0 ) {      \
+                ID = k;                                             \
+                break;                                              \
+            }                                                       \
+        }                                                           \
+    }                                                               \
+    QueryPerformanceCounter(&lpPerformanceCount);                   \
+    lpPerformanceCount.QuadPart -= silk_Timer_start[ID].QuadPart;   \
+    if((lpPerformanceCount.QuadPart < 100000000) &&                 \
+        (lpPerformanceCount.QuadPart >= 0)) {                       \
+        silk_Timer_cnt[ID]++;                                       \
+        silk_Timer_sum[ID] += lpPerformanceCount.QuadPart;          \
+        if( lpPerformanceCount.QuadPart > silk_Timer_max[ID] )      \
+            silk_Timer_max[ID] = lpPerformanceCount.QuadPart;       \
+        if( lpPerformanceCount.QuadPart < silk_Timer_min[ID] )      \
+            silk_Timer_min[ID] = lpPerformanceCount.QuadPart;       \
+    }                                                               \
+    silk_Timer_depth_ctr--;                                         \
+}
+#else
+#define TOC(TAG_NAME) {                                             \
+    unsigned long endTime;                                          \
+    static int init = 0;                                            \
+    static int ID = 0;                                              \
+    if( init == 0 )                                                 \
+    {                                                               \
+        int k;                                                      \
+        init = 1;                                                   \
+        for( k = 0; k < silk_Timer_nTimers; k++ ) {                 \
+            if( strcmp(silk_Timer_tags[k], #TAG_NAME) == 0 ) {      \
+                ID = k;                                             \
+                break;                                              \
+            }                                                       \
+        }                                                           \
+    }                                                               \
+    endTime = GetHighResolutionTime();                              \
+    endTime -= silk_Timer_start[ID];                                \
+    if((endTime < 100000000) &&                                     \
+        (endTime >= 0)) {                                           \
+        silk_Timer_cnt[ID]++;                                       \
+        silk_Timer_sum[ID] += endTime;                              \
+        if( endTime > silk_Timer_max[ID] )                          \
+            silk_Timer_max[ID] = endTime;                           \
+        if( endTime < silk_Timer_min[ID] )                          \
+            silk_Timer_min[ID] = endTime;                           \
+    }                                                               \
+        silk_Timer_depth_ctr--;                                     \
+}
+#endif
+
+#else /* SILK_TIC_TOC */
+
+/* define macros as empty strings */
+#define TIC(TAG_NAME)
+#define TOC(TAG_NAME)
+#define silk_TimerSave(FILE_NAME)
+
+#endif /* SILK_TIC_TOC */
+
+
+#if SILK_DEBUG
+/************************************/
+/* write data to file for debugging */
+/************************************/
+/* Example: DEBUG_STORE_DATA(testfile.pcm, &RIN[0], 160*sizeof(opus_int16)); */
+
+#define silk_NUM_STORES_MAX                                  100
+extern FILE *silk_debug_store_fp[ silk_NUM_STORES_MAX ];
+extern int silk_debug_store_count;
+
+/* Faster way of storing the data */
+#define DEBUG_STORE_DATA( FILE_NAME, DATA_PTR, N_BYTES ) {          \
+    static opus_int init = 0, cnt = 0;                              \
+    static FILE **fp;                                               \
+    if (init == 0) {                                                \
+        init = 1;                                                   \
+        cnt = silk_debug_store_count++;                             \
+        silk_debug_store_fp[ cnt ] = fopen(#FILE_NAME, "wb");       \
+    }                                                               \
+    fwrite((DATA_PTR), (N_BYTES), 1, silk_debug_store_fp[ cnt ]);   \
+}
+
+/* Call this at the end of main() */
+#define SILK_DEBUG_STORE_CLOSE_FILES {                              \
+    opus_int i;                                                     \
+    for( i = 0; i < silk_debug_store_count; i++ ) {                 \
+        fclose( silk_debug_store_fp[ i ] );                         \
+    }                                                               \
+}
+
+#else /* SILK_DEBUG */
+
+/* define macros as empty strings */
+#define DEBUG_STORE_DATA(FILE_NAME, DATA_PTR, N_BYTES)
+#define SILK_DEBUG_STORE_CLOSE_FILES
+
+#endif /* SILK_DEBUG */
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* SILK_DEBUG_H */
diff --git a/drivers/opus/silk/dec_API.c b/drivers/opus/silk/dec_API.c
new file mode 100644
index 0000000000..cd72115a20
--- /dev/null
+++ b/drivers/opus/silk/dec_API.c
@@ -0,0 +1,397 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+#include "API.h"
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+/************************/
+/* Decoder Super Struct */
+/************************/
+typedef struct {
+    silk_decoder_state          channel_state[ DECODER_NUM_CHANNELS ];
+    stereo_dec_state                sStereo;
+    opus_int                         nChannelsAPI;
+    opus_int                         nChannelsInternal;
+    opus_int                         prev_decode_only_middle;
+} silk_decoder;
+
+/*********************/
+/* Decoder functions */
+/*********************/
+
+opus_int silk_Get_Decoder_Size(                         /* O    Returns error code                              */
+    opus_int                        *decSizeBytes       /* O    Number of bytes in SILK decoder state           */
+)
+{
+    opus_int ret = SILK_NO_ERROR;
+
+    *decSizeBytes = sizeof( silk_decoder );
+
+    return ret;
+}
+
+/* Reset decoder state */
+opus_int silk_InitDecoder(                              /* O    Returns error code                              */
+    void                            *decState           /* I/O  State                                           */
+)
+{
+    opus_int n, ret = SILK_NO_ERROR;
+    silk_decoder_state *channel_state = ((silk_decoder *)decState)->channel_state;
+
+    for( n = 0; n < DECODER_NUM_CHANNELS; n++ ) {
+        ret  = silk_init_decoder( &channel_state[ n ] );
+    }
+    silk_memset(&((silk_decoder *)decState)->sStereo, 0, sizeof(((silk_decoder *)decState)->sStereo));
+    /* Not strictly needed, but it's cleaner that way */
+    ((silk_decoder *)decState)->prev_decode_only_middle = 0;
+
+    return ret;
+}
+
+/* Decode a frame */
+opus_int silk_Decode(                                   /* O    Returns error code                              */
+    void*                           decState,           /* I/O  State                                           */
+    silk_DecControlStruct*          decControl,         /* I/O  Control Structure                               */
+    opus_int                        lostFlag,           /* I    0: no loss, 1 loss, 2 decode fec                */
+    opus_int                        newPacketFlag,      /* I    Indicates first decoder call for this packet    */
+    ec_dec                          *psRangeDec,        /* I/O  Compressor data structure                       */
+    opus_int16                      *samplesOut,        /* O    Decoded output speech vector                    */
+    opus_int32                      *nSamplesOut        /* O    Number of samples decoded                       */
+)
+{
+    opus_int   i, n, decode_only_middle = 0, ret = SILK_NO_ERROR;
+    opus_int32 nSamplesOutDec, LBRR_symbol;
+    opus_int16 *samplesOut1_tmp[ 2 ];
+    VARDECL( opus_int16, samplesOut1_tmp_storage );
+    VARDECL( opus_int16, samplesOut2_tmp );
+    opus_int32 MS_pred_Q13[ 2 ] = { 0 };
+    opus_int16 *resample_out_ptr;
+    silk_decoder *psDec = ( silk_decoder * )decState;
+    silk_decoder_state *channel_state = psDec->channel_state;
+    opus_int has_side;
+    opus_int stereo_to_mono;
+    SAVE_STACK;
+
+    silk_assert( decControl->nChannelsInternal == 1 || decControl->nChannelsInternal == 2 );
+
+    /**********************************/
+    /* Test if first frame in payload */
+    /**********************************/
+    if( newPacketFlag ) {
+        for( n = 0; n < decControl->nChannelsInternal; n++ ) {
+            channel_state[ n ].nFramesDecoded = 0;  /* Used to count frames in packet */
+        }
+    }
+
+    /* If Mono -> Stereo transition in bitstream: init state of second channel */
+    if( decControl->nChannelsInternal > psDec->nChannelsInternal ) {
+        ret += silk_init_decoder( &channel_state[ 1 ] );
+    }
+
+    stereo_to_mono = decControl->nChannelsInternal == 1 && psDec->nChannelsInternal == 2 &&
+                     ( decControl->internalSampleRate == 1000*channel_state[ 0 ].fs_kHz );
+
+    if( channel_state[ 0 ].nFramesDecoded == 0 ) {
+        for( n = 0; n < decControl->nChannelsInternal; n++ ) {
+            opus_int fs_kHz_dec;
+            if( decControl->payloadSize_ms == 0 ) {
+                /* Assuming packet loss, use 10 ms */
+                channel_state[ n ].nFramesPerPacket = 1;
+                channel_state[ n ].nb_subfr = 2;
+            } else if( decControl->payloadSize_ms == 10 ) {
+                channel_state[ n ].nFramesPerPacket = 1;
+                channel_state[ n ].nb_subfr = 2;
+            } else if( decControl->payloadSize_ms == 20 ) {
+                channel_state[ n ].nFramesPerPacket = 1;
+                channel_state[ n ].nb_subfr = 4;
+            } else if( decControl->payloadSize_ms == 40 ) {
+                channel_state[ n ].nFramesPerPacket = 2;
+                channel_state[ n ].nb_subfr = 4;
+            } else if( decControl->payloadSize_ms == 60 ) {
+                channel_state[ n ].nFramesPerPacket = 3;
+                channel_state[ n ].nb_subfr = 4;
+            } else {
+                silk_assert( 0 );
+                RESTORE_STACK;
+                return SILK_DEC_INVALID_FRAME_SIZE;
+            }
+            fs_kHz_dec = ( decControl->internalSampleRate >> 10 ) + 1;
+            if( fs_kHz_dec != 8 && fs_kHz_dec != 12 && fs_kHz_dec != 16 ) {
+                silk_assert( 0 );
+                RESTORE_STACK;
+                return SILK_DEC_INVALID_SAMPLING_FREQUENCY;
+            }
+            ret += silk_decoder_set_fs( &channel_state[ n ], fs_kHz_dec, decControl->API_sampleRate );
+        }
+    }
+
+    if( decControl->nChannelsAPI == 2 && decControl->nChannelsInternal == 2 && ( psDec->nChannelsAPI == 1 || psDec->nChannelsInternal == 1 ) ) {
+        silk_memset( psDec->sStereo.pred_prev_Q13, 0, sizeof( psDec->sStereo.pred_prev_Q13 ) );
+        silk_memset( psDec->sStereo.sSide, 0, sizeof( psDec->sStereo.sSide ) );
+        silk_memcpy( &channel_state[ 1 ].resampler_state, &channel_state[ 0 ].resampler_state, sizeof( silk_resampler_state_struct ) );
+    }
+    psDec->nChannelsAPI      = decControl->nChannelsAPI;
+    psDec->nChannelsInternal = decControl->nChannelsInternal;
+
+    if( decControl->API_sampleRate > (opus_int32)MAX_API_FS_KHZ * 1000 || decControl->API_sampleRate < 8000 ) {
+        ret = SILK_DEC_INVALID_SAMPLING_FREQUENCY;
+        RESTORE_STACK;
+        return( ret );
+    }
+
+    if( lostFlag != FLAG_PACKET_LOST && channel_state[ 0 ].nFramesDecoded == 0 ) {
+        /* First decoder call for this payload */
+        /* Decode VAD flags and LBRR flag */
+        for( n = 0; n < decControl->nChannelsInternal; n++ ) {
+            for( i = 0; i < channel_state[ n ].nFramesPerPacket; i++ ) {
+                channel_state[ n ].VAD_flags[ i ] = ec_dec_bit_logp(psRangeDec, 1);
+            }
+            channel_state[ n ].LBRR_flag = ec_dec_bit_logp(psRangeDec, 1);
+        }
+        /* Decode LBRR flags */
+        for( n = 0; n < decControl->nChannelsInternal; n++ ) {
+            silk_memset( channel_state[ n ].LBRR_flags, 0, sizeof( channel_state[ n ].LBRR_flags ) );
+            if( channel_state[ n ].LBRR_flag ) {
+                if( channel_state[ n ].nFramesPerPacket == 1 ) {
+                    channel_state[ n ].LBRR_flags[ 0 ] = 1;
+                } else {
+                    LBRR_symbol = ec_dec_icdf( psRangeDec, silk_LBRR_flags_iCDF_ptr[ channel_state[ n ].nFramesPerPacket - 2 ], 8 ) + 1;
+                    for( i = 0; i < channel_state[ n ].nFramesPerPacket; i++ ) {
+                        channel_state[ n ].LBRR_flags[ i ] = silk_RSHIFT( LBRR_symbol, i ) & 1;
+                    }
+                }
+            }
+        }
+
+        if( lostFlag == FLAG_DECODE_NORMAL ) {
+            /* Regular decoding: skip all LBRR data */
+            for( i = 0; i < channel_state[ 0 ].nFramesPerPacket; i++ ) {
+                for( n = 0; n < decControl->nChannelsInternal; n++ ) {
+                    if( channel_state[ n ].LBRR_flags[ i ] ) {
+                        opus_int pulses[ MAX_FRAME_LENGTH ];
+                        opus_int condCoding;
+
+                        if( decControl->nChannelsInternal == 2 && n == 0 ) {
+                            silk_stereo_decode_pred( psRangeDec, MS_pred_Q13 );
+                            if( channel_state[ 1 ].LBRR_flags[ i ] == 0 ) {
+                                silk_stereo_decode_mid_only( psRangeDec, &decode_only_middle );
+                            }
+                        }
+                        /* Use conditional coding if previous frame available */
+                        if( i > 0 && channel_state[ n ].LBRR_flags[ i - 1 ] ) {
+                            condCoding = CODE_CONDITIONALLY;
+                        } else {
+                            condCoding = CODE_INDEPENDENTLY;
+                        }
+                        silk_decode_indices( &channel_state[ n ], psRangeDec, i, 1, condCoding );
+                        silk_decode_pulses( psRangeDec, pulses, channel_state[ n ].indices.signalType,
+                            channel_state[ n ].indices.quantOffsetType, channel_state[ n ].frame_length );
+                    }
+                }
+            }
+        }
+    }
+
+    /* Get MS predictor index */
+    if( decControl->nChannelsInternal == 2 ) {
+        if(   lostFlag == FLAG_DECODE_NORMAL ||
+            ( lostFlag == FLAG_DECODE_LBRR && channel_state[ 0 ].LBRR_flags[ channel_state[ 0 ].nFramesDecoded ] == 1 ) )
+        {
+            silk_stereo_decode_pred( psRangeDec, MS_pred_Q13 );
+            /* For LBRR data, decode mid-only flag only if side-channel's LBRR flag is false */
+            if( ( lostFlag == FLAG_DECODE_NORMAL && channel_state[ 1 ].VAD_flags[ channel_state[ 0 ].nFramesDecoded ] == 0 ) ||
+                ( lostFlag == FLAG_DECODE_LBRR && channel_state[ 1 ].LBRR_flags[ channel_state[ 0 ].nFramesDecoded ] == 0 ) )
+            {
+                silk_stereo_decode_mid_only( psRangeDec, &decode_only_middle );
+            } else {
+                decode_only_middle = 0;
+            }
+        } else {
+            for( n = 0; n < 2; n++ ) {
+                MS_pred_Q13[ n ] = psDec->sStereo.pred_prev_Q13[ n ];
+            }
+        }
+    }
+
+    /* Reset side channel decoder prediction memory for first frame with side coding */
+    if( decControl->nChannelsInternal == 2 && decode_only_middle == 0 && psDec->prev_decode_only_middle == 1 ) {
+        silk_memset( psDec->channel_state[ 1 ].outBuf, 0, sizeof(psDec->channel_state[ 1 ].outBuf) );
+        silk_memset( psDec->channel_state[ 1 ].sLPC_Q14_buf, 0, sizeof(psDec->channel_state[ 1 ].sLPC_Q14_buf) );
+        psDec->channel_state[ 1 ].lagPrev        = 100;
+        psDec->channel_state[ 1 ].LastGainIndex  = 10;
+        psDec->channel_state[ 1 ].prevSignalType = TYPE_NO_VOICE_ACTIVITY;
+        psDec->channel_state[ 1 ].first_frame_after_reset = 1;
+    }
+
+    ALLOC( samplesOut1_tmp_storage,
+           decControl->nChannelsInternal*(
+               channel_state[ 0 ].frame_length + 2 ),
+           opus_int16 );
+    samplesOut1_tmp[ 0 ] = samplesOut1_tmp_storage;
+    samplesOut1_tmp[ 1 ] = samplesOut1_tmp_storage
+                           + channel_state[ 0 ].frame_length + 2;
+
+    if( lostFlag == FLAG_DECODE_NORMAL ) {
+        has_side = !decode_only_middle;
+    } else {
+        has_side = !psDec->prev_decode_only_middle
+              || (decControl->nChannelsInternal == 2 && lostFlag == FLAG_DECODE_LBRR && channel_state[1].LBRR_flags[ channel_state[1].nFramesDecoded ] == 1 );
+    }
+    /* Call decoder for one frame */
+    for( n = 0; n < decControl->nChannelsInternal; n++ ) {
+        if( n == 0 || has_side ) {
+            opus_int FrameIndex;
+            opus_int condCoding;
+
+            FrameIndex = channel_state[ 0 ].nFramesDecoded - n;
+            /* Use independent coding if no previous frame available */
+            if( FrameIndex <= 0 ) {
+                condCoding = CODE_INDEPENDENTLY;
+            } else if( lostFlag == FLAG_DECODE_LBRR ) {
+                condCoding = channel_state[ n ].LBRR_flags[ FrameIndex - 1 ] ? CODE_CONDITIONALLY : CODE_INDEPENDENTLY;
+            } else if( n > 0 && psDec->prev_decode_only_middle ) {
+                /* If we skipped a side frame in this packet, we don't
+                   need LTP scaling; the LTP state is well-defined. */
+                condCoding = CODE_INDEPENDENTLY_NO_LTP_SCALING;
+            } else {
+                condCoding = CODE_CONDITIONALLY;
+            }
+            ret += silk_decode_frame( &channel_state[ n ], psRangeDec, &samplesOut1_tmp[ n ][ 2 ], &nSamplesOutDec, lostFlag, condCoding);
+        } else {
+            silk_memset( &samplesOut1_tmp[ n ][ 2 ], 0, nSamplesOutDec * sizeof( opus_int16 ) );
+        }
+        channel_state[ n ].nFramesDecoded++;
+    }
+
+    if( decControl->nChannelsAPI == 2 && decControl->nChannelsInternal == 2 ) {
+        /* Convert Mid/Side to Left/Right */
+        silk_stereo_MS_to_LR( &psDec->sStereo, samplesOut1_tmp[ 0 ], samplesOut1_tmp[ 1 ], MS_pred_Q13, channel_state[ 0 ].fs_kHz, nSamplesOutDec );
+    } else {
+        /* Buffering */
+        silk_memcpy( samplesOut1_tmp[ 0 ], psDec->sStereo.sMid, 2 * sizeof( opus_int16 ) );
+        silk_memcpy( psDec->sStereo.sMid, &samplesOut1_tmp[ 0 ][ nSamplesOutDec ], 2 * sizeof( opus_int16 ) );
+    }
+
+    /* Number of output samples */
+    *nSamplesOut = silk_DIV32( nSamplesOutDec * decControl->API_sampleRate, silk_SMULBB( channel_state[ 0 ].fs_kHz, 1000 ) );
+
+    /* Set up pointers to temp buffers */
+    ALLOC( samplesOut2_tmp,
+           decControl->nChannelsAPI == 2 ? *nSamplesOut : ALLOC_NONE, opus_int16 );
+    if( decControl->nChannelsAPI == 2 ) {
+        resample_out_ptr = samplesOut2_tmp;
+    } else {
+        resample_out_ptr = samplesOut;
+    }
+
+    for( n = 0; n < silk_min( decControl->nChannelsAPI, decControl->nChannelsInternal ); n++ ) {
+
+        /* Resample decoded signal to API_sampleRate */
+        ret += silk_resampler( &channel_state[ n ].resampler_state, resample_out_ptr, &samplesOut1_tmp[ n ][ 1 ], nSamplesOutDec );
+
+        /* Interleave if stereo output and stereo stream */
+        if( decControl->nChannelsAPI == 2 ) {
+            for( i = 0; i < *nSamplesOut; i++ ) {
+                samplesOut[ n + 2 * i ] = resample_out_ptr[ i ];
+            }
+        }
+    }
+
+    /* Create two channel output from mono stream */
+    if( decControl->nChannelsAPI == 2 && decControl->nChannelsInternal == 1 ) {
+        if ( stereo_to_mono ){
+            /* Resample right channel for newly collapsed stereo just in case
+               we weren't doing collapsing when switching to mono */
+            ret += silk_resampler( &channel_state[ 1 ].resampler_state, resample_out_ptr, &samplesOut1_tmp[ 0 ][ 1 ], nSamplesOutDec );
+
+            for( i = 0; i < *nSamplesOut; i++ ) {
+                samplesOut[ 1 + 2 * i ] = resample_out_ptr[ i ];
+            }
+        } else {
+            for( i = 0; i < *nSamplesOut; i++ ) {
+                samplesOut[ 1 + 2 * i ] = samplesOut[ 0 + 2 * i ];
+            }
+        }
+    }
+
+    /* Export pitch lag, measured at 48 kHz sampling rate */
+    if( channel_state[ 0 ].prevSignalType == TYPE_VOICED ) {
+        int mult_tab[ 3 ] = { 6, 4, 3 };
+        decControl->prevPitchLag = channel_state[ 0 ].lagPrev * mult_tab[ ( channel_state[ 0 ].fs_kHz - 8 ) >> 2 ];
+    } else {
+        decControl->prevPitchLag = 0;
+    }
+
+    if( lostFlag == FLAG_PACKET_LOST ) {
+       /* On packet loss, remove the gain clamping to prevent having the energy "bounce back"
+          if we lose packets when the energy is going down */
+       for ( i = 0; i < psDec->nChannelsInternal; i++ )
+          psDec->channel_state[ i ].LastGainIndex = 10;
+    } else {
+       psDec->prev_decode_only_middle = decode_only_middle;
+    }
+    RESTORE_STACK;
+    return ret;
+}
+
+#if 0
+/* Getting table of contents for a packet */
+opus_int silk_get_TOC(
+    const opus_uint8                *payload,           /* I    Payload data                                */
+    const opus_int                  nBytesIn,           /* I    Number of input bytes                       */
+    const opus_int                  nFramesPerPayload,  /* I    Number of SILK frames per payload           */
+    silk_TOC_struct                 *Silk_TOC           /* O    Type of content                             */
+)
+{
+    opus_int i, flags, ret = SILK_NO_ERROR;
+
+    if( nBytesIn < 1 ) {
+        return -1;
+    }
+    if( nFramesPerPayload < 0 || nFramesPerPayload > 3 ) {
+        return -1;
+    }
+
+    silk_memset( Silk_TOC, 0, sizeof( *Silk_TOC ) );
+
+    /* For stereo, extract the flags for the mid channel */
+    flags = silk_RSHIFT( payload[ 0 ], 7 - nFramesPerPayload ) & ( silk_LSHIFT( 1, nFramesPerPayload + 1 ) - 1 );
+
+    Silk_TOC->inbandFECFlag = flags & 1;
+    for( i = nFramesPerPayload - 1; i >= 0 ; i-- ) {
+        flags = silk_RSHIFT( flags, 1 );
+        Silk_TOC->VADFlags[ i ] = flags & 1;
+        Silk_TOC->VADFlag |= flags & 1;
+    }
+
+    return ret;
+}
+#endif
diff --git a/drivers/opus/silk/decode_core.c b/drivers/opus/silk/decode_core.c
new file mode 100644
index 0000000000..8f801ea7ad
--- /dev/null
+++ b/drivers/opus/silk/decode_core.c
@@ -0,0 +1,238 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+/**********************************************************/
+/* Core decoder. Performs inverse NSQ operation LTP + LPC */
+/**********************************************************/
+void silk_decode_core(
+    silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
+    silk_decoder_control        *psDecCtrl,                     /* I    Decoder control                             */
+    opus_int16                  xq[],                           /* O    Decoded speech                              */
+    const opus_int              pulses[ MAX_FRAME_LENGTH ]      /* I    Pulse signal                                */
+)
+{
+    opus_int   i, k, lag = 0, start_idx, sLTP_buf_idx, NLSF_interpolation_flag, signalType;
+    opus_int16 *A_Q12, *B_Q14, *pxq, A_Q12_tmp[ MAX_LPC_ORDER ];
+    VARDECL( opus_int16, sLTP );
+    VARDECL( opus_int32, sLTP_Q15 );
+    opus_int32 LTP_pred_Q13, LPC_pred_Q10, Gain_Q10, inv_gain_Q31, gain_adj_Q16, rand_seed, offset_Q10;
+    opus_int32 *pred_lag_ptr, *pexc_Q14, *pres_Q14;
+    VARDECL( opus_int32, res_Q14 );
+    VARDECL( opus_int32, sLPC_Q14 );
+    SAVE_STACK;
+
+    silk_assert( psDec->prev_gain_Q16 != 0 );
+
+    ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 );
+    ALLOC( sLTP_Q15, psDec->ltp_mem_length + psDec->frame_length, opus_int32 );
+    ALLOC( res_Q14, psDec->subfr_length, opus_int32 );
+    ALLOC( sLPC_Q14, psDec->subfr_length + MAX_LPC_ORDER, opus_int32 );
+
+    offset_Q10 = silk_Quantization_Offsets_Q10[ psDec->indices.signalType >> 1 ][ psDec->indices.quantOffsetType ];
+
+    if( psDec->indices.NLSFInterpCoef_Q2 < 1 << 2 ) {
+        NLSF_interpolation_flag = 1;
+    } else {
+        NLSF_interpolation_flag = 0;
+    }
+
+    /* Decode excitation */
+    rand_seed = psDec->indices.Seed;
+    for( i = 0; i < psDec->frame_length; i++ ) {
+        rand_seed = silk_RAND( rand_seed );
+        psDec->exc_Q14[ i ] = silk_LSHIFT( (opus_int32)pulses[ i ], 14 );
+        if( psDec->exc_Q14[ i ] > 0 ) {
+            psDec->exc_Q14[ i ] -= QUANT_LEVEL_ADJUST_Q10 << 4;
+        } else
+        if( psDec->exc_Q14[ i ] < 0 ) {
+            psDec->exc_Q14[ i ] += QUANT_LEVEL_ADJUST_Q10 << 4;
+        }
+        psDec->exc_Q14[ i ] += offset_Q10 << 4;
+        if( rand_seed < 0 ) {
+           psDec->exc_Q14[ i ] = -psDec->exc_Q14[ i ];
+        }
+
+        rand_seed = silk_ADD32_ovflw( rand_seed, pulses[ i ] );
+    }
+
+    /* Copy LPC state */
+    silk_memcpy( sLPC_Q14, psDec->sLPC_Q14_buf, MAX_LPC_ORDER * sizeof( opus_int32 ) );
+
+    pexc_Q14 = psDec->exc_Q14;
+    pxq      = xq;
+    sLTP_buf_idx = psDec->ltp_mem_length;
+    /* Loop over subframes */
+    for( k = 0; k < psDec->nb_subfr; k++ ) {
+        pres_Q14 = res_Q14;
+        A_Q12 = psDecCtrl->PredCoef_Q12[ k >> 1 ];
+
+        /* Preload LPC coeficients to array on stack. Gives small performance gain */
+        silk_memcpy( A_Q12_tmp, A_Q12, psDec->LPC_order * sizeof( opus_int16 ) );
+        B_Q14        = &psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER ];
+        signalType   = psDec->indices.signalType;
+
+        Gain_Q10     = silk_RSHIFT( psDecCtrl->Gains_Q16[ k ], 6 );
+        inv_gain_Q31 = silk_INVERSE32_varQ( psDecCtrl->Gains_Q16[ k ], 47 );
+
+        /* Calculate gain adjustment factor */
+        if( psDecCtrl->Gains_Q16[ k ] != psDec->prev_gain_Q16 ) {
+            gain_adj_Q16 =  silk_DIV32_varQ( psDec->prev_gain_Q16, psDecCtrl->Gains_Q16[ k ], 16 );
+
+            /* Scale short term state */
+            for( i = 0; i < MAX_LPC_ORDER; i++ ) {
+                sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, sLPC_Q14[ i ] );
+            }
+        } else {
+            gain_adj_Q16 = (opus_int32)1 << 16;
+        }
+
+        /* Save inv_gain */
+        silk_assert( inv_gain_Q31 != 0 );
+        psDec->prev_gain_Q16 = psDecCtrl->Gains_Q16[ k ];
+
+        /* Avoid abrupt transition from voiced PLC to unvoiced normal decoding */
+        if( psDec->lossCnt && psDec->prevSignalType == TYPE_VOICED &&
+            psDec->indices.signalType != TYPE_VOICED && k < MAX_NB_SUBFR/2 ) {
+
+            silk_memset( B_Q14, 0, LTP_ORDER * sizeof( opus_int16 ) );
+            B_Q14[ LTP_ORDER/2 ] = SILK_FIX_CONST( 0.25, 14 );
+
+            signalType = TYPE_VOICED;
+            psDecCtrl->pitchL[ k ] = psDec->lagPrev;
+        }
+
+        if( signalType == TYPE_VOICED ) {
+            /* Voiced */
+            lag = psDecCtrl->pitchL[ k ];
+
+            /* Re-whitening */
+            if( k == 0 || ( k == 2 && NLSF_interpolation_flag ) ) {
+                /* Rewhiten with new A coefs */
+                start_idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2;
+                silk_assert( start_idx > 0 );
+
+                if( k == 2 ) {
+                    silk_memcpy( &psDec->outBuf[ psDec->ltp_mem_length ], xq, 2 * psDec->subfr_length * sizeof( opus_int16 ) );
+                }
+
+                silk_LPC_analysis_filter( &sLTP[ start_idx ], &psDec->outBuf[ start_idx + k * psDec->subfr_length ],
+                    A_Q12, psDec->ltp_mem_length - start_idx, psDec->LPC_order );
+
+                /* After rewhitening the LTP state is unscaled */
+                if( k == 0 ) {
+                    /* Do LTP downscaling to reduce inter-packet dependency */
+                    inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, psDecCtrl->LTP_scale_Q14 ), 2 );
+                }
+                for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
+                    sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWB( inv_gain_Q31, sLTP[ psDec->ltp_mem_length - i - 1 ] );
+                }
+            } else {
+                /* Update LTP state when Gain changes */
+                if( gain_adj_Q16 != (opus_int32)1 << 16 ) {
+                    for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
+                        sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ sLTP_buf_idx - i - 1 ] );
+                    }
+                }
+            }
+        }
+
+        /* Long-term prediction */
+        if( signalType == TYPE_VOICED ) {
+            /* Set up pointer */
+            pred_lag_ptr = &sLTP_Q15[ sLTP_buf_idx - lag + LTP_ORDER / 2 ];
+            for( i = 0; i < psDec->subfr_length; i++ ) {
+                /* Unrolled loop */
+                /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+                LTP_pred_Q13 = 2;
+                LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[  0 ], B_Q14[ 0 ] );
+                LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -1 ], B_Q14[ 1 ] );
+                LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -2 ], B_Q14[ 2 ] );
+                LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -3 ], B_Q14[ 3 ] );
+                LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -4 ], B_Q14[ 4 ] );
+                pred_lag_ptr++;
+
+                /* Generate LPC excitation */
+                pres_Q14[ i ] = silk_ADD_LSHIFT32( pexc_Q14[ i ], LTP_pred_Q13, 1 );
+
+                /* Update states */
+                sLTP_Q15[ sLTP_buf_idx ] = silk_LSHIFT( pres_Q14[ i ], 1 );
+                sLTP_buf_idx++;
+            }
+        } else {
+            pres_Q14 = pexc_Q14;
+        }
+
+        for( i = 0; i < psDec->subfr_length; i++ ) {
+            /* Short-term prediction */
+            silk_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 );
+            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
+            LPC_pred_Q10 = silk_RSHIFT( psDec->LPC_order, 1 );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  1 ], A_Q12_tmp[ 0 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  2 ], A_Q12_tmp[ 1 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  3 ], A_Q12_tmp[ 2 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  4 ], A_Q12_tmp[ 3 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  5 ], A_Q12_tmp[ 4 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  6 ], A_Q12_tmp[ 5 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  7 ], A_Q12_tmp[ 6 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  8 ], A_Q12_tmp[ 7 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  9 ], A_Q12_tmp[ 8 ] );
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 10 ], A_Q12_tmp[ 9 ] );
+            if( psDec->LPC_order == 16 ) {
+                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 11 ], A_Q12_tmp[ 10 ] );
+                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 12 ], A_Q12_tmp[ 11 ] );
+                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 13 ], A_Q12_tmp[ 12 ] );
+                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 14 ], A_Q12_tmp[ 13 ] );
+                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 15 ], A_Q12_tmp[ 14 ] );
+                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 16 ], A_Q12_tmp[ 15 ] );
+            }
+
+            /* Add prediction to LPC excitation */
+            sLPC_Q14[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT32( pres_Q14[ i ], LPC_pred_Q10, 4 );
+
+            /* Scale with gain */
+            pxq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14[ MAX_LPC_ORDER + i ], Gain_Q10 ), 8 ) );
+        }
+
+        /* DEBUG_STORE_DATA( dec.pcm, pxq, psDec->subfr_length * sizeof( opus_int16 ) ) */
+
+        /* Update LPC filter state */
+        silk_memcpy( sLPC_Q14, &sLPC_Q14[ psDec->subfr_length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
+        pexc_Q14 += psDec->subfr_length;
+        pxq      += psDec->subfr_length;
+    }
+
+    /* Save LPC state */
+    silk_memcpy( psDec->sLPC_Q14_buf, sLPC_Q14, MAX_LPC_ORDER * sizeof( opus_int32 ) );
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/decode_frame.c b/drivers/opus/silk/decode_frame.c
new file mode 100644
index 0000000000..38500227c2
--- /dev/null
+++ b/drivers/opus/silk/decode_frame.c
@@ -0,0 +1,128 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+#include "PLC.h"
+
+/****************/
+/* Decode frame */
+/****************/
+opus_int silk_decode_frame(
+    silk_decoder_state          *psDec,                         /* I/O  Pointer to Silk decoder state               */
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int16                  pOut[],                         /* O    Pointer to output speech frame              */
+    opus_int32                  *pN,                            /* O    Pointer to size of output frame             */
+    opus_int                    lostFlag,                       /* I    0: no loss, 1 loss, 2 decode fec            */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+)
+{
+    VARDECL( silk_decoder_control, psDecCtrl );
+    opus_int         L, mv_len, ret = 0;
+    VARDECL( opus_int, pulses );
+    SAVE_STACK;
+
+    L = psDec->frame_length;
+    ALLOC( psDecCtrl, 1, silk_decoder_control );
+    ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) &
+                   ~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int );
+    psDecCtrl->LTP_scale_Q14 = 0;
+
+    /* Safety checks */
+    silk_assert( L > 0 && L <= MAX_FRAME_LENGTH );
+
+    if(   lostFlag == FLAG_DECODE_NORMAL ||
+        ( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) )
+    {
+        /*********************************************/
+        /* Decode quantization indices of side info  */
+        /*********************************************/
+        silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag, condCoding );
+
+        /*********************************************/
+        /* Decode quantization indices of excitation */
+        /*********************************************/
+        silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType,
+                psDec->indices.quantOffsetType, psDec->frame_length );
+
+        /********************************************/
+        /* Decode parameters and pulse signal       */
+        /********************************************/
+        silk_decode_parameters( psDec, psDecCtrl, condCoding );
+
+        /********************************************************/
+        /* Run inverse NSQ                                      */
+        /********************************************************/
+        silk_decode_core( psDec, psDecCtrl, pOut, pulses );
+
+        /********************************************************/
+        /* Update PLC state                                     */
+        /********************************************************/
+        silk_PLC( psDec, psDecCtrl, pOut, 0 );
+
+        psDec->lossCnt = 0;
+        psDec->prevSignalType = psDec->indices.signalType;
+        silk_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 );
+
+        /* A frame has been decoded without errors */
+        psDec->first_frame_after_reset = 0;
+    } else {
+        /* Handle packet loss by extrapolation */
+        silk_PLC( psDec, psDecCtrl, pOut, 1 );
+    }
+
+    /*************************/
+    /* Update output buffer. */
+    /*************************/
+    silk_assert( psDec->ltp_mem_length >= psDec->frame_length );
+    mv_len = psDec->ltp_mem_length - psDec->frame_length;
+    silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) );
+    silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) );
+
+    /****************************************************************/
+    /* Ensure smooth connection of extrapolated and good frames     */
+    /****************************************************************/
+    silk_PLC_glue_frames( psDec, pOut, L );
+
+    /************************************************/
+    /* Comfort noise generation / estimation        */
+    /************************************************/
+    silk_CNG( psDec, psDecCtrl, pOut, L );
+
+    /* Update some decoder state variables */
+    psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ];
+
+    /* Set output frame length */
+    *pN = L;
+
+    RESTORE_STACK;
+    return ret;
+}
diff --git a/drivers/opus/silk/decode_indices.c b/drivers/opus/silk/decode_indices.c
new file mode 100644
index 0000000000..c2aaad2606
--- /dev/null
+++ b/drivers/opus/silk/decode_indices.c
@@ -0,0 +1,151 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Decode side-information parameters from payload */
+void silk_decode_indices(
+    silk_decoder_state          *psDec,                         /* I/O  State                                       */
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    FrameIndex,                     /* I    Frame number                                */
+    opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+)
+{
+    opus_int   i, k, Ix;
+    opus_int   decode_absolute_lagIndex, delta_lagIndex;
+    opus_int16 ec_ix[ MAX_LPC_ORDER ];
+    opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
+
+    /*******************************************/
+    /* Decode signal type and quantizer offset */
+    /*******************************************/
+    if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
+        Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
+    } else {
+        Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
+    }
+    psDec->indices.signalType      = (opus_int8)silk_RSHIFT( Ix, 1 );
+    psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
+
+    /****************/
+    /* Decode gains */
+    /****************/
+    /* First subframe */
+    if( condCoding == CODE_CONDITIONALLY ) {
+        /* Conditional coding */
+        psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
+    } else {
+        /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
+        psDec->indices.GainsIndices[ 0 ]  = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
+        psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
+    }
+
+    /* Remaining subframes */
+    for( i = 1; i < psDec->nb_subfr; i++ ) {
+        psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
+    }
+
+    /**********************/
+    /* Decode LSF Indices */
+    /**********************/
+    psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
+    silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
+    silk_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
+    for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
+        Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
+        if( Ix == 0 ) {
+            Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
+        } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
+            Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
+        }
+        psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
+    }
+
+    /* Decode LSF interpolation factor */
+    if( psDec->nb_subfr == MAX_NB_SUBFR ) {
+        psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
+    } else {
+        psDec->indices.NLSFInterpCoef_Q2 = 4;
+    }
+
+    if( psDec->indices.signalType == TYPE_VOICED )
+    {
+        /*********************/
+        /* Decode pitch lags */
+        /*********************/
+        /* Get lag index */
+        decode_absolute_lagIndex = 1;
+        if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
+            /* Decode Delta index */
+            delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
+            if( delta_lagIndex > 0 ) {
+                delta_lagIndex = delta_lagIndex - 9;
+                psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
+                decode_absolute_lagIndex = 0;
+            }
+        }
+        if( decode_absolute_lagIndex ) {
+            /* Absolute decoding */
+            psDec->indices.lagIndex  = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
+            psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
+        }
+        psDec->ec_prevLagIndex = psDec->indices.lagIndex;
+
+        /* Get countour index */
+        psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
+
+        /********************/
+        /* Decode LTP gains */
+        /********************/
+        /* Decode PERIndex value */
+        psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
+
+        for( k = 0; k < psDec->nb_subfr; k++ ) {
+            psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
+        }
+
+        /**********************/
+        /* Decode LTP scaling */
+        /**********************/
+        if( condCoding == CODE_INDEPENDENTLY ) {
+            psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
+        } else {
+            psDec->indices.LTP_scaleIndex = 0;
+        }
+    }
+    psDec->ec_prevSignalType = psDec->indices.signalType;
+
+    /***************/
+    /* Decode seed */
+    /***************/
+    psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
+}
diff --git a/drivers/opus/silk/decode_parameters.c b/drivers/opus/silk/decode_parameters.c
new file mode 100644
index 0000000000..72df4fcdb2
--- /dev/null
+++ b/drivers/opus/silk/decode_parameters.c
@@ -0,0 +1,115 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Decode parameters from payload */
+void silk_decode_parameters(
+    silk_decoder_state          *psDec,                         /* I/O  State                                       */
+    silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+)
+{
+    opus_int   i, k, Ix;
+    opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
+    const opus_int8 *cbk_ptr_Q7;
+
+    /* Dequant Gains */
+    silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices,
+        &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr );
+
+    /****************/
+    /* Decode NLSFs */
+    /****************/
+    silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB );
+
+    /* Convert NLSF parameters to AR prediction filter coefficients */
+    silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order );
+
+    /* If just reset, e.g., because internal Fs changed, do not allow interpolation */
+    /* improves the case of packet loss in the first frame after a switch           */
+    if( psDec->first_frame_after_reset == 1 ) {
+        psDec->indices.NLSFInterpCoef_Q2 = 4;
+    }
+
+    if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) {
+        /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */
+        /* the previous NLSF1, and the current NLSF1                                   */
+        for( i = 0; i < psDec->LPC_order; i++ ) {
+            pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2,
+                pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 );
+        }
+
+        /* Convert NLSF parameters to AR prediction filter coefficients */
+        silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order );
+    } else {
+        /* Copy LPC coefficients for first half from second half */
+        silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
+    }
+
+    silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) );
+
+    /* After a packet loss do BWE of LPC coefs */
+    if( psDec->lossCnt ) {
+        silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
+        silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
+    }
+
+    if( psDec->indices.signalType == TYPE_VOICED ) {
+        /*********************/
+        /* Decode pitch lags */
+        /*********************/
+
+        /* Decode pitch values */
+        silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr );
+
+        /* Decode Codebook Index */
+        cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */
+
+        for( k = 0; k < psDec->nb_subfr; k++ ) {
+            Ix = psDec->indices.LTPIndex[ k ];
+            for( i = 0; i < LTP_ORDER; i++ ) {
+                psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 );
+            }
+        }
+
+        /**********************/
+        /* Decode LTP scaling */
+        /**********************/
+        Ix = psDec->indices.LTP_scaleIndex;
+        psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ];
+    } else {
+        silk_memset( psDecCtrl->pitchL,      0,             psDec->nb_subfr * sizeof( opus_int   ) );
+        silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) );
+        psDec->indices.PERIndex  = 0;
+        psDecCtrl->LTP_scale_Q14 = 0;
+    }
+}
diff --git a/drivers/opus/silk/decode_pitch.c b/drivers/opus/silk/decode_pitch.c
new file mode 100644
index 0000000000..3e1dd2d35b
--- /dev/null
+++ b/drivers/opus/silk/decode_pitch.c
@@ -0,0 +1,77 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/***********************************************************
+* Pitch analyser function
+********************************************************** */
+#include "SigProc_FIX.h"
+#include "pitch_est_defines.h"
+
+void silk_decode_pitch(
+    opus_int16                  lagIndex,           /* I                                                                */
+    opus_int8                   contourIndex,       /* O                                                                */
+    opus_int                    pitch_lags[],       /* O    4 pitch values                                              */
+    const opus_int              Fs_kHz,             /* I    sampling frequency (kHz)                                    */
+    const opus_int              nb_subfr            /* I    number of sub frames                                        */
+)
+{
+    opus_int   lag, k, min_lag, max_lag, cbk_size;
+    const opus_int8 *Lag_CB_ptr;
+
+    if( Fs_kHz == 8 ) {
+        if( nb_subfr == PE_MAX_NB_SUBFR ) {
+            Lag_CB_ptr = &silk_CB_lags_stage2[ 0 ][ 0 ];
+            cbk_size   = PE_NB_CBKS_STAGE2_EXT;
+        } else {
+            silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1 );
+            Lag_CB_ptr = &silk_CB_lags_stage2_10_ms[ 0 ][ 0 ];
+            cbk_size   = PE_NB_CBKS_STAGE2_10MS;
+        }
+    } else {
+        if( nb_subfr == PE_MAX_NB_SUBFR ) {
+            Lag_CB_ptr = &silk_CB_lags_stage3[ 0 ][ 0 ];
+            cbk_size   = PE_NB_CBKS_STAGE3_MAX;
+        } else {
+            silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1 );
+            Lag_CB_ptr = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];
+            cbk_size   = PE_NB_CBKS_STAGE3_10MS;
+        }
+    }
+
+    min_lag = silk_SMULBB( PE_MIN_LAG_MS, Fs_kHz );
+    max_lag = silk_SMULBB( PE_MAX_LAG_MS, Fs_kHz );
+    lag = min_lag + lagIndex;
+
+    for( k = 0; k < nb_subfr; k++ ) {
+        pitch_lags[ k ] = lag + matrix_ptr( Lag_CB_ptr, k, contourIndex, cbk_size );
+        pitch_lags[ k ] = silk_LIMIT( pitch_lags[ k ], min_lag, max_lag );
+    }
+}
diff --git a/drivers/opus/silk/decode_pulses.c b/drivers/opus/silk/decode_pulses.c
new file mode 100644
index 0000000000..13772f8a57
--- /dev/null
+++ b/drivers/opus/silk/decode_pulses.c
@@ -0,0 +1,115 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/*********************************************/
+/* Decode quantization indices of excitation */
+/*********************************************/
+void silk_decode_pulses(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    pulses[],                       /* O    Excitation signal                           */
+    const opus_int              signalType,                     /* I    Sigtype                                     */
+    const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
+    const opus_int              frame_length                    /* I    Frame length                                */
+)
+{
+    opus_int   i, j, k, iter, abs_q, nLS, RateLevelIndex;
+    opus_int   sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ];
+    opus_int   *pulses_ptr;
+    const opus_uint8 *cdf_ptr;
+
+    /*********************/
+    /* Decode rate level */
+    /*********************/
+    RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
+
+    /* Calculate number of shell blocks */
+    silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
+    iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
+    if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
+        silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
+        iter++;
+    }
+
+    /***************************************************/
+    /* Sum-Weighted-Pulses Decoding                    */
+    /***************************************************/
+    cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
+    for( i = 0; i < iter; i++ ) {
+        nLshifts[ i ] = 0;
+        sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 );
+
+        /* LSB indication */
+        while( sum_pulses[ i ] == MAX_PULSES + 1 ) {
+            nLshifts[ i ]++;
+            /* When we've already got 10 LSBs, we shift the table to not allow (MAX_PULSES + 1) */
+            sum_pulses[ i ] = ec_dec_icdf( psRangeDec,
+                    silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 );
+        }
+    }
+
+    /***************************************************/
+    /* Shell decoding                                  */
+    /***************************************************/
+    for( i = 0; i < iter; i++ ) {
+        if( sum_pulses[ i ] > 0 ) {
+            silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] );
+        } else {
+            silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( opus_int ) );
+        }
+    }
+
+    /***************************************************/
+    /* LSB Decoding                                    */
+    /***************************************************/
+    for( i = 0; i < iter; i++ ) {
+        if( nLshifts[ i ] > 0 ) {
+            nLS = nLshifts[ i ];
+            pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ];
+            for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
+                abs_q = pulses_ptr[ k ];
+                for( j = 0; j < nLS; j++ ) {
+                    abs_q = silk_LSHIFT( abs_q, 1 );
+                    abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 );
+                }
+                pulses_ptr[ k ] = abs_q;
+            }
+            /* Mark the number of pulses non-zero for sign decoding. */
+            sum_pulses[ i ] |= nLS << 5;
+        }
+    }
+
+    /****************************************/
+    /* Decode and add signs to pulse signal */
+    /****************************************/
+    silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
+}
diff --git a/drivers/opus/silk/decoder_set_fs.c b/drivers/opus/silk/decoder_set_fs.c
new file mode 100644
index 0000000000..6d2de56647
--- /dev/null
+++ b/drivers/opus/silk/decoder_set_fs.c
@@ -0,0 +1,108 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Set decoder sampling rate */
+opus_int silk_decoder_set_fs(
+    silk_decoder_state          *psDec,                         /* I/O  Decoder state pointer                       */
+    opus_int                    fs_kHz,                         /* I    Sampling frequency (kHz)                    */
+    opus_int32                  fs_API_Hz                       /* I    API Sampling frequency (Hz)                 */
+)
+{
+    opus_int frame_length, ret = 0;
+
+    silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
+    silk_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );
+
+    /* New (sub)frame length */
+    psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );
+    frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );
+
+    /* Initialize resampler when switching internal or external sampling frequency */
+    if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {
+        /* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */
+        ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );
+
+        psDec->fs_API_hz = fs_API_Hz;
+    }
+
+    if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {
+        if( fs_kHz == 8 ) {
+            if( psDec->nb_subfr == MAX_NB_SUBFR ) {
+                psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
+            } else {
+                psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
+            }
+        } else {
+            if( psDec->nb_subfr == MAX_NB_SUBFR ) {
+                psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;
+            } else {
+                psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
+            }
+        }
+        if( psDec->fs_kHz != fs_kHz ) {
+            psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
+            if( fs_kHz == 8 || fs_kHz == 12 ) {
+                psDec->LPC_order = MIN_LPC_ORDER;
+                psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;
+            } else {
+                psDec->LPC_order = MAX_LPC_ORDER;
+                psDec->psNLSF_CB = &silk_NLSF_CB_WB;
+            }
+            if( fs_kHz == 16 ) {
+                psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
+            } else if( fs_kHz == 12 ) {
+                psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
+            } else if( fs_kHz == 8 ) {
+                psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
+            } else {
+                /* unsupported sampling rate */
+                silk_assert( 0 );
+            }
+            psDec->first_frame_after_reset = 1;
+            psDec->lagPrev                 = 100;
+            psDec->LastGainIndex           = 10;
+            psDec->prevSignalType          = TYPE_NO_VOICE_ACTIVITY;
+            silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));
+            silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );
+        }
+
+        psDec->fs_kHz       = fs_kHz;
+        psDec->frame_length = frame_length;
+    }
+
+    /* Check that settings are valid */
+    silk_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );
+
+    return ret;
+}
+
diff --git a/drivers/opus/silk/define.h b/drivers/opus/silk/define.h
new file mode 100644
index 0000000000..c47aca9f58
--- /dev/null
+++ b/drivers/opus/silk/define.h
@@ -0,0 +1,235 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_DEFINE_H
+#define SILK_DEFINE_H
+
+#include "errors.h"
+#include "typedef.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* Max number of encoder channels (1/2) */
+#define ENCODER_NUM_CHANNELS                    2
+/* Number of decoder channels (1/2) */
+#define DECODER_NUM_CHANNELS                    2
+
+#define MAX_FRAMES_PER_PACKET                   3
+
+/* Limits on bitrate */
+#define MIN_TARGET_RATE_BPS                     5000
+#define MAX_TARGET_RATE_BPS                     80000
+#define TARGET_RATE_TAB_SZ                      8
+
+/* LBRR thresholds */
+#define LBRR_NB_MIN_RATE_BPS                    12000
+#define LBRR_MB_MIN_RATE_BPS                    14000
+#define LBRR_WB_MIN_RATE_BPS                    16000
+
+/* DTX settings */
+#define NB_SPEECH_FRAMES_BEFORE_DTX             10      /* eq 200 ms */
+#define MAX_CONSECUTIVE_DTX                     20      /* eq 400 ms */
+
+/* Maximum sampling frequency */
+#define MAX_FS_KHZ                              16
+#define MAX_API_FS_KHZ                          48
+
+/* Signal types */
+#define TYPE_NO_VOICE_ACTIVITY                  0
+#define TYPE_UNVOICED                           1
+#define TYPE_VOICED                             2
+
+/* Conditional coding types */
+#define CODE_INDEPENDENTLY                      0
+#define CODE_INDEPENDENTLY_NO_LTP_SCALING       1
+#define CODE_CONDITIONALLY                      2
+
+/* Settings for stereo processing */
+#define STEREO_QUANT_TAB_SIZE                   16
+#define STEREO_QUANT_SUB_STEPS                  5
+#define STEREO_INTERP_LEN_MS                    8       /* must be even */
+#define STEREO_RATIO_SMOOTH_COEF                0.01    /* smoothing coef for signal norms and stereo width */
+
+/* Range of pitch lag estimates */
+#define PITCH_EST_MIN_LAG_MS                    2       /* 2 ms -> 500 Hz */
+#define PITCH_EST_MAX_LAG_MS                    18      /* 18 ms -> 56 Hz */
+
+/* Maximum number of subframes */
+#define MAX_NB_SUBFR                            4
+
+/* Number of samples per frame */
+#define LTP_MEM_LENGTH_MS                       20
+#define SUB_FRAME_LENGTH_MS                     5
+#define MAX_SUB_FRAME_LENGTH                    ( SUB_FRAME_LENGTH_MS * MAX_FS_KHZ )
+#define MAX_FRAME_LENGTH_MS                     ( SUB_FRAME_LENGTH_MS * MAX_NB_SUBFR )
+#define MAX_FRAME_LENGTH                        ( MAX_FRAME_LENGTH_MS * MAX_FS_KHZ )
+
+/* Milliseconds of lookahead for pitch analysis */
+#define LA_PITCH_MS                             2
+#define LA_PITCH_MAX                            ( LA_PITCH_MS * MAX_FS_KHZ )
+
+/* Order of LPC used in find pitch */
+#define MAX_FIND_PITCH_LPC_ORDER                16
+
+/* Length of LPC window used in find pitch */
+#define FIND_PITCH_LPC_WIN_MS                   ( 20 + (LA_PITCH_MS << 1) )
+#define FIND_PITCH_LPC_WIN_MS_2_SF              ( 10 + (LA_PITCH_MS << 1) )
+#define FIND_PITCH_LPC_WIN_MAX                  ( FIND_PITCH_LPC_WIN_MS * MAX_FS_KHZ )
+
+/* Milliseconds of lookahead for noise shape analysis */
+#define LA_SHAPE_MS                             5
+#define LA_SHAPE_MAX                            ( LA_SHAPE_MS * MAX_FS_KHZ )
+
+/* Maximum length of LPC window used in noise shape analysis */
+#define SHAPE_LPC_WIN_MAX                       ( 15 * MAX_FS_KHZ )
+
+/* dB level of lowest gain quantization level */
+#define MIN_QGAIN_DB                            2
+/* dB level of highest gain quantization level */
+#define MAX_QGAIN_DB                            88
+/* Number of gain quantization levels */
+#define N_LEVELS_QGAIN                          64
+/* Max increase in gain quantization index */
+#define MAX_DELTA_GAIN_QUANT                    36
+/* Max decrease in gain quantization index */
+#define MIN_DELTA_GAIN_QUANT                    -4
+
+/* Quantization offsets (multiples of 4) */
+#define OFFSET_VL_Q10                           32
+#define OFFSET_VH_Q10                           100
+#define OFFSET_UVL_Q10                          100
+#define OFFSET_UVH_Q10                          240
+
+#define QUANT_LEVEL_ADJUST_Q10                  80
+
+/* Maximum numbers of iterations used to stabilize an LPC vector */
+#define MAX_LPC_STABILIZE_ITERATIONS            16
+#define MAX_PREDICTION_POWER_GAIN               1e4f
+#define MAX_PREDICTION_POWER_GAIN_AFTER_RESET   1e2f
+
+#define MAX_LPC_ORDER                           16
+#define MIN_LPC_ORDER                           10
+
+/* Find Pred Coef defines */
+#define LTP_ORDER                               5
+
+/* LTP quantization settings */
+#define NB_LTP_CBKS                             3
+
+/* Flag to use harmonic noise shaping */
+#define USE_HARM_SHAPING                        1
+
+/* Max LPC order of noise shaping filters */
+#define MAX_SHAPE_LPC_ORDER                     16
+
+#define HARM_SHAPE_FIR_TAPS                     3
+
+/* Maximum number of delayed decision states */
+#define MAX_DEL_DEC_STATES                      4
+
+#define LTP_BUF_LENGTH                          512
+#define LTP_MASK                                ( LTP_BUF_LENGTH - 1 )
+
+#define DECISION_DELAY                          32
+#define DECISION_DELAY_MASK                     ( DECISION_DELAY - 1 )
+
+/* Number of subframes for excitation entropy coding */
+#define SHELL_CODEC_FRAME_LENGTH                16
+#define LOG2_SHELL_CODEC_FRAME_LENGTH           4
+#define MAX_NB_SHELL_BLOCKS                     ( MAX_FRAME_LENGTH / SHELL_CODEC_FRAME_LENGTH )
+
+/* Number of rate levels, for entropy coding of excitation */
+#define N_RATE_LEVELS                           10
+
+/* Maximum sum of pulses per shell coding frame */
+#define MAX_PULSES                              16
+
+#define MAX_MATRIX_SIZE                         MAX_LPC_ORDER /* Max of LPC Order and LTP order */
+
+#if( MAX_LPC_ORDER > DECISION_DELAY )
+# define NSQ_LPC_BUF_LENGTH                     MAX_LPC_ORDER
+#else
+# define NSQ_LPC_BUF_LENGTH                     DECISION_DELAY
+#endif
+
+/***************************/
+/* Voice activity detector */
+/***************************/
+#define VAD_N_BANDS                             4
+
+#define VAD_INTERNAL_SUBFRAMES_LOG2             2
+#define VAD_INTERNAL_SUBFRAMES                  ( 1 << VAD_INTERNAL_SUBFRAMES_LOG2 )
+
+#define VAD_NOISE_LEVEL_SMOOTH_COEF_Q16         1024    /* Must be <  4096 */
+#define VAD_NOISE_LEVELS_BIAS                   50
+
+/* Sigmoid settings */
+#define VAD_NEGATIVE_OFFSET_Q5                  128     /* sigmoid is 0 at -128 */
+#define VAD_SNR_FACTOR_Q16                      45000
+
+/* smoothing for SNR measurement */
+#define VAD_SNR_SMOOTH_COEF_Q18                 4096
+
+/* Size of the piecewise linear cosine approximation table for the LSFs */
+#define LSF_COS_TAB_SZ_FIX                      128
+
+/******************/
+/* NLSF quantizer */
+/******************/
+#define NLSF_W_Q                                2
+#define NLSF_VQ_MAX_VECTORS                     32
+#define NLSF_VQ_MAX_SURVIVORS                   32
+#define NLSF_QUANT_MAX_AMPLITUDE                4
+#define NLSF_QUANT_MAX_AMPLITUDE_EXT            10
+#define NLSF_QUANT_LEVEL_ADJ                    0.1
+#define NLSF_QUANT_DEL_DEC_STATES_LOG2          2
+#define NLSF_QUANT_DEL_DEC_STATES               ( 1 << NLSF_QUANT_DEL_DEC_STATES_LOG2 )
+
+/* Transition filtering for mode switching */
+#define TRANSITION_TIME_MS                      5120    /* 5120 = 64 * FRAME_LENGTH_MS * ( TRANSITION_INT_NUM - 1 ) = 64*(20*4)*/
+#define TRANSITION_NB                           3       /* Hardcoded in tables */
+#define TRANSITION_NA                           2       /* Hardcoded in tables */
+#define TRANSITION_INT_NUM                      5       /* Hardcoded in tables */
+#define TRANSITION_FRAMES                       ( TRANSITION_TIME_MS / MAX_FRAME_LENGTH_MS )
+#define TRANSITION_INT_STEPS                    ( TRANSITION_FRAMES  / ( TRANSITION_INT_NUM - 1 ) )
+
+/* BWE factors to apply after packet loss */
+#define BWE_AFTER_LOSS_Q16                      63570
+
+/* Defines for CN generation */
+#define CNG_BUF_MASK_MAX                        255     /* 2^floor(log2(MAX_FRAME_LENGTH))-1    */
+#define CNG_GAIN_SMTH_Q16                       4634    /* 0.25^(1/4)                           */
+#define CNG_NLSF_SMTH_Q16                       16348   /* 0.25                                 */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/enc_API.c b/drivers/opus/silk/enc_API.c
new file mode 100644
index 0000000000..66a9bb67de
--- /dev/null
+++ b/drivers/opus/silk/enc_API.c
@@ -0,0 +1,556 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+#include "define.h"
+#include "API.h"
+#include "control.h"
+#include "typedef.h"
+#include "stack_alloc.h"
+#include "structs.h"
+#include "tuning_parameters.h"
+#ifdef OPUS_FIXED_POINT
+#include "main_FIX.h"
+#else
+#include "main_FLP.h"
+#endif
+
+/***************************************/
+/* Read control structure from encoder */
+/***************************************/
+static opus_int silk_QueryEncoder(                      /* O    Returns error code                              */
+    const void                      *encState,          /* I    State                                           */
+    silk_EncControlStruct           *encStatus          /* O    Encoder Status                                  */
+);
+
+/****************************************/
+/* Encoder functions                    */
+/****************************************/
+
+opus_int silk_Get_Encoder_Size(                         /* O    Returns error code                              */
+    opus_int                        *encSizeBytes       /* O    Number of bytes in SILK encoder state           */
+)
+{
+    opus_int ret = SILK_NO_ERROR;
+
+    *encSizeBytes = sizeof( silk_encoder );
+
+    return ret;
+}
+
+/*************************/
+/* Init or Reset encoder */
+/*************************/
+opus_int silk_InitEncoder(                              /* O    Returns error code                              */
+    void                            *encState,          /* I/O  State                                           */
+    int                              arch,              /* I    Run-time architecture                           */
+    silk_EncControlStruct           *encStatus          /* O    Encoder Status                                  */
+)
+{
+    silk_encoder *psEnc;
+    opus_int n, ret = SILK_NO_ERROR;
+
+    psEnc = (silk_encoder *)encState;
+
+    /* Reset encoder */
+    silk_memset( psEnc, 0, sizeof( silk_encoder ) );
+    for( n = 0; n < ENCODER_NUM_CHANNELS; n++ ) {
+        if( ret += silk_init_encoder( &psEnc->state_Fxx[ n ], arch ) ) {
+            silk_assert( 0 );
+        }
+    }
+
+    psEnc->nChannelsAPI = 1;
+    psEnc->nChannelsInternal = 1;
+
+    /* Read control structure */
+    if( ret += silk_QueryEncoder( encState, encStatus ) ) {
+        silk_assert( 0 );
+    }
+
+    return ret;
+}
+
+/***************************************/
+/* Read control structure from encoder */
+/***************************************/
+static opus_int silk_QueryEncoder(                      /* O    Returns error code                              */
+    const void                      *encState,          /* I    State                                           */
+    silk_EncControlStruct           *encStatus          /* O    Encoder Status                                  */
+)
+{
+    opus_int ret = SILK_NO_ERROR;
+    silk_encoder_state_Fxx *state_Fxx;
+    silk_encoder *psEnc = (silk_encoder *)encState;
+
+    state_Fxx = psEnc->state_Fxx;
+
+    encStatus->nChannelsAPI              = psEnc->nChannelsAPI;
+    encStatus->nChannelsInternal         = psEnc->nChannelsInternal;
+    encStatus->API_sampleRate            = state_Fxx[ 0 ].sCmn.API_fs_Hz;
+    encStatus->maxInternalSampleRate     = state_Fxx[ 0 ].sCmn.maxInternal_fs_Hz;
+    encStatus->minInternalSampleRate     = state_Fxx[ 0 ].sCmn.minInternal_fs_Hz;
+    encStatus->desiredInternalSampleRate = state_Fxx[ 0 ].sCmn.desiredInternal_fs_Hz;
+    encStatus->payloadSize_ms            = state_Fxx[ 0 ].sCmn.PacketSize_ms;
+    encStatus->bitRate                   = state_Fxx[ 0 ].sCmn.TargetRate_bps;
+    encStatus->packetLossPercentage      = state_Fxx[ 0 ].sCmn.PacketLoss_perc;
+    encStatus->complexity                = state_Fxx[ 0 ].sCmn.Complexity;
+    encStatus->useInBandFEC              = state_Fxx[ 0 ].sCmn.useInBandFEC;
+    encStatus->useDTX                    = state_Fxx[ 0 ].sCmn.useDTX;
+    encStatus->useCBR                    = state_Fxx[ 0 ].sCmn.useCBR;
+    encStatus->internalSampleRate        = silk_SMULBB( state_Fxx[ 0 ].sCmn.fs_kHz, 1000 );
+    encStatus->allowBandwidthSwitch      = state_Fxx[ 0 ].sCmn.allow_bandwidth_switch;
+    encStatus->inWBmodeWithoutVariableLP = state_Fxx[ 0 ].sCmn.fs_kHz == 16 && state_Fxx[ 0 ].sCmn.sLP.mode == 0;
+
+    return ret;
+}
+
+
+/**************************/
+/* Encode frame with Silk */
+/**************************/
+/* Note: if prefillFlag is set, the input must contain 10 ms of audio, irrespective of what                     */
+/* encControl->payloadSize_ms is set to                                                                         */
+opus_int silk_Encode(                                   /* O    Returns error code                              */
+    void                            *encState,          /* I/O  State                                           */
+    silk_EncControlStruct           *encControl,        /* I    Control status                                  */
+    const opus_int16                *samplesIn,         /* I    Speech sample input vector                      */
+    opus_int                        nSamplesIn,         /* I    Number of samples in input vector               */
+    ec_enc                          *psRangeEnc,        /* I/O  Compressor data structure                       */
+    opus_int32                      *nBytesOut,         /* I/O  Number of bytes in payload (input: Max bytes)   */
+    const opus_int                  prefillFlag         /* I    Flag to indicate prefilling buffers no coding   */
+)
+{
+    opus_int   n, i, nBits, flags, tmp_payloadSize_ms = 0, tmp_complexity = 0, ret = 0;
+    opus_int   nSamplesToBuffer, nSamplesToBufferMax, nBlocksOf10ms;
+    opus_int   nSamplesFromInput = 0, nSamplesFromInputMax;
+    opus_int   speech_act_thr_for_switch_Q8;
+    opus_int32 TargetRate_bps, MStargetRates_bps[ 2 ], channelRate_bps, LBRR_symbol, sum;
+    silk_encoder *psEnc = ( silk_encoder * )encState;
+    VARDECL( opus_int16, buf );
+    opus_int transition, curr_block, tot_blocks;
+    SAVE_STACK;
+
+    if (encControl->reducedDependency)
+    {
+       psEnc->state_Fxx[0].sCmn.first_frame_after_reset = 1;
+       psEnc->state_Fxx[1].sCmn.first_frame_after_reset = 1;
+    }
+    psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded = psEnc->state_Fxx[ 1 ].sCmn.nFramesEncoded = 0;
+
+    /* Check values in encoder control structure */
+    if( ( ret = check_control_input( encControl ) != 0 ) ) {
+        silk_assert( 0 );
+        RESTORE_STACK;
+        return ret;
+    }
+
+    encControl->switchReady = 0;
+
+    if( encControl->nChannelsInternal > psEnc->nChannelsInternal ) {
+        /* Mono -> Stereo transition: init state of second channel and stereo state */
+        ret += silk_init_encoder( &psEnc->state_Fxx[ 1 ], psEnc->state_Fxx[ 0 ].sCmn.arch );
+        silk_memset( psEnc->sStereo.pred_prev_Q13, 0, sizeof( psEnc->sStereo.pred_prev_Q13 ) );
+        silk_memset( psEnc->sStereo.sSide, 0, sizeof( psEnc->sStereo.sSide ) );
+        psEnc->sStereo.mid_side_amp_Q0[ 0 ] = 0;
+        psEnc->sStereo.mid_side_amp_Q0[ 1 ] = 1;
+        psEnc->sStereo.mid_side_amp_Q0[ 2 ] = 0;
+        psEnc->sStereo.mid_side_amp_Q0[ 3 ] = 1;
+        psEnc->sStereo.width_prev_Q14 = 0;
+        psEnc->sStereo.smth_width_Q14 = SILK_FIX_CONST( 1, 14 );
+        if( psEnc->nChannelsAPI == 2 ) {
+            silk_memcpy( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state, &psEnc->state_Fxx[ 0 ].sCmn.resampler_state, sizeof( silk_resampler_state_struct ) );
+            silk_memcpy( &psEnc->state_Fxx[ 1 ].sCmn.In_HP_State,     &psEnc->state_Fxx[ 0 ].sCmn.In_HP_State,     sizeof( psEnc->state_Fxx[ 1 ].sCmn.In_HP_State ) );
+        }
+    }
+
+    transition = (encControl->payloadSize_ms != psEnc->state_Fxx[ 0 ].sCmn.PacketSize_ms) || (psEnc->nChannelsInternal != encControl->nChannelsInternal);
+
+    psEnc->nChannelsAPI = encControl->nChannelsAPI;
+    psEnc->nChannelsInternal = encControl->nChannelsInternal;
+
+    nBlocksOf10ms = silk_DIV32( 100 * nSamplesIn, encControl->API_sampleRate );
+    tot_blocks = ( nBlocksOf10ms > 1 ) ? nBlocksOf10ms >> 1 : 1;
+    curr_block = 0;
+    if( prefillFlag ) {
+        /* Only accept input length of 10 ms */
+        if( nBlocksOf10ms != 1 ) {
+            silk_assert( 0 );
+            RESTORE_STACK;
+            return SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
+        }
+        /* Reset Encoder */
+        for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+            ret = silk_init_encoder( &psEnc->state_Fxx[ n ], psEnc->state_Fxx[ n ].sCmn.arch );
+            silk_assert( !ret );
+        }
+        tmp_payloadSize_ms = encControl->payloadSize_ms;
+        encControl->payloadSize_ms = 10;
+        tmp_complexity = encControl->complexity;
+        encControl->complexity = 0;
+        for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+            psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0;
+            psEnc->state_Fxx[ n ].sCmn.prefillFlag = 1;
+        }
+    } else {
+        /* Only accept input lengths that are a multiple of 10 ms */
+        if( nBlocksOf10ms * encControl->API_sampleRate != 100 * nSamplesIn || nSamplesIn < 0 ) {
+            silk_assert( 0 );
+            RESTORE_STACK;
+            return SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
+        }
+        /* Make sure no more than one packet can be produced */
+        if( 1000 * (opus_int32)nSamplesIn > encControl->payloadSize_ms * encControl->API_sampleRate ) {
+            silk_assert( 0 );
+            RESTORE_STACK;
+            return SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
+        }
+    }
+
+    TargetRate_bps = silk_RSHIFT32( encControl->bitRate, encControl->nChannelsInternal - 1 );
+    for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+        /* Force the side channel to the same rate as the mid */
+        opus_int force_fs_kHz = (n==1) ? psEnc->state_Fxx[0].sCmn.fs_kHz : 0;
+        if( ( ret = silk_control_encoder( &psEnc->state_Fxx[ n ], encControl, TargetRate_bps, psEnc->allowBandwidthSwitch, n, force_fs_kHz ) ) != 0 ) {
+            silk_assert( 0 );
+            RESTORE_STACK;
+            return ret;
+        }
+        if( psEnc->state_Fxx[n].sCmn.first_frame_after_reset || transition ) {
+            for( i = 0; i < psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket; i++ ) {
+                psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ] = 0;
+            }
+        }
+        psEnc->state_Fxx[ n ].sCmn.inDTX = psEnc->state_Fxx[ n ].sCmn.useDTX;
+    }
+    silk_assert( encControl->nChannelsInternal == 1 || psEnc->state_Fxx[ 0 ].sCmn.fs_kHz == psEnc->state_Fxx[ 1 ].sCmn.fs_kHz );
+
+    /* Input buffering/resampling and encoding */
+    nSamplesToBufferMax =
+        10 * nBlocksOf10ms * psEnc->state_Fxx[ 0 ].sCmn.fs_kHz;
+    nSamplesFromInputMax =
+        silk_DIV32_16( nSamplesToBufferMax *
+                           psEnc->state_Fxx[ 0 ].sCmn.API_fs_Hz,
+                       psEnc->state_Fxx[ 0 ].sCmn.fs_kHz * 1000 );
+    ALLOC( buf, nSamplesFromInputMax, opus_int16 );
+    while( 1 ) {
+        nSamplesToBuffer  = psEnc->state_Fxx[ 0 ].sCmn.frame_length - psEnc->state_Fxx[ 0 ].sCmn.inputBufIx;
+        nSamplesToBuffer  = silk_min( nSamplesToBuffer, nSamplesToBufferMax );
+        nSamplesFromInput = silk_DIV32_16( nSamplesToBuffer * psEnc->state_Fxx[ 0 ].sCmn.API_fs_Hz, psEnc->state_Fxx[ 0 ].sCmn.fs_kHz * 1000 );
+        /* Resample and write to buffer */
+        if( encControl->nChannelsAPI == 2 && encControl->nChannelsInternal == 2 ) {
+            opus_int id = psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded;
+            for( n = 0; n < nSamplesFromInput; n++ ) {
+                buf[ n ] = samplesIn[ 2 * n ];
+            }
+            /* Making sure to start both resamplers from the same state when switching from mono to stereo */
+            if( psEnc->nPrevChannelsInternal == 1 && id==0 ) {
+               silk_memcpy( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state, &psEnc->state_Fxx[ 0 ].sCmn.resampler_state, sizeof(psEnc->state_Fxx[ 1 ].sCmn.resampler_state));
+            }
+
+            ret += silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state,
+                &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput );
+            psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer;
+
+            nSamplesToBuffer  = psEnc->state_Fxx[ 1 ].sCmn.frame_length - psEnc->state_Fxx[ 1 ].sCmn.inputBufIx;
+            nSamplesToBuffer  = silk_min( nSamplesToBuffer, 10 * nBlocksOf10ms * psEnc->state_Fxx[ 1 ].sCmn.fs_kHz );
+            for( n = 0; n < nSamplesFromInput; n++ ) {
+                buf[ n ] = samplesIn[ 2 * n + 1 ];
+            }
+            ret += silk_resampler( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state,
+                &psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ psEnc->state_Fxx[ 1 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput );
+
+            psEnc->state_Fxx[ 1 ].sCmn.inputBufIx += nSamplesToBuffer;
+        } else if( encControl->nChannelsAPI == 2 && encControl->nChannelsInternal == 1 ) {
+            /* Combine left and right channels before resampling */
+            for( n = 0; n < nSamplesFromInput; n++ ) {
+                sum = samplesIn[ 2 * n ] + samplesIn[ 2 * n + 1 ];
+                buf[ n ] = (opus_int16)silk_RSHIFT_ROUND( sum,  1 );
+            }
+            ret += silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state,
+                &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput );
+            /* On the first mono frame, average the results for the two resampler states  */
+            if( psEnc->nPrevChannelsInternal == 2 && psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded == 0 ) {
+               ret += silk_resampler( &psEnc->state_Fxx[ 1 ].sCmn.resampler_state,
+                   &psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ psEnc->state_Fxx[ 1 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput );
+               for( n = 0; n < psEnc->state_Fxx[ 0 ].sCmn.frame_length; n++ ) {
+                  psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx+n+2 ] =
+                        silk_RSHIFT(psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx+n+2 ]
+                                  + psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ psEnc->state_Fxx[ 1 ].sCmn.inputBufIx+n+2 ], 1);
+               }
+            }
+            psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer;
+        } else {
+            silk_assert( encControl->nChannelsAPI == 1 && encControl->nChannelsInternal == 1 );
+            silk_memcpy(buf, samplesIn, nSamplesFromInput*sizeof(opus_int16));
+            ret += silk_resampler( &psEnc->state_Fxx[ 0 ].sCmn.resampler_state,
+                &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.inputBufIx + 2 ], buf, nSamplesFromInput );
+            psEnc->state_Fxx[ 0 ].sCmn.inputBufIx += nSamplesToBuffer;
+        }
+
+        samplesIn  += nSamplesFromInput * encControl->nChannelsAPI;
+        nSamplesIn -= nSamplesFromInput;
+
+        /* Default */
+        psEnc->allowBandwidthSwitch = 0;
+
+        /* Silk encoder */
+        if( psEnc->state_Fxx[ 0 ].sCmn.inputBufIx >= psEnc->state_Fxx[ 0 ].sCmn.frame_length ) {
+            /* Enough data in input buffer, so encode */
+            silk_assert( psEnc->state_Fxx[ 0 ].sCmn.inputBufIx == psEnc->state_Fxx[ 0 ].sCmn.frame_length );
+            silk_assert( encControl->nChannelsInternal == 1 || psEnc->state_Fxx[ 1 ].sCmn.inputBufIx == psEnc->state_Fxx[ 1 ].sCmn.frame_length );
+
+            /* Deal with LBRR data */
+            if( psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded == 0 && !prefillFlag ) {
+                /* Create space at start of payload for VAD and FEC flags */
+                opus_uint8 iCDF[ 2 ] = { 0, 0 };
+                iCDF[ 0 ] = 256 - silk_RSHIFT( 256, ( psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket + 1 ) * encControl->nChannelsInternal );
+                ec_enc_icdf( psRangeEnc, 0, iCDF, 8 );
+
+                /* Encode any LBRR data from previous packet */
+                /* Encode LBRR flags */
+                for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+                    LBRR_symbol = 0;
+                    for( i = 0; i < psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket; i++ ) {
+                        LBRR_symbol |= silk_LSHIFT( psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ], i );
+                    }
+                    psEnc->state_Fxx[ n ].sCmn.LBRR_flag = LBRR_symbol > 0 ? 1 : 0;
+                    if( LBRR_symbol && psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket > 1 ) {
+                        ec_enc_icdf( psRangeEnc, LBRR_symbol - 1, silk_LBRR_flags_iCDF_ptr[ psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket - 2 ], 8 );
+                    }
+                }
+
+                /* Code LBRR indices and excitation signals */
+                for( i = 0; i < psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket; i++ ) {
+                    for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+                        if( psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i ] ) {
+                            opus_int condCoding;
+
+                            if( encControl->nChannelsInternal == 2 && n == 0 ) {
+                                silk_stereo_encode_pred( psRangeEnc, psEnc->sStereo.predIx[ i ] );
+                                /* For LBRR data there's no need to code the mid-only flag if the side-channel LBRR flag is set */
+                                if( psEnc->state_Fxx[ 1 ].sCmn.LBRR_flags[ i ] == 0 ) {
+                                    silk_stereo_encode_mid_only( psRangeEnc, psEnc->sStereo.mid_only_flags[ i ] );
+                                }
+                            }
+                            /* Use conditional coding if previous frame available */
+                            if( i > 0 && psEnc->state_Fxx[ n ].sCmn.LBRR_flags[ i - 1 ] ) {
+                                condCoding = CODE_CONDITIONALLY;
+                            } else {
+                                condCoding = CODE_INDEPENDENTLY;
+                            }
+                            silk_encode_indices( &psEnc->state_Fxx[ n ].sCmn, psRangeEnc, i, 1, condCoding );
+                            silk_encode_pulses( psRangeEnc, psEnc->state_Fxx[ n ].sCmn.indices_LBRR[i].signalType, psEnc->state_Fxx[ n ].sCmn.indices_LBRR[i].quantOffsetType,
+                                psEnc->state_Fxx[ n ].sCmn.pulses_LBRR[ i ], psEnc->state_Fxx[ n ].sCmn.frame_length );
+                        }
+                    }
+                }
+
+                /* Reset LBRR flags */
+                for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+                    silk_memset( psEnc->state_Fxx[ n ].sCmn.LBRR_flags, 0, sizeof( psEnc->state_Fxx[ n ].sCmn.LBRR_flags ) );
+                }
+            }
+
+            silk_HP_variable_cutoff( psEnc->state_Fxx );
+
+            /* Total target bits for packet */
+            nBits = silk_DIV32_16( silk_MUL( encControl->bitRate, encControl->payloadSize_ms ), 1000 );
+            /* Subtract half of the bits already used */
+            if( !prefillFlag ) {
+                nBits -= ec_tell( psRangeEnc ) >> 1;
+            }
+            /* Divide by number of uncoded frames left in packet */
+            nBits = silk_DIV32_16( nBits, psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket - psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded );
+            /* Convert to bits/second */
+            if( encControl->payloadSize_ms == 10 ) {
+                TargetRate_bps = silk_SMULBB( nBits, 100 );
+            } else {
+                TargetRate_bps = silk_SMULBB( nBits, 50 );
+            }
+            /* Subtract fraction of bits in excess of target in previous packets */
+            TargetRate_bps -= silk_DIV32_16( silk_MUL( psEnc->nBitsExceeded, 1000 ), BITRESERVOIR_DECAY_TIME_MS );
+            /* Never exceed input bitrate */
+            TargetRate_bps = silk_LIMIT( TargetRate_bps, encControl->bitRate, 5000 );
+
+            /* Convert Left/Right to Mid/Side */
+            if( encControl->nChannelsInternal == 2 ) {
+                silk_stereo_LR_to_MS( &psEnc->sStereo, &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ 2 ], &psEnc->state_Fxx[ 1 ].sCmn.inputBuf[ 2 ],
+                    psEnc->sStereo.predIx[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ], &psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ],
+                    MStargetRates_bps, TargetRate_bps, psEnc->state_Fxx[ 0 ].sCmn.speech_activity_Q8, encControl->toMono,
+                    psEnc->state_Fxx[ 0 ].sCmn.fs_kHz, psEnc->state_Fxx[ 0 ].sCmn.frame_length );
+                if( psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] == 0 ) {
+                    /* Reset side channel encoder memory for first frame with side coding */
+                    if( psEnc->prev_decode_only_middle == 1 ) {
+                        silk_memset( &psEnc->state_Fxx[ 1 ].sShape,               0, sizeof( psEnc->state_Fxx[ 1 ].sShape ) );
+                        silk_memset( &psEnc->state_Fxx[ 1 ].sPrefilt,             0, sizeof( psEnc->state_Fxx[ 1 ].sPrefilt ) );
+                        silk_memset( &psEnc->state_Fxx[ 1 ].sCmn.sNSQ,            0, sizeof( psEnc->state_Fxx[ 1 ].sCmn.sNSQ ) );
+                        silk_memset( psEnc->state_Fxx[ 1 ].sCmn.prev_NLSFq_Q15,   0, sizeof( psEnc->state_Fxx[ 1 ].sCmn.prev_NLSFq_Q15 ) );
+                        silk_memset( &psEnc->state_Fxx[ 1 ].sCmn.sLP.In_LP_State, 0, sizeof( psEnc->state_Fxx[ 1 ].sCmn.sLP.In_LP_State ) );
+                        psEnc->state_Fxx[ 1 ].sCmn.prevLag                 = 100;
+                        psEnc->state_Fxx[ 1 ].sCmn.sNSQ.lagPrev            = 100;
+                        psEnc->state_Fxx[ 1 ].sShape.LastGainIndex         = 10;
+                        psEnc->state_Fxx[ 1 ].sCmn.prevSignalType          = TYPE_NO_VOICE_ACTIVITY;
+                        psEnc->state_Fxx[ 1 ].sCmn.sNSQ.prev_gain_Q16      = 65536;
+                        psEnc->state_Fxx[ 1 ].sCmn.first_frame_after_reset = 1;
+                    }
+                    silk_encode_do_VAD_Fxx( &psEnc->state_Fxx[ 1 ] );
+                } else {
+                    psEnc->state_Fxx[ 1 ].sCmn.VAD_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] = 0;
+                }
+                if( !prefillFlag ) {
+                    silk_stereo_encode_pred( psRangeEnc, psEnc->sStereo.predIx[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] );
+                    if( psEnc->state_Fxx[ 1 ].sCmn.VAD_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] == 0 ) {
+                        silk_stereo_encode_mid_only( psRangeEnc, psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded ] );
+                    }
+                }
+            } else {
+                /* Buffering */
+                silk_memcpy( psEnc->state_Fxx[ 0 ].sCmn.inputBuf, psEnc->sStereo.sMid, 2 * sizeof( opus_int16 ) );
+                silk_memcpy( psEnc->sStereo.sMid, &psEnc->state_Fxx[ 0 ].sCmn.inputBuf[ psEnc->state_Fxx[ 0 ].sCmn.frame_length ], 2 * sizeof( opus_int16 ) );
+            }
+            silk_encode_do_VAD_Fxx( &psEnc->state_Fxx[ 0 ] );
+
+            /* Encode */
+            for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+                opus_int maxBits, useCBR;
+
+                /* Handling rate constraints */
+                maxBits = encControl->maxBits;
+                if( tot_blocks == 2 && curr_block == 0 ) {
+                    maxBits = maxBits * 3 / 5;
+                } else if( tot_blocks == 3 ) {
+                    if( curr_block == 0 ) {
+                        maxBits = maxBits * 2 / 5;
+                    } else if( curr_block == 1 ) {
+                        maxBits = maxBits * 3 / 4;
+                    }
+                }
+                useCBR = encControl->useCBR && curr_block == tot_blocks - 1;
+
+                if( encControl->nChannelsInternal == 1 ) {
+                    channelRate_bps = TargetRate_bps;
+                } else {
+                    channelRate_bps = MStargetRates_bps[ n ];
+                    if( n == 0 && MStargetRates_bps[ 1 ] > 0 ) {
+                        useCBR = 0;
+                        /* Give mid up to 1/2 of the max bits for that frame */
+                        maxBits -= encControl->maxBits / ( tot_blocks * 2 );
+                    }
+                }
+
+                if( channelRate_bps > 0 ) {
+                    opus_int condCoding;
+
+                    silk_control_SNR( &psEnc->state_Fxx[ n ].sCmn, channelRate_bps );
+
+                    /* Use independent coding if no previous frame available */
+                    if( psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded - n <= 0 ) {
+                        condCoding = CODE_INDEPENDENTLY;
+                    } else if( n > 0 && psEnc->prev_decode_only_middle ) {
+                        /* If we skipped a side frame in this packet, we don't
+                           need LTP scaling; the LTP state is well-defined. */
+                        condCoding = CODE_INDEPENDENTLY_NO_LTP_SCALING;
+                    } else {
+                        condCoding = CODE_CONDITIONALLY;
+                    }
+                    if( ( ret = silk_encode_frame_Fxx( &psEnc->state_Fxx[ n ], nBytesOut, psRangeEnc, condCoding, maxBits, useCBR ) ) != 0 ) {
+                        silk_assert( 0 );
+                    }
+                }
+                psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0;
+                psEnc->state_Fxx[ n ].sCmn.inputBufIx = 0;
+                psEnc->state_Fxx[ n ].sCmn.nFramesEncoded++;
+            }
+            psEnc->prev_decode_only_middle = psEnc->sStereo.mid_only_flags[ psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded - 1 ];
+
+            /* Insert VAD and FEC flags at beginning of bitstream */
+            if( *nBytesOut > 0 && psEnc->state_Fxx[ 0 ].sCmn.nFramesEncoded == psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket) {
+                flags = 0;
+                for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+                    for( i = 0; i < psEnc->state_Fxx[ n ].sCmn.nFramesPerPacket; i++ ) {
+                        flags  = silk_LSHIFT( flags, 1 );
+                        flags |= psEnc->state_Fxx[ n ].sCmn.VAD_flags[ i ];
+                    }
+                    flags  = silk_LSHIFT( flags, 1 );
+                    flags |= psEnc->state_Fxx[ n ].sCmn.LBRR_flag;
+                }
+                if( !prefillFlag ) {
+                    ec_enc_patch_initial_bits( psRangeEnc, flags, ( psEnc->state_Fxx[ 0 ].sCmn.nFramesPerPacket + 1 ) * encControl->nChannelsInternal );
+                }
+
+                /* Return zero bytes if all channels DTXed */
+                if( psEnc->state_Fxx[ 0 ].sCmn.inDTX && ( encControl->nChannelsInternal == 1 || psEnc->state_Fxx[ 1 ].sCmn.inDTX ) ) {
+                    *nBytesOut = 0;
+                }
+
+                psEnc->nBitsExceeded += *nBytesOut * 8;
+                psEnc->nBitsExceeded -= silk_DIV32_16( silk_MUL( encControl->bitRate, encControl->payloadSize_ms ), 1000 );
+                psEnc->nBitsExceeded  = silk_LIMIT( psEnc->nBitsExceeded, 0, 10000 );
+
+                /* Update flag indicating if bandwidth switching is allowed */
+                speech_act_thr_for_switch_Q8 = silk_SMLAWB( SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ),
+                    SILK_FIX_CONST( ( 1 - SPEECH_ACTIVITY_DTX_THRES ) / MAX_BANDWIDTH_SWITCH_DELAY_MS, 16 + 8 ), psEnc->timeSinceSwitchAllowed_ms );
+                if( psEnc->state_Fxx[ 0 ].sCmn.speech_activity_Q8 < speech_act_thr_for_switch_Q8 ) {
+                    psEnc->allowBandwidthSwitch = 1;
+                    psEnc->timeSinceSwitchAllowed_ms = 0;
+                } else {
+                    psEnc->allowBandwidthSwitch = 0;
+                    psEnc->timeSinceSwitchAllowed_ms += encControl->payloadSize_ms;
+                }
+            }
+
+            if( nSamplesIn == 0 ) {
+                break;
+            }
+        } else {
+            break;
+        }
+        curr_block++;
+    }
+
+    psEnc->nPrevChannelsInternal = encControl->nChannelsInternal;
+
+    encControl->allowBandwidthSwitch = psEnc->allowBandwidthSwitch;
+    encControl->inWBmodeWithoutVariableLP = psEnc->state_Fxx[ 0 ].sCmn.fs_kHz == 16 && psEnc->state_Fxx[ 0 ].sCmn.sLP.mode == 0;
+    encControl->internalSampleRate = silk_SMULBB( psEnc->state_Fxx[ 0 ].sCmn.fs_kHz, 1000 );
+    encControl->stereoWidth_Q14 = encControl->toMono ? 0 : psEnc->sStereo.smth_width_Q14;
+    if( prefillFlag ) {
+        encControl->payloadSize_ms = tmp_payloadSize_ms;
+        encControl->complexity = tmp_complexity;
+        for( n = 0; n < encControl->nChannelsInternal; n++ ) {
+            psEnc->state_Fxx[ n ].sCmn.controlled_since_last_payload = 0;
+            psEnc->state_Fxx[ n ].sCmn.prefillFlag = 0;
+        }
+    }
+
+    RESTORE_STACK;
+    return ret;
+}
+
diff --git a/drivers/opus/silk/encode_indices.c b/drivers/opus/silk/encode_indices.c
new file mode 100644
index 0000000000..c6679b34f6
--- /dev/null
+++ b/drivers/opus/silk/encode_indices.c
@@ -0,0 +1,181 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Encode side-information parameters to payload */
+void silk_encode_indices(
+    silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
+    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
+    opus_int                    FrameIndex,                     /* I    Frame number                                */
+    opus_int                    encode_LBRR,                    /* I    Flag indicating LBRR data is being encoded  */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+)
+{
+    opus_int   i, k, typeOffset;
+    opus_int   encode_absolute_lagIndex, delta_lagIndex;
+    opus_int16 ec_ix[ MAX_LPC_ORDER ];
+    opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
+    const SideInfoIndices *psIndices;
+
+    if( encode_LBRR ) {
+         psIndices = &psEncC->indices_LBRR[ FrameIndex ];
+    } else {
+         psIndices = &psEncC->indices;
+    }
+
+    /*******************************************/
+    /* Encode signal type and quantizer offset */
+    /*******************************************/
+    typeOffset = 2 * psIndices->signalType + psIndices->quantOffsetType;
+    silk_assert( typeOffset >= 0 && typeOffset < 6 );
+    silk_assert( encode_LBRR == 0 || typeOffset >= 2 );
+    if( encode_LBRR || typeOffset >= 2 ) {
+        ec_enc_icdf( psRangeEnc, typeOffset - 2, silk_type_offset_VAD_iCDF, 8 );
+    } else {
+        ec_enc_icdf( psRangeEnc, typeOffset, silk_type_offset_no_VAD_iCDF, 8 );
+    }
+
+    /****************/
+    /* Encode gains */
+    /****************/
+    /* first subframe */
+    if( condCoding == CODE_CONDITIONALLY ) {
+        /* conditional coding */
+        silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
+        ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ], silk_delta_gain_iCDF, 8 );
+    } else {
+        /* independent coding, in two stages: MSB bits followed by 3 LSBs */
+        silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < N_LEVELS_QGAIN );
+        ec_enc_icdf( psRangeEnc, silk_RSHIFT( psIndices->GainsIndices[ 0 ], 3 ), silk_gain_iCDF[ psIndices->signalType ], 8 );
+        ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ] & 7, silk_uniform8_iCDF, 8 );
+    }
+
+    /* remaining subframes */
+    for( i = 1; i < psEncC->nb_subfr; i++ ) {
+        silk_assert( psIndices->GainsIndices[ i ] >= 0 && psIndices->GainsIndices[ i ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
+        ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ i ], silk_delta_gain_iCDF, 8 );
+    }
+
+    /****************/
+    /* Encode NLSFs */
+    /****************/
+    ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ 0 ], &psEncC->psNLSF_CB->CB1_iCDF[ ( psIndices->signalType >> 1 ) * psEncC->psNLSF_CB->nVectors ], 8 );
+    silk_NLSF_unpack( ec_ix, pred_Q8, psEncC->psNLSF_CB, psIndices->NLSFIndices[ 0 ] );
+    silk_assert( psEncC->psNLSF_CB->order == psEncC->predictLPCOrder );
+    for( i = 0; i < psEncC->psNLSF_CB->order; i++ ) {
+        if( psIndices->NLSFIndices[ i+1 ] >= NLSF_QUANT_MAX_AMPLITUDE ) {
+            ec_enc_icdf( psRangeEnc, 2 * NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
+            ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
+        } else if( psIndices->NLSFIndices[ i+1 ] <= -NLSF_QUANT_MAX_AMPLITUDE ) {
+            ec_enc_icdf( psRangeEnc, 0, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
+            ec_enc_icdf( psRangeEnc, -psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
+        } else {
+            ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] + NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
+        }
+    }
+
+    /* Encode NLSF interpolation factor */
+    if( psEncC->nb_subfr == MAX_NB_SUBFR ) {
+        silk_assert( psIndices->NLSFInterpCoef_Q2 >= 0 && psIndices->NLSFInterpCoef_Q2 < 5 );
+        ec_enc_icdf( psRangeEnc, psIndices->NLSFInterpCoef_Q2, silk_NLSF_interpolation_factor_iCDF, 8 );
+    }
+
+    if( psIndices->signalType == TYPE_VOICED )
+    {
+        /*********************/
+        /* Encode pitch lags */
+        /*********************/
+        /* lag index */
+        encode_absolute_lagIndex = 1;
+        if( condCoding == CODE_CONDITIONALLY && psEncC->ec_prevSignalType == TYPE_VOICED ) {
+            /* Delta Encoding */
+            delta_lagIndex = psIndices->lagIndex - psEncC->ec_prevLagIndex;
+            if( delta_lagIndex < -8 || delta_lagIndex > 11 ) {
+                delta_lagIndex = 0;
+            } else {
+                delta_lagIndex = delta_lagIndex + 9;
+                encode_absolute_lagIndex = 0; /* Only use delta */
+            }
+            silk_assert( delta_lagIndex >= 0 && delta_lagIndex < 21 );
+            ec_enc_icdf( psRangeEnc, delta_lagIndex, silk_pitch_delta_iCDF, 8 );
+        }
+        if( encode_absolute_lagIndex ) {
+            /* Absolute encoding */
+            opus_int32 pitch_high_bits, pitch_low_bits;
+            pitch_high_bits = silk_DIV32_16( psIndices->lagIndex, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
+            pitch_low_bits = psIndices->lagIndex - silk_SMULBB( pitch_high_bits, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
+            silk_assert( pitch_low_bits < psEncC->fs_kHz / 2 );
+            silk_assert( pitch_high_bits < 32 );
+            ec_enc_icdf( psRangeEnc, pitch_high_bits, silk_pitch_lag_iCDF, 8 );
+            ec_enc_icdf( psRangeEnc, pitch_low_bits, psEncC->pitch_lag_low_bits_iCDF, 8 );
+        }
+        psEncC->ec_prevLagIndex = psIndices->lagIndex;
+
+        /* Countour index */
+        silk_assert(   psIndices->contourIndex  >= 0 );
+        silk_assert( ( psIndices->contourIndex < 34 && psEncC->fs_kHz  > 8 && psEncC->nb_subfr == 4 ) ||
+                    ( psIndices->contourIndex < 11 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 4 ) ||
+                    ( psIndices->contourIndex < 12 && psEncC->fs_kHz  > 8 && psEncC->nb_subfr == 2 ) ||
+                    ( psIndices->contourIndex <  3 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 2 ) );
+        ec_enc_icdf( psRangeEnc, psIndices->contourIndex, psEncC->pitch_contour_iCDF, 8 );
+
+        /********************/
+        /* Encode LTP gains */
+        /********************/
+        /* PERIndex value */
+        silk_assert( psIndices->PERIndex >= 0 && psIndices->PERIndex < 3 );
+        ec_enc_icdf( psRangeEnc, psIndices->PERIndex, silk_LTP_per_index_iCDF, 8 );
+
+        /* Codebook Indices */
+        for( k = 0; k < psEncC->nb_subfr; k++ ) {
+            silk_assert( psIndices->LTPIndex[ k ] >= 0 && psIndices->LTPIndex[ k ] < ( 8 << psIndices->PERIndex ) );
+            ec_enc_icdf( psRangeEnc, psIndices->LTPIndex[ k ], silk_LTP_gain_iCDF_ptrs[ psIndices->PERIndex ], 8 );
+        }
+
+        /**********************/
+        /* Encode LTP scaling */
+        /**********************/
+        if( condCoding == CODE_INDEPENDENTLY ) {
+            silk_assert( psIndices->LTP_scaleIndex >= 0 && psIndices->LTP_scaleIndex < 3 );
+            ec_enc_icdf( psRangeEnc, psIndices->LTP_scaleIndex, silk_LTPscale_iCDF, 8 );
+        }
+        silk_assert( !condCoding || psIndices->LTP_scaleIndex == 0 );
+    }
+
+    psEncC->ec_prevSignalType = psIndices->signalType;
+
+    /***************/
+    /* Encode seed */
+    /***************/
+    silk_assert( psIndices->Seed >= 0 && psIndices->Seed < 4 );
+    ec_enc_icdf( psRangeEnc, psIndices->Seed, silk_uniform4_iCDF, 8 );
+}
diff --git a/drivers/opus/silk/encode_pulses.c b/drivers/opus/silk/encode_pulses.c
new file mode 100644
index 0000000000..d148b9d1e6
--- /dev/null
+++ b/drivers/opus/silk/encode_pulses.c
@@ -0,0 +1,206 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+/*********************************************/
+/* Encode quantization indices of excitation */
+/*********************************************/
+
+static OPUS_INLINE opus_int combine_and_check(    /* return ok                           */
+    opus_int         *pulses_comb,           /* O                                   */
+    const opus_int   *pulses_in,             /* I                                   */
+    opus_int         max_pulses,             /* I    max value for sum of pulses    */
+    opus_int         len                     /* I    number of output values        */
+)
+{
+    opus_int k, sum;
+
+    for( k = 0; k < len; k++ ) {
+        sum = pulses_in[ 2 * k ] + pulses_in[ 2 * k + 1 ];
+        if( sum > max_pulses ) {
+            return 1;
+        }
+        pulses_comb[ k ] = sum;
+    }
+
+    return 0;
+}
+
+/* Encode quantization indices of excitation */
+void silk_encode_pulses(
+    ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
+    const opus_int              signalType,                     /* I    Signal type                                 */
+    const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
+    opus_int8                   pulses[],                       /* I    quantization indices                        */
+    const opus_int              frame_length                    /* I    Frame length                                */
+)
+{
+    opus_int   i, k, j, iter, bit, nLS, scale_down, RateLevelIndex = 0;
+    opus_int32 abs_q, minSumBits_Q5, sumBits_Q5;
+    VARDECL( opus_int, abs_pulses );
+    VARDECL( opus_int, sum_pulses );
+    VARDECL( opus_int, nRshifts );
+    opus_int   pulses_comb[ 8 ];
+    opus_int   *abs_pulses_ptr;
+    const opus_int8 *pulses_ptr;
+    const opus_uint8 *cdf_ptr;
+    const opus_uint8 *nBits_ptr;
+    SAVE_STACK;
+
+    silk_memset( pulses_comb, 0, 8 * sizeof( opus_int ) ); /* Fixing Valgrind reported problem*/
+
+    /****************************/
+    /* Prepare for shell coding */
+    /****************************/
+    /* Calculate number of shell blocks */
+    silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
+    iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
+    if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
+        silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
+        iter++;
+        silk_memset( &pulses[ frame_length ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof(opus_int8));
+    }
+
+    /* Take the absolute value of the pulses */
+    ALLOC( abs_pulses, iter * SHELL_CODEC_FRAME_LENGTH, opus_int );
+    silk_assert( !( SHELL_CODEC_FRAME_LENGTH & 3 ) );
+    for( i = 0; i < iter * SHELL_CODEC_FRAME_LENGTH; i+=4 ) {
+        abs_pulses[i+0] = ( opus_int )silk_abs( pulses[ i + 0 ] );
+        abs_pulses[i+1] = ( opus_int )silk_abs( pulses[ i + 1 ] );
+        abs_pulses[i+2] = ( opus_int )silk_abs( pulses[ i + 2 ] );
+        abs_pulses[i+3] = ( opus_int )silk_abs( pulses[ i + 3 ] );
+    }
+
+    /* Calc sum pulses per shell code frame */
+    ALLOC( sum_pulses, iter, opus_int );
+    ALLOC( nRshifts, iter, opus_int );
+    abs_pulses_ptr = abs_pulses;
+    for( i = 0; i < iter; i++ ) {
+        nRshifts[ i ] = 0;
+
+        while( 1 ) {
+            /* 1+1 -> 2 */
+            scale_down = combine_and_check( pulses_comb, abs_pulses_ptr, silk_max_pulses_table[ 0 ], 8 );
+            /* 2+2 -> 4 */
+            scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 1 ], 4 );
+            /* 4+4 -> 8 */
+            scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 2 ], 2 );
+            /* 8+8 -> 16 */
+            scale_down += combine_and_check( &sum_pulses[ i ], pulses_comb, silk_max_pulses_table[ 3 ], 1 );
+
+            if( scale_down ) {
+                /* We need to downscale the quantization signal */
+                nRshifts[ i ]++;
+                for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
+                    abs_pulses_ptr[ k ] = silk_RSHIFT( abs_pulses_ptr[ k ], 1 );
+                }
+            } else {
+                /* Jump out of while(1) loop and go to next shell coding frame */
+                break;
+            }
+        }
+        abs_pulses_ptr += SHELL_CODEC_FRAME_LENGTH;
+    }
+
+    /**************/
+    /* Rate level */
+    /**************/
+    /* find rate level that leads to fewest bits for coding of pulses per block info */
+    minSumBits_Q5 = silk_int32_MAX;
+    for( k = 0; k < N_RATE_LEVELS - 1; k++ ) {
+        nBits_ptr  = silk_pulses_per_block_BITS_Q5[ k ];
+        sumBits_Q5 = silk_rate_levels_BITS_Q5[ signalType >> 1 ][ k ];
+        for( i = 0; i < iter; i++ ) {
+            if( nRshifts[ i ] > 0 ) {
+                sumBits_Q5 += nBits_ptr[ MAX_PULSES + 1 ];
+            } else {
+                sumBits_Q5 += nBits_ptr[ sum_pulses[ i ] ];
+            }
+        }
+        if( sumBits_Q5 < minSumBits_Q5 ) {
+            minSumBits_Q5 = sumBits_Q5;
+            RateLevelIndex = k;
+        }
+    }
+    ec_enc_icdf( psRangeEnc, RateLevelIndex, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
+
+    /***************************************************/
+    /* Sum-Weighted-Pulses Encoding                    */
+    /***************************************************/
+    cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
+    for( i = 0; i < iter; i++ ) {
+        if( nRshifts[ i ] == 0 ) {
+            ec_enc_icdf( psRangeEnc, sum_pulses[ i ], cdf_ptr, 8 );
+        } else {
+            ec_enc_icdf( psRangeEnc, MAX_PULSES + 1, cdf_ptr, 8 );
+            for( k = 0; k < nRshifts[ i ] - 1; k++ ) {
+                ec_enc_icdf( psRangeEnc, MAX_PULSES + 1, silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
+            }
+            ec_enc_icdf( psRangeEnc, sum_pulses[ i ], silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
+        }
+    }
+
+    /******************/
+    /* Shell Encoding */
+    /******************/
+    for( i = 0; i < iter; i++ ) {
+        if( sum_pulses[ i ] > 0 ) {
+            silk_shell_encoder( psRangeEnc, &abs_pulses[ i * SHELL_CODEC_FRAME_LENGTH ] );
+        }
+    }
+
+    /****************/
+    /* LSB Encoding */
+    /****************/
+    for( i = 0; i < iter; i++ ) {
+        if( nRshifts[ i ] > 0 ) {
+            pulses_ptr = &pulses[ i * SHELL_CODEC_FRAME_LENGTH ];
+            nLS = nRshifts[ i ] - 1;
+            for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
+                abs_q = (opus_int8)silk_abs( pulses_ptr[ k ] );
+                for( j = nLS; j > 0; j-- ) {
+                    bit = silk_RSHIFT( abs_q, j ) & 1;
+                    ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 );
+                }
+                bit = abs_q & 1;
+                ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 );
+            }
+        }
+    }
+
+    /****************/
+    /* Encode signs */
+    /****************/
+    silk_encode_signs( psRangeEnc, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/errors.h b/drivers/opus/silk/errors.h
new file mode 100644
index 0000000000..45070800f2
--- /dev/null
+++ b/drivers/opus/silk/errors.h
@@ -0,0 +1,98 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_ERRORS_H
+#define SILK_ERRORS_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/******************/
+/* Error messages */
+/******************/
+#define SILK_NO_ERROR                               0
+
+/**************************/
+/* Encoder error messages */
+/**************************/
+
+/* Input length is not a multiple of 10 ms, or length is longer than the packet length */
+#define SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES        -101
+
+/* Sampling frequency not 8000, 12000 or 16000 Hertz */
+#define SILK_ENC_FS_NOT_SUPPORTED                   -102
+
+/* Packet size not 10, 20, 40, or 60 ms */
+#define SILK_ENC_PACKET_SIZE_NOT_SUPPORTED          -103
+
+/* Allocated payload buffer too short */
+#define SILK_ENC_PAYLOAD_BUF_TOO_SHORT              -104
+
+/* Loss rate not between 0 and 100 percent */
+#define SILK_ENC_INVALID_LOSS_RATE                  -105
+
+/* Complexity setting not valid, use 0...10 */
+#define SILK_ENC_INVALID_COMPLEXITY_SETTING         -106
+
+/* Inband FEC setting not valid, use 0 or 1 */
+#define SILK_ENC_INVALID_INBAND_FEC_SETTING         -107
+
+/* DTX setting not valid, use 0 or 1 */
+#define SILK_ENC_INVALID_DTX_SETTING                -108
+
+/* CBR setting not valid, use 0 or 1 */
+#define SILK_ENC_INVALID_CBR_SETTING                -109
+
+/* Internal encoder error */
+#define SILK_ENC_INTERNAL_ERROR                     -110
+
+/* Internal encoder error */
+#define SILK_ENC_INVALID_NUMBER_OF_CHANNELS_ERROR   -111
+
+/**************************/
+/* Decoder error messages */
+/**************************/
+
+/* Output sampling frequency lower than internal decoded sampling frequency */
+#define SILK_DEC_INVALID_SAMPLING_FREQUENCY         -200
+
+/* Payload size exceeded the maximum allowed 1024 bytes */
+#define SILK_DEC_PAYLOAD_TOO_LARGE                  -201
+
+/* Payload has bit errors */
+#define SILK_DEC_PAYLOAD_ERROR                      -202
+
+/* Payload has bit errors */
+#define SILK_DEC_INVALID_FRAME_SIZE                 -203
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/fixed/LTP_analysis_filter_FIX.c b/drivers/opus/silk/fixed/LTP_analysis_filter_FIX.c
new file mode 100644
index 0000000000..1df4b01d20
--- /dev/null
+++ b/drivers/opus/silk/fixed/LTP_analysis_filter_FIX.c
@@ -0,0 +1,85 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+
+void silk_LTP_analysis_filter_FIX(
+    opus_int16                      *LTP_res,                               /* O    LTP residual signal of length MAX_NB_SUBFR * ( pre_length + subfr_length )  */
+    const opus_int16                *x,                                     /* I    Pointer to input signal with at least max( pitchL ) preceding samples       */
+    const opus_int16                LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],/* I    LTP_ORDER LTP coefficients for each MAX_NB_SUBFR subframe                   */
+    const opus_int                  pitchL[ MAX_NB_SUBFR ],                 /* I    Pitch lag, one for each subframe                                            */
+    const opus_int32                invGains_Q16[ MAX_NB_SUBFR ],           /* I    Inverse quantization gains, one for each subframe                           */
+    const opus_int                  subfr_length,                           /* I    Length of each subframe                                                     */
+    const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
+    const opus_int                  pre_length                              /* I    Length of the preceding samples starting at &x[0] for each subframe         */
+)
+{
+    const opus_int16 *x_ptr, *x_lag_ptr;
+    opus_int16   Btmp_Q14[ LTP_ORDER ];
+    opus_int16   *LTP_res_ptr;
+    opus_int     k, i, j;
+    opus_int32   LTP_est;
+
+    x_ptr = x;
+    LTP_res_ptr = LTP_res;
+    for( k = 0; k < nb_subfr; k++ ) {
+
+        x_lag_ptr = x_ptr - pitchL[ k ];
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            Btmp_Q14[ i ] = LTPCoef_Q14[ k * LTP_ORDER + i ];
+        }
+
+        /* LTP analysis FIR filter */
+        for( i = 0; i < subfr_length + pre_length; i++ ) {
+            LTP_res_ptr[ i ] = x_ptr[ i ];
+
+            /* Long-term prediction */
+            LTP_est = silk_SMULBB( x_lag_ptr[ LTP_ORDER / 2 ], Btmp_Q14[ 0 ] );
+            for( j = 1; j < LTP_ORDER; j++ ) {
+                LTP_est = silk_SMLABB_ovflw( LTP_est, x_lag_ptr[ LTP_ORDER / 2 - j ], Btmp_Q14[ j ] );
+            }
+            LTP_est = silk_RSHIFT_ROUND( LTP_est, 14 ); /* round and -> Q0*/
+
+            /* Subtract long-term prediction */
+            LTP_res_ptr[ i ] = (opus_int16)silk_SAT16( (opus_int32)x_ptr[ i ] - LTP_est );
+
+            /* Scale residual */
+            LTP_res_ptr[ i ] = silk_SMULWB( invGains_Q16[ k ], LTP_res_ptr[ i ] );
+
+            x_lag_ptr++;
+        }
+
+        /* Update pointers */
+        LTP_res_ptr += subfr_length + pre_length;
+        x_ptr       += subfr_length;
+    }
+}
+
diff --git a/drivers/opus/silk/fixed/LTP_scale_ctrl_FIX.c b/drivers/opus/silk/fixed/LTP_scale_ctrl_FIX.c
new file mode 100644
index 0000000000..ab6923c5c9
--- /dev/null
+++ b/drivers/opus/silk/fixed/LTP_scale_ctrl_FIX.c
@@ -0,0 +1,53 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+
+/* Calculation of LTP state scaling */
+void silk_LTP_scale_ctrl_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
+    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
+)
+{
+    opus_int round_loss;
+
+    if( condCoding == CODE_INDEPENDENTLY ) {
+        /* Only scale if first frame in packet */
+        round_loss = psEnc->sCmn.PacketLoss_perc + psEnc->sCmn.nFramesPerPacket;
+        psEnc->sCmn.indices.LTP_scaleIndex = (opus_int8)silk_LIMIT(
+            silk_SMULWB( silk_SMULBB( round_loss, psEncCtrl->LTPredCodGain_Q7 ), SILK_FIX_CONST( 0.1, 9 ) ), 0, 2 );
+    } else {
+        /* Default is minimum scaling */
+        psEnc->sCmn.indices.LTP_scaleIndex = 0;
+    }
+    psEncCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ psEnc->sCmn.indices.LTP_scaleIndex ];
+}
diff --git a/drivers/opus/silk/fixed/apply_sine_window_FIX.c b/drivers/opus/silk/fixed/apply_sine_window_FIX.c
new file mode 100644
index 0000000000..0998b49eca
--- /dev/null
+++ b/drivers/opus/silk/fixed/apply_sine_window_FIX.c
@@ -0,0 +1,101 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Apply sine window to signal vector.                                      */
+/* Window types:                                                            */
+/*    1 -> sine window from 0 to pi/2                                       */
+/*    2 -> sine window from pi/2 to pi                                      */
+/* Every other sample is linearly interpolated, for speed.                  */
+/* Window length must be between 16 and 120 (incl) and a multiple of 4.     */
+
+/* Matlab code for table:
+   for k=16:9*4:16+2*9*4, fprintf(' %7.d,', -round(65536*pi ./ (k:4:k+8*4))); fprintf('\n'); end
+*/
+static const opus_int16 freq_table_Q16[ 27 ] = {
+   12111,    9804,    8235,    7100,    6239,    5565,    5022,    4575,    4202,
+    3885,    3612,    3375,    3167,    2984,    2820,    2674,    2542,    2422,
+    2313,    2214,    2123,    2038,    1961,    1889,    1822,    1760,    1702,
+};
+
+void silk_apply_sine_window(
+    opus_int16                  px_win[],           /* O    Pointer to windowed signal                                  */
+    const opus_int16            px[],               /* I    Pointer to input signal                                     */
+    const opus_int              win_type,           /* I    Selects a window type                                       */
+    const opus_int              length              /* I    Window length, multiple of 4                                */
+)
+{
+    opus_int   k, f_Q16, c_Q16;
+    opus_int32 S0_Q16, S1_Q16;
+
+    silk_assert( win_type == 1 || win_type == 2 );
+
+    /* Length must be in a range from 16 to 120 and a multiple of 4 */
+    silk_assert( length >= 16 && length <= 120 );
+    silk_assert( ( length & 3 ) == 0 );
+
+    /* Frequency */
+    k = ( length >> 2 ) - 4;
+    silk_assert( k >= 0 && k <= 26 );
+    f_Q16 = (opus_int)freq_table_Q16[ k ];
+
+    /* Factor used for cosine approximation */
+    c_Q16 = silk_SMULWB( (opus_int32)f_Q16, -f_Q16 );
+    silk_assert( c_Q16 >= -32768 );
+
+    /* initialize state */
+    if( win_type == 1 ) {
+        /* start from 0 */
+        S0_Q16 = 0;
+        /* approximation of sin(f) */
+        S1_Q16 = f_Q16 + silk_RSHIFT( length, 3 );
+    } else {
+        /* start from 1 */
+        S0_Q16 = ( (opus_int32)1 << 16 );
+        /* approximation of cos(f) */
+        S1_Q16 = ( (opus_int32)1 << 16 ) + silk_RSHIFT( c_Q16, 1 ) + silk_RSHIFT( length, 4 );
+    }
+
+    /* Uses the recursive equation:   sin(n*f) = 2 * cos(f) * sin((n-1)*f) - sin((n-2)*f)    */
+    /* 4 samples at a time */
+    for( k = 0; k < length; k += 4 ) {
+        px_win[ k ]     = (opus_int16)silk_SMULWB( silk_RSHIFT( S0_Q16 + S1_Q16, 1 ), px[ k ] );
+        px_win[ k + 1 ] = (opus_int16)silk_SMULWB( S1_Q16, px[ k + 1] );
+        S0_Q16 = silk_SMULWB( S1_Q16, c_Q16 ) + silk_LSHIFT( S1_Q16, 1 ) - S0_Q16 + 1;
+        S0_Q16 = silk_min( S0_Q16, ( (opus_int32)1 << 16 ) );
+
+        px_win[ k + 2 ] = (opus_int16)silk_SMULWB( silk_RSHIFT( S0_Q16 + S1_Q16, 1 ), px[ k + 2] );
+        px_win[ k + 3 ] = (opus_int16)silk_SMULWB( S0_Q16, px[ k + 3 ] );
+        S1_Q16 = silk_SMULWB( S0_Q16, c_Q16 ) + silk_LSHIFT( S0_Q16, 1 ) - S1_Q16;
+        S1_Q16 = silk_min( S1_Q16, ( (opus_int32)1 << 16 ) );
+    }
+}
diff --git a/drivers/opus/silk/fixed/autocorr_FIX.c b/drivers/opus/silk/fixed/autocorr_FIX.c
new file mode 100644
index 0000000000..438b42f85b
--- /dev/null
+++ b/drivers/opus/silk/fixed/autocorr_FIX.c
@@ -0,0 +1,48 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "celt_lpc.h"
+
+/* Compute autocorrelation */
+void silk_autocorr(
+    opus_int32                  *results,           /* O    Result (length correlationCount)                            */
+    opus_int                    *scale,             /* O    Scaling of the correlation vector                           */
+    const opus_int16            *inputData,         /* I    Input data to correlate                                     */
+    const opus_int              inputDataSize,      /* I    Length of input                                             */
+    const opus_int              correlationCount,   /* I    Number of correlation taps to compute                       */
+    int                         arch                /* I    Run-time architecture                                       */
+)
+{
+    opus_int   corrCount;
+    corrCount = silk_min_int( inputDataSize, correlationCount );
+    *scale = _celt_autocorr(inputData, results, NULL, 0, corrCount-1, inputDataSize, arch);
+}
diff --git a/drivers/opus/silk/fixed/burg_modified_FIX.c b/drivers/opus/silk/fixed/burg_modified_FIX.c
new file mode 100644
index 0000000000..ce2a560e6d
--- /dev/null
+++ b/drivers/opus/silk/fixed/burg_modified_FIX.c
@@ -0,0 +1,279 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "define.h"
+#include "tuning_parameters.h"
+#include "pitch.h"
+
+#define MAX_FRAME_SIZE              384             /* subfr_length * nb_subfr = ( 0.005 * 16000 + 16 ) * 4 = 384 */
+
+#define QA                          25
+#define N_BITS_HEAD_ROOM            2
+#define MIN_RSHIFTS                 -16
+#define MAX_RSHIFTS                 (32 - QA)
+
+/* Compute reflection coefficients from input signal */
+void silk_burg_modified(
+    opus_int32                  *res_nrg,           /* O    Residual energy                                             */
+    opus_int                    *res_nrg_Q,         /* O    Residual energy Q value                                     */
+    opus_int32                  A_Q16[],            /* O    Prediction coefficients (length order)                      */
+    const opus_int16            x[],                /* I    Input signal, length: nb_subfr * ( D + subfr_length )       */
+    const opus_int32            minInvGain_Q30,     /* I    Inverse of max prediction gain                              */
+    const opus_int              subfr_length,       /* I    Input signal subframe length (incl. D preceding samples)    */
+    const opus_int              nb_subfr,           /* I    Number of subframes stacked in x                            */
+    const opus_int              D,                  /* I    Order                                                       */
+    int                         arch                /* I    Run-time architecture                                       */
+)
+{
+    opus_int         k, n, s, lz, rshifts, rshifts_extra, reached_max_gain;
+    opus_int32       C0, num, nrg, rc_Q31, invGain_Q30, Atmp_QA, Atmp1, tmp1, tmp2, x1, x2;
+    const opus_int16 *x_ptr;
+    opus_int32       C_first_row[ SILK_MAX_ORDER_LPC ];
+    opus_int32       C_last_row[  SILK_MAX_ORDER_LPC ];
+    opus_int32       Af_QA[       SILK_MAX_ORDER_LPC ];
+    opus_int32       CAf[ SILK_MAX_ORDER_LPC + 1 ];
+    opus_int32       CAb[ SILK_MAX_ORDER_LPC + 1 ];
+    opus_int32       xcorr[ SILK_MAX_ORDER_LPC ];
+
+    silk_assert( subfr_length * nb_subfr <= MAX_FRAME_SIZE );
+
+    /* Compute autocorrelations, added over subframes */
+    silk_sum_sqr_shift( &C0, &rshifts, x, nb_subfr * subfr_length );
+    if( rshifts > MAX_RSHIFTS ) {
+        C0 = silk_LSHIFT32( C0, rshifts - MAX_RSHIFTS );
+        silk_assert( C0 > 0 );
+        rshifts = MAX_RSHIFTS;
+    } else {
+        lz = silk_CLZ32( C0 ) - 1;
+        rshifts_extra = N_BITS_HEAD_ROOM - lz;
+        if( rshifts_extra > 0 ) {
+            rshifts_extra = silk_min( rshifts_extra, MAX_RSHIFTS - rshifts );
+            C0 = silk_RSHIFT32( C0, rshifts_extra );
+        } else {
+            rshifts_extra = silk_max( rshifts_extra, MIN_RSHIFTS - rshifts );
+            C0 = silk_LSHIFT32( C0, -rshifts_extra );
+        }
+        rshifts += rshifts_extra;
+    }
+    CAb[ 0 ] = CAf[ 0 ] = C0 + silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ) + 1;                                /* Q(-rshifts) */
+    silk_memset( C_first_row, 0, SILK_MAX_ORDER_LPC * sizeof( opus_int32 ) );
+    if( rshifts > 0 ) {
+        for( s = 0; s < nb_subfr; s++ ) {
+            x_ptr = x + s * subfr_length;
+            for( n = 1; n < D + 1; n++ ) {
+                C_first_row[ n - 1 ] += (opus_int32)silk_RSHIFT64(
+                    silk_inner_prod16_aligned_64( x_ptr, x_ptr + n, subfr_length - n ), rshifts );
+            }
+        }
+    } else {
+        for( s = 0; s < nb_subfr; s++ ) {
+            int i;
+            opus_int32 d;
+            x_ptr = x + s * subfr_length;
+            celt_pitch_xcorr(x_ptr, x_ptr + 1, xcorr, subfr_length - D, D, arch );
+            for( n = 1; n < D + 1; n++ ) {
+               for ( i = n + subfr_length - D, d = 0; i < subfr_length; i++ )
+                  d = MAC16_16( d, x_ptr[ i ], x_ptr[ i - n ] );
+               xcorr[ n - 1 ] += d;
+            }
+            for( n = 1; n < D + 1; n++ ) {
+                C_first_row[ n - 1 ] += silk_LSHIFT32( xcorr[ n - 1 ], -rshifts );
+            }
+        }
+    }
+    silk_memcpy( C_last_row, C_first_row, SILK_MAX_ORDER_LPC * sizeof( opus_int32 ) );
+
+    /* Initialize */
+    CAb[ 0 ] = CAf[ 0 ] = C0 + silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ) + 1;                                /* Q(-rshifts) */
+
+    invGain_Q30 = (opus_int32)1 << 30;
+    reached_max_gain = 0;
+    for( n = 0; n < D; n++ ) {
+        /* Update first row of correlation matrix (without first element) */
+        /* Update last row of correlation matrix (without last element, stored in reversed order) */
+        /* Update C * Af */
+        /* Update C * flipud(Af) (stored in reversed order) */
+        if( rshifts > -2 ) {
+            for( s = 0; s < nb_subfr; s++ ) {
+                x_ptr = x + s * subfr_length;
+                x1  = -silk_LSHIFT32( (opus_int32)x_ptr[ n ],                    16 - rshifts );        /* Q(16-rshifts) */
+                x2  = -silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], 16 - rshifts );        /* Q(16-rshifts) */
+                tmp1 = silk_LSHIFT32( (opus_int32)x_ptr[ n ],                    QA - 16 );             /* Q(QA-16) */
+                tmp2 = silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], QA - 16 );             /* Q(QA-16) */
+                for( k = 0; k < n; k++ ) {
+                    C_first_row[ k ] = silk_SMLAWB( C_first_row[ k ], x1, x_ptr[ n - k - 1 ]            ); /* Q( -rshifts ) */
+                    C_last_row[ k ]  = silk_SMLAWB( C_last_row[ k ],  x2, x_ptr[ subfr_length - n + k ] ); /* Q( -rshifts ) */
+                    Atmp_QA = Af_QA[ k ];
+                    tmp1 = silk_SMLAWB( tmp1, Atmp_QA, x_ptr[ n - k - 1 ]            );                 /* Q(QA-16) */
+                    tmp2 = silk_SMLAWB( tmp2, Atmp_QA, x_ptr[ subfr_length - n + k ] );                 /* Q(QA-16) */
+                }
+                tmp1 = silk_LSHIFT32( -tmp1, 32 - QA - rshifts );                                       /* Q(16-rshifts) */
+                tmp2 = silk_LSHIFT32( -tmp2, 32 - QA - rshifts );                                       /* Q(16-rshifts) */
+                for( k = 0; k <= n; k++ ) {
+                    CAf[ k ] = silk_SMLAWB( CAf[ k ], tmp1, x_ptr[ n - k ]                    );        /* Q( -rshift ) */
+                    CAb[ k ] = silk_SMLAWB( CAb[ k ], tmp2, x_ptr[ subfr_length - n + k - 1 ] );        /* Q( -rshift ) */
+                }
+            }
+        } else {
+            for( s = 0; s < nb_subfr; s++ ) {
+                x_ptr = x + s * subfr_length;
+                x1  = -silk_LSHIFT32( (opus_int32)x_ptr[ n ],                    -rshifts );            /* Q( -rshifts ) */
+                x2  = -silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], -rshifts );            /* Q( -rshifts ) */
+                tmp1 = silk_LSHIFT32( (opus_int32)x_ptr[ n ],                    17 );                  /* Q17 */
+                tmp2 = silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], 17 );                  /* Q17 */
+                for( k = 0; k < n; k++ ) {
+                    C_first_row[ k ] = silk_MLA( C_first_row[ k ], x1, x_ptr[ n - k - 1 ]            ); /* Q( -rshifts ) */
+                    C_last_row[ k ]  = silk_MLA( C_last_row[ k ],  x2, x_ptr[ subfr_length - n + k ] ); /* Q( -rshifts ) */
+                    Atmp1 = silk_RSHIFT_ROUND( Af_QA[ k ], QA - 17 );                                   /* Q17 */
+                    tmp1 = silk_MLA( tmp1, x_ptr[ n - k - 1 ],            Atmp1 );                      /* Q17 */
+                    tmp2 = silk_MLA( tmp2, x_ptr[ subfr_length - n + k ], Atmp1 );                      /* Q17 */
+                }
+                tmp1 = -tmp1;                                                                           /* Q17 */
+                tmp2 = -tmp2;                                                                           /* Q17 */
+                for( k = 0; k <= n; k++ ) {
+                    CAf[ k ] = silk_SMLAWW( CAf[ k ], tmp1,
+                        silk_LSHIFT32( (opus_int32)x_ptr[ n - k ], -rshifts - 1 ) );                    /* Q( -rshift ) */
+                    CAb[ k ] = silk_SMLAWW( CAb[ k ], tmp2,
+                        silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n + k - 1 ], -rshifts - 1 ) ); /* Q( -rshift ) */
+                }
+            }
+        }
+
+        /* Calculate nominator and denominator for the next order reflection (parcor) coefficient */
+        tmp1 = C_first_row[ n ];                                                                        /* Q( -rshifts ) */
+        tmp2 = C_last_row[ n ];                                                                         /* Q( -rshifts ) */
+        num  = 0;                                                                                       /* Q( -rshifts ) */
+        nrg  = silk_ADD32( CAb[ 0 ], CAf[ 0 ] );                                                        /* Q( 1-rshifts ) */
+        for( k = 0; k < n; k++ ) {
+            Atmp_QA = Af_QA[ k ];
+            lz = silk_CLZ32( silk_abs( Atmp_QA ) ) - 1;
+            lz = silk_min( 32 - QA, lz );
+            Atmp1 = silk_LSHIFT32( Atmp_QA, lz );                                                       /* Q( QA + lz ) */
+
+            tmp1 = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( C_last_row[  n - k - 1 ], Atmp1 ), 32 - QA - lz );  /* Q( -rshifts ) */
+            tmp2 = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( C_first_row[ n - k - 1 ], Atmp1 ), 32 - QA - lz );  /* Q( -rshifts ) */
+            num  = silk_ADD_LSHIFT32( num,  silk_SMMUL( CAb[ n - k ],             Atmp1 ), 32 - QA - lz );  /* Q( -rshifts ) */
+            nrg  = silk_ADD_LSHIFT32( nrg,  silk_SMMUL( silk_ADD32( CAb[ k + 1 ], CAf[ k + 1 ] ),
+                                                                                Atmp1 ), 32 - QA - lz );    /* Q( 1-rshifts ) */
+        }
+        CAf[ n + 1 ] = tmp1;                                                                            /* Q( -rshifts ) */
+        CAb[ n + 1 ] = tmp2;                                                                            /* Q( -rshifts ) */
+        num = silk_ADD32( num, tmp2 );                                                                  /* Q( -rshifts ) */
+        num = silk_LSHIFT32( -num, 1 );                                                                 /* Q( 1-rshifts ) */
+
+        /* Calculate the next order reflection (parcor) coefficient */
+        if( silk_abs( num ) < nrg ) {
+            rc_Q31 = silk_DIV32_varQ( num, nrg, 31 );
+        } else {
+            rc_Q31 = ( num > 0 ) ? silk_int32_MAX : silk_int32_MIN;
+        }
+
+        /* Update inverse prediction gain */
+        tmp1 = ( (opus_int32)1 << 30 ) - silk_SMMUL( rc_Q31, rc_Q31 );
+        tmp1 = silk_LSHIFT( silk_SMMUL( invGain_Q30, tmp1 ), 2 );
+        if( tmp1 <= minInvGain_Q30 ) {
+            /* Max prediction gain exceeded; set reflection coefficient such that max prediction gain is exactly hit */
+            tmp2 = ( (opus_int32)1 << 30 ) - silk_DIV32_varQ( minInvGain_Q30, invGain_Q30, 30 );            /* Q30 */
+            rc_Q31 = silk_SQRT_APPROX( tmp2 );                                                  /* Q15 */
+            /* Newton-Raphson iteration */
+            rc_Q31 = silk_RSHIFT32( rc_Q31 + silk_DIV32( tmp2, rc_Q31 ), 1 );                   /* Q15 */
+            rc_Q31 = silk_LSHIFT32( rc_Q31, 16 );                                               /* Q31 */
+            if( num < 0 ) {
+                /* Ensure adjusted reflection coefficients has the original sign */
+                rc_Q31 = -rc_Q31;
+            }
+            invGain_Q30 = minInvGain_Q30;
+            reached_max_gain = 1;
+        } else {
+            invGain_Q30 = tmp1;
+        }
+
+        /* Update the AR coefficients */
+        for( k = 0; k < (n + 1) >> 1; k++ ) {
+            tmp1 = Af_QA[ k ];                                                                  /* QA */
+            tmp2 = Af_QA[ n - k - 1 ];                                                          /* QA */
+            Af_QA[ k ]         = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( tmp2, rc_Q31 ), 1 );      /* QA */
+            Af_QA[ n - k - 1 ] = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( tmp1, rc_Q31 ), 1 );      /* QA */
+        }
+        Af_QA[ n ] = silk_RSHIFT32( rc_Q31, 31 - QA );                                          /* QA */
+
+        if( reached_max_gain ) {
+            /* Reached max prediction gain; set remaining coefficients to zero and exit loop */
+            for( k = n + 1; k < D; k++ ) {
+                Af_QA[ k ] = 0;
+            }
+            break;
+        }
+
+        /* Update C * Af and C * Ab */
+        for( k = 0; k <= n + 1; k++ ) {
+            tmp1 = CAf[ k ];                                                                    /* Q( -rshifts ) */
+            tmp2 = CAb[ n - k + 1 ];                                                            /* Q( -rshifts ) */
+            CAf[ k ]         = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( tmp2, rc_Q31 ), 1 );        /* Q( -rshifts ) */
+            CAb[ n - k + 1 ] = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( tmp1, rc_Q31 ), 1 );        /* Q( -rshifts ) */
+        }
+    }
+
+    if( reached_max_gain ) {
+        for( k = 0; k < D; k++ ) {
+            /* Scale coefficients */
+            A_Q16[ k ] = -silk_RSHIFT_ROUND( Af_QA[ k ], QA - 16 );
+        }
+        /* Subtract energy of preceding samples from C0 */
+        if( rshifts > 0 ) {
+            for( s = 0; s < nb_subfr; s++ ) {
+                x_ptr = x + s * subfr_length;
+                C0 -= (opus_int32)silk_RSHIFT64( silk_inner_prod16_aligned_64( x_ptr, x_ptr, D ), rshifts );
+            }
+        } else {
+            for( s = 0; s < nb_subfr; s++ ) {
+                x_ptr = x + s * subfr_length;
+                C0 -= silk_LSHIFT32( silk_inner_prod_aligned( x_ptr, x_ptr, D ), -rshifts );
+            }
+        }
+        /* Approximate residual energy */
+        *res_nrg = silk_LSHIFT( silk_SMMUL( invGain_Q30, C0 ), 2 );
+        *res_nrg_Q = -rshifts;
+    } else {
+        /* Return residual energy */
+        nrg  = CAf[ 0 ];                                                                            /* Q( -rshifts ) */
+        tmp1 = (opus_int32)1 << 16;                                                                             /* Q16 */
+        for( k = 0; k < D; k++ ) {
+            Atmp1 = silk_RSHIFT_ROUND( Af_QA[ k ], QA - 16 );                                       /* Q16 */
+            nrg  = silk_SMLAWW( nrg, CAf[ k + 1 ], Atmp1 );                                         /* Q( -rshifts ) */
+            tmp1 = silk_SMLAWW( tmp1, Atmp1, Atmp1 );                                               /* Q16 */
+            A_Q16[ k ] = -Atmp1;
+        }
+        *res_nrg = silk_SMLAWW( nrg, silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ), -tmp1 );/* Q( -rshifts ) */
+        *res_nrg_Q = -rshifts;
+    }
+}
diff --git a/drivers/opus/silk/fixed/corrMatrix_FIX.c b/drivers/opus/silk/fixed/corrMatrix_FIX.c
new file mode 100644
index 0000000000..28543fc204
--- /dev/null
+++ b/drivers/opus/silk/fixed/corrMatrix_FIX.c
@@ -0,0 +1,156 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/**********************************************************************
+ * Correlation Matrix Computations for LS estimate.
+ **********************************************************************/
+
+#include "main_FIX.h"
+
+/* Calculates correlation vector X'*t */
+void silk_corrVector_FIX(
+    const opus_int16                *x,                                     /* I    x vector [L + order - 1] used to form data matrix X                         */
+    const opus_int16                *t,                                     /* I    Target vector [L]                                                           */
+    const opus_int                  L,                                      /* I    Length of vectors                                                           */
+    const opus_int                  order,                                  /* I    Max lag for correlation                                                     */
+    opus_int32                      *Xt,                                    /* O    Pointer to X'*t correlation vector [order]                                  */
+    const opus_int                  rshifts                                 /* I    Right shifts of correlations                                                */
+)
+{
+    opus_int         lag, i;
+    const opus_int16 *ptr1, *ptr2;
+    opus_int32       inner_prod;
+
+    ptr1 = &x[ order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */
+    ptr2 = t;
+    /* Calculate X'*t */
+    if( rshifts > 0 ) {
+        /* Right shifting used */
+        for( lag = 0; lag < order; lag++ ) {
+            inner_prod = 0;
+            for( i = 0; i < L; i++ ) {
+                inner_prod += silk_RSHIFT32( silk_SMULBB( ptr1[ i ], ptr2[i] ), rshifts );
+            }
+            Xt[ lag ] = inner_prod; /* X[:,lag]'*t */
+            ptr1--; /* Go to next column of X */
+        }
+    } else {
+        silk_assert( rshifts == 0 );
+        for( lag = 0; lag < order; lag++ ) {
+            Xt[ lag ] = silk_inner_prod_aligned( ptr1, ptr2, L ); /* X[:,lag]'*t */
+            ptr1--; /* Go to next column of X */
+        }
+    }
+}
+
+/* Calculates correlation matrix X'*X */
+void silk_corrMatrix_FIX(
+    const opus_int16                *x,                                     /* I    x vector [L + order - 1] used to form data matrix X                         */
+    const opus_int                  L,                                      /* I    Length of vectors                                                           */
+    const opus_int                  order,                                  /* I    Max lag for correlation                                                     */
+    const opus_int                  head_room,                              /* I    Desired headroom                                                            */
+    opus_int32                      *XX,                                    /* O    Pointer to X'*X correlation matrix [ order x order ]                        */
+    opus_int                        *rshifts                                /* I/O  Right shifts of correlations                                                */
+)
+{
+    opus_int         i, j, lag, rshifts_local, head_room_rshifts;
+    opus_int32       energy;
+    const opus_int16 *ptr1, *ptr2;
+
+    /* Calculate energy to find shift used to fit in 32 bits */
+    silk_sum_sqr_shift( &energy, &rshifts_local, x, L + order - 1 );
+    /* Add shifts to get the desired head room */
+    head_room_rshifts = silk_max( head_room - silk_CLZ32( energy ), 0 );
+
+    energy = silk_RSHIFT32( energy, head_room_rshifts );
+    rshifts_local += head_room_rshifts;
+
+    /* Calculate energy of first column (0) of X: X[:,0]'*X[:,0] */
+    /* Remove contribution of first order - 1 samples */
+    for( i = 0; i < order - 1; i++ ) {
+        energy -= silk_RSHIFT32( silk_SMULBB( x[ i ], x[ i ] ), rshifts_local );
+    }
+    if( rshifts_local < *rshifts ) {
+        /* Adjust energy */
+        energy = silk_RSHIFT32( energy, *rshifts - rshifts_local );
+        rshifts_local = *rshifts;
+    }
+
+    /* Calculate energy of remaining columns of X: X[:,j]'*X[:,j] */
+    /* Fill out the diagonal of the correlation matrix */
+    matrix_ptr( XX, 0, 0, order ) = energy;
+    ptr1 = &x[ order - 1 ]; /* First sample of column 0 of X */
+    for( j = 1; j < order; j++ ) {
+        energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr1[ L - j ] ), rshifts_local ) );
+        energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr1[ -j ] ), rshifts_local ) );
+        matrix_ptr( XX, j, j, order ) = energy;
+    }
+
+    ptr2 = &x[ order - 2 ]; /* First sample of column 1 of X */
+    /* Calculate the remaining elements of the correlation matrix */
+    if( rshifts_local > 0 ) {
+        /* Right shifting used */
+        for( lag = 1; lag < order; lag++ ) {
+            /* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */
+            energy = 0;
+            for( i = 0; i < L; i++ ) {
+                energy += silk_RSHIFT32( silk_SMULBB( ptr1[ i ], ptr2[i] ), rshifts_local );
+            }
+            /* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */
+            matrix_ptr( XX, lag, 0, order ) = energy;
+            matrix_ptr( XX, 0, lag, order ) = energy;
+            for( j = 1; j < ( order - lag ); j++ ) {
+                energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ), rshifts_local ) );
+                energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr2[ -j ] ), rshifts_local ) );
+                matrix_ptr( XX, lag + j, j, order ) = energy;
+                matrix_ptr( XX, j, lag + j, order ) = energy;
+            }
+            ptr2--; /* Update pointer to first sample of next column (lag) in X */
+        }
+    } else {
+        for( lag = 1; lag < order; lag++ ) {
+            /* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */
+            energy = silk_inner_prod_aligned( ptr1, ptr2, L );
+            matrix_ptr( XX, lag, 0, order ) = energy;
+            matrix_ptr( XX, 0, lag, order ) = energy;
+            /* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */
+            for( j = 1; j < ( order - lag ); j++ ) {
+                energy = silk_SUB32( energy, silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ) );
+                energy = silk_SMLABB( energy, ptr1[ -j ], ptr2[ -j ] );
+                matrix_ptr( XX, lag + j, j, order ) = energy;
+                matrix_ptr( XX, j, lag + j, order ) = energy;
+            }
+            ptr2--;/* Update pointer to first sample of next column (lag) in X */
+        }
+    }
+    *rshifts = rshifts_local;
+}
+
diff --git a/drivers/opus/silk/fixed/encode_frame_FIX.c b/drivers/opus/silk/fixed/encode_frame_FIX.c
new file mode 100644
index 0000000000..2d80ca3583
--- /dev/null
+++ b/drivers/opus/silk/fixed/encode_frame_FIX.c
@@ -0,0 +1,385 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+
+/* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate           */
+static OPUS_INLINE void silk_LBRR_encode_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Pointer to Silk FIX encoder control struct                                  */
+    const opus_int32                xfw_Q3[],                               /* I    Input signal                                                                */
+    opus_int                        condCoding                              /* I    The type of conditional coding used so far for this frame                   */
+);
+
+void silk_encode_do_VAD_FIX(
+    silk_encoder_state_FIX          *psEnc                                  /* I/O  Pointer to Silk FIX encoder state                                           */
+)
+{
+    /****************************/
+    /* Voice Activity Detection */
+    /****************************/
+    silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1 );
+
+    /**************************************************/
+    /* Convert speech activity into VAD and DTX flags */
+    /**************************************************/
+    if( psEnc->sCmn.speech_activity_Q8 < SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) {
+        psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
+        psEnc->sCmn.noSpeechCounter++;
+        if( psEnc->sCmn.noSpeechCounter < NB_SPEECH_FRAMES_BEFORE_DTX ) {
+            psEnc->sCmn.inDTX = 0;
+        } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
+            psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
+            psEnc->sCmn.inDTX           = 0;
+        }
+        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0;
+    } else {
+        psEnc->sCmn.noSpeechCounter    = 0;
+        psEnc->sCmn.inDTX              = 0;
+        psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
+        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
+    }
+}
+
+/****************/
+/* Encode frame */
+/****************/
+opus_int silk_encode_frame_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
+    opus_int32                      *pnBytesOut,                            /* O    Pointer to number of payload bytes;                                         */
+    ec_enc                          *psRangeEnc,                            /* I/O  compressor data structure                                                   */
+    opus_int                        condCoding,                             /* I    The type of conditional coding to use                                       */
+    opus_int                        maxBits,                                /* I    If > 0: maximum number of output bits                                       */
+    opus_int                        useCBR                                  /* I    Flag to force constant-bitrate operation                                    */
+)
+{
+    silk_encoder_control_FIX sEncCtrl;
+    opus_int     i, iter, maxIter, found_upper, found_lower, ret = 0;
+    opus_int16   *x_frame;
+    ec_enc       sRangeEnc_copy, sRangeEnc_copy2;
+    silk_nsq_state sNSQ_copy, sNSQ_copy2;
+    opus_int32   seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper;
+    opus_int32   gainsID, gainsID_lower, gainsID_upper;
+    opus_int16   gainMult_Q8;
+    opus_int16   ec_prevLagIndex_copy;
+    opus_int     ec_prevSignalType_copy;
+    opus_int8    LastGainIndex_copy2;
+    SAVE_STACK;
+
+    /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */
+    LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0;
+
+    psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;
+
+    /**************************************************************/
+    /* Set up Input Pointers, and insert frame in input buffer   */
+    /*************************************************************/
+    /* start of frame to encode */
+    x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length;
+
+    /***************************************/
+    /* Ensure smooth bandwidth transitions */
+    /***************************************/
+    silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
+
+    /*******************************************/
+    /* Copy new frame to front of input buffer */
+    /*******************************************/
+    silk_memcpy( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length * sizeof( opus_int16 ) );
+
+    if( !psEnc->sCmn.prefillFlag ) {
+        VARDECL( opus_int32, xfw_Q3 );
+        VARDECL( opus_int16, res_pitch );
+        VARDECL( opus_uint8, ec_buf_copy );
+        opus_int16 *res_pitch_frame;
+
+        ALLOC( res_pitch,
+               psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length
+                   + psEnc->sCmn.ltp_mem_length, opus_int16 );
+        /* start of pitch LPC residual frame */
+        res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length;
+
+        /*****************************************/
+        /* Find pitch lags, initial LPC analysis */
+        /*****************************************/
+        silk_find_pitch_lags_FIX( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch );
+
+        /************************/
+        /* Noise shape analysis */
+        /************************/
+        silk_noise_shape_analysis_FIX( psEnc, &sEncCtrl, res_pitch_frame, x_frame, psEnc->sCmn.arch );
+
+        /***************************************************/
+        /* Find linear prediction coefficients (LPC + LTP) */
+        /***************************************************/
+        silk_find_pred_coefs_FIX( psEnc, &sEncCtrl, res_pitch, x_frame, condCoding );
+
+        /****************************************/
+        /* Process gains                        */
+        /****************************************/
+        silk_process_gains_FIX( psEnc, &sEncCtrl, condCoding );
+
+        /*****************************************/
+        /* Prefiltering for noise shaper         */
+        /*****************************************/
+        ALLOC( xfw_Q3, psEnc->sCmn.frame_length, opus_int32 );
+        silk_prefilter_FIX( psEnc, &sEncCtrl, xfw_Q3, x_frame );
+
+        /****************************************/
+        /* Low Bitrate Redundant Encoding       */
+        /****************************************/
+        silk_LBRR_encode_FIX( psEnc, &sEncCtrl, xfw_Q3, condCoding );
+
+        /* Loop over quantizer and entropy coding to control bitrate */
+        maxIter = 6;
+        gainMult_Q8 = SILK_FIX_CONST( 1, 8 );
+        found_lower = 0;
+        found_upper = 0;
+        gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
+        gainsID_lower = -1;
+        gainsID_upper = -1;
+        /* Copy part of the input state */
+        silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) );
+        silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+        seed_copy = psEnc->sCmn.indices.Seed;
+        ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex;
+        ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType;
+        ALLOC( ec_buf_copy, 1275, opus_uint8 );
+        for( iter = 0; ; iter++ ) {
+            if( gainsID == gainsID_lower ) {
+                nBits = nBits_lower;
+            } else if( gainsID == gainsID_upper ) {
+                nBits = nBits_upper;
+            } else {
+                /* Restore part of the input state */
+                if( iter > 0 ) {
+                    silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) );
+                    silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) );
+                    psEnc->sCmn.indices.Seed = seed_copy;
+                    psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
+                    psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
+                }
+
+                /*****************************************/
+                /* Noise shaping quantization            */
+                /*****************************************/
+                if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
+                    silk_NSQ_del_dec( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw_Q3, psEnc->sCmn.pulses,
+                           sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
+                           sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
+                } else {
+                    silk_NSQ( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw_Q3, psEnc->sCmn.pulses,
+                            sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
+                            sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
+                }
+
+                /****************************************/
+                /* Encode Parameters                    */
+                /****************************************/
+                silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );
+
+                /****************************************/
+                /* Encode Excitation Signal             */
+                /****************************************/
+                silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
+                    psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
+
+                nBits = ec_tell( psRangeEnc );
+
+                if( useCBR == 0 && iter == 0 && nBits <= maxBits ) {
+                    break;
+                }
+            }
+
+            if( iter == maxIter ) {
+                if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) {
+                    /* Restore output state from earlier iteration that did meet the bitrate budget */
+                    silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
+                    silk_assert( sRangeEnc_copy2.offs <= 1275 );
+                    silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs );
+                    silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) );
+                    psEnc->sShape.LastGainIndex = LastGainIndex_copy2;
+                }
+                break;
+            }
+
+            if( nBits > maxBits ) {
+                if( found_lower == 0 && iter >= 2 ) {
+                    /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */
+                    sEncCtrl.Lambda_Q10 = silk_ADD_RSHIFT32( sEncCtrl.Lambda_Q10, sEncCtrl.Lambda_Q10, 1 );
+                    found_upper = 0;
+                    gainsID_upper = -1;
+                } else {
+                    found_upper = 1;
+                    nBits_upper = nBits;
+                    gainMult_upper = gainMult_Q8;
+                    gainsID_upper = gainsID;
+                }
+            } else if( nBits < maxBits - 5 ) {
+                found_lower = 1;
+                nBits_lower = nBits;
+                gainMult_lower = gainMult_Q8;
+                if( gainsID != gainsID_lower ) {
+                    gainsID_lower = gainsID;
+                    /* Copy part of the output state */
+                    silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
+                    silk_assert( psRangeEnc->offs <= 1275 );
+                    silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs );
+                    silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+                    LastGainIndex_copy2 = psEnc->sShape.LastGainIndex;
+                }
+            } else {
+                /* Within 5 bits of budget: close enough */
+                break;
+            }
+
+            if( ( found_lower & found_upper ) == 0 ) {
+                /* Adjust gain according to high-rate rate/distortion curve */
+                opus_int32 gain_factor_Q16;
+                gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) );
+                gain_factor_Q16 = silk_min_32( gain_factor_Q16, SILK_FIX_CONST( 2, 16 ) );
+                if( nBits > maxBits ) {
+                    gain_factor_Q16 = silk_max_32( gain_factor_Q16, SILK_FIX_CONST( 1.3, 16 ) );
+                }
+                gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 );
+            } else {
+                /* Adjust gain by interpolating */
+                gainMult_Q8 = gainMult_lower + silk_DIV32_16( silk_MUL( gainMult_upper - gainMult_lower, maxBits - nBits_lower ), nBits_upper - nBits_lower );
+                /* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */
+                if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) {
+                    gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 );
+                } else
+                if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) {
+                    gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 );
+                }
+            }
+
+            for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+                sEncCtrl.Gains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], gainMult_Q8 ), 8 );
+            }
+ 
+            /* Quantize gains */
+            psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
+            silk_gains_quant( psEnc->sCmn.indices.GainsIndices, sEncCtrl.Gains_Q16,
+                  &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+            /* Unique identifier of gains vector */
+            gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
+        }
+    }
+
+    /* Update input buffer */
+    silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
+        ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( opus_int16 ) );
+
+    /* Exit without entropy coding */
+    if( psEnc->sCmn.prefillFlag ) {
+        /* No payload */
+        *pnBytesOut = 0;
+        RESTORE_STACK;
+        return ret;
+    }
+
+    /* Parameters needed for next frame */
+    psEnc->sCmn.prevLag        = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
+    psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;
+
+    /****************************************/
+    /* Finalize payload                     */
+    /****************************************/
+    psEnc->sCmn.first_frame_after_reset = 0;
+    /* Payload size */
+    *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
+
+    RESTORE_STACK;
+    return ret;
+}
+
+/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate  */
+static OPUS_INLINE void silk_LBRR_encode_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Pointer to Silk FIX encoder control struct                                  */
+    const opus_int32                xfw_Q3[],                               /* I    Input signal                                                                */
+    opus_int                        condCoding                              /* I    The type of conditional coding used so far for this frame                   */
+)
+{
+    opus_int32   TempGains_Q16[ MAX_NB_SUBFR ];
+    SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ];
+    silk_nsq_state sNSQ_LBRR;
+
+    /*******************************************/
+    /* Control use of inband LBRR              */
+    /*******************************************/
+    if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
+        psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
+
+        /* Copy noise shaping quantizer state and quantization indices from regular encoding */
+        silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+        silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
+
+        /* Save original gains */
+        silk_memcpy( TempGains_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
+
+        if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) {
+            /* First frame in packet or previous frame not LBRR coded */
+            psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;
+
+            /* Increase Gains to get target LBRR rate */
+            psIndices_LBRR->GainsIndices[ 0 ] = psIndices_LBRR->GainsIndices[ 0 ] + psEnc->sCmn.LBRR_GainIncreases;
+            psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
+        }
+
+        /* Decode to get gains in sync with decoder         */
+        /* Overwrite unquantized gains with quantized gains */
+        silk_gains_dequant( psEncCtrl->Gains_Q16, psIndices_LBRR->GainsIndices,
+            &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+        /*****************************************/
+        /* Noise shaping quantization            */
+        /*****************************************/
+        if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
+            silk_NSQ_del_dec( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw_Q3,
+                psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
+                psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
+                psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
+        } else {
+            silk_NSQ( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw_Q3,
+                psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
+                psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
+                psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
+        }
+
+        /* Restore original gains */
+        silk_memcpy( psEncCtrl->Gains_Q16, TempGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
+    }
+}
diff --git a/drivers/opus/silk/fixed/find_LPC_FIX.c b/drivers/opus/silk/fixed/find_LPC_FIX.c
new file mode 100644
index 0000000000..a46cdb7515
--- /dev/null
+++ b/drivers/opus/silk/fixed/find_LPC_FIX.c
@@ -0,0 +1,151 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+
+/* Finds LPC vector from correlations, and converts to NLSF */
+void silk_find_LPC_FIX(
+    silk_encoder_state              *psEncC,                                /* I/O  Encoder state                                                               */
+    opus_int16                      NLSF_Q15[],                             /* O    NLSFs                                                                       */
+    const opus_int16                x[],                                    /* I    Input signal                                                                */
+    const opus_int32                minInvGain_Q30                          /* I    Inverse of max prediction gain                                              */
+)
+{
+    opus_int     k, subfr_length;
+    opus_int32   a_Q16[ MAX_LPC_ORDER ];
+    opus_int     isInterpLower, shift;
+    opus_int32   res_nrg0, res_nrg1;
+    opus_int     rshift0, rshift1;
+
+    /* Used only for LSF interpolation */
+    opus_int32   a_tmp_Q16[ MAX_LPC_ORDER ], res_nrg_interp, res_nrg, res_tmp_nrg;
+    opus_int     res_nrg_interp_Q, res_nrg_Q, res_tmp_nrg_Q;
+    opus_int16   a_tmp_Q12[ MAX_LPC_ORDER ];
+    opus_int16   NLSF0_Q15[ MAX_LPC_ORDER ];
+    SAVE_STACK;
+
+    subfr_length = psEncC->subfr_length + psEncC->predictLPCOrder;
+
+    /* Default: no interpolation */
+    psEncC->indices.NLSFInterpCoef_Q2 = 4;
+
+    /* Burg AR analysis for the full frame */
+    silk_burg_modified( &res_nrg, &res_nrg_Q, a_Q16, x, minInvGain_Q30, subfr_length, psEncC->nb_subfr, psEncC->predictLPCOrder, psEncC->arch );
+
+    if( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) {
+        VARDECL( opus_int16, LPC_res );
+
+        /* Optimal solution for last 10 ms */
+        silk_burg_modified( &res_tmp_nrg, &res_tmp_nrg_Q, a_tmp_Q16, x + 2 * subfr_length, minInvGain_Q30, subfr_length, 2, psEncC->predictLPCOrder, psEncC->arch );
+
+        /* subtract residual energy here, as that's easier than adding it to the    */
+        /* residual energy of the first 10 ms in each iteration of the search below */
+        shift = res_tmp_nrg_Q - res_nrg_Q;
+        if( shift >= 0 ) {
+            if( shift < 32 ) {
+                res_nrg = res_nrg - silk_RSHIFT( res_tmp_nrg, shift );
+            }
+        } else {
+            silk_assert( shift > -32 );
+            res_nrg   = silk_RSHIFT( res_nrg, -shift ) - res_tmp_nrg;
+            res_nrg_Q = res_tmp_nrg_Q;
+        }
+
+        /* Convert to NLSFs */
+        silk_A2NLSF( NLSF_Q15, a_tmp_Q16, psEncC->predictLPCOrder );
+
+        ALLOC( LPC_res, 2 * subfr_length, opus_int16 );
+
+        /* Search over interpolation indices to find the one with lowest residual energy */
+        for( k = 3; k >= 0; k-- ) {
+            /* Interpolate NLSFs for first half */
+            silk_interpolate( NLSF0_Q15, psEncC->prev_NLSFq_Q15, NLSF_Q15, k, psEncC->predictLPCOrder );
+
+            /* Convert to LPC for residual energy evaluation */
+            silk_NLSF2A( a_tmp_Q12, NLSF0_Q15, psEncC->predictLPCOrder );
+
+            /* Calculate residual energy with NLSF interpolation */
+            silk_LPC_analysis_filter( LPC_res, x, a_tmp_Q12, 2 * subfr_length, psEncC->predictLPCOrder );
+
+            silk_sum_sqr_shift( &res_nrg0, &rshift0, LPC_res + psEncC->predictLPCOrder,                subfr_length - psEncC->predictLPCOrder );
+            silk_sum_sqr_shift( &res_nrg1, &rshift1, LPC_res + psEncC->predictLPCOrder + subfr_length, subfr_length - psEncC->predictLPCOrder );
+
+            /* Add subframe energies from first half frame */
+            shift = rshift0 - rshift1;
+            if( shift >= 0 ) {
+                res_nrg1         = silk_RSHIFT( res_nrg1, shift );
+                res_nrg_interp_Q = -rshift0;
+            } else {
+                res_nrg0         = silk_RSHIFT( res_nrg0, -shift );
+                res_nrg_interp_Q = -rshift1;
+            }
+            res_nrg_interp = silk_ADD32( res_nrg0, res_nrg1 );
+
+            /* Compare with first half energy without NLSF interpolation, or best interpolated value so far */
+            shift = res_nrg_interp_Q - res_nrg_Q;
+            if( shift >= 0 ) {
+                if( silk_RSHIFT( res_nrg_interp, shift ) < res_nrg ) {
+                    isInterpLower = silk_TRUE;
+                } else {
+                    isInterpLower = silk_FALSE;
+                }
+            } else {
+                if( -shift < 32 ) {
+                    if( res_nrg_interp < silk_RSHIFT( res_nrg, -shift ) ) {
+                        isInterpLower = silk_TRUE;
+                    } else {
+                        isInterpLower = silk_FALSE;
+                    }
+                } else {
+                    isInterpLower = silk_FALSE;
+                }
+            }
+
+            /* Determine whether current interpolated NLSFs are best so far */
+            if( isInterpLower == silk_TRUE ) {
+                /* Interpolation has lower residual energy */
+                res_nrg   = res_nrg_interp;
+                res_nrg_Q = res_nrg_interp_Q;
+                psEncC->indices.NLSFInterpCoef_Q2 = (opus_int8)k;
+            }
+        }
+    }
+
+    if( psEncC->indices.NLSFInterpCoef_Q2 == 4 ) {
+        /* NLSF interpolation is currently inactive, calculate NLSFs from full frame AR coefficients */
+        silk_A2NLSF( NLSF_Q15, a_Q16, psEncC->predictLPCOrder );
+    }
+
+    silk_assert( psEncC->indices.NLSFInterpCoef_Q2 == 4 || ( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) );
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/fixed/find_LTP_FIX.c b/drivers/opus/silk/fixed/find_LTP_FIX.c
new file mode 100644
index 0000000000..a1d152eee4
--- /dev/null
+++ b/drivers/opus/silk/fixed/find_LTP_FIX.c
@@ -0,0 +1,244 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "tuning_parameters.h"
+
+/* Head room for correlations */
+#define LTP_CORRS_HEAD_ROOM                             2
+
+void silk_fit_LTP(
+    opus_int32 LTP_coefs_Q16[ LTP_ORDER ],
+    opus_int16 LTP_coefs_Q14[ LTP_ORDER ]
+);
+
+void silk_find_LTP_FIX(
+    opus_int16                      b_Q14[ MAX_NB_SUBFR * LTP_ORDER ],      /* O    LTP coefs                                                                   */
+    opus_int32                      WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization                                           */
+    opus_int                        *LTPredCodGain_Q7,                      /* O    LTP coding gain                                                             */
+    const opus_int16                r_lpc[],                                /* I    residual signal after LPC signal + state for first 10 ms                    */
+    const opus_int                  lag[ MAX_NB_SUBFR ],                    /* I    LTP lags                                                                    */
+    const opus_int32                Wght_Q15[ MAX_NB_SUBFR ],               /* I    weights                                                                     */
+    const opus_int                  subfr_length,                           /* I    subframe length                                                             */
+    const opus_int                  nb_subfr,                               /* I    number of subframes                                                         */
+    const opus_int                  mem_offset,                             /* I    number of samples in LTP memory                                             */
+    opus_int                        corr_rshifts[ MAX_NB_SUBFR ]            /* O    right shifts applied to correlations                                        */
+)
+{
+    opus_int   i, k, lshift;
+    const opus_int16 *r_ptr, *lag_ptr;
+    opus_int16 *b_Q14_ptr;
+
+    opus_int32 regu;
+    opus_int32 *WLTP_ptr;
+    opus_int32 b_Q16[ LTP_ORDER ], delta_b_Q14[ LTP_ORDER ], d_Q14[ MAX_NB_SUBFR ], nrg[ MAX_NB_SUBFR ], g_Q26;
+    opus_int32 w[ MAX_NB_SUBFR ], WLTP_max, max_abs_d_Q14, max_w_bits;
+
+    opus_int32 temp32, denom32;
+    opus_int   extra_shifts;
+    opus_int   rr_shifts, maxRshifts, maxRshifts_wxtra, LZs;
+    opus_int32 LPC_res_nrg, LPC_LTP_res_nrg, div_Q16;
+    opus_int32 Rr[ LTP_ORDER ], rr[ MAX_NB_SUBFR ];
+    opus_int32 wd, m_Q12;
+
+    b_Q14_ptr = b_Q14;
+    WLTP_ptr  = WLTP;
+    r_ptr     = &r_lpc[ mem_offset ];
+    for( k = 0; k < nb_subfr; k++ ) {
+        lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
+
+        silk_sum_sqr_shift( &rr[ k ], &rr_shifts, r_ptr, subfr_length ); /* rr[ k ] in Q( -rr_shifts ) */
+
+        /* Assure headroom */
+        LZs = silk_CLZ32( rr[k] );
+        if( LZs < LTP_CORRS_HEAD_ROOM ) {
+            rr[ k ] = silk_RSHIFT_ROUND( rr[ k ], LTP_CORRS_HEAD_ROOM - LZs );
+            rr_shifts += ( LTP_CORRS_HEAD_ROOM - LZs );
+        }
+        corr_rshifts[ k ] = rr_shifts;
+        silk_corrMatrix_FIX( lag_ptr, subfr_length, LTP_ORDER, LTP_CORRS_HEAD_ROOM, WLTP_ptr, &corr_rshifts[ k ] );  /* WLTP_fix_ptr in Q( -corr_rshifts[ k ] ) */
+
+        /* The correlation vector always has lower max abs value than rr and/or RR so head room is assured */
+        silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, Rr, corr_rshifts[ k ] );  /* Rr_fix_ptr   in Q( -corr_rshifts[ k ] ) */
+        if( corr_rshifts[ k ] > rr_shifts ) {
+            rr[ k ] = silk_RSHIFT( rr[ k ], corr_rshifts[ k ] - rr_shifts ); /* rr[ k ] in Q( -corr_rshifts[ k ] ) */
+        }
+        silk_assert( rr[ k ] >= 0 );
+
+        regu = 1;
+        regu = silk_SMLAWB( regu, rr[ k ], SILK_FIX_CONST( LTP_DAMPING/3, 16 ) );
+        regu = silk_SMLAWB( regu, matrix_ptr( WLTP_ptr, 0, 0, LTP_ORDER ), SILK_FIX_CONST( LTP_DAMPING/3, 16 ) );
+        regu = silk_SMLAWB( regu, matrix_ptr( WLTP_ptr, LTP_ORDER-1, LTP_ORDER-1, LTP_ORDER ), SILK_FIX_CONST( LTP_DAMPING/3, 16 ) );
+        silk_regularize_correlations_FIX( WLTP_ptr, &rr[k], regu, LTP_ORDER );
+
+        silk_solve_LDL_FIX( WLTP_ptr, LTP_ORDER, Rr, b_Q16 ); /* WLTP_fix_ptr and Rr_fix_ptr both in Q(-corr_rshifts[k]) */
+
+        /* Limit and store in Q14 */
+        silk_fit_LTP( b_Q16, b_Q14_ptr );
+
+        /* Calculate residual energy */
+        nrg[ k ] = silk_residual_energy16_covar_FIX( b_Q14_ptr, WLTP_ptr, Rr, rr[ k ], LTP_ORDER, 14 ); /* nrg_fix in Q( -corr_rshifts[ k ] ) */
+
+        /* temp = Wght[ k ] / ( nrg[ k ] * Wght[ k ] + 0.01f * subfr_length ); */
+        extra_shifts = silk_min_int( corr_rshifts[ k ], LTP_CORRS_HEAD_ROOM );
+        denom32 = silk_LSHIFT_SAT32( silk_SMULWB( nrg[ k ], Wght_Q15[ k ] ), 1 + extra_shifts ) + /* Q( -corr_rshifts[ k ] + extra_shifts ) */
+            silk_RSHIFT( silk_SMULWB( (opus_int32)subfr_length, 655 ), corr_rshifts[ k ] - extra_shifts );    /* Q( -corr_rshifts[ k ] + extra_shifts ) */
+        denom32 = silk_max( denom32, 1 );
+        silk_assert( ((opus_int64)Wght_Q15[ k ] << 16 ) < silk_int32_MAX );                       /* Wght always < 0.5 in Q0 */
+        temp32 = silk_DIV32( silk_LSHIFT( (opus_int32)Wght_Q15[ k ], 16 ), denom32 );             /* Q( 15 + 16 + corr_rshifts[k] - extra_shifts ) */
+        temp32 = silk_RSHIFT( temp32, 31 + corr_rshifts[ k ] - extra_shifts - 26 );               /* Q26 */
+
+        /* Limit temp such that the below scaling never wraps around */
+        WLTP_max = 0;
+        for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
+            WLTP_max = silk_max( WLTP_ptr[ i ], WLTP_max );
+        }
+        lshift = silk_CLZ32( WLTP_max ) - 1 - 3; /* keep 3 bits free for vq_nearest_neighbor_fix */
+        silk_assert( 26 - 18 + lshift >= 0 );
+        if( 26 - 18 + lshift < 31 ) {
+            temp32 = silk_min_32( temp32, silk_LSHIFT( (opus_int32)1, 26 - 18 + lshift ) );
+        }
+
+        silk_scale_vector32_Q26_lshift_18( WLTP_ptr, temp32, LTP_ORDER * LTP_ORDER ); /* WLTP_ptr in Q( 18 - corr_rshifts[ k ] ) */
+
+        w[ k ] = matrix_ptr( WLTP_ptr, LTP_ORDER/2, LTP_ORDER/2, LTP_ORDER ); /* w in Q( 18 - corr_rshifts[ k ] ) */
+        silk_assert( w[k] >= 0 );
+
+        r_ptr     += subfr_length;
+        b_Q14_ptr += LTP_ORDER;
+        WLTP_ptr  += LTP_ORDER * LTP_ORDER;
+    }
+
+    maxRshifts = 0;
+    for( k = 0; k < nb_subfr; k++ ) {
+        maxRshifts = silk_max_int( corr_rshifts[ k ], maxRshifts );
+    }
+
+    /* Compute LTP coding gain */
+    if( LTPredCodGain_Q7 != NULL ) {
+        LPC_LTP_res_nrg = 0;
+        LPC_res_nrg     = 0;
+        silk_assert( LTP_CORRS_HEAD_ROOM >= 2 ); /* Check that no overflow will happen when adding */
+        for( k = 0; k < nb_subfr; k++ ) {
+            LPC_res_nrg     = silk_ADD32( LPC_res_nrg,     silk_RSHIFT( silk_ADD32( silk_SMULWB(  rr[ k ], Wght_Q15[ k ] ), 1 ), 1 + ( maxRshifts - corr_rshifts[ k ] ) ) ); /* Q( -maxRshifts ) */
+            LPC_LTP_res_nrg = silk_ADD32( LPC_LTP_res_nrg, silk_RSHIFT( silk_ADD32( silk_SMULWB( nrg[ k ], Wght_Q15[ k ] ), 1 ), 1 + ( maxRshifts - corr_rshifts[ k ] ) ) ); /* Q( -maxRshifts ) */
+        }
+        LPC_LTP_res_nrg = silk_max( LPC_LTP_res_nrg, 1 ); /* avoid division by zero */
+
+        div_Q16 = silk_DIV32_varQ( LPC_res_nrg, LPC_LTP_res_nrg, 16 );
+        *LTPredCodGain_Q7 = ( opus_int )silk_SMULBB( 3, silk_lin2log( div_Q16 ) - ( 16 << 7 ) );
+
+        silk_assert( *LTPredCodGain_Q7 == ( opus_int )silk_SAT16( silk_MUL( 3, silk_lin2log( div_Q16 ) - ( 16 << 7 ) ) ) );
+    }
+
+    /* smoothing */
+    /* d = sum( B, 1 ); */
+    b_Q14_ptr = b_Q14;
+    for( k = 0; k < nb_subfr; k++ ) {
+        d_Q14[ k ] = 0;
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            d_Q14[ k ] += b_Q14_ptr[ i ];
+        }
+        b_Q14_ptr += LTP_ORDER;
+    }
+
+    /* m = ( w * d' ) / ( sum( w ) + 1e-3 ); */
+
+    /* Find maximum absolute value of d_Q14 and the bits used by w in Q0 */
+    max_abs_d_Q14 = 0;
+    max_w_bits    = 0;
+    for( k = 0; k < nb_subfr; k++ ) {
+        max_abs_d_Q14 = silk_max_32( max_abs_d_Q14, silk_abs( d_Q14[ k ] ) );
+        /* w[ k ] is in Q( 18 - corr_rshifts[ k ] ) */
+        /* Find bits needed in Q( 18 - maxRshifts ) */
+        max_w_bits = silk_max_32( max_w_bits, 32 - silk_CLZ32( w[ k ] ) + corr_rshifts[ k ] - maxRshifts );
+    }
+
+    /* max_abs_d_Q14 = (5 << 15); worst case, i.e. LTP_ORDER * -silk_int16_MIN */
+    silk_assert( max_abs_d_Q14 <= ( 5 << 15 ) );
+
+    /* How many bits is needed for w*d' in Q( 18 - maxRshifts ) in the worst case, of all d_Q14's being equal to max_abs_d_Q14 */
+    extra_shifts = max_w_bits + 32 - silk_CLZ32( max_abs_d_Q14 ) - 14;
+
+    /* Subtract what we got available; bits in output var plus maxRshifts */
+    extra_shifts -= ( 32 - 1 - 2 + maxRshifts ); /* Keep sign bit free as well as 2 bits for accumulation */
+    extra_shifts = silk_max_int( extra_shifts, 0 );
+
+    maxRshifts_wxtra = maxRshifts + extra_shifts;
+
+    temp32 = silk_RSHIFT( 262, maxRshifts + extra_shifts ) + 1; /* 1e-3f in Q( 18 - (maxRshifts + extra_shifts) ) */
+    wd = 0;
+    for( k = 0; k < nb_subfr; k++ ) {
+        /* w has at least 2 bits of headroom so no overflow should happen */
+        temp32 = silk_ADD32( temp32,                     silk_RSHIFT( w[ k ], maxRshifts_wxtra - corr_rshifts[ k ] ) );                      /* Q( 18 - maxRshifts_wxtra ) */
+        wd     = silk_ADD32( wd, silk_LSHIFT( silk_SMULWW( silk_RSHIFT( w[ k ], maxRshifts_wxtra - corr_rshifts[ k ] ), d_Q14[ k ] ), 2 ) ); /* Q( 18 - maxRshifts_wxtra ) */
+    }
+    m_Q12 = silk_DIV32_varQ( wd, temp32, 12 );
+
+    b_Q14_ptr = b_Q14;
+    for( k = 0; k < nb_subfr; k++ ) {
+        /* w_fix[ k ] from Q( 18 - corr_rshifts[ k ] ) to Q( 16 ) */
+        if( 2 - corr_rshifts[k] > 0 ) {
+            temp32 = silk_RSHIFT( w[ k ], 2 - corr_rshifts[ k ] );
+        } else {
+            temp32 = silk_LSHIFT_SAT32( w[ k ], corr_rshifts[ k ] - 2 );
+        }
+
+        g_Q26 = silk_MUL(
+            silk_DIV32(
+                SILK_FIX_CONST( LTP_SMOOTHING, 26 ),
+                silk_RSHIFT( SILK_FIX_CONST( LTP_SMOOTHING, 26 ), 10 ) + temp32 ),                          /* Q10 */
+            silk_LSHIFT_SAT32( silk_SUB_SAT32( (opus_int32)m_Q12, silk_RSHIFT( d_Q14[ k ], 2 ) ), 4 ) );    /* Q16 */
+
+        temp32 = 0;
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            delta_b_Q14[ i ] = silk_max_16( b_Q14_ptr[ i ], 1638 );     /* 1638_Q14 = 0.1_Q0 */
+            temp32 += delta_b_Q14[ i ];                                 /* Q14 */
+        }
+        temp32 = silk_DIV32( g_Q26, temp32 );                           /* Q14 -> Q12 */
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            b_Q14_ptr[ i ] = silk_LIMIT_32( (opus_int32)b_Q14_ptr[ i ] + silk_SMULWB( silk_LSHIFT_SAT32( temp32, 4 ), delta_b_Q14[ i ] ), -16000, 28000 );
+        }
+        b_Q14_ptr += LTP_ORDER;
+    }
+}
+
+void silk_fit_LTP(
+    opus_int32 LTP_coefs_Q16[ LTP_ORDER ],
+    opus_int16 LTP_coefs_Q14[ LTP_ORDER ]
+)
+{
+    opus_int i;
+
+    for( i = 0; i < LTP_ORDER; i++ ) {
+        LTP_coefs_Q14[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( LTP_coefs_Q16[ i ], 2 ) );
+    }
+}
diff --git a/drivers/opus/silk/fixed/find_pitch_lags_FIX.c b/drivers/opus/silk/fixed/find_pitch_lags_FIX.c
new file mode 100644
index 0000000000..0598477cd1
--- /dev/null
+++ b/drivers/opus/silk/fixed/find_pitch_lags_FIX.c
@@ -0,0 +1,145 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+
+/* Find pitch lags */
+void silk_find_pitch_lags_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
+    opus_int16                      res[],                                  /* O    residual                                                                    */
+    const opus_int16                x[],                                    /* I    Speech signal                                                               */
+    int                             arch                                    /* I    Run-time architecture                                                       */
+)
+{
+    opus_int   buf_len, i, scale;
+    opus_int32 thrhld_Q13, res_nrg;
+    const opus_int16 *x_buf, *x_buf_ptr;
+    VARDECL( opus_int16, Wsig );
+    opus_int16 *Wsig_ptr;
+    opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
+    opus_int16 rc_Q15[    MAX_FIND_PITCH_LPC_ORDER ];
+    opus_int32 A_Q24[     MAX_FIND_PITCH_LPC_ORDER ];
+    opus_int16 A_Q12[     MAX_FIND_PITCH_LPC_ORDER ];
+    SAVE_STACK;
+
+    /******************************************/
+    /* Set up buffer lengths etc based on Fs  */
+    /******************************************/
+    buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
+
+    /* Safety check */
+    silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
+
+    x_buf = x - psEnc->sCmn.ltp_mem_length;
+
+    /*************************************/
+    /* Estimate LPC AR coefficients      */
+    /*************************************/
+
+    /* Calculate windowed signal */
+
+    ALLOC( Wsig, psEnc->sCmn.pitch_LPC_win_length, opus_int16 );
+
+    /* First LA_LTP samples */
+    x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
+    Wsig_ptr  = Wsig;
+    silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
+
+    /* Middle un - windowed samples */
+    Wsig_ptr  += psEnc->sCmn.la_pitch;
+    x_buf_ptr += psEnc->sCmn.la_pitch;
+    silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) );
+
+    /* Last LA_LTP samples */
+    Wsig_ptr  += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
+    x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
+    silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
+
+    /* Calculate autocorrelation sequence */
+    silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1, arch );
+
+    /* Add white noise, as fraction of energy */
+    auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1;
+
+    /* Calculate the reflection coefficients using schur */
+    res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
+
+    /* Prediction gain */
+    psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 );
+
+    /* Convert reflection coefficients to prediction coefficients */
+    silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder );
+
+    /* Convert From 32 bit Q24 to 16 bit Q12 coefs */
+    for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) {
+        A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) );
+    }
+
+    /* Do BWE */
+    silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWIDTH_EXPANSION, 16 ) );
+
+    /*****************************************/
+    /* LPC analysis filtering                */
+    /*****************************************/
+    silk_LPC_analysis_filter( res, x_buf, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
+
+    if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
+        /* Threshold for pitch estimator */
+        thrhld_Q13 = SILK_FIX_CONST( 0.6, 13 );
+        thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.004, 13 ), psEnc->sCmn.pitchEstimationLPCOrder );
+        thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1,   21  ), psEnc->sCmn.speech_activity_Q8 );
+        thrhld_Q13 = silk_SMLABB( thrhld_Q13, SILK_FIX_CONST( -0.15,  13 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) );
+        thrhld_Q13 = silk_SMLAWB( thrhld_Q13, SILK_FIX_CONST( -0.1,   14 ), psEnc->sCmn.input_tilt_Q15 );
+        thrhld_Q13 = silk_SAT16(  thrhld_Q13 );
+
+        /*****************************************/
+        /* Call pitch estimator                  */
+        /*****************************************/
+        if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
+                &psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
+                (opus_int)thrhld_Q13, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr,
+                psEnc->sCmn.arch) == 0 )
+        {
+            psEnc->sCmn.indices.signalType = TYPE_VOICED;
+        } else {
+            psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
+        }
+    } else {
+        silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
+        psEnc->sCmn.indices.lagIndex = 0;
+        psEnc->sCmn.indices.contourIndex = 0;
+        psEnc->LTPCorr_Q15 = 0;
+    }
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/fixed/find_pred_coefs_FIX.c b/drivers/opus/silk/fixed/find_pred_coefs_FIX.c
new file mode 100644
index 0000000000..0ab70df09d
--- /dev/null
+++ b/drivers/opus/silk/fixed/find_pred_coefs_FIX.c
@@ -0,0 +1,147 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+
+void silk_find_pred_coefs_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
+    const opus_int16                res_pitch[],                            /* I    Residual from pitch analysis                                                */
+    const opus_int16                x[],                                    /* I    Speech signal                                                               */
+    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
+)
+{
+    opus_int         i;
+    opus_int32       invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ], Wght_Q15[ MAX_NB_SUBFR ];
+    opus_int16       NLSF_Q15[ MAX_LPC_ORDER ];
+    const opus_int16 *x_ptr;
+    opus_int16       *x_pre_ptr;
+    VARDECL( opus_int16, LPC_in_pre );
+    opus_int32       tmp, min_gain_Q16, minInvGain_Q30;
+    opus_int         LTP_corrs_rshift[ MAX_NB_SUBFR ];
+    SAVE_STACK;
+
+    /* weighting for weighted least squares */
+    min_gain_Q16 = silk_int32_MAX >> 6;
+    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+        min_gain_Q16 = silk_min( min_gain_Q16, psEncCtrl->Gains_Q16[ i ] );
+    }
+    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+        /* Divide to Q16 */
+        silk_assert( psEncCtrl->Gains_Q16[ i ] > 0 );
+        /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */
+        invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 );
+
+        /* Ensure Wght_Q15 a minimum value 1 */
+        invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 363 );
+
+        /* Square the inverted gains */
+        silk_assert( invGains_Q16[ i ] == silk_SAT16( invGains_Q16[ i ] ) );
+        tmp = silk_SMULWB( invGains_Q16[ i ], invGains_Q16[ i ] );
+        Wght_Q15[ i ] = silk_RSHIFT( tmp, 1 );
+
+        /* Invert the inverted and normalized gains */
+        local_gains[ i ] = silk_DIV32( ( (opus_int32)1 << 16 ), invGains_Q16[ i ] );
+    }
+
+    ALLOC( LPC_in_pre,
+           psEnc->sCmn.nb_subfr * psEnc->sCmn.predictLPCOrder
+               + psEnc->sCmn.frame_length, opus_int16 );
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        VARDECL( opus_int32, WLTP );
+
+        /**********/
+        /* VOICED */
+        /**********/
+        silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
+
+        ALLOC( WLTP, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 );
+
+        /* LTP analysis */
+        silk_find_LTP_FIX( psEncCtrl->LTPCoef_Q14, WLTP, &psEncCtrl->LTPredCodGain_Q7,
+            res_pitch, psEncCtrl->pitchL, Wght_Q15, psEnc->sCmn.subfr_length,
+            psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length, LTP_corrs_rshift );
+
+        /* Quantize LTP gain parameters */
+        silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
+            &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr);
+
+        /* Control LTP scaling */
+        silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding );
+
+        /* Create LTP residual */
+        silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14,
+            psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
+
+    } else {
+        /************/
+        /* UNVOICED */
+        /************/
+        /* Create signal with prepended subframes, scaled by inverse gains */
+        x_ptr     = x - psEnc->sCmn.predictLPCOrder;
+        x_pre_ptr = LPC_in_pre;
+        for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+            silk_scale_copy_vector16( x_pre_ptr, x_ptr, invGains_Q16[ i ],
+                psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
+            x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
+            x_ptr     += psEnc->sCmn.subfr_length;
+        }
+
+        silk_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) );
+        psEncCtrl->LTPredCodGain_Q7 = 0;
+		psEnc->sCmn.sum_log_gain_Q7 = 0;
+    }
+
+    /* Limit on total predictive coding gain */
+    if( psEnc->sCmn.first_frame_after_reset ) {
+        minInvGain_Q30 = SILK_FIX_CONST( 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET, 30 );
+    } else {        
+        minInvGain_Q30 = silk_log2lin( silk_SMLAWB( 16 << 7, (opus_int32)psEncCtrl->LTPredCodGain_Q7, SILK_FIX_CONST( 1.0 / 3, 16 ) ) );      /* Q16 */
+        minInvGain_Q30 = silk_DIV32_varQ( minInvGain_Q30, 
+            silk_SMULWW( SILK_FIX_CONST( MAX_PREDICTION_POWER_GAIN, 0 ), 
+                silk_SMLAWB( SILK_FIX_CONST( 0.25, 18 ), SILK_FIX_CONST( 0.75, 18 ), psEncCtrl->coding_quality_Q14 ) ), 14 );
+    }
+
+    /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
+    silk_find_LPC_FIX( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain_Q30 );
+
+    /* Quantize LSFs */
+    silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
+
+    /* Calculate residual energy using quantized LPC coefficients */
+    silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains,
+        psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
+
+    /* Copy to prediction struct for use in next frame for interpolation */
+    silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/fixed/k2a_FIX.c b/drivers/opus/silk/fixed/k2a_FIX.c
new file mode 100644
index 0000000000..848666ee3b
--- /dev/null
+++ b/drivers/opus/silk/fixed/k2a_FIX.c
@@ -0,0 +1,53 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Step up function, converts reflection coefficients to prediction coefficients */
+void silk_k2a(
+    opus_int32                  *A_Q24,             /* O    Prediction coefficients [order] Q24                         */
+    const opus_int16            *rc_Q15,            /* I    Reflection coefficients [order] Q15                         */
+    const opus_int32            order               /* I    Prediction order                                            */
+)
+{
+    opus_int   k, n;
+    opus_int32 Atmp[ SILK_MAX_ORDER_LPC ];
+
+    for( k = 0; k < order; k++ ) {
+        for( n = 0; n < k; n++ ) {
+            Atmp[ n ] = A_Q24[ n ];
+        }
+        for( n = 0; n < k; n++ ) {
+            A_Q24[ n ] = silk_SMLAWB( A_Q24[ n ], silk_LSHIFT( Atmp[ k - n - 1 ], 1 ), rc_Q15[ k ] );
+        }
+        A_Q24[ k ] = -silk_LSHIFT( (opus_int32)rc_Q15[ k ], 9 );
+    }
+}
diff --git a/drivers/opus/silk/fixed/k2a_Q16_FIX.c b/drivers/opus/silk/fixed/k2a_Q16_FIX.c
new file mode 100644
index 0000000000..f7e62e95fe
--- /dev/null
+++ b/drivers/opus/silk/fixed/k2a_Q16_FIX.c
@@ -0,0 +1,53 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Step up function, converts reflection coefficients to prediction coefficients */
+void silk_k2a_Q16(
+    opus_int32                  *A_Q24,             /* O    Prediction coefficients [order] Q24                         */
+    const opus_int32            *rc_Q16,            /* I    Reflection coefficients [order] Q16                         */
+    const opus_int32            order               /* I    Prediction order                                            */
+)
+{
+    opus_int   k, n;
+    opus_int32 Atmp[ SILK_MAX_ORDER_LPC ];
+
+    for( k = 0; k < order; k++ ) {
+        for( n = 0; n < k; n++ ) {
+            Atmp[ n ] = A_Q24[ n ];
+        }
+        for( n = 0; n < k; n++ ) {
+            A_Q24[ n ] = silk_SMLAWW( A_Q24[ n ], Atmp[ k - n - 1 ], rc_Q16[ k ] );
+        }
+        A_Q24[ k ] = -silk_LSHIFT( rc_Q16[ k ], 8 );
+    }
+}
diff --git a/drivers/opus/silk/fixed/main_FIX.h b/drivers/opus/silk/fixed/main_FIX.h
new file mode 100644
index 0000000000..fb47ffe700
--- /dev/null
+++ b/drivers/opus/silk/fixed/main_FIX.h
@@ -0,0 +1,257 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MAIN_FIX_H
+#define SILK_MAIN_FIX_H
+
+#include "SigProc_FIX.h"
+#include "structs_FIX.h"
+#include "control.h"
+#include "silk_main.h"
+#include "PLC.h"
+#include "debug.h"
+#include "entenc.h"
+
+#ifndef FORCE_CPP_BUILD
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+#endif
+
+#define silk_encoder_state_Fxx      silk_encoder_state_FIX
+#define silk_encode_do_VAD_Fxx      silk_encode_do_VAD_FIX
+#define silk_encode_frame_Fxx       silk_encode_frame_FIX
+
+/*********************/
+/* Encoder Functions */
+/*********************/
+
+/* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */
+void silk_HP_variable_cutoff(
+    silk_encoder_state_Fxx          state_Fxx[]                             /* I/O  Encoder states                                                              */
+);
+
+/* Encoder main function */
+void silk_encode_do_VAD_FIX(
+    silk_encoder_state_FIX          *psEnc                                  /* I/O  Pointer to Silk FIX encoder state                                           */
+);
+
+/* Encoder main function */
+opus_int silk_encode_frame_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
+    opus_int32                      *pnBytesOut,                            /* O    Pointer to number of payload bytes;                                         */
+    ec_enc                          *psRangeEnc,                            /* I/O  compressor data structure                                                   */
+    opus_int                        condCoding,                             /* I    The type of conditional coding to use                                       */
+    opus_int                        maxBits,                                /* I    If > 0: maximum number of output bits                                       */
+    opus_int                        useCBR                                  /* I    Flag to force constant-bitrate operation                                    */
+);
+
+/* Initializes the Silk encoder state */
+opus_int silk_init_encoder(
+    silk_encoder_state_Fxx          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
+    int                              arch                                   /* I    Run-time architecture                                                       */
+);
+
+/* Control the Silk encoder */
+opus_int silk_control_encoder(
+    silk_encoder_state_Fxx          *psEnc,                                 /* I/O  Pointer to Silk encoder state                                               */
+    silk_EncControlStruct           *encControl,                            /* I    Control structure                                                           */
+    const opus_int32                TargetRate_bps,                         /* I    Target max bitrate (bps)                                                    */
+    const opus_int                  allow_bw_switch,                        /* I    Flag to allow switching audio bandwidth                                     */
+    const opus_int                  channelNb,                              /* I    Channel number                                                              */
+    const opus_int                  force_fs_kHz
+);
+
+/****************/
+/* Prefiltering */
+/****************/
+void silk_prefilter_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state                                                               */
+    const silk_encoder_control_FIX  *psEncCtrl,                             /* I    Encoder control                                                             */
+    opus_int32                      xw_Q10[],                               /* O    Weighted signal                                                             */
+    const opus_int16                x[]                                     /* I    Speech signal                                                               */
+);
+
+/**************************/
+/* Noise shaping analysis */
+/**************************/
+/* Compute noise shaping coefficients and initial gain values */
+void silk_noise_shape_analysis_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state FIX                                                           */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Encoder control FIX                                                         */
+    const opus_int16                *pitch_res,                             /* I    LPC residual from pitch analysis                                            */
+    const opus_int16                *x,                                     /* I    Input signal [ frame_length + la_shape ]                                    */
+    int                              arch                                   /* I    Run-time architecture                                                       */
+);
+
+/* Autocorrelations for a warped frequency axis */
+void silk_warped_autocorrelation_FIX(
+          opus_int32                *corr,                                  /* O    Result [order + 1]                                                          */
+          opus_int                  *scale,                                 /* O    Scaling of the correlation vector                                           */
+    const opus_int16                *input,                                 /* I    Input data to correlate                                                     */
+    const opus_int                  warping_Q16,                            /* I    Warping coefficient                                                         */
+    const opus_int                  length,                                 /* I    Length of input                                                             */
+    const opus_int                  order                                   /* I    Correlation order (even)                                                    */
+);
+
+/* Calculation of LTP state scaling */
+void silk_LTP_scale_ctrl_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
+    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
+);
+
+/**********************************************/
+/* Prediction Analysis                        */
+/**********************************************/
+/* Find pitch lags */
+void silk_find_pitch_lags_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
+    opus_int16                      res[],                                  /* O    residual                                                                    */
+    const opus_int16                x[],                                    /* I    Speech signal                                                               */
+    int                             arch                                    /* I    Run-time architecture                                                       */
+);
+
+/* Find LPC and LTP coefficients */
+void silk_find_pred_coefs_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
+    const opus_int16                res_pitch[],                            /* I    Residual from pitch analysis                                                */
+    const opus_int16                x[],                                    /* I    Speech signal                                                               */
+    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
+);
+
+/* LPC analysis */
+void silk_find_LPC_FIX(
+    silk_encoder_state              *psEncC,                                /* I/O  Encoder state                                                               */
+    opus_int16                      NLSF_Q15[],                             /* O    NLSFs                                                                       */
+    const opus_int16                x[],                                    /* I    Input signal                                                                */
+    const opus_int32                minInvGain_Q30                          /* I    Inverse of max prediction gain                                              */
+);
+
+/* LTP analysis */
+void silk_find_LTP_FIX(
+    opus_int16                      b_Q14[ MAX_NB_SUBFR * LTP_ORDER ],      /* O    LTP coefs                                                                   */
+    opus_int32                      WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization                                           */
+    opus_int                        *LTPredCodGain_Q7,                      /* O    LTP coding gain                                                             */
+    const opus_int16                r_lpc[],                                /* I    residual signal after LPC signal + state for first 10 ms                    */
+    const opus_int                  lag[ MAX_NB_SUBFR ],                    /* I    LTP lags                                                                    */
+    const opus_int32                Wght_Q15[ MAX_NB_SUBFR ],               /* I    weights                                                                     */
+    const opus_int                  subfr_length,                           /* I    subframe length                                                             */
+    const opus_int                  nb_subfr,                               /* I    number of subframes                                                         */
+    const opus_int                  mem_offset,                             /* I    number of samples in LTP memory                                             */
+    opus_int                        corr_rshifts[ MAX_NB_SUBFR ]            /* O    right shifts applied to correlations                                        */
+);
+
+void silk_LTP_analysis_filter_FIX(
+    opus_int16                      *LTP_res,                               /* O    LTP residual signal of length MAX_NB_SUBFR * ( pre_length + subfr_length )  */
+    const opus_int16                *x,                                     /* I    Pointer to input signal with at least max( pitchL ) preceding samples       */
+    const opus_int16                LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],/* I    LTP_ORDER LTP coefficients for each MAX_NB_SUBFR subframe                   */
+    const opus_int                  pitchL[ MAX_NB_SUBFR ],                 /* I    Pitch lag, one for each subframe                                            */
+    const opus_int32                invGains_Q16[ MAX_NB_SUBFR ],           /* I    Inverse quantization gains, one for each subframe                           */
+    const opus_int                  subfr_length,                           /* I    Length of each subframe                                                     */
+    const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
+    const opus_int                  pre_length                              /* I    Length of the preceding samples starting at &x[0] for each subframe         */
+);
+
+/* Calculates residual energies of input subframes where all subframes have LPC_order   */
+/* of preceding samples                                                                 */
+void silk_residual_energy_FIX(
+          opus_int32                nrgs[ MAX_NB_SUBFR ],                   /* O    Residual energy per subframe                                                */
+          opus_int                  nrgsQ[ MAX_NB_SUBFR ],                  /* O    Q value per subframe                                                        */
+    const opus_int16                x[],                                    /* I    Input signal                                                                */
+          opus_int16                a_Q12[ 2 ][ MAX_LPC_ORDER ],            /* I    AR coefs for each frame half                                                */
+    const opus_int32                gains[ MAX_NB_SUBFR ],                  /* I    Quantization gains                                                          */
+    const opus_int                  subfr_length,                           /* I    Subframe length                                                             */
+    const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
+    const opus_int                  LPC_order                               /* I    LPC order                                                                   */
+);
+
+/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
+opus_int32 silk_residual_energy16_covar_FIX(
+    const opus_int16                *c,                                     /* I    Prediction vector                                                           */
+    const opus_int32                *wXX,                                   /* I    Correlation matrix                                                          */
+    const opus_int32                *wXx,                                   /* I    Correlation vector                                                          */
+    opus_int32                      wxx,                                    /* I    Signal energy                                                               */
+    opus_int                        D,                                      /* I    Dimension                                                                   */
+    opus_int                        cQ                                      /* I    Q value for c vector 0 - 15                                                 */
+);
+
+/* Processing of gains */
+void silk_process_gains_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Encoder control                                                             */
+    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
+);
+
+/******************/
+/* Linear Algebra */
+/******************/
+/* Calculates correlation matrix X'*X */
+void silk_corrMatrix_FIX(
+    const opus_int16                *x,                                     /* I    x vector [L + order - 1] used to form data matrix X                         */
+    const opus_int                  L,                                      /* I    Length of vectors                                                           */
+    const opus_int                  order,                                  /* I    Max lag for correlation                                                     */
+    const opus_int                  head_room,                              /* I    Desired headroom                                                            */
+    opus_int32                      *XX,                                    /* O    Pointer to X'*X correlation matrix [ order x order ]                        */
+    opus_int                        *rshifts                                /* I/O  Right shifts of correlations                                                */
+);
+
+/* Calculates correlation vector X'*t */
+void silk_corrVector_FIX(
+    const opus_int16                *x,                                     /* I    x vector [L + order - 1] used to form data matrix X                         */
+    const opus_int16                *t,                                     /* I    Target vector [L]                                                           */
+    const opus_int                  L,                                      /* I    Length of vectors                                                           */
+    const opus_int                  order,                                  /* I    Max lag for correlation                                                     */
+    opus_int32                      *Xt,                                    /* O    Pointer to X'*t correlation vector [order]                                  */
+    const opus_int                  rshifts                                 /* I    Right shifts of correlations                                                */
+);
+
+/* Add noise to matrix diagonal */
+void silk_regularize_correlations_FIX(
+    opus_int32                      *XX,                                    /* I/O  Correlation matrices                                                        */
+    opus_int32                      *xx,                                    /* I/O  Correlation values                                                          */
+    opus_int32                      noise,                                  /* I    Noise to add                                                                */
+    opus_int                        D                                       /* I    Dimension of XX                                                             */
+);
+
+/* Solves Ax = b, assuming A is symmetric */
+void silk_solve_LDL_FIX(
+    opus_int32                      *A,                                     /* I    Pointer to symetric square matrix A                                         */
+    opus_int                        M,                                      /* I    Size of matrix                                                              */
+    const opus_int32                *b,                                     /* I    Pointer to b vector                                                         */
+    opus_int32                      *x_Q16                                  /* O    Pointer to x solution vector                                                */
+);
+
+#ifndef FORCE_CPP_BUILD
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* FORCE_CPP_BUILD */
+#endif /* SILK_MAIN_FIX_H */
diff --git a/drivers/opus/silk/fixed/noise_shape_analysis_FIX.c b/drivers/opus/silk/fixed/noise_shape_analysis_FIX.c
new file mode 100644
index 0000000000..420cbeedfc
--- /dev/null
+++ b/drivers/opus/silk/fixed/noise_shape_analysis_FIX.c
@@ -0,0 +1,445 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+
+/* Compute gain to make warped filter coefficients have a zero mean log frequency response on a   */
+/* non-warped frequency scale. (So that it can be implemented with a minimum-phase monic filter.) */
+/* Note: A monic filter is one with the first coefficient equal to 1.0. In Silk we omit the first */
+/* coefficient in an array of coefficients, for monic filters.                                    */
+static OPUS_INLINE opus_int32 warped_gain( /* gain in Q16*/
+    const opus_int32     *coefs_Q24,
+    opus_int             lambda_Q16,
+    opus_int             order
+) {
+    opus_int   i;
+    opus_int32 gain_Q24;
+
+    lambda_Q16 = -lambda_Q16;
+    gain_Q24 = coefs_Q24[ order - 1 ];
+    for( i = order - 2; i >= 0; i-- ) {
+        gain_Q24 = silk_SMLAWB( coefs_Q24[ i ], gain_Q24, lambda_Q16 );
+    }
+    gain_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), gain_Q24, -lambda_Q16 );
+    return silk_INVERSE32_varQ( gain_Q24, 40 );
+}
+
+/* Convert warped filter coefficients to monic pseudo-warped coefficients and limit maximum     */
+/* amplitude of monic warped coefficients by using bandwidth expansion on the true coefficients */
+static OPUS_INLINE void limit_warped_coefs(
+    opus_int32           *coefs_syn_Q24,
+    opus_int32           *coefs_ana_Q24,
+    opus_int             lambda_Q16,
+    opus_int32           limit_Q24,
+    opus_int             order
+) {
+    opus_int   i, iter, ind = 0;
+    opus_int32 tmp, maxabs_Q24, chirp_Q16, gain_syn_Q16, gain_ana_Q16;
+    opus_int32 nom_Q16, den_Q24;
+
+    /* Convert to monic coefficients */
+    lambda_Q16 = -lambda_Q16;
+    for( i = order - 1; i > 0; i-- ) {
+        coefs_syn_Q24[ i - 1 ] = silk_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 );
+        coefs_ana_Q24[ i - 1 ] = silk_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 );
+    }
+    lambda_Q16 = -lambda_Q16;
+    nom_Q16  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 16 ), -(opus_int32)lambda_Q16,        lambda_Q16 );
+    den_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_syn_Q24[ 0 ], lambda_Q16 );
+    gain_syn_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 );
+    den_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_ana_Q24[ 0 ], lambda_Q16 );
+    gain_ana_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 );
+    for( i = 0; i < order; i++ ) {
+        coefs_syn_Q24[ i ] = silk_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] );
+        coefs_ana_Q24[ i ] = silk_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] );
+    }
+
+    for( iter = 0; iter < 10; iter++ ) {
+        /* Find maximum absolute value */
+        maxabs_Q24 = -1;
+        for( i = 0; i < order; i++ ) {
+            tmp = silk_max( silk_abs_int32( coefs_syn_Q24[ i ] ), silk_abs_int32( coefs_ana_Q24[ i ] ) );
+            if( tmp > maxabs_Q24 ) {
+                maxabs_Q24 = tmp;
+                ind = i;
+            }
+        }
+        if( maxabs_Q24 <= limit_Q24 ) {
+            /* Coefficients are within range - done */
+            return;
+        }
+
+        /* Convert back to true warped coefficients */
+        for( i = 1; i < order; i++ ) {
+            coefs_syn_Q24[ i - 1 ] = silk_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 );
+            coefs_ana_Q24[ i - 1 ] = silk_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 );
+        }
+        gain_syn_Q16 = silk_INVERSE32_varQ( gain_syn_Q16, 32 );
+        gain_ana_Q16 = silk_INVERSE32_varQ( gain_ana_Q16, 32 );
+        for( i = 0; i < order; i++ ) {
+            coefs_syn_Q24[ i ] = silk_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] );
+            coefs_ana_Q24[ i ] = silk_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] );
+        }
+
+        /* Apply bandwidth expansion */
+        chirp_Q16 = SILK_FIX_CONST( 0.99, 16 ) - silk_DIV32_varQ(
+            silk_SMULWB( maxabs_Q24 - limit_Q24, silk_SMLABB( SILK_FIX_CONST( 0.8, 10 ), SILK_FIX_CONST( 0.1, 10 ), iter ) ),
+            silk_MUL( maxabs_Q24, ind + 1 ), 22 );
+        silk_bwexpander_32( coefs_syn_Q24, order, chirp_Q16 );
+        silk_bwexpander_32( coefs_ana_Q24, order, chirp_Q16 );
+
+        /* Convert to monic warped coefficients */
+        lambda_Q16 = -lambda_Q16;
+        for( i = order - 1; i > 0; i-- ) {
+            coefs_syn_Q24[ i - 1 ] = silk_SMLAWB( coefs_syn_Q24[ i - 1 ], coefs_syn_Q24[ i ], lambda_Q16 );
+            coefs_ana_Q24[ i - 1 ] = silk_SMLAWB( coefs_ana_Q24[ i - 1 ], coefs_ana_Q24[ i ], lambda_Q16 );
+        }
+        lambda_Q16 = -lambda_Q16;
+        nom_Q16  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 16 ), -(opus_int32)lambda_Q16,        lambda_Q16 );
+        den_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_syn_Q24[ 0 ], lambda_Q16 );
+        gain_syn_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 );
+        den_Q24  = silk_SMLAWB( SILK_FIX_CONST( 1.0, 24 ), coefs_ana_Q24[ 0 ], lambda_Q16 );
+        gain_ana_Q16 = silk_DIV32_varQ( nom_Q16, den_Q24, 24 );
+        for( i = 0; i < order; i++ ) {
+            coefs_syn_Q24[ i ] = silk_SMULWW( gain_syn_Q16, coefs_syn_Q24[ i ] );
+            coefs_ana_Q24[ i ] = silk_SMULWW( gain_ana_Q16, coefs_ana_Q24[ i ] );
+        }
+    }
+    silk_assert( 0 );
+}
+
+/**************************************************************/
+/* Compute noise shaping coefficients and initial gain values */
+/**************************************************************/
+void silk_noise_shape_analysis_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state FIX                                                           */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Encoder control FIX                                                         */
+    const opus_int16                *pitch_res,                             /* I    LPC residual from pitch analysis                                            */
+    const opus_int16                *x,                                     /* I    Input signal [ frame_length + la_shape ]                                    */
+    int                              arch                                   /* I    Run-time architecture                                                       */
+)
+{
+    silk_shape_state_FIX *psShapeSt = &psEnc->sShape;
+    opus_int     k, i, nSamples, Qnrg, b_Q14, warping_Q16, scale = 0;
+    opus_int32   SNR_adj_dB_Q7, HarmBoost_Q16, HarmShapeGain_Q16, Tilt_Q16, tmp32;
+    opus_int32   nrg, pre_nrg_Q30, log_energy_Q7, log_energy_prev_Q7, energy_variation_Q7;
+    opus_int32   delta_Q16, BWExp1_Q16, BWExp2_Q16, gain_mult_Q16, gain_add_Q16, strength_Q16, b_Q8;
+    opus_int32   auto_corr[     MAX_SHAPE_LPC_ORDER + 1 ];
+    opus_int32   refl_coef_Q16[ MAX_SHAPE_LPC_ORDER ];
+    opus_int32   AR1_Q24[       MAX_SHAPE_LPC_ORDER ];
+    opus_int32   AR2_Q24[       MAX_SHAPE_LPC_ORDER ];
+    VARDECL( opus_int16, x_windowed );
+    const opus_int16 *x_ptr, *pitch_res_ptr;
+    SAVE_STACK;
+
+    /* Point to start of first LPC analysis block */
+    x_ptr = x - psEnc->sCmn.la_shape;
+
+    /****************/
+    /* GAIN CONTROL */
+    /****************/
+    SNR_adj_dB_Q7 = psEnc->sCmn.SNR_dB_Q7;
+
+    /* Input quality is the average of the quality in the lowest two VAD bands */
+    psEncCtrl->input_quality_Q14 = ( opus_int )silk_RSHIFT( (opus_int32)psEnc->sCmn.input_quality_bands_Q15[ 0 ]
+        + psEnc->sCmn.input_quality_bands_Q15[ 1 ], 2 );
+
+    /* Coding quality level, between 0.0_Q0 and 1.0_Q0, but in Q14 */
+    psEncCtrl->coding_quality_Q14 = silk_RSHIFT( silk_sigm_Q15( silk_RSHIFT_ROUND( SNR_adj_dB_Q7 -
+        SILK_FIX_CONST( 20.0, 7 ), 4 ) ), 1 );
+
+    /* Reduce coding SNR during low speech activity */
+    if( psEnc->sCmn.useCBR == 0 ) {
+        b_Q8 = SILK_FIX_CONST( 1.0, 8 ) - psEnc->sCmn.speech_activity_Q8;
+        b_Q8 = silk_SMULWB( silk_LSHIFT( b_Q8, 8 ), b_Q8 );
+        SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7,
+            silk_SMULBB( SILK_FIX_CONST( -BG_SNR_DECR_dB, 7 ) >> ( 4 + 1 ), b_Q8 ),                                       /* Q11*/
+            silk_SMULWB( SILK_FIX_CONST( 1.0, 14 ) + psEncCtrl->input_quality_Q14, psEncCtrl->coding_quality_Q14 ) );     /* Q12*/
+    }
+
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* Reduce gains for periodic signals */
+        SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7, SILK_FIX_CONST( HARM_SNR_INCR_dB, 8 ), psEnc->LTPCorr_Q15 );
+    } else {
+        /* For unvoiced signals and low-quality input, adjust the quality slower than SNR_dB setting */
+        SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7,
+            silk_SMLAWB( SILK_FIX_CONST( 6.0, 9 ), -SILK_FIX_CONST( 0.4, 18 ), psEnc->sCmn.SNR_dB_Q7 ),
+            SILK_FIX_CONST( 1.0, 14 ) - psEncCtrl->input_quality_Q14 );
+    }
+
+    /*************************/
+    /* SPARSENESS PROCESSING */
+    /*************************/
+    /* Set quantizer offset */
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* Initially set to 0; may be overruled in process_gains(..) */
+        psEnc->sCmn.indices.quantOffsetType = 0;
+        psEncCtrl->sparseness_Q8 = 0;
+    } else {
+        /* Sparseness measure, based on relative fluctuations of energy per 2 milliseconds */
+        nSamples = silk_LSHIFT( psEnc->sCmn.fs_kHz, 1 );
+        energy_variation_Q7 = 0;
+        log_energy_prev_Q7  = 0;
+        pitch_res_ptr = pitch_res;
+        for( k = 0; k < silk_SMULBB( SUB_FRAME_LENGTH_MS, psEnc->sCmn.nb_subfr ) / 2; k++ ) {
+            silk_sum_sqr_shift( &nrg, &scale, pitch_res_ptr, nSamples );
+            nrg += silk_RSHIFT( nSamples, scale );           /* Q(-scale)*/
+
+            log_energy_Q7 = silk_lin2log( nrg );
+            if( k > 0 ) {
+                energy_variation_Q7 += silk_abs( log_energy_Q7 - log_energy_prev_Q7 );
+            }
+            log_energy_prev_Q7 = log_energy_Q7;
+            pitch_res_ptr += nSamples;
+        }
+
+        psEncCtrl->sparseness_Q8 = silk_RSHIFT( silk_sigm_Q15( silk_SMULWB( energy_variation_Q7 -
+            SILK_FIX_CONST( 5.0, 7 ), SILK_FIX_CONST( 0.1, 16 ) ) ), 7 );
+
+        /* Set quantization offset depending on sparseness measure */
+        if( psEncCtrl->sparseness_Q8 > SILK_FIX_CONST( SPARSENESS_THRESHOLD_QNT_OFFSET, 8 ) ) {
+            psEnc->sCmn.indices.quantOffsetType = 0;
+        } else {
+            psEnc->sCmn.indices.quantOffsetType = 1;
+        }
+
+        /* Increase coding SNR for sparse signals */
+        SNR_adj_dB_Q7 = silk_SMLAWB( SNR_adj_dB_Q7, SILK_FIX_CONST( SPARSE_SNR_INCR_dB, 15 ), psEncCtrl->sparseness_Q8 - SILK_FIX_CONST( 0.5, 8 ) );
+    }
+
+    /*******************************/
+    /* Control bandwidth expansion */
+    /*******************************/
+    /* More BWE for signals with high prediction gain */
+    strength_Q16 = silk_SMULWB( psEncCtrl->predGain_Q16, SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) );
+    BWExp1_Q16 = BWExp2_Q16 = silk_DIV32_varQ( SILK_FIX_CONST( BANDWIDTH_EXPANSION, 16 ),
+        silk_SMLAWW( SILK_FIX_CONST( 1.0, 16 ), strength_Q16, strength_Q16 ), 16 );
+    delta_Q16  = silk_SMULWB( SILK_FIX_CONST( 1.0, 16 ) - silk_SMULBB( 3, psEncCtrl->coding_quality_Q14 ),
+        SILK_FIX_CONST( LOW_RATE_BANDWIDTH_EXPANSION_DELTA, 16 ) );
+    BWExp1_Q16 = silk_SUB32( BWExp1_Q16, delta_Q16 );
+    BWExp2_Q16 = silk_ADD32( BWExp2_Q16, delta_Q16 );
+    /* BWExp1 will be applied after BWExp2, so make it relative */
+    BWExp1_Q16 = silk_DIV32_16( silk_LSHIFT( BWExp1_Q16, 14 ), silk_RSHIFT( BWExp2_Q16, 2 ) );
+
+    if( psEnc->sCmn.warping_Q16 > 0 ) {
+        /* Slightly more warping in analysis will move quantization noise up in frequency, where it's better masked */
+        warping_Q16 = silk_SMLAWB( psEnc->sCmn.warping_Q16, (opus_int32)psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( 0.01, 18 ) );
+    } else {
+        warping_Q16 = 0;
+    }
+
+    /********************************************/
+    /* Compute noise shaping AR coefs and gains */
+    /********************************************/
+    ALLOC( x_windowed, psEnc->sCmn.shapeWinLength, opus_int16 );
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        /* Apply window: sine slope followed by flat part followed by cosine slope */
+        opus_int shift, slope_part, flat_part;
+        flat_part = psEnc->sCmn.fs_kHz * 3;
+        slope_part = silk_RSHIFT( psEnc->sCmn.shapeWinLength - flat_part, 1 );
+
+        silk_apply_sine_window( x_windowed, x_ptr, 1, slope_part );
+        shift = slope_part;
+        silk_memcpy( x_windowed + shift, x_ptr + shift, flat_part * sizeof(opus_int16) );
+        shift += flat_part;
+        silk_apply_sine_window( x_windowed + shift, x_ptr + shift, 2, slope_part );
+
+        /* Update pointer: next LPC analysis block */
+        x_ptr += psEnc->sCmn.subfr_length;
+
+        if( psEnc->sCmn.warping_Q16 > 0 ) {
+            /* Calculate warped auto correlation */
+            silk_warped_autocorrelation_FIX( auto_corr, &scale, x_windowed, warping_Q16, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder );
+        } else {
+            /* Calculate regular auto correlation */
+            silk_autocorr( auto_corr, &scale, x_windowed, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder + 1, arch );
+        }
+
+        /* Add white noise, as a fraction of energy */
+        auto_corr[0] = silk_ADD32( auto_corr[0], silk_max_32( silk_SMULWB( silk_RSHIFT( auto_corr[ 0 ], 4 ),
+            SILK_FIX_CONST( SHAPE_WHITE_NOISE_FRACTION, 20 ) ), 1 ) );
+
+        /* Calculate the reflection coefficients using schur */
+        nrg = silk_schur64( refl_coef_Q16, auto_corr, psEnc->sCmn.shapingLPCOrder );
+        silk_assert( nrg >= 0 );
+
+        /* Convert reflection coefficients to prediction coefficients */
+        silk_k2a_Q16( AR2_Q24, refl_coef_Q16, psEnc->sCmn.shapingLPCOrder );
+
+        Qnrg = -scale;          /* range: -12...30*/
+        silk_assert( Qnrg >= -12 );
+        silk_assert( Qnrg <=  30 );
+
+        /* Make sure that Qnrg is an even number */
+        if( Qnrg & 1 ) {
+            Qnrg -= 1;
+            nrg >>= 1;
+        }
+
+        tmp32 = silk_SQRT_APPROX( nrg );
+        Qnrg >>= 1;             /* range: -6...15*/
+
+        psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( tmp32, 16 - Qnrg );
+
+        if( psEnc->sCmn.warping_Q16 > 0 ) {
+            /* Adjust gain for warping */
+            gain_mult_Q16 = warped_gain( AR2_Q24, warping_Q16, psEnc->sCmn.shapingLPCOrder );
+            silk_assert( psEncCtrl->Gains_Q16[ k ] >= 0 );
+            if ( silk_SMULWW( silk_RSHIFT_ROUND( psEncCtrl->Gains_Q16[ k ], 1 ), gain_mult_Q16 ) >= ( silk_int32_MAX >> 1 ) ) {
+               psEncCtrl->Gains_Q16[ k ] = silk_int32_MAX;
+            } else {
+               psEncCtrl->Gains_Q16[ k ] = silk_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 );
+            }
+        }
+
+        /* Bandwidth expansion for synthesis filter shaping */
+        silk_bwexpander_32( AR2_Q24, psEnc->sCmn.shapingLPCOrder, BWExp2_Q16 );
+
+        /* Compute noise shaping filter coefficients */
+        silk_memcpy( AR1_Q24, AR2_Q24, psEnc->sCmn.shapingLPCOrder * sizeof( opus_int32 ) );
+
+        /* Bandwidth expansion for analysis filter shaping */
+        silk_assert( BWExp1_Q16 <= SILK_FIX_CONST( 1.0, 16 ) );
+        silk_bwexpander_32( AR1_Q24, psEnc->sCmn.shapingLPCOrder, BWExp1_Q16 );
+
+        /* Ratio of prediction gains, in energy domain */
+        pre_nrg_Q30 = silk_LPC_inverse_pred_gain_Q24( AR2_Q24, psEnc->sCmn.shapingLPCOrder );
+        nrg         = silk_LPC_inverse_pred_gain_Q24( AR1_Q24, psEnc->sCmn.shapingLPCOrder );
+
+        /*psEncCtrl->GainsPre[ k ] = 1.0f - 0.7f * ( 1.0f - pre_nrg / nrg ) = 0.3f + 0.7f * pre_nrg / nrg;*/
+        pre_nrg_Q30 = silk_LSHIFT32( silk_SMULWB( pre_nrg_Q30, SILK_FIX_CONST( 0.7, 15 ) ), 1 );
+        psEncCtrl->GainsPre_Q14[ k ] = ( opus_int ) SILK_FIX_CONST( 0.3, 14 ) + silk_DIV32_varQ( pre_nrg_Q30, nrg, 14 );
+
+        /* Convert to monic warped prediction coefficients and limit absolute values */
+        limit_warped_coefs( AR2_Q24, AR1_Q24, warping_Q16, SILK_FIX_CONST( 3.999, 24 ), psEnc->sCmn.shapingLPCOrder );
+
+        /* Convert from Q24 to Q13 and store in int16 */
+        for( i = 0; i < psEnc->sCmn.shapingLPCOrder; i++ ) {
+            psEncCtrl->AR1_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( AR1_Q24[ i ], 11 ) );
+            psEncCtrl->AR2_Q13[ k * MAX_SHAPE_LPC_ORDER + i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( AR2_Q24[ i ], 11 ) );
+        }
+    }
+
+    /*****************/
+    /* Gain tweaking */
+    /*****************/
+    /* Increase gains during low speech activity and put lower limit on gains */
+    gain_mult_Q16 = silk_log2lin( -silk_SMLAWB( -SILK_FIX_CONST( 16.0, 7 ), SNR_adj_dB_Q7, SILK_FIX_CONST( 0.16, 16 ) ) );
+    gain_add_Q16  = silk_log2lin(  silk_SMLAWB(  SILK_FIX_CONST( 16.0, 7 ), SILK_FIX_CONST( MIN_QGAIN_DB, 7 ), SILK_FIX_CONST( 0.16, 16 ) ) );
+    silk_assert( gain_mult_Q16 > 0 );
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        psEncCtrl->Gains_Q16[ k ] = silk_SMULWW( psEncCtrl->Gains_Q16[ k ], gain_mult_Q16 );
+        silk_assert( psEncCtrl->Gains_Q16[ k ] >= 0 );
+        psEncCtrl->Gains_Q16[ k ] = silk_ADD_POS_SAT32( psEncCtrl->Gains_Q16[ k ], gain_add_Q16 );
+    }
+
+    gain_mult_Q16 = SILK_FIX_CONST( 1.0, 16 ) + silk_RSHIFT_ROUND( silk_MLA( SILK_FIX_CONST( INPUT_TILT, 26 ),
+        psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( HIGH_RATE_INPUT_TILT, 12 ) ), 10 );
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        psEncCtrl->GainsPre_Q14[ k ] = silk_SMULWB( gain_mult_Q16, psEncCtrl->GainsPre_Q14[ k ] );
+    }
+
+    /************************************************/
+    /* Control low-frequency shaping and noise tilt */
+    /************************************************/
+    /* Less low frequency shaping for noisy inputs */
+    strength_Q16 = silk_MUL( SILK_FIX_CONST( LOW_FREQ_SHAPING, 4 ), silk_SMLAWB( SILK_FIX_CONST( 1.0, 12 ),
+        SILK_FIX_CONST( LOW_QUALITY_LOW_FREQ_SHAPING_DECR, 13 ), psEnc->sCmn.input_quality_bands_Q15[ 0 ] - SILK_FIX_CONST( 1.0, 15 ) ) );
+    strength_Q16 = silk_RSHIFT( silk_MUL( strength_Q16, psEnc->sCmn.speech_activity_Q8 ), 8 );
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* Reduce low frequencies quantization noise for periodic signals, depending on pitch lag */
+        /*f = 400; freqz([1, -0.98 + 2e-4 * f], [1, -0.97 + 7e-4 * f], 2^12, Fs); axis([0, 1000, -10, 1])*/
+        opus_int fs_kHz_inv = silk_DIV32_16( SILK_FIX_CONST( 0.2, 14 ), psEnc->sCmn.fs_kHz );
+        for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+            b_Q14 = fs_kHz_inv + silk_DIV32_16( SILK_FIX_CONST( 3.0, 14 ), psEncCtrl->pitchL[ k ] );
+            /* Pack two coefficients in one int32 */
+            psEncCtrl->LF_shp_Q14[ k ]  = silk_LSHIFT( SILK_FIX_CONST( 1.0, 14 ) - b_Q14 - silk_SMULWB( strength_Q16, b_Q14 ), 16 );
+            psEncCtrl->LF_shp_Q14[ k ] |= (opus_uint16)( b_Q14 - SILK_FIX_CONST( 1.0, 14 ) );
+        }
+        silk_assert( SILK_FIX_CONST( HARM_HP_NOISE_COEF, 24 ) < SILK_FIX_CONST( 0.5, 24 ) ); /* Guarantees that second argument to SMULWB() is within range of an opus_int16*/
+        Tilt_Q16 = - SILK_FIX_CONST( HP_NOISE_COEF, 16 ) -
+            silk_SMULWB( SILK_FIX_CONST( 1.0, 16 ) - SILK_FIX_CONST( HP_NOISE_COEF, 16 ),
+                silk_SMULWB( SILK_FIX_CONST( HARM_HP_NOISE_COEF, 24 ), psEnc->sCmn.speech_activity_Q8 ) );
+    } else {
+        b_Q14 = silk_DIV32_16( 21299, psEnc->sCmn.fs_kHz ); /* 1.3_Q0 = 21299_Q14*/
+        /* Pack two coefficients in one int32 */
+        psEncCtrl->LF_shp_Q14[ 0 ]  = silk_LSHIFT( SILK_FIX_CONST( 1.0, 14 ) - b_Q14 -
+            silk_SMULWB( strength_Q16, silk_SMULWB( SILK_FIX_CONST( 0.6, 16 ), b_Q14 ) ), 16 );
+        psEncCtrl->LF_shp_Q14[ 0 ] |= (opus_uint16)( b_Q14 - SILK_FIX_CONST( 1.0, 14 ) );
+        for( k = 1; k < psEnc->sCmn.nb_subfr; k++ ) {
+            psEncCtrl->LF_shp_Q14[ k ] = psEncCtrl->LF_shp_Q14[ 0 ];
+        }
+        Tilt_Q16 = -SILK_FIX_CONST( HP_NOISE_COEF, 16 );
+    }
+
+    /****************************/
+    /* HARMONIC SHAPING CONTROL */
+    /****************************/
+    /* Control boosting of harmonic frequencies */
+    HarmBoost_Q16 = silk_SMULWB( silk_SMULWB( SILK_FIX_CONST( 1.0, 17 ) - silk_LSHIFT( psEncCtrl->coding_quality_Q14, 3 ),
+        psEnc->LTPCorr_Q15 ), SILK_FIX_CONST( LOW_RATE_HARMONIC_BOOST, 16 ) );
+
+    /* More harmonic boost for noisy input signals */
+    HarmBoost_Q16 = silk_SMLAWB( HarmBoost_Q16,
+        SILK_FIX_CONST( 1.0, 16 ) - silk_LSHIFT( psEncCtrl->input_quality_Q14, 2 ), SILK_FIX_CONST( LOW_INPUT_QUALITY_HARMONIC_BOOST, 16 ) );
+
+    if( USE_HARM_SHAPING && psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* More harmonic noise shaping for high bitrates or noisy input */
+        HarmShapeGain_Q16 = silk_SMLAWB( SILK_FIX_CONST( HARMONIC_SHAPING, 16 ),
+                SILK_FIX_CONST( 1.0, 16 ) - silk_SMULWB( SILK_FIX_CONST( 1.0, 18 ) - silk_LSHIFT( psEncCtrl->coding_quality_Q14, 4 ),
+                psEncCtrl->input_quality_Q14 ), SILK_FIX_CONST( HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING, 16 ) );
+
+        /* Less harmonic noise shaping for less periodic signals */
+        HarmShapeGain_Q16 = silk_SMULWB( silk_LSHIFT( HarmShapeGain_Q16, 1 ),
+            silk_SQRT_APPROX( silk_LSHIFT( psEnc->LTPCorr_Q15, 15 ) ) );
+    } else {
+        HarmShapeGain_Q16 = 0;
+    }
+
+    /*************************/
+    /* Smooth over subframes */
+    /*************************/
+    for( k = 0; k < MAX_NB_SUBFR; k++ ) {
+        psShapeSt->HarmBoost_smth_Q16 =
+            silk_SMLAWB( psShapeSt->HarmBoost_smth_Q16,     HarmBoost_Q16     - psShapeSt->HarmBoost_smth_Q16,     SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) );
+        psShapeSt->HarmShapeGain_smth_Q16 =
+            silk_SMLAWB( psShapeSt->HarmShapeGain_smth_Q16, HarmShapeGain_Q16 - psShapeSt->HarmShapeGain_smth_Q16, SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) );
+        psShapeSt->Tilt_smth_Q16 =
+            silk_SMLAWB( psShapeSt->Tilt_smth_Q16,          Tilt_Q16          - psShapeSt->Tilt_smth_Q16,          SILK_FIX_CONST( SUBFR_SMTH_COEF, 16 ) );
+
+        psEncCtrl->HarmBoost_Q14[ k ]     = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->HarmBoost_smth_Q16,     2 );
+        psEncCtrl->HarmShapeGain_Q14[ k ] = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->HarmShapeGain_smth_Q16, 2 );
+        psEncCtrl->Tilt_Q14[ k ]          = ( opus_int )silk_RSHIFT_ROUND( psShapeSt->Tilt_smth_Q16,          2 );
+    }
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/fixed/pitch_analysis_core_FIX.c b/drivers/opus/silk/fixed/pitch_analysis_core_FIX.c
new file mode 100644
index 0000000000..4d65c09d1d
--- /dev/null
+++ b/drivers/opus/silk/fixed/pitch_analysis_core_FIX.c
@@ -0,0 +1,744 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/***********************************************************
+* Pitch analyser function
+********************************************************** */
+#include "SigProc_FIX.h"
+#include "pitch_est_defines.h"
+#include "stack_alloc.h"
+#include "debug.h"
+#include "pitch.h"
+
+#define SCRATCH_SIZE    22
+#define SF_LENGTH_4KHZ  ( PE_SUBFR_LENGTH_MS * 4 )
+#define SF_LENGTH_8KHZ  ( PE_SUBFR_LENGTH_MS * 8 )
+#define MIN_LAG_4KHZ    ( PE_MIN_LAG_MS * 4 )
+#define MIN_LAG_8KHZ    ( PE_MIN_LAG_MS * 8 )
+#define MAX_LAG_4KHZ    ( PE_MAX_LAG_MS * 4 )
+#define MAX_LAG_8KHZ    ( PE_MAX_LAG_MS * 8 - 1 )
+#define CSTRIDE_4KHZ    ( MAX_LAG_4KHZ + 1 - MIN_LAG_4KHZ )
+#define CSTRIDE_8KHZ    ( MAX_LAG_8KHZ + 3 - ( MIN_LAG_8KHZ - 2 ) )
+#define D_COMP_MIN      ( MIN_LAG_8KHZ - 3 )
+#define D_COMP_MAX      ( MAX_LAG_8KHZ + 4 )
+#define D_COMP_STRIDE   ( D_COMP_MAX - D_COMP_MIN )
+
+typedef opus_int32 silk_pe_stage3_vals[ PE_NB_STAGE3_LAGS ];
+
+/************************************************************/
+/* Internally used functions                                */
+/************************************************************/
+static void silk_P_Ana_calc_corr_st3(
+    silk_pe_stage3_vals cross_corr_st3[],              /* O 3 DIM correlation array */
+    const opus_int16  frame[],                         /* I vector to correlate         */
+    opus_int          start_lag,                       /* I lag offset to search around */
+    opus_int          sf_length,                       /* I length of a 5 ms subframe   */
+    opus_int          nb_subfr,                        /* I number of subframes         */
+    opus_int          complexity,                      /* I Complexity setting          */
+    int               arch                             /* I Run-time architecture       */
+);
+
+static void silk_P_Ana_calc_energy_st3(
+    silk_pe_stage3_vals energies_st3[],                /* O 3 DIM energy array */
+    const opus_int16  frame[],                         /* I vector to calc energy in    */
+    opus_int          start_lag,                       /* I lag offset to search around */
+    opus_int          sf_length,                       /* I length of one 5 ms subframe */
+    opus_int          nb_subfr,                        /* I number of subframes         */
+    opus_int          complexity                       /* I Complexity setting          */
+);
+
+/*************************************************************/
+/*      FIXED POINT CORE PITCH ANALYSIS FUNCTION             */
+/*************************************************************/
+opus_int silk_pitch_analysis_core(                  /* O    Voicing estimate: 0 voiced, 1 unvoiced                      */
+    const opus_int16            *frame,             /* I    Signal of length PE_FRAME_LENGTH_MS*Fs_kHz                  */
+    opus_int                    *pitch_out,         /* O    4 pitch lag values                                          */
+    opus_int16                  *lagIndex,          /* O    Lag Index                                                   */
+    opus_int8                   *contourIndex,      /* O    Pitch contour Index                                         */
+    opus_int                    *LTPCorr_Q15,       /* I/O  Normalized correlation; input: value from previous frame    */
+    opus_int                    prevLag,            /* I    Last lag of previous frame; set to zero is unvoiced         */
+    const opus_int32            search_thres1_Q16,  /* I    First stage threshold for lag candidates 0 - 1              */
+    const opus_int              search_thres2_Q13,  /* I    Final threshold for lag candidates 0 - 1                    */
+    const opus_int              Fs_kHz,             /* I    Sample frequency (kHz)                                      */
+    const opus_int              complexity,         /* I    Complexity setting, 0-2, where 2 is highest                 */
+    const opus_int              nb_subfr,           /* I    number of 5 ms subframes                                    */
+    int                         arch                /* I    Run-time architecture                                       */
+)
+{
+    VARDECL( opus_int16, frame_8kHz );
+    VARDECL( opus_int16, frame_4kHz );
+    opus_int32 filt_state[ 6 ];
+    const opus_int16 *input_frame_ptr;
+    opus_int   i, k, d, j;
+    VARDECL( opus_int16, C );
+    VARDECL( opus_int32, xcorr32 );
+    const opus_int16 *target_ptr, *basis_ptr;
+    opus_int32 cross_corr, normalizer, energy, shift, energy_basis, energy_target;
+    opus_int   d_srch[ PE_D_SRCH_LENGTH ], Cmax, length_d_srch, length_d_comp;
+    VARDECL( opus_int16, d_comp );
+    opus_int32 sum, threshold, lag_counter;
+    opus_int   CBimax, CBimax_new, CBimax_old, lag, start_lag, end_lag, lag_new;
+    opus_int32 CC[ PE_NB_CBKS_STAGE2_EXT ], CCmax, CCmax_b, CCmax_new_b, CCmax_new;
+    VARDECL( silk_pe_stage3_vals, energies_st3 );
+    VARDECL( silk_pe_stage3_vals, cross_corr_st3 );
+    opus_int   frame_length, frame_length_8kHz, frame_length_4kHz;
+    opus_int   sf_length;
+    opus_int   min_lag;
+    opus_int   max_lag;
+    opus_int32 contour_bias_Q15, diff;
+    opus_int   nb_cbk_search, cbk_size;
+    opus_int32 delta_lag_log2_sqr_Q7, lag_log2_Q7, prevLag_log2_Q7, prev_lag_bias_Q13;
+    const opus_int8 *Lag_CB_ptr;
+    SAVE_STACK;
+    /* Check for valid sampling frequency */
+    silk_assert( Fs_kHz == 8 || Fs_kHz == 12 || Fs_kHz == 16 );
+
+    /* Check for valid complexity setting */
+    silk_assert( complexity >= SILK_PE_MIN_COMPLEX );
+    silk_assert( complexity <= SILK_PE_MAX_COMPLEX );
+
+    silk_assert( search_thres1_Q16 >= 0 && search_thres1_Q16 <= (1<<16) );
+    silk_assert( search_thres2_Q13 >= 0 && search_thres2_Q13 <= (1<<13) );
+
+    /* Set up frame lengths max / min lag for the sampling frequency */
+    frame_length      = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * Fs_kHz;
+    frame_length_4kHz = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * 4;
+    frame_length_8kHz = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * 8;
+    sf_length         = PE_SUBFR_LENGTH_MS * Fs_kHz;
+    min_lag           = PE_MIN_LAG_MS * Fs_kHz;
+    max_lag           = PE_MAX_LAG_MS * Fs_kHz - 1;
+
+    /* Resample from input sampled at Fs_kHz to 8 kHz */
+    ALLOC( frame_8kHz, frame_length_8kHz, opus_int16 );
+    if( Fs_kHz == 16 ) {
+        silk_memset( filt_state, 0, 2 * sizeof( opus_int32 ) );
+        silk_resampler_down2( filt_state, frame_8kHz, frame, frame_length );
+    } else if( Fs_kHz == 12 ) {
+        silk_memset( filt_state, 0, 6 * sizeof( opus_int32 ) );
+        silk_resampler_down2_3( filt_state, frame_8kHz, frame, frame_length );
+    } else {
+        silk_assert( Fs_kHz == 8 );
+        silk_memcpy( frame_8kHz, frame, frame_length_8kHz * sizeof(opus_int16) );
+    }
+
+    /* Decimate again to 4 kHz */
+    silk_memset( filt_state, 0, 2 * sizeof( opus_int32 ) );/* Set state to zero */
+    ALLOC( frame_4kHz, frame_length_4kHz, opus_int16 );
+    silk_resampler_down2( filt_state, frame_4kHz, frame_8kHz, frame_length_8kHz );
+
+    /* Low-pass filter */
+    for( i = frame_length_4kHz - 1; i > 0; i-- ) {
+        frame_4kHz[ i ] = silk_ADD_SAT16( frame_4kHz[ i ], frame_4kHz[ i - 1 ] );
+    }
+
+    /*******************************************************************************
+    ** Scale 4 kHz signal down to prevent correlations measures from overflowing
+    ** find scaling as max scaling for each 8kHz(?) subframe
+    *******************************************************************************/
+
+    /* Inner product is calculated with different lengths, so scale for the worst case */
+    silk_sum_sqr_shift( &energy, &shift, frame_4kHz, frame_length_4kHz );
+    if( shift > 0 ) {
+        shift = silk_RSHIFT( shift, 1 );
+        for( i = 0; i < frame_length_4kHz; i++ ) {
+            frame_4kHz[ i ] = silk_RSHIFT( frame_4kHz[ i ], shift );
+        }
+    }
+
+    /******************************************************************************
+    * FIRST STAGE, operating in 4 khz
+    ******************************************************************************/
+    ALLOC( C, nb_subfr * CSTRIDE_8KHZ, opus_int16 );
+    ALLOC( xcorr32, MAX_LAG_4KHZ-MIN_LAG_4KHZ+1, opus_int32 );
+    silk_memset( C, 0, (nb_subfr >> 1) * CSTRIDE_4KHZ * sizeof( opus_int16 ) );
+    target_ptr = &frame_4kHz[ silk_LSHIFT( SF_LENGTH_4KHZ, 2 ) ];
+    for( k = 0; k < nb_subfr >> 1; k++ ) {
+        /* Check that we are within range of the array */
+        silk_assert( target_ptr >= frame_4kHz );
+        silk_assert( target_ptr + SF_LENGTH_8KHZ <= frame_4kHz + frame_length_4kHz );
+
+        basis_ptr = target_ptr - MIN_LAG_4KHZ;
+
+        /* Check that we are within range of the array */
+        silk_assert( basis_ptr >= frame_4kHz );
+        silk_assert( basis_ptr + SF_LENGTH_8KHZ <= frame_4kHz + frame_length_4kHz );
+
+        celt_pitch_xcorr( target_ptr, target_ptr - MAX_LAG_4KHZ, xcorr32, SF_LENGTH_8KHZ, MAX_LAG_4KHZ - MIN_LAG_4KHZ + 1, arch );
+
+        /* Calculate first vector products before loop */
+        cross_corr = xcorr32[ MAX_LAG_4KHZ - MIN_LAG_4KHZ ];
+        normalizer = silk_inner_prod_aligned( target_ptr, target_ptr, SF_LENGTH_8KHZ );
+        normalizer = silk_ADD32( normalizer, silk_inner_prod_aligned( basis_ptr,  basis_ptr, SF_LENGTH_8KHZ ) );
+        normalizer = silk_ADD32( normalizer, silk_SMULBB( SF_LENGTH_8KHZ, 4000 ) );
+
+        matrix_ptr( C, k, 0, CSTRIDE_4KHZ ) =
+            (opus_int16)silk_DIV32_varQ( cross_corr, normalizer, 13 + 1 );                      /* Q13 */
+
+        /* From now on normalizer is computed recursively */
+        for( d = MIN_LAG_4KHZ + 1; d <= MAX_LAG_4KHZ; d++ ) {
+            basis_ptr--;
+
+            /* Check that we are within range of the array */
+            silk_assert( basis_ptr >= frame_4kHz );
+            silk_assert( basis_ptr + SF_LENGTH_8KHZ <= frame_4kHz + frame_length_4kHz );
+
+            cross_corr = xcorr32[ MAX_LAG_4KHZ - d ];
+
+            /* Add contribution of new sample and remove contribution from oldest sample */
+            normalizer = silk_ADD32( normalizer,
+                silk_SMULBB( basis_ptr[ 0 ], basis_ptr[ 0 ] ) -
+                silk_SMULBB( basis_ptr[ SF_LENGTH_8KHZ ], basis_ptr[ SF_LENGTH_8KHZ ] ) );
+
+            matrix_ptr( C, k, d - MIN_LAG_4KHZ, CSTRIDE_4KHZ) =
+                (opus_int16)silk_DIV32_varQ( cross_corr, normalizer, 13 + 1 );                  /* Q13 */
+        }
+        /* Update target pointer */
+        target_ptr += SF_LENGTH_8KHZ;
+    }
+
+    /* Combine two subframes into single correlation measure and apply short-lag bias */
+    if( nb_subfr == PE_MAX_NB_SUBFR ) {
+        for( i = MAX_LAG_4KHZ; i >= MIN_LAG_4KHZ; i-- ) {
+            sum = (opus_int32)matrix_ptr( C, 0, i - MIN_LAG_4KHZ, CSTRIDE_4KHZ )
+                + (opus_int32)matrix_ptr( C, 1, i - MIN_LAG_4KHZ, CSTRIDE_4KHZ );               /* Q14 */
+            sum = silk_SMLAWB( sum, sum, silk_LSHIFT( -i, 4 ) );                                /* Q14 */
+            C[ i - MIN_LAG_4KHZ ] = (opus_int16)sum;                                            /* Q14 */
+        }
+    } else {
+        /* Only short-lag bias */
+        for( i = MAX_LAG_4KHZ; i >= MIN_LAG_4KHZ; i-- ) {
+            sum = silk_LSHIFT( (opus_int32)C[ i - MIN_LAG_4KHZ ], 1 );                          /* Q14 */
+            sum = silk_SMLAWB( sum, sum, silk_LSHIFT( -i, 4 ) );                                /* Q14 */
+            C[ i - MIN_LAG_4KHZ ] = (opus_int16)sum;                                            /* Q14 */
+        }
+    }
+
+    /* Sort */
+    length_d_srch = silk_ADD_LSHIFT32( 4, complexity, 1 );
+    silk_assert( 3 * length_d_srch <= PE_D_SRCH_LENGTH );
+    silk_insertion_sort_decreasing_int16( C, d_srch, CSTRIDE_4KHZ,
+                                          length_d_srch );
+
+    /* Escape if correlation is very low already here */
+    Cmax = (opus_int)C[ 0 ];                                                    /* Q14 */
+    if( Cmax < SILK_FIX_CONST( 0.2, 14 ) ) {
+        silk_memset( pitch_out, 0, nb_subfr * sizeof( opus_int ) );
+        *LTPCorr_Q15  = 0;
+        *lagIndex     = 0;
+        *contourIndex = 0;
+        RESTORE_STACK;
+        return 1;
+    }
+
+    threshold = silk_SMULWB( search_thres1_Q16, Cmax );
+    for( i = 0; i < length_d_srch; i++ ) {
+        /* Convert to 8 kHz indices for the sorted correlation that exceeds the threshold */
+        if( C[ i ] > threshold ) {
+            d_srch[ i ] = silk_LSHIFT( d_srch[ i ] + MIN_LAG_4KHZ, 1 );
+        } else {
+            length_d_srch = i;
+            break;
+        }
+    }
+    silk_assert( length_d_srch > 0 );
+
+    ALLOC( d_comp, D_COMP_STRIDE, opus_int16 );
+    for( i = D_COMP_MIN; i < D_COMP_MAX; i++ ) {
+        d_comp[ i - D_COMP_MIN ] = 0;
+    }
+    for( i = 0; i < length_d_srch; i++ ) {
+        d_comp[ d_srch[ i ] - D_COMP_MIN ] = 1;
+    }
+
+    /* Convolution */
+    for( i = D_COMP_MAX - 1; i >= MIN_LAG_8KHZ; i-- ) {
+        d_comp[ i - D_COMP_MIN ] +=
+            d_comp[ i - 1 - D_COMP_MIN ] + d_comp[ i - 2 - D_COMP_MIN ];
+    }
+
+    length_d_srch = 0;
+    for( i = MIN_LAG_8KHZ; i < MAX_LAG_8KHZ + 1; i++ ) {
+        if( d_comp[ i + 1 - D_COMP_MIN ] > 0 ) {
+            d_srch[ length_d_srch ] = i;
+            length_d_srch++;
+        }
+    }
+
+    /* Convolution */
+    for( i = D_COMP_MAX - 1; i >= MIN_LAG_8KHZ; i-- ) {
+        d_comp[ i - D_COMP_MIN ] += d_comp[ i - 1 - D_COMP_MIN ]
+            + d_comp[ i - 2 - D_COMP_MIN ] + d_comp[ i - 3 - D_COMP_MIN ];
+    }
+
+    length_d_comp = 0;
+    for( i = MIN_LAG_8KHZ; i < D_COMP_MAX; i++ ) {
+        if( d_comp[ i - D_COMP_MIN ] > 0 ) {
+            d_comp[ length_d_comp ] = i - 2;
+            length_d_comp++;
+        }
+    }
+
+    /**********************************************************************************
+    ** SECOND STAGE, operating at 8 kHz, on lag sections with high correlation
+    *************************************************************************************/
+
+    /******************************************************************************
+    ** Scale signal down to avoid correlations measures from overflowing
+    *******************************************************************************/
+    /* find scaling as max scaling for each subframe */
+    silk_sum_sqr_shift( &energy, &shift, frame_8kHz, frame_length_8kHz );
+    if( shift > 0 ) {
+        shift = silk_RSHIFT( shift, 1 );
+        for( i = 0; i < frame_length_8kHz; i++ ) {
+            frame_8kHz[ i ] = silk_RSHIFT( frame_8kHz[ i ], shift );
+        }
+    }
+
+    /*********************************************************************************
+    * Find energy of each subframe projected onto its history, for a range of delays
+    *********************************************************************************/
+    silk_memset( C, 0, nb_subfr * CSTRIDE_8KHZ * sizeof( opus_int16 ) );
+
+    target_ptr = &frame_8kHz[ PE_LTP_MEM_LENGTH_MS * 8 ];
+    for( k = 0; k < nb_subfr; k++ ) {
+
+        /* Check that we are within range of the array */
+        silk_assert( target_ptr >= frame_8kHz );
+        silk_assert( target_ptr + SF_LENGTH_8KHZ <= frame_8kHz + frame_length_8kHz );
+
+        energy_target = silk_ADD32( silk_inner_prod_aligned( target_ptr, target_ptr, SF_LENGTH_8KHZ ), 1 );
+        for( j = 0; j < length_d_comp; j++ ) {
+            d = d_comp[ j ];
+            basis_ptr = target_ptr - d;
+
+            /* Check that we are within range of the array */
+            silk_assert( basis_ptr >= frame_8kHz );
+            silk_assert( basis_ptr + SF_LENGTH_8KHZ <= frame_8kHz + frame_length_8kHz );
+
+            cross_corr = silk_inner_prod_aligned( target_ptr, basis_ptr, SF_LENGTH_8KHZ );
+            if( cross_corr > 0 ) {
+                energy_basis = silk_inner_prod_aligned( basis_ptr, basis_ptr, SF_LENGTH_8KHZ );
+                matrix_ptr( C, k, d - ( MIN_LAG_8KHZ - 2 ), CSTRIDE_8KHZ ) =
+                    (opus_int16)silk_DIV32_varQ( cross_corr,
+                                                 silk_ADD32( energy_target,
+                                                             energy_basis ),
+                                                 13 + 1 );                                      /* Q13 */
+            } else {
+                matrix_ptr( C, k, d - ( MIN_LAG_8KHZ - 2 ), CSTRIDE_8KHZ ) = 0;
+            }
+        }
+        target_ptr += SF_LENGTH_8KHZ;
+    }
+
+    /* search over lag range and lags codebook */
+    /* scale factor for lag codebook, as a function of center lag */
+
+    CCmax   = silk_int32_MIN;
+    CCmax_b = silk_int32_MIN;
+
+    CBimax = 0; /* To avoid returning undefined lag values */
+    lag = -1;   /* To check if lag with strong enough correlation has been found */
+
+    if( prevLag > 0 ) {
+        if( Fs_kHz == 12 ) {
+            prevLag = silk_DIV32_16( silk_LSHIFT( prevLag, 1 ), 3 );
+        } else if( Fs_kHz == 16 ) {
+            prevLag = silk_RSHIFT( prevLag, 1 );
+        }
+        prevLag_log2_Q7 = silk_lin2log( (opus_int32)prevLag );
+    } else {
+        prevLag_log2_Q7 = 0;
+    }
+    silk_assert( search_thres2_Q13 == silk_SAT16( search_thres2_Q13 ) );
+    /* Set up stage 2 codebook based on number of subframes */
+    if( nb_subfr == PE_MAX_NB_SUBFR ) {
+        cbk_size   = PE_NB_CBKS_STAGE2_EXT;
+        Lag_CB_ptr = &silk_CB_lags_stage2[ 0 ][ 0 ];
+        if( Fs_kHz == 8 && complexity > SILK_PE_MIN_COMPLEX ) {
+            /* If input is 8 khz use a larger codebook here because it is last stage */
+            nb_cbk_search = PE_NB_CBKS_STAGE2_EXT;
+        } else {
+            nb_cbk_search = PE_NB_CBKS_STAGE2;
+        }
+    } else {
+        cbk_size       = PE_NB_CBKS_STAGE2_10MS;
+        Lag_CB_ptr     = &silk_CB_lags_stage2_10_ms[ 0 ][ 0 ];
+        nb_cbk_search  = PE_NB_CBKS_STAGE2_10MS;
+    }
+
+    for( k = 0; k < length_d_srch; k++ ) {
+        d = d_srch[ k ];
+        for( j = 0; j < nb_cbk_search; j++ ) {
+            CC[ j ] = 0;
+            for( i = 0; i < nb_subfr; i++ ) {
+                opus_int d_subfr;
+                /* Try all codebooks */
+                d_subfr = d + matrix_ptr( Lag_CB_ptr, i, j, cbk_size );
+                CC[ j ] = CC[ j ]
+                    + (opus_int32)matrix_ptr( C, i,
+                                              d_subfr - ( MIN_LAG_8KHZ - 2 ),
+                                              CSTRIDE_8KHZ );
+            }
+        }
+        /* Find best codebook */
+        CCmax_new = silk_int32_MIN;
+        CBimax_new = 0;
+        for( i = 0; i < nb_cbk_search; i++ ) {
+            if( CC[ i ] > CCmax_new ) {
+                CCmax_new = CC[ i ];
+                CBimax_new = i;
+            }
+        }
+
+        /* Bias towards shorter lags */
+        lag_log2_Q7 = silk_lin2log( d ); /* Q7 */
+        silk_assert( lag_log2_Q7 == silk_SAT16( lag_log2_Q7 ) );
+        silk_assert( nb_subfr * SILK_FIX_CONST( PE_SHORTLAG_BIAS, 13 ) == silk_SAT16( nb_subfr * SILK_FIX_CONST( PE_SHORTLAG_BIAS, 13 ) ) );
+        CCmax_new_b = CCmax_new - silk_RSHIFT( silk_SMULBB( nb_subfr * SILK_FIX_CONST( PE_SHORTLAG_BIAS, 13 ), lag_log2_Q7 ), 7 ); /* Q13 */
+
+        /* Bias towards previous lag */
+        silk_assert( nb_subfr * SILK_FIX_CONST( PE_PREVLAG_BIAS, 13 ) == silk_SAT16( nb_subfr * SILK_FIX_CONST( PE_PREVLAG_BIAS, 13 ) ) );
+        if( prevLag > 0 ) {
+            delta_lag_log2_sqr_Q7 = lag_log2_Q7 - prevLag_log2_Q7;
+            silk_assert( delta_lag_log2_sqr_Q7 == silk_SAT16( delta_lag_log2_sqr_Q7 ) );
+            delta_lag_log2_sqr_Q7 = silk_RSHIFT( silk_SMULBB( delta_lag_log2_sqr_Q7, delta_lag_log2_sqr_Q7 ), 7 );
+            prev_lag_bias_Q13 = silk_RSHIFT( silk_SMULBB( nb_subfr * SILK_FIX_CONST( PE_PREVLAG_BIAS, 13 ), *LTPCorr_Q15 ), 15 ); /* Q13 */
+            prev_lag_bias_Q13 = silk_DIV32( silk_MUL( prev_lag_bias_Q13, delta_lag_log2_sqr_Q7 ), delta_lag_log2_sqr_Q7 + SILK_FIX_CONST( 0.5, 7 ) );
+            CCmax_new_b -= prev_lag_bias_Q13; /* Q13 */
+        }
+
+        if( CCmax_new_b > CCmax_b                                   &&  /* Find maximum biased correlation                  */
+            CCmax_new > silk_SMULBB( nb_subfr, search_thres2_Q13 )  &&  /* Correlation needs to be high enough to be voiced */
+            silk_CB_lags_stage2[ 0 ][ CBimax_new ] <= MIN_LAG_8KHZ      /* Lag must be in range                             */
+         ) {
+            CCmax_b = CCmax_new_b;
+            CCmax   = CCmax_new;
+            lag     = d;
+            CBimax  = CBimax_new;
+        }
+    }
+
+    if( lag == -1 ) {
+        /* No suitable candidate found */
+        silk_memset( pitch_out, 0, nb_subfr * sizeof( opus_int ) );
+        *LTPCorr_Q15  = 0;
+        *lagIndex     = 0;
+        *contourIndex = 0;
+        RESTORE_STACK;
+        return 1;
+    }
+
+    /* Output normalized correlation */
+    *LTPCorr_Q15 = (opus_int)silk_LSHIFT( silk_DIV32_16( CCmax, nb_subfr ), 2 );
+    silk_assert( *LTPCorr_Q15 >= 0 );
+
+    if( Fs_kHz > 8 ) {
+        VARDECL( opus_int16, scratch_mem );
+        /***************************************************************************/
+        /* Scale input signal down to avoid correlations measures from overflowing */
+        /***************************************************************************/
+        /* find scaling as max scaling for each subframe */
+        silk_sum_sqr_shift( &energy, &shift, frame, frame_length );
+        ALLOC( scratch_mem, shift > 0 ? frame_length : ALLOC_NONE, opus_int16 );
+        if( shift > 0 ) {
+            /* Move signal to scratch mem because the input signal should be unchanged */
+            shift = silk_RSHIFT( shift, 1 );
+            for( i = 0; i < frame_length; i++ ) {
+                scratch_mem[ i ] = silk_RSHIFT( frame[ i ], shift );
+            }
+            input_frame_ptr = scratch_mem;
+        } else {
+            input_frame_ptr = frame;
+        }
+
+        /* Search in original signal */
+
+        CBimax_old = CBimax;
+        /* Compensate for decimation */
+        silk_assert( lag == silk_SAT16( lag ) );
+        if( Fs_kHz == 12 ) {
+            lag = silk_RSHIFT( silk_SMULBB( lag, 3 ), 1 );
+        } else if( Fs_kHz == 16 ) {
+            lag = silk_LSHIFT( lag, 1 );
+        } else {
+            lag = silk_SMULBB( lag, 3 );
+        }
+
+        lag = silk_LIMIT_int( lag, min_lag, max_lag );
+        start_lag = silk_max_int( lag - 2, min_lag );
+        end_lag   = silk_min_int( lag + 2, max_lag );
+        lag_new   = lag;                                    /* to avoid undefined lag */
+        CBimax    = 0;                                      /* to avoid undefined lag */
+
+        CCmax = silk_int32_MIN;
+        /* pitch lags according to second stage */
+        for( k = 0; k < nb_subfr; k++ ) {
+            pitch_out[ k ] = lag + 2 * silk_CB_lags_stage2[ k ][ CBimax_old ];
+        }
+
+        /* Set up codebook parameters according to complexity setting and frame length */
+        if( nb_subfr == PE_MAX_NB_SUBFR ) {
+            nb_cbk_search   = (opus_int)silk_nb_cbk_searchs_stage3[ complexity ];
+            cbk_size        = PE_NB_CBKS_STAGE3_MAX;
+            Lag_CB_ptr      = &silk_CB_lags_stage3[ 0 ][ 0 ];
+        } else {
+            nb_cbk_search   = PE_NB_CBKS_STAGE3_10MS;
+            cbk_size        = PE_NB_CBKS_STAGE3_10MS;
+            Lag_CB_ptr      = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];
+        }
+
+        /* Calculate the correlations and energies needed in stage 3 */
+        ALLOC( energies_st3, nb_subfr * nb_cbk_search, silk_pe_stage3_vals );
+        ALLOC( cross_corr_st3, nb_subfr * nb_cbk_search, silk_pe_stage3_vals );
+        silk_P_Ana_calc_corr_st3(  cross_corr_st3, input_frame_ptr, start_lag, sf_length, nb_subfr, complexity, arch );
+        silk_P_Ana_calc_energy_st3( energies_st3, input_frame_ptr, start_lag, sf_length, nb_subfr, complexity );
+
+        lag_counter = 0;
+        silk_assert( lag == silk_SAT16( lag ) );
+        contour_bias_Q15 = silk_DIV32_16( SILK_FIX_CONST( PE_FLATCONTOUR_BIAS, 15 ), lag );
+
+        target_ptr = &input_frame_ptr[ PE_LTP_MEM_LENGTH_MS * Fs_kHz ];
+        energy_target = silk_ADD32( silk_inner_prod_aligned( target_ptr, target_ptr, nb_subfr * sf_length ), 1 );
+        for( d = start_lag; d <= end_lag; d++ ) {
+            for( j = 0; j < nb_cbk_search; j++ ) {
+                cross_corr = 0;
+                energy     = energy_target;
+                for( k = 0; k < nb_subfr; k++ ) {
+                    cross_corr = silk_ADD32( cross_corr,
+                        matrix_ptr( cross_corr_st3, k, j,
+                                    nb_cbk_search )[ lag_counter ] );
+                    energy     = silk_ADD32( energy,
+                        matrix_ptr( energies_st3, k, j,
+                                    nb_cbk_search )[ lag_counter ] );
+                    silk_assert( energy >= 0 );
+                }
+                if( cross_corr > 0 ) {
+                    CCmax_new = silk_DIV32_varQ( cross_corr, energy, 13 + 1 );          /* Q13 */
+                    /* Reduce depending on flatness of contour */
+                    diff = silk_int16_MAX - silk_MUL( contour_bias_Q15, j );            /* Q15 */
+                    silk_assert( diff == silk_SAT16( diff ) );
+                    CCmax_new = silk_SMULWB( CCmax_new, diff );                         /* Q14 */
+                } else {
+                    CCmax_new = 0;
+                }
+
+                if( CCmax_new > CCmax && ( d + silk_CB_lags_stage3[ 0 ][ j ] ) <= max_lag ) {
+                    CCmax   = CCmax_new;
+                    lag_new = d;
+                    CBimax  = j;
+                }
+            }
+            lag_counter++;
+        }
+
+        for( k = 0; k < nb_subfr; k++ ) {
+            pitch_out[ k ] = lag_new + matrix_ptr( Lag_CB_ptr, k, CBimax, cbk_size );
+            pitch_out[ k ] = silk_LIMIT( pitch_out[ k ], min_lag, PE_MAX_LAG_MS * Fs_kHz );
+        }
+        *lagIndex = (opus_int16)( lag_new - min_lag);
+        *contourIndex = (opus_int8)CBimax;
+    } else {        /* Fs_kHz == 8 */
+        /* Save Lags */
+        for( k = 0; k < nb_subfr; k++ ) {
+            pitch_out[ k ] = lag + matrix_ptr( Lag_CB_ptr, k, CBimax, cbk_size );
+            pitch_out[ k ] = silk_LIMIT( pitch_out[ k ], MIN_LAG_8KHZ, PE_MAX_LAG_MS * 8 );
+        }
+        *lagIndex = (opus_int16)( lag - MIN_LAG_8KHZ );
+        *contourIndex = (opus_int8)CBimax;
+    }
+    silk_assert( *lagIndex >= 0 );
+    /* return as voiced */
+    RESTORE_STACK;
+    return 0;
+}
+
+/***********************************************************************
+ * Calculates the correlations used in stage 3 search. In order to cover
+ * the whole lag codebook for all the searched offset lags (lag +- 2),
+ * the following correlations are needed in each sub frame:
+ *
+ * sf1: lag range [-8,...,7] total 16 correlations
+ * sf2: lag range [-4,...,4] total 9 correlations
+ * sf3: lag range [-3,....4] total 8 correltions
+ * sf4: lag range [-6,....8] total 15 correlations
+ *
+ * In total 48 correlations. The direct implementation computed in worst
+ * case 4*12*5 = 240 correlations, but more likely around 120.
+ ***********************************************************************/
+static void silk_P_Ana_calc_corr_st3(
+    silk_pe_stage3_vals cross_corr_st3[],              /* O 3 DIM correlation array */
+    const opus_int16  frame[],                         /* I vector to correlate         */
+    opus_int          start_lag,                       /* I lag offset to search around */
+    opus_int          sf_length,                       /* I length of a 5 ms subframe   */
+    opus_int          nb_subfr,                        /* I number of subframes         */
+    opus_int          complexity,                      /* I Complexity setting          */
+    int               arch                             /* I Run-time architecture       */
+)
+{
+    const opus_int16 *target_ptr;
+    opus_int   i, j, k, lag_counter, lag_low, lag_high;
+    opus_int   nb_cbk_search, delta, idx, cbk_size;
+    VARDECL( opus_int32, scratch_mem );
+    VARDECL( opus_int32, xcorr32 );
+    const opus_int8 *Lag_range_ptr, *Lag_CB_ptr;
+    SAVE_STACK;
+
+    silk_assert( complexity >= SILK_PE_MIN_COMPLEX );
+    silk_assert( complexity <= SILK_PE_MAX_COMPLEX );
+
+    if( nb_subfr == PE_MAX_NB_SUBFR ) {
+        Lag_range_ptr = &silk_Lag_range_stage3[ complexity ][ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3[ 0 ][ 0 ];
+        nb_cbk_search = silk_nb_cbk_searchs_stage3[ complexity ];
+        cbk_size      = PE_NB_CBKS_STAGE3_MAX;
+    } else {
+        silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1);
+        Lag_range_ptr = &silk_Lag_range_stage3_10_ms[ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];
+        nb_cbk_search = PE_NB_CBKS_STAGE3_10MS;
+        cbk_size      = PE_NB_CBKS_STAGE3_10MS;
+    }
+    ALLOC( scratch_mem, SCRATCH_SIZE, opus_int32 );
+    ALLOC( xcorr32, SCRATCH_SIZE, opus_int32 );
+
+    target_ptr = &frame[ silk_LSHIFT( sf_length, 2 ) ]; /* Pointer to middle of frame */
+    for( k = 0; k < nb_subfr; k++ ) {
+        lag_counter = 0;
+
+        /* Calculate the correlations for each subframe */
+        lag_low  = matrix_ptr( Lag_range_ptr, k, 0, 2 );
+        lag_high = matrix_ptr( Lag_range_ptr, k, 1, 2 );
+        silk_assert(lag_high-lag_low+1 <= SCRATCH_SIZE);
+        celt_pitch_xcorr( target_ptr, target_ptr - start_lag - lag_high, xcorr32, sf_length, lag_high - lag_low + 1, arch );
+        for( j = lag_low; j <= lag_high; j++ ) {
+            silk_assert( lag_counter < SCRATCH_SIZE );
+            scratch_mem[ lag_counter ] = xcorr32[ lag_high - j ];
+            lag_counter++;
+        }
+
+        delta = matrix_ptr( Lag_range_ptr, k, 0, 2 );
+        for( i = 0; i < nb_cbk_search; i++ ) {
+            /* Fill out the 3 dim array that stores the correlations for */
+            /* each code_book vector for each start lag */
+            idx = matrix_ptr( Lag_CB_ptr, k, i, cbk_size ) - delta;
+            for( j = 0; j < PE_NB_STAGE3_LAGS; j++ ) {
+                silk_assert( idx + j < SCRATCH_SIZE );
+                silk_assert( idx + j < lag_counter );
+                matrix_ptr( cross_corr_st3, k, i, nb_cbk_search )[ j ] =
+                    scratch_mem[ idx + j ];
+            }
+        }
+        target_ptr += sf_length;
+    }
+    RESTORE_STACK;
+}
+
+/********************************************************************/
+/* Calculate the energies for first two subframes. The energies are */
+/* calculated recursively.                                          */
+/********************************************************************/
+static void silk_P_Ana_calc_energy_st3(
+    silk_pe_stage3_vals energies_st3[],                 /* O 3 DIM energy array */
+    const opus_int16  frame[],                          /* I vector to calc energy in    */
+    opus_int          start_lag,                        /* I lag offset to search around */
+    opus_int          sf_length,                        /* I length of one 5 ms subframe */
+    opus_int          nb_subfr,                         /* I number of subframes         */
+    opus_int          complexity                        /* I Complexity setting          */
+)
+{
+    const opus_int16 *target_ptr, *basis_ptr;
+    opus_int32 energy;
+    opus_int   k, i, j, lag_counter;
+    opus_int   nb_cbk_search, delta, idx, cbk_size, lag_diff;
+    VARDECL( opus_int32, scratch_mem );
+    const opus_int8 *Lag_range_ptr, *Lag_CB_ptr;
+    SAVE_STACK;
+
+    silk_assert( complexity >= SILK_PE_MIN_COMPLEX );
+    silk_assert( complexity <= SILK_PE_MAX_COMPLEX );
+
+    if( nb_subfr == PE_MAX_NB_SUBFR ) {
+        Lag_range_ptr = &silk_Lag_range_stage3[ complexity ][ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3[ 0 ][ 0 ];
+        nb_cbk_search = silk_nb_cbk_searchs_stage3[ complexity ];
+        cbk_size      = PE_NB_CBKS_STAGE3_MAX;
+    } else {
+        silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1);
+        Lag_range_ptr = &silk_Lag_range_stage3_10_ms[ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];
+        nb_cbk_search = PE_NB_CBKS_STAGE3_10MS;
+        cbk_size      = PE_NB_CBKS_STAGE3_10MS;
+    }
+    ALLOC( scratch_mem, SCRATCH_SIZE, opus_int32 );
+
+    target_ptr = &frame[ silk_LSHIFT( sf_length, 2 ) ];
+    for( k = 0; k < nb_subfr; k++ ) {
+        lag_counter = 0;
+
+        /* Calculate the energy for first lag */
+        basis_ptr = target_ptr - ( start_lag + matrix_ptr( Lag_range_ptr, k, 0, 2 ) );
+        energy = silk_inner_prod_aligned( basis_ptr, basis_ptr, sf_length );
+        silk_assert( energy >= 0 );
+        scratch_mem[ lag_counter ] = energy;
+        lag_counter++;
+
+        lag_diff = ( matrix_ptr( Lag_range_ptr, k, 1, 2 ) -  matrix_ptr( Lag_range_ptr, k, 0, 2 ) + 1 );
+        for( i = 1; i < lag_diff; i++ ) {
+            /* remove part outside new window */
+            energy -= silk_SMULBB( basis_ptr[ sf_length - i ], basis_ptr[ sf_length - i ] );
+            silk_assert( energy >= 0 );
+
+            /* add part that comes into window */
+            energy = silk_ADD_SAT32( energy, silk_SMULBB( basis_ptr[ -i ], basis_ptr[ -i ] ) );
+            silk_assert( energy >= 0 );
+            silk_assert( lag_counter < SCRATCH_SIZE );
+            scratch_mem[ lag_counter ] = energy;
+            lag_counter++;
+        }
+
+        delta = matrix_ptr( Lag_range_ptr, k, 0, 2 );
+        for( i = 0; i < nb_cbk_search; i++ ) {
+            /* Fill out the 3 dim array that stores the correlations for    */
+            /* each code_book vector for each start lag                     */
+            idx = matrix_ptr( Lag_CB_ptr, k, i, cbk_size ) - delta;
+            for( j = 0; j < PE_NB_STAGE3_LAGS; j++ ) {
+                silk_assert( idx + j < SCRATCH_SIZE );
+                silk_assert( idx + j < lag_counter );
+                matrix_ptr( energies_st3, k, i, nb_cbk_search )[ j ] =
+                    scratch_mem[ idx + j ];
+                silk_assert(
+                    matrix_ptr( energies_st3, k, i, nb_cbk_search )[ j ] >= 0 );
+            }
+        }
+        target_ptr += sf_length;
+    }
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/fixed/prefilter_FIX.c b/drivers/opus/silk/fixed/prefilter_FIX.c
new file mode 100644
index 0000000000..0b027eb836
--- /dev/null
+++ b/drivers/opus/silk/fixed/prefilter_FIX.c
@@ -0,0 +1,209 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+
+/* Prefilter for finding Quantizer input signal */
+static OPUS_INLINE void silk_prefilt_FIX(
+    silk_prefilter_state_FIX    *P,                         /* I/O  state                               */
+    opus_int32                  st_res_Q12[],               /* I    short term residual signal          */
+    opus_int32                  xw_Q3[],                    /* O    prefiltered signal                  */
+    opus_int32                  HarmShapeFIRPacked_Q12,     /* I    Harmonic shaping coeficients        */
+    opus_int                    Tilt_Q14,                   /* I    Tilt shaping coeficient             */
+    opus_int32                  LF_shp_Q14,                 /* I    Low-frequancy shaping coeficients   */
+    opus_int                    lag,                        /* I    Lag for harmonic shaping            */
+    opus_int                    length                      /* I    Length of signals                   */
+);
+
+void silk_warped_LPC_analysis_filter_FIX(
+          opus_int32            state[],                    /* I/O  State [order + 1]                   */
+          opus_int32            res_Q2[],                   /* O    Residual signal [length]            */
+    const opus_int16            coef_Q13[],                 /* I    Coefficients [order]                */
+    const opus_int16            input[],                    /* I    Input signal [length]               */
+    const opus_int16            lambda_Q16,                 /* I    Warping factor                      */
+    const opus_int              length,                     /* I    Length of input signal              */
+    const opus_int              order                       /* I    Filter order (even)                 */
+)
+{
+    opus_int     n, i;
+    opus_int32   acc_Q11, tmp1, tmp2;
+
+    /* Order must be even */
+    silk_assert( ( order & 1 ) == 0 );
+
+    for( n = 0; n < length; n++ ) {
+        /* Output of lowpass section */
+        tmp2 = silk_SMLAWB( state[ 0 ], state[ 1 ], lambda_Q16 );
+        state[ 0 ] = silk_LSHIFT( input[ n ], 14 );
+        /* Output of allpass section */
+        tmp1 = silk_SMLAWB( state[ 1 ], state[ 2 ] - tmp2, lambda_Q16 );
+        state[ 1 ] = tmp2;
+        acc_Q11 = silk_RSHIFT( order, 1 );
+        acc_Q11 = silk_SMLAWB( acc_Q11, tmp2, coef_Q13[ 0 ] );
+        /* Loop over allpass sections */
+        for( i = 2; i < order; i += 2 ) {
+            /* Output of allpass section */
+            tmp2 = silk_SMLAWB( state[ i ], state[ i + 1 ] - tmp1, lambda_Q16 );
+            state[ i ] = tmp1;
+            acc_Q11 = silk_SMLAWB( acc_Q11, tmp1, coef_Q13[ i - 1 ] );
+            /* Output of allpass section */
+            tmp1 = silk_SMLAWB( state[ i + 1 ], state[ i + 2 ] - tmp2, lambda_Q16 );
+            state[ i + 1 ] = tmp2;
+            acc_Q11 = silk_SMLAWB( acc_Q11, tmp2, coef_Q13[ i ] );
+        }
+        state[ order ] = tmp1;
+        acc_Q11 = silk_SMLAWB( acc_Q11, tmp1, coef_Q13[ order - 1 ] );
+        res_Q2[ n ] = silk_LSHIFT( (opus_int32)input[ n ], 2 ) - silk_RSHIFT_ROUND( acc_Q11, 9 );
+    }
+}
+
+void silk_prefilter_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state                                                               */
+    const silk_encoder_control_FIX  *psEncCtrl,                             /* I    Encoder control                                                             */
+    opus_int32                      xw_Q3[],                                /* O    Weighted signal                                                             */
+    const opus_int16                x[]                                     /* I    Speech signal                                                               */
+)
+{
+    silk_prefilter_state_FIX *P = &psEnc->sPrefilt;
+    opus_int   j, k, lag;
+    opus_int32 tmp_32;
+    const opus_int16 *AR1_shp_Q13;
+    const opus_int16 *px;
+    opus_int32 *pxw_Q3;
+    opus_int   HarmShapeGain_Q12, Tilt_Q14;
+    opus_int32 HarmShapeFIRPacked_Q12, LF_shp_Q14;
+    VARDECL( opus_int32, x_filt_Q12 );
+    VARDECL( opus_int32, st_res_Q2 );
+    opus_int16 B_Q10[ 2 ];
+    SAVE_STACK;
+
+    /* Set up pointers */
+    px  = x;
+    pxw_Q3 = xw_Q3;
+    lag = P->lagPrev;
+    ALLOC( x_filt_Q12, psEnc->sCmn.subfr_length, opus_int32 );
+    ALLOC( st_res_Q2, psEnc->sCmn.subfr_length, opus_int32 );
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        /* Update Variables that change per sub frame */
+        if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+            lag = psEncCtrl->pitchL[ k ];
+        }
+
+        /* Noise shape parameters */
+        HarmShapeGain_Q12 = silk_SMULWB( (opus_int32)psEncCtrl->HarmShapeGain_Q14[ k ], 16384 - psEncCtrl->HarmBoost_Q14[ k ] );
+        silk_assert( HarmShapeGain_Q12 >= 0 );
+        HarmShapeFIRPacked_Q12  =                          silk_RSHIFT( HarmShapeGain_Q12, 2 );
+        HarmShapeFIRPacked_Q12 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q12, 1 ), 16 );
+        Tilt_Q14    = psEncCtrl->Tilt_Q14[   k ];
+        LF_shp_Q14  = psEncCtrl->LF_shp_Q14[ k ];
+        AR1_shp_Q13 = &psEncCtrl->AR1_Q13[   k * MAX_SHAPE_LPC_ORDER ];
+
+        /* Short term FIR filtering*/
+        silk_warped_LPC_analysis_filter_FIX( P->sAR_shp, st_res_Q2, AR1_shp_Q13, px,
+            psEnc->sCmn.warping_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.shapingLPCOrder );
+
+        /* Reduce (mainly) low frequencies during harmonic emphasis */
+        B_Q10[ 0 ] = silk_RSHIFT_ROUND( psEncCtrl->GainsPre_Q14[ k ], 4 );
+        tmp_32 = silk_SMLABB( SILK_FIX_CONST( INPUT_TILT, 26 ), psEncCtrl->HarmBoost_Q14[ k ], HarmShapeGain_Q12 );   /* Q26 */
+        tmp_32 = silk_SMLABB( tmp_32, psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( HIGH_RATE_INPUT_TILT, 12 ) );    /* Q26 */
+        tmp_32 = silk_SMULWB( tmp_32, -psEncCtrl->GainsPre_Q14[ k ] );                                                /* Q24 */
+        tmp_32 = silk_RSHIFT_ROUND( tmp_32, 14 );                                                                     /* Q10 */
+        B_Q10[ 1 ]= silk_SAT16( tmp_32 );
+        x_filt_Q12[ 0 ] = silk_MLA( silk_MUL( st_res_Q2[ 0 ], B_Q10[ 0 ] ), P->sHarmHP_Q2, B_Q10[ 1 ] );
+        for( j = 1; j < psEnc->sCmn.subfr_length; j++ ) {
+            x_filt_Q12[ j ] = silk_MLA( silk_MUL( st_res_Q2[ j ], B_Q10[ 0 ] ), st_res_Q2[ j - 1 ], B_Q10[ 1 ] );
+        }
+        P->sHarmHP_Q2 = st_res_Q2[ psEnc->sCmn.subfr_length - 1 ];
+
+        silk_prefilt_FIX( P, x_filt_Q12, pxw_Q3, HarmShapeFIRPacked_Q12, Tilt_Q14, LF_shp_Q14, lag, psEnc->sCmn.subfr_length );
+
+        px  += psEnc->sCmn.subfr_length;
+        pxw_Q3 += psEnc->sCmn.subfr_length;
+    }
+
+    P->lagPrev = psEncCtrl->pitchL[ psEnc->sCmn.nb_subfr - 1 ];
+    RESTORE_STACK;
+}
+
+/* Prefilter for finding Quantizer input signal */
+static OPUS_INLINE void silk_prefilt_FIX(
+    silk_prefilter_state_FIX    *P,                         /* I/O  state                               */
+    opus_int32                  st_res_Q12[],               /* I    short term residual signal          */
+    opus_int32                  xw_Q3[],                    /* O    prefiltered signal                  */
+    opus_int32                  HarmShapeFIRPacked_Q12,     /* I    Harmonic shaping coeficients        */
+    opus_int                    Tilt_Q14,                   /* I    Tilt shaping coeficient             */
+    opus_int32                  LF_shp_Q14,                 /* I    Low-frequancy shaping coeficients   */
+    opus_int                    lag,                        /* I    Lag for harmonic shaping            */
+    opus_int                    length                      /* I    Length of signals                   */
+)
+{
+    opus_int   i, idx, LTP_shp_buf_idx;
+    opus_int32 n_LTP_Q12, n_Tilt_Q10, n_LF_Q10;
+    opus_int32 sLF_MA_shp_Q12, sLF_AR_shp_Q12;
+    opus_int16 *LTP_shp_buf;
+
+    /* To speed up use temp variables instead of using the struct */
+    LTP_shp_buf     = P->sLTP_shp;
+    LTP_shp_buf_idx = P->sLTP_shp_buf_idx;
+    sLF_AR_shp_Q12  = P->sLF_AR_shp_Q12;
+    sLF_MA_shp_Q12  = P->sLF_MA_shp_Q12;
+
+    for( i = 0; i < length; i++ ) {
+        if( lag > 0 ) {
+            /* unrolled loop */
+            silk_assert( HARM_SHAPE_FIR_TAPS == 3 );
+            idx = lag + LTP_shp_buf_idx;
+            n_LTP_Q12 = silk_SMULBB(            LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 - 1) & LTP_MASK ], HarmShapeFIRPacked_Q12 );
+            n_LTP_Q12 = silk_SMLABT( n_LTP_Q12, LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2    ) & LTP_MASK ], HarmShapeFIRPacked_Q12 );
+            n_LTP_Q12 = silk_SMLABB( n_LTP_Q12, LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 + 1) & LTP_MASK ], HarmShapeFIRPacked_Q12 );
+        } else {
+            n_LTP_Q12 = 0;
+        }
+
+        n_Tilt_Q10 = silk_SMULWB( sLF_AR_shp_Q12, Tilt_Q14 );
+        n_LF_Q10   = silk_SMLAWB( silk_SMULWT( sLF_AR_shp_Q12, LF_shp_Q14 ), sLF_MA_shp_Q12, LF_shp_Q14 );
+
+        sLF_AR_shp_Q12 = silk_SUB32( st_res_Q12[ i ], silk_LSHIFT( n_Tilt_Q10, 2 ) );
+        sLF_MA_shp_Q12 = silk_SUB32( sLF_AR_shp_Q12,  silk_LSHIFT( n_LF_Q10,   2 ) );
+
+        LTP_shp_buf_idx = ( LTP_shp_buf_idx - 1 ) & LTP_MASK;
+        LTP_shp_buf[ LTP_shp_buf_idx ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sLF_MA_shp_Q12, 12 ) );
+
+        xw_Q3[i] = silk_RSHIFT_ROUND( silk_SUB32( sLF_MA_shp_Q12, n_LTP_Q12 ), 9 );
+    }
+
+    /* Copy temp variable back to state */
+    P->sLF_AR_shp_Q12   = sLF_AR_shp_Q12;
+    P->sLF_MA_shp_Q12   = sLF_MA_shp_Q12;
+    P->sLTP_shp_buf_idx = LTP_shp_buf_idx;
+}
diff --git a/drivers/opus/silk/fixed/process_gains_FIX.c b/drivers/opus/silk/fixed/process_gains_FIX.c
new file mode 100644
index 0000000000..3a78c475bb
--- /dev/null
+++ b/drivers/opus/silk/fixed/process_gains_FIX.c
@@ -0,0 +1,117 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "tuning_parameters.h"
+
+/* Processing of gains */
+void silk_process_gains_FIX(
+    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state                                                               */
+    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Encoder control                                                             */
+    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
+)
+{
+    silk_shape_state_FIX *psShapeSt = &psEnc->sShape;
+    opus_int     k;
+    opus_int32   s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart, quant_offset_Q10;
+
+    /* Gain reduction when LTP coding gain is high */
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /*s = -0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */
+        s_Q16 = -silk_sigm_Q15( silk_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - SILK_FIX_CONST( 12.0, 7 ), 4 ) );
+        for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+            psEncCtrl->Gains_Q16[ k ] = silk_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 );
+        }
+    }
+
+    /* Limit the quantized signal */
+    /* InvMaxSqrVal = pow( 2.0f, 0.33f * ( 21.0f - SNR_dB ) ) / subfr_length; */
+    InvMaxSqrVal_Q16 = silk_DIV32_16( silk_log2lin(
+        silk_SMULWB( SILK_FIX_CONST( 21 + 16 / 0.33, 7 ) - psEnc->sCmn.SNR_dB_Q7, SILK_FIX_CONST( 0.33, 16 ) ) ), psEnc->sCmn.subfr_length );
+
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        /* Soft limit on ratio residual energy and squared gains */
+        ResNrg     = psEncCtrl->ResNrg[ k ];
+        ResNrgPart = silk_SMULWW( ResNrg, InvMaxSqrVal_Q16 );
+        if( psEncCtrl->ResNrgQ[ k ] > 0 ) {
+            ResNrgPart = silk_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] );
+        } else {
+            if( ResNrgPart >= silk_RSHIFT( silk_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) {
+                ResNrgPart = silk_int32_MAX;
+            } else {
+                ResNrgPart = silk_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] );
+            }
+        }
+        gain = psEncCtrl->Gains_Q16[ k ];
+        gain_squared = silk_ADD_SAT32( ResNrgPart, silk_SMMUL( gain, gain ) );
+        if( gain_squared < silk_int16_MAX ) {
+            /* recalculate with higher precision */
+            gain_squared = silk_SMLAWW( silk_LSHIFT( ResNrgPart, 16 ), gain, gain );
+            silk_assert( gain_squared > 0 );
+            gain = silk_SQRT_APPROX( gain_squared );                    /* Q8   */
+            gain = silk_min( gain, silk_int32_MAX >> 8 );
+            psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 8 );   /* Q16  */
+        } else {
+            gain = silk_SQRT_APPROX( gain_squared );                    /* Q0   */
+            gain = silk_min( gain, silk_int32_MAX >> 16 );
+            psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 16 );  /* Q16  */
+        }
+    }
+
+    /* Save unquantized gains and gain Index */
+    silk_memcpy( psEncCtrl->GainsUnq_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
+    psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
+
+    /* Quantize gains */
+    silk_gains_quant( psEnc->sCmn.indices.GainsIndices, psEncCtrl->Gains_Q16,
+        &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+    /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        if( psEncCtrl->LTPredCodGain_Q7 + silk_RSHIFT( psEnc->sCmn.input_tilt_Q15, 8 ) > SILK_FIX_CONST( 1.0, 7 ) ) {
+            psEnc->sCmn.indices.quantOffsetType = 0;
+        } else {
+            psEnc->sCmn.indices.quantOffsetType = 1;
+        }
+    }
+
+    /* Quantizer boundary adjustment */
+    quant_offset_Q10 = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ];
+    psEncCtrl->Lambda_Q10 = SILK_FIX_CONST( LAMBDA_OFFSET, 10 )
+                          + silk_SMULBB( SILK_FIX_CONST( LAMBDA_DELAYED_DECISIONS, 10 ), psEnc->sCmn.nStatesDelayedDecision )
+                          + silk_SMULWB( SILK_FIX_CONST( LAMBDA_SPEECH_ACT,        18 ), psEnc->sCmn.speech_activity_Q8     )
+                          + silk_SMULWB( SILK_FIX_CONST( LAMBDA_INPUT_QUALITY,     12 ), psEncCtrl->input_quality_Q14       )
+                          + silk_SMULWB( SILK_FIX_CONST( LAMBDA_CODING_QUALITY,    12 ), psEncCtrl->coding_quality_Q14      )
+                          + silk_SMULWB( SILK_FIX_CONST( LAMBDA_QUANT_OFFSET,      16 ), quant_offset_Q10                   );
+
+    silk_assert( psEncCtrl->Lambda_Q10 > 0 );
+    silk_assert( psEncCtrl->Lambda_Q10 < SILK_FIX_CONST( 2, 10 ) );
+}
diff --git a/drivers/opus/silk/fixed/regularize_correlations_FIX.c b/drivers/opus/silk/fixed/regularize_correlations_FIX.c
new file mode 100644
index 0000000000..a3378fdd17
--- /dev/null
+++ b/drivers/opus/silk/fixed/regularize_correlations_FIX.c
@@ -0,0 +1,47 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+
+/* Add noise to matrix diagonal */
+void silk_regularize_correlations_FIX(
+    opus_int32                      *XX,                                    /* I/O  Correlation matrices                                                        */
+    opus_int32                      *xx,                                    /* I/O  Correlation values                                                          */
+    opus_int32                      noise,                                  /* I    Noise to add                                                                */
+    opus_int                        D                                       /* I    Dimension of XX                                                             */
+)
+{
+    opus_int i;
+    for( i = 0; i < D; i++ ) {
+        matrix_ptr( &XX[ 0 ], i, i, D ) = silk_ADD32( matrix_ptr( &XX[ 0 ], i, i, D ), noise );
+    }
+    xx[ 0 ] += noise;
+}
diff --git a/drivers/opus/silk/fixed/residual_energy16_FIX.c b/drivers/opus/silk/fixed/residual_energy16_FIX.c
new file mode 100644
index 0000000000..39bdff2a72
--- /dev/null
+++ b/drivers/opus/silk/fixed/residual_energy16_FIX.c
@@ -0,0 +1,103 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+
+/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
+opus_int32 silk_residual_energy16_covar_FIX(
+    const opus_int16                *c,                                     /* I    Prediction vector                                                           */
+    const opus_int32                *wXX,                                   /* I    Correlation matrix                                                          */
+    const opus_int32                *wXx,                                   /* I    Correlation vector                                                          */
+    opus_int32                      wxx,                                    /* I    Signal energy                                                               */
+    opus_int                        D,                                      /* I    Dimension                                                                   */
+    opus_int                        cQ                                      /* I    Q value for c vector 0 - 15                                                 */
+)
+{
+    opus_int   i, j, lshifts, Qxtra;
+    opus_int32 c_max, w_max, tmp, tmp2, nrg;
+    opus_int   cn[ MAX_MATRIX_SIZE ];
+    const opus_int32 *pRow;
+
+    /* Safety checks */
+    silk_assert( D >=  0 );
+    silk_assert( D <= 16 );
+    silk_assert( cQ >  0 );
+    silk_assert( cQ < 16 );
+
+    lshifts = 16 - cQ;
+    Qxtra = lshifts;
+
+    c_max = 0;
+    for( i = 0; i < D; i++ ) {
+        c_max = silk_max_32( c_max, silk_abs( (opus_int32)c[ i ] ) );
+    }
+    Qxtra = silk_min_int( Qxtra, silk_CLZ32( c_max ) - 17 );
+
+    w_max = silk_max_32( wXX[ 0 ], wXX[ D * D - 1 ] );
+    Qxtra = silk_min_int( Qxtra, silk_CLZ32( silk_MUL( D, silk_RSHIFT( silk_SMULWB( w_max, c_max ), 4 ) ) ) - 5 );
+    Qxtra = silk_max_int( Qxtra, 0 );
+    for( i = 0; i < D; i++ ) {
+        cn[ i ] = silk_LSHIFT( ( opus_int )c[ i ], Qxtra );
+        silk_assert( silk_abs(cn[i]) <= ( silk_int16_MAX + 1 ) ); /* Check that silk_SMLAWB can be used */
+    }
+    lshifts -= Qxtra;
+
+    /* Compute wxx - 2 * wXx * c */
+    tmp = 0;
+    for( i = 0; i < D; i++ ) {
+        tmp = silk_SMLAWB( tmp, wXx[ i ], cn[ i ] );
+    }
+    nrg = silk_RSHIFT( wxx, 1 + lshifts ) - tmp;                         /* Q: -lshifts - 1 */
+
+    /* Add c' * wXX * c, assuming wXX is symmetric */
+    tmp2 = 0;
+    for( i = 0; i < D; i++ ) {
+        tmp = 0;
+        pRow = &wXX[ i * D ];
+        for( j = i + 1; j < D; j++ ) {
+            tmp = silk_SMLAWB( tmp, pRow[ j ], cn[ j ] );
+        }
+        tmp  = silk_SMLAWB( tmp,  silk_RSHIFT( pRow[ i ], 1 ), cn[ i ] );
+        tmp2 = silk_SMLAWB( tmp2, tmp,                        cn[ i ] );
+    }
+    nrg = silk_ADD_LSHIFT32( nrg, tmp2, lshifts );                       /* Q: -lshifts - 1 */
+
+    /* Keep one bit free always, because we add them for LSF interpolation */
+    if( nrg < 1 ) {
+        nrg = 1;
+    } else if( nrg > silk_RSHIFT( silk_int32_MAX, lshifts + 2 ) ) {
+        nrg = silk_int32_MAX >> 1;
+    } else {
+        nrg = silk_LSHIFT( nrg, lshifts + 1 );                           /* Q0 */
+    }
+    return nrg;
+
+}
diff --git a/drivers/opus/silk/fixed/residual_energy_FIX.c b/drivers/opus/silk/fixed/residual_energy_FIX.c
new file mode 100644
index 0000000000..13dbc51e39
--- /dev/null
+++ b/drivers/opus/silk/fixed/residual_energy_FIX.c
@@ -0,0 +1,97 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+
+/* Calculates residual energies of input subframes where all subframes have LPC_order   */
+/* of preceding samples                                                                 */
+void silk_residual_energy_FIX(
+          opus_int32                nrgs[ MAX_NB_SUBFR ],                   /* O    Residual energy per subframe                                                */
+          opus_int                  nrgsQ[ MAX_NB_SUBFR ],                  /* O    Q value per subframe                                                        */
+    const opus_int16                x[],                                    /* I    Input signal                                                                */
+          opus_int16                a_Q12[ 2 ][ MAX_LPC_ORDER ],            /* I    AR coefs for each frame half                                                */
+    const opus_int32                gains[ MAX_NB_SUBFR ],                  /* I    Quantization gains                                                          */
+    const opus_int                  subfr_length,                           /* I    Subframe length                                                             */
+    const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
+    const opus_int                  LPC_order                               /* I    LPC order                                                                   */
+)
+{
+    opus_int         offset, i, j, rshift, lz1, lz2;
+    opus_int16       *LPC_res_ptr;
+    VARDECL( opus_int16, LPC_res );
+    const opus_int16 *x_ptr;
+    opus_int32       tmp32;
+    SAVE_STACK;
+
+    x_ptr  = x;
+    offset = LPC_order + subfr_length;
+
+    /* Filter input to create the LPC residual for each frame half, and measure subframe energies */
+    ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 );
+    silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr );
+    for( i = 0; i < nb_subfr >> 1; i++ ) {
+        /* Calculate half frame LPC residual signal including preceding samples */
+        silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order );
+
+        /* Point to first subframe of the just calculated LPC residual signal */
+        LPC_res_ptr = LPC_res + LPC_order;
+        for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) {
+            /* Measure subframe energy */
+            silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length );
+
+            /* Set Q values for the measured energy */
+            nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift;
+
+            /* Move to next subframe */
+            LPC_res_ptr += offset;
+        }
+        /* Move to next frame half */
+        x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset;
+    }
+
+    /* Apply the squared subframe gains */
+    for( i = 0; i < nb_subfr; i++ ) {
+        /* Fully upscale gains and energies */
+        lz1 = silk_CLZ32( nrgs[  i ] ) - 1;
+        lz2 = silk_CLZ32( gains[ i ] ) - 1;
+
+        tmp32 = silk_LSHIFT32( gains[ i ], lz2 );
+
+        /* Find squared gains */
+        tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/
+
+        /* Scale energies */
+        nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/
+        nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32;
+    }
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/fixed/schur64_FIX.c b/drivers/opus/silk/fixed/schur64_FIX.c
new file mode 100644
index 0000000000..22c0952ffd
--- /dev/null
+++ b/drivers/opus/silk/fixed/schur64_FIX.c
@@ -0,0 +1,92 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Slower than schur(), but more accurate.                              */
+/* Uses SMULL(), available on armv4                                     */
+opus_int32 silk_schur64(                            /* O    returns residual energy                                     */
+    opus_int32                  rc_Q16[],           /* O    Reflection coefficients [order] Q16                         */
+    const opus_int32            c[],                /* I    Correlations [order+1]                                      */
+    opus_int32                  order               /* I    Prediction order                                            */
+)
+{
+    opus_int   k, n;
+    opus_int32 C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ];
+    opus_int32 Ctmp1_Q30, Ctmp2_Q30, rc_tmp_Q31;
+
+    silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 );
+
+    /* Check for invalid input */
+    if( c[ 0 ] <= 0 ) {
+        silk_memset( rc_Q16, 0, order * sizeof( opus_int32 ) );
+        return 0;
+    }
+
+    for( k = 0; k < order + 1; k++ ) {
+        C[ k ][ 0 ] = C[ k ][ 1 ] = c[ k ];
+    }
+
+    for( k = 0; k < order; k++ ) {
+        /* Check that we won't be getting an unstable rc, otherwise stop here. */
+        if (silk_abs_int32(C[ k + 1 ][ 0 ]) >= C[ 0 ][ 1 ]) {
+           if ( C[ k + 1 ][ 0 ] > 0 ) {
+              rc_Q16[ k ] = -SILK_FIX_CONST( .99f, 16 );
+           } else {
+              rc_Q16[ k ] = SILK_FIX_CONST( .99f, 16 );
+           }
+           k++;
+           break;
+        }
+
+        /* Get reflection coefficient: divide two Q30 values and get result in Q31 */
+        rc_tmp_Q31 = silk_DIV32_varQ( -C[ k + 1 ][ 0 ], C[ 0 ][ 1 ], 31 );
+
+        /* Save the output */
+        rc_Q16[ k ] = silk_RSHIFT_ROUND( rc_tmp_Q31, 15 );
+
+        /* Update correlations */
+        for( n = 0; n < order - k; n++ ) {
+            Ctmp1_Q30 = C[ n + k + 1 ][ 0 ];
+            Ctmp2_Q30 = C[ n ][ 1 ];
+
+            /* Multiply and add the highest int32 */
+            C[ n + k + 1 ][ 0 ] = Ctmp1_Q30 + silk_SMMUL( silk_LSHIFT( Ctmp2_Q30, 1 ), rc_tmp_Q31 );
+            C[ n ][ 1 ]         = Ctmp2_Q30 + silk_SMMUL( silk_LSHIFT( Ctmp1_Q30, 1 ), rc_tmp_Q31 );
+        }
+    }
+
+    for(; k < order; k++ ) {
+       rc_Q16[ k ] = 0;
+    }
+
+    return silk_max_32( 1, C[ 0 ][ 1 ] );
+}
diff --git a/drivers/opus/silk/fixed/schur_FIX.c b/drivers/opus/silk/fixed/schur_FIX.c
new file mode 100644
index 0000000000..e8b24cf068
--- /dev/null
+++ b/drivers/opus/silk/fixed/schur_FIX.c
@@ -0,0 +1,106 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Faster than schur64(), but much less accurate.                       */
+/* uses SMLAWB(), requiring armv5E and higher.                          */
+opus_int32 silk_schur(                              /* O    Returns residual energy                                     */
+    opus_int16                  *rc_Q15,            /* O    reflection coefficients [order] Q15                         */
+    const opus_int32            *c,                 /* I    correlations [order+1]                                      */
+    const opus_int32            order               /* I    prediction order                                            */
+)
+{
+    opus_int        k, n, lz;
+    opus_int32    C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ];
+    opus_int32    Ctmp1, Ctmp2, rc_tmp_Q15;
+
+    silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 );
+
+    /* Get number of leading zeros */
+    lz = silk_CLZ32( c[ 0 ] );
+
+    /* Copy correlations and adjust level to Q30 */
+    if( lz < 2 ) {
+        /* lz must be 1, so shift one to the right */
+        for( k = 0; k < order + 1; k++ ) {
+            C[ k ][ 0 ] = C[ k ][ 1 ] = silk_RSHIFT( c[ k ], 1 );
+        }
+    } else if( lz > 2 ) {
+        /* Shift to the left */
+        lz -= 2;
+        for( k = 0; k < order + 1; k++ ) {
+            C[ k ][ 0 ] = C[ k ][ 1 ] = silk_LSHIFT( c[ k ], lz );
+        }
+    } else {
+        /* No need to shift */
+        for( k = 0; k < order + 1; k++ ) {
+            C[ k ][ 0 ] = C[ k ][ 1 ] = c[ k ];
+        }
+    }
+
+    for( k = 0; k < order; k++ ) {
+        /* Check that we won't be getting an unstable rc, otherwise stop here. */
+        if (silk_abs_int32(C[ k + 1 ][ 0 ]) >= C[ 0 ][ 1 ]) {
+           if ( C[ k + 1 ][ 0 ] > 0 ) {
+              rc_Q15[ k ] = -SILK_FIX_CONST( .99f, 15 );
+           } else {
+              rc_Q15[ k ] = SILK_FIX_CONST( .99f, 15 );
+           }
+           k++;
+           break;
+        }
+
+        /* Get reflection coefficient */
+        rc_tmp_Q15 = -silk_DIV32_16( C[ k + 1 ][ 0 ], silk_max_32( silk_RSHIFT( C[ 0 ][ 1 ], 15 ), 1 ) );
+
+        /* Clip (shouldn't happen for properly conditioned inputs) */
+        rc_tmp_Q15 = silk_SAT16( rc_tmp_Q15 );
+
+        /* Store */
+        rc_Q15[ k ] = (opus_int16)rc_tmp_Q15;
+
+        /* Update correlations */
+        for( n = 0; n < order - k; n++ ) {
+            Ctmp1 = C[ n + k + 1 ][ 0 ];
+            Ctmp2 = C[ n ][ 1 ];
+            C[ n + k + 1 ][ 0 ] = silk_SMLAWB( Ctmp1, silk_LSHIFT( Ctmp2, 1 ), rc_tmp_Q15 );
+            C[ n ][ 1 ]         = silk_SMLAWB( Ctmp2, silk_LSHIFT( Ctmp1, 1 ), rc_tmp_Q15 );
+        }
+    }
+
+    for(; k < order; k++ ) {
+       rc_Q15[ k ] = 0;
+    }
+
+    /* return residual energy */
+    return silk_max_32( 1, C[ 0 ][ 1 ] );
+}
diff --git a/drivers/opus/silk/fixed/solve_LS_FIX.c b/drivers/opus/silk/fixed/solve_LS_FIX.c
new file mode 100644
index 0000000000..5d09284935
--- /dev/null
+++ b/drivers/opus/silk/fixed/solve_LS_FIX.c
@@ -0,0 +1,249 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+#include "stack_alloc.h"
+#include "tuning_parameters.h"
+
+/*****************************/
+/* Internal function headers */
+/*****************************/
+
+typedef struct {
+    opus_int32 Q36_part;
+    opus_int32 Q48_part;
+} inv_D_t;
+
+/* Factorize square matrix A into LDL form */
+static OPUS_INLINE void silk_LDL_factorize_FIX(
+    opus_int32          *A,         /* I/O Pointer to Symetric Square Matrix                            */
+    opus_int            M,          /* I   Size of Matrix                                               */
+    opus_int32          *L_Q16,     /* I/O Pointer to Square Upper triangular Matrix                    */
+    inv_D_t             *inv_D      /* I/O Pointer to vector holding inverted diagonal elements of D    */
+);
+
+/* Solve Lx = b, when L is lower triangular and has ones on the diagonal */
+static OPUS_INLINE void silk_LS_SolveFirst_FIX(
+    const opus_int32    *L_Q16,     /* I    Pointer to Lower Triangular Matrix                          */
+    opus_int            M,          /* I    Dim of Matrix equation                                      */
+    const opus_int32    *b,         /* I    b Vector                                                    */
+    opus_int32          *x_Q16      /* O    x Vector                                                    */
+);
+
+/* Solve L^t*x = b, where L is lower triangular with ones on the diagonal */
+static OPUS_INLINE void silk_LS_SolveLast_FIX(
+    const opus_int32    *L_Q16,     /* I    Pointer to Lower Triangular Matrix                          */
+    const opus_int      M,          /* I    Dim of Matrix equation                                      */
+    const opus_int32    *b,         /* I    b Vector                                                    */
+    opus_int32          *x_Q16      /* O    x Vector                                                    */
+);
+
+static OPUS_INLINE void silk_LS_divide_Q16_FIX(
+    opus_int32          T[],        /* I/O  Numenator vector                                            */
+    inv_D_t             *inv_D,     /* I    1 / D vector                                                */
+    opus_int            M           /* I    dimension                                                   */
+);
+
+/* Solves Ax = b, assuming A is symmetric */
+void silk_solve_LDL_FIX(
+    opus_int32                      *A,                                     /* I    Pointer to symetric square matrix A                                         */
+    opus_int                        M,                                      /* I    Size of matrix                                                              */
+    const opus_int32                *b,                                     /* I    Pointer to b vector                                                         */
+    opus_int32                      *x_Q16                                  /* O    Pointer to x solution vector                                                */
+)
+{
+    VARDECL( opus_int32, L_Q16 );
+    opus_int32 Y[      MAX_MATRIX_SIZE ];
+    inv_D_t   inv_D[  MAX_MATRIX_SIZE ];
+    SAVE_STACK;
+
+    silk_assert( M <= MAX_MATRIX_SIZE );
+    ALLOC( L_Q16, M * M, opus_int32 );
+
+    /***************************************************
+    Factorize A by LDL such that A = L*D*L',
+    where L is lower triangular with ones on diagonal
+    ****************************************************/
+    silk_LDL_factorize_FIX( A, M, L_Q16, inv_D );
+
+    /****************************************************
+    * substitute D*L'*x = Y. ie:
+    L*D*L'*x = b => L*Y = b <=> Y = inv(L)*b
+    ******************************************************/
+    silk_LS_SolveFirst_FIX( L_Q16, M, b, Y );
+
+    /****************************************************
+    D*L'*x = Y <=> L'*x = inv(D)*Y, because D is
+    diagonal just multiply with 1/d_i
+    ****************************************************/
+    silk_LS_divide_Q16_FIX( Y, inv_D, M );
+
+    /****************************************************
+    x = inv(L') * inv(D) * Y
+    *****************************************************/
+    silk_LS_SolveLast_FIX( L_Q16, M, Y, x_Q16 );
+    RESTORE_STACK;
+}
+
+static OPUS_INLINE void silk_LDL_factorize_FIX(
+    opus_int32          *A,         /* I/O Pointer to Symetric Square Matrix                            */
+    opus_int            M,          /* I   Size of Matrix                                               */
+    opus_int32          *L_Q16,     /* I/O Pointer to Square Upper triangular Matrix                    */
+    inv_D_t             *inv_D      /* I/O Pointer to vector holding inverted diagonal elements of D    */
+)
+{
+    opus_int   i, j, k, status, loop_count;
+    const opus_int32 *ptr1, *ptr2;
+    opus_int32 diag_min_value, tmp_32, err;
+    opus_int32 v_Q0[ MAX_MATRIX_SIZE ], D_Q0[ MAX_MATRIX_SIZE ];
+    opus_int32 one_div_diag_Q36, one_div_diag_Q40, one_div_diag_Q48;
+
+    silk_assert( M <= MAX_MATRIX_SIZE );
+
+    status = 1;
+    diag_min_value = silk_max_32( silk_SMMUL( silk_ADD_SAT32( A[ 0 ], A[ silk_SMULBB( M, M ) - 1 ] ), SILK_FIX_CONST( FIND_LTP_COND_FAC, 31 ) ), 1 << 9 );
+    for( loop_count = 0; loop_count < M && status == 1; loop_count++ ) {
+        status = 0;
+        for( j = 0; j < M; j++ ) {
+            ptr1 = matrix_adr( L_Q16, j, 0, M );
+            tmp_32 = 0;
+            for( i = 0; i < j; i++ ) {
+                v_Q0[ i ] = silk_SMULWW(         D_Q0[ i ], ptr1[ i ] ); /* Q0 */
+                tmp_32    = silk_SMLAWW( tmp_32, v_Q0[ i ], ptr1[ i ] ); /* Q0 */
+            }
+            tmp_32 = silk_SUB32( matrix_ptr( A, j, j, M ), tmp_32 );
+
+            if( tmp_32 < diag_min_value ) {
+                tmp_32 = silk_SUB32( silk_SMULBB( loop_count + 1, diag_min_value ), tmp_32 );
+                /* Matrix not positive semi-definite, or ill conditioned */
+                for( i = 0; i < M; i++ ) {
+                    matrix_ptr( A, i, i, M ) = silk_ADD32( matrix_ptr( A, i, i, M ), tmp_32 );
+                }
+                status = 1;
+                break;
+            }
+            D_Q0[ j ] = tmp_32;                         /* always < max(Correlation) */
+
+            /* two-step division */
+            one_div_diag_Q36 = silk_INVERSE32_varQ( tmp_32, 36 );                    /* Q36 */
+            one_div_diag_Q40 = silk_LSHIFT( one_div_diag_Q36, 4 );                   /* Q40 */
+            err = silk_SUB32( (opus_int32)1 << 24, silk_SMULWW( tmp_32, one_div_diag_Q40 ) );     /* Q24 */
+            one_div_diag_Q48 = silk_SMULWW( err, one_div_diag_Q40 );                 /* Q48 */
+
+            /* Save 1/Ds */
+            inv_D[ j ].Q36_part = one_div_diag_Q36;
+            inv_D[ j ].Q48_part = one_div_diag_Q48;
+
+            matrix_ptr( L_Q16, j, j, M ) = 65536; /* 1.0 in Q16 */
+            ptr1 = matrix_adr( A, j, 0, M );
+            ptr2 = matrix_adr( L_Q16, j + 1, 0, M );
+            for( i = j + 1; i < M; i++ ) {
+                tmp_32 = 0;
+                for( k = 0; k < j; k++ ) {
+                    tmp_32 = silk_SMLAWW( tmp_32, v_Q0[ k ], ptr2[ k ] ); /* Q0 */
+                }
+                tmp_32 = silk_SUB32( ptr1[ i ], tmp_32 ); /* always < max(Correlation) */
+
+                /* tmp_32 / D_Q0[j] : Divide to Q16 */
+                matrix_ptr( L_Q16, i, j, M ) = silk_ADD32( silk_SMMUL( tmp_32, one_div_diag_Q48 ),
+                    silk_RSHIFT( silk_SMULWW( tmp_32, one_div_diag_Q36 ), 4 ) );
+
+                /* go to next column */
+                ptr2 += M;
+            }
+        }
+    }
+
+    silk_assert( status == 0 );
+}
+
+static OPUS_INLINE void silk_LS_divide_Q16_FIX(
+    opus_int32          T[],        /* I/O  Numenator vector                                            */
+    inv_D_t             *inv_D,     /* I    1 / D vector                                                */
+    opus_int            M           /* I    dimension                                                   */
+)
+{
+    opus_int   i;
+    opus_int32 tmp_32;
+    opus_int32 one_div_diag_Q36, one_div_diag_Q48;
+
+    for( i = 0; i < M; i++ ) {
+        one_div_diag_Q36 = inv_D[ i ].Q36_part;
+        one_div_diag_Q48 = inv_D[ i ].Q48_part;
+
+        tmp_32 = T[ i ];
+        T[ i ] = silk_ADD32( silk_SMMUL( tmp_32, one_div_diag_Q48 ), silk_RSHIFT( silk_SMULWW( tmp_32, one_div_diag_Q36 ), 4 ) );
+    }
+}
+
+/* Solve Lx = b, when L is lower triangular and has ones on the diagonal */
+static OPUS_INLINE void silk_LS_SolveFirst_FIX(
+    const opus_int32    *L_Q16,     /* I    Pointer to Lower Triangular Matrix                          */
+    opus_int            M,          /* I    Dim of Matrix equation                                      */
+    const opus_int32    *b,         /* I    b Vector                                                    */
+    opus_int32          *x_Q16      /* O    x Vector                                                    */
+)
+{
+    opus_int i, j;
+    const opus_int32 *ptr32;
+    opus_int32 tmp_32;
+
+    for( i = 0; i < M; i++ ) {
+        ptr32 = matrix_adr( L_Q16, i, 0, M );
+        tmp_32 = 0;
+        for( j = 0; j < i; j++ ) {
+            tmp_32 = silk_SMLAWW( tmp_32, ptr32[ j ], x_Q16[ j ] );
+        }
+        x_Q16[ i ] = silk_SUB32( b[ i ], tmp_32 );
+    }
+}
+
+/* Solve L^t*x = b, where L is lower triangular with ones on the diagonal */
+static OPUS_INLINE void silk_LS_SolveLast_FIX(
+    const opus_int32    *L_Q16,     /* I    Pointer to Lower Triangular Matrix                          */
+    const opus_int      M,          /* I    Dim of Matrix equation                                      */
+    const opus_int32    *b,         /* I    b Vector                                                    */
+    opus_int32          *x_Q16      /* O    x Vector                                                    */
+)
+{
+    opus_int i, j;
+    const opus_int32 *ptr32;
+    opus_int32 tmp_32;
+
+    for( i = M - 1; i >= 0; i-- ) {
+        ptr32 = matrix_adr( L_Q16, 0, i, M );
+        tmp_32 = 0;
+        for( j = M - 1; j > i; j-- ) {
+            tmp_32 = silk_SMLAWW( tmp_32, ptr32[ silk_SMULBB( j, M ) ], x_Q16[ j ] );
+        }
+        x_Q16[ i ] = silk_SUB32( b[ i ], tmp_32 );
+    }
+}
diff --git a/drivers/opus/silk/fixed/structs_FIX.h b/drivers/opus/silk/fixed/structs_FIX.h
new file mode 100644
index 0000000000..0284dfa27a
--- /dev/null
+++ b/drivers/opus/silk/fixed/structs_FIX.h
@@ -0,0 +1,133 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_STRUCTS_FIX_H
+#define SILK_STRUCTS_FIX_H
+
+#include "typedef.h"
+#include "silk_main.h"
+#include "structs.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/********************************/
+/* Noise shaping analysis state */
+/********************************/
+typedef struct {
+    opus_int8                   LastGainIndex;
+    opus_int32                  HarmBoost_smth_Q16;
+    opus_int32                  HarmShapeGain_smth_Q16;
+    opus_int32                  Tilt_smth_Q16;
+} silk_shape_state_FIX;
+
+/********************************/
+/* Prefilter state              */
+/********************************/
+typedef struct {
+    opus_int16                  sLTP_shp[ LTP_BUF_LENGTH ];
+    opus_int32                  sAR_shp[ MAX_SHAPE_LPC_ORDER + 1 ];
+    opus_int                    sLTP_shp_buf_idx;
+    opus_int32                  sLF_AR_shp_Q12;
+    opus_int32                  sLF_MA_shp_Q12;
+    opus_int32                  sHarmHP_Q2;
+    opus_int32                  rand_seed;
+    opus_int                    lagPrev;
+} silk_prefilter_state_FIX;
+
+/********************************/
+/* Encoder state FIX            */
+/********************************/
+typedef struct {
+    silk_encoder_state          sCmn;                                   /* Common struct, shared with floating-point code       */
+    silk_shape_state_FIX        sShape;                                 /* Shape state                                          */
+    silk_prefilter_state_FIX    sPrefilt;                               /* Prefilter State                                      */
+
+    /* Buffer for find pitch and noise shape analysis */
+    silk_DWORD_ALIGN opus_int16 x_buf[ 2 * MAX_FRAME_LENGTH + LA_SHAPE_MAX ];/* Buffer for find pitch and noise shape analysis  */
+    opus_int                    LTPCorr_Q15;                            /* Normalized correlation from pitch lag estimator      */
+} silk_encoder_state_FIX;
+
+/************************/
+/* Encoder control FIX  */
+/************************/
+typedef struct {
+    /* Prediction and coding parameters */
+    opus_int32                  Gains_Q16[ MAX_NB_SUBFR ];
+    silk_DWORD_ALIGN opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ];
+    opus_int16                  LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ];
+    opus_int                    LTP_scale_Q14;
+    opus_int                    pitchL[ MAX_NB_SUBFR ];
+
+    /* Noise shaping parameters */
+    /* Testing */
+    silk_DWORD_ALIGN opus_int16 AR1_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ];
+    silk_DWORD_ALIGN opus_int16 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ];
+    opus_int32                  LF_shp_Q14[        MAX_NB_SUBFR ];      /* Packs two int16 coefficients per int32 value         */
+    opus_int                    GainsPre_Q14[      MAX_NB_SUBFR ];
+    opus_int                    HarmBoost_Q14[     MAX_NB_SUBFR ];
+    opus_int                    Tilt_Q14[          MAX_NB_SUBFR ];
+    opus_int                    HarmShapeGain_Q14[ MAX_NB_SUBFR ];
+    opus_int                    Lambda_Q10;
+    opus_int                    input_quality_Q14;
+    opus_int                    coding_quality_Q14;
+
+    /* measures */
+    opus_int                    sparseness_Q8;
+    opus_int32                  predGain_Q16;
+    opus_int                    LTPredCodGain_Q7;
+    opus_int32                  ResNrg[ MAX_NB_SUBFR ];                 /* Residual energy per subframe                         */
+    opus_int                    ResNrgQ[ MAX_NB_SUBFR ];                /* Q domain for the residual energy > 0                 */
+
+    /* Parameters for CBR mode */
+    opus_int32                  GainsUnq_Q16[ MAX_NB_SUBFR ];
+    opus_int8                   lastGainIndexPrev;
+} silk_encoder_control_FIX;
+
+/************************/
+/* Encoder Super Struct */
+/************************/
+typedef struct {
+    silk_encoder_state_FIX      state_Fxx[ ENCODER_NUM_CHANNELS ];
+    stereo_enc_state            sStereo;
+    opus_int32                  nBitsExceeded;
+    opus_int                    nChannelsAPI;
+    opus_int                    nChannelsInternal;
+    opus_int                    nPrevChannelsInternal;
+    opus_int                    timeSinceSwitchAllowed_ms;
+    opus_int                    allowBandwidthSwitch;
+    opus_int                    prev_decode_only_middle;
+} silk_encoder;
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/fixed/vector_ops_FIX.c b/drivers/opus/silk/fixed/vector_ops_FIX.c
new file mode 100644
index 0000000000..b1e422eb91
--- /dev/null
+++ b/drivers/opus/silk/fixed/vector_ops_FIX.c
@@ -0,0 +1,96 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Copy and multiply a vector by a constant */
+void silk_scale_copy_vector16(
+    opus_int16                  *data_out,
+    const opus_int16            *data_in,
+    opus_int32                  gain_Q16,           /* I    Gain in Q16                                                 */
+    const opus_int              dataSize            /* I    Length                                                      */
+)
+{
+    opus_int  i;
+    opus_int32 tmp32;
+
+    for( i = 0; i < dataSize; i++ ) {
+        tmp32 = silk_SMULWB( gain_Q16, data_in[ i ] );
+        data_out[ i ] = (opus_int16)silk_CHECK_FIT16( tmp32 );
+    }
+}
+
+/* Multiply a vector by a constant */
+void silk_scale_vector32_Q26_lshift_18(
+    opus_int32                  *data1,             /* I/O  Q0/Q18                                                      */
+    opus_int32                  gain_Q26,           /* I    Q26                                                         */
+    opus_int                    dataSize            /* I    length                                                      */
+)
+{
+    opus_int  i;
+
+    for( i = 0; i < dataSize; i++ ) {
+        data1[ i ] = (opus_int32)silk_CHECK_FIT32( silk_RSHIFT64( silk_SMULL( data1[ i ], gain_Q26 ), 8 ) );    /* OUTPUT: Q18 */
+    }
+}
+
+/* sum = for(i=0;i<len;i++)inVec1[i]*inVec2[i];      ---        inner product   */
+/* Note for ARM asm:                                                            */
+/*        * inVec1 and inVec2 should be at least 2 byte aligned.                */
+/*        * len should be positive 16bit integer.                               */
+/*        * only when len>6, memory access can be reduced by half.              */
+opus_int32 silk_inner_prod_aligned(
+    const opus_int16 *const     inVec1,             /*    I input vector 1                                              */
+    const opus_int16 *const     inVec2,             /*    I input vector 2                                              */
+    const opus_int              len                 /*    I vector lengths                                              */
+)
+{
+    opus_int   i;
+    opus_int32 sum = 0;
+    for( i = 0; i < len; i++ ) {
+        sum = silk_SMLABB( sum, inVec1[ i ], inVec2[ i ] );
+    }
+    return sum;
+}
+
+opus_int64 silk_inner_prod16_aligned_64(
+    const opus_int16            *inVec1,            /*    I input vector 1                                              */
+    const opus_int16            *inVec2,            /*    I input vector 2                                              */
+    const opus_int              len                 /*    I vector lengths                                              */
+)
+{
+    opus_int   i;
+    opus_int64 sum = 0;
+    for( i = 0; i < len; i++ ) {
+        sum = silk_SMLALBB( sum, inVec1[ i ], inVec2[ i ] );
+    }
+    return sum;
+}
diff --git a/drivers/opus/silk/fixed/warped_autocorrelation_FIX.c b/drivers/opus/silk/fixed/warped_autocorrelation_FIX.c
new file mode 100644
index 0000000000..3f04df775c
--- /dev/null
+++ b/drivers/opus/silk/fixed/warped_autocorrelation_FIX.c
@@ -0,0 +1,88 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FIX.h"
+
+#define QC  10
+#define QS  14
+
+/* Autocorrelations for a warped frequency axis */
+void silk_warped_autocorrelation_FIX(
+          opus_int32                *corr,                                  /* O    Result [order + 1]                                                          */
+          opus_int                  *scale,                                 /* O    Scaling of the correlation vector                                           */
+    const opus_int16                *input,                                 /* I    Input data to correlate                                                     */
+    const opus_int                  warping_Q16,                            /* I    Warping coefficient                                                         */
+    const opus_int                  length,                                 /* I    Length of input                                                             */
+    const opus_int                  order                                   /* I    Correlation order (even)                                                    */
+)
+{
+    opus_int   n, i, lsh;
+    opus_int32 tmp1_QS, tmp2_QS;
+    opus_int32 state_QS[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
+    opus_int64 corr_QC[  MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
+
+    /* Order must be even */
+    silk_assert( ( order & 1 ) == 0 );
+    silk_assert( 2 * QS - QC >= 0 );
+
+    /* Loop over samples */
+    for( n = 0; n < length; n++ ) {
+        tmp1_QS = silk_LSHIFT32( (opus_int32)input[ n ], QS );
+        /* Loop over allpass sections */
+        for( i = 0; i < order; i += 2 ) {
+            /* Output of allpass section */
+            tmp2_QS = silk_SMLAWB( state_QS[ i ], state_QS[ i + 1 ] - tmp1_QS, warping_Q16 );
+            state_QS[ i ]  = tmp1_QS;
+            corr_QC[  i ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
+            /* Output of allpass section */
+            tmp1_QS = silk_SMLAWB( state_QS[ i + 1 ], state_QS[ i + 2 ] - tmp2_QS, warping_Q16 );
+            state_QS[ i + 1 ]  = tmp2_QS;
+            corr_QC[  i + 1 ] += silk_RSHIFT64( silk_SMULL( tmp2_QS, state_QS[ 0 ] ), 2 * QS - QC );
+        }
+        state_QS[ order ] = tmp1_QS;
+        corr_QC[  order ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
+    }
+
+    lsh = silk_CLZ64( corr_QC[ 0 ] ) - 35;
+    lsh = silk_LIMIT( lsh, -12 - QC, 30 - QC );
+    *scale = -( QC + lsh );
+    silk_assert( *scale >= -30 && *scale <= 12 );
+    if( lsh >= 0 ) {
+        for( i = 0; i < order + 1; i++ ) {
+            corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_LSHIFT64( corr_QC[ i ], lsh ) );
+        }
+    } else {
+        for( i = 0; i < order + 1; i++ ) {
+            corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_RSHIFT64( corr_QC[ i ], -lsh ) );
+        }
+    }
+    silk_assert( corr_QC[ 0 ] >= 0 ); /* If breaking, decrease QC*/
+}
diff --git a/drivers/opus/silk/float/LPC_analysis_filter_FLP.c b/drivers/opus/silk/float/LPC_analysis_filter_FLP.c
new file mode 100644
index 0000000000..8d26c093bf
--- /dev/null
+++ b/drivers/opus/silk/float/LPC_analysis_filter_FLP.c
@@ -0,0 +1,249 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include <stdlib.h>
+#include "main_FLP.h"
+
+/************************************************/
+/* LPC analysis filter                          */
+/* NB! State is kept internally and the         */
+/* filter always starts with zero state         */
+/* first Order output samples are set to zero   */
+/************************************************/
+
+/* 16th order LPC analysis filter, does not write first 16 samples */
+static OPUS_INLINE void silk_LPC_analysis_filter16_FLP(
+          silk_float                 r_LPC[],            /* O    LPC residual signal                     */
+    const silk_float                 PredCoef[],         /* I    LPC coefficients                        */
+    const silk_float                 s[],                /* I    Input signal                            */
+    const opus_int                   length              /* I    Length of input signal                  */
+)
+{
+    opus_int   ix;
+    silk_float LPC_pred;
+    const silk_float *s_ptr;
+
+    for( ix = 16; ix < length; ix++ ) {
+        s_ptr = &s[ix - 1];
+
+        /* short-term prediction */
+        LPC_pred = s_ptr[  0 ]  * PredCoef[ 0 ]  +
+                   s_ptr[ -1 ]  * PredCoef[ 1 ]  +
+                   s_ptr[ -2 ]  * PredCoef[ 2 ]  +
+                   s_ptr[ -3 ]  * PredCoef[ 3 ]  +
+                   s_ptr[ -4 ]  * PredCoef[ 4 ]  +
+                   s_ptr[ -5 ]  * PredCoef[ 5 ]  +
+                   s_ptr[ -6 ]  * PredCoef[ 6 ]  +
+                   s_ptr[ -7 ]  * PredCoef[ 7 ]  +
+                   s_ptr[ -8 ]  * PredCoef[ 8 ]  +
+                   s_ptr[ -9 ]  * PredCoef[ 9 ]  +
+                   s_ptr[ -10 ] * PredCoef[ 10 ] +
+                   s_ptr[ -11 ] * PredCoef[ 11 ] +
+                   s_ptr[ -12 ] * PredCoef[ 12 ] +
+                   s_ptr[ -13 ] * PredCoef[ 13 ] +
+                   s_ptr[ -14 ] * PredCoef[ 14 ] +
+                   s_ptr[ -15 ] * PredCoef[ 15 ];
+
+        /* prediction error */
+        r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
+    }
+}
+
+/* 12th order LPC analysis filter, does not write first 12 samples */
+static OPUS_INLINE void silk_LPC_analysis_filter12_FLP(
+          silk_float                 r_LPC[],            /* O    LPC residual signal                     */
+    const silk_float                 PredCoef[],         /* I    LPC coefficients                        */
+    const silk_float                 s[],                /* I    Input signal                            */
+    const opus_int                   length              /* I    Length of input signal                  */
+)
+{
+    opus_int   ix;
+    silk_float LPC_pred;
+    const silk_float *s_ptr;
+
+    for( ix = 12; ix < length; ix++ ) {
+        s_ptr = &s[ix - 1];
+
+        /* short-term prediction */
+        LPC_pred = s_ptr[  0 ]  * PredCoef[ 0 ]  +
+                   s_ptr[ -1 ]  * PredCoef[ 1 ]  +
+                   s_ptr[ -2 ]  * PredCoef[ 2 ]  +
+                   s_ptr[ -3 ]  * PredCoef[ 3 ]  +
+                   s_ptr[ -4 ]  * PredCoef[ 4 ]  +
+                   s_ptr[ -5 ]  * PredCoef[ 5 ]  +
+                   s_ptr[ -6 ]  * PredCoef[ 6 ]  +
+                   s_ptr[ -7 ]  * PredCoef[ 7 ]  +
+                   s_ptr[ -8 ]  * PredCoef[ 8 ]  +
+                   s_ptr[ -9 ]  * PredCoef[ 9 ]  +
+                   s_ptr[ -10 ] * PredCoef[ 10 ] +
+                   s_ptr[ -11 ] * PredCoef[ 11 ];
+
+        /* prediction error */
+        r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
+    }
+}
+
+/* 10th order LPC analysis filter, does not write first 10 samples */
+static OPUS_INLINE void silk_LPC_analysis_filter10_FLP(
+          silk_float                 r_LPC[],            /* O    LPC residual signal                     */
+    const silk_float                 PredCoef[],         /* I    LPC coefficients                        */
+    const silk_float                 s[],                /* I    Input signal                            */
+    const opus_int                   length              /* I    Length of input signal                  */
+)
+{
+    opus_int   ix;
+    silk_float LPC_pred;
+    const silk_float *s_ptr;
+
+    for( ix = 10; ix < length; ix++ ) {
+        s_ptr = &s[ix - 1];
+
+        /* short-term prediction */
+        LPC_pred = s_ptr[  0 ] * PredCoef[ 0 ]  +
+                   s_ptr[ -1 ] * PredCoef[ 1 ]  +
+                   s_ptr[ -2 ] * PredCoef[ 2 ]  +
+                   s_ptr[ -3 ] * PredCoef[ 3 ]  +
+                   s_ptr[ -4 ] * PredCoef[ 4 ]  +
+                   s_ptr[ -5 ] * PredCoef[ 5 ]  +
+                   s_ptr[ -6 ] * PredCoef[ 6 ]  +
+                   s_ptr[ -7 ] * PredCoef[ 7 ]  +
+                   s_ptr[ -8 ] * PredCoef[ 8 ]  +
+                   s_ptr[ -9 ] * PredCoef[ 9 ];
+
+        /* prediction error */
+        r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
+    }
+}
+
+/* 8th order LPC analysis filter, does not write first 8 samples */
+static OPUS_INLINE void silk_LPC_analysis_filter8_FLP(
+          silk_float                 r_LPC[],            /* O    LPC residual signal                     */
+    const silk_float                 PredCoef[],         /* I    LPC coefficients                        */
+    const silk_float                 s[],                /* I    Input signal                            */
+    const opus_int                   length              /* I    Length of input signal                  */
+)
+{
+    opus_int   ix;
+    silk_float LPC_pred;
+    const silk_float *s_ptr;
+
+    for( ix = 8; ix < length; ix++ ) {
+        s_ptr = &s[ix - 1];
+
+        /* short-term prediction */
+        LPC_pred = s_ptr[  0 ] * PredCoef[ 0 ]  +
+                   s_ptr[ -1 ] * PredCoef[ 1 ]  +
+                   s_ptr[ -2 ] * PredCoef[ 2 ]  +
+                   s_ptr[ -3 ] * PredCoef[ 3 ]  +
+                   s_ptr[ -4 ] * PredCoef[ 4 ]  +
+                   s_ptr[ -5 ] * PredCoef[ 5 ]  +
+                   s_ptr[ -6 ] * PredCoef[ 6 ]  +
+                   s_ptr[ -7 ] * PredCoef[ 7 ];
+
+        /* prediction error */
+        r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
+    }
+}
+
+/* 6th order LPC analysis filter, does not write first 6 samples */
+static OPUS_INLINE void silk_LPC_analysis_filter6_FLP(
+          silk_float                 r_LPC[],            /* O    LPC residual signal                     */
+    const silk_float                 PredCoef[],         /* I    LPC coefficients                        */
+    const silk_float                 s[],                /* I    Input signal                            */
+    const opus_int                   length              /* I    Length of input signal                  */
+)
+{
+    opus_int   ix;
+    silk_float LPC_pred;
+    const silk_float *s_ptr;
+
+    for( ix = 6; ix < length; ix++ ) {
+        s_ptr = &s[ix - 1];
+
+        /* short-term prediction */
+        LPC_pred = s_ptr[  0 ] * PredCoef[ 0 ]  +
+                   s_ptr[ -1 ] * PredCoef[ 1 ]  +
+                   s_ptr[ -2 ] * PredCoef[ 2 ]  +
+                   s_ptr[ -3 ] * PredCoef[ 3 ]  +
+                   s_ptr[ -4 ] * PredCoef[ 4 ]  +
+                   s_ptr[ -5 ] * PredCoef[ 5 ];
+
+        /* prediction error */
+        r_LPC[ix] = s_ptr[ 1 ] - LPC_pred;
+    }
+}
+
+/************************************************/
+/* LPC analysis filter                          */
+/* NB! State is kept internally and the         */
+/* filter always starts with zero state         */
+/* first Order output samples are set to zero   */
+/************************************************/
+void silk_LPC_analysis_filter_FLP(
+    silk_float                      r_LPC[],                            /* O    LPC residual signal                         */
+    const silk_float                PredCoef[],                         /* I    LPC coefficients                            */
+    const silk_float                s[],                                /* I    Input signal                                */
+    const opus_int                  length,                             /* I    Length of input signal                      */
+    const opus_int                  Order                               /* I    LPC order                                   */
+)
+{
+    silk_assert( Order <= length );
+
+    switch( Order ) {
+        case 6:
+            silk_LPC_analysis_filter6_FLP(  r_LPC, PredCoef, s, length );
+        break;
+
+        case 8:
+            silk_LPC_analysis_filter8_FLP(  r_LPC, PredCoef, s, length );
+        break;
+
+        case 10:
+            silk_LPC_analysis_filter10_FLP( r_LPC, PredCoef, s, length );
+        break;
+
+        case 12:
+            silk_LPC_analysis_filter12_FLP( r_LPC, PredCoef, s, length );
+        break;
+
+        case 16:
+            silk_LPC_analysis_filter16_FLP( r_LPC, PredCoef, s, length );
+        break;
+
+        default:
+            silk_assert( 0 );
+        break;
+    }
+
+    /* Set first Order output samples to zero */
+    silk_memset( r_LPC, 0, Order * sizeof( silk_float ) );
+}
+
diff --git a/drivers/opus/silk/float/LPC_inv_pred_gain_FLP.c b/drivers/opus/silk/float/LPC_inv_pred_gain_FLP.c
new file mode 100644
index 0000000000..968edfb189
--- /dev/null
+++ b/drivers/opus/silk/float/LPC_inv_pred_gain_FLP.c
@@ -0,0 +1,76 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "SigProc_FLP.h"
+
+#define RC_THRESHOLD        0.9999f
+
+/* compute inverse of LPC prediction gain, and                          */
+/* test if LPC coefficients are stable (all poles within unit circle)   */
+/* this code is based on silk_a2k_FLP()                                 */
+silk_float silk_LPC_inverse_pred_gain_FLP(  /* O    return inverse prediction gain, energy domain               */
+    const silk_float    *A,                 /* I    prediction coefficients [order]                             */
+    opus_int32          order               /* I    prediction order                                            */
+)
+{
+    opus_int   k, n;
+    double     invGain, rc, rc_mult1, rc_mult2;
+    silk_float Atmp[ 2 ][ SILK_MAX_ORDER_LPC ];
+    silk_float *Aold, *Anew;
+
+    Anew = Atmp[ order & 1 ];
+    silk_memcpy( Anew, A, order * sizeof(silk_float) );
+
+    invGain = 1.0;
+    for( k = order - 1; k > 0; k-- ) {
+        rc = -Anew[ k ];
+        if( rc > RC_THRESHOLD || rc < -RC_THRESHOLD ) {
+            return 0.0f;
+        }
+        rc_mult1 = 1.0f - rc * rc;
+        rc_mult2 = 1.0f / rc_mult1;
+        invGain *= rc_mult1;
+        /* swap pointers */
+        Aold = Anew;
+        Anew = Atmp[ k & 1 ];
+        for( n = 0; n < k; n++ ) {
+            Anew[ n ] = (silk_float)( ( Aold[ n ] - Aold[ k - n - 1 ] * rc ) * rc_mult2 );
+        }
+    }
+    rc = -Anew[ 0 ];
+    if( rc > RC_THRESHOLD || rc < -RC_THRESHOLD ) {
+        return 0.0f;
+    }
+    rc_mult1 = 1.0f - rc * rc;
+    invGain *= rc_mult1;
+    return (silk_float)invGain;
+}
diff --git a/drivers/opus/silk/float/LTP_analysis_filter_FLP.c b/drivers/opus/silk/float/LTP_analysis_filter_FLP.c
new file mode 100644
index 0000000000..fc729e99b1
--- /dev/null
+++ b/drivers/opus/silk/float/LTP_analysis_filter_FLP.c
@@ -0,0 +1,75 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+void silk_LTP_analysis_filter_FLP(
+    silk_float                      *LTP_res,                           /* O    LTP res MAX_NB_SUBFR*(pre_lgth+subfr_lngth) */
+    const silk_float                *x,                                 /* I    Input signal, with preceding samples        */
+    const silk_float                B[ LTP_ORDER * MAX_NB_SUBFR ],      /* I    LTP coefficients for each subframe          */
+    const opus_int                  pitchL[   MAX_NB_SUBFR ],           /* I    Pitch lags                                  */
+    const silk_float                invGains[ MAX_NB_SUBFR ],           /* I    Inverse quantization gains                  */
+    const opus_int                  subfr_length,                       /* I    Length of each subframe                     */
+    const opus_int                  nb_subfr,                           /* I    number of subframes                         */
+    const opus_int                  pre_length                          /* I    Preceding samples for each subframe         */
+)
+{
+    const silk_float *x_ptr, *x_lag_ptr;
+    silk_float   Btmp[ LTP_ORDER ];
+    silk_float   *LTP_res_ptr;
+    silk_float   inv_gain;
+    opus_int     k, i, j;
+
+    x_ptr = x;
+    LTP_res_ptr = LTP_res;
+    for( k = 0; k < nb_subfr; k++ ) {
+        x_lag_ptr = x_ptr - pitchL[ k ];
+        inv_gain = invGains[ k ];
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            Btmp[ i ] = B[ k * LTP_ORDER + i ];
+        }
+
+        /* LTP analysis FIR filter */
+        for( i = 0; i < subfr_length + pre_length; i++ ) {
+            LTP_res_ptr[ i ] = x_ptr[ i ];
+            /* Subtract long-term prediction */
+            for( j = 0; j < LTP_ORDER; j++ ) {
+                LTP_res_ptr[ i ] -= Btmp[ j ] * x_lag_ptr[ LTP_ORDER / 2 - j ];
+            }
+            LTP_res_ptr[ i ] *= inv_gain;
+            x_lag_ptr++;
+        }
+
+        /* Update pointers */
+        LTP_res_ptr += subfr_length + pre_length;
+        x_ptr       += subfr_length;
+    }
+}
diff --git a/drivers/opus/silk/float/LTP_scale_ctrl_FLP.c b/drivers/opus/silk/float/LTP_scale_ctrl_FLP.c
new file mode 100644
index 0000000000..60e1119d5a
--- /dev/null
+++ b/drivers/opus/silk/float/LTP_scale_ctrl_FLP.c
@@ -0,0 +1,52 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+void silk_LTP_scale_ctrl_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    opus_int                        condCoding                          /* I    The type of conditional coding to use       */
+)
+{
+    opus_int   round_loss;
+
+    if( condCoding == CODE_INDEPENDENTLY ) {
+        /* Only scale if first frame in packet */
+        round_loss = psEnc->sCmn.PacketLoss_perc + psEnc->sCmn.nFramesPerPacket;
+        psEnc->sCmn.indices.LTP_scaleIndex = (opus_int8)silk_LIMIT( round_loss * psEncCtrl->LTPredCodGain * 0.1f, 0.0f, 2.0f );
+    } else {
+        /* Default is minimum scaling */
+        psEnc->sCmn.indices.LTP_scaleIndex = 0;
+    }
+
+    psEncCtrl->LTP_scale = (silk_float)silk_LTPScales_table_Q14[ psEnc->sCmn.indices.LTP_scaleIndex ] / 16384.0f;
+}
diff --git a/drivers/opus/silk/float/SigProc_FLP.h b/drivers/opus/silk/float/SigProc_FLP.h
new file mode 100644
index 0000000000..f0cb3733be
--- /dev/null
+++ b/drivers/opus/silk/float/SigProc_FLP.h
@@ -0,0 +1,204 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_SIGPROC_FLP_H
+#define SILK_SIGPROC_FLP_H
+
+#include "SigProc_FIX.h"
+#include "float_cast.h"
+#include <math.h>
+
+#ifdef  __cplusplus
+extern "C"
+{
+#endif
+
+/********************************************************************/
+/*                    SIGNAL PROCESSING FUNCTIONS                   */
+/********************************************************************/
+
+/* Chirp (bw expand) LP AR filter */
+void silk_bwexpander_FLP(
+    silk_float          *ar,                /* I/O  AR filter to be expanded (without leading 1)                */
+    const opus_int      d,                  /* I    length of ar                                                */
+    const silk_float    chirp               /* I    chirp factor (typically in range (0..1) )                   */
+);
+
+/* compute inverse of LPC prediction gain, and                          */
+/* test if LPC coefficients are stable (all poles within unit circle)   */
+/* this code is based on silk_FLP_a2k()                                 */
+silk_float silk_LPC_inverse_pred_gain_FLP(  /* O    return inverse prediction gain, energy domain               */
+    const silk_float    *A,                 /* I    prediction coefficients [order]                             */
+    opus_int32          order               /* I    prediction order                                            */
+);
+
+silk_float silk_schur_FLP(                  /* O    returns residual energy                                     */
+    silk_float          refl_coef[],        /* O    reflection coefficients (length order)                      */
+    const silk_float    auto_corr[],        /* I    autocorrelation sequence (length order+1)                   */
+    opus_int            order               /* I    order                                                       */
+);
+
+void silk_k2a_FLP(
+    silk_float          *A,                 /* O     prediction coefficients [order]                            */
+    const silk_float    *rc,                /* I     reflection coefficients [order]                            */
+    opus_int32          order               /* I     prediction order                                           */
+);
+
+/* Solve the normal equations using the Levinson-Durbin recursion */
+silk_float silk_levinsondurbin_FLP(         /* O    prediction error energy                                     */
+    silk_float          A[],                /* O    prediction coefficients [order]                             */
+    const silk_float    corr[],             /* I    input auto-correlations [order + 1]                         */
+    const opus_int      order               /* I    prediction order                                            */
+);
+
+/* compute autocorrelation */
+void silk_autocorrelation_FLP(
+    silk_float          *results,           /* O    result (length correlationCount)                            */
+    const silk_float    *inputData,         /* I    input data to correlate                                     */
+    opus_int            inputDataSize,      /* I    length of input                                             */
+    opus_int            correlationCount    /* I    number of correlation taps to compute                       */
+);
+
+opus_int silk_pitch_analysis_core_FLP(      /* O    Voicing estimate: 0 voiced, 1 unvoiced                      */
+    const silk_float    *frame,             /* I    Signal of length PE_FRAME_LENGTH_MS*Fs_kHz                  */
+    opus_int            *pitch_out,         /* O    Pitch lag values [nb_subfr]                                 */
+    opus_int16          *lagIndex,          /* O    Lag Index                                                   */
+    opus_int8           *contourIndex,      /* O    Pitch contour Index                                         */
+    silk_float          *LTPCorr,           /* I/O  Normalized correlation; input: value from previous frame    */
+    opus_int            prevLag,            /* I    Last lag of previous frame; set to zero is unvoiced         */
+    const silk_float    search_thres1,      /* I    First stage threshold for lag candidates 0 - 1              */
+    const silk_float    search_thres2,      /* I    Final threshold for lag candidates 0 - 1                    */
+    const opus_int      Fs_kHz,             /* I    sample frequency (kHz)                                      */
+    const opus_int      complexity,         /* I    Complexity setting, 0-2, where 2 is highest                 */
+    const opus_int      nb_subfr,           /* I    Number of 5 ms subframes                                    */
+    int                 arch                /* I    Run-time architecture                                       */
+);
+
+void silk_insertion_sort_decreasing_FLP(
+    silk_float          *a,                 /* I/O  Unsorted / Sorted vector                                    */
+    opus_int            *idx,               /* O    Index vector for the sorted elements                        */
+    const opus_int      L,                  /* I    Vector length                                               */
+    const opus_int      K                   /* I    Number of correctly sorted positions                        */
+);
+
+/* Compute reflection coefficients from input signal */
+silk_float silk_burg_modified_FLP(          /* O    returns residual energy                                     */
+    silk_float          A[],                /* O    prediction coefficients (length order)                      */
+    const silk_float    x[],                /* I    input signal, length: nb_subfr*(D+L_sub)                    */
+    const silk_float    minInvGain,         /* I    minimum inverse prediction gain                             */
+    const opus_int      subfr_length,       /* I    input signal subframe length (incl. D preceding samples)    */
+    const opus_int      nb_subfr,           /* I    number of subframes stacked in x                            */
+    const opus_int      D                   /* I    order                                                       */
+);
+
+/* multiply a vector by a constant */
+void silk_scale_vector_FLP(
+    silk_float          *data1,
+    silk_float          gain,
+    opus_int            dataSize
+);
+
+/* copy and multiply a vector by a constant */
+void silk_scale_copy_vector_FLP(
+    silk_float          *data_out,
+    const silk_float    *data_in,
+    silk_float          gain,
+    opus_int            dataSize
+);
+
+/* inner product of two silk_float arrays, with result as double */
+double silk_inner_product_FLP(
+    const silk_float    *data1,
+    const silk_float    *data2,
+    opus_int            dataSize
+);
+
+/* sum of squares of a silk_float array, with result as double */
+double silk_energy_FLP(
+    const silk_float    *data,
+    opus_int            dataSize
+);
+
+/********************************************************************/
+/*                                MACROS                            */
+/********************************************************************/
+
+#define PI              (3.1415926536f)
+
+#define silk_min_float( a, b )                  (((a) < (b)) ? (a) :  (b))
+#define silk_max_float( a, b )                  (((a) > (b)) ? (a) :  (b))
+#define silk_abs_float( a )                     ((silk_float)fabs(a))
+
+/* sigmoid function */
+static OPUS_INLINE silk_float silk_sigmoid( silk_float x )
+{
+    return (silk_float)(1.0 / (1.0 + exp(-x)));
+}
+
+/* floating-point to integer conversion (rounding) */
+static OPUS_INLINE opus_int32 silk_float2int( silk_float x )
+{
+    return (opus_int32)float2int( x );
+}
+
+/* floating-point to integer conversion (rounding) */
+static OPUS_INLINE void silk_float2short_array(
+    opus_int16       *out,
+    const silk_float *in,
+    opus_int32       length
+)
+{
+    opus_int32 k;
+    for( k = length - 1; k >= 0; k-- ) {
+        out[k] = silk_SAT16( (opus_int32)float2int( in[k] ) );
+    }
+}
+
+/* integer to floating-point conversion */
+static OPUS_INLINE void silk_short2float_array(
+    silk_float       *out,
+    const opus_int16 *in,
+    opus_int32       length
+)
+{
+    opus_int32 k;
+    for( k = length - 1; k >= 0; k-- ) {
+        out[k] = (silk_float)in[k];
+    }
+}
+
+/* using log2() helps the fixed-point conversion */
+static OPUS_INLINE silk_float silk_log2( double x )
+{
+    return ( silk_float )( 3.32192809488736 * log10( x ) );
+}
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* SILK_SIGPROC_FLP_H */
diff --git a/drivers/opus/silk/float/apply_sine_window_FLP.c b/drivers/opus/silk/float/apply_sine_window_FLP.c
new file mode 100644
index 0000000000..d904585d17
--- /dev/null
+++ b/drivers/opus/silk/float/apply_sine_window_FLP.c
@@ -0,0 +1,81 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+/* Apply sine window to signal vector   */
+/* Window types:                        */
+/*  1 -> sine window from 0 to pi/2     */
+/*  2 -> sine window from pi/2 to pi    */
+void silk_apply_sine_window_FLP(
+    silk_float                      px_win[],                           /* O    Pointer to windowed signal                  */
+    const silk_float                px[],                               /* I    Pointer to input signal                     */
+    const opus_int                  win_type,                           /* I    Selects a window type                       */
+    const opus_int                  length                              /* I    Window length, multiple of 4                */
+)
+{
+    opus_int   k;
+    silk_float freq, c, S0, S1;
+
+    silk_assert( win_type == 1 || win_type == 2 );
+
+    /* Length must be multiple of 4 */
+    silk_assert( ( length & 3 ) == 0 );
+
+    freq = PI / ( length + 1 );
+
+    /* Approximation of 2 * cos(f) */
+    c = 2.0f - freq * freq;
+
+    /* Initialize state */
+    if( win_type < 2 ) {
+        /* Start from 0 */
+        S0 = 0.0f;
+        /* Approximation of sin(f) */
+        S1 = freq;
+    } else {
+        /* Start from 1 */
+        S0 = 1.0f;
+        /* Approximation of cos(f) */
+        S1 = 0.5f * c;
+    }
+
+    /* Uses the recursive equation:   sin(n*f) = 2 * cos(f) * sin((n-1)*f) - sin((n-2)*f)   */
+    /* 4 samples at a time */
+    for( k = 0; k < length; k += 4 ) {
+        px_win[ k + 0 ] = px[ k + 0 ] * 0.5f * ( S0 + S1 );
+        px_win[ k + 1 ] = px[ k + 1 ] * S1;
+        S0 = c * S1 - S0;
+        px_win[ k + 2 ] = px[ k + 2 ] * 0.5f * ( S1 + S0 );
+        px_win[ k + 3 ] = px[ k + 3 ] * S0;
+        S1 = c * S0 - S1;
+    }
+}
diff --git a/drivers/opus/silk/float/autocorrelation_FLP.c b/drivers/opus/silk/float/autocorrelation_FLP.c
new file mode 100644
index 0000000000..192a001b16
--- /dev/null
+++ b/drivers/opus/silk/float/autocorrelation_FLP.c
@@ -0,0 +1,52 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "typedef.h"
+#include "SigProc_FLP.h"
+
+/* compute autocorrelation */
+void silk_autocorrelation_FLP(
+    silk_float          *results,           /* O    result (length correlationCount)                            */
+    const silk_float    *inputData,         /* I    input data to correlate                                     */
+    opus_int            inputDataSize,      /* I    length of input                                             */
+    opus_int            correlationCount    /* I    number of correlation taps to compute                       */
+)
+{
+    opus_int i;
+
+    if( correlationCount > inputDataSize ) {
+        correlationCount = inputDataSize;
+    }
+
+    for( i = 0; i < correlationCount; i++ ) {
+        results[ i ] =  (silk_float)silk_inner_product_FLP( inputData, inputData + i, inputDataSize - i );
+    }
+}
diff --git a/drivers/opus/silk/float/burg_modified_FLP.c b/drivers/opus/silk/float/burg_modified_FLP.c
new file mode 100644
index 0000000000..0f30ca2280
--- /dev/null
+++ b/drivers/opus/silk/float/burg_modified_FLP.c
@@ -0,0 +1,186 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+#include "tuning_parameters.h"
+#include "define.h"
+
+#define MAX_FRAME_SIZE              384 /* subfr_length * nb_subfr = ( 0.005 * 16000 + 16 ) * 4 = 384*/
+
+/* Compute reflection coefficients from input signal */
+silk_float silk_burg_modified_FLP(          /* O    returns residual energy                                     */
+    silk_float          A[],                /* O    prediction coefficients (length order)                      */
+    const silk_float    x[],                /* I    input signal, length: nb_subfr*(D+L_sub)                    */
+    const silk_float    minInvGain,         /* I    minimum inverse prediction gain                             */
+    const opus_int      subfr_length,       /* I    input signal subframe length (incl. D preceding samples)    */
+    const opus_int      nb_subfr,           /* I    number of subframes stacked in x                            */
+    const opus_int      D                   /* I    order                                                       */
+)
+{
+    opus_int         k, n, s, reached_max_gain;
+    double           C0, invGain, num, nrg_f, nrg_b, rc, Atmp, tmp1, tmp2;
+    const silk_float *x_ptr;
+    double           C_first_row[ SILK_MAX_ORDER_LPC ], C_last_row[ SILK_MAX_ORDER_LPC ];
+    double           CAf[ SILK_MAX_ORDER_LPC + 1 ], CAb[ SILK_MAX_ORDER_LPC + 1 ];
+    double           Af[ SILK_MAX_ORDER_LPC ];
+
+    silk_assert( subfr_length * nb_subfr <= MAX_FRAME_SIZE );
+
+    /* Compute autocorrelations, added over subframes */
+    C0 = silk_energy_FLP( x, nb_subfr * subfr_length );
+    silk_memset( C_first_row, 0, SILK_MAX_ORDER_LPC * sizeof( double ) );
+    for( s = 0; s < nb_subfr; s++ ) {
+        x_ptr = x + s * subfr_length;
+        for( n = 1; n < D + 1; n++ ) {
+            C_first_row[ n - 1 ] += silk_inner_product_FLP( x_ptr, x_ptr + n, subfr_length - n );
+        }
+    }
+    silk_memcpy( C_last_row, C_first_row, SILK_MAX_ORDER_LPC * sizeof( double ) );
+
+    /* Initialize */
+    CAb[ 0 ] = CAf[ 0 ] = C0 + FIND_LPC_COND_FAC * C0 + 1e-9f;
+    invGain = 1.0f;
+    reached_max_gain = 0;
+    for( n = 0; n < D; n++ ) {
+        /* Update first row of correlation matrix (without first element) */
+        /* Update last row of correlation matrix (without last element, stored in reversed order) */
+        /* Update C * Af */
+        /* Update C * flipud(Af) (stored in reversed order) */
+        for( s = 0; s < nb_subfr; s++ ) {
+            x_ptr = x + s * subfr_length;
+            tmp1 = x_ptr[ n ];
+            tmp2 = x_ptr[ subfr_length - n - 1 ];
+            for( k = 0; k < n; k++ ) {
+                C_first_row[ k ] -= x_ptr[ n ] * x_ptr[ n - k - 1 ];
+                C_last_row[ k ]  -= x_ptr[ subfr_length - n - 1 ] * x_ptr[ subfr_length - n + k ];
+                Atmp = Af[ k ];
+                tmp1 += x_ptr[ n - k - 1 ] * Atmp;
+                tmp2 += x_ptr[ subfr_length - n + k ] * Atmp;
+            }
+            for( k = 0; k <= n; k++ ) {
+                CAf[ k ] -= tmp1 * x_ptr[ n - k ];
+                CAb[ k ] -= tmp2 * x_ptr[ subfr_length - n + k - 1 ];
+            }
+        }
+        tmp1 = C_first_row[ n ];
+        tmp2 = C_last_row[ n ];
+        for( k = 0; k < n; k++ ) {
+            Atmp = Af[ k ];
+            tmp1 += C_last_row[  n - k - 1 ] * Atmp;
+            tmp2 += C_first_row[ n - k - 1 ] * Atmp;
+        }
+        CAf[ n + 1 ] = tmp1;
+        CAb[ n + 1 ] = tmp2;
+
+        /* Calculate nominator and denominator for the next order reflection (parcor) coefficient */
+        num = CAb[ n + 1 ];
+        nrg_b = CAb[ 0 ];
+        nrg_f = CAf[ 0 ];
+        for( k = 0; k < n; k++ ) {
+            Atmp = Af[ k ];
+            num   += CAb[ n - k ] * Atmp;
+            nrg_b += CAb[ k + 1 ] * Atmp;
+            nrg_f += CAf[ k + 1 ] * Atmp;
+        }
+        silk_assert( nrg_f > 0.0 );
+        silk_assert( nrg_b > 0.0 );
+
+        /* Calculate the next order reflection (parcor) coefficient */
+        rc = -2.0 * num / ( nrg_f + nrg_b );
+        silk_assert( rc > -1.0 && rc < 1.0 );
+
+        /* Update inverse prediction gain */
+        tmp1 = invGain * ( 1.0 - rc * rc );
+        if( tmp1 <= minInvGain ) {
+            /* Max prediction gain exceeded; set reflection coefficient such that max prediction gain is exactly hit */
+            rc = sqrt( 1.0 - minInvGain / invGain );
+            if( num > 0 ) {
+                /* Ensure adjusted reflection coefficients has the original sign */
+                rc = -rc;
+            }
+            invGain = minInvGain;
+            reached_max_gain = 1;
+        } else {
+            invGain = tmp1;
+        }
+
+        /* Update the AR coefficients */
+        for( k = 0; k < (n + 1) >> 1; k++ ) {
+            tmp1 = Af[ k ];
+            tmp2 = Af[ n - k - 1 ];
+            Af[ k ]         = tmp1 + rc * tmp2;
+            Af[ n - k - 1 ] = tmp2 + rc * tmp1;
+        }
+        Af[ n ] = rc;
+
+        if( reached_max_gain ) {
+            /* Reached max prediction gain; set remaining coefficients to zero and exit loop */
+            for( k = n + 1; k < D; k++ ) {
+                Af[ k ] = 0.0;
+            }
+            break;
+        }
+
+        /* Update C * Af and C * Ab */
+        for( k = 0; k <= n + 1; k++ ) {
+            tmp1 = CAf[ k ];
+            CAf[ k ]          += rc * CAb[ n - k + 1 ];
+            CAb[ n - k + 1  ] += rc * tmp1;
+        }
+    }
+
+    if( reached_max_gain ) {
+        /* Convert to silk_float */
+        for( k = 0; k < D; k++ ) {
+            A[ k ] = (silk_float)( -Af[ k ] );
+        }
+        /* Subtract energy of preceding samples from C0 */
+        for( s = 0; s < nb_subfr; s++ ) {
+            C0 -= silk_energy_FLP( x + s * subfr_length, D );
+        }
+        /* Approximate residual energy */
+        nrg_f = C0 * invGain;
+    } else {
+        /* Compute residual energy and store coefficients as silk_float */
+        nrg_f = CAf[ 0 ];
+        tmp1 = 1.0;
+        for( k = 0; k < D; k++ ) {
+            Atmp = Af[ k ];
+            nrg_f += CAf[ k + 1 ] * Atmp;
+            tmp1  += Atmp * Atmp;
+            A[ k ] = (silk_float)(-Atmp);
+        }
+        nrg_f -= FIND_LPC_COND_FAC * C0 * tmp1;
+    }
+
+    /* Return residual energy */
+    return (silk_float)nrg_f;
+}
diff --git a/drivers/opus/silk/float/bwexpander_FLP.c b/drivers/opus/silk/float/bwexpander_FLP.c
new file mode 100644
index 0000000000..86154dc3f1
--- /dev/null
+++ b/drivers/opus/silk/float/bwexpander_FLP.c
@@ -0,0 +1,49 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+/* Chirp (bw expand) LP AR filter */
+void silk_bwexpander_FLP(
+    silk_float          *ar,                /* I/O  AR filter to be expanded (without leading 1)                */
+    const opus_int      d,                  /* I    length of ar                                                */
+    const silk_float    chirp               /* I    chirp factor (typically in range (0..1) )                   */
+)
+{
+    opus_int   i;
+    silk_float cfac = chirp;
+
+    for( i = 0; i < d - 1; i++ ) {
+        ar[ i ] *=  cfac;
+        cfac    *=  chirp;
+    }
+    ar[ d - 1 ] *=  cfac;
+}
diff --git a/drivers/opus/silk/float/corrMatrix_FLP.c b/drivers/opus/silk/float/corrMatrix_FLP.c
new file mode 100644
index 0000000000..e193c98f11
--- /dev/null
+++ b/drivers/opus/silk/float/corrMatrix_FLP.c
@@ -0,0 +1,93 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/**********************************************************************
+ * Correlation matrix computations for LS estimate.
+ **********************************************************************/
+
+#include "main_FLP.h"
+
+/* Calculates correlation vector X'*t */
+void silk_corrVector_FLP(
+    const silk_float                *x,                                 /* I    x vector [L+order-1] used to create X       */
+    const silk_float                *t,                                 /* I    Target vector [L]                           */
+    const opus_int                  L,                                  /* I    Length of vecors                            */
+    const opus_int                  Order,                              /* I    Max lag for correlation                     */
+    silk_float                      *Xt                                 /* O    X'*t correlation vector [order]             */
+)
+{
+    opus_int lag;
+    const silk_float *ptr1;
+
+    ptr1 = &x[ Order - 1 ];                     /* Points to first sample of column 0 of X: X[:,0] */
+    for( lag = 0; lag < Order; lag++ ) {
+        /* Calculate X[:,lag]'*t */
+        Xt[ lag ] = (silk_float)silk_inner_product_FLP( ptr1, t, L );
+        ptr1--;                                 /* Next column of X */
+    }
+}
+
+/* Calculates correlation matrix X'*X */
+void silk_corrMatrix_FLP(
+    const silk_float                *x,                                 /* I    x vector [ L+order-1 ] used to create X     */
+    const opus_int                  L,                                  /* I    Length of vectors                           */
+    const opus_int                  Order,                              /* I    Max lag for correlation                     */
+    silk_float                      *XX                                 /* O    X'*X correlation matrix [order x order]     */
+)
+{
+    opus_int j, lag;
+    double  energy;
+    const silk_float *ptr1, *ptr2;
+
+    ptr1 = &x[ Order - 1 ];                     /* First sample of column 0 of X */
+    energy = silk_energy_FLP( ptr1, L );  /* X[:,0]'*X[:,0] */
+    matrix_ptr( XX, 0, 0, Order ) = ( silk_float )energy;
+    for( j = 1; j < Order; j++ ) {
+        /* Calculate X[:,j]'*X[:,j] */
+        energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ];
+        matrix_ptr( XX, j, j, Order ) = ( silk_float )energy;
+    }
+
+    ptr2 = &x[ Order - 2 ];                     /* First sample of column 1 of X */
+    for( lag = 1; lag < Order; lag++ ) {
+        /* Calculate X[:,0]'*X[:,lag] */
+        energy = silk_inner_product_FLP( ptr1, ptr2, L );
+        matrix_ptr( XX, lag, 0, Order ) = ( silk_float )energy;
+        matrix_ptr( XX, 0, lag, Order ) = ( silk_float )energy;
+        /* Calculate X[:,j]'*X[:,j + lag] */
+        for( j = 1; j < ( Order - lag ); j++ ) {
+            energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ];
+            matrix_ptr( XX, lag + j, j, Order ) = ( silk_float )energy;
+            matrix_ptr( XX, j, lag + j, Order ) = ( silk_float )energy;
+        }
+        ptr2--;                                 /* Next column of X */
+    }
+}
diff --git a/drivers/opus/silk/float/encode_frame_FLP.c b/drivers/opus/silk/float/encode_frame_FLP.c
new file mode 100644
index 0000000000..90e5357ced
--- /dev/null
+++ b/drivers/opus/silk/float/encode_frame_FLP.c
@@ -0,0 +1,372 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */
+static OPUS_INLINE void silk_LBRR_encode_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    const silk_float                xfw[],                              /* I    Input signal                                */
+    opus_int                        condCoding                          /* I    The type of conditional coding used so far for this frame */
+);
+
+void silk_encode_do_VAD_FLP(
+    silk_encoder_state_FLP          *psEnc                              /* I/O  Encoder state FLP                           */
+)
+{
+    /****************************/
+    /* Voice Activity Detection */
+    /****************************/
+    silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1 );
+
+    /**************************************************/
+    /* Convert speech activity into VAD and DTX flags */
+    /**************************************************/
+    if( psEnc->sCmn.speech_activity_Q8 < SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) {
+        psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
+        psEnc->sCmn.noSpeechCounter++;
+        if( psEnc->sCmn.noSpeechCounter < NB_SPEECH_FRAMES_BEFORE_DTX ) {
+            psEnc->sCmn.inDTX = 0;
+        } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
+            psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
+            psEnc->sCmn.inDTX           = 0;
+        }
+        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0;
+    } else {
+        psEnc->sCmn.noSpeechCounter    = 0;
+        psEnc->sCmn.inDTX              = 0;
+        psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
+        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
+    }
+}
+
+/****************/
+/* Encode frame */
+/****************/
+opus_int silk_encode_frame_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    opus_int32                      *pnBytesOut,                        /* O    Number of payload bytes;                    */
+    ec_enc                          *psRangeEnc,                        /* I/O  compressor data structure                   */
+    opus_int                        condCoding,                         /* I    The type of conditional coding to use       */
+    opus_int                        maxBits,                            /* I    If > 0: maximum number of output bits       */
+    opus_int                        useCBR                              /* I    Flag to force constant-bitrate operation    */
+)
+{
+    silk_encoder_control_FLP sEncCtrl;
+    opus_int     i, iter, maxIter, found_upper, found_lower, ret = 0;
+    silk_float   *x_frame, *res_pitch_frame;
+    silk_float   xfw[ MAX_FRAME_LENGTH ];
+    silk_float   res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];
+    ec_enc       sRangeEnc_copy, sRangeEnc_copy2;
+    silk_nsq_state sNSQ_copy, sNSQ_copy2;
+    opus_int32   seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper;
+    opus_int32   gainsID, gainsID_lower, gainsID_upper;
+    opus_int16   gainMult_Q8;
+    opus_int16   ec_prevLagIndex_copy;
+    opus_int     ec_prevSignalType_copy;
+    opus_int8    LastGainIndex_copy2;
+    opus_int32   pGains_Q16[ MAX_NB_SUBFR ];
+    opus_uint8   ec_buf_copy[ 1275 ];
+
+    /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */
+    LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0;
+
+    psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;
+
+    /**************************************************************/
+    /* Set up Input Pointers, and insert frame in input buffer    */
+    /**************************************************************/
+    /* pointers aligned with start of frame to encode */
+    x_frame         = psEnc->x_buf + psEnc->sCmn.ltp_mem_length;    /* start of frame to encode */
+    res_pitch_frame = res_pitch    + psEnc->sCmn.ltp_mem_length;    /* start of pitch LPC residual frame */
+
+    /***************************************/
+    /* Ensure smooth bandwidth transitions */
+    /***************************************/
+    silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
+
+    /*******************************************/
+    /* Copy new frame to front of input buffer */
+    /*******************************************/
+    silk_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
+
+    /* Add tiny signal to avoid high CPU load from denormalized floating point numbers */
+    for( i = 0; i < 8; i++ ) {
+        x_frame[ LA_SHAPE_MS * psEnc->sCmn.fs_kHz + i * ( psEnc->sCmn.frame_length >> 3 ) ] += ( 1 - ( i & 2 ) ) * 1e-6f;
+    }
+
+    if( !psEnc->sCmn.prefillFlag ) {
+        /*****************************************/
+        /* Find pitch lags, initial LPC analysis */
+        /*****************************************/
+        silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch );
+
+        /************************/
+        /* Noise shape analysis */
+        /************************/
+        silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
+
+        /***************************************************/
+        /* Find linear prediction coefficients (LPC + LTP) */
+        /***************************************************/
+        silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, condCoding );
+
+        /****************************************/
+        /* Process gains                        */
+        /****************************************/
+        silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding );
+
+        /*****************************************/
+        /* Prefiltering for noise shaper         */
+        /*****************************************/
+        silk_prefilter_FLP( psEnc, &sEncCtrl, xfw, x_frame );
+
+        /****************************************/
+        /* Low Bitrate Redundant Encoding       */
+        /****************************************/
+        silk_LBRR_encode_FLP( psEnc, &sEncCtrl, xfw, condCoding );
+
+        /* Loop over quantizer and entroy coding to control bitrate */
+        maxIter = 6;
+        gainMult_Q8 = SILK_FIX_CONST( 1, 8 );
+        found_lower = 0;
+        found_upper = 0;
+        gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
+        gainsID_lower = -1;
+        gainsID_upper = -1;
+        /* Copy part of the input state */
+        silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) );
+        silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+        seed_copy = psEnc->sCmn.indices.Seed;
+        ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex;
+        ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType;
+        for( iter = 0; ; iter++ ) {
+            if( gainsID == gainsID_lower ) {
+                nBits = nBits_lower;
+            } else if( gainsID == gainsID_upper ) {
+                nBits = nBits_upper;
+            } else {
+                /* Restore part of the input state */
+                if( iter > 0 ) {
+                    silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) );
+                    silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) );
+                    psEnc->sCmn.indices.Seed = seed_copy;
+                    psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
+                    psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
+                }
+
+                /*****************************************/
+                /* Noise shaping quantization            */
+                /*****************************************/
+                silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, xfw );
+
+                /****************************************/
+                /* Encode Parameters                    */
+                /****************************************/
+                silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );
+
+                /****************************************/
+                /* Encode Excitation Signal             */
+                /****************************************/
+                silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
+                      psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
+
+                nBits = ec_tell( psRangeEnc );
+
+                if( useCBR == 0 && iter == 0 && nBits <= maxBits ) {
+                    break;
+                }
+            }
+
+            if( iter == maxIter ) {
+                if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) {
+                    /* Restore output state from earlier iteration that did meet the bitrate budget */
+                    silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
+                    silk_assert( sRangeEnc_copy2.offs <= 1275 );
+                    silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs );
+                    silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) );
+                    psEnc->sShape.LastGainIndex = LastGainIndex_copy2;
+                }
+                break;
+            }
+
+            if( nBits > maxBits ) {
+                if( found_lower == 0 && iter >= 2 ) {
+                    /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */
+                    sEncCtrl.Lambda *= 1.5f;
+                    found_upper = 0;
+                    gainsID_upper = -1;
+                } else {
+                    found_upper = 1;
+                    nBits_upper = nBits;
+                    gainMult_upper = gainMult_Q8;
+                    gainsID_upper = gainsID;
+                }
+            } else if( nBits < maxBits - 5 ) {
+                found_lower = 1;
+                nBits_lower = nBits;
+                gainMult_lower = gainMult_Q8;
+                if( gainsID != gainsID_lower ) {
+                    gainsID_lower = gainsID;
+                    /* Copy part of the output state */
+                    silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
+                    silk_assert( psRangeEnc->offs <= 1275 );
+                    silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs );
+                    silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+                    LastGainIndex_copy2 = psEnc->sShape.LastGainIndex;
+                }
+            } else {
+                /* Within 5 bits of budget: close enough */
+                break;
+            }
+
+            if( ( found_lower & found_upper ) == 0 ) {
+                /* Adjust gain according to high-rate rate/distortion curve */
+                opus_int32 gain_factor_Q16;
+                gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) );
+                gain_factor_Q16 = silk_min_32( gain_factor_Q16, SILK_FIX_CONST( 2, 16 ) );
+                if( nBits > maxBits ) {
+                    gain_factor_Q16 = silk_max_32( gain_factor_Q16, SILK_FIX_CONST( 1.3, 16 ) );
+                }
+                gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 );
+            } else {
+                /* Adjust gain by interpolating */
+                gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower );
+                /* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */
+                if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) {
+                    gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 );
+                } else
+                if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) {
+                    gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 );
+                }
+            }
+
+            for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+                pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], gainMult_Q8 ), 8 );
+            }
+
+            /* Quantize gains */
+            psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
+            silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
+                  &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+            /* Unique identifier of gains vector */
+            gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
+
+            /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
+            for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+                sEncCtrl.Gains[ i ] = pGains_Q16[ i ] / 65536.0f;
+            }
+        }
+    }
+
+    /* Update input buffer */
+    silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
+        ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( silk_float ) );
+
+    /* Exit without entropy coding */
+    if( psEnc->sCmn.prefillFlag ) {
+        /* No payload */
+        *pnBytesOut = 0;
+        return ret;
+    }
+
+    /* Parameters needed for next frame */
+    psEnc->sCmn.prevLag        = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
+    psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;
+
+    /****************************************/
+    /* Finalize payload                     */
+    /****************************************/
+    psEnc->sCmn.first_frame_after_reset = 0;
+    /* Payload size */
+    *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
+
+    return ret;
+}
+
+/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate  */
+static OPUS_INLINE void silk_LBRR_encode_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    const silk_float                xfw[],                              /* I    Input signal                                */
+    opus_int                        condCoding                          /* I    The type of conditional coding used so far for this frame */
+)
+{
+    opus_int     k;
+    opus_int32   Gains_Q16[ MAX_NB_SUBFR ];
+    silk_float   TempGains[ MAX_NB_SUBFR ];
+    SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ];
+    silk_nsq_state sNSQ_LBRR;
+
+    /*******************************************/
+    /* Control use of inband LBRR              */
+    /*******************************************/
+    if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
+        psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
+
+        /* Copy noise shaping quantizer state and quantization indices from regular encoding */
+        silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+        silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
+
+        /* Save original gains */
+        silk_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
+
+        if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) {
+            /* First frame in packet or previous frame not LBRR coded */
+            psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;
+
+            /* Increase Gains to get target LBRR rate */
+            psIndices_LBRR->GainsIndices[ 0 ] += psEnc->sCmn.LBRR_GainIncreases;
+            psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
+        }
+
+        /* Decode to get gains in sync with decoder */
+        silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices,
+            &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+        /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
+        for( k = 0; k <  psEnc->sCmn.nb_subfr; k++ ) {
+            psEncCtrl->Gains[ k ] = Gains_Q16[ k ] * ( 1.0f / 65536.0f );
+        }
+
+        /*****************************************/
+        /* Noise shaping quantization            */
+        /*****************************************/
+        silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR,
+            psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw );
+
+        /* Restore original gains */
+        silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
+    }
+}
diff --git a/drivers/opus/silk/float/energy_FLP.c b/drivers/opus/silk/float/energy_FLP.c
new file mode 100644
index 0000000000..d441526df3
--- /dev/null
+++ b/drivers/opus/silk/float/energy_FLP.c
@@ -0,0 +1,60 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+/* sum of squares of a silk_float array, with result as double */
+double silk_energy_FLP(
+    const silk_float    *data,
+    opus_int            dataSize
+)
+{
+    opus_int  i, dataSize4;
+    double   result;
+
+    /* 4x unrolled loop */
+    result = 0.0;
+    dataSize4 = dataSize & 0xFFFC;
+    for( i = 0; i < dataSize4; i += 4 ) {
+        result += data[ i + 0 ] * (double)data[ i + 0 ] +
+                  data[ i + 1 ] * (double)data[ i + 1 ] +
+                  data[ i + 2 ] * (double)data[ i + 2 ] +
+                  data[ i + 3 ] * (double)data[ i + 3 ];
+    }
+
+    /* add any remaining products */
+    for( ; i < dataSize; i++ ) {
+        result += data[ i ] * (double)data[ i ];
+    }
+
+    silk_assert( result >= 0.0 );
+    return result;
+}
diff --git a/drivers/opus/silk/float/find_LPC_FLP.c b/drivers/opus/silk/float/find_LPC_FLP.c
new file mode 100644
index 0000000000..212f2de3cd
--- /dev/null
+++ b/drivers/opus/silk/float/find_LPC_FLP.c
@@ -0,0 +1,104 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "define.h"
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/* LPC analysis */
+void silk_find_LPC_FLP(
+    silk_encoder_state              *psEncC,                            /* I/O  Encoder state                               */
+    opus_int16                      NLSF_Q15[],                         /* O    NLSFs                                       */
+    const silk_float                x[],                                /* I    Input signal                                */
+    const silk_float                minInvGain                          /* I    Inverse of max prediction gain              */
+)
+{
+    opus_int    k, subfr_length;
+    silk_float  a[ MAX_LPC_ORDER ];
+
+    /* Used only for NLSF interpolation */
+    silk_float  res_nrg, res_nrg_2nd, res_nrg_interp;
+    opus_int16  NLSF0_Q15[ MAX_LPC_ORDER ];
+    silk_float  a_tmp[ MAX_LPC_ORDER ];
+    silk_float  LPC_res[ MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ];
+
+    subfr_length = psEncC->subfr_length + psEncC->predictLPCOrder;
+
+    /* Default: No interpolation */
+    psEncC->indices.NLSFInterpCoef_Q2 = 4;
+
+    /* Burg AR analysis for the full frame */
+    res_nrg = silk_burg_modified_FLP( a, x, minInvGain, subfr_length, psEncC->nb_subfr, psEncC->predictLPCOrder );
+
+    if( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) {
+        /* Optimal solution for last 10 ms; subtract residual energy here, as that's easier than        */
+        /* adding it to the residual energy of the first 10 ms in each iteration of the search below    */
+        res_nrg -= silk_burg_modified_FLP( a_tmp, x + ( MAX_NB_SUBFR / 2 ) * subfr_length, minInvGain, subfr_length, MAX_NB_SUBFR / 2, psEncC->predictLPCOrder );
+
+        /* Convert to NLSFs */
+        silk_A2NLSF_FLP( NLSF_Q15, a_tmp, psEncC->predictLPCOrder );
+
+        /* Search over interpolation indices to find the one with lowest residual energy */
+        res_nrg_2nd = silk_float_MAX;
+        for( k = 3; k >= 0; k-- ) {
+            /* Interpolate NLSFs for first half */
+            silk_interpolate( NLSF0_Q15, psEncC->prev_NLSFq_Q15, NLSF_Q15, k, psEncC->predictLPCOrder );
+
+            /* Convert to LPC for residual energy evaluation */
+            silk_NLSF2A_FLP( a_tmp, NLSF0_Q15, psEncC->predictLPCOrder );
+
+            /* Calculate residual energy with LSF interpolation */
+            silk_LPC_analysis_filter_FLP( LPC_res, a_tmp, x, 2 * subfr_length, psEncC->predictLPCOrder );
+            res_nrg_interp = (silk_float)(
+                silk_energy_FLP( LPC_res + psEncC->predictLPCOrder,                subfr_length - psEncC->predictLPCOrder ) +
+                silk_energy_FLP( LPC_res + psEncC->predictLPCOrder + subfr_length, subfr_length - psEncC->predictLPCOrder ) );
+
+            /* Determine whether current interpolated NLSFs are best so far */
+            if( res_nrg_interp < res_nrg ) {
+                /* Interpolation has lower residual energy */
+                res_nrg = res_nrg_interp;
+                psEncC->indices.NLSFInterpCoef_Q2 = (opus_int8)k;
+            } else if( res_nrg_interp > res_nrg_2nd ) {
+                /* No reason to continue iterating - residual energies will continue to climb */
+                break;
+            }
+            res_nrg_2nd = res_nrg_interp;
+        }
+    }
+
+    if( psEncC->indices.NLSFInterpCoef_Q2 == 4 ) {
+        /* NLSF interpolation is currently inactive, calculate NLSFs from full frame AR coefficients */
+        silk_A2NLSF_FLP( NLSF_Q15, a, psEncC->predictLPCOrder );
+    }
+
+    silk_assert( psEncC->indices.NLSFInterpCoef_Q2 == 4 || 
+        ( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) );
+}
diff --git a/drivers/opus/silk/float/find_LTP_FLP.c b/drivers/opus/silk/float/find_LTP_FLP.c
new file mode 100644
index 0000000000..5c62851f20
--- /dev/null
+++ b/drivers/opus/silk/float/find_LTP_FLP.c
@@ -0,0 +1,132 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+void silk_find_LTP_FLP(
+    silk_float                      b[ MAX_NB_SUBFR * LTP_ORDER ],      /* O    LTP coefs                                   */
+    silk_float                      WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization       */
+    silk_float                      *LTPredCodGain,                     /* O    LTP coding gain                             */
+    const silk_float                r_lpc[],                            /* I    LPC residual                                */
+    const opus_int                  lag[  MAX_NB_SUBFR ],               /* I    LTP lags                                    */
+    const silk_float                Wght[ MAX_NB_SUBFR ],               /* I    Weights                                     */
+    const opus_int                  subfr_length,                       /* I    Subframe length                             */
+    const opus_int                  nb_subfr,                           /* I    number of subframes                         */
+    const opus_int                  mem_offset                          /* I    Number of samples in LTP memory             */
+)
+{
+    opus_int   i, k;
+    silk_float *b_ptr, temp, *WLTP_ptr;
+    silk_float LPC_res_nrg, LPC_LTP_res_nrg;
+    silk_float d[ MAX_NB_SUBFR ], m, g, delta_b[ LTP_ORDER ];
+    silk_float w[ MAX_NB_SUBFR ], nrg[ MAX_NB_SUBFR ], regu;
+    silk_float Rr[ LTP_ORDER ], rr[ MAX_NB_SUBFR ];
+    const silk_float *r_ptr, *lag_ptr;
+
+    b_ptr    = b;
+    WLTP_ptr = WLTP;
+    r_ptr    = &r_lpc[ mem_offset ];
+    for( k = 0; k < nb_subfr; k++ ) {
+        lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
+
+        silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, WLTP_ptr );
+        silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, Rr );
+
+        rr[ k ] = ( silk_float )silk_energy_FLP( r_ptr, subfr_length );
+        regu = 1.0f + rr[ k ] +
+            matrix_ptr( WLTP_ptr, 0, 0, LTP_ORDER ) +
+            matrix_ptr( WLTP_ptr, LTP_ORDER-1, LTP_ORDER-1, LTP_ORDER );
+        regu *= LTP_DAMPING / 3;
+        silk_regularize_correlations_FLP( WLTP_ptr, &rr[ k ], regu, LTP_ORDER );
+        silk_solve_LDL_FLP( WLTP_ptr, LTP_ORDER, Rr, b_ptr );
+
+        /* Calculate residual energy */
+        nrg[ k ] = silk_residual_energy_covar_FLP( b_ptr, WLTP_ptr, Rr, rr[ k ], LTP_ORDER );
+
+        temp = Wght[ k ] / ( nrg[ k ] * Wght[ k ] + 0.01f * subfr_length );
+        silk_scale_vector_FLP( WLTP_ptr, temp, LTP_ORDER * LTP_ORDER );
+        w[ k ] = matrix_ptr( WLTP_ptr, LTP_ORDER / 2, LTP_ORDER / 2, LTP_ORDER );
+
+        r_ptr    += subfr_length;
+        b_ptr    += LTP_ORDER;
+        WLTP_ptr += LTP_ORDER * LTP_ORDER;
+    }
+
+    /* Compute LTP coding gain */
+    if( LTPredCodGain != NULL ) {
+        LPC_LTP_res_nrg = 1e-6f;
+        LPC_res_nrg     = 0.0f;
+        for( k = 0; k < nb_subfr; k++ ) {
+            LPC_res_nrg     += rr[  k ] * Wght[ k ];
+            LPC_LTP_res_nrg += nrg[ k ] * Wght[ k ];
+        }
+
+        silk_assert( LPC_LTP_res_nrg > 0 );
+        *LTPredCodGain = 3.0f * silk_log2( LPC_res_nrg / LPC_LTP_res_nrg );
+    }
+
+    /* Smoothing */
+    /* d = sum( B, 1 ); */
+    b_ptr = b;
+    for( k = 0; k < nb_subfr; k++ ) {
+        d[ k ] = 0;
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            d[ k ] += b_ptr[ i ];
+        }
+        b_ptr += LTP_ORDER;
+    }
+    /* m = ( w * d' ) / ( sum( w ) + 1e-3 ); */
+    temp = 1e-3f;
+    for( k = 0; k < nb_subfr; k++ ) {
+        temp += w[ k ];
+    }
+    m = 0;
+    for( k = 0; k < nb_subfr; k++ ) {
+        m += d[ k ] * w[ k ];
+    }
+    m = m / temp;
+
+    b_ptr = b;
+    for( k = 0; k < nb_subfr; k++ ) {
+        g = LTP_SMOOTHING / ( LTP_SMOOTHING + w[ k ] ) * ( m - d[ k ] );
+        temp = 0;
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            delta_b[ i ] = silk_max_float( b_ptr[ i ], 0.1f );
+            temp += delta_b[ i ];
+        }
+        temp = g / temp;
+        for( i = 0; i < LTP_ORDER; i++ ) {
+            b_ptr[ i ] = b_ptr[ i ] + delta_b[ i ] * temp;
+        }
+        b_ptr += LTP_ORDER;
+    }
+}
diff --git a/drivers/opus/silk/float/find_pitch_lags_FLP.c b/drivers/opus/silk/float/find_pitch_lags_FLP.c
new file mode 100644
index 0000000000..d74d5941b5
--- /dev/null
+++ b/drivers/opus/silk/float/find_pitch_lags_FLP.c
@@ -0,0 +1,132 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include <stdlib.h>
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+void silk_find_pitch_lags_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    silk_float                      res[],                              /* O    Residual                                    */
+    const silk_float                x[],                                /* I    Speech signal                               */
+    int                             arch                                /* I    Run-time architecture                       */
+)
+{
+    opus_int   buf_len;
+    silk_float thrhld, res_nrg;
+    const silk_float *x_buf_ptr, *x_buf;
+    silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
+    silk_float A[         MAX_FIND_PITCH_LPC_ORDER ];
+    silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ];
+    silk_float Wsig[      FIND_PITCH_LPC_WIN_MAX ];
+    silk_float *Wsig_ptr;
+
+    /******************************************/
+    /* Set up buffer lengths etc based on Fs  */
+    /******************************************/
+    buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
+
+    /* Safety check */
+    silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
+
+    x_buf = x - psEnc->sCmn.ltp_mem_length;
+
+    /******************************************/
+    /* Estimate LPC AR coeficients            */
+    /******************************************/
+
+    /* Calculate windowed signal */
+
+    /* First LA_LTP samples */
+    x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
+    Wsig_ptr  = Wsig;
+    silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
+
+    /* Middle non-windowed samples */
+    Wsig_ptr  += psEnc->sCmn.la_pitch;
+    x_buf_ptr += psEnc->sCmn.la_pitch;
+    silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) );
+
+    /* Last LA_LTP samples */
+    Wsig_ptr  += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
+    x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 );
+    silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
+
+    /* Calculate autocorrelation sequence */
+    silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
+
+    /* Add white noise, as a fraction of the energy */
+    auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1;
+
+    /* Calculate the reflection coefficients using Schur */
+    res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
+
+    /* Prediction gain */
+    psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f );
+
+    /* Convert reflection coefficients to prediction coefficients */
+    silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder );
+
+    /* Bandwidth expansion */
+    silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION );
+
+    /*****************************************/
+    /* LPC analysis filtering                */
+    /*****************************************/
+    silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
+
+    if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
+        /* Threshold for pitch estimator */
+        thrhld  = 0.6f;
+        thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder;
+        thrhld -= 0.1f   * psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f );
+        thrhld -= 0.15f  * (psEnc->sCmn.prevSignalType >> 1);
+        thrhld -= 0.1f   * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f );
+
+        /*****************************************/
+        /* Call Pitch estimator                  */
+        /*****************************************/
+        if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex,
+            &psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f,
+            thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 )
+        {
+            psEnc->sCmn.indices.signalType = TYPE_VOICED;
+        } else {
+            psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
+        }
+    } else {
+        silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
+        psEnc->sCmn.indices.lagIndex = 0;
+        psEnc->sCmn.indices.contourIndex = 0;
+        psEnc->LTPCorr = 0;
+    }
+}
diff --git a/drivers/opus/silk/float/find_pred_coefs_FLP.c b/drivers/opus/silk/float/find_pred_coefs_FLP.c
new file mode 100644
index 0000000000..e0d8804cc9
--- /dev/null
+++ b/drivers/opus/silk/float/find_pred_coefs_FLP.c
@@ -0,0 +1,117 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+/* Find LPC and LTP coefficients */
+void silk_find_pred_coefs_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    const silk_float                res_pitch[],                        /* I    Residual from pitch analysis                */
+    const silk_float                x[],                                /* I    Speech signal                               */
+    opus_int                        condCoding                          /* I    The type of conditional coding to use       */
+)
+{
+    opus_int         i;
+    silk_float       WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
+    silk_float       invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ];
+    opus_int16       NLSF_Q15[ MAX_LPC_ORDER ];
+    const silk_float *x_ptr;
+    silk_float       *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
+    silk_float       minInvGain;
+
+    /* Weighting for weighted least squares */
+    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+        silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
+        invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
+        Wght[ i ]     = invGains[ i ] * invGains[ i ];
+    }
+
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /**********/
+        /* VOICED */
+        /**********/
+        silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
+
+        /* LTP analysis */
+        silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch,
+            psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length );
+
+        /* Quantize LTP gain parameters */
+        silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
+            &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr );
+
+        /* Control LTP scaling */
+        silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
+
+        /* Create LTP residual */
+        silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
+            psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
+    } else {
+        /************/
+        /* UNVOICED */
+        /************/
+        /* Create signal with prepended subframes, scaled by inverse gains */
+        x_ptr     = x - psEnc->sCmn.predictLPCOrder;
+        x_pre_ptr = LPC_in_pre;
+        for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+            silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
+                psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
+            x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
+            x_ptr     += psEnc->sCmn.subfr_length;
+        }
+        silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
+        psEncCtrl->LTPredCodGain = 0.0f;
+		psEnc->sCmn.sum_log_gain_Q7 = 0;
+    }
+
+    /* Limit on total predictive coding gain */
+    if( psEnc->sCmn.first_frame_after_reset ) {
+        minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
+    } else {        
+        minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) /  MAX_PREDICTION_POWER_GAIN;
+        minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality;
+    }
+
+    /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
+    silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
+
+    /* Quantize LSFs */
+    silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
+
+    /* Calculate residual energy using quantized LPC coefficients */
+    silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains,
+        psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
+
+    /* Copy to prediction struct for use in next frame for interpolation */
+    silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
+}
+
diff --git a/drivers/opus/silk/float/inner_product_FLP.c b/drivers/opus/silk/float/inner_product_FLP.c
new file mode 100644
index 0000000000..57acf5ffba
--- /dev/null
+++ b/drivers/opus/silk/float/inner_product_FLP.c
@@ -0,0 +1,60 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+/* inner product of two silk_float arrays, with result as double */
+double silk_inner_product_FLP(
+    const silk_float    *data1,
+    const silk_float    *data2,
+    opus_int            dataSize
+)
+{
+    opus_int  i, dataSize4;
+    double   result;
+
+    /* 4x unrolled loop */
+    result = 0.0;
+    dataSize4 = dataSize & 0xFFFC;
+    for( i = 0; i < dataSize4; i += 4 ) {
+        result += data1[ i + 0 ] * (double)data2[ i + 0 ] +
+                  data1[ i + 1 ] * (double)data2[ i + 1 ] +
+                  data1[ i + 2 ] * (double)data2[ i + 2 ] +
+                  data1[ i + 3 ] * (double)data2[ i + 3 ];
+    }
+
+    /* add any remaining products */
+    for( ; i < dataSize; i++ ) {
+        result += data1[ i ] * (double)data2[ i ];
+    }
+
+    return result;
+}
diff --git a/drivers/opus/silk/float/k2a_FLP.c b/drivers/opus/silk/float/k2a_FLP.c
new file mode 100644
index 0000000000..a668a32127
--- /dev/null
+++ b/drivers/opus/silk/float/k2a_FLP.c
@@ -0,0 +1,53 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+/* step up function, converts reflection coefficients to prediction coefficients */
+void silk_k2a_FLP(
+    silk_float          *A,                 /* O     prediction coefficients [order]                            */
+    const silk_float    *rc,                /* I     reflection coefficients [order]                            */
+    opus_int32          order               /* I     prediction order                                           */
+)
+{
+    opus_int   k, n;
+    silk_float Atmp[ SILK_MAX_ORDER_LPC ];
+
+    for( k = 0; k < order; k++ ) {
+        for( n = 0; n < k; n++ ) {
+            Atmp[ n ] = A[ n ];
+        }
+        for( n = 0; n < k; n++ ) {
+            A[ n ] += Atmp[ k - n - 1 ] * rc[ k ];
+        }
+        A[ k ] = -rc[ k ];
+    }
+}
diff --git a/drivers/opus/silk/float/levinsondurbin_FLP.c b/drivers/opus/silk/float/levinsondurbin_FLP.c
new file mode 100644
index 0000000000..64aaf0fb29
--- /dev/null
+++ b/drivers/opus/silk/float/levinsondurbin_FLP.c
@@ -0,0 +1,81 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+/* Solve the normal equations using the Levinson-Durbin recursion */
+silk_float silk_levinsondurbin_FLP(         /* O    prediction error energy                                     */
+    silk_float          A[],                /* O    prediction coefficients    [order]                          */
+    const silk_float    corr[],             /* I    input auto-correlations [order + 1]                         */
+    const opus_int      order               /* I    prediction order                                            */
+)
+{
+    opus_int   i, mHalf, m;
+    silk_float min_nrg, nrg, t, km, Atmp1, Atmp2;
+
+    min_nrg = 1e-12f * corr[ 0 ] + 1e-9f;
+    nrg = corr[ 0 ];
+    nrg = silk_max_float(min_nrg, nrg);
+    A[ 0 ] = corr[ 1 ] / nrg;
+    nrg -= A[ 0 ] * corr[ 1 ];
+    nrg = silk_max_float(min_nrg, nrg);
+
+    for( m = 1; m < order; m++ )
+    {
+        t = corr[ m + 1 ];
+        for( i = 0; i < m; i++ ) {
+            t -= A[ i ] * corr[ m - i ];
+        }
+
+        /* reflection coefficient */
+        km = t / nrg;
+
+        /* residual energy */
+        nrg -= km * t;
+        nrg = silk_max_float(min_nrg, nrg);
+
+        mHalf = m >> 1;
+        for( i = 0; i < mHalf; i++ ) {
+            Atmp1 = A[ i ];
+            Atmp2 = A[ m - i - 1 ];
+            A[ m - i - 1 ] -= km * Atmp1;
+            A[ i ]         -= km * Atmp2;
+        }
+        if( m & 1 ) {
+            A[ mHalf ]     -= km * A[ mHalf ];
+        }
+        A[ m ] = km;
+    }
+
+    /* return the residual energy */
+    return nrg;
+}
+
diff --git a/drivers/opus/silk/float/main_FLP.h b/drivers/opus/silk/float/main_FLP.h
new file mode 100644
index 0000000000..92d6ec3df1
--- /dev/null
+++ b/drivers/opus/silk/float/main_FLP.h
@@ -0,0 +1,312 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MAIN_FLP_H
+#define SILK_MAIN_FLP_H
+
+#include "SigProc_FLP.h"
+#include "SigProc_FIX.h"
+#include "structs_FLP.h"
+#include "silk_main.h"
+#include "define.h"
+#include "debug.h"
+#include "entenc.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#define silk_encoder_state_Fxx      silk_encoder_state_FLP
+#define silk_encode_do_VAD_Fxx      silk_encode_do_VAD_FLP
+#define silk_encode_frame_Fxx       silk_encode_frame_FLP
+
+/*********************/
+/* Encoder Functions */
+/*********************/
+
+/* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */
+void silk_HP_variable_cutoff(
+    silk_encoder_state_Fxx          state_Fxx[]                         /* I/O  Encoder states                              */
+);
+
+/* Encoder main function */
+void silk_encode_do_VAD_FLP(
+    silk_encoder_state_FLP          *psEnc                              /* I/O  Encoder state FLP                           */
+);
+
+/* Encoder main function */
+opus_int silk_encode_frame_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    opus_int32                      *pnBytesOut,                        /* O    Number of payload bytes;                    */
+    ec_enc                          *psRangeEnc,                        /* I/O  compressor data structure                   */
+    opus_int                        condCoding,                         /* I    The type of conditional coding to use       */
+    opus_int                        maxBits,                            /* I    If > 0: maximum number of output bits       */
+    opus_int                        useCBR                              /* I    Flag to force constant-bitrate operation    */
+);
+
+/* Initializes the Silk encoder state */
+opus_int silk_init_encoder(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    int                              arch                               /* I    Run-tim architecture                        */
+);
+
+/* Control the Silk encoder */
+opus_int silk_control_encoder(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Pointer to Silk encoder state FLP           */
+    silk_EncControlStruct           *encControl,                        /* I    Control structure                           */
+    const opus_int32                TargetRate_bps,                     /* I    Target max bitrate (bps)                    */
+    const opus_int                  allow_bw_switch,                    /* I    Flag to allow switching audio bandwidth     */
+    const opus_int                  channelNb,                          /* I    Channel number                              */
+    const opus_int                  force_fs_kHz
+);
+
+/****************/
+/* Prefiltering */
+/****************/
+void silk_prefilter_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    const silk_encoder_control_FLP  *psEncCtrl,                         /* I    Encoder control FLP                         */
+    silk_float                      xw[],                               /* O    Weighted signal                             */
+    const silk_float                x[]                                 /* I    Speech signal                               */
+);
+
+/**************************/
+/* Noise shaping analysis */
+/**************************/
+/* Compute noise shaping coefficients and initial gain values */
+void silk_noise_shape_analysis_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    const silk_float                *pitch_res,                         /* I    LPC residual from pitch analysis            */
+    const silk_float                *x                                  /* I    Input signal [frame_length + la_shape]      */
+);
+
+/* Autocorrelations for a warped frequency axis */
+void silk_warped_autocorrelation_FLP(
+    silk_float                      *corr,                              /* O    Result [order + 1]                          */
+    const silk_float                *input,                             /* I    Input data to correlate                     */
+    const silk_float                warping,                            /* I    Warping coefficient                         */
+    const opus_int                  length,                             /* I    Length of input                             */
+    const opus_int                  order                               /* I    Correlation order (even)                    */
+);
+
+/* Calculation of LTP state scaling */
+void silk_LTP_scale_ctrl_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    opus_int                        condCoding                          /* I    The type of conditional coding to use       */
+);
+
+/**********************************************/
+/* Prediction Analysis                        */
+/**********************************************/
+/* Find pitch lags */
+void silk_find_pitch_lags_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    silk_float                      res[],                              /* O    Residual                                    */
+    const silk_float                x[],                                /* I    Speech signal                               */
+    int                             arch                                /* I    Run-time architecture                       */
+);
+
+/* Find LPC and LTP coefficients */
+void silk_find_pred_coefs_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    const silk_float                res_pitch[],                        /* I    Residual from pitch analysis                */
+    const silk_float                x[],                                /* I    Speech signal                               */
+    opus_int                        condCoding                          /* I    The type of conditional coding to use       */
+);
+
+/* LPC analysis */
+void silk_find_LPC_FLP(
+    silk_encoder_state              *psEncC,                            /* I/O  Encoder state                               */
+    opus_int16                      NLSF_Q15[],                         /* O    NLSFs                                       */
+    const silk_float                x[],                                /* I    Input signal                                */
+    const silk_float                minInvGain                          /* I    Prediction gain from LTP (dB)               */
+);
+
+/* LTP analysis */
+void silk_find_LTP_FLP(
+    silk_float                      b[ MAX_NB_SUBFR * LTP_ORDER ],      /* O    LTP coefs                                   */
+    silk_float                      WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization       */
+    silk_float                      *LTPredCodGain,                     /* O    LTP coding gain                             */
+    const silk_float                r_lpc[],                            /* I    LPC residual                                */
+    const opus_int                  lag[  MAX_NB_SUBFR ],               /* I    LTP lags                                    */
+    const silk_float                Wght[ MAX_NB_SUBFR ],               /* I    Weights                                     */
+    const opus_int                  subfr_length,                       /* I    Subframe length                             */
+    const opus_int                  nb_subfr,                           /* I    number of subframes                         */
+    const opus_int                  mem_offset                          /* I    Number of samples in LTP memory             */
+);
+
+void silk_LTP_analysis_filter_FLP(
+    silk_float                      *LTP_res,                           /* O    LTP res MAX_NB_SUBFR*(pre_lgth+subfr_lngth) */
+    const silk_float                *x,                                 /* I    Input signal, with preceding samples        */
+    const silk_float                B[ LTP_ORDER * MAX_NB_SUBFR ],      /* I    LTP coefficients for each subframe          */
+    const opus_int                  pitchL[   MAX_NB_SUBFR ],           /* I    Pitch lags                                  */
+    const silk_float                invGains[ MAX_NB_SUBFR ],           /* I    Inverse quantization gains                  */
+    const opus_int                  subfr_length,                       /* I    Length of each subframe                     */
+    const opus_int                  nb_subfr,                           /* I    number of subframes                         */
+    const opus_int                  pre_length                          /* I    Preceding samples for each subframe         */
+);
+
+/* Calculates residual energies of input subframes where all subframes have LPC_order   */
+/* of preceding samples                                                                 */
+void silk_residual_energy_FLP(
+    silk_float                      nrgs[ MAX_NB_SUBFR ],               /* O    Residual energy per subframe                */
+    const silk_float                x[],                                /* I    Input signal                                */
+    silk_float                      a[ 2 ][ MAX_LPC_ORDER ],            /* I    AR coefs for each frame half                */
+    const silk_float                gains[],                            /* I    Quantization gains                          */
+    const opus_int                  subfr_length,                       /* I    Subframe length                             */
+    const opus_int                  nb_subfr,                           /* I    number of subframes                         */
+    const opus_int                  LPC_order                           /* I    LPC order                                   */
+);
+
+/* 16th order LPC analysis filter */
+void silk_LPC_analysis_filter_FLP(
+    silk_float                      r_LPC[],                            /* O    LPC residual signal                         */
+    const silk_float                PredCoef[],                         /* I    LPC coefficients                            */
+    const silk_float                s[],                                /* I    Input signal                                */
+    const opus_int                  length,                             /* I    Length of input signal                      */
+    const opus_int                  Order                               /* I    LPC order                                   */
+);
+
+/* LTP tap quantizer */
+void silk_quant_LTP_gains_FLP(
+    silk_float                      B[ MAX_NB_SUBFR * LTP_ORDER ],      /* I/O  (Un-)quantized LTP gains                    */
+    opus_int8                       cbk_index[ MAX_NB_SUBFR ],          /* O    Codebook index                              */
+    opus_int8                       *periodicity_index,                 /* O    Periodicity index                           */
+    opus_int32                      *sum_log_gain_Q7,                   /* I/O  Cumulative max prediction gain  */
+    const silk_float                W[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* I    Error weights                        */
+    const opus_int                  mu_Q10,                             /* I    Mu value (R/D tradeoff)                     */
+    const opus_int                  lowComplexity,                      /* I    Flag for low complexity                     */
+    const opus_int                  nb_subfr                            /* I    number of subframes                         */
+);
+
+/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
+silk_float silk_residual_energy_covar_FLP(                              /* O    Weighted residual energy                    */
+    const silk_float                *c,                                 /* I    Filter coefficients                         */
+    silk_float                      *wXX,                               /* I/O  Weighted correlation matrix, reg. out       */
+    const silk_float                *wXx,                               /* I    Weighted correlation vector                 */
+    const silk_float                wxx,                                /* I    Weighted correlation value                  */
+    const opus_int                  D                                   /* I    Dimension                                   */
+);
+
+/* Processing of gains */
+void silk_process_gains_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    opus_int                        condCoding                          /* I    The type of conditional coding to use       */
+);
+
+/******************/
+/* Linear Algebra */
+/******************/
+/* Calculates correlation matrix X'*X */
+void silk_corrMatrix_FLP(
+    const silk_float                *x,                                 /* I    x vector [ L+order-1 ] used to create X     */
+    const opus_int                  L,                                  /* I    Length of vectors                           */
+    const opus_int                  Order,                              /* I    Max lag for correlation                     */
+    silk_float                      *XX                                 /* O    X'*X correlation matrix [order x order]     */
+);
+
+/* Calculates correlation vector X'*t */
+void silk_corrVector_FLP(
+    const silk_float                *x,                                 /* I    x vector [L+order-1] used to create X       */
+    const silk_float                *t,                                 /* I    Target vector [L]                           */
+    const opus_int                  L,                                  /* I    Length of vecors                            */
+    const opus_int                  Order,                              /* I    Max lag for correlation                     */
+    silk_float                      *Xt                                 /* O    X'*t correlation vector [order]             */
+);
+
+/* Add noise to matrix diagonal */
+void silk_regularize_correlations_FLP(
+    silk_float                      *XX,                                /* I/O  Correlation matrices                        */
+    silk_float                      *xx,                                /* I/O  Correlation values                          */
+    const silk_float                noise,                              /* I    Noise energy to add                         */
+    const opus_int                  D                                   /* I    Dimension of XX                             */
+);
+
+/* Function to solve linear equation Ax = b, where A is an MxM symmetric matrix */
+void silk_solve_LDL_FLP(
+    silk_float                      *A,                                 /* I/O  Symmetric square matrix, out: reg.          */
+    const opus_int                  M,                                  /* I    Size of matrix                              */
+    const silk_float                *b,                                 /* I    Pointer to b vector                         */
+    silk_float                      *x                                  /* O    Pointer to x solution vector                */
+);
+
+/* Apply sine window to signal vector.  */
+/* Window types:                        */
+/*  1 -> sine window from 0 to pi/2     */
+/*  2 -> sine window from pi/2 to pi    */
+void silk_apply_sine_window_FLP(
+    silk_float                      px_win[],                           /* O    Pointer to windowed signal                  */
+    const silk_float                px[],                               /* I    Pointer to input signal                     */
+    const opus_int                  win_type,                           /* I    Selects a window type                       */
+    const opus_int                  length                              /* I    Window length, multiple of 4                */
+);
+
+/* Wrapper functions. Call flp / fix code */
+
+/* Convert AR filter coefficients to NLSF parameters */
+void silk_A2NLSF_FLP(
+    opus_int16                      *NLSF_Q15,                          /* O    NLSF vector      [ LPC_order ]              */
+    const silk_float                *pAR,                               /* I    LPC coefficients [ LPC_order ]              */
+    const opus_int                  LPC_order                           /* I    LPC order                                   */
+);
+
+/* Convert NLSF parameters to AR prediction filter coefficients */
+void silk_NLSF2A_FLP(
+    silk_float                      *pAR,                               /* O    LPC coefficients [ LPC_order ]              */
+    const opus_int16                *NLSF_Q15,                          /* I    NLSF vector      [ LPC_order ]              */
+    const opus_int                  LPC_order                           /* I    LPC order                                   */
+);
+
+/* Limit, stabilize, and quantize NLSFs */
+void silk_process_NLSFs_FLP(
+    silk_encoder_state              *psEncC,                            /* I/O  Encoder state                               */
+    silk_float                      PredCoef[ 2 ][ MAX_LPC_ORDER ],     /* O    Prediction coefficients                     */
+    opus_int16                      NLSF_Q15[      MAX_LPC_ORDER ],     /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
+    const opus_int16                prev_NLSF_Q15[ MAX_LPC_ORDER ]      /* I    Previous Normalized LSFs (0 - (2^15-1))     */
+);
+
+/* Floating-point Silk NSQ wrapper      */
+void silk_NSQ_wrapper_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    SideInfoIndices                 *psIndices,                         /* I/O  Quantization indices                        */
+    silk_nsq_state                  *psNSQ,                             /* I/O  Noise Shaping Quantzation state             */
+    opus_int8                       pulses[],                           /* O    Quantized pulse signal                      */
+    const silk_float                x[]                                 /* I    Prefiltered input signal                    */
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/float/noise_shape_analysis_FLP.c b/drivers/opus/silk/float/noise_shape_analysis_FLP.c
new file mode 100644
index 0000000000..f80e0b3d0e
--- /dev/null
+++ b/drivers/opus/silk/float/noise_shape_analysis_FLP.c
@@ -0,0 +1,365 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/* Compute gain to make warped filter coefficients have a zero mean log frequency response on a   */
+/* non-warped frequency scale. (So that it can be implemented with a minimum-phase monic filter.) */
+/* Note: A monic filter is one with the first coefficient equal to 1.0. In Silk we omit the first */
+/* coefficient in an array of coefficients, for monic filters.                                    */
+static OPUS_INLINE silk_float warped_gain(
+    const silk_float     *coefs,
+    silk_float           lambda,
+    opus_int             order
+) {
+    opus_int   i;
+    silk_float gain;
+
+    lambda = -lambda;
+    gain = coefs[ order - 1 ];
+    for( i = order - 2; i >= 0; i-- ) {
+        gain = lambda * gain + coefs[ i ];
+    }
+    return (silk_float)( 1.0f / ( 1.0f - lambda * gain ) );
+}
+
+/* Convert warped filter coefficients to monic pseudo-warped coefficients and limit maximum     */
+/* amplitude of monic warped coefficients by using bandwidth expansion on the true coefficients */
+static OPUS_INLINE void warped_true2monic_coefs(
+    silk_float           *coefs_syn,
+    silk_float           *coefs_ana,
+    silk_float           lambda,
+    silk_float           limit,
+    opus_int             order
+) {
+    opus_int   i, iter, ind = 0;
+    silk_float tmp, maxabs, chirp, gain_syn, gain_ana;
+
+    /* Convert to monic coefficients */
+    for( i = order - 1; i > 0; i-- ) {
+        coefs_syn[ i - 1 ] -= lambda * coefs_syn[ i ];
+        coefs_ana[ i - 1 ] -= lambda * coefs_ana[ i ];
+    }
+    gain_syn = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_syn[ 0 ] );
+    gain_ana = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_ana[ 0 ] );
+    for( i = 0; i < order; i++ ) {
+        coefs_syn[ i ] *= gain_syn;
+        coefs_ana[ i ] *= gain_ana;
+    }
+
+    /* Limit */
+    for( iter = 0; iter < 10; iter++ ) {
+        /* Find maximum absolute value */
+        maxabs = -1.0f;
+        for( i = 0; i < order; i++ ) {
+            tmp = silk_max( silk_abs_float( coefs_syn[ i ] ), silk_abs_float( coefs_ana[ i ] ) );
+            if( tmp > maxabs ) {
+                maxabs = tmp;
+                ind = i;
+            }
+        }
+        if( maxabs <= limit ) {
+            /* Coefficients are within range - done */
+            return;
+        }
+
+        /* Convert back to true warped coefficients */
+        for( i = 1; i < order; i++ ) {
+            coefs_syn[ i - 1 ] += lambda * coefs_syn[ i ];
+            coefs_ana[ i - 1 ] += lambda * coefs_ana[ i ];
+        }
+        gain_syn = 1.0f / gain_syn;
+        gain_ana = 1.0f / gain_ana;
+        for( i = 0; i < order; i++ ) {
+            coefs_syn[ i ] *= gain_syn;
+            coefs_ana[ i ] *= gain_ana;
+        }
+
+        /* Apply bandwidth expansion */
+        chirp = 0.99f - ( 0.8f + 0.1f * iter ) * ( maxabs - limit ) / ( maxabs * ( ind + 1 ) );
+        silk_bwexpander_FLP( coefs_syn, order, chirp );
+        silk_bwexpander_FLP( coefs_ana, order, chirp );
+
+        /* Convert to monic warped coefficients */
+        for( i = order - 1; i > 0; i-- ) {
+            coefs_syn[ i - 1 ] -= lambda * coefs_syn[ i ];
+            coefs_ana[ i - 1 ] -= lambda * coefs_ana[ i ];
+        }
+        gain_syn = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_syn[ 0 ] );
+        gain_ana = ( 1.0f - lambda * lambda ) / ( 1.0f + lambda * coefs_ana[ 0 ] );
+        for( i = 0; i < order; i++ ) {
+            coefs_syn[ i ] *= gain_syn;
+            coefs_ana[ i ] *= gain_ana;
+        }
+    }
+    silk_assert( 0 );
+}
+
+/* Compute noise shaping coefficients and initial gain values */
+void silk_noise_shape_analysis_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    const silk_float                *pitch_res,                         /* I    LPC residual from pitch analysis            */
+    const silk_float                *x                                  /* I    Input signal [frame_length + la_shape]      */
+)
+{
+    silk_shape_state_FLP *psShapeSt = &psEnc->sShape;
+    opus_int     k, nSamples;
+    silk_float   SNR_adj_dB, HarmBoost, HarmShapeGain, Tilt;
+    silk_float   nrg, pre_nrg, log_energy, log_energy_prev, energy_variation;
+    silk_float   delta, BWExp1, BWExp2, gain_mult, gain_add, strength, b, warping;
+    silk_float   x_windowed[ SHAPE_LPC_WIN_MAX ];
+    silk_float   auto_corr[ MAX_SHAPE_LPC_ORDER + 1 ];
+    const silk_float *x_ptr, *pitch_res_ptr;
+
+    /* Point to start of first LPC analysis block */
+    x_ptr = x - psEnc->sCmn.la_shape;
+
+    /****************/
+    /* GAIN CONTROL */
+    /****************/
+    SNR_adj_dB = psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f );
+
+    /* Input quality is the average of the quality in the lowest two VAD bands */
+    psEncCtrl->input_quality = 0.5f * ( psEnc->sCmn.input_quality_bands_Q15[ 0 ] + psEnc->sCmn.input_quality_bands_Q15[ 1 ] ) * ( 1.0f / 32768.0f );
+
+    /* Coding quality level, between 0.0 and 1.0 */
+    psEncCtrl->coding_quality = silk_sigmoid( 0.25f * ( SNR_adj_dB - 20.0f ) );
+
+    if( psEnc->sCmn.useCBR == 0 ) {
+        /* Reduce coding SNR during low speech activity */
+        b = 1.0f - psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f );
+        SNR_adj_dB -= BG_SNR_DECR_dB * psEncCtrl->coding_quality * ( 0.5f + 0.5f * psEncCtrl->input_quality ) * b * b;
+    }
+
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* Reduce gains for periodic signals */
+        SNR_adj_dB += HARM_SNR_INCR_dB * psEnc->LTPCorr;
+    } else {
+        /* For unvoiced signals and low-quality input, adjust the quality slower than SNR_dB setting */
+        SNR_adj_dB += ( -0.4f * psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) + 6.0f ) * ( 1.0f - psEncCtrl->input_quality );
+    }
+
+    /*************************/
+    /* SPARSENESS PROCESSING */
+    /*************************/
+    /* Set quantizer offset */
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* Initially set to 0; may be overruled in process_gains(..) */
+        psEnc->sCmn.indices.quantOffsetType = 0;
+        psEncCtrl->sparseness = 0.0f;
+    } else {
+        /* Sparseness measure, based on relative fluctuations of energy per 2 milliseconds */
+        nSamples = 2 * psEnc->sCmn.fs_kHz;
+        energy_variation = 0.0f;
+        log_energy_prev  = 0.0f;
+        pitch_res_ptr = pitch_res;
+        for( k = 0; k < silk_SMULBB( SUB_FRAME_LENGTH_MS, psEnc->sCmn.nb_subfr ) / 2; k++ ) {
+            nrg = ( silk_float )nSamples + ( silk_float )silk_energy_FLP( pitch_res_ptr, nSamples );
+            log_energy = silk_log2( nrg );
+            if( k > 0 ) {
+                energy_variation += silk_abs_float( log_energy - log_energy_prev );
+            }
+            log_energy_prev = log_energy;
+            pitch_res_ptr += nSamples;
+        }
+        psEncCtrl->sparseness = silk_sigmoid( 0.4f * ( energy_variation - 5.0f ) );
+
+        /* Set quantization offset depending on sparseness measure */
+        if( psEncCtrl->sparseness > SPARSENESS_THRESHOLD_QNT_OFFSET ) {
+            psEnc->sCmn.indices.quantOffsetType = 0;
+        } else {
+            psEnc->sCmn.indices.quantOffsetType = 1;
+        }
+
+        /* Increase coding SNR for sparse signals */
+        SNR_adj_dB += SPARSE_SNR_INCR_dB * ( psEncCtrl->sparseness - 0.5f );
+    }
+
+    /*******************************/
+    /* Control bandwidth expansion */
+    /*******************************/
+    /* More BWE for signals with high prediction gain */
+    strength = FIND_PITCH_WHITE_NOISE_FRACTION * psEncCtrl->predGain;           /* between 0.0 and 1.0 */
+    BWExp1 = BWExp2 = BANDWIDTH_EXPANSION / ( 1.0f + strength * strength );
+    delta  = LOW_RATE_BANDWIDTH_EXPANSION_DELTA * ( 1.0f - 0.75f * psEncCtrl->coding_quality );
+    BWExp1 -= delta;
+    BWExp2 += delta;
+    /* BWExp1 will be applied after BWExp2, so make it relative */
+    BWExp1 /= BWExp2;
+
+    if( psEnc->sCmn.warping_Q16 > 0 ) {
+        /* Slightly more warping in analysis will move quantization noise up in frequency, where it's better masked */
+        warping = (silk_float)psEnc->sCmn.warping_Q16 / 65536.0f + 0.01f * psEncCtrl->coding_quality;
+    } else {
+        warping = 0.0f;
+    }
+
+    /********************************************/
+    /* Compute noise shaping AR coefs and gains */
+    /********************************************/
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        /* Apply window: sine slope followed by flat part followed by cosine slope */
+        opus_int shift, slope_part, flat_part;
+        flat_part = psEnc->sCmn.fs_kHz * 3;
+        slope_part = ( psEnc->sCmn.shapeWinLength - flat_part ) / 2;
+
+        silk_apply_sine_window_FLP( x_windowed, x_ptr, 1, slope_part );
+        shift = slope_part;
+        silk_memcpy( x_windowed + shift, x_ptr + shift, flat_part * sizeof(silk_float) );
+        shift += flat_part;
+        silk_apply_sine_window_FLP( x_windowed + shift, x_ptr + shift, 2, slope_part );
+
+        /* Update pointer: next LPC analysis block */
+        x_ptr += psEnc->sCmn.subfr_length;
+
+        if( psEnc->sCmn.warping_Q16 > 0 ) {
+            /* Calculate warped auto correlation */
+            silk_warped_autocorrelation_FLP( auto_corr, x_windowed, warping,
+                psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder );
+        } else {
+            /* Calculate regular auto correlation */
+            silk_autocorrelation_FLP( auto_corr, x_windowed, psEnc->sCmn.shapeWinLength, psEnc->sCmn.shapingLPCOrder + 1 );
+        }
+
+        /* Add white noise, as a fraction of energy */
+        auto_corr[ 0 ] += auto_corr[ 0 ] * SHAPE_WHITE_NOISE_FRACTION;
+
+        /* Convert correlations to prediction coefficients, and compute residual energy */
+        nrg = silk_levinsondurbin_FLP( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], auto_corr, psEnc->sCmn.shapingLPCOrder );
+        psEncCtrl->Gains[ k ] = ( silk_float )sqrt( nrg );
+
+        if( psEnc->sCmn.warping_Q16 > 0 ) {
+            /* Adjust gain for warping */
+            psEncCtrl->Gains[ k ] *= warped_gain( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], warping, psEnc->sCmn.shapingLPCOrder );
+        }
+
+        /* Bandwidth expansion for synthesis filter shaping */
+        silk_bwexpander_FLP( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder, BWExp2 );
+
+        /* Compute noise shaping filter coefficients */
+        silk_memcpy(
+            &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ],
+            &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ],
+            psEnc->sCmn.shapingLPCOrder * sizeof( silk_float ) );
+
+        /* Bandwidth expansion for analysis filter shaping */
+        silk_bwexpander_FLP( &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder, BWExp1 );
+
+        /* Ratio of prediction gains, in energy domain */
+        pre_nrg = silk_LPC_inverse_pred_gain_FLP( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder );
+        nrg     = silk_LPC_inverse_pred_gain_FLP( &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ], psEnc->sCmn.shapingLPCOrder );
+        psEncCtrl->GainsPre[ k ] = 1.0f - 0.7f * ( 1.0f - pre_nrg / nrg );
+
+        /* Convert to monic warped prediction coefficients and limit absolute values */
+        warped_true2monic_coefs( &psEncCtrl->AR2[ k * MAX_SHAPE_LPC_ORDER ], &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ],
+            warping, 3.999f, psEnc->sCmn.shapingLPCOrder );
+    }
+
+    /*****************/
+    /* Gain tweaking */
+    /*****************/
+    /* Increase gains during low speech activity */
+    gain_mult = (silk_float)pow( 2.0f, -0.16f * SNR_adj_dB );
+    gain_add  = (silk_float)pow( 2.0f,  0.16f * MIN_QGAIN_DB );
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        psEncCtrl->Gains[ k ] *= gain_mult;
+        psEncCtrl->Gains[ k ] += gain_add;
+    }
+
+    gain_mult = 1.0f + INPUT_TILT + psEncCtrl->coding_quality * HIGH_RATE_INPUT_TILT;
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        psEncCtrl->GainsPre[ k ] *= gain_mult;
+    }
+
+    /************************************************/
+    /* Control low-frequency shaping and noise tilt */
+    /************************************************/
+    /* Less low frequency shaping for noisy inputs */
+    strength = LOW_FREQ_SHAPING * ( 1.0f + LOW_QUALITY_LOW_FREQ_SHAPING_DECR * ( psEnc->sCmn.input_quality_bands_Q15[ 0 ] * ( 1.0f / 32768.0f ) - 1.0f ) );
+    strength *= psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f );
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* Reduce low frequencies quantization noise for periodic signals, depending on pitch lag */
+        /*f = 400; freqz([1, -0.98 + 2e-4 * f], [1, -0.97 + 7e-4 * f], 2^12, Fs); axis([0, 1000, -10, 1])*/
+        for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+            b = 0.2f / psEnc->sCmn.fs_kHz + 3.0f / psEncCtrl->pitchL[ k ];
+            psEncCtrl->LF_MA_shp[ k ] = -1.0f + b;
+            psEncCtrl->LF_AR_shp[ k ] =  1.0f - b - b * strength;
+        }
+        Tilt = - HP_NOISE_COEF -
+            (1 - HP_NOISE_COEF) * HARM_HP_NOISE_COEF * psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f );
+    } else {
+        b = 1.3f / psEnc->sCmn.fs_kHz;
+        psEncCtrl->LF_MA_shp[ 0 ] = -1.0f + b;
+        psEncCtrl->LF_AR_shp[ 0 ] =  1.0f - b - b * strength * 0.6f;
+        for( k = 1; k < psEnc->sCmn.nb_subfr; k++ ) {
+            psEncCtrl->LF_MA_shp[ k ] = psEncCtrl->LF_MA_shp[ 0 ];
+            psEncCtrl->LF_AR_shp[ k ] = psEncCtrl->LF_AR_shp[ 0 ];
+        }
+        Tilt = -HP_NOISE_COEF;
+    }
+
+    /****************************/
+    /* HARMONIC SHAPING CONTROL */
+    /****************************/
+    /* Control boosting of harmonic frequencies */
+    HarmBoost = LOW_RATE_HARMONIC_BOOST * ( 1.0f - psEncCtrl->coding_quality ) * psEnc->LTPCorr;
+
+    /* More harmonic boost for noisy input signals */
+    HarmBoost += LOW_INPUT_QUALITY_HARMONIC_BOOST * ( 1.0f - psEncCtrl->input_quality );
+
+    if( USE_HARM_SHAPING && psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        /* Harmonic noise shaping */
+        HarmShapeGain = HARMONIC_SHAPING;
+
+        /* More harmonic noise shaping for high bitrates or noisy input */
+        HarmShapeGain += HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING *
+            ( 1.0f - ( 1.0f - psEncCtrl->coding_quality ) * psEncCtrl->input_quality );
+
+        /* Less harmonic noise shaping for less periodic signals */
+        HarmShapeGain *= ( silk_float )sqrt( psEnc->LTPCorr );
+    } else {
+        HarmShapeGain = 0.0f;
+    }
+
+    /*************************/
+    /* Smooth over subframes */
+    /*************************/
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        psShapeSt->HarmBoost_smth     += SUBFR_SMTH_COEF * ( HarmBoost - psShapeSt->HarmBoost_smth );
+        psEncCtrl->HarmBoost[ k ]      = psShapeSt->HarmBoost_smth;
+        psShapeSt->HarmShapeGain_smth += SUBFR_SMTH_COEF * ( HarmShapeGain - psShapeSt->HarmShapeGain_smth );
+        psEncCtrl->HarmShapeGain[ k ]  = psShapeSt->HarmShapeGain_smth;
+        psShapeSt->Tilt_smth          += SUBFR_SMTH_COEF * ( Tilt - psShapeSt->Tilt_smth );
+        psEncCtrl->Tilt[ k ]           = psShapeSt->Tilt_smth;
+    }
+}
diff --git a/drivers/opus/silk/float/pitch_analysis_core_FLP.c b/drivers/opus/silk/float/pitch_analysis_core_FLP.c
new file mode 100644
index 0000000000..2588094c49
--- /dev/null
+++ b/drivers/opus/silk/float/pitch_analysis_core_FLP.c
@@ -0,0 +1,630 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/*****************************************************************************
+* Pitch analyser function
+******************************************************************************/
+#include "SigProc_FLP.h"
+#include "SigProc_FIX.h"
+#include "pitch_est_defines.h"
+#include "pitch.h"
+
+#define SCRATCH_SIZE        22
+
+/************************************************************/
+/* Internally used functions                                */
+/************************************************************/
+static void silk_P_Ana_calc_corr_st3(
+    silk_float cross_corr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */
+    const silk_float    frame[],            /* I vector to correlate                                            */
+    opus_int            start_lag,          /* I start lag                                                      */
+    opus_int            sf_length,          /* I sub frame length                                               */
+    opus_int            nb_subfr,           /* I number of subframes                                            */
+    opus_int            complexity,         /* I Complexity setting                                             */
+    int                 arch                /* I Run-time architecture                                          */
+);
+
+static void silk_P_Ana_calc_energy_st3(
+    silk_float energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */
+    const silk_float    frame[],            /* I vector to correlate                                            */
+    opus_int            start_lag,          /* I start lag                                                      */
+    opus_int            sf_length,          /* I sub frame length                                               */
+    opus_int            nb_subfr,           /* I number of subframes                                            */
+    opus_int            complexity          /* I Complexity setting                                             */
+);
+
+/************************************************************/
+/* CORE PITCH ANALYSIS FUNCTION                             */
+/************************************************************/
+opus_int silk_pitch_analysis_core_FLP(      /* O    Voicing estimate: 0 voiced, 1 unvoiced                      */
+    const silk_float    *frame,             /* I    Signal of length PE_FRAME_LENGTH_MS*Fs_kHz                  */
+    opus_int            *pitch_out,         /* O    Pitch lag values [nb_subfr]                                 */
+    opus_int16          *lagIndex,          /* O    Lag Index                                                   */
+    opus_int8           *contourIndex,      /* O    Pitch contour Index                                         */
+    silk_float          *LTPCorr,           /* I/O  Normalized correlation; input: value from previous frame    */
+    opus_int            prevLag,            /* I    Last lag of previous frame; set to zero is unvoiced         */
+    const silk_float    search_thres1,      /* I    First stage threshold for lag candidates 0 - 1              */
+    const silk_float    search_thres2,      /* I    Final threshold for lag candidates 0 - 1                    */
+    const opus_int      Fs_kHz,             /* I    sample frequency (kHz)                                      */
+    const opus_int      complexity,         /* I    Complexity setting, 0-2, where 2 is highest                 */
+    const opus_int      nb_subfr,           /* I    Number of 5 ms subframes                                    */
+    int                 arch                /* I    Run-time architecture                                       */
+)
+{
+    opus_int   i, k, d, j;
+    silk_float frame_8kHz[  PE_MAX_FRAME_LENGTH_MS * 8 ];
+    silk_float frame_4kHz[  PE_MAX_FRAME_LENGTH_MS * 4 ];
+    opus_int16 frame_8_FIX[ PE_MAX_FRAME_LENGTH_MS * 8 ];
+    opus_int16 frame_4_FIX[ PE_MAX_FRAME_LENGTH_MS * 4 ];
+    opus_int32 filt_state[ 6 ];
+    silk_float threshold, contour_bias;
+    silk_float C[ PE_MAX_NB_SUBFR][ (PE_MAX_LAG >> 1) + 5 ];
+    opus_val32 xcorr[ PE_MAX_LAG_MS * 4 - PE_MIN_LAG_MS * 4 + 1 ];
+    silk_float CC[ PE_NB_CBKS_STAGE2_EXT ];
+    const silk_float *target_ptr, *basis_ptr;
+    double    cross_corr, normalizer, energy, energy_tmp;
+    opus_int   d_srch[ PE_D_SRCH_LENGTH ];
+    opus_int16 d_comp[ (PE_MAX_LAG >> 1) + 5 ];
+    opus_int   length_d_srch, length_d_comp;
+    silk_float Cmax, CCmax, CCmax_b, CCmax_new_b, CCmax_new;
+    opus_int   CBimax, CBimax_new, lag, start_lag, end_lag, lag_new;
+    opus_int   cbk_size;
+    silk_float lag_log2, prevLag_log2, delta_lag_log2_sqr;
+    silk_float energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ];
+    silk_float cross_corr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ];
+    opus_int   lag_counter;
+    opus_int   frame_length, frame_length_8kHz, frame_length_4kHz;
+    opus_int   sf_length, sf_length_8kHz, sf_length_4kHz;
+    opus_int   min_lag, min_lag_8kHz, min_lag_4kHz;
+    opus_int   max_lag, max_lag_8kHz, max_lag_4kHz;
+    opus_int   nb_cbk_search;
+    const opus_int8 *Lag_CB_ptr;
+
+    /* Check for valid sampling frequency */
+    silk_assert( Fs_kHz == 8 || Fs_kHz == 12 || Fs_kHz == 16 );
+
+    /* Check for valid complexity setting */
+    silk_assert( complexity >= SILK_PE_MIN_COMPLEX );
+    silk_assert( complexity <= SILK_PE_MAX_COMPLEX );
+
+    silk_assert( search_thres1 >= 0.0f && search_thres1 <= 1.0f );
+    silk_assert( search_thres2 >= 0.0f && search_thres2 <= 1.0f );
+
+    /* Set up frame lengths max / min lag for the sampling frequency */
+    frame_length      = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * Fs_kHz;
+    frame_length_4kHz = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * 4;
+    frame_length_8kHz = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * 8;
+    sf_length         = PE_SUBFR_LENGTH_MS * Fs_kHz;
+    sf_length_4kHz    = PE_SUBFR_LENGTH_MS * 4;
+    sf_length_8kHz    = PE_SUBFR_LENGTH_MS * 8;
+    min_lag           = PE_MIN_LAG_MS * Fs_kHz;
+    min_lag_4kHz      = PE_MIN_LAG_MS * 4;
+    min_lag_8kHz      = PE_MIN_LAG_MS * 8;
+    max_lag           = PE_MAX_LAG_MS * Fs_kHz - 1;
+    max_lag_4kHz      = PE_MAX_LAG_MS * 4;
+    max_lag_8kHz      = PE_MAX_LAG_MS * 8 - 1;
+
+    /* Resample from input sampled at Fs_kHz to 8 kHz */
+    if( Fs_kHz == 16 ) {
+        /* Resample to 16 -> 8 khz */
+        opus_int16 frame_16_FIX[ 16 * PE_MAX_FRAME_LENGTH_MS ];
+        silk_float2short_array( frame_16_FIX, frame, frame_length );
+        silk_memset( filt_state, 0, 2 * sizeof( opus_int32 ) );
+        silk_resampler_down2( filt_state, frame_8_FIX, frame_16_FIX, frame_length );
+        silk_short2float_array( frame_8kHz, frame_8_FIX, frame_length_8kHz );
+    } else if( Fs_kHz == 12 ) {
+        /* Resample to 12 -> 8 khz */
+        opus_int16 frame_12_FIX[ 12 * PE_MAX_FRAME_LENGTH_MS ];
+        silk_float2short_array( frame_12_FIX, frame, frame_length );
+        silk_memset( filt_state, 0, 6 * sizeof( opus_int32 ) );
+        silk_resampler_down2_3( filt_state, frame_8_FIX, frame_12_FIX, frame_length );
+        silk_short2float_array( frame_8kHz, frame_8_FIX, frame_length_8kHz );
+    } else {
+        silk_assert( Fs_kHz == 8 );
+        silk_float2short_array( frame_8_FIX, frame, frame_length_8kHz );
+    }
+
+    /* Decimate again to 4 kHz */
+    silk_memset( filt_state, 0, 2 * sizeof( opus_int32 ) );
+    silk_resampler_down2( filt_state, frame_4_FIX, frame_8_FIX, frame_length_8kHz );
+    silk_short2float_array( frame_4kHz, frame_4_FIX, frame_length_4kHz );
+
+    /* Low-pass filter */
+    for( i = frame_length_4kHz - 1; i > 0; i-- ) {
+        frame_4kHz[ i ] += frame_4kHz[ i - 1 ];
+    }
+
+    /******************************************************************************
+    * FIRST STAGE, operating in 4 khz
+    ******************************************************************************/
+    silk_memset(C, 0, sizeof(silk_float) * nb_subfr * ((PE_MAX_LAG >> 1) + 5));
+    target_ptr = &frame_4kHz[ silk_LSHIFT( sf_length_4kHz, 2 ) ];
+    for( k = 0; k < nb_subfr >> 1; k++ ) {
+        /* Check that we are within range of the array */
+        silk_assert( target_ptr >= frame_4kHz );
+        silk_assert( target_ptr + sf_length_8kHz <= frame_4kHz + frame_length_4kHz );
+
+        basis_ptr = target_ptr - min_lag_4kHz;
+
+        /* Check that we are within range of the array */
+        silk_assert( basis_ptr >= frame_4kHz );
+        silk_assert( basis_ptr + sf_length_8kHz <= frame_4kHz + frame_length_4kHz );
+
+        celt_pitch_xcorr( target_ptr, target_ptr-max_lag_4kHz, xcorr, sf_length_8kHz, max_lag_4kHz - min_lag_4kHz + 1, arch );
+
+        /* Calculate first vector products before loop */
+        cross_corr = xcorr[ max_lag_4kHz - min_lag_4kHz ];
+        normalizer = silk_energy_FLP( target_ptr, sf_length_8kHz ) + 
+                     silk_energy_FLP( basis_ptr,  sf_length_8kHz ) + 
+                     sf_length_8kHz * 4000.0f;
+
+        C[ 0 ][ min_lag_4kHz ] += (silk_float)( 2 * cross_corr / normalizer );
+
+        /* From now on normalizer is computed recursively */
+        for( d = min_lag_4kHz + 1; d <= max_lag_4kHz; d++ ) {
+            basis_ptr--;
+
+            /* Check that we are within range of the array */
+            silk_assert( basis_ptr >= frame_4kHz );
+            silk_assert( basis_ptr + sf_length_8kHz <= frame_4kHz + frame_length_4kHz );
+
+            cross_corr = xcorr[ max_lag_4kHz - d ];
+
+            /* Add contribution of new sample and remove contribution from oldest sample */
+            normalizer +=
+                basis_ptr[ 0 ] * (double)basis_ptr[ 0 ] -
+                basis_ptr[ sf_length_8kHz ] * (double)basis_ptr[ sf_length_8kHz ];
+            C[ 0 ][ d ] += (silk_float)( 2 * cross_corr / normalizer );
+        }
+        /* Update target pointer */
+        target_ptr += sf_length_8kHz;
+    }
+
+    /* Apply short-lag bias */
+    for( i = max_lag_4kHz; i >= min_lag_4kHz; i-- ) {
+        C[ 0 ][ i ] -= C[ 0 ][ i ] * i / 4096.0f;
+    }
+
+    /* Sort */
+    length_d_srch = 4 + 2 * complexity;
+    silk_assert( 3 * length_d_srch <= PE_D_SRCH_LENGTH );
+    silk_insertion_sort_decreasing_FLP( &C[ 0 ][ min_lag_4kHz ], d_srch, max_lag_4kHz - min_lag_4kHz + 1, length_d_srch );
+
+    /* Escape if correlation is very low already here */
+    Cmax = C[ 0 ][ min_lag_4kHz ];
+    if( Cmax < 0.2f ) {
+        silk_memset( pitch_out, 0, nb_subfr * sizeof( opus_int ) );
+        *LTPCorr      = 0.0f;
+        *lagIndex     = 0;
+        *contourIndex = 0;
+        return 1;
+    }
+
+    threshold = search_thres1 * Cmax;
+    for( i = 0; i < length_d_srch; i++ ) {
+        /* Convert to 8 kHz indices for the sorted correlation that exceeds the threshold */
+        if( C[ 0 ][ min_lag_4kHz + i ] > threshold ) {
+            d_srch[ i ] = silk_LSHIFT( d_srch[ i ] + min_lag_4kHz, 1 );
+        } else {
+            length_d_srch = i;
+            break;
+        }
+    }
+    silk_assert( length_d_srch > 0 );
+
+    for( i = min_lag_8kHz - 5; i < max_lag_8kHz + 5; i++ ) {
+        d_comp[ i ] = 0;
+    }
+    for( i = 0; i < length_d_srch; i++ ) {
+        d_comp[ d_srch[ i ] ] = 1;
+    }
+
+    /* Convolution */
+    for( i = max_lag_8kHz + 3; i >= min_lag_8kHz; i-- ) {
+        d_comp[ i ] += d_comp[ i - 1 ] + d_comp[ i - 2 ];
+    }
+
+    length_d_srch = 0;
+    for( i = min_lag_8kHz; i < max_lag_8kHz + 1; i++ ) {
+        if( d_comp[ i + 1 ] > 0 ) {
+            d_srch[ length_d_srch ] = i;
+            length_d_srch++;
+        }
+    }
+
+    /* Convolution */
+    for( i = max_lag_8kHz + 3; i >= min_lag_8kHz; i-- ) {
+        d_comp[ i ] += d_comp[ i - 1 ] + d_comp[ i - 2 ] + d_comp[ i - 3 ];
+    }
+
+    length_d_comp = 0;
+    for( i = min_lag_8kHz; i < max_lag_8kHz + 4; i++ ) {
+        if( d_comp[ i ] > 0 ) {
+            d_comp[ length_d_comp ] = (opus_int16)( i - 2 );
+            length_d_comp++;
+        }
+    }
+
+    /**********************************************************************************
+    ** SECOND STAGE, operating at 8 kHz, on lag sections with high correlation
+    *************************************************************************************/
+    /*********************************************************************************
+    * Find energy of each subframe projected onto its history, for a range of delays
+    *********************************************************************************/
+    silk_memset( C, 0, PE_MAX_NB_SUBFR*((PE_MAX_LAG >> 1) + 5) * sizeof(silk_float));
+
+    if( Fs_kHz == 8 ) {
+        target_ptr = &frame[ PE_LTP_MEM_LENGTH_MS * 8 ];
+    } else {
+        target_ptr = &frame_8kHz[ PE_LTP_MEM_LENGTH_MS * 8 ];
+    }
+    for( k = 0; k < nb_subfr; k++ ) {
+        energy_tmp = silk_energy_FLP( target_ptr, sf_length_8kHz ) + 1.0;
+        for( j = 0; j < length_d_comp; j++ ) {
+            d = d_comp[ j ];
+            basis_ptr = target_ptr - d;
+            cross_corr = silk_inner_product_FLP( basis_ptr, target_ptr, sf_length_8kHz );
+            if( cross_corr > 0.0f ) {
+                energy = silk_energy_FLP( basis_ptr, sf_length_8kHz );
+                C[ k ][ d ] = (silk_float)( 2 * cross_corr / ( energy + energy_tmp ) );
+            } else {
+                C[ k ][ d ] = 0.0f;
+            }
+        }
+        target_ptr += sf_length_8kHz;
+    }
+
+    /* search over lag range and lags codebook */
+    /* scale factor for lag codebook, as a function of center lag */
+
+    CCmax   = 0.0f; /* This value doesn't matter */
+    CCmax_b = -1000.0f;
+
+    CBimax = 0; /* To avoid returning undefined lag values */
+    lag = -1;   /* To check if lag with strong enough correlation has been found */
+
+    if( prevLag > 0 ) {
+        if( Fs_kHz == 12 ) {
+            prevLag = silk_LSHIFT( prevLag, 1 ) / 3;
+        } else if( Fs_kHz == 16 ) {
+            prevLag = silk_RSHIFT( prevLag, 1 );
+        }
+        prevLag_log2 = silk_log2( (silk_float)prevLag );
+    } else {
+        prevLag_log2 = 0;
+    }
+
+    /* Set up stage 2 codebook based on number of subframes */
+    if( nb_subfr == PE_MAX_NB_SUBFR ) {
+        cbk_size   = PE_NB_CBKS_STAGE2_EXT;
+        Lag_CB_ptr = &silk_CB_lags_stage2[ 0 ][ 0 ];
+        if( Fs_kHz == 8 && complexity > SILK_PE_MIN_COMPLEX ) {
+            /* If input is 8 khz use a larger codebook here because it is last stage */
+            nb_cbk_search = PE_NB_CBKS_STAGE2_EXT;
+        } else {
+            nb_cbk_search = PE_NB_CBKS_STAGE2;
+        }
+    } else {
+        cbk_size       = PE_NB_CBKS_STAGE2_10MS;
+        Lag_CB_ptr     = &silk_CB_lags_stage2_10_ms[ 0 ][ 0 ];
+        nb_cbk_search  = PE_NB_CBKS_STAGE2_10MS;
+    }
+
+    for( k = 0; k < length_d_srch; k++ ) {
+        d = d_srch[ k ];
+        for( j = 0; j < nb_cbk_search; j++ ) {
+            CC[j] = 0.0f;
+            for( i = 0; i < nb_subfr; i++ ) {
+                /* Try all codebooks */
+                CC[ j ] += C[ i ][ d + matrix_ptr( Lag_CB_ptr, i, j, cbk_size )];
+            }
+        }
+        /* Find best codebook */
+        CCmax_new  = -1000.0f;
+        CBimax_new = 0;
+        for( i = 0; i < nb_cbk_search; i++ ) {
+            if( CC[ i ] > CCmax_new ) {
+                CCmax_new = CC[ i ];
+                CBimax_new = i;
+            }
+        }
+
+        /* Bias towards shorter lags */
+        lag_log2 = silk_log2( (silk_float)d );
+        CCmax_new_b = CCmax_new - PE_SHORTLAG_BIAS * nb_subfr * lag_log2;
+
+        /* Bias towards previous lag */
+        if( prevLag > 0 ) {
+            delta_lag_log2_sqr = lag_log2 - prevLag_log2;
+            delta_lag_log2_sqr *= delta_lag_log2_sqr;
+            CCmax_new_b -= PE_PREVLAG_BIAS * nb_subfr * (*LTPCorr) * delta_lag_log2_sqr / ( delta_lag_log2_sqr + 0.5f );
+        }
+
+        if( CCmax_new_b > CCmax_b &&                /* Find maximum biased correlation                  */
+            CCmax_new > nb_subfr * search_thres2    /* Correlation needs to be high enough to be voiced */
+        ) {
+            CCmax_b = CCmax_new_b;
+            CCmax   = CCmax_new;
+            lag     = d;
+            CBimax  = CBimax_new;
+        }
+    }
+
+    if( lag == -1 ) {
+        /* No suitable candidate found */
+        silk_memset( pitch_out, 0, PE_MAX_NB_SUBFR * sizeof(opus_int) );
+        *LTPCorr      = 0.0f;
+        *lagIndex     = 0;
+        *contourIndex = 0;
+        return 1;
+    }
+
+    /* Output normalized correlation */
+    *LTPCorr = (silk_float)( CCmax / nb_subfr );
+    silk_assert( *LTPCorr >= 0.0f );
+
+    if( Fs_kHz > 8 ) {
+        /* Search in original signal */
+
+        /* Compensate for decimation */
+        silk_assert( lag == silk_SAT16( lag ) );
+        if( Fs_kHz == 12 ) {
+            lag = silk_RSHIFT_ROUND( silk_SMULBB( lag, 3 ), 1 );
+        } else { /* Fs_kHz == 16 */
+            lag = silk_LSHIFT( lag, 1 );
+        }
+
+        lag = silk_LIMIT_int( lag, min_lag, max_lag );
+        start_lag = silk_max_int( lag - 2, min_lag );
+        end_lag   = silk_min_int( lag + 2, max_lag );
+        lag_new   = lag;                                    /* to avoid undefined lag */
+        CBimax    = 0;                                      /* to avoid undefined lag */
+
+        CCmax = -1000.0f;
+
+        /* Calculate the correlations and energies needed in stage 3 */
+        silk_P_Ana_calc_corr_st3( cross_corr_st3, frame, start_lag, sf_length, nb_subfr, complexity, arch );
+        silk_P_Ana_calc_energy_st3( energies_st3, frame, start_lag, sf_length, nb_subfr, complexity );
+
+        lag_counter = 0;
+        silk_assert( lag == silk_SAT16( lag ) );
+        contour_bias = PE_FLATCONTOUR_BIAS / lag;
+
+        /* Set up cbk parameters according to complexity setting and frame length */
+        if( nb_subfr == PE_MAX_NB_SUBFR ) {
+            nb_cbk_search = (opus_int)silk_nb_cbk_searchs_stage3[ complexity ];
+            cbk_size      = PE_NB_CBKS_STAGE3_MAX;
+            Lag_CB_ptr    = &silk_CB_lags_stage3[ 0 ][ 0 ];
+        } else {
+            nb_cbk_search = PE_NB_CBKS_STAGE3_10MS;
+            cbk_size      = PE_NB_CBKS_STAGE3_10MS;
+            Lag_CB_ptr    = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];
+        }
+
+        target_ptr = &frame[ PE_LTP_MEM_LENGTH_MS * Fs_kHz ];
+        energy_tmp = silk_energy_FLP( target_ptr, nb_subfr * sf_length ) + 1.0;
+        for( d = start_lag; d <= end_lag; d++ ) {
+            for( j = 0; j < nb_cbk_search; j++ ) {
+                cross_corr = 0.0;
+                energy = energy_tmp;
+                for( k = 0; k < nb_subfr; k++ ) {
+                    cross_corr += cross_corr_st3[ k ][ j ][ lag_counter ];
+                    energy     +=   energies_st3[ k ][ j ][ lag_counter ];
+                }
+                if( cross_corr > 0.0 ) {
+                    CCmax_new = (silk_float)( 2 * cross_corr / energy );
+                    /* Reduce depending on flatness of contour */
+                    CCmax_new *= 1.0f - contour_bias * j;
+                } else {
+                    CCmax_new = 0.0f;
+                }
+
+                if( CCmax_new > CCmax && ( d + (opus_int)silk_CB_lags_stage3[ 0 ][ j ] ) <= max_lag ) {
+                    CCmax   = CCmax_new;
+                    lag_new = d;
+                    CBimax  = j;
+                }
+            }
+            lag_counter++;
+        }
+
+        for( k = 0; k < nb_subfr; k++ ) {
+            pitch_out[ k ] = lag_new + matrix_ptr( Lag_CB_ptr, k, CBimax, cbk_size );
+            pitch_out[ k ] = silk_LIMIT( pitch_out[ k ], min_lag, PE_MAX_LAG_MS * Fs_kHz );
+        }
+        *lagIndex = (opus_int16)( lag_new - min_lag );
+        *contourIndex = (opus_int8)CBimax;
+    } else {        /* Fs_kHz == 8 */
+        /* Save Lags */
+        for( k = 0; k < nb_subfr; k++ ) {
+            pitch_out[ k ] = lag + matrix_ptr( Lag_CB_ptr, k, CBimax, cbk_size );
+            pitch_out[ k ] = silk_LIMIT( pitch_out[ k ], min_lag_8kHz, PE_MAX_LAG_MS * 8 );
+        }
+        *lagIndex = (opus_int16)( lag - min_lag_8kHz );
+        *contourIndex = (opus_int8)CBimax;
+    }
+    silk_assert( *lagIndex >= 0 );
+    /* return as voiced */
+    return 0;
+}
+
+/***********************************************************************
+ * Calculates the correlations used in stage 3 search. In order to cover
+ * the whole lag codebook for all the searched offset lags (lag +- 2),
+ * the following correlations are needed in each sub frame:
+ *
+ * sf1: lag range [-8,...,7] total 16 correlations
+ * sf2: lag range [-4,...,4] total 9 correlations
+ * sf3: lag range [-3,....4] total 8 correltions
+ * sf4: lag range [-6,....8] total 15 correlations
+ *
+ * In total 48 correlations. The direct implementation computed in worst
+ * case 4*12*5 = 240 correlations, but more likely around 120.
+ ***********************************************************************/
+static void silk_P_Ana_calc_corr_st3(
+    silk_float cross_corr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */
+    const silk_float    frame[],            /* I vector to correlate                                            */
+    opus_int            start_lag,          /* I start lag                                                      */
+    opus_int            sf_length,          /* I sub frame length                                               */
+    opus_int            nb_subfr,           /* I number of subframes                                            */
+    opus_int            complexity,         /* I Complexity setting                                             */
+    int                 arch                /* I Run-time architecture                                          */
+)
+{
+    const silk_float *target_ptr;
+    opus_int   i, j, k, lag_counter, lag_low, lag_high;
+    opus_int   nb_cbk_search, delta, idx, cbk_size;
+    silk_float scratch_mem[ SCRATCH_SIZE ];
+    opus_val32 xcorr[ SCRATCH_SIZE ];
+    const opus_int8 *Lag_range_ptr, *Lag_CB_ptr;
+
+    silk_assert( complexity >= SILK_PE_MIN_COMPLEX );
+    silk_assert( complexity <= SILK_PE_MAX_COMPLEX );
+
+    if( nb_subfr == PE_MAX_NB_SUBFR ) {
+        Lag_range_ptr = &silk_Lag_range_stage3[ complexity ][ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3[ 0 ][ 0 ];
+        nb_cbk_search = silk_nb_cbk_searchs_stage3[ complexity ];
+        cbk_size      = PE_NB_CBKS_STAGE3_MAX;
+    } else {
+        silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1);
+        Lag_range_ptr = &silk_Lag_range_stage3_10_ms[ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];
+        nb_cbk_search = PE_NB_CBKS_STAGE3_10MS;
+        cbk_size      = PE_NB_CBKS_STAGE3_10MS;
+    }
+
+    target_ptr = &frame[ silk_LSHIFT( sf_length, 2 ) ]; /* Pointer to middle of frame */
+    for( k = 0; k < nb_subfr; k++ ) {
+        lag_counter = 0;
+
+        /* Calculate the correlations for each subframe */
+        lag_low  = matrix_ptr( Lag_range_ptr, k, 0, 2 );
+        lag_high = matrix_ptr( Lag_range_ptr, k, 1, 2 );
+        silk_assert(lag_high-lag_low+1 <= SCRATCH_SIZE);
+        celt_pitch_xcorr( target_ptr, target_ptr - start_lag - lag_high, xcorr, sf_length, lag_high - lag_low + 1, arch );
+        for( j = lag_low; j <= lag_high; j++ ) {
+            silk_assert( lag_counter < SCRATCH_SIZE );
+            scratch_mem[ lag_counter ] = xcorr[ lag_high - j ];
+            lag_counter++;
+        }
+
+        delta = matrix_ptr( Lag_range_ptr, k, 0, 2 );
+        for( i = 0; i < nb_cbk_search; i++ ) {
+            /* Fill out the 3 dim array that stores the correlations for */
+            /* each code_book vector for each start lag */
+            idx = matrix_ptr( Lag_CB_ptr, k, i, cbk_size ) - delta;
+            for( j = 0; j < PE_NB_STAGE3_LAGS; j++ ) {
+                silk_assert( idx + j < SCRATCH_SIZE );
+                silk_assert( idx + j < lag_counter );
+                cross_corr_st3[ k ][ i ][ j ] = scratch_mem[ idx + j ];
+            }
+        }
+        target_ptr += sf_length;
+    }
+}
+
+/********************************************************************/
+/* Calculate the energies for first two subframes. The energies are */
+/* calculated recursively.                                          */
+/********************************************************************/
+static void silk_P_Ana_calc_energy_st3(
+    silk_float energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */
+    const silk_float    frame[],            /* I vector to correlate                                            */
+    opus_int            start_lag,          /* I start lag                                                      */
+    opus_int            sf_length,          /* I sub frame length                                               */
+    opus_int            nb_subfr,           /* I number of subframes                                            */
+    opus_int            complexity          /* I Complexity setting                                             */
+)
+{
+    const silk_float *target_ptr, *basis_ptr;
+    double    energy;
+    opus_int   k, i, j, lag_counter;
+    opus_int   nb_cbk_search, delta, idx, cbk_size, lag_diff;
+    silk_float scratch_mem[ SCRATCH_SIZE ];
+    const opus_int8 *Lag_range_ptr, *Lag_CB_ptr;
+
+    silk_assert( complexity >= SILK_PE_MIN_COMPLEX );
+    silk_assert( complexity <= SILK_PE_MAX_COMPLEX );
+
+    if( nb_subfr == PE_MAX_NB_SUBFR ) {
+        Lag_range_ptr = &silk_Lag_range_stage3[ complexity ][ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3[ 0 ][ 0 ];
+        nb_cbk_search = silk_nb_cbk_searchs_stage3[ complexity ];
+        cbk_size      = PE_NB_CBKS_STAGE3_MAX;
+    } else {
+        silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1);
+        Lag_range_ptr = &silk_Lag_range_stage3_10_ms[ 0 ][ 0 ];
+        Lag_CB_ptr    = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];
+        nb_cbk_search = PE_NB_CBKS_STAGE3_10MS;
+        cbk_size      = PE_NB_CBKS_STAGE3_10MS;
+    }
+
+    target_ptr = &frame[ silk_LSHIFT( sf_length, 2 ) ];
+    for( k = 0; k < nb_subfr; k++ ) {
+        lag_counter = 0;
+
+        /* Calculate the energy for first lag */
+        basis_ptr = target_ptr - ( start_lag + matrix_ptr( Lag_range_ptr, k, 0, 2 ) );
+        energy = silk_energy_FLP( basis_ptr, sf_length ) + 1e-3;
+        silk_assert( energy >= 0.0 );
+        scratch_mem[lag_counter] = (silk_float)energy;
+        lag_counter++;
+
+        lag_diff = ( matrix_ptr( Lag_range_ptr, k, 1, 2 ) -  matrix_ptr( Lag_range_ptr, k, 0, 2 ) + 1 );
+        for( i = 1; i < lag_diff; i++ ) {
+            /* remove part outside new window */
+            energy -= basis_ptr[sf_length - i] * (double)basis_ptr[sf_length - i];
+            silk_assert( energy >= 0.0 );
+
+            /* add part that comes into window */
+            energy += basis_ptr[ -i ] * (double)basis_ptr[ -i ];
+            silk_assert( energy >= 0.0 );
+            silk_assert( lag_counter < SCRATCH_SIZE );
+            scratch_mem[lag_counter] = (silk_float)energy;
+            lag_counter++;
+        }
+
+        delta = matrix_ptr( Lag_range_ptr, k, 0, 2 );
+        for( i = 0; i < nb_cbk_search; i++ ) {
+            /* Fill out the 3 dim array that stores the correlations for    */
+            /* each code_book vector for each start lag                     */
+            idx = matrix_ptr( Lag_CB_ptr, k, i, cbk_size ) - delta;
+            for( j = 0; j < PE_NB_STAGE3_LAGS; j++ ) {
+                silk_assert( idx + j < SCRATCH_SIZE );
+                silk_assert( idx + j < lag_counter );
+                energies_st3[ k ][ i ][ j ] = scratch_mem[ idx + j ];
+                silk_assert( energies_st3[ k ][ i ][ j ] >= 0.0f );
+            }
+        }
+        target_ptr += sf_length;
+    }
+}
diff --git a/drivers/opus/silk/float/prefilter_FLP.c b/drivers/opus/silk/float/prefilter_FLP.c
new file mode 100644
index 0000000000..aa43852ff1
--- /dev/null
+++ b/drivers/opus/silk/float/prefilter_FLP.c
@@ -0,0 +1,206 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/*
+* Prefilter for finding Quantizer input signal
+*/
+static OPUS_INLINE void silk_prefilt_FLP(
+    silk_prefilter_state_FLP    *P,                 /* I/O state */
+    silk_float                  st_res[],           /* I */
+    silk_float                  xw[],               /* O */
+    silk_float                  *HarmShapeFIR,      /* I */
+    silk_float                  Tilt,               /* I */
+    silk_float                  LF_MA_shp,          /* I */
+    silk_float                  LF_AR_shp,          /* I */
+    opus_int                    lag,                /* I */
+    opus_int                    length              /* I */
+);
+
+static void silk_warped_LPC_analysis_filter_FLP(
+          silk_float                 state[],            /* I/O  State [order + 1]                       */
+          silk_float                 res[],              /* O    Residual signal [length]                */
+    const silk_float                 coef[],             /* I    Coefficients [order]                    */
+    const silk_float                 input[],            /* I    Input signal [length]                   */
+    const silk_float                 lambda,             /* I    Warping factor                          */
+    const opus_int                   length,             /* I    Length of input signal                  */
+    const opus_int                   order               /* I    Filter order (even)                     */
+)
+{
+    opus_int     n, i;
+    silk_float   acc, tmp1, tmp2;
+
+    /* Order must be even */
+    silk_assert( ( order & 1 ) == 0 );
+
+    for( n = 0; n < length; n++ ) {
+        /* Output of lowpass section */
+        tmp2 = state[ 0 ] + lambda * state[ 1 ];
+        state[ 0 ] = input[ n ];
+        /* Output of allpass section */
+        tmp1 = state[ 1 ] + lambda * ( state[ 2 ] - tmp2 );
+        state[ 1 ] = tmp2;
+        acc = coef[ 0 ] * tmp2;
+        /* Loop over allpass sections */
+        for( i = 2; i < order; i += 2 ) {
+            /* Output of allpass section */
+            tmp2 = state[ i ] + lambda * ( state[ i + 1 ] - tmp1 );
+            state[ i ] = tmp1;
+            acc += coef[ i - 1 ] * tmp1;
+            /* Output of allpass section */
+            tmp1 = state[ i + 1 ] + lambda * ( state[ i + 2 ] - tmp2 );
+            state[ i + 1 ] = tmp2;
+            acc += coef[ i ] * tmp2;
+        }
+        state[ order ] = tmp1;
+        acc += coef[ order - 1 ] * tmp1;
+        res[ n ] = input[ n ] - acc;
+    }
+}
+
+/*
+* silk_prefilter. Main prefilter function
+*/
+void silk_prefilter_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    const silk_encoder_control_FLP  *psEncCtrl,                         /* I    Encoder control FLP                         */
+    silk_float                      xw[],                               /* O    Weighted signal                             */
+    const silk_float                x[]                                 /* I    Speech signal                               */
+)
+{
+    silk_prefilter_state_FLP *P = &psEnc->sPrefilt;
+    opus_int   j, k, lag;
+    silk_float HarmShapeGain, Tilt, LF_MA_shp, LF_AR_shp;
+    silk_float B[ 2 ];
+    const silk_float *AR1_shp;
+    const silk_float *px;
+    silk_float *pxw;
+    silk_float HarmShapeFIR[ 3 ];
+    silk_float st_res[ MAX_SUB_FRAME_LENGTH + MAX_LPC_ORDER ];
+
+    /* Set up pointers */
+    px  = x;
+    pxw = xw;
+    lag = P->lagPrev;
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        /* Update Variables that change per sub frame */
+        if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+            lag = psEncCtrl->pitchL[ k ];
+        }
+
+        /* Noise shape parameters */
+        HarmShapeGain = psEncCtrl->HarmShapeGain[ k ] * ( 1.0f - psEncCtrl->HarmBoost[ k ] );
+        HarmShapeFIR[ 0 ] = 0.25f               * HarmShapeGain;
+        HarmShapeFIR[ 1 ] = 32767.0f / 65536.0f * HarmShapeGain;
+        HarmShapeFIR[ 2 ] = 0.25f               * HarmShapeGain;
+        Tilt      =  psEncCtrl->Tilt[ k ];
+        LF_MA_shp =  psEncCtrl->LF_MA_shp[ k ];
+        LF_AR_shp =  psEncCtrl->LF_AR_shp[ k ];
+        AR1_shp   = &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ];
+
+        /* Short term FIR filtering */
+        silk_warped_LPC_analysis_filter_FLP( P->sAR_shp, st_res, AR1_shp, px,
+            (silk_float)psEnc->sCmn.warping_Q16 / 65536.0f, psEnc->sCmn.subfr_length, psEnc->sCmn.shapingLPCOrder );
+
+        /* Reduce (mainly) low frequencies during harmonic emphasis */
+        B[ 0 ] =  psEncCtrl->GainsPre[ k ];
+        B[ 1 ] = -psEncCtrl->GainsPre[ k ] *
+            ( psEncCtrl->HarmBoost[ k ] * HarmShapeGain + INPUT_TILT + psEncCtrl->coding_quality * HIGH_RATE_INPUT_TILT );
+        pxw[ 0 ] = B[ 0 ] * st_res[ 0 ] + B[ 1 ] * P->sHarmHP;
+        for( j = 1; j < psEnc->sCmn.subfr_length; j++ ) {
+            pxw[ j ] = B[ 0 ] * st_res[ j ] + B[ 1 ] * st_res[ j - 1 ];
+        }
+        P->sHarmHP = st_res[ psEnc->sCmn.subfr_length - 1 ];
+
+        silk_prefilt_FLP( P, pxw, pxw, HarmShapeFIR, Tilt, LF_MA_shp, LF_AR_shp, lag, psEnc->sCmn.subfr_length );
+
+        px  += psEnc->sCmn.subfr_length;
+        pxw += psEnc->sCmn.subfr_length;
+    }
+    P->lagPrev = psEncCtrl->pitchL[ psEnc->sCmn.nb_subfr - 1 ];
+}
+
+/*
+* Prefilter for finding Quantizer input signal
+*/
+static OPUS_INLINE void silk_prefilt_FLP(
+    silk_prefilter_state_FLP    *P,                 /* I/O state */
+    silk_float                  st_res[],           /* I */
+    silk_float                  xw[],               /* O */
+    silk_float                  *HarmShapeFIR,      /* I */
+    silk_float                  Tilt,               /* I */
+    silk_float                  LF_MA_shp,          /* I */
+    silk_float                  LF_AR_shp,          /* I */
+    opus_int                    lag,                /* I */
+    opus_int                    length              /* I */
+)
+{
+    opus_int   i;
+    opus_int   idx, LTP_shp_buf_idx;
+    silk_float n_Tilt, n_LF, n_LTP;
+    silk_float sLF_AR_shp, sLF_MA_shp;
+    silk_float *LTP_shp_buf;
+
+    /* To speed up use temp variables instead of using the struct */
+    LTP_shp_buf     = P->sLTP_shp;
+    LTP_shp_buf_idx = P->sLTP_shp_buf_idx;
+    sLF_AR_shp      = P->sLF_AR_shp;
+    sLF_MA_shp      = P->sLF_MA_shp;
+
+    for( i = 0; i < length; i++ ) {
+        if( lag > 0 ) {
+            silk_assert( HARM_SHAPE_FIR_TAPS == 3 );
+            idx = lag + LTP_shp_buf_idx;
+            n_LTP  = LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 - 1) & LTP_MASK ] * HarmShapeFIR[ 0 ];
+            n_LTP += LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2    ) & LTP_MASK ] * HarmShapeFIR[ 1 ];
+            n_LTP += LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 + 1) & LTP_MASK ] * HarmShapeFIR[ 2 ];
+        } else {
+            n_LTP = 0;
+        }
+
+        n_Tilt = sLF_AR_shp * Tilt;
+        n_LF   = sLF_AR_shp * LF_AR_shp + sLF_MA_shp * LF_MA_shp;
+
+        sLF_AR_shp = st_res[ i ] - n_Tilt;
+        sLF_MA_shp = sLF_AR_shp - n_LF;
+
+        LTP_shp_buf_idx = ( LTP_shp_buf_idx - 1 ) & LTP_MASK;
+        LTP_shp_buf[ LTP_shp_buf_idx ] = sLF_MA_shp;
+
+        xw[ i ] = sLF_MA_shp - n_LTP;
+    }
+    /* Copy temp variable back to state */
+    P->sLF_AR_shp       = sLF_AR_shp;
+    P->sLF_MA_shp       = sLF_MA_shp;
+    P->sLTP_shp_buf_idx = LTP_shp_buf_idx;
+}
diff --git a/drivers/opus/silk/float/process_gains_FLP.c b/drivers/opus/silk/float/process_gains_FLP.c
new file mode 100644
index 0000000000..e83d05552a
--- /dev/null
+++ b/drivers/opus/silk/float/process_gains_FLP.c
@@ -0,0 +1,103 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/* Processing of gains */
+void silk_process_gains_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    opus_int                        condCoding                          /* I    The type of conditional coding to use       */
+)
+{
+    silk_shape_state_FLP *psShapeSt = &psEnc->sShape;
+    opus_int     k;
+    opus_int32   pGains_Q16[ MAX_NB_SUBFR ];
+    silk_float   s, InvMaxSqrVal, gain, quant_offset;
+
+    /* Gain reduction when LTP coding gain is high */
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) );
+        for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+            psEncCtrl->Gains[ k ] *= s;
+        }
+    }
+
+    /* Limit the quantized signal */
+    InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length );
+
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        /* Soft limit on ratio residual energy and squared gains */
+        gain = psEncCtrl->Gains[ k ];
+        gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );
+        psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f );
+    }
+
+    /* Prepare gains for noise shaping quantization */
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f );
+    }
+
+    /* Save unquantized gains and gain Index */
+    silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
+    psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
+
+    /* Quantize gains */
+    silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
+            &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+    /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
+    for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+        psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f;
+    }
+
+    /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
+    if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+        if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) {
+            psEnc->sCmn.indices.quantOffsetType = 0;
+        } else {
+            psEnc->sCmn.indices.quantOffsetType = 1;
+        }
+    }
+
+    /* Quantizer boundary adjustment */
+    quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f;
+    psEncCtrl->Lambda = LAMBDA_OFFSET
+                      + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision
+                      + LAMBDA_SPEECH_ACT        * psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f )
+                      + LAMBDA_INPUT_QUALITY     * psEncCtrl->input_quality
+                      + LAMBDA_CODING_QUALITY    * psEncCtrl->coding_quality
+                      + LAMBDA_QUANT_OFFSET      * quant_offset;
+
+    silk_assert( psEncCtrl->Lambda > 0.0f );
+    silk_assert( psEncCtrl->Lambda < 2.0f );
+}
diff --git a/drivers/opus/silk/float/regularize_correlations_FLP.c b/drivers/opus/silk/float/regularize_correlations_FLP.c
new file mode 100644
index 0000000000..f056eadc57
--- /dev/null
+++ b/drivers/opus/silk/float/regularize_correlations_FLP.c
@@ -0,0 +1,48 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+/* Add noise to matrix diagonal */
+void silk_regularize_correlations_FLP(
+    silk_float                      *XX,                                /* I/O  Correlation matrices                        */
+    silk_float                      *xx,                                /* I/O  Correlation values                          */
+    const silk_float                noise,                              /* I    Noise energy to add                         */
+    const opus_int                  D                                   /* I    Dimension of XX                             */
+)
+{
+    opus_int i;
+
+    for( i = 0; i < D; i++ ) {
+        matrix_ptr( &XX[ 0 ], i, i, D ) += noise;
+    }
+    xx[ 0 ] += noise;
+}
diff --git a/drivers/opus/silk/float/residual_energy_FLP.c b/drivers/opus/silk/float/residual_energy_FLP.c
new file mode 100644
index 0000000000..011efcef04
--- /dev/null
+++ b/drivers/opus/silk/float/residual_energy_FLP.c
@@ -0,0 +1,117 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+#define MAX_ITERATIONS_RESIDUAL_NRG         10
+#define REGULARIZATION_FACTOR               1e-8f
+
+/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
+silk_float silk_residual_energy_covar_FLP(                              /* O    Weighted residual energy                    */
+    const silk_float                *c,                                 /* I    Filter coefficients                         */
+    silk_float                      *wXX,                               /* I/O  Weighted correlation matrix, reg. out       */
+    const silk_float                *wXx,                               /* I    Weighted correlation vector                 */
+    const silk_float                wxx,                                /* I    Weighted correlation value                  */
+    const opus_int                  D                                   /* I    Dimension                                   */
+)
+{
+    opus_int   i, j, k;
+    silk_float tmp, nrg = 0.0f, regularization;
+
+    /* Safety checks */
+    silk_assert( D >= 0 );
+
+    regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] );
+    for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) {
+        nrg = wxx;
+
+        tmp = 0.0f;
+        for( i = 0; i < D; i++ ) {
+            tmp += wXx[ i ] * c[ i ];
+        }
+        nrg -= 2.0f * tmp;
+
+        /* compute c' * wXX * c, assuming wXX is symmetric */
+        for( i = 0; i < D; i++ ) {
+            tmp = 0.0f;
+            for( j = i + 1; j < D; j++ ) {
+                tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ];
+            }
+            nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] );
+        }
+        if( nrg > 0 ) {
+            break;
+        } else {
+            /* Add white noise */
+            for( i = 0; i < D; i++ ) {
+                matrix_c_ptr( wXX, i, i, D ) +=  regularization;
+            }
+            /* Increase noise for next run */
+            regularization *= 2.0f;
+        }
+    }
+    if( k == MAX_ITERATIONS_RESIDUAL_NRG ) {
+        silk_assert( nrg == 0 );
+        nrg = 1.0f;
+    }
+
+    return nrg;
+}
+
+/* Calculates residual energies of input subframes where all subframes have LPC_order   */
+/* of preceding samples                                                                 */
+void silk_residual_energy_FLP(
+    silk_float                      nrgs[ MAX_NB_SUBFR ],               /* O    Residual energy per subframe                */
+    const silk_float                x[],                                /* I    Input signal                                */
+    silk_float                      a[ 2 ][ MAX_LPC_ORDER ],            /* I    AR coefs for each frame half                */
+    const silk_float                gains[],                            /* I    Quantization gains                          */
+    const opus_int                  subfr_length,                       /* I    Subframe length                             */
+    const opus_int                  nb_subfr,                           /* I    number of subframes                         */
+    const opus_int                  LPC_order                           /* I    LPC order                                   */
+)
+{
+    opus_int     shift;
+    silk_float   *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ];
+
+    LPC_res_ptr = LPC_res + LPC_order;
+    shift = LPC_order + subfr_length;
+
+    /* Filter input to create the LPC residual for each frame half, and measure subframe energies */
+    silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order );
+    nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) );
+    nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) );
+
+    if( nb_subfr == MAX_NB_SUBFR ) {
+        silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order );
+        nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) );
+        nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) );
+    }
+}
diff --git a/drivers/opus/silk/float/scale_copy_vector_FLP.c b/drivers/opus/silk/float/scale_copy_vector_FLP.c
new file mode 100644
index 0000000000..7578d44894
--- /dev/null
+++ b/drivers/opus/silk/float/scale_copy_vector_FLP.c
@@ -0,0 +1,57 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+/* copy and multiply a vector by a constant */
+void silk_scale_copy_vector_FLP(
+    silk_float          *data_out,
+    const silk_float    *data_in,
+    silk_float          gain,
+    opus_int            dataSize
+)
+{
+    opus_int  i, dataSize4;
+
+    /* 4x unrolled loop */
+    dataSize4 = dataSize & 0xFFFC;
+    for( i = 0; i < dataSize4; i += 4 ) {
+        data_out[ i + 0 ] = gain * data_in[ i + 0 ];
+        data_out[ i + 1 ] = gain * data_in[ i + 1 ];
+        data_out[ i + 2 ] = gain * data_in[ i + 2 ];
+        data_out[ i + 3 ] = gain * data_in[ i + 3 ];
+    }
+
+    /* any remaining elements */
+    for( ; i < dataSize; i++ ) {
+        data_out[ i ] = gain * data_in[ i ];
+    }
+}
diff --git a/drivers/opus/silk/float/scale_vector_FLP.c b/drivers/opus/silk/float/scale_vector_FLP.c
new file mode 100644
index 0000000000..03345d519d
--- /dev/null
+++ b/drivers/opus/silk/float/scale_vector_FLP.c
@@ -0,0 +1,56 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+/* multiply a vector by a constant */
+void silk_scale_vector_FLP(
+    silk_float          *data1,
+    silk_float          gain,
+    opus_int            dataSize
+)
+{
+    opus_int  i, dataSize4;
+
+    /* 4x unrolled loop */
+    dataSize4 = dataSize & 0xFFFC;
+    for( i = 0; i < dataSize4; i += 4 ) {
+        data1[ i + 0 ] *= gain;
+        data1[ i + 1 ] *= gain;
+        data1[ i + 2 ] *= gain;
+        data1[ i + 3 ] *= gain;
+    }
+
+    /* any remaining elements */
+    for( ; i < dataSize; i++ ) {
+        data1[ i ] *= gain;
+    }
+}
diff --git a/drivers/opus/silk/float/schur_FLP.c b/drivers/opus/silk/float/schur_FLP.c
new file mode 100644
index 0000000000..76b87f1304
--- /dev/null
+++ b/drivers/opus/silk/float/schur_FLP.c
@@ -0,0 +1,70 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FLP.h"
+
+silk_float silk_schur_FLP(                  /* O    returns residual energy                                     */
+    silk_float          refl_coef[],        /* O    reflection coefficients (length order)                      */
+    const silk_float    auto_corr[],        /* I    autocorrelation sequence (length order+1)                   */
+    opus_int            order               /* I    order                                                       */
+)
+{
+    opus_int   k, n;
+    silk_float C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ];
+    silk_float Ctmp1, Ctmp2, rc_tmp;
+
+    silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 );
+
+    /* Copy correlations */
+    for( k = 0; k < order+1; k++ ) {
+        C[ k ][ 0 ] = C[ k ][ 1 ] = auto_corr[ k ];
+    }
+
+    for( k = 0; k < order; k++ ) {
+        /* Get reflection coefficient */
+        rc_tmp = -C[ k + 1 ][ 0 ] / silk_max_float( C[ 0 ][ 1 ], 1e-9f );
+
+        /* Save the output */
+        refl_coef[ k ] = rc_tmp;
+
+        /* Update correlations */
+        for( n = 0; n < order - k; n++ ) {
+            Ctmp1 = C[ n + k + 1 ][ 0 ];
+            Ctmp2 = C[ n ][ 1 ];
+            C[ n + k + 1 ][ 0 ] = Ctmp1 + Ctmp2 * rc_tmp;
+            C[ n ][ 1 ]         = Ctmp2 + Ctmp1 * rc_tmp;
+        }
+    }
+
+    /* Return residual energy */
+    return C[ 0 ][ 1 ];
+}
+
diff --git a/drivers/opus/silk/float/solve_LS_FLP.c b/drivers/opus/silk/float/solve_LS_FLP.c
new file mode 100644
index 0000000000..9fd962b33d
--- /dev/null
+++ b/drivers/opus/silk/float/solve_LS_FLP.c
@@ -0,0 +1,207 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/**********************************************************************
+ * LDL Factorisation. Finds the upper triangular matrix L and the diagonal
+ * Matrix D (only the diagonal elements returned in a vector)such that
+ * the symmetric matric A is given by A = L*D*L'.
+ **********************************************************************/
+static OPUS_INLINE void silk_LDL_FLP(
+    silk_float          *A,         /* I/O  Pointer to Symetric Square Matrix                               */
+    opus_int            M,          /* I    Size of Matrix                                                  */
+    silk_float          *L,         /* I/O  Pointer to Square Upper triangular Matrix                       */
+    silk_float          *Dinv       /* I/O  Pointer to vector holding the inverse diagonal elements of D    */
+);
+
+/**********************************************************************
+ * Function to solve linear equation Ax = b, when A is a MxM lower
+ * triangular matrix, with ones on the diagonal.
+ **********************************************************************/
+static OPUS_INLINE void silk_SolveWithLowerTriangularWdiagOnes_FLP(
+    const silk_float    *L,         /* I    Pointer to Lower Triangular Matrix                              */
+    opus_int            M,          /* I    Dim of Matrix equation                                          */
+    const silk_float    *b,         /* I    b Vector                                                        */
+    silk_float          *x          /* O    x Vector                                                        */
+);
+
+/**********************************************************************
+ * Function to solve linear equation (A^T)x = b, when A is a MxM lower
+ * triangular, with ones on the diagonal. (ie then A^T is upper triangular)
+ **********************************************************************/
+static OPUS_INLINE void silk_SolveWithUpperTriangularFromLowerWdiagOnes_FLP(
+    const silk_float    *L,         /* I    Pointer to Lower Triangular Matrix                              */
+    opus_int            M,          /* I    Dim of Matrix equation                                          */
+    const silk_float    *b,         /* I    b Vector                                                        */
+    silk_float          *x          /* O    x Vector                                                        */
+);
+
+/**********************************************************************
+ * Function to solve linear equation Ax = b, when A is a MxM
+ * symmetric square matrix - using LDL factorisation
+ **********************************************************************/
+void silk_solve_LDL_FLP(
+    silk_float                      *A,                                 /* I/O  Symmetric square matrix, out: reg.          */
+    const opus_int                  M,                                  /* I    Size of matrix                              */
+    const silk_float                *b,                                 /* I    Pointer to b vector                         */
+    silk_float                      *x                                  /* O    Pointer to x solution vector                */
+)
+{
+    opus_int   i;
+    silk_float L[    MAX_MATRIX_SIZE ][ MAX_MATRIX_SIZE ];
+    silk_float T[    MAX_MATRIX_SIZE ];
+    silk_float Dinv[ MAX_MATRIX_SIZE ]; /* inverse diagonal elements of D*/
+
+    silk_assert( M <= MAX_MATRIX_SIZE );
+
+    /***************************************************
+    Factorize A by LDL such that A = L*D*(L^T),
+    where L is lower triangular with ones on diagonal
+    ****************************************************/
+    silk_LDL_FLP( A, M, &L[ 0 ][ 0 ], Dinv );
+
+    /****************************************************
+    * substitute D*(L^T) = T. ie:
+    L*D*(L^T)*x = b => L*T = b <=> T = inv(L)*b
+    ******************************************************/
+    silk_SolveWithLowerTriangularWdiagOnes_FLP( &L[ 0 ][ 0 ], M, b, T );
+
+    /****************************************************
+    D*(L^T)*x = T <=> (L^T)*x = inv(D)*T, because D is
+    diagonal just multiply with 1/d_i
+    ****************************************************/
+    for( i = 0; i < M; i++ ) {
+        T[ i ] = T[ i ] * Dinv[ i ];
+    }
+    /****************************************************
+    x = inv(L') * inv(D) * T
+    *****************************************************/
+    silk_SolveWithUpperTriangularFromLowerWdiagOnes_FLP( &L[ 0 ][ 0 ], M, T, x );
+}
+
+static OPUS_INLINE void silk_SolveWithUpperTriangularFromLowerWdiagOnes_FLP(
+    const silk_float    *L,         /* I    Pointer to Lower Triangular Matrix                              */
+    opus_int            M,          /* I    Dim of Matrix equation                                          */
+    const silk_float    *b,         /* I    b Vector                                                        */
+    silk_float          *x          /* O    x Vector                                                        */
+)
+{
+    opus_int   i, j;
+    silk_float temp;
+    const silk_float *ptr1;
+
+    for( i = M - 1; i >= 0; i-- ) {
+        ptr1 =  matrix_adr( L, 0, i, M );
+        temp = 0;
+        for( j = M - 1; j > i ; j-- ) {
+            temp += ptr1[ j * M ] * x[ j ];
+        }
+        temp = b[ i ] - temp;
+        x[ i ] = temp;
+    }
+}
+
+static OPUS_INLINE void silk_SolveWithLowerTriangularWdiagOnes_FLP(
+    const silk_float    *L,         /* I    Pointer to Lower Triangular Matrix                              */
+    opus_int            M,          /* I    Dim of Matrix equation                                          */
+    const silk_float    *b,         /* I    b Vector                                                        */
+    silk_float          *x          /* O    x Vector                                                        */
+)
+{
+    opus_int   i, j;
+    silk_float temp;
+    const silk_float *ptr1;
+
+    for( i = 0; i < M; i++ ) {
+        ptr1 =  matrix_adr( L, i, 0, M );
+        temp = 0;
+        for( j = 0; j < i; j++ ) {
+            temp += ptr1[ j ] * x[ j ];
+        }
+        temp = b[ i ] - temp;
+        x[ i ] = temp;
+    }
+}
+
+static OPUS_INLINE void silk_LDL_FLP(
+    silk_float          *A,         /* I/O  Pointer to Symetric Square Matrix                               */
+    opus_int            M,          /* I    Size of Matrix                                                  */
+    silk_float          *L,         /* I/O  Pointer to Square Upper triangular Matrix                       */
+    silk_float          *Dinv       /* I/O  Pointer to vector holding the inverse diagonal elements of D    */
+)
+{
+    opus_int i, j, k, loop_count, err = 1;
+    silk_float *ptr1, *ptr2;
+    double temp, diag_min_value;
+    silk_float v[ MAX_MATRIX_SIZE ], D[ MAX_MATRIX_SIZE ]; /* temp arrays*/
+
+    silk_assert( M <= MAX_MATRIX_SIZE );
+
+    diag_min_value = FIND_LTP_COND_FAC * 0.5f * ( A[ 0 ] + A[ M * M - 1 ] );
+    for( loop_count = 0; loop_count < M && err == 1; loop_count++ ) {
+        err = 0;
+        for( j = 0; j < M; j++ ) {
+            ptr1 = matrix_adr( L, j, 0, M );
+            temp = matrix_ptr( A, j, j, M ); /* element in row j column j*/
+            for( i = 0; i < j; i++ ) {
+                v[ i ] = ptr1[ i ] * D[ i ];
+                temp  -= ptr1[ i ] * v[ i ];
+            }
+            if( temp < diag_min_value ) {
+                /* Badly conditioned matrix: add white noise and run again */
+                temp = ( loop_count + 1 ) * diag_min_value - temp;
+                for( i = 0; i < M; i++ ) {
+                    matrix_ptr( A, i, i, M ) += ( silk_float )temp;
+                }
+                err = 1;
+                break;
+            }
+            D[ j ]    = ( silk_float )temp;
+            Dinv[ j ] = ( silk_float )( 1.0f / temp );
+            matrix_ptr( L, j, j, M ) = 1.0f;
+
+            ptr1 = matrix_adr( A, j, 0, M );
+            ptr2 = matrix_adr( L, j + 1, 0, M);
+            for( i = j + 1; i < M; i++ ) {
+                temp = 0.0;
+                for( k = 0; k < j; k++ ) {
+                    temp += ptr2[ k ] * v[ k ];
+                }
+                matrix_ptr( L, i, j, M ) = ( silk_float )( ( ptr1[ i ] - temp ) * Dinv[ j ] );
+                ptr2 += M; /* go to next column*/
+            }
+        }
+    }
+    silk_assert( err == 0 );
+}
+
diff --git a/drivers/opus/silk/float/sort_FLP.c b/drivers/opus/silk/float/sort_FLP.c
new file mode 100644
index 0000000000..58ea485116
--- /dev/null
+++ b/drivers/opus/silk/float/sort_FLP.c
@@ -0,0 +1,83 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/* Insertion sort (fast for already almost sorted arrays):  */
+/* Best case:  O(n)   for an already sorted array           */
+/* Worst case: O(n^2) for an inversely sorted array         */
+
+#include "typedef.h"
+#include "SigProc_FLP.h"
+
+void silk_insertion_sort_decreasing_FLP(
+    silk_float          *a,                 /* I/O  Unsorted / Sorted vector                                    */
+    opus_int            *idx,               /* O    Index vector for the sorted elements                        */
+    const opus_int      L,                  /* I    Vector length                                               */
+    const opus_int      K                   /* I    Number of correctly sorted positions                        */
+)
+{
+    silk_float value;
+    opus_int   i, j;
+
+    /* Safety checks */
+    silk_assert( K >  0 );
+    silk_assert( L >  0 );
+    silk_assert( L >= K );
+
+    /* Write start indices in index vector */
+    for( i = 0; i < K; i++ ) {
+        idx[ i ] = i;
+    }
+
+    /* Sort vector elements by value, decreasing order */
+    for( i = 1; i < K; i++ ) {
+        value = a[ i ];
+        for( j = i - 1; ( j >= 0 ) && ( value > a[ j ] ); j-- ) {
+            a[ j + 1 ]   = a[ j ];      /* Shift value */
+            idx[ j + 1 ] = idx[ j ];    /* Shift index */
+        }
+        a[ j + 1 ]   = value;   /* Write value */
+        idx[ j + 1 ] = i;       /* Write index */
+    }
+
+    /* If less than L values are asked check the remaining values,      */
+    /* but only spend CPU to ensure that the K first values are correct */
+    for( i = K; i < L; i++ ) {
+        value = a[ i ];
+        if( value > a[ K - 1 ] ) {
+            for( j = K - 2; ( j >= 0 ) && ( value > a[ j ] ); j-- ) {
+                a[ j + 1 ]   = a[ j ];      /* Shift value */
+                idx[ j + 1 ] = idx[ j ];    /* Shift index */
+            }
+            a[ j + 1 ]   = value;   /* Write value */
+            idx[ j + 1 ] = i;       /* Write index */
+        }
+    }
+}
diff --git a/drivers/opus/silk/float/structs_FLP.h b/drivers/opus/silk/float/structs_FLP.h
new file mode 100644
index 0000000000..4082914d93
--- /dev/null
+++ b/drivers/opus/silk/float/structs_FLP.h
@@ -0,0 +1,131 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_STRUCTS_FLP_H
+#define SILK_STRUCTS_FLP_H
+
+#include "typedef.h"
+#include "silk_main.h"
+#include "structs.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/********************************/
+/* Noise shaping analysis state */
+/********************************/
+typedef struct {
+    opus_int8                   LastGainIndex;
+    silk_float                  HarmBoost_smth;
+    silk_float                  HarmShapeGain_smth;
+    silk_float                  Tilt_smth;
+} silk_shape_state_FLP;
+
+/********************************/
+/* Prefilter state              */
+/********************************/
+typedef struct {
+    silk_float                  sLTP_shp[ LTP_BUF_LENGTH ];
+    silk_float                  sAR_shp[ MAX_SHAPE_LPC_ORDER + 1 ];
+    opus_int                    sLTP_shp_buf_idx;
+    silk_float                  sLF_AR_shp;
+    silk_float                  sLF_MA_shp;
+    silk_float                  sHarmHP;
+    opus_int32                  rand_seed;
+    opus_int                    lagPrev;
+} silk_prefilter_state_FLP;
+
+/********************************/
+/* Encoder state FLP            */
+/********************************/
+typedef struct {
+    silk_encoder_state          sCmn;                               /* Common struct, shared with fixed-point code */
+    silk_shape_state_FLP        sShape;                             /* Noise shaping state */
+    silk_prefilter_state_FLP    sPrefilt;                           /* Prefilter State */
+
+    /* Buffer for find pitch and noise shape analysis */
+    silk_float                  x_buf[ 2 * MAX_FRAME_LENGTH + LA_SHAPE_MAX ];/* Buffer for find pitch and noise shape analysis */
+    silk_float                  LTPCorr;                            /* Normalized correlation from pitch lag estimator */
+} silk_encoder_state_FLP;
+
+/************************/
+/* Encoder control FLP  */
+/************************/
+typedef struct {
+    /* Prediction and coding parameters */
+    silk_float                  Gains[ MAX_NB_SUBFR ];
+    silk_float                  PredCoef[ 2 ][ MAX_LPC_ORDER ];     /* holds interpolated and final coefficients */
+    silk_float                  LTPCoef[LTP_ORDER * MAX_NB_SUBFR];
+    silk_float                  LTP_scale;
+    opus_int                    pitchL[ MAX_NB_SUBFR ];
+
+    /* Noise shaping parameters */
+    silk_float                  AR1[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ];
+    silk_float                  AR2[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ];
+    silk_float                  LF_MA_shp[     MAX_NB_SUBFR ];
+    silk_float                  LF_AR_shp[     MAX_NB_SUBFR ];
+    silk_float                  GainsPre[      MAX_NB_SUBFR ];
+    silk_float                  HarmBoost[     MAX_NB_SUBFR ];
+    silk_float                  Tilt[          MAX_NB_SUBFR ];
+    silk_float                  HarmShapeGain[ MAX_NB_SUBFR ];
+    silk_float                  Lambda;
+    silk_float                  input_quality;
+    silk_float                  coding_quality;
+
+    /* Measures */
+    silk_float                  sparseness;
+    silk_float                  predGain;
+    silk_float                  LTPredCodGain;
+    silk_float                  ResNrg[ MAX_NB_SUBFR ];             /* Residual energy per subframe */
+
+    /* Parameters for CBR mode */
+    opus_int32                  GainsUnq_Q16[ MAX_NB_SUBFR ];
+    opus_int8                   lastGainIndexPrev;
+} silk_encoder_control_FLP;
+
+/************************/
+/* Encoder Super Struct */
+/************************/
+typedef struct {
+    silk_encoder_state_FLP      state_Fxx[ ENCODER_NUM_CHANNELS ];
+    stereo_enc_state            sStereo;
+    opus_int32                  nBitsExceeded;
+    opus_int                    nChannelsAPI;
+    opus_int                    nChannelsInternal;
+    opus_int                    nPrevChannelsInternal;
+    opus_int                    timeSinceSwitchAllowed_ms;
+    opus_int                    allowBandwidthSwitch;
+    opus_int                    prev_decode_only_middle;
+} silk_encoder;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/float/warped_autocorrelation_FLP.c b/drivers/opus/silk/float/warped_autocorrelation_FLP.c
new file mode 100644
index 0000000000..6075dfe8d3
--- /dev/null
+++ b/drivers/opus/silk/float/warped_autocorrelation_FLP.c
@@ -0,0 +1,73 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+/* Autocorrelations for a warped frequency axis */
+void silk_warped_autocorrelation_FLP(
+    silk_float                      *corr,                              /* O    Result [order + 1]                          */
+    const silk_float                *input,                             /* I    Input data to correlate                     */
+    const silk_float                warping,                            /* I    Warping coefficient                         */
+    const opus_int                  length,                             /* I    Length of input                             */
+    const opus_int                  order                               /* I    Correlation order (even)                    */
+)
+{
+    opus_int    n, i;
+    double      tmp1, tmp2;
+    double      state[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
+    double      C[     MAX_SHAPE_LPC_ORDER + 1 ] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
+
+    /* Order must be even */
+    silk_assert( ( order & 1 ) == 0 );
+
+    /* Loop over samples */
+    for( n = 0; n < length; n++ ) {
+        tmp1 = input[ n ];
+        /* Loop over allpass sections */
+        for( i = 0; i < order; i += 2 ) {
+            /* Output of allpass section */
+            tmp2 = state[ i ] + warping * ( state[ i + 1 ] - tmp1 );
+            state[ i ] = tmp1;
+            C[ i ] += state[ 0 ] * tmp1;
+            /* Output of allpass section */
+            tmp1 = state[ i + 1 ] + warping * ( state[ i + 2 ] - tmp2 );
+            state[ i + 1 ] = tmp2;
+            C[ i + 1 ] += state[ 0 ] * tmp2;
+        }
+        state[ order ] = tmp1;
+        C[ order ] += state[ 0 ] * tmp1;
+    }
+
+    /* Copy correlations in silk_float output format */
+    for( i = 0; i < order + 1; i++ ) {
+        corr[ i ] = ( silk_float )C[ i ];
+    }
+}
diff --git a/drivers/opus/silk/float/wrappers_FLP.c b/drivers/opus/silk/float/wrappers_FLP.c
new file mode 100644
index 0000000000..c4e34e5578
--- /dev/null
+++ b/drivers/opus/silk/float/wrappers_FLP.c
@@ -0,0 +1,201 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "main_FLP.h"
+
+/* Wrappers. Calls flp / fix code */
+
+/* Convert AR filter coefficients to NLSF parameters */
+void silk_A2NLSF_FLP(
+    opus_int16                      *NLSF_Q15,                          /* O    NLSF vector      [ LPC_order ]              */
+    const silk_float                *pAR,                               /* I    LPC coefficients [ LPC_order ]              */
+    const opus_int                  LPC_order                           /* I    LPC order                                   */
+)
+{
+    opus_int   i;
+    opus_int32 a_fix_Q16[ MAX_LPC_ORDER ];
+
+    for( i = 0; i < LPC_order; i++ ) {
+        a_fix_Q16[ i ] = silk_float2int( pAR[ i ] * 65536.0f );
+    }
+
+    silk_A2NLSF( NLSF_Q15, a_fix_Q16, LPC_order );
+}
+
+/* Convert LSF parameters to AR prediction filter coefficients */
+void silk_NLSF2A_FLP(
+    silk_float                      *pAR,                               /* O    LPC coefficients [ LPC_order ]              */
+    const opus_int16                *NLSF_Q15,                          /* I    NLSF vector      [ LPC_order ]              */
+    const opus_int                  LPC_order                           /* I    LPC order                                   */
+)
+{
+    opus_int   i;
+    opus_int16 a_fix_Q12[ MAX_LPC_ORDER ];
+
+    silk_NLSF2A( a_fix_Q12, NLSF_Q15, LPC_order );
+
+    for( i = 0; i < LPC_order; i++ ) {
+        pAR[ i ] = ( silk_float )a_fix_Q12[ i ] * ( 1.0f / 4096.0f );
+    }
+}
+
+/******************************************/
+/* Floating-point NLSF processing wrapper */
+/******************************************/
+void silk_process_NLSFs_FLP(
+    silk_encoder_state              *psEncC,                            /* I/O  Encoder state                               */
+    silk_float                      PredCoef[ 2 ][ MAX_LPC_ORDER ],     /* O    Prediction coefficients                     */
+    opus_int16                      NLSF_Q15[      MAX_LPC_ORDER ],     /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
+    const opus_int16                prev_NLSF_Q15[ MAX_LPC_ORDER ]      /* I    Previous Normalized LSFs (0 - (2^15-1))     */
+)
+{
+    opus_int     i, j;
+    opus_int16   PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ];
+
+    silk_process_NLSFs( psEncC, PredCoef_Q12, NLSF_Q15, prev_NLSF_Q15);
+
+    for( j = 0; j < 2; j++ ) {
+        for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
+            PredCoef[ j ][ i ] = ( silk_float )PredCoef_Q12[ j ][ i ] * ( 1.0f / 4096.0f );
+        }
+    }
+}
+
+/****************************************/
+/* Floating-point Silk NSQ wrapper      */
+/****************************************/
+void silk_NSQ_wrapper_FLP(
+    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
+    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
+    SideInfoIndices                 *psIndices,                         /* I/O  Quantization indices                        */
+    silk_nsq_state                  *psNSQ,                             /* I/O  Noise Shaping Quantzation state             */
+    opus_int8                       pulses[],                           /* O    Quantized pulse signal                      */
+    const silk_float                x[]                                 /* I    Prefiltered input signal                    */
+)
+{
+    opus_int     i, j;
+    opus_int32   x_Q3[ MAX_FRAME_LENGTH ];
+    opus_int32   Gains_Q16[ MAX_NB_SUBFR ];
+    silk_DWORD_ALIGN opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ];
+    opus_int16   LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ];
+    opus_int     LTP_scale_Q14;
+
+    /* Noise shaping parameters */
+    opus_int16   AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ];
+    opus_int32   LF_shp_Q14[ MAX_NB_SUBFR ];         /* Packs two int16 coefficients per int32 value             */
+    opus_int     Lambda_Q10;
+    opus_int     Tilt_Q14[ MAX_NB_SUBFR ];
+    opus_int     HarmShapeGain_Q14[ MAX_NB_SUBFR ];
+
+    /* Convert control struct to fix control struct */
+    /* Noise shape parameters */
+    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+        for( j = 0; j < psEnc->sCmn.shapingLPCOrder; j++ ) {
+            AR2_Q13[ i * MAX_SHAPE_LPC_ORDER + j ] = silk_float2int( psEncCtrl->AR2[ i * MAX_SHAPE_LPC_ORDER + j ] * 8192.0f );
+        }
+    }
+
+    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+        LF_shp_Q14[ i ] =   silk_LSHIFT32( silk_float2int( psEncCtrl->LF_AR_shp[ i ]     * 16384.0f ), 16 ) |
+                              (opus_uint16)silk_float2int( psEncCtrl->LF_MA_shp[ i ]     * 16384.0f );
+        Tilt_Q14[ i ]   =        (opus_int)silk_float2int( psEncCtrl->Tilt[ i ]          * 16384.0f );
+        HarmShapeGain_Q14[ i ] = (opus_int)silk_float2int( psEncCtrl->HarmShapeGain[ i ] * 16384.0f );
+    }
+    Lambda_Q10 = ( opus_int )silk_float2int( psEncCtrl->Lambda * 1024.0f );
+
+    /* prediction and coding parameters */
+    for( i = 0; i < psEnc->sCmn.nb_subfr * LTP_ORDER; i++ ) {
+        LTPCoef_Q14[ i ] = (opus_int16)silk_float2int( psEncCtrl->LTPCoef[ i ] * 16384.0f );
+    }
+
+    for( j = 0; j < 2; j++ ) {
+        for( i = 0; i < psEnc->sCmn.predictLPCOrder; i++ ) {
+            PredCoef_Q12[ j ][ i ] = (opus_int16)silk_float2int( psEncCtrl->PredCoef[ j ][ i ] * 4096.0f );
+        }
+    }
+
+    for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+        Gains_Q16[ i ] = silk_float2int( psEncCtrl->Gains[ i ] * 65536.0f );
+        silk_assert( Gains_Q16[ i ] > 0 );
+    }
+
+    if( psIndices->signalType == TYPE_VOICED ) {
+        LTP_scale_Q14 = silk_LTPScales_table_Q14[ psIndices->LTP_scaleIndex ];
+    } else {
+        LTP_scale_Q14 = 0;
+    }
+
+    /* Convert input to fix */
+    for( i = 0; i < psEnc->sCmn.frame_length; i++ ) {
+        x_Q3[ i ] = silk_float2int( 8.0f * x[ i ] );
+    }
+
+    /* Call NSQ */
+    if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
+        silk_NSQ_del_dec( &psEnc->sCmn, psNSQ, psIndices, x_Q3, pulses, PredCoef_Q12[ 0 ], LTPCoef_Q14,
+            AR2_Q13, HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16, psEncCtrl->pitchL, Lambda_Q10, LTP_scale_Q14 );
+    } else {
+        silk_NSQ( &psEnc->sCmn, psNSQ, psIndices, x_Q3, pulses, PredCoef_Q12[ 0 ], LTPCoef_Q14,
+            AR2_Q13, HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16, psEncCtrl->pitchL, Lambda_Q10, LTP_scale_Q14 );
+    }
+}
+
+/***********************************************/
+/* Floating-point Silk LTP quantiation wrapper */
+/***********************************************/
+void silk_quant_LTP_gains_FLP(
+    silk_float                      B[ MAX_NB_SUBFR * LTP_ORDER ],      /* I/O  (Un-)quantized LTP gains                    */
+    opus_int8                       cbk_index[ MAX_NB_SUBFR ],          /* O    Codebook index                              */
+    opus_int8                       *periodicity_index,                 /* O    Periodicity index                           */
+    opus_int32                      *sum_log_gain_Q7,                   /* I/O  Cumulative max prediction gain  */
+    const silk_float                W[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* I    Error weights                        */
+    const opus_int                  mu_Q10,                             /* I    Mu value (R/D tradeoff)                     */
+    const opus_int                  lowComplexity,                      /* I    Flag for low complexity                     */
+    const opus_int                  nb_subfr                            /* I    number of subframes                         */
+)
+{
+    opus_int   i;
+    opus_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ];
+    opus_int32 W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ];
+
+    for( i = 0; i < nb_subfr * LTP_ORDER; i++ ) {
+        B_Q14[ i ] = (opus_int16)silk_float2int( B[ i ] * 16384.0f );
+    }
+    for( i = 0; i < nb_subfr * LTP_ORDER * LTP_ORDER; i++ ) {
+        W_Q18[ i ] = (opus_int32)silk_float2int( W[ i ] * 262144.0f );
+    }
+
+    silk_quant_LTP_gains( B_Q14, cbk_index, periodicity_index, sum_log_gain_Q7, W_Q18, mu_Q10, lowComplexity, nb_subfr );
+
+    for( i = 0; i < nb_subfr * LTP_ORDER; i++ ) {
+        B[ i ] = (silk_float)B_Q14[ i ] * ( 1.0f / 16384.0f );
+    }
+}
diff --git a/drivers/opus/silk/gain_quant.c b/drivers/opus/silk/gain_quant.c
new file mode 100644
index 0000000000..e9467198eb
--- /dev/null
+++ b/drivers/opus/silk/gain_quant.c
@@ -0,0 +1,141 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+#define OFFSET                  ( ( MIN_QGAIN_DB * 128 ) / 6 + 16 * 128 )
+#define SCALE_Q16               ( ( 65536 * ( N_LEVELS_QGAIN - 1 ) ) / ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) )
+#define INV_SCALE_Q16           ( ( 65536 * ( ( ( MAX_QGAIN_DB - MIN_QGAIN_DB ) * 128 ) / 6 ) ) / ( N_LEVELS_QGAIN - 1 ) )
+
+/* Gain scalar quantization with hysteresis, uniform on log scale */
+void silk_gains_quant(
+    opus_int8                   ind[ MAX_NB_SUBFR ],            /* O    gain indices                                */
+    opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* I/O  gains (quantized out)                       */
+    opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
+    const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
+    const opus_int              nb_subfr                        /* I    number of subframes                         */
+)
+{
+    opus_int k, double_step_size_threshold;
+
+    for( k = 0; k < nb_subfr; k++ ) {
+        /* Convert to log scale, scale, floor() */
+        ind[ k ] = silk_SMULWB( SCALE_Q16, silk_lin2log( gain_Q16[ k ] ) - OFFSET );
+
+        /* Round towards previous quantized gain (hysteresis) */
+        if( ind[ k ] < *prev_ind ) {
+            ind[ k ]++;
+        }
+        ind[ k ] = silk_LIMIT_int( ind[ k ], 0, N_LEVELS_QGAIN - 1 );
+
+        /* Compute delta indices and limit */
+        if( k == 0 && conditional == 0 ) {
+            /* Full index */
+            ind[ k ] = silk_LIMIT_int( ind[ k ], *prev_ind + MIN_DELTA_GAIN_QUANT, N_LEVELS_QGAIN - 1 );
+            *prev_ind = ind[ k ];
+        } else {
+            /* Delta index */
+            ind[ k ] = ind[ k ] - *prev_ind;
+
+            /* Double the quantization step size for large gain increases, so that the max gain level can be reached */
+            double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind;
+            if( ind[ k ] > double_step_size_threshold ) {
+                ind[ k ] = double_step_size_threshold + silk_RSHIFT( ind[ k ] - double_step_size_threshold + 1, 1 );
+            }
+
+            ind[ k ] = silk_LIMIT_int( ind[ k ], MIN_DELTA_GAIN_QUANT, MAX_DELTA_GAIN_QUANT );
+
+            /* Accumulate deltas */
+            if( ind[ k ] > double_step_size_threshold ) {
+                *prev_ind += silk_LSHIFT( ind[ k ], 1 ) - double_step_size_threshold;
+            } else {
+                *prev_ind += ind[ k ];
+            }
+
+            /* Shift to make non-negative */
+            ind[ k ] -= MIN_DELTA_GAIN_QUANT;
+        }
+
+        /* Scale and convert to linear scale */
+        gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) ); /* 3967 = 31 in Q7 */
+    }
+}
+
+/* Gains scalar dequantization, uniform on log scale */
+void silk_gains_dequant(
+    opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* O    quantized gains                             */
+    const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
+    opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
+    const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
+    const opus_int              nb_subfr                        /* I    number of subframes                          */
+)
+{
+    opus_int   k, ind_tmp, double_step_size_threshold;
+
+    for( k = 0; k < nb_subfr; k++ ) {
+        if( k == 0 && conditional == 0 ) {
+            /* Gain index is not allowed to go down more than 16 steps (~21.8 dB) */
+            *prev_ind = silk_max_int( ind[ k ], *prev_ind - 16 );
+        } else {
+            /* Delta index */
+            ind_tmp = ind[ k ] + MIN_DELTA_GAIN_QUANT;
+
+            /* Accumulate deltas */
+            double_step_size_threshold = 2 * MAX_DELTA_GAIN_QUANT - N_LEVELS_QGAIN + *prev_ind;
+            if( ind_tmp > double_step_size_threshold ) {
+                *prev_ind += silk_LSHIFT( ind_tmp, 1 ) - double_step_size_threshold;
+            } else {
+                *prev_ind += ind_tmp;
+            }
+        }
+        *prev_ind = silk_LIMIT_int( *prev_ind, 0, N_LEVELS_QGAIN - 1 );
+
+        /* Scale and convert to linear scale */
+        gain_Q16[ k ] = silk_log2lin( silk_min_32( silk_SMULWB( INV_SCALE_Q16, *prev_ind ) + OFFSET, 3967 ) ); /* 3967 = 31 in Q7 */
+    }
+}
+
+/* Compute unique identifier of gain indices vector */
+opus_int32 silk_gains_ID(                                       /* O    returns unique identifier of gains          */
+    const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
+    const opus_int              nb_subfr                        /* I    number of subframes                         */
+)
+{
+    opus_int   k;
+    opus_int32 gainsID;
+
+    gainsID = 0;
+    for( k = 0; k < nb_subfr; k++ ) {
+        gainsID = silk_ADD_LSHIFT32( ind[ k ], gainsID, 8 );
+    }
+
+    return gainsID;
+}
diff --git a/drivers/opus/silk/init_decoder.c b/drivers/opus/silk/init_decoder.c
new file mode 100644
index 0000000000..88c1ff7b43
--- /dev/null
+++ b/drivers/opus/silk/init_decoder.c
@@ -0,0 +1,56 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/************************/
+/* Init Decoder State   */
+/************************/
+opus_int silk_init_decoder(
+    silk_decoder_state          *psDec                          /* I/O  Decoder state pointer                       */
+)
+{
+    /* Clear the entire encoder state, except anything copied */
+    silk_memset( psDec, 0, sizeof( silk_decoder_state ) );
+
+    /* Used to deactivate LSF interpolation */
+    psDec->first_frame_after_reset = 1;
+    psDec->prev_gain_Q16 = 65536;
+
+    /* Reset CNG state */
+    silk_CNG_Reset( psDec );
+
+    /* Reset PLC state */
+    silk_PLC_Reset( psDec );
+
+    return(0);
+}
+
diff --git a/drivers/opus/silk/init_encoder.c b/drivers/opus/silk/init_encoder.c
new file mode 100644
index 0000000000..baf97d49e7
--- /dev/null
+++ b/drivers/opus/silk/init_encoder.c
@@ -0,0 +1,64 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+#ifdef OPUS_FIXED_POINT
+#include "main_FIX.h"
+#else
+#include "main_FLP.h"
+#endif
+#include "tuning_parameters.h"
+#include "cpu_support.h"
+
+/*********************************/
+/* Initialize Silk Encoder state */
+/*********************************/
+opus_int silk_init_encoder(
+    silk_encoder_state_Fxx          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
+    int                              arch                                   /* I    Run-time architecture                                                       */
+)
+{
+    opus_int ret = 0;
+
+    /* Clear the entire encoder state */
+    silk_memset( psEnc, 0, sizeof( silk_encoder_state_Fxx ) );
+
+    psEnc->sCmn.arch = arch;
+
+    psEnc->sCmn.variable_HP_smth1_Q15 = silk_LSHIFT( silk_lin2log( SILK_FIX_CONST( VARIABLE_HP_MIN_CUTOFF_HZ, 16 ) ) - ( 16 << 7 ), 8 );
+    psEnc->sCmn.variable_HP_smth2_Q15 = psEnc->sCmn.variable_HP_smth1_Q15;
+
+    /* Used to deactivate LSF interpolation, pitch prediction */
+    psEnc->sCmn.first_frame_after_reset = 1;
+
+    /* Initialize Silk VAD */
+    ret += silk_VAD_Init( &psEnc->sCmn.sVAD );
+
+    return  ret;
+}
diff --git a/drivers/opus/silk/inner_prod_aligned.c b/drivers/opus/silk/inner_prod_aligned.c
new file mode 100644
index 0000000000..d625001db7
--- /dev/null
+++ b/drivers/opus/silk/inner_prod_aligned.c
@@ -0,0 +1,47 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+opus_int32 silk_inner_prod_aligned_scale(
+    const opus_int16 *const     inVec1,             /*    I input vector 1                                              */
+    const opus_int16 *const     inVec2,             /*    I input vector 2                                              */
+    const opus_int              scale,              /*    I number of bits to shift                                     */
+    const opus_int              len                 /*    I vector lengths                                              */
+)
+{
+    opus_int   i;
+    opus_int32 sum = 0;
+    for( i = 0; i < len; i++ ) {
+        sum = silk_ADD_RSHIFT32( sum, silk_SMULBB( inVec1[ i ], inVec2[ i ] ), scale );
+    }
+    return sum;
+}
diff --git a/drivers/opus/silk/interpolate.c b/drivers/opus/silk/interpolate.c
new file mode 100644
index 0000000000..d5df0feddb
--- /dev/null
+++ b/drivers/opus/silk/interpolate.c
@@ -0,0 +1,51 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Interpolate two vectors */
+void silk_interpolate(
+    opus_int16                  xi[ MAX_LPC_ORDER ],            /* O    interpolated vector                         */
+    const opus_int16            x0[ MAX_LPC_ORDER ],            /* I    first vector                                */
+    const opus_int16            x1[ MAX_LPC_ORDER ],            /* I    second vector                               */
+    const opus_int              ifact_Q2,                       /* I    interp. factor, weight on 2nd vector        */
+    const opus_int              d                               /* I    number of parameters                        */
+)
+{
+    opus_int i;
+
+    silk_assert( ifact_Q2 >= 0 );
+    silk_assert( ifact_Q2 <= 4 );
+
+    for( i = 0; i < d; i++ ) {
+        xi[ i ] = (opus_int16)silk_ADD_RSHIFT( x0[ i ], silk_SMULBB( x1[ i ] - x0[ i ], ifact_Q2 ), 2 );
+    }
+}
diff --git a/drivers/opus/silk/lin2log.c b/drivers/opus/silk/lin2log.c
new file mode 100644
index 0000000000..77bfc8c8ab
--- /dev/null
+++ b/drivers/opus/silk/lin2log.c
@@ -0,0 +1,46 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+/* Approximation of 128 * log2() (very close inverse of silk_log2lin()) */
+/* Convert input to a log scale    */
+opus_int32 silk_lin2log(
+    const opus_int32            inLin               /* I  input in linear scale                                         */
+)
+{
+    opus_int32 lz, frac_Q7;
+
+    silk_CLZ_FRAC( inLin, &lz, &frac_Q7 );
+
+    /* Piece-wise parabolic approximation */
+    return silk_LSHIFT( 31 - lz, 7 ) + silk_SMLAWB( frac_Q7, silk_MUL( frac_Q7, 128 - frac_Q7 ), 179 );
+}
+
diff --git a/drivers/opus/silk/log2lin.c b/drivers/opus/silk/log2lin.c
new file mode 100644
index 0000000000..0ed2a12efd
--- /dev/null
+++ b/drivers/opus/silk/log2lin.c
@@ -0,0 +1,58 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Approximation of 2^() (very close inverse of silk_lin2log()) */
+/* Convert input to a linear scale    */
+opus_int32 silk_log2lin( 
+    const opus_int32            inLog_Q7            /* I  input on log scale                                            */
+)
+{
+    opus_int32 out, frac_Q7;
+
+    if( inLog_Q7 < 0 ) {
+        return 0;
+    } else if ( inLog_Q7 >= 3967 ) {
+		return silk_int32_MAX;
+	}
+
+    out = silk_LSHIFT( 1, silk_RSHIFT( inLog_Q7, 7 ) );
+    frac_Q7 = inLog_Q7 & 0x7F;
+    if( inLog_Q7 < 2048 ) {
+        /* Piece-wise parabolic approximation */
+        out = silk_ADD_RSHIFT32( out, silk_MUL( out, silk_SMLAWB( frac_Q7, silk_SMULBB( frac_Q7, 128 - frac_Q7 ), -174 ) ), 7 );
+    } else {
+        /* Piece-wise parabolic approximation */
+        out = silk_MLA( out, silk_RSHIFT( out, 7 ), silk_SMLAWB( frac_Q7, silk_SMULBB( frac_Q7, 128 - frac_Q7 ), -174 ) );
+    }
+    return out;
+}
diff --git a/drivers/opus/silk/macros.h b/drivers/opus/silk/macros.h
new file mode 100644
index 0000000000..6cf2e93dbc
--- /dev/null
+++ b/drivers/opus/silk/macros.h
@@ -0,0 +1,113 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MACROS_H
+#define SILK_MACROS_H
+
+#include "opus_config.h"
+
+#include "opus_types.h"
+#include "opus_defines.h"
+
+/* This is an OPUS_INLINE header file for general platform. */
+
+/* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
+#define silk_SMULWB(a32, b32)            ((((a32) >> 16) * (opus_int32)((opus_int16)(b32))) + ((((a32) & 0x0000FFFF) * (opus_int32)((opus_int16)(b32))) >> 16))
+
+/* a32 + (b32 * (opus_int32)((opus_int16)(c32))) >> 16 output have to be 32bit int */
+#define silk_SMLAWB(a32, b32, c32)       ((a32) + ((((b32) >> 16) * (opus_int32)((opus_int16)(c32))) + ((((b32) & 0x0000FFFF) * (opus_int32)((opus_int16)(c32))) >> 16)))
+
+/* (a32 * (b32 >> 16)) >> 16 */
+#define silk_SMULWT(a32, b32)            (((a32) >> 16) * ((b32) >> 16) + ((((a32) & 0x0000FFFF) * ((b32) >> 16)) >> 16))
+
+/* a32 + (b32 * (c32 >> 16)) >> 16 */
+#define silk_SMLAWT(a32, b32, c32)       ((a32) + (((b32) >> 16) * ((c32) >> 16)) + ((((b32) & 0x0000FFFF) * ((c32) >> 16)) >> 16))
+
+/* (opus_int32)((opus_int16)(a3))) * (opus_int32)((opus_int16)(b32)) output have to be 32bit int */
+#define silk_SMULBB(a32, b32)            ((opus_int32)((opus_int16)(a32)) * (opus_int32)((opus_int16)(b32)))
+
+/* a32 + (opus_int32)((opus_int16)(b32)) * (opus_int32)((opus_int16)(c32)) output have to be 32bit int */
+#define silk_SMLABB(a32, b32, c32)       ((a32) + ((opus_int32)((opus_int16)(b32))) * (opus_int32)((opus_int16)(c32)))
+
+/* (opus_int32)((opus_int16)(a32)) * (b32 >> 16) */
+#define silk_SMULBT(a32, b32)            ((opus_int32)((opus_int16)(a32)) * ((b32) >> 16))
+
+/* a32 + (opus_int32)((opus_int16)(b32)) * (c32 >> 16) */
+#define silk_SMLABT(a32, b32, c32)       ((a32) + ((opus_int32)((opus_int16)(b32))) * ((c32) >> 16))
+
+/* a64 + (b32 * c32) */
+#define silk_SMLAL(a64, b32, c32)        (silk_ADD64((a64), ((opus_int64)(b32) * (opus_int64)(c32))))
+
+/* (a32 * b32) >> 16 */
+#define silk_SMULWW(a32, b32)            silk_MLA(silk_SMULWB((a32), (b32)), (a32), silk_RSHIFT_ROUND((b32), 16))
+
+/* a32 + ((b32 * c32) >> 16) */
+#define silk_SMLAWW(a32, b32, c32)       silk_MLA(silk_SMLAWB((a32), (b32), (c32)), (b32), silk_RSHIFT_ROUND((c32), 16))
+
+/* add/subtract with output saturated */
+#define silk_ADD_SAT32(a, b)             ((((opus_uint32)(a) + (opus_uint32)(b)) & 0x80000000) == 0 ?                              \
+                                        ((((a) & (b)) & 0x80000000) != 0 ? silk_int32_MIN : (a)+(b)) :   \
+                                        ((((a) | (b)) & 0x80000000) == 0 ? silk_int32_MAX : (a)+(b)) )
+
+#define silk_SUB_SAT32(a, b)             ((((opus_uint32)(a)-(opus_uint32)(b)) & 0x80000000) == 0 ?                                        \
+                                        (( (a) & ((b)^0x80000000) & 0x80000000) ? silk_int32_MIN : (a)-(b)) :    \
+                                        ((((a)^0x80000000) & (b)  & 0x80000000) ? silk_int32_MAX : (a)-(b)) )
+
+#include "ecintrin.h"
+
+static OPUS_INLINE opus_int32 silk_CLZ16(opus_int16 in16)
+{
+    return 32 - EC_ILOG(in16<<16|0x8000);
+}
+
+static OPUS_INLINE opus_int32 silk_CLZ32(opus_int32 in32)
+{
+    return in32 ? 32 - EC_ILOG(in32) : 32;
+}
+
+/* Row based */
+#define matrix_ptr(Matrix_base_adr, row, column, N) \
+    (*((Matrix_base_adr) + ((row)*(N)+(column))))
+#define matrix_adr(Matrix_base_adr, row, column, N) \
+      ((Matrix_base_adr) + ((row)*(N)+(column)))
+
+/* Column based */
+#ifndef matrix_c_ptr
+#   define matrix_c_ptr(Matrix_base_adr, row, column, M) \
+    (*((Matrix_base_adr) + ((row)+(M)*(column))))
+#endif
+
+#ifdef OPUS_ARM_INLINE_ASM
+#include "arm/macros_armv4.h"
+#endif
+
+#ifdef OPUS_ARM_INLINE_EDSP
+#include "arm/macros_armv5e.h"
+#endif
+
+#endif /* SILK_MACROS_H */
+
diff --git a/drivers/opus/silk/pitch_est_defines.h b/drivers/opus/silk/pitch_est_defines.h
new file mode 100644
index 0000000000..e1e4b5d768
--- /dev/null
+++ b/drivers/opus/silk/pitch_est_defines.h
@@ -0,0 +1,88 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_PE_DEFINES_H
+#define SILK_PE_DEFINES_H
+
+#include "SigProc_FIX.h"
+
+/********************************************************/
+/* Definitions for pitch estimator                      */
+/********************************************************/
+
+#define PE_MAX_FS_KHZ               16 /* Maximum sampling frequency used */
+
+#define PE_MAX_NB_SUBFR             4
+#define PE_SUBFR_LENGTH_MS          5   /* 5 ms */
+
+#define PE_LTP_MEM_LENGTH_MS        ( 4 * PE_SUBFR_LENGTH_MS )
+
+#define PE_MAX_FRAME_LENGTH_MS      ( PE_LTP_MEM_LENGTH_MS + PE_MAX_NB_SUBFR * PE_SUBFR_LENGTH_MS )
+#define PE_MAX_FRAME_LENGTH         ( PE_MAX_FRAME_LENGTH_MS * PE_MAX_FS_KHZ )
+#define PE_MAX_FRAME_LENGTH_ST_1    ( PE_MAX_FRAME_LENGTH >> 2 )
+#define PE_MAX_FRAME_LENGTH_ST_2    ( PE_MAX_FRAME_LENGTH >> 1 )
+
+#define PE_MAX_LAG_MS               18           /* 18 ms -> 56 Hz */
+#define PE_MIN_LAG_MS               2            /* 2 ms -> 500 Hz */
+#define PE_MAX_LAG                  ( PE_MAX_LAG_MS * PE_MAX_FS_KHZ )
+#define PE_MIN_LAG                  ( PE_MIN_LAG_MS * PE_MAX_FS_KHZ )
+
+#define PE_D_SRCH_LENGTH            24
+
+#define PE_NB_STAGE3_LAGS           5
+
+#define PE_NB_CBKS_STAGE2           3
+#define PE_NB_CBKS_STAGE2_EXT       11
+
+#define PE_NB_CBKS_STAGE3_MAX       34
+#define PE_NB_CBKS_STAGE3_MID       24
+#define PE_NB_CBKS_STAGE3_MIN       16
+
+#define PE_NB_CBKS_STAGE3_10MS      12
+#define PE_NB_CBKS_STAGE2_10MS      3
+
+#define PE_SHORTLAG_BIAS            0.2f    /* for logarithmic weighting    */
+#define PE_PREVLAG_BIAS             0.2f    /* for logarithmic weighting    */
+#define PE_FLATCONTOUR_BIAS         0.05f
+
+#define SILK_PE_MIN_COMPLEX         0
+#define SILK_PE_MID_COMPLEX         1
+#define SILK_PE_MAX_COMPLEX         2
+
+/* Tables for 20 ms frames */
+extern const opus_int8 silk_CB_lags_stage2[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE2_EXT ];
+extern const opus_int8 silk_CB_lags_stage3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ];
+extern const opus_int8 silk_Lag_range_stage3[ SILK_PE_MAX_COMPLEX + 1 ] [ PE_MAX_NB_SUBFR ][ 2 ];
+extern const opus_int8 silk_nb_cbk_searchs_stage3[ SILK_PE_MAX_COMPLEX + 1 ];
+
+/* Tables for 10 ms frames */
+extern const opus_int8 silk_CB_lags_stage2_10_ms[ PE_MAX_NB_SUBFR >> 1][ 3 ];
+extern const opus_int8 silk_CB_lags_stage3_10_ms[ PE_MAX_NB_SUBFR >> 1 ][ 12 ];
+extern const opus_int8 silk_Lag_range_stage3_10_ms[ PE_MAX_NB_SUBFR >> 1 ][ 2 ];
+
+#endif
+
diff --git a/drivers/opus/silk/pitch_est_tables.c b/drivers/opus/silk/pitch_est_tables.c
new file mode 100644
index 0000000000..97ddbab010
--- /dev/null
+++ b/drivers/opus/silk/pitch_est_tables.c
@@ -0,0 +1,99 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "typedef.h"
+#include "pitch_est_defines.h"
+
+const opus_int8 silk_CB_lags_stage2_10_ms[ PE_MAX_NB_SUBFR >> 1][ PE_NB_CBKS_STAGE2_10MS ] =
+{
+    {0, 1, 0},
+    {0, 0, 1}
+};
+
+const opus_int8 silk_CB_lags_stage3_10_ms[ PE_MAX_NB_SUBFR >> 1 ][ PE_NB_CBKS_STAGE3_10MS ] =
+{
+    { 0, 0, 1,-1, 1,-1, 2,-2, 2,-2, 3,-3},
+    { 0, 1, 0, 1,-1, 2,-1, 2,-2, 3,-2, 3}
+};
+
+const opus_int8 silk_Lag_range_stage3_10_ms[ PE_MAX_NB_SUBFR >> 1 ][ 2 ] =
+{
+    {-3, 7},
+    {-2, 7}
+};
+
+const opus_int8 silk_CB_lags_stage2[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE2_EXT ] =
+{
+    {0, 2,-1,-1,-1, 0, 0, 1, 1, 0, 1},
+    {0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0},
+    {0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0},
+    {0,-1, 2, 1, 0, 1, 1, 0, 0,-1,-1}
+};
+
+const opus_int8 silk_CB_lags_stage3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ] =
+{
+    {0, 0, 1,-1, 0, 1,-1, 0,-1, 1,-2, 2,-2,-2, 2,-3, 2, 3,-3,-4, 3,-4, 4, 4,-5, 5,-6,-5, 6,-7, 6, 5, 8,-9},
+    {0, 0, 1, 0, 0, 0, 0, 0, 0, 0,-1, 1, 0, 0, 1,-1, 0, 1,-1,-1, 1,-1, 2, 1,-1, 2,-2,-2, 2,-2, 2, 2, 3,-3},
+    {0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1,-1, 1, 0, 0, 2, 1,-1, 2,-1,-1, 2,-1, 2, 2,-1, 3,-2,-2,-2, 3},
+    {0, 1, 0, 0, 1, 0, 1,-1, 2,-1, 2,-1, 2, 3,-2, 3,-2,-2, 4, 4,-3, 5,-3,-4, 6,-4, 6, 5,-5, 8,-6,-5,-7, 9}
+};
+
+const opus_int8 silk_Lag_range_stage3[ SILK_PE_MAX_COMPLEX + 1 ] [ PE_MAX_NB_SUBFR ][ 2 ] =
+{
+    /* Lags to search for low number of stage3 cbks */
+    {
+        {-5,8},
+        {-1,6},
+        {-1,6},
+        {-4,10}
+    },
+    /* Lags to search for middle number of stage3 cbks */
+    {
+        {-6,10},
+        {-2,6},
+        {-1,6},
+        {-5,10}
+    },
+    /* Lags to search for max number of stage3 cbks */
+    {
+        {-9,12},
+        {-3,7},
+        {-2,7},
+        {-7,13}
+    }
+};
+
+const opus_int8 silk_nb_cbk_searchs_stage3[ SILK_PE_MAX_COMPLEX + 1 ] =
+{
+    PE_NB_CBKS_STAGE3_MIN,
+    PE_NB_CBKS_STAGE3_MID,
+    PE_NB_CBKS_STAGE3_MAX
+};
diff --git a/drivers/opus/silk/process_NLSFs.c b/drivers/opus/silk/process_NLSFs.c
new file mode 100644
index 0000000000..0193fda1f1
--- /dev/null
+++ b/drivers/opus/silk/process_NLSFs.c
@@ -0,0 +1,105 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Limit, stabilize, convert and quantize NLSFs */
+void silk_process_NLSFs(
+    silk_encoder_state          *psEncC,                            /* I/O  Encoder state                               */
+    opus_int16                  PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O    Prediction coefficients                     */
+    opus_int16                  pNLSF_Q15[         MAX_LPC_ORDER ], /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
+    const opus_int16            prev_NLSFq_Q15[    MAX_LPC_ORDER ]  /* I    Previous Normalized LSFs (0 - (2^15-1))     */
+)
+{
+    opus_int     i, doInterpolate;
+    opus_int     NLSF_mu_Q20;
+    opus_int32   i_sqr_Q15;
+    opus_int16   pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
+    opus_int16   pNLSFW_QW[ MAX_LPC_ORDER ];
+    opus_int16   pNLSFW0_temp_QW[ MAX_LPC_ORDER ];
+
+    silk_assert( psEncC->speech_activity_Q8 >=   0 );
+    silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) );
+    silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) );
+
+    /***********************/
+    /* Calculate mu values */
+    /***********************/
+    /* NLSF_mu  = 0.003 - 0.0015 * psEnc->speech_activity; */
+    NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 );
+    if( psEncC->nb_subfr == 2 ) {
+        /* Multiply by 1.5 for 10 ms packets */
+        NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 );
+    }
+
+    silk_assert( NLSF_mu_Q20 >  0 );
+    silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) );
+
+    /* Calculate NLSF weights */
+    silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder );
+
+    /* Update NLSF weights for interpolated NLSFs */
+    doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 );
+    if( doInterpolate ) {
+        /* Calculate the interpolated NLSF vector for the first half */
+        silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
+            psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
+
+        /* Calculate first half NLSF weights for the interpolated NLSFs */
+        silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder );
+
+        /* Update NLSF weights with contribution from first half */
+        i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 );
+        for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
+            pNLSFW_QW[ i ] = silk_SMLAWB( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), (opus_int32)pNLSFW0_temp_QW[ i ], i_sqr_Q15 );
+            silk_assert( pNLSFW_QW[ i ] >= 1 );
+        }
+    }
+
+    silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW,
+        NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType );
+
+    /* Convert quantized NLSFs back to LPC coefficients */
+    silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder );
+
+    if( doInterpolate ) {
+        /* Calculate the interpolated, quantized LSF vector for the first half */
+        silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
+            psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
+
+        /* Convert back to LPC coefficients */
+        silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder );
+
+    } else {
+        /* Copy LPC coefficients for first half from second half */
+        silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) );
+    }
+}
diff --git a/drivers/opus/silk/quant_LTP_gains.c b/drivers/opus/silk/quant_LTP_gains.c
new file mode 100644
index 0000000000..34bcd3acdb
--- /dev/null
+++ b/drivers/opus/silk/quant_LTP_gains.c
@@ -0,0 +1,128 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "tuning_parameters.h"
+
+void silk_quant_LTP_gains(
+    opus_int16                  B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],          /* I/O  (un)quantized LTP gains         */
+    opus_int8                   cbk_index[ MAX_NB_SUBFR ],                  /* O    Codebook Index                  */
+    opus_int8                   *periodicity_index,                         /* O    Periodicity Index               */
+	opus_int32					*sum_log_gain_Q7,							/* I/O  Cumulative max prediction gain  */
+    const opus_int32            W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ],  /* I    Error Weights in Q18            */
+    opus_int                    mu_Q9,                                      /* I    Mu value (R/D tradeoff)         */
+    opus_int                    lowComplexity,                              /* I    Flag for low complexity         */
+    const opus_int              nb_subfr                                    /* I    number of subframes             */
+)
+{
+    opus_int             j, k, cbk_size;
+    opus_int8            temp_idx[ MAX_NB_SUBFR ];
+    const opus_uint8     *cl_ptr_Q5;
+    const opus_int8      *cbk_ptr_Q7;
+    const opus_uint8     *cbk_gain_ptr_Q7;
+    const opus_int16     *b_Q14_ptr;
+    const opus_int32     *W_Q18_ptr;
+    opus_int32           rate_dist_Q14_subfr, rate_dist_Q14, min_rate_dist_Q14;
+	opus_int32           sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7, gain_Q7;
+
+    /***************************************************/
+    /* iterate over different codebooks with different */
+    /* rates/distortions, and choose best */
+    /***************************************************/
+    min_rate_dist_Q14 = silk_int32_MAX;
+    best_sum_log_gain_Q7 = 0;
+    for( k = 0; k < 3; k++ ) {
+        /* Safety margin for pitch gain control, to take into account factors
+           such as state rescaling/rewhitening. */
+        opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 );
+
+        cl_ptr_Q5  = silk_LTP_gain_BITS_Q5_ptrs[ k ];
+        cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[        k ];
+        cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ];
+        cbk_size   = silk_LTP_vq_sizes[          k ];
+
+        /* Set up pointer to first subframe */
+        W_Q18_ptr = W_Q18;
+        b_Q14_ptr = B_Q14;
+
+        rate_dist_Q14 = 0;
+		sum_log_gain_tmp_Q7 = *sum_log_gain_Q7;
+        for( j = 0; j < nb_subfr; j++ ) {
+			max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 ) 
+										+ SILK_FIX_CONST( 7, 7 ) ) - gain_safety;
+
+            silk_VQ_WMat_EC(
+                &temp_idx[ j ],         /* O    index of best codebook vector                           */
+                &rate_dist_Q14_subfr,   /* O    best weighted quantization error + mu * rate            */
+				&gain_Q7,               /* O    sum of absolute LTP coefficients                        */
+                b_Q14_ptr,              /* I    input vector to be quantized                            */
+                W_Q18_ptr,              /* I    weighting matrix                                        */
+                cbk_ptr_Q7,             /* I    codebook                                                */
+                cbk_gain_ptr_Q7,        /* I    codebook effective gains                                */
+                cl_ptr_Q5,              /* I    code length for each codebook vector                    */
+                mu_Q9,                  /* I    tradeoff between weighted error and rate                */
+				max_gain_Q7,            /* I    maximum sum of absolute LTP coefficients                */
+                cbk_size                /* I    number of vectors in codebook                           */
+            );
+
+            rate_dist_Q14 = silk_ADD_POS_SAT32( rate_dist_Q14, rate_dist_Q14_subfr );
+            sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7
+                                + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 ));
+
+            b_Q14_ptr += LTP_ORDER;
+            W_Q18_ptr += LTP_ORDER * LTP_ORDER;
+        }
+
+        /* Avoid never finding a codebook */
+        rate_dist_Q14 = silk_min( silk_int32_MAX - 1, rate_dist_Q14 );
+
+        if( rate_dist_Q14 < min_rate_dist_Q14 ) {
+            min_rate_dist_Q14 = rate_dist_Q14;
+            *periodicity_index = (opus_int8)k;
+            silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) );
+			best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7;
+        }
+
+        /* Break early in low-complexity mode if rate distortion is below threshold */
+        if( lowComplexity && ( rate_dist_Q14 < silk_LTP_gain_middle_avg_RD_Q14 ) ) {
+            break;
+        }
+    }
+
+    cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ];
+    for( j = 0; j < nb_subfr; j++ ) {
+        for( k = 0; k < LTP_ORDER; k++ ) {
+            B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 );
+        }
+    }
+	*sum_log_gain_Q7 = best_sum_log_gain_Q7;
+}
+
diff --git a/drivers/opus/silk/resampler.c b/drivers/opus/silk/resampler.c
new file mode 100644
index 0000000000..14b185c45e
--- /dev/null
+++ b/drivers/opus/silk/resampler.c
@@ -0,0 +1,215 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/*
+ * Matrix of resampling methods used:
+ *                                 Fs_out (kHz)
+ *                        8      12     16     24     48
+ *
+ *               8        C      UF     U      UF     UF
+ *              12        AF     C      UF     U      UF
+ * Fs_in (kHz)  16        D      AF     C      UF     UF
+ *              24        AF     D      AF     C      U
+ *              48        AF     AF     AF     D      C
+ *
+ * C   -> Copy (no resampling)
+ * D   -> Allpass-based 2x downsampling
+ * U   -> Allpass-based 2x upsampling
+ * UF  -> Allpass-based 2x upsampling followed by FIR interpolation
+ * AF  -> AR2 filter followed by FIR interpolation
+ */
+
+#include "resampler_private.h"
+
+/* Tables with delay compensation values to equalize total delay for different modes */
+static const opus_int8 delay_matrix_enc[ 5 ][ 3 ] = {
+/* in  \ out  8  12  16 */
+/*  8 */   {  6,  0,  3 },
+/* 12 */   {  0,  7,  3 },
+/* 16 */   {  0,  1, 10 },
+/* 24 */   {  0,  2,  6 },
+/* 48 */   { 18, 10, 12 }
+};
+
+static const opus_int8 delay_matrix_dec[ 3 ][ 5 ] = {
+/* in  \ out  8  12  16  24  48 */
+/*  8 */   {  4,  0,  2,  0,  0 },
+/* 12 */   {  0,  9,  4,  7,  4 },
+/* 16 */   {  0,  3, 12,  7,  7 }
+};
+
+/* Simple way to make [8000, 12000, 16000, 24000, 48000] to [0, 1, 2, 3, 4] */
+#define rateID(R) ( ( ( ((R)>>12) - ((R)>16000) ) >> ((R)>24000) ) - 1 )
+
+#define USE_silk_resampler_copy                     (0)
+#define USE_silk_resampler_private_up2_HQ_wrapper   (1)
+#define USE_silk_resampler_private_IIR_FIR          (2)
+#define USE_silk_resampler_private_down_FIR         (3)
+
+/* Initialize/reset the resampler state for a given pair of input/output sampling rates */
+opus_int silk_resampler_init(
+    silk_resampler_state_struct *S,                 /* I/O  Resampler state                                             */
+    opus_int32                  Fs_Hz_in,           /* I    Input sampling rate (Hz)                                    */
+    opus_int32                  Fs_Hz_out,          /* I    Output sampling rate (Hz)                                   */
+    opus_int                    forEnc              /* I    If 1: encoder; if 0: decoder                                */
+)
+{
+    opus_int up2x;
+
+    /* Clear state */
+    silk_memset( S, 0, sizeof( silk_resampler_state_struct ) );
+
+    /* Input checking */
+    if( forEnc ) {
+        if( ( Fs_Hz_in  != 8000 && Fs_Hz_in  != 12000 && Fs_Hz_in  != 16000 && Fs_Hz_in  != 24000 && Fs_Hz_in  != 48000 ) ||
+            ( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 ) ) {
+            silk_assert( 0 );
+            return -1;
+        }
+        S->inputDelay = delay_matrix_enc[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ];
+    } else {
+        if( ( Fs_Hz_in  != 8000 && Fs_Hz_in  != 12000 && Fs_Hz_in  != 16000 ) ||
+            ( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 && Fs_Hz_out != 24000 && Fs_Hz_out != 48000 ) ) {
+            silk_assert( 0 );
+            return -1;
+        }
+        S->inputDelay = delay_matrix_dec[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ];
+    }
+
+    S->Fs_in_kHz  = silk_DIV32_16( Fs_Hz_in,  1000 );
+    S->Fs_out_kHz = silk_DIV32_16( Fs_Hz_out, 1000 );
+
+    /* Number of samples processed per batch */
+    S->batchSize = S->Fs_in_kHz * RESAMPLER_MAX_BATCH_SIZE_MS;
+
+    /* Find resampler with the right sampling ratio */
+    up2x = 0;
+    if( Fs_Hz_out > Fs_Hz_in ) {
+        /* Upsample */
+        if( Fs_Hz_out == silk_MUL( Fs_Hz_in, 2 ) ) {                            /* Fs_out : Fs_in = 2 : 1 */
+            /* Special case: directly use 2x upsampler */
+            S->resampler_function = USE_silk_resampler_private_up2_HQ_wrapper;
+        } else {
+            /* Default resampler */
+            S->resampler_function = USE_silk_resampler_private_IIR_FIR;
+            up2x = 1;
+        }
+    } else if ( Fs_Hz_out < Fs_Hz_in ) {
+        /* Downsample */
+         S->resampler_function = USE_silk_resampler_private_down_FIR;
+        if( silk_MUL( Fs_Hz_out, 4 ) == silk_MUL( Fs_Hz_in, 3 ) ) {             /* Fs_out : Fs_in = 3 : 4 */
+            S->FIR_Fracs = 3;
+            S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0;
+            S->Coefs = silk_Resampler_3_4_COEFS;
+        } else if( silk_MUL( Fs_Hz_out, 3 ) == silk_MUL( Fs_Hz_in, 2 ) ) {      /* Fs_out : Fs_in = 2 : 3 */
+            S->FIR_Fracs = 2;
+            S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0;
+            S->Coefs = silk_Resampler_2_3_COEFS;
+        } else if( silk_MUL( Fs_Hz_out, 2 ) == Fs_Hz_in ) {                     /* Fs_out : Fs_in = 1 : 2 */
+            S->FIR_Fracs = 1;
+            S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR1;
+            S->Coefs = silk_Resampler_1_2_COEFS;
+        } else if( silk_MUL( Fs_Hz_out, 3 ) == Fs_Hz_in ) {                     /* Fs_out : Fs_in = 1 : 3 */
+            S->FIR_Fracs = 1;
+            S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
+            S->Coefs = silk_Resampler_1_3_COEFS;
+        } else if( silk_MUL( Fs_Hz_out, 4 ) == Fs_Hz_in ) {                     /* Fs_out : Fs_in = 1 : 4 */
+            S->FIR_Fracs = 1;
+            S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
+            S->Coefs = silk_Resampler_1_4_COEFS;
+        } else if( silk_MUL( Fs_Hz_out, 6 ) == Fs_Hz_in ) {                     /* Fs_out : Fs_in = 1 : 6 */
+            S->FIR_Fracs = 1;
+            S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
+            S->Coefs = silk_Resampler_1_6_COEFS;
+        } else {
+            /* None available */
+            silk_assert( 0 );
+            return -1;
+        }
+    } else {
+        /* Input and output sampling rates are equal: copy */
+        S->resampler_function = USE_silk_resampler_copy;
+    }
+
+    /* Ratio of input/output samples */
+    S->invRatio_Q16 = silk_LSHIFT32( silk_DIV32( silk_LSHIFT32( Fs_Hz_in, 14 + up2x ), Fs_Hz_out ), 2 );
+    /* Make sure the ratio is rounded up */
+    while( silk_SMULWW( S->invRatio_Q16, Fs_Hz_out ) < silk_LSHIFT32( Fs_Hz_in, up2x ) ) {
+        S->invRatio_Q16++;
+    }
+
+    return 0;
+}
+
+/* Resampler: convert from one sampling rate to another */
+/* Input and output sampling rate are at most 48000 Hz  */
+opus_int silk_resampler(
+    silk_resampler_state_struct *S,                 /* I/O  Resampler state                                             */
+    opus_int16                  out[],              /* O    Output signal                                               */
+    const opus_int16            in[],               /* I    Input signal                                                */
+    opus_int32                  inLen               /* I    Number of input samples                                     */
+)
+{
+    opus_int nSamples;
+
+    /* Need at least 1 ms of input data */
+    silk_assert( inLen >= S->Fs_in_kHz );
+    /* Delay can't exceed the 1 ms of buffering */
+    silk_assert( S->inputDelay <= S->Fs_in_kHz );
+
+    nSamples = S->Fs_in_kHz - S->inputDelay;
+
+    /* Copy to delay buffer */
+    silk_memcpy( &S->delayBuf[ S->inputDelay ], in, nSamples * sizeof( opus_int16 ) );
+
+    switch( S->resampler_function ) {
+        case USE_silk_resampler_private_up2_HQ_wrapper:
+            silk_resampler_private_up2_HQ_wrapper( S, out, S->delayBuf, S->Fs_in_kHz );
+            silk_resampler_private_up2_HQ_wrapper( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
+            break;
+        case USE_silk_resampler_private_IIR_FIR:
+            silk_resampler_private_IIR_FIR( S, out, S->delayBuf, S->Fs_in_kHz );
+            silk_resampler_private_IIR_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
+            break;
+        case USE_silk_resampler_private_down_FIR:
+            silk_resampler_private_down_FIR( S, out, S->delayBuf, S->Fs_in_kHz );
+            silk_resampler_private_down_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
+            break;
+        default:
+            silk_memcpy( out, S->delayBuf, S->Fs_in_kHz * sizeof( opus_int16 ) );
+            silk_memcpy( &out[ S->Fs_out_kHz ], &in[ nSamples ], ( inLen - S->Fs_in_kHz ) * sizeof( opus_int16 ) );
+    }
+
+    /* Copy to delay buffer */
+    silk_memcpy( S->delayBuf, &in[ inLen - S->inputDelay ], S->inputDelay * sizeof( opus_int16 ) );
+
+    return 0;
+}
diff --git a/drivers/opus/silk/resampler_down2.c b/drivers/opus/silk/resampler_down2.c
new file mode 100644
index 0000000000..5c4b27759a
--- /dev/null
+++ b/drivers/opus/silk/resampler_down2.c
@@ -0,0 +1,74 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "resampler_rom.h"
+
+/* Downsample by a factor 2 */
+void silk_resampler_down2(
+    opus_int32                  *S,                 /* I/O  State vector [ 2 ]                                          */
+    opus_int16                  *out,               /* O    Output signal [ floor(len/2) ]                              */
+    const opus_int16            *in,                /* I    Input signal [ len ]                                        */
+    opus_int32                  inLen               /* I    Number of input samples                                     */
+)
+{
+    opus_int32 k, len2 = silk_RSHIFT32( inLen, 1 );
+    opus_int32 in32, out32, Y, X;
+
+    silk_assert( silk_resampler_down2_0 > 0 );
+    silk_assert( silk_resampler_down2_1 < 0 );
+
+    /* Internal variables and state are in Q10 format */
+    for( k = 0; k < len2; k++ ) {
+        /* Convert to Q10 */
+        in32 = silk_LSHIFT( (opus_int32)in[ 2 * k ], 10 );
+
+        /* All-pass section for even input sample */
+        Y      = silk_SUB32( in32, S[ 0 ] );
+        X      = silk_SMLAWB( Y, Y, silk_resampler_down2_1 );
+        out32  = silk_ADD32( S[ 0 ], X );
+        S[ 0 ] = silk_ADD32( in32, X );
+
+        /* Convert to Q10 */
+        in32 = silk_LSHIFT( (opus_int32)in[ 2 * k + 1 ], 10 );
+
+        /* All-pass section for odd input sample, and add to output of previous section */
+        Y      = silk_SUB32( in32, S[ 1 ] );
+        X      = silk_SMULWB( Y, silk_resampler_down2_0 );
+        out32  = silk_ADD32( out32, S[ 1 ] );
+        out32  = silk_ADD32( out32, X );
+        S[ 1 ] = silk_ADD32( in32, X );
+
+        /* Add, convert back to int16 and store to output */
+        out[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32, 11 ) );
+    }
+}
+
diff --git a/drivers/opus/silk/resampler_down2_3.c b/drivers/opus/silk/resampler_down2_3.c
new file mode 100644
index 0000000000..2733072fe6
--- /dev/null
+++ b/drivers/opus/silk/resampler_down2_3.c
@@ -0,0 +1,103 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "resampler_private.h"
+#include "stack_alloc.h"
+
+#define ORDER_FIR                   4
+
+/* Downsample by a factor 2/3, low quality */
+void silk_resampler_down2_3(
+    opus_int32                  *S,                 /* I/O  State vector [ 6 ]                                          */
+    opus_int16                  *out,               /* O    Output signal [ floor(2*inLen/3) ]                          */
+    const opus_int16            *in,                /* I    Input signal [ inLen ]                                      */
+    opus_int32                  inLen               /* I    Number of input samples                                     */
+)
+{
+    opus_int32 nSamplesIn, counter, res_Q6;
+    VARDECL( opus_int32, buf );
+    opus_int32 *buf_ptr;
+    SAVE_STACK;
+
+    ALLOC( buf, RESAMPLER_MAX_BATCH_SIZE_IN + ORDER_FIR, opus_int32 );
+
+    /* Copy buffered samples to start of buffer */
+    silk_memcpy( buf, S, ORDER_FIR * sizeof( opus_int32 ) );
+
+    /* Iterate over blocks of frameSizeIn input samples */
+    while( 1 ) {
+        nSamplesIn = silk_min( inLen, RESAMPLER_MAX_BATCH_SIZE_IN );
+
+        /* Second-order AR filter (output in Q8) */
+        silk_resampler_private_AR2( &S[ ORDER_FIR ], &buf[ ORDER_FIR ], in,
+            silk_Resampler_2_3_COEFS_LQ, nSamplesIn );
+
+        /* Interpolate filtered signal */
+        buf_ptr = buf;
+        counter = nSamplesIn;
+        while( counter > 2 ) {
+            /* Inner product */
+            res_Q6 = silk_SMULWB(         buf_ptr[ 0 ], silk_Resampler_2_3_COEFS_LQ[ 2 ] );
+            res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 1 ], silk_Resampler_2_3_COEFS_LQ[ 3 ] );
+            res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 2 ], silk_Resampler_2_3_COEFS_LQ[ 5 ] );
+            res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 3 ], silk_Resampler_2_3_COEFS_LQ[ 4 ] );
+
+            /* Scale down, saturate and store in output array */
+            *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
+
+            res_Q6 = silk_SMULWB(         buf_ptr[ 1 ], silk_Resampler_2_3_COEFS_LQ[ 4 ] );
+            res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 2 ], silk_Resampler_2_3_COEFS_LQ[ 5 ] );
+            res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 3 ], silk_Resampler_2_3_COEFS_LQ[ 3 ] );
+            res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 4 ], silk_Resampler_2_3_COEFS_LQ[ 2 ] );
+
+            /* Scale down, saturate and store in output array */
+            *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
+
+            buf_ptr += 3;
+            counter -= 3;
+        }
+
+        in += nSamplesIn;
+        inLen -= nSamplesIn;
+
+        if( inLen > 0 ) {
+            /* More iterations to do; copy last part of filtered signal to beginning of buffer */
+            silk_memcpy( buf, &buf[ nSamplesIn ], ORDER_FIR * sizeof( opus_int32 ) );
+        } else {
+            break;
+        }
+    }
+
+    /* Copy last part of filtered signal to the state for the next call */
+    silk_memcpy( S, &buf[ nSamplesIn ], ORDER_FIR * sizeof( opus_int32 ) );
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/resampler_private.h b/drivers/opus/silk/resampler_private.h
new file mode 100644
index 0000000000..422a7d9d95
--- /dev/null
+++ b/drivers/opus/silk/resampler_private.h
@@ -0,0 +1,88 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_RESAMPLER_PRIVATE_H
+#define SILK_RESAMPLER_PRIVATE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "SigProc_FIX.h"
+#include "resampler_structs.h"
+#include "resampler_rom.h"
+
+/* Number of input samples to process in the inner loop */
+#define RESAMPLER_MAX_BATCH_SIZE_MS             10
+#define RESAMPLER_MAX_FS_KHZ                    48
+#define RESAMPLER_MAX_BATCH_SIZE_IN             ( RESAMPLER_MAX_BATCH_SIZE_MS * RESAMPLER_MAX_FS_KHZ )
+
+/* Description: Hybrid IIR/FIR polyphase implementation of resampling */
+void silk_resampler_private_IIR_FIR(
+    void                            *SS,            /* I/O  Resampler state             */
+    opus_int16                      out[],          /* O    Output signal               */
+    const opus_int16                in[],           /* I    Input signal                */
+    opus_int32                      inLen           /* I    Number of input samples     */
+);
+
+/* Description: Hybrid IIR/FIR polyphase implementation of resampling */
+void silk_resampler_private_down_FIR(
+    void                            *SS,            /* I/O  Resampler state             */
+    opus_int16                      out[],          /* O    Output signal               */
+    const opus_int16                in[],           /* I    Input signal                */
+    opus_int32                      inLen           /* I    Number of input samples     */
+);
+
+/* Upsample by a factor 2, high quality */
+void silk_resampler_private_up2_HQ_wrapper(
+    void                            *SS,            /* I/O  Resampler state (unused)    */
+    opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
+    const opus_int16                *in,            /* I    Input signal [ len ]        */
+    opus_int32                      len             /* I    Number of input samples     */
+);
+
+/* Upsample by a factor 2, high quality */
+void silk_resampler_private_up2_HQ(
+    opus_int32                      *S,             /* I/O  Resampler state [ 6 ]       */
+    opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
+    const opus_int16                *in,            /* I    Input signal [ len ]        */
+    opus_int32                      len             /* I    Number of input samples     */
+);
+
+/* Second order AR filter */
+void silk_resampler_private_AR2(
+    opus_int32                      S[],            /* I/O  State vector [ 2 ]          */
+    opus_int32                      out_Q8[],       /* O    Output signal               */
+    const opus_int16                in[],           /* I    Input signal                */
+    const opus_int16                A_Q14[],        /* I    AR coefficients, Q14        */
+    opus_int32                      len             /* I    Signal length               */
+);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* SILK_RESAMPLER_PRIVATE_H */
diff --git a/drivers/opus/silk/resampler_private_AR2.c b/drivers/opus/silk/resampler_private_AR2.c
new file mode 100644
index 0000000000..84157d17ba
--- /dev/null
+++ b/drivers/opus/silk/resampler_private_AR2.c
@@ -0,0 +1,55 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "resampler_private.h"
+
+/* Second order AR filter with single delay elements */
+void silk_resampler_private_AR2(
+    opus_int32                      S[],            /* I/O  State vector [ 2 ]          */
+    opus_int32                      out_Q8[],       /* O    Output signal               */
+    const opus_int16                in[],           /* I    Input signal                */
+    const opus_int16                A_Q14[],        /* I    AR coefficients, Q14        */
+    opus_int32                      len             /* I    Signal length               */
+)
+{
+    opus_int32    k;
+    opus_int32    out32;
+
+    for( k = 0; k < len; k++ ) {
+        out32       = silk_ADD_LSHIFT32( S[ 0 ], (opus_int32)in[ k ], 8 );
+        out_Q8[ k ] = out32;
+        out32       = silk_LSHIFT( out32, 2 );
+        S[ 0 ]      = silk_SMLAWB( S[ 1 ], out32, A_Q14[ 0 ] );
+        S[ 1 ]      = silk_SMULWB( out32, A_Q14[ 1 ] );
+    }
+}
+
diff --git a/drivers/opus/silk/resampler_private_IIR_FIR.c b/drivers/opus/silk/resampler_private_IIR_FIR.c
new file mode 100644
index 0000000000..f45c3e7413
--- /dev/null
+++ b/drivers/opus/silk/resampler_private_IIR_FIR.c
@@ -0,0 +1,107 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "resampler_private.h"
+#include "stack_alloc.h"
+
+static OPUS_INLINE opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL(
+    opus_int16  *out,
+    opus_int16  *buf,
+    opus_int32  max_index_Q16,
+    opus_int32  index_increment_Q16
+)
+{
+    opus_int32 index_Q16, res_Q15;
+    opus_int16 *buf_ptr;
+    opus_int32 table_index;
+
+    /* Interpolate upsampled signal and store in output array */
+    for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
+        table_index = silk_SMULWB( index_Q16 & 0xFFFF, 12 );
+        buf_ptr = &buf[ index_Q16 >> 16 ];
+
+        res_Q15 = silk_SMULBB(          buf_ptr[ 0 ], silk_resampler_frac_FIR_12[      table_index ][ 0 ] );
+        res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 1 ], silk_resampler_frac_FIR_12[      table_index ][ 1 ] );
+        res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 2 ], silk_resampler_frac_FIR_12[      table_index ][ 2 ] );
+        res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 3 ], silk_resampler_frac_FIR_12[      table_index ][ 3 ] );
+        res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 4 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 3 ] );
+        res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 5 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 2 ] );
+        res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 6 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 1 ] );
+        res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 7 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 0 ] );
+        *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q15, 15 ) );
+    }
+    return out;
+}
+/* Upsample using a combination of allpass-based 2x upsampling and FIR interpolation */
+void silk_resampler_private_IIR_FIR(
+    void                            *SS,            /* I/O  Resampler state             */
+    opus_int16                      out[],          /* O    Output signal               */
+    const opus_int16                in[],           /* I    Input signal                */
+    opus_int32                      inLen           /* I    Number of input samples     */
+)
+{
+    silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
+    opus_int32 nSamplesIn;
+    opus_int32 max_index_Q16, index_increment_Q16;
+    VARDECL( opus_int16, buf );
+    SAVE_STACK;
+
+    ALLOC( buf, 2 * S->batchSize + RESAMPLER_ORDER_FIR_12, opus_int16 );
+
+    /* Copy buffered samples to start of buffer */
+    silk_memcpy( buf, S->sFIR.i16, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
+
+    /* Iterate over blocks of frameSizeIn input samples */
+    index_increment_Q16 = S->invRatio_Q16;
+    while( 1 ) {
+        nSamplesIn = silk_min( inLen, S->batchSize );
+
+        /* Upsample 2x */
+        silk_resampler_private_up2_HQ( S->sIIR, &buf[ RESAMPLER_ORDER_FIR_12 ], in, nSamplesIn );
+
+        max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 + 1 );         /* + 1 because 2x upsampling */
+        out = silk_resampler_private_IIR_FIR_INTERPOL( out, buf, max_index_Q16, index_increment_Q16 );
+        in += nSamplesIn;
+        inLen -= nSamplesIn;
+
+        if( inLen > 0 ) {
+            /* More iterations to do; copy last part of filtered signal to beginning of buffer */
+            silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
+        } else {
+            break;
+        }
+    }
+
+    /* Copy last part of filtered signal to the state for the next call */
+    silk_memcpy( S->sFIR.i16, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/resampler_private_down_FIR.c b/drivers/opus/silk/resampler_private_down_FIR.c
new file mode 100644
index 0000000000..f4de303546
--- /dev/null
+++ b/drivers/opus/silk/resampler_private_down_FIR.c
@@ -0,0 +1,194 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "resampler_private.h"
+#include "stack_alloc.h"
+
+static OPUS_INLINE opus_int16 *silk_resampler_private_down_FIR_INTERPOL(
+    opus_int16          *out,
+    opus_int32          *buf,
+    const opus_int16    *FIR_Coefs,
+    opus_int            FIR_Order,
+    opus_int            FIR_Fracs,
+    opus_int32          max_index_Q16,
+    opus_int32          index_increment_Q16
+)
+{
+    opus_int32 index_Q16, res_Q6;
+    opus_int32 *buf_ptr;
+    opus_int32 interpol_ind;
+    const opus_int16 *interpol_ptr;
+
+    switch( FIR_Order ) {
+        case RESAMPLER_DOWN_ORDER_FIR0:
+            for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
+                /* Integer part gives pointer to buffered input */
+                buf_ptr = buf + silk_RSHIFT( index_Q16, 16 );
+
+                /* Fractional part gives interpolation coefficients */
+                interpol_ind = silk_SMULWB( index_Q16 & 0xFFFF, FIR_Fracs );
+
+                /* Inner product */
+                interpol_ptr = &FIR_Coefs[ RESAMPLER_DOWN_ORDER_FIR0 / 2 * interpol_ind ];
+                res_Q6 = silk_SMULWB(         buf_ptr[ 0 ], interpol_ptr[ 0 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 1 ], interpol_ptr[ 1 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 2 ], interpol_ptr[ 2 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 3 ], interpol_ptr[ 3 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 4 ], interpol_ptr[ 4 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 5 ], interpol_ptr[ 5 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 6 ], interpol_ptr[ 6 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 7 ], interpol_ptr[ 7 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 8 ], interpol_ptr[ 8 ] );
+                interpol_ptr = &FIR_Coefs[ RESAMPLER_DOWN_ORDER_FIR0 / 2 * ( FIR_Fracs - 1 - interpol_ind ) ];
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 17 ], interpol_ptr[ 0 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 16 ], interpol_ptr[ 1 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 15 ], interpol_ptr[ 2 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 14 ], interpol_ptr[ 3 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 13 ], interpol_ptr[ 4 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 12 ], interpol_ptr[ 5 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 11 ], interpol_ptr[ 6 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[ 10 ], interpol_ptr[ 7 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, buf_ptr[  9 ], interpol_ptr[ 8 ] );
+
+                /* Scale down, saturate and store in output array */
+                *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
+            }
+            break;
+        case RESAMPLER_DOWN_ORDER_FIR1:
+            for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
+                /* Integer part gives pointer to buffered input */
+                buf_ptr = buf + silk_RSHIFT( index_Q16, 16 );
+
+                /* Inner product */
+                res_Q6 = silk_SMULWB(         silk_ADD32( buf_ptr[  0 ], buf_ptr[ 23 ] ), FIR_Coefs[  0 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  1 ], buf_ptr[ 22 ] ), FIR_Coefs[  1 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  2 ], buf_ptr[ 21 ] ), FIR_Coefs[  2 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  3 ], buf_ptr[ 20 ] ), FIR_Coefs[  3 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  4 ], buf_ptr[ 19 ] ), FIR_Coefs[  4 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  5 ], buf_ptr[ 18 ] ), FIR_Coefs[  5 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  6 ], buf_ptr[ 17 ] ), FIR_Coefs[  6 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  7 ], buf_ptr[ 16 ] ), FIR_Coefs[  7 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  8 ], buf_ptr[ 15 ] ), FIR_Coefs[  8 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  9 ], buf_ptr[ 14 ] ), FIR_Coefs[  9 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 10 ], buf_ptr[ 13 ] ), FIR_Coefs[ 10 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 11 ], buf_ptr[ 12 ] ), FIR_Coefs[ 11 ] );
+
+                /* Scale down, saturate and store in output array */
+                *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
+            }
+            break;
+        case RESAMPLER_DOWN_ORDER_FIR2:
+            for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) {
+                /* Integer part gives pointer to buffered input */
+                buf_ptr = buf + silk_RSHIFT( index_Q16, 16 );
+
+                /* Inner product */
+                res_Q6 = silk_SMULWB(         silk_ADD32( buf_ptr[  0 ], buf_ptr[ 35 ] ), FIR_Coefs[  0 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  1 ], buf_ptr[ 34 ] ), FIR_Coefs[  1 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  2 ], buf_ptr[ 33 ] ), FIR_Coefs[  2 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  3 ], buf_ptr[ 32 ] ), FIR_Coefs[  3 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  4 ], buf_ptr[ 31 ] ), FIR_Coefs[  4 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  5 ], buf_ptr[ 30 ] ), FIR_Coefs[  5 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  6 ], buf_ptr[ 29 ] ), FIR_Coefs[  6 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  7 ], buf_ptr[ 28 ] ), FIR_Coefs[  7 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  8 ], buf_ptr[ 27 ] ), FIR_Coefs[  8 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[  9 ], buf_ptr[ 26 ] ), FIR_Coefs[  9 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 10 ], buf_ptr[ 25 ] ), FIR_Coefs[ 10 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 11 ], buf_ptr[ 24 ] ), FIR_Coefs[ 11 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 12 ], buf_ptr[ 23 ] ), FIR_Coefs[ 12 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 13 ], buf_ptr[ 22 ] ), FIR_Coefs[ 13 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 14 ], buf_ptr[ 21 ] ), FIR_Coefs[ 14 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 15 ], buf_ptr[ 20 ] ), FIR_Coefs[ 15 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 16 ], buf_ptr[ 19 ] ), FIR_Coefs[ 16 ] );
+                res_Q6 = silk_SMLAWB( res_Q6, silk_ADD32( buf_ptr[ 17 ], buf_ptr[ 18 ] ), FIR_Coefs[ 17 ] );
+
+                /* Scale down, saturate and store in output array */
+                *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q6, 6 ) );
+            }
+            break;
+        default:
+            silk_assert( 0 );
+    }
+    return out;
+}
+
+/* Resample with a 2nd order AR filter followed by FIR interpolation */
+void silk_resampler_private_down_FIR(
+    void                            *SS,            /* I/O  Resampler state             */
+    opus_int16                      out[],          /* O    Output signal               */
+    const opus_int16                in[],           /* I    Input signal                */
+    opus_int32                      inLen           /* I    Number of input samples     */
+)
+{
+    silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
+    opus_int32 nSamplesIn;
+    opus_int32 max_index_Q16, index_increment_Q16;
+    VARDECL( opus_int32, buf );
+    const opus_int16 *FIR_Coefs;
+    SAVE_STACK;
+
+    ALLOC( buf, S->batchSize + S->FIR_Order, opus_int32 );
+
+    /* Copy buffered samples to start of buffer */
+    silk_memcpy( buf, S->sFIR.i32, S->FIR_Order * sizeof( opus_int32 ) );
+
+    FIR_Coefs = &S->Coefs[ 2 ];
+
+    /* Iterate over blocks of frameSizeIn input samples */
+    index_increment_Q16 = S->invRatio_Q16;
+    while( 1 ) {
+        nSamplesIn = silk_min( inLen, S->batchSize );
+
+        /* Second-order AR filter (output in Q8) */
+        silk_resampler_private_AR2( S->sIIR, &buf[ S->FIR_Order ], in, S->Coefs, nSamplesIn );
+
+        max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 );
+
+        /* Interpolate filtered signal */
+        out = silk_resampler_private_down_FIR_INTERPOL( out, buf, FIR_Coefs, S->FIR_Order,
+            S->FIR_Fracs, max_index_Q16, index_increment_Q16 );
+
+        in += nSamplesIn;
+        inLen -= nSamplesIn;
+
+        if( inLen > 1 ) {
+            /* More iterations to do; copy last part of filtered signal to beginning of buffer */
+            silk_memcpy( buf, &buf[ nSamplesIn ], S->FIR_Order * sizeof( opus_int32 ) );
+        } else {
+            break;
+        }
+    }
+
+    /* Copy last part of filtered signal to the state for the next call */
+    silk_memcpy( S->sFIR.i32, &buf[ nSamplesIn ], S->FIR_Order * sizeof( opus_int32 ) );
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/resampler_private_up2_HQ.c b/drivers/opus/silk/resampler_private_up2_HQ.c
new file mode 100644
index 0000000000..39f4818454
--- /dev/null
+++ b/drivers/opus/silk/resampler_private_up2_HQ.c
@@ -0,0 +1,113 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+#include "resampler_private.h"
+
+/* Upsample by a factor 2, high quality */
+/* Uses 2nd order allpass filters for the 2x upsampling, followed by a      */
+/* notch filter just above Nyquist.                                         */
+void silk_resampler_private_up2_HQ(
+    opus_int32                      *S,             /* I/O  Resampler state [ 6 ]       */
+    opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
+    const opus_int16                *in,            /* I    Input signal [ len ]        */
+    opus_int32                      len             /* I    Number of input samples     */
+)
+{
+    opus_int32 k;
+    opus_int32 in32, out32_1, out32_2, Y, X;
+
+    silk_assert( silk_resampler_up2_hq_0[ 0 ] > 0 );
+    silk_assert( silk_resampler_up2_hq_0[ 1 ] > 0 );
+    silk_assert( silk_resampler_up2_hq_0[ 2 ] < 0 );
+    silk_assert( silk_resampler_up2_hq_1[ 0 ] > 0 );
+    silk_assert( silk_resampler_up2_hq_1[ 1 ] > 0 );
+    silk_assert( silk_resampler_up2_hq_1[ 2 ] < 0 );
+
+    /* Internal variables and state are in Q10 format */
+    for( k = 0; k < len; k++ ) {
+        /* Convert to Q10 */
+        in32 = silk_LSHIFT( (opus_int32)in[ k ], 10 );
+
+        /* First all-pass section for even output sample */
+        Y       = silk_SUB32( in32, S[ 0 ] );
+        X       = silk_SMULWB( Y, silk_resampler_up2_hq_0[ 0 ] );
+        out32_1 = silk_ADD32( S[ 0 ], X );
+        S[ 0 ]  = silk_ADD32( in32, X );
+
+        /* Second all-pass section for even output sample */
+        Y       = silk_SUB32( out32_1, S[ 1 ] );
+        X       = silk_SMULWB( Y, silk_resampler_up2_hq_0[ 1 ] );
+        out32_2 = silk_ADD32( S[ 1 ], X );
+        S[ 1 ]  = silk_ADD32( out32_1, X );
+
+        /* Third all-pass section for even output sample */
+        Y       = silk_SUB32( out32_2, S[ 2 ] );
+        X       = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_0[ 2 ] );
+        out32_1 = silk_ADD32( S[ 2 ], X );
+        S[ 2 ]  = silk_ADD32( out32_2, X );
+
+        /* Apply gain in Q15, convert back to int16 and store to output */
+        out[ 2 * k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32_1, 10 ) );
+
+        /* First all-pass section for odd output sample */
+        Y       = silk_SUB32( in32, S[ 3 ] );
+        X       = silk_SMULWB( Y, silk_resampler_up2_hq_1[ 0 ] );
+        out32_1 = silk_ADD32( S[ 3 ], X );
+        S[ 3 ]  = silk_ADD32( in32, X );
+
+        /* Second all-pass section for odd output sample */
+        Y       = silk_SUB32( out32_1, S[ 4 ] );
+        X       = silk_SMULWB( Y, silk_resampler_up2_hq_1[ 1 ] );
+        out32_2 = silk_ADD32( S[ 4 ], X );
+        S[ 4 ]  = silk_ADD32( out32_1, X );
+
+        /* Third all-pass section for odd output sample */
+        Y       = silk_SUB32( out32_2, S[ 5 ] );
+        X       = silk_SMLAWB( Y, Y, silk_resampler_up2_hq_1[ 2 ] );
+        out32_1 = silk_ADD32( S[ 5 ], X );
+        S[ 5 ]  = silk_ADD32( out32_2, X );
+
+        /* Apply gain in Q15, convert back to int16 and store to output */
+        out[ 2 * k + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( out32_1, 10 ) );
+    }
+}
+
+void silk_resampler_private_up2_HQ_wrapper(
+    void                            *SS,            /* I/O  Resampler state (unused)    */
+    opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
+    const opus_int16                *in,            /* I    Input signal [ len ]        */
+    opus_int32                      len             /* I    Number of input samples     */
+)
+{
+    silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
+    silk_resampler_private_up2_HQ( S->sIIR, out, in, len );
+}
diff --git a/drivers/opus/silk/resampler_rom.c b/drivers/opus/silk/resampler_rom.c
new file mode 100644
index 0000000000..0098e18ba8
--- /dev/null
+++ b/drivers/opus/silk/resampler_rom.c
@@ -0,0 +1,96 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/* Filter coefficients for IIR/FIR polyphase resampling     *
+ * Total size: 179 Words (358 Bytes)                        */
+
+#include "resampler_private.h"
+
+/* Matlab code for the notch filter coefficients: */
+/* B = [1, 0.147, 1];  A = [1, 0.107, 0.89]; G = 0.93; freqz(G * B, A, 2^14, 16e3); axis([0, 8000, -10, 1]) */
+/* fprintf('\t%6d, %6d, %6d, %6d\n', round(B(2)*2^16), round(-A(2)*2^16), round((1-A(3))*2^16), round(G*2^15)) */
+/* const opus_int16 silk_resampler_up2_hq_notch[ 4 ] = { 9634,  -7012,   7209,  30474 }; */
+
+/* Tables with IIR and FIR coefficients for fractional downsamplers (123 Words) */
+silk_DWORD_ALIGN const opus_int16 silk_Resampler_3_4_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = {
+	-20694, -13867,
+	   -49,     64,     17,   -157,    353,   -496,    163,  11047,  22205,
+	   -39,      6,     91,   -170,    186,     23,   -896,   6336,  19928,
+	   -19,    -36,    102,    -89,    -24,    328,   -951,   2568,  15909,
+};
+
+silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS[ 2 + 2 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ] = {
+	-14457, -14019,
+	    64,    128,   -122,     36,    310,   -768,    584,   9267,  17733,
+	    12,    128,     18,   -142,    288,   -117,   -865,   4123,  14459,
+};
+
+silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_2_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR1 / 2 ] = {
+	   616, -14323,
+	   -10,     39,     58,    -46,    -84,    120,    184,   -315,   -541,   1284,   5380,   9024,
+};
+
+silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_3_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
+	 16102, -15162,
+	   -13,      0,     20,     26,      5,    -31,    -43,     -4,     65,     90,      7,   -157,   -248,    -44,    593,   1583,   2612,   3271,
+};
+
+silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_4_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
+	 22500, -15099,
+	     3,    -14,    -20,    -15,      2,     25,     37,     25,    -16,    -71,   -107,    -79,     50,    292,    623,    982,   1288,   1464,
+};
+
+silk_DWORD_ALIGN const opus_int16 silk_Resampler_1_6_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR2 / 2 ] = {
+	 27540, -15257,
+	    17,     12,      8,      1,    -10,    -22,    -30,    -32,    -22,      3,     44,    100,    168,    243,    317,    381,    429,    455,
+};
+
+silk_DWORD_ALIGN const opus_int16 silk_Resampler_2_3_COEFS_LQ[ 2 + 2 * 2 ] = {
+     -2797,  -6507,
+      4697,  10739,
+      1567,   8276,
+};
+
+/* Table with interplation fractions of 1/24, 3/24, 5/24, ... , 23/24 : 23/24 (46 Words) */
+silk_DWORD_ALIGN const opus_int16 silk_resampler_frac_FIR_12[ 12 ][ RESAMPLER_ORDER_FIR_12 / 2 ] = {
+	{  189,  -600,   617, 30567 },
+	{  117,  -159, -1070, 29704 },
+	{   52,   221, -2392, 28276 },
+	{   -4,   529, -3350, 26341 },
+	{  -48,   758, -3956, 23973 },
+	{  -80,   905, -4235, 21254 },
+	{  -99,   972, -4222, 18278 },
+	{ -107,   967, -3957, 15143 },
+	{ -103,   896, -3487, 11950 },
+	{  -91,   773, -2865,  8798 },
+	{  -71,   611, -2143,  5784 },
+	{  -46,   425, -1375,  2996 },
+};
diff --git a/drivers/opus/silk/resampler_rom.h b/drivers/opus/silk/resampler_rom.h
new file mode 100644
index 0000000000..490b3388dc
--- /dev/null
+++ b/drivers/opus/silk/resampler_rom.h
@@ -0,0 +1,68 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_FIX_RESAMPLER_ROM_H
+#define SILK_FIX_RESAMPLER_ROM_H
+
+#ifdef  __cplusplus
+extern "C"
+{
+#endif
+
+#include "typedef.h"
+#include "resampler_structs.h"
+
+#define RESAMPLER_DOWN_ORDER_FIR0               18
+#define RESAMPLER_DOWN_ORDER_FIR1               24
+#define RESAMPLER_DOWN_ORDER_FIR2               36
+#define RESAMPLER_ORDER_FIR_12                  8
+
+/* Tables for 2x downsampler */
+static const opus_int16 silk_resampler_down2_0 = 9872;
+static const opus_int16 silk_resampler_down2_1 = 39809 - 65536;
+
+/* Tables for 2x upsampler, high quality */
+static const opus_int16 silk_resampler_up2_hq_0[ 3 ] = { 1746, 14986, 39083 - 65536 };
+static const opus_int16 silk_resampler_up2_hq_1[ 3 ] = { 6854, 25769, 55542 - 65536 };
+
+/* Tables with IIR and FIR coefficients for fractional downsamplers */
+extern const opus_int16 silk_Resampler_3_4_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ];
+extern const opus_int16 silk_Resampler_2_3_COEFS[ 2 + 2 * RESAMPLER_DOWN_ORDER_FIR0 / 2 ];
+extern const opus_int16 silk_Resampler_1_2_COEFS[ 2 +     RESAMPLER_DOWN_ORDER_FIR1 / 2 ];
+extern const opus_int16 silk_Resampler_1_3_COEFS[ 2 +     RESAMPLER_DOWN_ORDER_FIR2 / 2 ];
+extern const opus_int16 silk_Resampler_1_4_COEFS[ 2 +     RESAMPLER_DOWN_ORDER_FIR2 / 2 ];
+extern const opus_int16 silk_Resampler_1_6_COEFS[ 2 +     RESAMPLER_DOWN_ORDER_FIR2 / 2 ];
+extern const opus_int16 silk_Resampler_2_3_COEFS_LQ[ 2 + 2 * 2 ];
+
+/* Table with interplation fractions of 1/24, 3/24, ..., 23/24 */
+extern const opus_int16 silk_resampler_frac_FIR_12[ 12 ][ RESAMPLER_ORDER_FIR_12 / 2 ];
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* SILK_FIX_RESAMPLER_ROM_H */
diff --git a/drivers/opus/silk/resampler_structs.h b/drivers/opus/silk/resampler_structs.h
new file mode 100644
index 0000000000..9e9457d11c
--- /dev/null
+++ b/drivers/opus/silk/resampler_structs.h
@@ -0,0 +1,60 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_RESAMPLER_STRUCTS_H
+#define SILK_RESAMPLER_STRUCTS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SILK_RESAMPLER_MAX_FIR_ORDER                 36
+#define SILK_RESAMPLER_MAX_IIR_ORDER                 6
+
+typedef struct _silk_resampler_state_struct{
+    opus_int32       sIIR[ SILK_RESAMPLER_MAX_IIR_ORDER ]; /* this must be the first element of this struct */
+    union{
+        opus_int32   i32[ SILK_RESAMPLER_MAX_FIR_ORDER ];
+        opus_int16   i16[ SILK_RESAMPLER_MAX_FIR_ORDER ];
+    }                sFIR;
+    opus_int16       delayBuf[ 48 ];
+    opus_int         resampler_function;
+    opus_int         batchSize;
+    opus_int32       invRatio_Q16;
+    opus_int         FIR_Order;
+    opus_int         FIR_Fracs;
+    opus_int         Fs_in_kHz;
+    opus_int         Fs_out_kHz;
+    opus_int         inputDelay;
+    const opus_int16 *Coefs;
+} silk_resampler_state_struct;
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* SILK_RESAMPLER_STRUCTS_H */
+
diff --git a/drivers/opus/silk/shell_coder.c b/drivers/opus/silk/shell_coder.c
new file mode 100644
index 0000000000..79e392bd98
--- /dev/null
+++ b/drivers/opus/silk/shell_coder.c
@@ -0,0 +1,151 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* shell coder; pulse-subframe length is hardcoded */
+
+static OPUS_INLINE void combine_pulses(
+    opus_int         *out,   /* O    combined pulses vector [len] */
+    const opus_int   *in,    /* I    input vector       [2 * len] */
+    const opus_int   len     /* I    number of OUTPUT samples     */
+)
+{
+    opus_int k;
+    for( k = 0; k < len; k++ ) {
+        out[ k ] = in[ 2 * k ] + in[ 2 * k + 1 ];
+    }
+}
+
+static OPUS_INLINE void encode_split(
+    ec_enc                      *psRangeEnc,    /* I/O  compressor data structure                   */
+    const opus_int              p_child1,       /* I    pulse amplitude of first child subframe     */
+    const opus_int              p,              /* I    pulse amplitude of current subframe         */
+    const opus_uint8            *shell_table    /* I    table of shell cdfs                         */
+)
+{
+    if( p > 0 ) {
+        ec_enc_icdf( psRangeEnc, p_child1, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
+    }
+}
+
+static OPUS_INLINE void decode_split(
+    opus_int                    *p_child1,      /* O    pulse amplitude of first child subframe     */
+    opus_int                    *p_child2,      /* O    pulse amplitude of second child subframe    */
+    ec_dec                      *psRangeDec,    /* I/O  Compressor data structure                   */
+    const opus_int              p,              /* I    pulse amplitude of current subframe         */
+    const opus_uint8            *shell_table    /* I    table of shell cdfs                         */
+)
+{
+    if( p > 0 ) {
+        p_child1[ 0 ] = ec_dec_icdf( psRangeDec, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
+        p_child2[ 0 ] = p - p_child1[ 0 ];
+    } else {
+        p_child1[ 0 ] = 0;
+        p_child2[ 0 ] = 0;
+    }
+}
+
+/* Shell encoder, operates on one shell code frame of 16 pulses */
+void silk_shell_encoder(
+    ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
+    const opus_int              *pulses0                        /* I    data: nonnegative pulse amplitudes          */
+)
+{
+    opus_int pulses1[ 8 ], pulses2[ 4 ], pulses3[ 2 ], pulses4[ 1 ];
+
+    /* this function operates on one shell code frame of 16 pulses */
+    silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
+
+    /* tree representation per pulse-subframe */
+    combine_pulses( pulses1, pulses0, 8 );
+    combine_pulses( pulses2, pulses1, 4 );
+    combine_pulses( pulses3, pulses2, 2 );
+    combine_pulses( pulses4, pulses3, 1 );
+
+    encode_split( psRangeEnc, pulses3[  0 ], pulses4[ 0 ], silk_shell_code_table3 );
+
+    encode_split( psRangeEnc, pulses2[  0 ], pulses3[ 0 ], silk_shell_code_table2 );
+
+    encode_split( psRangeEnc, pulses1[  0 ], pulses2[ 0 ], silk_shell_code_table1 );
+    encode_split( psRangeEnc, pulses0[  0 ], pulses1[ 0 ], silk_shell_code_table0 );
+    encode_split( psRangeEnc, pulses0[  2 ], pulses1[ 1 ], silk_shell_code_table0 );
+
+    encode_split( psRangeEnc, pulses1[  2 ], pulses2[ 1 ], silk_shell_code_table1 );
+    encode_split( psRangeEnc, pulses0[  4 ], pulses1[ 2 ], silk_shell_code_table0 );
+    encode_split( psRangeEnc, pulses0[  6 ], pulses1[ 3 ], silk_shell_code_table0 );
+
+    encode_split( psRangeEnc, pulses2[  2 ], pulses3[ 1 ], silk_shell_code_table2 );
+
+    encode_split( psRangeEnc, pulses1[  4 ], pulses2[ 2 ], silk_shell_code_table1 );
+    encode_split( psRangeEnc, pulses0[  8 ], pulses1[ 4 ], silk_shell_code_table0 );
+    encode_split( psRangeEnc, pulses0[ 10 ], pulses1[ 5 ], silk_shell_code_table0 );
+
+    encode_split( psRangeEnc, pulses1[  6 ], pulses2[ 3 ], silk_shell_code_table1 );
+    encode_split( psRangeEnc, pulses0[ 12 ], pulses1[ 6 ], silk_shell_code_table0 );
+    encode_split( psRangeEnc, pulses0[ 14 ], pulses1[ 7 ], silk_shell_code_table0 );
+}
+
+
+/* Shell decoder, operates on one shell code frame of 16 pulses */
+void silk_shell_decoder(
+    opus_int                    *pulses0,                       /* O    data: nonnegative pulse amplitudes          */
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    const opus_int              pulses4                         /* I    number of pulses per pulse-subframe         */
+)
+{
+    opus_int pulses3[ 2 ], pulses2[ 4 ], pulses1[ 8 ];
+
+    /* this function operates on one shell code frame of 16 pulses */
+    silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
+
+    decode_split( &pulses3[  0 ], &pulses3[  1 ], psRangeDec, pulses4,      silk_shell_code_table3 );
+
+    decode_split( &pulses2[  0 ], &pulses2[  1 ], psRangeDec, pulses3[ 0 ], silk_shell_code_table2 );
+
+    decode_split( &pulses1[  0 ], &pulses1[  1 ], psRangeDec, pulses2[ 0 ], silk_shell_code_table1 );
+    decode_split( &pulses0[  0 ], &pulses0[  1 ], psRangeDec, pulses1[ 0 ], silk_shell_code_table0 );
+    decode_split( &pulses0[  2 ], &pulses0[  3 ], psRangeDec, pulses1[ 1 ], silk_shell_code_table0 );
+
+    decode_split( &pulses1[  2 ], &pulses1[  3 ], psRangeDec, pulses2[ 1 ], silk_shell_code_table1 );
+    decode_split( &pulses0[  4 ], &pulses0[  5 ], psRangeDec, pulses1[ 2 ], silk_shell_code_table0 );
+    decode_split( &pulses0[  6 ], &pulses0[  7 ], psRangeDec, pulses1[ 3 ], silk_shell_code_table0 );
+
+    decode_split( &pulses2[  2 ], &pulses2[  3 ], psRangeDec, pulses3[ 1 ], silk_shell_code_table2 );
+
+    decode_split( &pulses1[  4 ], &pulses1[  5 ], psRangeDec, pulses2[ 2 ], silk_shell_code_table1 );
+    decode_split( &pulses0[  8 ], &pulses0[  9 ], psRangeDec, pulses1[ 4 ], silk_shell_code_table0 );
+    decode_split( &pulses0[ 10 ], &pulses0[ 11 ], psRangeDec, pulses1[ 5 ], silk_shell_code_table0 );
+
+    decode_split( &pulses1[  6 ], &pulses1[  7 ], psRangeDec, pulses2[ 3 ], silk_shell_code_table1 );
+    decode_split( &pulses0[ 12 ], &pulses0[ 13 ], psRangeDec, pulses1[ 6 ], silk_shell_code_table0 );
+    decode_split( &pulses0[ 14 ], &pulses0[ 15 ], psRangeDec, pulses1[ 7 ], silk_shell_code_table0 );
+}
diff --git a/drivers/opus/silk/sigm_Q15.c b/drivers/opus/silk/sigm_Q15.c
new file mode 100644
index 0000000000..2df5b9695c
--- /dev/null
+++ b/drivers/opus/silk/sigm_Q15.c
@@ -0,0 +1,76 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/* Approximate sigmoid function */
+
+#include "SigProc_FIX.h"
+
+/* fprintf(1, '%d, ', round(1024 * ([1 ./ (1 + exp(-(1:5))), 1] - 1 ./ (1 + exp(-(0:5)))))); */
+static const opus_int32 sigm_LUT_slope_Q10[ 6 ] = {
+    237, 153, 73, 30, 12, 7
+};
+/* fprintf(1, '%d, ', round(32767 * 1 ./ (1 + exp(-(0:5))))); */
+static const opus_int32 sigm_LUT_pos_Q15[ 6 ] = {
+    16384, 23955, 28861, 31213, 32178, 32548
+};
+/* fprintf(1, '%d, ', round(32767 * 1 ./ (1 + exp((0:5))))); */
+static const opus_int32 sigm_LUT_neg_Q15[ 6 ] = {
+    16384, 8812, 3906, 1554, 589, 219
+};
+
+opus_int silk_sigm_Q15(
+    opus_int                    in_Q5               /* I                                                                */
+)
+{
+    opus_int ind;
+
+    if( in_Q5 < 0 ) {
+        /* Negative input */
+        in_Q5 = -in_Q5;
+        if( in_Q5 >= 6 * 32 ) {
+            return 0;        /* Clip */
+        } else {
+            /* Linear interpolation of look up table */
+            ind = silk_RSHIFT( in_Q5, 5 );
+            return( sigm_LUT_neg_Q15[ ind ] - silk_SMULBB( sigm_LUT_slope_Q10[ ind ], in_Q5 & 0x1F ) );
+        }
+    } else {
+        /* Positive input */
+        if( in_Q5 >= 6 * 32 ) {
+            return 32767;        /* clip */
+        } else {
+            /* Linear interpolation of look up table */
+            ind = silk_RSHIFT( in_Q5, 5 );
+            return( sigm_LUT_pos_Q15[ ind ] + silk_SMULBB( sigm_LUT_slope_Q10[ ind ], in_Q5 & 0x1F ) );
+        }
+    }
+}
+
diff --git a/drivers/opus/silk/silk_main.h b/drivers/opus/silk/silk_main.h
new file mode 100644
index 0000000000..2bdf89784d
--- /dev/null
+++ b/drivers/opus/silk/silk_main.h
@@ -0,0 +1,438 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MAIN_H
+#define SILK_MAIN_H
+
+#include "SigProc_FIX.h"
+#include "define.h"
+#include "structs.h"
+#include "tables.h"
+#include "PLC.h"
+#include "control.h"
+#include "debug.h"
+#include "entenc.h"
+#include "entdec.h"
+
+/* Convert Left/Right stereo signal to adaptive Mid/Side representation */
+void silk_stereo_LR_to_MS(
+    stereo_enc_state            *state,                         /* I/O  State                                       */
+    opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
+    opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
+    opus_int8                   ix[ 2 ][ 3 ],                   /* O    Quantization indices                        */
+    opus_int8                   *mid_only_flag,                 /* O    Flag: only mid signal coded                 */
+    opus_int32                  mid_side_rates_bps[],           /* O    Bitrates for mid and side signals           */
+    opus_int32                  total_rate_bps,                 /* I    Total bitrate                               */
+    opus_int                    prev_speech_act_Q8,             /* I    Speech activity level in previous frame     */
+    opus_int                    toMono,                         /* I    Last frame before a stereo->mono transition */
+    opus_int                    fs_kHz,                         /* I    Sample rate (kHz)                           */
+    opus_int                    frame_length                    /* I    Number of samples                           */
+);
+
+/* Convert adaptive Mid/Side representation to Left/Right stereo signal */
+void silk_stereo_MS_to_LR(
+    stereo_dec_state            *state,                         /* I/O  State                                       */
+    opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
+    opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
+    const opus_int32            pred_Q13[],                     /* I    Predictors                                  */
+    opus_int                    fs_kHz,                         /* I    Samples rate (kHz)                          */
+    opus_int                    frame_length                    /* I    Number of samples                           */
+);
+
+/* Find least-squares prediction gain for one signal based on another and quantize it */
+opus_int32 silk_stereo_find_predictor(                          /* O    Returns predictor in Q13                    */
+    opus_int32                  *ratio_Q14,                     /* O    Ratio of residual and mid energies          */
+    const opus_int16            x[],                            /* I    Basis signal                                */
+    const opus_int16            y[],                            /* I    Target signal                               */
+    opus_int32                  mid_res_amp_Q0[],               /* I/O  Smoothed mid, residual norms                */
+    opus_int                    length,                         /* I    Number of samples                           */
+    opus_int                    smooth_coef_Q16                 /* I    Smoothing coefficient                       */
+);
+
+/* Quantize mid/side predictors */
+void silk_stereo_quant_pred(
+    opus_int32                  pred_Q13[],                     /* I/O  Predictors (out: quantized)                 */
+    opus_int8                   ix[ 2 ][ 3 ]                    /* O    Quantization indices                        */
+);
+
+/* Entropy code the mid/side quantization indices */
+void silk_stereo_encode_pred(
+    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
+    opus_int8                   ix[ 2 ][ 3 ]                    /* I    Quantization indices                        */
+);
+
+/* Entropy code the mid-only flag */
+void silk_stereo_encode_mid_only(
+    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
+    opus_int8                   mid_only_flag
+);
+
+/* Decode mid/side predictors */
+void silk_stereo_decode_pred(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int32                  pred_Q13[]                      /* O    Predictors                                  */
+);
+
+/* Decode mid-only flag */
+void silk_stereo_decode_mid_only(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    *decode_only_mid                /* O    Flag that only mid channel has been coded   */
+);
+
+/* Encodes signs of excitation */
+void silk_encode_signs(
+    ec_enc                      *psRangeEnc,                        /* I/O  Compressor data structure                   */
+    const opus_int8             pulses[],                           /* I    pulse signal                                */
+    opus_int                    length,                             /* I    length of input                             */
+    const opus_int              signalType,                         /* I    Signal type                                 */
+    const opus_int              quantOffsetType,                    /* I    Quantization offset type                    */
+    const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
+);
+
+/* Decodes signs of excitation */
+void silk_decode_signs(
+    ec_dec                      *psRangeDec,                        /* I/O  Compressor data structure                   */
+    opus_int                    pulses[],                           /* I/O  pulse signal                                */
+    opus_int                    length,                             /* I    length of input                             */
+    const opus_int              signalType,                         /* I    Signal type                                 */
+    const opus_int              quantOffsetType,                    /* I    Quantization offset type                    */
+    const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
+);
+
+/* Check encoder control struct */
+opus_int check_control_input(
+    silk_EncControlStruct        *encControl                    /* I    Control structure                           */
+);
+
+/* Control internal sampling rate */
+opus_int silk_control_audio_bandwidth(
+    silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
+    silk_EncControlStruct       *encControl                     /* I    Control structure                           */
+);
+
+/* Control SNR of redidual quantizer */
+opus_int silk_control_SNR(
+    silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
+    opus_int32                  TargetRate_bps                  /* I    Target max bitrate (bps)                    */
+);
+
+/***************/
+/* Shell coder */
+/***************/
+
+/* Encode quantization indices of excitation */
+void silk_encode_pulses(
+    ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
+    const opus_int              signalType,                     /* I    Signal type                                 */
+    const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
+    opus_int8                   pulses[],                       /* I    quantization indices                        */
+    const opus_int              frame_length                    /* I    Frame length                                */
+);
+
+/* Shell encoder, operates on one shell code frame of 16 pulses */
+void silk_shell_encoder(
+    ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
+    const opus_int              *pulses0                        /* I    data: nonnegative pulse amplitudes          */
+);
+
+/* Shell decoder, operates on one shell code frame of 16 pulses */
+void silk_shell_decoder(
+    opus_int                    *pulses0,                       /* O    data: nonnegative pulse amplitudes          */
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    const opus_int              pulses4                         /* I    number of pulses per pulse-subframe         */
+);
+
+/* Gain scalar quantization with hysteresis, uniform on log scale */
+void silk_gains_quant(
+    opus_int8                   ind[ MAX_NB_SUBFR ],            /* O    gain indices                                */
+    opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* I/O  gains (quantized out)                       */
+    opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
+    const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
+    const opus_int              nb_subfr                        /* I    number of subframes                         */
+);
+
+/* Gains scalar dequantization, uniform on log scale */
+void silk_gains_dequant(
+    opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* O    quantized gains                             */
+    const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
+    opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
+    const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
+    const opus_int              nb_subfr                        /* I    number of subframes                          */
+);
+
+/* Compute unique identifier of gain indices vector */
+opus_int32 silk_gains_ID(                                       /* O    returns unique identifier of gains          */
+    const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
+    const opus_int              nb_subfr                        /* I    number of subframes                         */
+);
+
+/* Interpolate two vectors */
+void silk_interpolate(
+    opus_int16                  xi[ MAX_LPC_ORDER ],            /* O    interpolated vector                         */
+    const opus_int16            x0[ MAX_LPC_ORDER ],            /* I    first vector                                */
+    const opus_int16            x1[ MAX_LPC_ORDER ],            /* I    second vector                               */
+    const opus_int              ifact_Q2,                       /* I    interp. factor, weight on 2nd vector        */
+    const opus_int              d                               /* I    number of parameters                        */
+);
+
+/* LTP tap quantizer */
+void silk_quant_LTP_gains(
+    opus_int16                  B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],          /* I/O  (un)quantized LTP gains         */
+    opus_int8                   cbk_index[ MAX_NB_SUBFR ],                  /* O    Codebook Index                  */
+    opus_int8                   *periodicity_index,                         /* O    Periodicity Index               */
+	opus_int32					*sum_gain_dB_Q7,							/* I/O  Cumulative max prediction gain  */
+    const opus_int32            W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ],  /* I    Error Weights in Q18            */
+    opus_int                    mu_Q9,                                      /* I    Mu value (R/D tradeoff)         */
+    opus_int                    lowComplexity,                              /* I    Flag for low complexity         */
+    const opus_int              nb_subfr                                    /* I    number of subframes             */
+);
+
+/* Entropy constrained matrix-weighted VQ, for a single input data vector */
+void silk_VQ_WMat_EC(
+    opus_int8                   *ind,                           /* O    index of best codebook vector               */
+    opus_int32                  *rate_dist_Q14,                 /* O    best weighted quant error + mu * rate       */
+    opus_int                    *gain_Q7,                       /* O    sum of absolute LTP coefficients            */
+    const opus_int16            *in_Q14,                        /* I    input vector to be quantized                */
+    const opus_int32            *W_Q18,                         /* I    weighting matrix                            */
+    const opus_int8             *cb_Q7,                         /* I    codebook                                    */
+    const opus_uint8            *cb_gain_Q7,                    /* I    codebook effective gain                     */
+    const opus_uint8            *cl_Q5,                         /* I    code length for each codebook vector        */
+    const opus_int              mu_Q9,                          /* I    tradeoff betw. weighted error and rate      */
+    const opus_int32            max_gain_Q7,                    /* I    maximum sum of absolute LTP coefficients    */
+    opus_int                    L                               /* I    number of vectors in codebook               */
+);
+
+/************************************/
+/* Noise shaping quantization (NSQ) */
+/************************************/
+void silk_NSQ(
+    const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
+    silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
+    SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
+    const opus_int32            x_Q3[],                                     /* I    Prefiltered input signal        */
+    opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
+    const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
+    const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
+    const opus_int16            AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs             */
+    const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
+    const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
+    const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
+    const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
+    const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
+    const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
+    const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
+);
+
+/* Noise shaping using delayed decision */
+void silk_NSQ_del_dec(
+    const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
+    silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
+    SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
+    const opus_int32            x_Q3[],                                     /* I    Prefiltered input signal        */
+    opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
+    const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
+    const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
+    const opus_int16            AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs             */
+    const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
+    const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
+    const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
+    const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
+    const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
+    const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
+    const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
+);
+
+/************/
+/* Silk VAD */
+/************/
+/* Initialize the Silk VAD */
+opus_int silk_VAD_Init(                                         /* O    Return value, 0 if success                  */
+    silk_VAD_state              *psSilk_VAD                     /* I/O  Pointer to Silk VAD state                   */
+);
+
+/* Get speech activity level in Q8 */
+opus_int silk_VAD_GetSA_Q8(                                     /* O    Return value, 0 if success                  */
+    silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
+    const opus_int16            pIn[]                           /* I    PCM input                                   */
+);
+
+/* Low-pass filter with variable cutoff frequency based on  */
+/* piece-wise linear interpolation between elliptic filters */
+/* Start by setting transition_frame_no = 1;                */
+void silk_LP_variable_cutoff(
+    silk_LP_state               *psLP,                          /* I/O  LP filter state                             */
+    opus_int16                  *frame,                         /* I/O  Low-pass filtered output signal             */
+    const opus_int              frame_length                    /* I    Frame length                                */
+);
+
+/******************/
+/* NLSF Quantizer */
+/******************/
+/* Limit, stabilize, convert and quantize NLSFs */
+void silk_process_NLSFs(
+    silk_encoder_state          *psEncC,                            /* I/O  Encoder state                               */
+    opus_int16                  PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O    Prediction coefficients                     */
+    opus_int16                  pNLSF_Q15[         MAX_LPC_ORDER ], /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
+    const opus_int16            prev_NLSFq_Q15[    MAX_LPC_ORDER ]  /* I    Previous Normalized LSFs (0 - (2^15-1))     */
+);
+
+opus_int32 silk_NLSF_encode(                                    /* O    Returns RD value in Q25                     */
+          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
+          opus_int16            *pNLSF_Q15,                     /* I/O  Quantized NLSF vector [ LPC_ORDER ]         */
+    const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
+    const opus_int16            *pW_QW,                         /* I    NLSF weight vector [ LPC_ORDER ]            */
+    const opus_int              NLSF_mu_Q20,                    /* I    Rate weight for the RD optimization         */
+    const opus_int              nSurvivors,                     /* I    Max survivors after first stage             */
+    const opus_int              signalType                      /* I    Signal type: 0/1/2                          */
+);
+
+/* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
+void silk_NLSF_VQ(
+    opus_int32                  err_Q26[],                      /* O    Quantization errors [K]                     */
+    const opus_int16            in_Q15[],                       /* I    Input vectors to be quantized [LPC_order]   */
+    const opus_uint8            pCB_Q8[],                       /* I    Codebook vectors [K*LPC_order]              */
+    const opus_int              K,                              /* I    Number of codebook vectors                  */
+    const opus_int              LPC_order                       /* I    Number of LPCs                              */
+);
+
+/* Delayed-decision quantizer for NLSF residuals */
+opus_int32 silk_NLSF_del_dec_quant(                             /* O    Returns RD value in Q25                     */
+    opus_int8                   indices[],                      /* O    Quantization indices [ order ]              */
+    const opus_int16            x_Q10[],                        /* I    Input [ order ]                             */
+    const opus_int16            w_Q5[],                         /* I    Weights [ order ]                           */
+    const opus_uint8            pred_coef_Q8[],                 /* I    Backward predictor coefs [ order ]          */
+    const opus_int16            ec_ix[],                        /* I    Indices to entropy coding tables [ order ]  */
+    const opus_uint8            ec_rates_Q5[],                  /* I    Rates []                                    */
+    const opus_int              quant_step_size_Q16,            /* I    Quantization step size                      */
+    const opus_int16            inv_quant_step_size_Q6,         /* I    Inverse quantization step size              */
+    const opus_int32            mu_Q20,                         /* I    R/D tradeoff                                */
+    const opus_int16            order                           /* I    Number of input values                      */
+);
+
+/* Unpack predictor values and indices for entropy coding tables */
+void silk_NLSF_unpack(
+          opus_int16            ec_ix[],                        /* O    Indices to entropy tables [ LPC_ORDER ]     */
+          opus_uint8            pred_Q8[],                      /* O    LSF predictor [ LPC_ORDER ]                 */
+    const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
+    const opus_int              CB1_index                       /* I    Index of vector in first LSF codebook       */
+);
+
+/***********************/
+/* NLSF vector decoder */
+/***********************/
+void silk_NLSF_decode(
+          opus_int16            *pNLSF_Q15,                     /* O    Quantized NLSF vector [ LPC_ORDER ]         */
+          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
+    const silk_NLSF_CB_struct   *psNLSF_CB                      /* I    Codebook object                             */
+);
+
+/****************************************************/
+/* Decoder Functions                                */
+/****************************************************/
+opus_int silk_init_decoder(
+    silk_decoder_state          *psDec                          /* I/O  Decoder state pointer                       */
+);
+
+/* Set decoder sampling rate */
+opus_int silk_decoder_set_fs(
+    silk_decoder_state          *psDec,                         /* I/O  Decoder state pointer                       */
+    opus_int                    fs_kHz,                         /* I    Sampling frequency (kHz)                    */
+    opus_int32                  fs_API_Hz                       /* I    API Sampling frequency (Hz)                 */
+);
+
+/****************/
+/* Decode frame */
+/****************/
+opus_int silk_decode_frame(
+    silk_decoder_state          *psDec,                         /* I/O  Pointer to Silk decoder state               */
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int16                  pOut[],                         /* O    Pointer to output speech frame              */
+    opus_int32                  *pN,                            /* O    Pointer to size of output frame             */
+    opus_int                    lostFlag,                       /* I    0: no loss, 1 loss, 2 decode fec            */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+);
+
+/* Decode indices from bitstream */
+void silk_decode_indices(
+    silk_decoder_state          *psDec,                         /* I/O  State                                       */
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    FrameIndex,                     /* I    Frame number                                */
+    opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+);
+
+/* Decode parameters from payload */
+void silk_decode_parameters(
+    silk_decoder_state          *psDec,                         /* I/O  State                                       */
+    silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+);
+
+/* Core decoder. Performs inverse NSQ operation LTP + LPC */
+void silk_decode_core(
+    silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
+    silk_decoder_control        *psDecCtrl,                     /* I    Decoder control                             */
+    opus_int16                  xq[],                           /* O    Decoded speech                              */
+    const opus_int              pulses[ MAX_FRAME_LENGTH ]      /* I    Pulse signal                                */
+);
+
+/* Decode quantization indices of excitation (Shell coding) */
+void silk_decode_pulses(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    pulses[],                       /* O    Excitation signal                           */
+    const opus_int              signalType,                     /* I    Sigtype                                     */
+    const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
+    const opus_int              frame_length                    /* I    Frame length                                */
+);
+
+/******************/
+/* CNG */
+/******************/
+
+/* Reset CNG */
+void silk_CNG_Reset(
+    silk_decoder_state          *psDec                          /* I/O  Decoder state                               */
+);
+
+/* Updates CNG estimate, and applies the CNG when packet was lost */
+void silk_CNG(
+    silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
+    silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
+    opus_int16                  frame[],                        /* I/O  Signal                                      */
+    opus_int                    length                          /* I    Length of residual                          */
+);
+
+/* Encoding of various parameters */
+void silk_encode_indices(
+    silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
+    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
+    opus_int                    FrameIndex,                     /* I    Frame number                                */
+    opus_int                    encode_LBRR,                    /* I    Flag indicating LBRR data is being encoded  */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+);
+
+#endif
diff --git a/drivers/opus/silk/sort.c b/drivers/opus/silk/sort.c
new file mode 100644
index 0000000000..5e9ba08616
--- /dev/null
+++ b/drivers/opus/silk/sort.c
@@ -0,0 +1,154 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+/* Insertion sort (fast for already almost sorted arrays):   */
+/* Best case:  O(n)   for an already sorted array            */
+/* Worst case: O(n^2) for an inversely sorted array          */
+/*                                                           */
+/* Shell short:    http://en.wikipedia.org/wiki/Shell_sort   */
+
+#include "SigProc_FIX.h"
+
+void silk_insertion_sort_increasing(
+    opus_int32           *a,             /* I/O   Unsorted / Sorted vector               */
+    opus_int             *idx,           /* O     Index vector for the sorted elements   */
+    const opus_int       L,              /* I     Vector length                          */
+    const opus_int       K               /* I     Number of correctly sorted positions   */
+)
+{
+    opus_int32    value;
+    opus_int        i, j;
+
+    /* Safety checks */
+    silk_assert( K >  0 );
+    silk_assert( L >  0 );
+    silk_assert( L >= K );
+
+    /* Write start indices in index vector */
+    for( i = 0; i < K; i++ ) {
+        idx[ i ] = i;
+    }
+
+    /* Sort vector elements by value, increasing order */
+    for( i = 1; i < K; i++ ) {
+        value = a[ i ];
+        for( j = i - 1; ( j >= 0 ) && ( value < a[ j ] ); j-- ) {
+            a[ j + 1 ]   = a[ j ];       /* Shift value */
+            idx[ j + 1 ] = idx[ j ];     /* Shift index */
+        }
+        a[ j + 1 ]   = value;   /* Write value */
+        idx[ j + 1 ] = i;       /* Write index */
+    }
+
+    /* If less than L values are asked for, check the remaining values, */
+    /* but only spend CPU to ensure that the K first values are correct */
+    for( i = K; i < L; i++ ) {
+        value = a[ i ];
+        if( value < a[ K - 1 ] ) {
+            for( j = K - 2; ( j >= 0 ) && ( value < a[ j ] ); j-- ) {
+                a[ j + 1 ]   = a[ j ];       /* Shift value */
+                idx[ j + 1 ] = idx[ j ];     /* Shift index */
+            }
+            a[ j + 1 ]   = value;   /* Write value */
+            idx[ j + 1 ] = i;       /* Write index */
+        }
+    }
+}
+
+#ifdef OPUS_FIXED_POINT
+/* This function is only used by the fixed-point build */
+void silk_insertion_sort_decreasing_int16(
+    opus_int16                  *a,                 /* I/O   Unsorted / Sorted vector                                   */
+    opus_int                    *idx,               /* O     Index vector for the sorted elements                       */
+    const opus_int              L,                  /* I     Vector length                                              */
+    const opus_int              K                   /* I     Number of correctly sorted positions                       */
+)
+{
+    opus_int i, j;
+    opus_int value;
+
+    /* Safety checks */
+    silk_assert( K >  0 );
+    silk_assert( L >  0 );
+    silk_assert( L >= K );
+
+    /* Write start indices in index vector */
+    for( i = 0; i < K; i++ ) {
+        idx[ i ] = i;
+    }
+
+    /* Sort vector elements by value, decreasing order */
+    for( i = 1; i < K; i++ ) {
+        value = a[ i ];
+        for( j = i - 1; ( j >= 0 ) && ( value > a[ j ] ); j-- ) {
+            a[ j + 1 ]   = a[ j ];     /* Shift value */
+            idx[ j + 1 ] = idx[ j ];   /* Shift index */
+        }
+        a[ j + 1 ]   = value;   /* Write value */
+        idx[ j + 1 ] = i;       /* Write index */
+    }
+
+    /* If less than L values are asked for, check the remaining values, */
+    /* but only spend CPU to ensure that the K first values are correct */
+    for( i = K; i < L; i++ ) {
+        value = a[ i ];
+        if( value > a[ K - 1 ] ) {
+            for( j = K - 2; ( j >= 0 ) && ( value > a[ j ] ); j-- ) {
+                a[ j + 1 ]   = a[ j ];     /* Shift value */
+                idx[ j + 1 ] = idx[ j ];   /* Shift index */
+            }
+            a[ j + 1 ]   = value;   /* Write value */
+            idx[ j + 1 ] = i;       /* Write index */
+        }
+    }
+}
+#endif
+
+void silk_insertion_sort_increasing_all_values_int16(
+     opus_int16                 *a,                 /* I/O   Unsorted / Sorted vector                                   */
+     const opus_int             L                   /* I     Vector length                                              */
+)
+{
+    opus_int    value;
+    opus_int    i, j;
+
+    /* Safety checks */
+    silk_assert( L >  0 );
+
+    /* Sort vector elements by value, increasing order */
+    for( i = 1; i < L; i++ ) {
+        value = a[ i ];
+        for( j = i - 1; ( j >= 0 ) && ( value < a[ j ] ); j-- ) {
+            a[ j + 1 ] = a[ j ]; /* Shift value */
+        }
+        a[ j + 1 ] = value; /* Write value */
+    }
+}
diff --git a/drivers/opus/silk/stereo_LR_to_MS.c b/drivers/opus/silk/stereo_LR_to_MS.c
new file mode 100644
index 0000000000..678f46984b
--- /dev/null
+++ b/drivers/opus/silk/stereo_LR_to_MS.c
@@ -0,0 +1,229 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+#include "stack_alloc.h"
+
+/* Convert Left/Right stereo signal to adaptive Mid/Side representation */
+void silk_stereo_LR_to_MS(
+    stereo_enc_state            *state,                         /* I/O  State                                       */
+    opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
+    opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
+    opus_int8                   ix[ 2 ][ 3 ],                   /* O    Quantization indices                        */
+    opus_int8                   *mid_only_flag,                 /* O    Flag: only mid signal coded                 */
+    opus_int32                  mid_side_rates_bps[],           /* O    Bitrates for mid and side signals           */
+    opus_int32                  total_rate_bps,                 /* I    Total bitrate                               */
+    opus_int                    prev_speech_act_Q8,             /* I    Speech activity level in previous frame     */
+    opus_int                    toMono,                         /* I    Last frame before a stereo->mono transition */
+    opus_int                    fs_kHz,                         /* I    Sample rate (kHz)                           */
+    opus_int                    frame_length                    /* I    Number of samples                           */
+)
+{
+    opus_int   n, is10msFrame, denom_Q16, delta0_Q13, delta1_Q13;
+    opus_int32 sum, diff, smooth_coef_Q16, pred_Q13[ 2 ], pred0_Q13, pred1_Q13;
+    opus_int32 LP_ratio_Q14, HP_ratio_Q14, frac_Q16, frac_3_Q16, min_mid_rate_bps, width_Q14, w_Q24, deltaw_Q24;
+    VARDECL( opus_int16, side );
+    VARDECL( opus_int16, LP_mid );
+    VARDECL( opus_int16, HP_mid );
+    VARDECL( opus_int16, LP_side );
+    VARDECL( opus_int16, HP_side );
+    opus_int16 *mid = &x1[ -2 ];
+    SAVE_STACK;
+
+    ALLOC( side, frame_length + 2, opus_int16 );
+    /* Convert to basic mid/side signals */
+    for( n = 0; n < frame_length + 2; n++ ) {
+        sum  = x1[ n - 2 ] + (opus_int32)x2[ n - 2 ];
+        diff = x1[ n - 2 ] - (opus_int32)x2[ n - 2 ];
+        mid[  n ] = (opus_int16)silk_RSHIFT_ROUND( sum, 1 );
+        side[ n ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( diff, 1 ) );
+    }
+
+    /* Buffering */
+    silk_memcpy( mid,  state->sMid,  2 * sizeof( opus_int16 ) );
+    silk_memcpy( side, state->sSide, 2 * sizeof( opus_int16 ) );
+    silk_memcpy( state->sMid,  &mid[  frame_length ], 2 * sizeof( opus_int16 ) );
+    silk_memcpy( state->sSide, &side[ frame_length ], 2 * sizeof( opus_int16 ) );
+
+    /* LP and HP filter mid signal */
+    ALLOC( LP_mid, frame_length, opus_int16 );
+    ALLOC( HP_mid, frame_length, opus_int16 );
+    for( n = 0; n < frame_length; n++ ) {
+        sum = silk_RSHIFT_ROUND( silk_ADD_LSHIFT( mid[ n ] + mid[ n + 2 ], mid[ n + 1 ], 1 ), 2 );
+        LP_mid[ n ] = sum;
+        HP_mid[ n ] = mid[ n + 1 ] - sum;
+    }
+
+    /* LP and HP filter side signal */
+    ALLOC( LP_side, frame_length, opus_int16 );
+    ALLOC( HP_side, frame_length, opus_int16 );
+    for( n = 0; n < frame_length; n++ ) {
+        sum = silk_RSHIFT_ROUND( silk_ADD_LSHIFT( side[ n ] + side[ n + 2 ], side[ n + 1 ], 1 ), 2 );
+        LP_side[ n ] = sum;
+        HP_side[ n ] = side[ n + 1 ] - sum;
+    }
+
+    /* Find energies and predictors */
+    is10msFrame = frame_length == 10 * fs_kHz;
+    smooth_coef_Q16 = is10msFrame ?
+        SILK_FIX_CONST( STEREO_RATIO_SMOOTH_COEF / 2, 16 ) :
+        SILK_FIX_CONST( STEREO_RATIO_SMOOTH_COEF,     16 );
+    smooth_coef_Q16 = silk_SMULWB( silk_SMULBB( prev_speech_act_Q8, prev_speech_act_Q8 ), smooth_coef_Q16 );
+
+    pred_Q13[ 0 ] = silk_stereo_find_predictor( &LP_ratio_Q14, LP_mid, LP_side, &state->mid_side_amp_Q0[ 0 ], frame_length, smooth_coef_Q16 );
+    pred_Q13[ 1 ] = silk_stereo_find_predictor( &HP_ratio_Q14, HP_mid, HP_side, &state->mid_side_amp_Q0[ 2 ], frame_length, smooth_coef_Q16 );
+    /* Ratio of the norms of residual and mid signals */
+    frac_Q16 = silk_SMLABB( HP_ratio_Q14, LP_ratio_Q14, 3 );
+    frac_Q16 = silk_min( frac_Q16, SILK_FIX_CONST( 1, 16 ) );
+
+    /* Determine bitrate distribution between mid and side, and possibly reduce stereo width */
+    total_rate_bps -= is10msFrame ? 1200 : 600;      /* Subtract approximate bitrate for coding stereo parameters */
+    if( total_rate_bps < 1 ) {
+        total_rate_bps = 1;
+    }
+    min_mid_rate_bps = silk_SMLABB( 2000, fs_kHz, 900 );
+    silk_assert( min_mid_rate_bps < 32767 );
+    /* Default bitrate distribution: 8 parts for Mid and (5+3*frac) parts for Side. so: mid_rate = ( 8 / ( 13 + 3 * frac ) ) * total_ rate */
+    frac_3_Q16 = silk_MUL( 3, frac_Q16 );
+    mid_side_rates_bps[ 0 ] = silk_DIV32_varQ( total_rate_bps, SILK_FIX_CONST( 8 + 5, 16 ) + frac_3_Q16, 16+3 );
+    /* If Mid bitrate below minimum, reduce stereo width */
+    if( mid_side_rates_bps[ 0 ] < min_mid_rate_bps ) {
+        mid_side_rates_bps[ 0 ] = min_mid_rate_bps;
+        mid_side_rates_bps[ 1 ] = total_rate_bps - mid_side_rates_bps[ 0 ];
+        /* width = 4 * ( 2 * side_rate - min_rate ) / ( ( 1 + 3 * frac ) * min_rate ) */
+        width_Q14 = silk_DIV32_varQ( silk_LSHIFT( mid_side_rates_bps[ 1 ], 1 ) - min_mid_rate_bps,
+            silk_SMULWB( SILK_FIX_CONST( 1, 16 ) + frac_3_Q16, min_mid_rate_bps ), 14+2 );
+        width_Q14 = silk_LIMIT( width_Q14, 0, SILK_FIX_CONST( 1, 14 ) );
+    } else {
+        mid_side_rates_bps[ 1 ] = total_rate_bps - mid_side_rates_bps[ 0 ];
+        width_Q14 = SILK_FIX_CONST( 1, 14 );
+    }
+
+    /* Smoother */
+    state->smth_width_Q14 = (opus_int16)silk_SMLAWB( state->smth_width_Q14, width_Q14 - state->smth_width_Q14, smooth_coef_Q16 );
+
+    /* At very low bitrates or for inputs that are nearly amplitude panned, switch to panned-mono coding */
+    *mid_only_flag = 0;
+    if( toMono ) {
+        /* Last frame before stereo->mono transition; collapse stereo width */
+        width_Q14 = 0;
+        pred_Q13[ 0 ] = 0;
+        pred_Q13[ 1 ] = 0;
+        silk_stereo_quant_pred( pred_Q13, ix );
+    } else if( state->width_prev_Q14 == 0 &&
+        ( 8 * total_rate_bps < 13 * min_mid_rate_bps || silk_SMULWB( frac_Q16, state->smth_width_Q14 ) < SILK_FIX_CONST( 0.05, 14 ) ) )
+    {
+        /* Code as panned-mono; previous frame already had zero width */
+        /* Scale down and quantize predictors */
+        pred_Q13[ 0 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 0 ] ), 14 );
+        pred_Q13[ 1 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 1 ] ), 14 );
+        silk_stereo_quant_pred( pred_Q13, ix );
+        /* Collapse stereo width */
+        width_Q14 = 0;
+        pred_Q13[ 0 ] = 0;
+        pred_Q13[ 1 ] = 0;
+        mid_side_rates_bps[ 0 ] = total_rate_bps;
+        mid_side_rates_bps[ 1 ] = 0;
+        *mid_only_flag = 1;
+    } else if( state->width_prev_Q14 != 0 &&
+        ( 8 * total_rate_bps < 11 * min_mid_rate_bps || silk_SMULWB( frac_Q16, state->smth_width_Q14 ) < SILK_FIX_CONST( 0.02, 14 ) ) )
+    {
+        /* Transition to zero-width stereo */
+        /* Scale down and quantize predictors */
+        pred_Q13[ 0 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 0 ] ), 14 );
+        pred_Q13[ 1 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 1 ] ), 14 );
+        silk_stereo_quant_pred( pred_Q13, ix );
+        /* Collapse stereo width */
+        width_Q14 = 0;
+        pred_Q13[ 0 ] = 0;
+        pred_Q13[ 1 ] = 0;
+    } else if( state->smth_width_Q14 > SILK_FIX_CONST( 0.95, 14 ) ) {
+        /* Full-width stereo coding */
+        silk_stereo_quant_pred( pred_Q13, ix );
+        width_Q14 = SILK_FIX_CONST( 1, 14 );
+    } else {
+        /* Reduced-width stereo coding; scale down and quantize predictors */
+        pred_Q13[ 0 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 0 ] ), 14 );
+        pred_Q13[ 1 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 1 ] ), 14 );
+        silk_stereo_quant_pred( pred_Q13, ix );
+        width_Q14 = state->smth_width_Q14;
+    }
+
+    /* Make sure to keep on encoding until the tapered output has been transmitted */
+    if( *mid_only_flag == 1 ) {
+        state->silent_side_len += frame_length - STEREO_INTERP_LEN_MS * fs_kHz;
+        if( state->silent_side_len < LA_SHAPE_MS * fs_kHz ) {
+            *mid_only_flag = 0;
+        } else {
+            /* Limit to avoid wrapping around */
+            state->silent_side_len = 10000;
+        }
+    } else {
+        state->silent_side_len = 0;
+    }
+
+    if( *mid_only_flag == 0 && mid_side_rates_bps[ 1 ] < 1 ) {
+        mid_side_rates_bps[ 1 ] = 1;
+        mid_side_rates_bps[ 0 ] = silk_max_int( 1, total_rate_bps - mid_side_rates_bps[ 1 ]);
+    }
+
+    /* Interpolate predictors and subtract prediction from side channel */
+    pred0_Q13  = -state->pred_prev_Q13[ 0 ];
+    pred1_Q13  = -state->pred_prev_Q13[ 1 ];
+    w_Q24      =  silk_LSHIFT( state->width_prev_Q14, 10 );
+    denom_Q16  = silk_DIV32_16( (opus_int32)1 << 16, STEREO_INTERP_LEN_MS * fs_kHz );
+    delta0_Q13 = -silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 0 ] - state->pred_prev_Q13[ 0 ], denom_Q16 ), 16 );
+    delta1_Q13 = -silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 1 ] - state->pred_prev_Q13[ 1 ], denom_Q16 ), 16 );
+    deltaw_Q24 =  silk_LSHIFT( silk_SMULWB( width_Q14 - state->width_prev_Q14, denom_Q16 ), 10 );
+    for( n = 0; n < STEREO_INTERP_LEN_MS * fs_kHz; n++ ) {
+        pred0_Q13 += delta0_Q13;
+        pred1_Q13 += delta1_Q13;
+        w_Q24   += deltaw_Q24;
+        sum = silk_LSHIFT( silk_ADD_LSHIFT( mid[ n ] + mid[ n + 2 ], mid[ n + 1 ], 1 ), 9 );    /* Q11 */
+        sum = silk_SMLAWB( silk_SMULWB( w_Q24, side[ n + 1 ] ), sum, pred0_Q13 );               /* Q8  */
+        sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)mid[ n + 1 ], 11 ), pred1_Q13 );       /* Q8  */
+        x2[ n - 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) );
+    }
+
+    pred0_Q13 = -pred_Q13[ 0 ];
+    pred1_Q13 = -pred_Q13[ 1 ];
+    w_Q24     =  silk_LSHIFT( width_Q14, 10 );
+    for( n = STEREO_INTERP_LEN_MS * fs_kHz; n < frame_length; n++ ) {
+        sum = silk_LSHIFT( silk_ADD_LSHIFT( mid[ n ] + mid[ n + 2 ], mid[ n + 1 ], 1 ), 9 );    /* Q11 */
+        sum = silk_SMLAWB( silk_SMULWB( w_Q24, side[ n + 1 ] ), sum, pred0_Q13 );               /* Q8  */
+        sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)mid[ n + 1 ], 11 ), pred1_Q13 );       /* Q8  */
+        x2[ n - 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) );
+    }
+    state->pred_prev_Q13[ 0 ] = (opus_int16)pred_Q13[ 0 ];
+    state->pred_prev_Q13[ 1 ] = (opus_int16)pred_Q13[ 1 ];
+    state->width_prev_Q14     = (opus_int16)width_Q14;
+    RESTORE_STACK;
+}
diff --git a/drivers/opus/silk/stereo_MS_to_LR.c b/drivers/opus/silk/stereo_MS_to_LR.c
new file mode 100644
index 0000000000..34f43cf795
--- /dev/null
+++ b/drivers/opus/silk/stereo_MS_to_LR.c
@@ -0,0 +1,85 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Convert adaptive Mid/Side representation to Left/Right stereo signal */
+void silk_stereo_MS_to_LR(
+    stereo_dec_state            *state,                         /* I/O  State                                       */
+    opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
+    opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
+    const opus_int32            pred_Q13[],                     /* I    Predictors                                  */
+    opus_int                    fs_kHz,                         /* I    Samples rate (kHz)                          */
+    opus_int                    frame_length                    /* I    Number of samples                           */
+)
+{
+    opus_int   n, denom_Q16, delta0_Q13, delta1_Q13;
+    opus_int32 sum, diff, pred0_Q13, pred1_Q13;
+
+    /* Buffering */
+    silk_memcpy( x1, state->sMid,  2 * sizeof( opus_int16 ) );
+    silk_memcpy( x2, state->sSide, 2 * sizeof( opus_int16 ) );
+    silk_memcpy( state->sMid,  &x1[ frame_length ], 2 * sizeof( opus_int16 ) );
+    silk_memcpy( state->sSide, &x2[ frame_length ], 2 * sizeof( opus_int16 ) );
+
+    /* Interpolate predictors and add prediction to side channel */
+    pred0_Q13  = state->pred_prev_Q13[ 0 ];
+    pred1_Q13  = state->pred_prev_Q13[ 1 ];
+    denom_Q16  = silk_DIV32_16( (opus_int32)1 << 16, STEREO_INTERP_LEN_MS * fs_kHz );
+    delta0_Q13 = silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 0 ] - state->pred_prev_Q13[ 0 ], denom_Q16 ), 16 );
+    delta1_Q13 = silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 1 ] - state->pred_prev_Q13[ 1 ], denom_Q16 ), 16 );
+    for( n = 0; n < STEREO_INTERP_LEN_MS * fs_kHz; n++ ) {
+        pred0_Q13 += delta0_Q13;
+        pred1_Q13 += delta1_Q13;
+        sum = silk_LSHIFT( silk_ADD_LSHIFT( x1[ n ] + x1[ n + 2 ], x1[ n + 1 ], 1 ), 9 );       /* Q11 */
+        sum = silk_SMLAWB( silk_LSHIFT( (opus_int32)x2[ n + 1 ], 8 ), sum, pred0_Q13 );         /* Q8  */
+        sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)x1[ n + 1 ], 11 ), pred1_Q13 );        /* Q8  */
+        x2[ n + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) );
+    }
+    pred0_Q13 = pred_Q13[ 0 ];
+    pred1_Q13 = pred_Q13[ 1 ];
+    for( n = STEREO_INTERP_LEN_MS * fs_kHz; n < frame_length; n++ ) {
+        sum = silk_LSHIFT( silk_ADD_LSHIFT( x1[ n ] + x1[ n + 2 ], x1[ n + 1 ], 1 ), 9 );       /* Q11 */
+        sum = silk_SMLAWB( silk_LSHIFT( (opus_int32)x2[ n + 1 ], 8 ), sum, pred0_Q13 );         /* Q8  */
+        sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)x1[ n + 1 ], 11 ), pred1_Q13 );        /* Q8  */
+        x2[ n + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) );
+    }
+    state->pred_prev_Q13[ 0 ] = pred_Q13[ 0 ];
+    state->pred_prev_Q13[ 1 ] = pred_Q13[ 1 ];
+
+    /* Convert to left/right signals */
+    for( n = 0; n < frame_length; n++ ) {
+        sum  = x1[ n + 1 ] + (opus_int32)x2[ n + 1 ];
+        diff = x1[ n + 1 ] - (opus_int32)x2[ n + 1 ];
+        x1[ n + 1 ] = (opus_int16)silk_SAT16( sum );
+        x2[ n + 1 ] = (opus_int16)silk_SAT16( diff );
+    }
+}
diff --git a/drivers/opus/silk/stereo_decode_pred.c b/drivers/opus/silk/stereo_decode_pred.c
new file mode 100644
index 0000000000..56d94e56fe
--- /dev/null
+++ b/drivers/opus/silk/stereo_decode_pred.c
@@ -0,0 +1,73 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Decode mid/side predictors */
+void silk_stereo_decode_pred(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int32                  pred_Q13[]                      /* O    Predictors                                  */
+)
+{
+    opus_int   n, ix[ 2 ][ 3 ];
+    opus_int32 low_Q13, step_Q13;
+
+    /* Entropy decoding */
+    n = ec_dec_icdf( psRangeDec, silk_stereo_pred_joint_iCDF, 8 );
+    ix[ 0 ][ 2 ] = silk_DIV32_16( n, 5 );
+    ix[ 1 ][ 2 ] = n - 5 * ix[ 0 ][ 2 ];
+    for( n = 0; n < 2; n++ ) {
+        ix[ n ][ 0 ] = ec_dec_icdf( psRangeDec, silk_uniform3_iCDF, 8 );
+        ix[ n ][ 1 ] = ec_dec_icdf( psRangeDec, silk_uniform5_iCDF, 8 );
+    }
+
+    /* Dequantize */
+    for( n = 0; n < 2; n++ ) {
+        ix[ n ][ 0 ] += 3 * ix[ n ][ 2 ];
+        low_Q13 = silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] ];
+        step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] + 1 ] - low_Q13,
+            SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) );
+        pred_Q13[ n ] = silk_SMLABB( low_Q13, step_Q13, 2 * ix[ n ][ 1 ] + 1 );
+    }
+
+    /* Subtract second from first predictor (helps when actually applying these) */
+    pred_Q13[ 0 ] -= pred_Q13[ 1 ];
+}
+
+/* Decode mid-only flag */
+void silk_stereo_decode_mid_only(
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    *decode_only_mid                /* O    Flag that only mid channel has been coded   */
+)
+{
+    /* Decode flag that only mid channel is coded */
+    *decode_only_mid = ec_dec_icdf( psRangeDec, silk_stereo_only_code_mid_iCDF, 8 );
+}
diff --git a/drivers/opus/silk/stereo_encode_pred.c b/drivers/opus/silk/stereo_encode_pred.c
new file mode 100644
index 0000000000..bfe75b08e4
--- /dev/null
+++ b/drivers/opus/silk/stereo_encode_pred.c
@@ -0,0 +1,62 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Entropy code the mid/side quantization indices */
+void silk_stereo_encode_pred(
+    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
+    opus_int8                   ix[ 2 ][ 3 ]                    /* I    Quantization indices                        */
+)
+{
+    opus_int   n;
+
+    /* Entropy coding */
+    n = 5 * ix[ 0 ][ 2 ] + ix[ 1 ][ 2 ];
+    silk_assert( n < 25 );
+    ec_enc_icdf( psRangeEnc, n, silk_stereo_pred_joint_iCDF, 8 );
+    for( n = 0; n < 2; n++ ) {
+        silk_assert( ix[ n ][ 0 ] < 3 );
+        silk_assert( ix[ n ][ 1 ] < STEREO_QUANT_SUB_STEPS );
+        ec_enc_icdf( psRangeEnc, ix[ n ][ 0 ], silk_uniform3_iCDF, 8 );
+        ec_enc_icdf( psRangeEnc, ix[ n ][ 1 ], silk_uniform5_iCDF, 8 );
+    }
+}
+
+/* Entropy code the mid-only flag */
+void silk_stereo_encode_mid_only(
+    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
+    opus_int8                   mid_only_flag
+)
+{
+    /* Encode flag that only mid channel is coded */
+    ec_enc_icdf( psRangeEnc, mid_only_flag, silk_stereo_only_code_mid_iCDF, 8 );
+}
diff --git a/drivers/opus/silk/stereo_find_predictor.c b/drivers/opus/silk/stereo_find_predictor.c
new file mode 100644
index 0000000000..266293dff3
--- /dev/null
+++ b/drivers/opus/silk/stereo_find_predictor.c
@@ -0,0 +1,79 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Find least-squares prediction gain for one signal based on another and quantize it */
+opus_int32 silk_stereo_find_predictor(                          /* O    Returns predictor in Q13                    */
+    opus_int32                  *ratio_Q14,                     /* O    Ratio of residual and mid energies          */
+    const opus_int16            x[],                            /* I    Basis signal                                */
+    const opus_int16            y[],                            /* I    Target signal                               */
+    opus_int32                  mid_res_amp_Q0[],               /* I/O  Smoothed mid, residual norms                */
+    opus_int                    length,                         /* I    Number of samples                           */
+    opus_int                    smooth_coef_Q16                 /* I    Smoothing coefficient                       */
+)
+{
+    opus_int   scale, scale1, scale2;
+    opus_int32 nrgx, nrgy, corr, pred_Q13, pred2_Q10;
+
+    /* Find  predictor */
+    silk_sum_sqr_shift( &nrgx, &scale1, x, length );
+    silk_sum_sqr_shift( &nrgy, &scale2, y, length );
+    scale = silk_max_int( scale1, scale2 );
+    scale = scale + ( scale & 1 );          /* make even */
+    nrgy = silk_RSHIFT32( nrgy, scale - scale2 );
+    nrgx = silk_RSHIFT32( nrgx, scale - scale1 );
+    nrgx = silk_max_int( nrgx, 1 );
+    corr = silk_inner_prod_aligned_scale( x, y, scale, length );
+    pred_Q13 = silk_DIV32_varQ( corr, nrgx, 13 );
+    pred_Q13 = silk_LIMIT( pred_Q13, -(1 << 14), 1 << 14 );
+    pred2_Q10 = silk_SMULWB( pred_Q13, pred_Q13 );
+
+    /* Faster update for signals with large prediction parameters */
+    smooth_coef_Q16 = (opus_int)silk_max_int( smooth_coef_Q16, silk_abs( pred2_Q10 ) );
+
+    /* Smoothed mid and residual norms */
+    silk_assert( smooth_coef_Q16 < 32768 );
+    scale = silk_RSHIFT( scale, 1 );
+    mid_res_amp_Q0[ 0 ] = silk_SMLAWB( mid_res_amp_Q0[ 0 ], silk_LSHIFT( silk_SQRT_APPROX( nrgx ), scale ) - mid_res_amp_Q0[ 0 ],
+        smooth_coef_Q16 );
+    /* Residual energy = nrgy - 2 * pred * corr + pred^2 * nrgx */
+    nrgy = silk_SUB_LSHIFT32( nrgy, silk_SMULWB( corr, pred_Q13 ), 3 + 1 );
+    nrgy = silk_ADD_LSHIFT32( nrgy, silk_SMULWB( nrgx, pred2_Q10 ), 6 );
+    mid_res_amp_Q0[ 1 ] = silk_SMLAWB( mid_res_amp_Q0[ 1 ], silk_LSHIFT( silk_SQRT_APPROX( nrgy ), scale ) - mid_res_amp_Q0[ 1 ],
+        smooth_coef_Q16 );
+
+    /* Ratio of smoothed residual and mid norms */
+    *ratio_Q14 = silk_DIV32_varQ( mid_res_amp_Q0[ 1 ], silk_max( mid_res_amp_Q0[ 0 ], 1 ), 14 );
+    *ratio_Q14 = silk_LIMIT( *ratio_Q14, 0, 32767 );
+
+    return pred_Q13;
+}
diff --git a/drivers/opus/silk/stereo_quant_pred.c b/drivers/opus/silk/stereo_quant_pred.c
new file mode 100644
index 0000000000..834020d715
--- /dev/null
+++ b/drivers/opus/silk/stereo_quant_pred.c
@@ -0,0 +1,73 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "silk_main.h"
+
+/* Quantize mid/side predictors */
+void silk_stereo_quant_pred(
+    opus_int32                  pred_Q13[],                     /* I/O  Predictors (out: quantized)                 */
+    opus_int8                   ix[ 2 ][ 3 ]                    /* O    Quantization indices                        */
+)
+{
+    opus_int   i, j, n;
+    opus_int32 low_Q13, step_Q13, lvl_Q13, err_min_Q13, err_Q13, quant_pred_Q13 = 0;
+
+    /* Quantize */
+    for( n = 0; n < 2; n++ ) {
+        /* Brute-force search over quantization levels */
+        err_min_Q13 = silk_int32_MAX;
+        for( i = 0; i < STEREO_QUANT_TAB_SIZE - 1; i++ ) {
+            low_Q13 = silk_stereo_pred_quant_Q13[ i ];
+            step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ i + 1 ] - low_Q13,
+                SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) );
+            for( j = 0; j < STEREO_QUANT_SUB_STEPS; j++ ) {
+                lvl_Q13 = silk_SMLABB( low_Q13, step_Q13, 2 * j + 1 );
+                err_Q13 = silk_abs( pred_Q13[ n ] - lvl_Q13 );
+                if( err_Q13 < err_min_Q13 ) {
+                    err_min_Q13 = err_Q13;
+                    quant_pred_Q13 = lvl_Q13;
+                    ix[ n ][ 0 ] = i;
+                    ix[ n ][ 1 ] = j;
+                } else {
+                    /* Error increasing, so we're past the optimum */
+                    goto done;
+                }
+            }
+        }
+        done:
+        ix[ n ][ 2 ]  = silk_DIV32_16( ix[ n ][ 0 ], 3 );
+        ix[ n ][ 0 ] -= ix[ n ][ 2 ] * 3;
+        pred_Q13[ n ] = quant_pred_Q13;
+    }
+
+    /* Subtract second from first predictor (helps when actually applying these) */
+    pred_Q13[ 0 ] -= pred_Q13[ 1 ];
+}
diff --git a/drivers/opus/silk/structs.h b/drivers/opus/silk/structs.h
new file mode 100644
index 0000000000..1826b36a80
--- /dev/null
+++ b/drivers/opus/silk/structs.h
@@ -0,0 +1,327 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_STRUCTS_H
+#define SILK_STRUCTS_H
+
+#include "typedef.h"
+#include "SigProc_FIX.h"
+#include "define.h"
+#include "entenc.h"
+#include "entdec.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/************************************/
+/* Noise shaping quantization state */
+/************************************/
+typedef struct {
+    opus_int16                  xq[           2 * MAX_FRAME_LENGTH ]; /* Buffer for quantized output signal                             */
+    opus_int32                  sLTP_shp_Q14[ 2 * MAX_FRAME_LENGTH ];
+    opus_int32                  sLPC_Q14[ MAX_SUB_FRAME_LENGTH + NSQ_LPC_BUF_LENGTH ];
+    opus_int32                  sAR2_Q14[ MAX_SHAPE_LPC_ORDER ];
+    opus_int32                  sLF_AR_shp_Q14;
+    opus_int                    lagPrev;
+    opus_int                    sLTP_buf_idx;
+    opus_int                    sLTP_shp_buf_idx;
+    opus_int32                  rand_seed;
+    opus_int32                  prev_gain_Q16;
+    opus_int                    rewhite_flag;
+} silk_nsq_state;
+
+/********************************/
+/* VAD state                    */
+/********************************/
+typedef struct {
+    opus_int32                  AnaState[ 2 ];                  /* Analysis filterbank state: 0-8 kHz                                   */
+    opus_int32                  AnaState1[ 2 ];                 /* Analysis filterbank state: 0-4 kHz                                   */
+    opus_int32                  AnaState2[ 2 ];                 /* Analysis filterbank state: 0-2 kHz                                   */
+    opus_int32                  XnrgSubfr[ VAD_N_BANDS ];       /* Subframe energies                                                    */
+    opus_int32                  NrgRatioSmth_Q8[ VAD_N_BANDS ]; /* Smoothed energy level in each band                                   */
+    opus_int16                  HPstate;                        /* State of differentiator in the lowest band                           */
+    opus_int32                  NL[ VAD_N_BANDS ];              /* Noise energy level in each band                                      */
+    opus_int32                  inv_NL[ VAD_N_BANDS ];          /* Inverse noise energy level in each band                              */
+    opus_int32                  NoiseLevelBias[ VAD_N_BANDS ];  /* Noise level estimator bias/offset                                    */
+    opus_int32                  counter;                        /* Frame counter used in the initial phase                              */
+} silk_VAD_state;
+
+/* Variable cut-off low-pass filter state */
+typedef struct {
+    opus_int32                   In_LP_State[ 2 ];           /* Low pass filter state */
+    opus_int32                   transition_frame_no;        /* Counter which is mapped to a cut-off frequency */
+    opus_int                     mode;                       /* Operating mode, <0: switch down, >0: switch up; 0: do nothing           */
+} silk_LP_state;
+
+/* Structure containing NLSF codebook */
+typedef struct {
+    const opus_int16             nVectors;
+    const opus_int16             order;
+    const opus_int16             quantStepSize_Q16;
+    const opus_int16             invQuantStepSize_Q6;
+    const opus_uint8             *CB1_NLSF_Q8;
+    const opus_uint8             *CB1_iCDF;
+    const opus_uint8             *pred_Q8;
+    const opus_uint8             *ec_sel;
+    const opus_uint8             *ec_iCDF;
+    const opus_uint8             *ec_Rates_Q5;
+    const opus_int16             *deltaMin_Q15;
+} silk_NLSF_CB_struct;
+
+typedef struct {
+    opus_int16                   pred_prev_Q13[ 2 ];
+    opus_int16                   sMid[ 2 ];
+    opus_int16                   sSide[ 2 ];
+    opus_int32                   mid_side_amp_Q0[ 4 ];
+    opus_int16                   smth_width_Q14;
+    opus_int16                   width_prev_Q14;
+    opus_int16                   silent_side_len;
+    opus_int8                    predIx[ MAX_FRAMES_PER_PACKET ][ 2 ][ 3 ];
+    opus_int8                    mid_only_flags[ MAX_FRAMES_PER_PACKET ];
+} stereo_enc_state;
+
+typedef struct {
+    opus_int16                   pred_prev_Q13[ 2 ];
+    opus_int16                   sMid[ 2 ];
+    opus_int16                   sSide[ 2 ];
+} stereo_dec_state;
+
+typedef struct {
+    opus_int8                    GainsIndices[ MAX_NB_SUBFR ];
+    opus_int8                    LTPIndex[ MAX_NB_SUBFR ];
+    opus_int8                    NLSFIndices[ MAX_LPC_ORDER + 1 ];
+    opus_int16                   lagIndex;
+    opus_int8                    contourIndex;
+    opus_int8                    signalType;
+    opus_int8                    quantOffsetType;
+    opus_int8                    NLSFInterpCoef_Q2;
+    opus_int8                    PERIndex;
+    opus_int8                    LTP_scaleIndex;
+    opus_int8                    Seed;
+} SideInfoIndices;
+
+/********************************/
+/* Encoder state                */
+/********************************/
+typedef struct {
+    opus_int32                   In_HP_State[ 2 ];                  /* High pass filter state                                           */
+    opus_int32                   variable_HP_smth1_Q15;             /* State of first smoother                                          */
+    opus_int32                   variable_HP_smth2_Q15;             /* State of second smoother                                         */
+    silk_LP_state                sLP;                               /* Low pass filter state                                            */
+    silk_VAD_state               sVAD;                              /* Voice activity detector state                                    */
+    silk_nsq_state               sNSQ;                              /* Noise Shape Quantizer State                                      */
+    opus_int16                   prev_NLSFq_Q15[ MAX_LPC_ORDER ];   /* Previously quantized NLSF vector                                 */
+    opus_int                     speech_activity_Q8;                /* Speech activity                                                  */
+    opus_int                     allow_bandwidth_switch;            /* Flag indicating that switching of internal bandwidth is allowed  */
+    opus_int8                    LBRRprevLastGainIndex;
+    opus_int8                    prevSignalType;
+    opus_int                     prevLag;
+    opus_int                     pitch_LPC_win_length;
+    opus_int                     max_pitch_lag;                     /* Highest possible pitch lag (samples)                             */
+    opus_int32                   API_fs_Hz;                         /* API sampling frequency (Hz)                                      */
+    opus_int32                   prev_API_fs_Hz;                    /* Previous API sampling frequency (Hz)                             */
+    opus_int                     maxInternal_fs_Hz;                 /* Maximum internal sampling frequency (Hz)                         */
+    opus_int                     minInternal_fs_Hz;                 /* Minimum internal sampling frequency (Hz)                         */
+    opus_int                     desiredInternal_fs_Hz;             /* Soft request for internal sampling frequency (Hz)                */
+    opus_int                     fs_kHz;                            /* Internal sampling frequency (kHz)                                */
+    opus_int                     nb_subfr;                          /* Number of 5 ms subframes in a frame                              */
+    opus_int                     frame_length;                      /* Frame length (samples)                                           */
+    opus_int                     subfr_length;                      /* Subframe length (samples)                                        */
+    opus_int                     ltp_mem_length;                    /* Length of LTP memory                                             */
+    opus_int                     la_pitch;                          /* Look-ahead for pitch analysis (samples)                          */
+    opus_int                     la_shape;                          /* Look-ahead for noise shape analysis (samples)                    */
+    opus_int                     shapeWinLength;                    /* Window length for noise shape analysis (samples)                 */
+    opus_int32                   TargetRate_bps;                    /* Target bitrate (bps)                                             */
+    opus_int                     PacketSize_ms;                     /* Number of milliseconds to put in each packet                     */
+    opus_int                     PacketLoss_perc;                   /* Packet loss rate measured by farend                              */
+    opus_int32                   frameCounter;
+    opus_int                     Complexity;                        /* Complexity setting                                               */
+    opus_int                     nStatesDelayedDecision;            /* Number of states in delayed decision quantization                */
+    opus_int                     useInterpolatedNLSFs;              /* Flag for using NLSF interpolation                                */
+    opus_int                     shapingLPCOrder;                   /* Filter order for noise shaping filters                           */
+    opus_int                     predictLPCOrder;                   /* Filter order for prediction filters                              */
+    opus_int                     pitchEstimationComplexity;         /* Complexity level for pitch estimator                             */
+    opus_int                     pitchEstimationLPCOrder;           /* Whitening filter order for pitch estimator                       */
+    opus_int32                   pitchEstimationThreshold_Q16;      /* Threshold for pitch estimator                                    */
+    opus_int                     LTPQuantLowComplexity;             /* Flag for low complexity LTP quantization                         */
+    opus_int                     mu_LTP_Q9;                         /* Rate-distortion tradeoff in LTP quantization                     */
+    opus_int32                   sum_log_gain_Q7;					/* Cumulative max prediction gain									*/
+    opus_int                     NLSF_MSVQ_Survivors;               /* Number of survivors in NLSF MSVQ                                 */
+    opus_int                     first_frame_after_reset;           /* Flag for deactivating NLSF interpolation, pitch prediction       */
+    opus_int                     controlled_since_last_payload;     /* Flag for ensuring codec_control only runs once per packet        */
+    opus_int                     warping_Q16;                       /* Warping parameter for warped noise shaping                       */
+    opus_int                     useCBR;                            /* Flag to enable constant bitrate                                  */
+    opus_int                     prefillFlag;                       /* Flag to indicate that only buffers are prefilled, no coding      */
+    const opus_uint8             *pitch_lag_low_bits_iCDF;          /* Pointer to iCDF table for low bits of pitch lag index            */
+    const opus_uint8             *pitch_contour_iCDF;               /* Pointer to iCDF table for pitch contour index                    */
+    const silk_NLSF_CB_struct    *psNLSF_CB;                        /* Pointer to NLSF codebook                                         */
+    opus_int                     input_quality_bands_Q15[ VAD_N_BANDS ];
+    opus_int                     input_tilt_Q15;
+    opus_int                     SNR_dB_Q7;                         /* Quality setting                                                  */
+
+    opus_int8                    VAD_flags[ MAX_FRAMES_PER_PACKET ];
+    opus_int8                    LBRR_flag;
+    opus_int                     LBRR_flags[ MAX_FRAMES_PER_PACKET ];
+
+    SideInfoIndices              indices;
+    opus_int8                    pulses[ MAX_FRAME_LENGTH ];
+
+    int                          arch;
+
+    /* Input/output buffering */
+    opus_int16                   inputBuf[ MAX_FRAME_LENGTH + 2 ];  /* Buffer containing input signal                                   */
+    opus_int                     inputBufIx;
+    opus_int                     nFramesPerPacket;
+    opus_int                     nFramesEncoded;                    /* Number of frames analyzed in current packet                      */
+
+    opus_int                     nChannelsAPI;
+    opus_int                     nChannelsInternal;
+    opus_int                     channelNb;
+
+    /* Parameters For LTP scaling Control */
+    opus_int                     frames_since_onset;
+
+    /* Specifically for entropy coding */
+    opus_int                     ec_prevSignalType;
+    opus_int16                   ec_prevLagIndex;
+
+    silk_resampler_state_struct resampler_state;
+
+    /* DTX */
+    opus_int                     useDTX;                            /* Flag to enable DTX                                               */
+    opus_int                     inDTX;                             /* Flag to signal DTX period                                        */
+    opus_int                     noSpeechCounter;                   /* Counts concecutive nonactive frames, used by DTX                 */
+
+    /* Inband Low Bitrate Redundancy (LBRR) data */
+    opus_int                     useInBandFEC;                      /* Saves the API setting for query                                  */
+    opus_int                     LBRR_enabled;                      /* Depends on useInBandFRC, bitrate and packet loss rate            */
+    opus_int                     LBRR_GainIncreases;                /* Gains increment for coding LBRR frames                           */
+    SideInfoIndices              indices_LBRR[ MAX_FRAMES_PER_PACKET ];
+    opus_int8                    pulses_LBRR[ MAX_FRAMES_PER_PACKET ][ MAX_FRAME_LENGTH ];
+} silk_encoder_state;
+
+
+/* Struct for Packet Loss Concealment */
+typedef struct {
+    opus_int32                  pitchL_Q8;                          /* Pitch lag to use for voiced concealment                          */
+    opus_int16                  LTPCoef_Q14[ LTP_ORDER ];           /* LTP coeficients to use for voiced concealment                    */
+    opus_int16                  prevLPC_Q12[ MAX_LPC_ORDER ];
+    opus_int                    last_frame_lost;                    /* Was previous frame lost                                          */
+    opus_int32                  rand_seed;                          /* Seed for unvoiced signal generation                              */
+    opus_int16                  randScale_Q14;                      /* Scaling of unvoiced random signal                                */
+    opus_int32                  conc_energy;
+    opus_int                    conc_energy_shift;
+    opus_int16                  prevLTP_scale_Q14;
+    opus_int32                  prevGain_Q16[ 2 ];
+    opus_int                    fs_kHz;
+    opus_int                    nb_subfr;
+    opus_int                    subfr_length;
+} silk_PLC_struct;
+
+/* Struct for CNG */
+typedef struct {
+    opus_int32                  CNG_exc_buf_Q14[ MAX_FRAME_LENGTH ];
+    opus_int16                  CNG_smth_NLSF_Q15[ MAX_LPC_ORDER ];
+    opus_int32                  CNG_synth_state[ MAX_LPC_ORDER ];
+    opus_int32                  CNG_smth_Gain_Q16;
+    opus_int32                  rand_seed;
+    opus_int                    fs_kHz;
+} silk_CNG_struct;
+
+/********************************/
+/* Decoder state                */
+/********************************/
+typedef struct {
+    opus_int32                  prev_gain_Q16;
+    opus_int32                  exc_Q14[ MAX_FRAME_LENGTH ];
+    opus_int32                  sLPC_Q14_buf[ MAX_LPC_ORDER ];
+    opus_int16                  outBuf[ MAX_FRAME_LENGTH + 2 * MAX_SUB_FRAME_LENGTH ];  /* Buffer for output signal                     */
+    opus_int                    lagPrev;                            /* Previous Lag                                                     */
+    opus_int8                   LastGainIndex;                      /* Previous gain index                                              */
+    opus_int                    fs_kHz;                             /* Sampling frequency in kHz                                        */
+    opus_int32                  fs_API_hz;                          /* API sample frequency (Hz)                                        */
+    opus_int                    nb_subfr;                           /* Number of 5 ms subframes in a frame                              */
+    opus_int                    frame_length;                       /* Frame length (samples)                                           */
+    opus_int                    subfr_length;                       /* Subframe length (samples)                                        */
+    opus_int                    ltp_mem_length;                     /* Length of LTP memory                                             */
+    opus_int                    LPC_order;                          /* LPC order                                                        */
+    opus_int16                  prevNLSF_Q15[ MAX_LPC_ORDER ];      /* Used to interpolate LSFs                                         */
+    opus_int                    first_frame_after_reset;            /* Flag for deactivating NLSF interpolation                         */
+    const opus_uint8            *pitch_lag_low_bits_iCDF;           /* Pointer to iCDF table for low bits of pitch lag index            */
+    const opus_uint8            *pitch_contour_iCDF;                /* Pointer to iCDF table for pitch contour index                    */
+
+    /* For buffering payload in case of more frames per packet */
+    opus_int                    nFramesDecoded;
+    opus_int                    nFramesPerPacket;
+
+    /* Specifically for entropy coding */
+    opus_int                    ec_prevSignalType;
+    opus_int16                  ec_prevLagIndex;
+
+    opus_int                    VAD_flags[ MAX_FRAMES_PER_PACKET ];
+    opus_int                    LBRR_flag;
+    opus_int                    LBRR_flags[ MAX_FRAMES_PER_PACKET ];
+
+    silk_resampler_state_struct resampler_state;
+
+    const silk_NLSF_CB_struct   *psNLSF_CB;                         /* Pointer to NLSF codebook                                         */
+
+    /* Quantization indices */
+    SideInfoIndices             indices;
+
+    /* CNG state */
+    silk_CNG_struct             sCNG;
+
+    /* Stuff used for PLC */
+    opus_int                    lossCnt;
+    opus_int                    prevSignalType;
+
+    silk_PLC_struct sPLC;
+
+} silk_decoder_state;
+
+/************************/
+/* Decoder control      */
+/************************/
+typedef struct {
+    /* Prediction and coding parameters */
+    opus_int                    pitchL[ MAX_NB_SUBFR ];
+    opus_int32                  Gains_Q16[ MAX_NB_SUBFR ];
+    /* Holds interpolated and final coefficients, 4-byte aligned */
+    silk_DWORD_ALIGN opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ];
+    opus_int16                  LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ];
+    opus_int                    LTP_scale_Q14;
+} silk_decoder_control;
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/sum_sqr_shift.c b/drivers/opus/silk/sum_sqr_shift.c
new file mode 100644
index 0000000000..8ec27f8a03
--- /dev/null
+++ b/drivers/opus/silk/sum_sqr_shift.c
@@ -0,0 +1,85 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "SigProc_FIX.h"
+
+/* Compute number of bits to right shift the sum of squares of a vector */
+/* of int16s to make it fit in an int32                                 */
+void silk_sum_sqr_shift(
+    opus_int32                  *energy,            /* O   Energy of x, after shifting to the right                     */
+    opus_int                    *shift,             /* O   Number of bits right shift applied to energy                 */
+    const opus_int16            *x,                 /* I   Input vector                                                 */
+    opus_int                    len                 /* I   Length of input vector                                       */
+)
+{
+    opus_int   i, shft;
+    opus_int32 nrg_tmp, nrg;
+
+    nrg  = 0;
+    shft = 0;
+    len--;
+    for( i = 0; i < len; i += 2 ) {
+        nrg = silk_SMLABB_ovflw( nrg, x[ i ], x[ i ] );
+        nrg = silk_SMLABB_ovflw( nrg, x[ i + 1 ], x[ i + 1 ] );
+        if( nrg < 0 ) {
+            /* Scale down */
+            nrg = (opus_int32)silk_RSHIFT_uint( (opus_uint32)nrg, 2 );
+            shft = 2;
+            break;
+        }
+    }
+    for( ; i < len; i += 2 ) {
+        nrg_tmp = silk_SMULBB( x[ i ], x[ i ] );
+        nrg_tmp = silk_SMLABB_ovflw( nrg_tmp, x[ i + 1 ], x[ i + 1 ] );
+        nrg = (opus_int32)silk_ADD_RSHIFT_uint( nrg, (opus_uint32)nrg_tmp, shft );
+        if( nrg < 0 ) {
+            /* Scale down */
+            nrg = (opus_int32)silk_RSHIFT_uint( (opus_uint32)nrg, 2 );
+            shft += 2;
+        }
+    }
+    if( i == len ) {
+        /* One sample left to process */
+        nrg_tmp = silk_SMULBB( x[ i ], x[ i ] );
+        nrg = (opus_int32)silk_ADD_RSHIFT_uint( nrg, nrg_tmp, shft );
+    }
+
+    /* Make sure to have at least one extra leading zero (two leading zeros in total) */
+    if( nrg & 0xC0000000 ) {
+        nrg = silk_RSHIFT_uint( (opus_uint32)nrg, 2 );
+        shft += 2;
+    }
+
+    /* Output arguments */
+    *shift  = shft;
+    *energy = nrg;
+}
+
diff --git a/drivers/opus/silk/table_LSF_cos.c b/drivers/opus/silk/table_LSF_cos.c
new file mode 100644
index 0000000000..674b6a03e6
--- /dev/null
+++ b/drivers/opus/silk/table_LSF_cos.c
@@ -0,0 +1,70 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "tables.h"
+
+/* Cosine approximation table for LSF conversion */
+/* Q12 values (even) */
+const opus_int16 silk_LSFCosTab_FIX_Q12[ LSF_COS_TAB_SZ_FIX + 1 ] = {
+            8192,             8190,             8182,             8170,
+            8152,             8130,             8104,             8072,
+            8034,             7994,             7946,             7896,
+            7840,             7778,             7714,             7644,
+            7568,             7490,             7406,             7318,
+            7226,             7128,             7026,             6922,
+            6812,             6698,             6580,             6458,
+            6332,             6204,             6070,             5934,
+            5792,             5648,             5502,             5352,
+            5198,             5040,             4880,             4718,
+            4552,             4382,             4212,             4038,
+            3862,             3684,             3502,             3320,
+            3136,             2948,             2760,             2570,
+            2378,             2186,             1990,             1794,
+            1598,             1400,             1202,             1002,
+             802,              602,              402,              202,
+               0,             -202,             -402,             -602,
+            -802,            -1002,            -1202,            -1400,
+           -1598,            -1794,            -1990,            -2186,
+           -2378,            -2570,            -2760,            -2948,
+           -3136,            -3320,            -3502,            -3684,
+           -3862,            -4038,            -4212,            -4382,
+           -4552,            -4718,            -4880,            -5040,
+           -5198,            -5352,            -5502,            -5648,
+           -5792,            -5934,            -6070,            -6204,
+           -6332,            -6458,            -6580,            -6698,
+           -6812,            -6922,            -7026,            -7128,
+           -7226,            -7318,            -7406,            -7490,
+           -7568,            -7644,            -7714,            -7778,
+           -7840,            -7896,            -7946,            -7994,
+           -8034,            -8072,            -8104,            -8130,
+           -8152,            -8170,            -8182,            -8190,
+           -8192
+};
diff --git a/drivers/opus/silk/tables.h b/drivers/opus/silk/tables.h
new file mode 100644
index 0000000000..a91431e854
--- /dev/null
+++ b/drivers/opus/silk/tables.h
@@ -0,0 +1,122 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_TABLES_H
+#define SILK_TABLES_H
+
+#include "define.h"
+#include "structs.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* Entropy coding tables (with size in bytes indicated) */
+extern const opus_uint8  silk_gain_iCDF[ 3 ][ N_LEVELS_QGAIN / 8 ];                                 /* 24 */
+extern const opus_uint8  silk_delta_gain_iCDF[ MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 ];   /* 41 */
+
+extern const opus_uint8  silk_pitch_lag_iCDF[ 2 * ( PITCH_EST_MAX_LAG_MS - PITCH_EST_MIN_LAG_MS ) ];/* 32 */
+extern const opus_uint8  silk_pitch_delta_iCDF[ 21 ];                                               /*  21 */
+extern const opus_uint8  silk_pitch_contour_iCDF[ 34 ];                                             /*  34 */
+extern const opus_uint8  silk_pitch_contour_NB_iCDF[ 11 ];                                          /*  11 */
+extern const opus_uint8  silk_pitch_contour_10_ms_iCDF[ 12 ];                                       /*  12 */
+extern const opus_uint8  silk_pitch_contour_10_ms_NB_iCDF[ 3 ];                                     /*   3 */
+
+extern const opus_uint8  silk_pulses_per_block_iCDF[ N_RATE_LEVELS ][ MAX_PULSES + 2 ];             /* 180 */
+extern const opus_uint8  silk_pulses_per_block_BITS_Q5[ N_RATE_LEVELS - 1 ][ MAX_PULSES + 2 ];      /* 162 */
+
+extern const opus_uint8  silk_rate_levels_iCDF[ 2 ][ N_RATE_LEVELS - 1 ];                           /*  18 */
+extern const opus_uint8  silk_rate_levels_BITS_Q5[ 2 ][ N_RATE_LEVELS - 1 ];                        /*  18 */
+
+extern const opus_uint8  silk_max_pulses_table[ 4 ];                                                /*   4 */
+
+extern const opus_uint8  silk_shell_code_table0[ 152 ];                                             /* 152 */
+extern const opus_uint8  silk_shell_code_table1[ 152 ];                                             /* 152 */
+extern const opus_uint8  silk_shell_code_table2[ 152 ];                                             /* 152 */
+extern const opus_uint8  silk_shell_code_table3[ 152 ];                                             /* 152 */
+extern const opus_uint8  silk_shell_code_table_offsets[ MAX_PULSES + 1 ];                           /*  17 */
+
+extern const opus_uint8  silk_lsb_iCDF[ 2 ];                                                        /*   2 */
+
+extern const opus_uint8  silk_sign_iCDF[ 42 ];                                                      /*  42 */
+
+extern const opus_uint8  silk_uniform3_iCDF[ 3 ];                                                   /*   3 */
+extern const opus_uint8  silk_uniform4_iCDF[ 4 ];                                                   /*   4 */
+extern const opus_uint8  silk_uniform5_iCDF[ 5 ];                                                   /*   5 */
+extern const opus_uint8  silk_uniform6_iCDF[ 6 ];                                                   /*   6 */
+extern const opus_uint8  silk_uniform8_iCDF[ 8 ];                                                   /*   8 */
+
+extern const opus_uint8  silk_NLSF_EXT_iCDF[ 7 ];                                                   /*   7 */
+
+extern const opus_uint8  silk_LTP_per_index_iCDF[ 3 ];                                              /*   3 */
+extern const opus_uint8  * const silk_LTP_gain_iCDF_ptrs[ NB_LTP_CBKS ];                            /*   3 */
+extern const opus_uint8  * const silk_LTP_gain_BITS_Q5_ptrs[ NB_LTP_CBKS ];                         /*   3 */
+extern const opus_int16  silk_LTP_gain_middle_avg_RD_Q14;
+extern const opus_int8   * const silk_LTP_vq_ptrs_Q7[ NB_LTP_CBKS ];                                /* 168 */
+extern const opus_uint8  * const silk_LTP_vq_gain_ptrs_Q7[NB_LTP_CBKS];
+
+extern const opus_int8   silk_LTP_vq_sizes[ NB_LTP_CBKS ];                                          /*   3 */
+
+extern const opus_uint8  silk_LTPscale_iCDF[ 3 ];                                                   /*   4 */
+extern const opus_int16  silk_LTPScales_table_Q14[ 3 ];                                             /*   6 */
+
+extern const opus_uint8  silk_type_offset_VAD_iCDF[ 4 ];                                            /*   4 */
+extern const opus_uint8  silk_type_offset_no_VAD_iCDF[ 2 ];                                         /*   2 */
+
+extern const opus_int16  silk_stereo_pred_quant_Q13[ STEREO_QUANT_TAB_SIZE ];                       /*  32 */
+extern const opus_uint8  silk_stereo_pred_joint_iCDF[ 25 ];                                         /*  25 */
+extern const opus_uint8  silk_stereo_only_code_mid_iCDF[ 2 ];                                       /*   2 */
+
+extern const opus_uint8  * const silk_LBRR_flags_iCDF_ptr[ 2 ];                                     /*  10 */
+
+extern const opus_uint8  silk_NLSF_interpolation_factor_iCDF[ 5 ];                                  /*   5 */
+
+extern const silk_NLSF_CB_struct silk_NLSF_CB_WB;                                                   /* 1040 */
+extern const silk_NLSF_CB_struct silk_NLSF_CB_NB_MB;                                                /* 728 */
+
+/* Piece-wise linear mapping from bitrate in kbps to coding quality in dB SNR */
+extern const opus_int32  silk_TargetRate_table_NB[  TARGET_RATE_TAB_SZ ];                           /*  32 */
+extern const opus_int32  silk_TargetRate_table_MB[  TARGET_RATE_TAB_SZ ];                           /*  32 */
+extern const opus_int32  silk_TargetRate_table_WB[  TARGET_RATE_TAB_SZ ];                           /*  32 */
+extern const opus_int16  silk_SNR_table_Q1[         TARGET_RATE_TAB_SZ ];                           /*  32 */
+
+/* Quantization offsets */
+extern const opus_int16  silk_Quantization_Offsets_Q10[ 2 ][ 2 ];                                   /*   8 */
+
+/* Interpolation points for filter coefficients used in the bandwidth transition smoother */
+extern const opus_int32  silk_Transition_LP_B_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NB ];           /*  60 */
+extern const opus_int32  silk_Transition_LP_A_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NA ];           /*  60 */
+
+/* Rom table with cosine values */
+extern const opus_int16  silk_LSFCosTab_FIX_Q12[ LSF_COS_TAB_SZ_FIX + 1 ];                          /* 258 */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/drivers/opus/silk/tables_LTP.c b/drivers/opus/silk/tables_LTP.c
new file mode 100644
index 0000000000..56b672db8b
--- /dev/null
+++ b/drivers/opus/silk/tables_LTP.c
@@ -0,0 +1,296 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "tables.h"
+
+const opus_uint8 silk_LTP_per_index_iCDF[3] = {
+       179,     99,      0
+};
+
+static const opus_uint8 silk_LTP_gain_iCDF_0[8] = {
+        71,     56,     43,     30,     21,     12,      6,      0
+};
+
+static const opus_uint8 silk_LTP_gain_iCDF_1[16] = {
+       199,    165,    144,    124,    109,     96,     84,     71,
+        61,     51,     42,     32,     23,     15,      8,      0
+};
+
+static const opus_uint8 silk_LTP_gain_iCDF_2[32] = {
+       241,    225,    211,    199,    187,    175,    164,    153,
+       142,    132,    123,    114,    105,     96,     88,     80,
+        72,     64,     57,     50,     44,     38,     33,     29,
+        24,     20,     16,     12,      9,      5,      2,      0
+};
+
+const opus_int16 silk_LTP_gain_middle_avg_RD_Q14 = 12304;
+
+static const opus_uint8 silk_LTP_gain_BITS_Q5_0[8] = {
+        15,    131,    138,    138,    155,    155,    173,    173
+};
+
+static const opus_uint8 silk_LTP_gain_BITS_Q5_1[16] = {
+        69,     93,    115,    118,    131,    138,    141,    138,
+       150,    150,    155,    150,    155,    160,    166,    160
+};
+
+static const opus_uint8 silk_LTP_gain_BITS_Q5_2[32] = {
+       131,    128,    134,    141,    141,    141,    145,    145,
+       145,    150,    155,    155,    155,    155,    160,    160,
+       160,    160,    166,    166,    173,    173,    182,    192,
+       182,    192,    192,    192,    205,    192,    205,    224
+};
+
+const opus_uint8 * const silk_LTP_gain_iCDF_ptrs[NB_LTP_CBKS] = {
+    silk_LTP_gain_iCDF_0,
+    silk_LTP_gain_iCDF_1,
+    silk_LTP_gain_iCDF_2
+};
+
+const opus_uint8 * const silk_LTP_gain_BITS_Q5_ptrs[NB_LTP_CBKS] = {
+    silk_LTP_gain_BITS_Q5_0,
+    silk_LTP_gain_BITS_Q5_1,
+    silk_LTP_gain_BITS_Q5_2
+};
+
+static const opus_int8 silk_LTP_gain_vq_0[8][5] =
+{
+{
+         4,      6,     24,      7,      5
+},
+{
+         0,      0,      2,      0,      0
+},
+{
+        12,     28,     41,     13,     -4
+},
+{
+        -9,     15,     42,     25,     14
+},
+{
+         1,     -2,     62,     41,     -9
+},
+{
+       -10,     37,     65,     -4,      3
+},
+{
+        -6,      4,     66,      7,     -8
+},
+{
+        16,     14,     38,     -3,     33
+}
+};
+
+static const opus_int8 silk_LTP_gain_vq_1[16][5] =
+{
+{
+        13,     22,     39,     23,     12
+},
+{
+        -1,     36,     64,     27,     -6
+},
+{
+        -7,     10,     55,     43,     17
+},
+{
+         1,      1,      8,      1,      1
+},
+{
+         6,    -11,     74,     53,     -9
+},
+{
+       -12,     55,     76,    -12,      8
+},
+{
+        -3,      3,     93,     27,     -4
+},
+{
+        26,     39,     59,      3,     -8
+},
+{
+         2,      0,     77,     11,      9
+},
+{
+        -8,     22,     44,     -6,      7
+},
+{
+        40,      9,     26,      3,      9
+},
+{
+        -7,     20,    101,     -7,      4
+},
+{
+         3,     -8,     42,     26,      0
+},
+{
+       -15,     33,     68,      2,     23
+},
+{
+        -2,     55,     46,     -2,     15
+},
+{
+         3,     -1,     21,     16,     41
+}
+};
+
+static const opus_int8 silk_LTP_gain_vq_2[32][5] =
+{
+{
+        -6,     27,     61,     39,      5
+},
+{
+       -11,     42,     88,      4,      1
+},
+{
+        -2,     60,     65,      6,     -4
+},
+{
+        -1,     -5,     73,     56,      1
+},
+{
+        -9,     19,     94,     29,     -9
+},
+{
+         0,     12,     99,      6,      4
+},
+{
+         8,    -19,    102,     46,    -13
+},
+{
+         3,      2,     13,      3,      2
+},
+{
+         9,    -21,     84,     72,    -18
+},
+{
+       -11,     46,    104,    -22,      8
+},
+{
+        18,     38,     48,     23,      0
+},
+{
+       -16,     70,     83,    -21,     11
+},
+{
+         5,    -11,    117,     22,     -8
+},
+{
+        -6,     23,    117,    -12,      3
+},
+{
+         3,     -8,     95,     28,      4
+},
+{
+       -10,     15,     77,     60,    -15
+},
+{
+        -1,      4,    124,      2,     -4
+},
+{
+         3,     38,     84,     24,    -25
+},
+{
+         2,     13,     42,     13,     31
+},
+{
+        21,     -4,     56,     46,     -1
+},
+{
+        -1,     35,     79,    -13,     19
+},
+{
+        -7,     65,     88,     -9,    -14
+},
+{
+        20,      4,     81,     49,    -29
+},
+{
+        20,      0,     75,      3,    -17
+},
+{
+         5,     -9,     44,     92,     -8
+},
+{
+         1,     -3,     22,     69,     31
+},
+{
+        -6,     95,     41,    -12,      5
+},
+{
+        39,     67,     16,     -4,      1
+},
+{
+         0,     -6,    120,     55,    -36
+},
+{
+       -13,     44,    122,      4,    -24
+},
+{
+        81,      5,     11,      3,      7
+},
+{
+         2,      0,      9,     10,     88
+}
+};
+
+const opus_int8 * const silk_LTP_vq_ptrs_Q7[NB_LTP_CBKS] = {
+    (opus_int8 *)&silk_LTP_gain_vq_0[0][0],
+    (opus_int8 *)&silk_LTP_gain_vq_1[0][0],
+    (opus_int8 *)&silk_LTP_gain_vq_2[0][0]
+};
+
+/* Maximum frequency-dependent response of the pitch taps above,
+   computed as max(abs(freqz(taps))) */
+static const opus_uint8 silk_LTP_gain_vq_0_gain[8] = {
+      46,      2,     90,     87,     93,     91,     82,     98
+};
+
+static const opus_uint8 silk_LTP_gain_vq_1_gain[16] = {
+     109,    120,    118,     12,    113,    115,    117,    119,
+      99,     59,     87,    111,     63,    111,    112,     80
+};
+
+static const opus_uint8 silk_LTP_gain_vq_2_gain[32] = {
+     126,    124,    125,    124,    129,    121,    126,     23,
+     132,    127,    127,    127,    126,    127,    122,    133,
+     130,    134,    101,    118,    119,    145,    126,     86,
+     124,    120,    123,    119,    170,    173,    107,    109
+};
+
+const opus_uint8 * const silk_LTP_vq_gain_ptrs_Q7[NB_LTP_CBKS] = {
+    &silk_LTP_gain_vq_0_gain[0],
+    &silk_LTP_gain_vq_1_gain[0],
+    &silk_LTP_gain_vq_2_gain[0]
+};
+
+const opus_int8 silk_LTP_vq_sizes[NB_LTP_CBKS] = {
+    8, 16, 32
+};
diff --git a/drivers/opus/silk/tables_NLSF_CB_NB_MB.c b/drivers/opus/silk/tables_NLSF_CB_NB_MB.c
new file mode 100644
index 0000000000..ded35eee74
--- /dev/null
+++ b/drivers/opus/silk/tables_NLSF_CB_NB_MB.c
@@ -0,0 +1,159 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "tables.h"
+
+static const opus_uint8 silk_NLSF_CB1_NB_MB_Q8[ 320 ] = {
+        12,     35,     60,     83,    108,    132,    157,    180,
+       206,    228,     15,     32,     55,     77,    101,    125,
+       151,    175,    201,    225,     19,     42,     66,     89,
+       114,    137,    162,    184,    209,    230,     12,     25,
+        50,     72,     97,    120,    147,    172,    200,    223,
+        26,     44,     69,     90,    114,    135,    159,    180,
+       205,    225,     13,     22,     53,     80,    106,    130,
+       156,    180,    205,    228,     15,     25,     44,     64,
+        90,    115,    142,    168,    196,    222,     19,     24,
+        62,     82,    100,    120,    145,    168,    190,    214,
+        22,     31,     50,     79,    103,    120,    151,    170,
+       203,    227,     21,     29,     45,     65,    106,    124,
+       150,    171,    196,    224,     30,     49,     75,     97,
+       121,    142,    165,    186,    209,    229,     19,     25,
+        52,     70,     93,    116,    143,    166,    192,    219,
+        26,     34,     62,     75,     97,    118,    145,    167,
+       194,    217,     25,     33,     56,     70,     91,    113,
+       143,    165,    196,    223,     21,     34,     51,     72,
+        97,    117,    145,    171,    196,    222,     20,     29,
+        50,     67,     90,    117,    144,    168,    197,    221,
+        22,     31,     48,     66,     95,    117,    146,    168,
+       196,    222,     24,     33,     51,     77,    116,    134,
+       158,    180,    200,    224,     21,     28,     70,     87,
+       106,    124,    149,    170,    194,    217,     26,     33,
+        53,     64,     83,    117,    152,    173,    204,    225,
+        27,     34,     65,     95,    108,    129,    155,    174,
+       210,    225,     20,     26,     72,     99,    113,    131,
+       154,    176,    200,    219,     34,     43,     61,     78,
+        93,    114,    155,    177,    205,    229,     23,     29,
+        54,     97,    124,    138,    163,    179,    209,    229,
+        30,     38,     56,     89,    118,    129,    158,    178,
+       200,    231,     21,     29,     49,     63,     85,    111,
+       142,    163,    193,    222,     27,     48,     77,    103,
+       133,    158,    179,    196,    215,    232,     29,     47,
+        74,     99,    124,    151,    176,    198,    220,    237,
+        33,     42,     61,     76,     93,    121,    155,    174,
+       207,    225,     29,     53,     87,    112,    136,    154,
+       170,    188,    208,    227,     24,     30,     52,     84,
+       131,    150,    166,    186,    203,    229,     37,     48,
+        64,     84,    104,    118,    156,    177,    201,    230
+};
+
+static const opus_uint8 silk_NLSF_CB1_iCDF_NB_MB[ 64 ] = {
+       212,    178,    148,    129,    108,     96,     85,     82,
+        79,     77,     61,     59,     57,     56,     51,     49,
+        48,     45,     42,     41,     40,     38,     36,     34,
+        31,     30,     21,     12,     10,      3,      1,      0,
+       255,    245,    244,    236,    233,    225,    217,    203,
+       190,    176,    175,    161,    149,    136,    125,    114,
+       102,     91,     81,     71,     60,     52,     43,     35,
+        28,     20,     19,     18,     12,     11,      5,      0
+};
+
+static const opus_uint8 silk_NLSF_CB2_SELECT_NB_MB[ 160 ] = {
+        16,      0,      0,      0,      0,     99,     66,     36,
+        36,     34,     36,     34,     34,     34,     34,     83,
+        69,     36,     52,     34,    116,    102,     70,     68,
+        68,    176,    102,     68,     68,     34,     65,     85,
+        68,     84,     36,    116,    141,    152,    139,    170,
+       132,    187,    184,    216,    137,    132,    249,    168,
+       185,    139,    104,    102,    100,     68,     68,    178,
+       218,    185,    185,    170,    244,    216,    187,    187,
+       170,    244,    187,    187,    219,    138,    103,    155,
+       184,    185,    137,    116,    183,    155,    152,    136,
+       132,    217,    184,    184,    170,    164,    217,    171,
+       155,    139,    244,    169,    184,    185,    170,    164,
+       216,    223,    218,    138,    214,    143,    188,    218,
+       168,    244,    141,    136,    155,    170,    168,    138,
+       220,    219,    139,    164,    219,    202,    216,    137,
+       168,    186,    246,    185,    139,    116,    185,    219,
+       185,    138,    100,    100,    134,    100,    102,     34,
+        68,     68,    100,     68,    168,    203,    221,    218,
+       168,    167,    154,    136,    104,     70,    164,    246,
+       171,    137,    139,    137,    155,    218,    219,    139
+};
+
+static const opus_uint8 silk_NLSF_CB2_iCDF_NB_MB[ 72 ] = {
+       255,    254,    253,    238,     14,      3,      2,      1,
+         0,    255,    254,    252,    218,     35,      3,      2,
+         1,      0,    255,    254,    250,    208,     59,      4,
+         2,      1,      0,    255,    254,    246,    194,     71,
+        10,      2,      1,      0,    255,    252,    236,    183,
+        82,      8,      2,      1,      0,    255,    252,    235,
+       180,     90,     17,      2,      1,      0,    255,    248,
+       224,    171,     97,     30,      4,      1,      0,    255,
+       254,    236,    173,     95,     37,      7,      1,      0
+};
+
+static const opus_uint8 silk_NLSF_CB2_BITS_NB_MB_Q5[ 72 ] = {
+       255,    255,    255,    131,      6,    145,    255,    255,
+       255,    255,    255,    236,     93,     15,     96,    255,
+       255,    255,    255,    255,    194,     83,     25,     71,
+       221,    255,    255,    255,    255,    162,     73,     34,
+        66,    162,    255,    255,    255,    210,    126,     73,
+        43,     57,    173,    255,    255,    255,    201,    125,
+        71,     48,     58,    130,    255,    255,    255,    166,
+       110,     73,     57,     62,    104,    210,    255,    255,
+       251,    123,     65,     55,     68,    100,    171,    255
+};
+
+static const opus_uint8 silk_NLSF_PRED_NB_MB_Q8[ 18 ] = {
+       179,    138,    140,    148,    151,    149,    153,    151,
+       163,    116,     67,     82,     59,     92,     72,    100,
+        89,     92
+};
+
+static const opus_int16 silk_NLSF_DELTA_MIN_NB_MB_Q15[ 11 ] = {
+       250,      3,      6,      3,      3,      3,      4,      3,
+         3,      3,    461
+};
+
+const silk_NLSF_CB_struct silk_NLSF_CB_NB_MB =
+{
+    32,
+    10,
+    SILK_FIX_CONST( 0.18, 16 ),
+    SILK_FIX_CONST( 1.0 / 0.18, 6 ),
+    silk_NLSF_CB1_NB_MB_Q8,
+    silk_NLSF_CB1_iCDF_NB_MB,
+    silk_NLSF_PRED_NB_MB_Q8,
+    silk_NLSF_CB2_SELECT_NB_MB,
+    silk_NLSF_CB2_iCDF_NB_MB,
+    silk_NLSF_CB2_BITS_NB_MB_Q5,
+    silk_NLSF_DELTA_MIN_NB_MB_Q15,
+};
diff --git a/drivers/opus/silk/tables_NLSF_CB_WB.c b/drivers/opus/silk/tables_NLSF_CB_WB.c
new file mode 100644
index 0000000000..d83567ea6f
--- /dev/null
+++ b/drivers/opus/silk/tables_NLSF_CB_WB.c
@@ -0,0 +1,198 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "tables.h"
+
+static const opus_uint8 silk_NLSF_CB1_WB_Q8[ 512 ] = {
+         7,     23,     38,     54,     69,     85,    100,    116,
+       131,    147,    162,    178,    193,    208,    223,    239,
+        13,     25,     41,     55,     69,     83,     98,    112,
+       127,    142,    157,    171,    187,    203,    220,    236,
+        15,     21,     34,     51,     61,     78,     92,    106,
+       126,    136,    152,    167,    185,    205,    225,    240,
+        10,     21,     36,     50,     63,     79,     95,    110,
+       126,    141,    157,    173,    189,    205,    221,    237,
+        17,     20,     37,     51,     59,     78,     89,    107,
+       123,    134,    150,    164,    184,    205,    224,    240,
+        10,     15,     32,     51,     67,     81,     96,    112,
+       129,    142,    158,    173,    189,    204,    220,    236,
+         8,     21,     37,     51,     65,     79,     98,    113,
+       126,    138,    155,    168,    179,    192,    209,    218,
+        12,     15,     34,     55,     63,     78,     87,    108,
+       118,    131,    148,    167,    185,    203,    219,    236,
+        16,     19,     32,     36,     56,     79,     91,    108,
+       118,    136,    154,    171,    186,    204,    220,    237,
+        11,     28,     43,     58,     74,     89,    105,    120,
+       135,    150,    165,    180,    196,    211,    226,    241,
+         6,     16,     33,     46,     60,     75,     92,    107,
+       123,    137,    156,    169,    185,    199,    214,    225,
+        11,     19,     30,     44,     57,     74,     89,    105,
+       121,    135,    152,    169,    186,    202,    218,    234,
+        12,     19,     29,     46,     57,     71,     88,    100,
+       120,    132,    148,    165,    182,    199,    216,    233,
+        17,     23,     35,     46,     56,     77,     92,    106,
+       123,    134,    152,    167,    185,    204,    222,    237,
+        14,     17,     45,     53,     63,     75,     89,    107,
+       115,    132,    151,    171,    188,    206,    221,    240,
+         9,     16,     29,     40,     56,     71,     88,    103,
+       119,    137,    154,    171,    189,    205,    222,    237,
+        16,     19,     36,     48,     57,     76,     87,    105,
+       118,    132,    150,    167,    185,    202,    218,    236,
+        12,     17,     29,     54,     71,     81,     94,    104,
+       126,    136,    149,    164,    182,    201,    221,    237,
+        15,     28,     47,     62,     79,     97,    115,    129,
+       142,    155,    168,    180,    194,    208,    223,    238,
+         8,     14,     30,     45,     62,     78,     94,    111,
+       127,    143,    159,    175,    192,    207,    223,    239,
+        17,     30,     49,     62,     79,     92,    107,    119,
+       132,    145,    160,    174,    190,    204,    220,    235,
+        14,     19,     36,     45,     61,     76,     91,    108,
+       121,    138,    154,    172,    189,    205,    222,    238,
+        12,     18,     31,     45,     60,     76,     91,    107,
+       123,    138,    154,    171,    187,    204,    221,    236,
+        13,     17,     31,     43,     53,     70,     83,    103,
+       114,    131,    149,    167,    185,    203,    220,    237,
+        17,     22,     35,     42,     58,     78,     93,    110,
+       125,    139,    155,    170,    188,    206,    224,    240,
+         8,     15,     34,     50,     67,     83,     99,    115,
+       131,    146,    162,    178,    193,    209,    224,    239,
+        13,     16,     41,     66,     73,     86,     95,    111,
+       128,    137,    150,    163,    183,    206,    225,    241,
+        17,     25,     37,     52,     63,     75,     92,    102,
+       119,    132,    144,    160,    175,    191,    212,    231,
+        19,     31,     49,     65,     83,    100,    117,    133,
+       147,    161,    174,    187,    200,    213,    227,    242,
+        18,     31,     52,     68,     88,    103,    117,    126,
+       138,    149,    163,    177,    192,    207,    223,    239,
+        16,     29,     47,     61,     76,     90,    106,    119,
+       133,    147,    161,    176,    193,    209,    224,    240,
+        15,     21,     35,     50,     61,     73,     86,     97,
+       110,    119,    129,    141,    175,    198,    218,    237
+};
+
+static const opus_uint8 silk_NLSF_CB1_iCDF_WB[ 64 ] = {
+       225,    204,    201,    184,    183,    175,    158,    154,
+       153,    135,    119,    115,    113,    110,    109,     99,
+        98,     95,     79,     68,     52,     50,     48,     45,
+        43,     32,     31,     27,     18,     10,      3,      0,
+       255,    251,    235,    230,    212,    201,    196,    182,
+       167,    166,    163,    151,    138,    124,    110,    104,
+        90,     78,     76,     70,     69,     57,     45,     34,
+        24,     21,     11,      6,      5,      4,      3,      0
+};
+
+static const opus_uint8 silk_NLSF_CB2_SELECT_WB[ 256 ] = {
+         0,      0,      0,      0,      0,      0,      0,      1,
+       100,    102,    102,     68,     68,     36,     34,     96,
+       164,    107,    158,    185,    180,    185,    139,    102,
+        64,     66,     36,     34,     34,      0,      1,     32,
+       208,    139,    141,    191,    152,    185,    155,    104,
+        96,    171,    104,    166,    102,    102,    102,    132,
+         1,      0,      0,      0,      0,     16,     16,      0,
+        80,    109,     78,    107,    185,    139,    103,    101,
+       208,    212,    141,    139,    173,    153,    123,    103,
+        36,      0,      0,      0,      0,      0,      0,      1,
+        48,      0,      0,      0,      0,      0,      0,     32,
+        68,    135,    123,    119,    119,    103,     69,     98,
+        68,    103,    120,    118,    118,    102,     71,     98,
+       134,    136,    157,    184,    182,    153,    139,    134,
+       208,    168,    248,     75,    189,    143,    121,    107,
+        32,     49,     34,     34,     34,      0,     17,      2,
+       210,    235,    139,    123,    185,    137,    105,    134,
+        98,    135,    104,    182,    100,    183,    171,    134,
+       100,     70,     68,     70,     66,     66,     34,    131,
+        64,    166,    102,     68,     36,      2,      1,      0,
+       134,    166,    102,     68,     34,     34,     66,    132,
+       212,    246,    158,    139,    107,    107,     87,    102,
+       100,    219,    125,    122,    137,    118,    103,    132,
+       114,    135,    137,    105,    171,    106,     50,     34,
+       164,    214,    141,    143,    185,    151,    121,    103,
+       192,     34,      0,      0,      0,      0,      0,      1,
+       208,    109,     74,    187,    134,    249,    159,    137,
+       102,    110,    154,    118,     87,    101,    119,    101,
+         0,      2,      0,     36,     36,     66,     68,     35,
+        96,    164,    102,    100,     36,      0,      2,     33,
+       167,    138,    174,    102,    100,     84,      2,      2,
+       100,    107,    120,    119,     36,    197,     24,      0
+};
+
+static const opus_uint8 silk_NLSF_CB2_iCDF_WB[ 72 ] = {
+       255,    254,    253,    244,     12,      3,      2,      1,
+         0,    255,    254,    252,    224,     38,      3,      2,
+         1,      0,    255,    254,    251,    209,     57,      4,
+         2,      1,      0,    255,    254,    244,    195,     69,
+         4,      2,      1,      0,    255,    251,    232,    184,
+        84,      7,      2,      1,      0,    255,    254,    240,
+       186,     86,     14,      2,      1,      0,    255,    254,
+       239,    178,     91,     30,      5,      1,      0,    255,
+       248,    227,    177,    100,     19,      2,      1,      0
+};
+
+static const opus_uint8 silk_NLSF_CB2_BITS_WB_Q5[ 72 ] = {
+       255,    255,    255,    156,      4,    154,    255,    255,
+       255,    255,    255,    227,    102,     15,     92,    255,
+       255,    255,    255,    255,    213,     83,     24,     72,
+       236,    255,    255,    255,    255,    150,     76,     33,
+        63,    214,    255,    255,    255,    190,    121,     77,
+        43,     55,    185,    255,    255,    255,    245,    137,
+        71,     43,     59,    139,    255,    255,    255,    255,
+       131,     66,     50,     66,    107,    194,    255,    255,
+       166,    116,     76,     55,     53,    125,    255,    255
+};
+
+static const opus_uint8 silk_NLSF_PRED_WB_Q8[ 30 ] = {
+       175,    148,    160,    176,    178,    173,    174,    164,
+       177,    174,    196,    182,    198,    192,    182,     68,
+        62,     66,     60,     72,    117,     85,     90,    118,
+       136,    151,    142,    160,    142,    155
+};
+
+static const opus_int16 silk_NLSF_DELTA_MIN_WB_Q15[ 17 ] = {
+       100,      3,     40,      3,      3,      3,      5,     14,
+        14,     10,     11,      3,      8,      9,      7,      3,
+       347
+};
+
+const silk_NLSF_CB_struct silk_NLSF_CB_WB =
+{
+    32,
+    16,
+    SILK_FIX_CONST( 0.15, 16 ),
+    SILK_FIX_CONST( 1.0 / 0.15, 6 ),
+    silk_NLSF_CB1_WB_Q8,
+    silk_NLSF_CB1_iCDF_WB,
+    silk_NLSF_PRED_WB_Q8,
+    silk_NLSF_CB2_SELECT_WB,
+    silk_NLSF_CB2_iCDF_WB,
+    silk_NLSF_CB2_BITS_WB_Q5,
+    silk_NLSF_DELTA_MIN_WB_Q15,
+};
+
diff --git a/drivers/opus/silk/tables_gain.c b/drivers/opus/silk/tables_gain.c
new file mode 100644
index 0000000000..6df980616b
--- /dev/null
+++ b/drivers/opus/silk/tables_gain.c
@@ -0,0 +1,63 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "tables.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+const opus_uint8 silk_gain_iCDF[ 3 ][ N_LEVELS_QGAIN / 8 ] =
+{
+{
+       224,    112,     44,     15,      3,      2,      1,      0
+},
+{
+       254,    237,    192,    132,     70,     23,      4,      0
+},
+{
+       255,    252,    226,    155,     61,     11,      2,      0
+}
+};
+
+const opus_uint8 silk_delta_gain_iCDF[ MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 ] = {
+       250,    245,    234,    203,     71,     50,     42,     38,
+        35,     33,     31,     29,     28,     27,     26,     25,
+        24,     23,     22,     21,     20,     19,     18,     17,
+        16,     15,     14,     13,     12,     11,     10,      9,
+         8,      7,      6,      5,      4,      3,      2,      1,
+         0
+};
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/drivers/opus/silk/tables_other.c b/drivers/opus/silk/tables_other.c
new file mode 100644
index 0000000000..246e960fa4
--- /dev/null
+++ b/drivers/opus/silk/tables_other.c
@@ -0,0 +1,138 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "structs.h"
+#include "define.h"
+#include "tables.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* Piece-wise linear mapping from bitrate in kbps to coding quality in dB SNR */
+const opus_int32 silk_TargetRate_table_NB[ TARGET_RATE_TAB_SZ ] = {
+    0,      8000,   9400,   11500,  13500,  17500,  25000,  MAX_TARGET_RATE_BPS
+};
+const opus_int32 silk_TargetRate_table_MB[ TARGET_RATE_TAB_SZ ] = {
+    0,      9000,   12000,  14500,  18500,  24500,  35500,  MAX_TARGET_RATE_BPS
+};
+const opus_int32 silk_TargetRate_table_WB[ TARGET_RATE_TAB_SZ ] = {
+    0,      10500,  14000,  17000,  21500,  28500,  42000,  MAX_TARGET_RATE_BPS
+};
+const opus_int16 silk_SNR_table_Q1[ TARGET_RATE_TAB_SZ ] = {
+    18,     29,     38,     40,     46,     52,     62,     84
+};
+
+/* Tables for stereo predictor coding */
+const opus_int16 silk_stereo_pred_quant_Q13[ STEREO_QUANT_TAB_SIZE ] = {
+    -13732, -10050, -8266, -7526, -6500, -5000, -2950,  -820,
+       820,   2950,  5000,  6500,  7526,  8266, 10050, 13732
+};
+const opus_uint8  silk_stereo_pred_joint_iCDF[ 25 ] = {
+    249, 247, 246, 245, 244,
+    234, 210, 202, 201, 200,
+    197, 174,  82,  59,  56,
+     55,  54,  46,  22,  12,
+     11,  10,   9,   7,   0
+};
+const opus_uint8  silk_stereo_only_code_mid_iCDF[ 2 ] = { 64, 0 };
+
+/* Tables for LBRR flags */
+static const opus_uint8 silk_LBRR_flags_2_iCDF[ 3 ] = { 203, 150, 0 };
+static const opus_uint8 silk_LBRR_flags_3_iCDF[ 7 ] = { 215, 195, 166, 125, 110, 82, 0 };
+const opus_uint8 * const silk_LBRR_flags_iCDF_ptr[ 2 ] = {
+    silk_LBRR_flags_2_iCDF,
+    silk_LBRR_flags_3_iCDF
+};
+
+/* Table for LSB coding */
+const opus_uint8 silk_lsb_iCDF[ 2 ] = { 120, 0 };
+
+/* Tables for LTPScale */
+const opus_uint8 silk_LTPscale_iCDF[ 3 ] = { 128, 64, 0 };
+
+/* Tables for signal type and offset coding */
+const opus_uint8 silk_type_offset_VAD_iCDF[ 4 ] = {
+       232,    158,    10,      0
+};
+const opus_uint8 silk_type_offset_no_VAD_iCDF[ 2 ] = {
+       230,      0
+};
+
+/* Tables for NLSF interpolation factor */
+const opus_uint8 silk_NLSF_interpolation_factor_iCDF[ 5 ] = { 243, 221, 192, 181, 0 };
+
+/* Quantization offsets */
+const opus_int16  silk_Quantization_Offsets_Q10[ 2 ][ 2 ] = {
+    { OFFSET_UVL_Q10, OFFSET_UVH_Q10 }, { OFFSET_VL_Q10, OFFSET_VH_Q10 }
+};
+
+/* Table for LTPScale */
+const opus_int16 silk_LTPScales_table_Q14[ 3 ] = { 15565, 12288, 8192 };
+
+/* Uniform entropy tables */
+const opus_uint8 silk_uniform3_iCDF[ 3 ] = { 171, 85, 0 };
+const opus_uint8 silk_uniform4_iCDF[ 4 ] = { 192, 128, 64, 0 };
+const opus_uint8 silk_uniform5_iCDF[ 5 ] = { 205, 154, 102, 51, 0 };
+const opus_uint8 silk_uniform6_iCDF[ 6 ] = { 213, 171, 128, 85, 43, 0 };
+const opus_uint8 silk_uniform8_iCDF[ 8 ] = { 224, 192, 160, 128, 96, 64, 32, 0 };
+
+const opus_uint8 silk_NLSF_EXT_iCDF[ 7 ] = { 100, 40, 16, 7, 3, 1, 0 };
+
+/*  Elliptic/Cauer filters designed with 0.1 dB passband ripple,
+        80 dB minimum stopband attenuation, and
+        [0.95 : 0.15 : 0.35] normalized cut off frequencies. */
+
+/* Interpolation points for filter coefficients used in the bandwidth transition smoother */
+const opus_int32 silk_Transition_LP_B_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NB ] =
+{
+{    250767114,  501534038,  250767114  },
+{    209867381,  419732057,  209867381  },
+{    170987846,  341967853,  170987846  },
+{    131531482,  263046905,  131531482  },
+{     89306658,  178584282,   89306658  }
+};
+
+/* Interpolation points for filter coefficients used in the bandwidth transition smoother */
+const opus_int32 silk_Transition_LP_A_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NA ] =
+{
+{    506393414,  239854379  },
+{    411067935,  169683996  },
+{    306733530,  116694253  },
+{    185807084,   77959395  },
+{     35497197,   57401098  }
+};
+
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/drivers/opus/silk/tables_pitch_lag.c b/drivers/opus/silk/tables_pitch_lag.c
new file mode 100644
index 0000000000..0af5c5ace7
--- /dev/null
+++ b/drivers/opus/silk/tables_pitch_lag.c
@@ -0,0 +1,69 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "tables.h"
+
+const opus_uint8 silk_pitch_lag_iCDF[ 2 * ( PITCH_EST_MAX_LAG_MS - PITCH_EST_MIN_LAG_MS ) ] = {
+       253,    250,    244,    233,    212,    182,    150,    131,
+       120,    110,     98,     85,     72,     60,     49,     40,
+        32,     25,     19,     15,     13,     11,      9,      8,
+         7,      6,      5,      4,      3,      2,      1,      0
+};
+
+const opus_uint8 silk_pitch_delta_iCDF[21] = {
+       210,    208,    206,    203,    199,    193,    183,    168,
+       142,    104,     74,     52,     37,     27,     20,     14,
+        10,      6,      4,      2,      0
+};
+
+const opus_uint8 silk_pitch_contour_iCDF[34] = {
+       223,    201,    183,    167,    152,    138,    124,    111,
+        98,     88,     79,     70,     62,     56,     50,     44,
+        39,     35,     31,     27,     24,     21,     18,     16,
+        14,     12,     10,      8,      6,      4,      3,      2,
+         1,      0
+};
+
+const opus_uint8 silk_pitch_contour_NB_iCDF[11] = {
+       188,    176,    155,    138,    119,     97,     67,     43,
+        26,     10,      0
+};
+
+const opus_uint8 silk_pitch_contour_10_ms_iCDF[12] = {
+       165,    119,     80,     61,     47,     35,     27,     20,
+        14,      9,      4,      0
+};
+
+const opus_uint8 silk_pitch_contour_10_ms_NB_iCDF[3] = {
+       113,     63,      0
+};
+
+
diff --git a/drivers/opus/silk/tables_pulses_per_block.c b/drivers/opus/silk/tables_pulses_per_block.c
new file mode 100644
index 0000000000..05ba2318f8
--- /dev/null
+++ b/drivers/opus/silk/tables_pulses_per_block.c
@@ -0,0 +1,264 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef OPUS_HAVE_CONFIG_H
+#include "opus_config.h"
+#endif
+
+#include "tables.h"
+
+const opus_uint8 silk_max_pulses_table[ 4 ] = {
+         8,     10,     12,     16
+};
+
+const opus_uint8 silk_pulses_per_block_iCDF[ 10 ][ 18 ] = {
+{
+       125,     51,     26,     18,     15,     12,     11,     10,
+         9,      8,      7,      6,      5,      4,      3,      2,
+         1,      0
+},
+{
+       198,    105,     45,     22,     15,     12,     11,     10,
+         9,      8,      7,      6,      5,      4,      3,      2,
+         1,      0
+},
+{
+       213,    162,    116,     83,     59,     43,     32,     24,
+        18,     15,     12,      9,      7,      6,      5,      3,
+         2,      0
+},
+{
+       239,    187,    116,     59,     28,     16,     11,     10,
+         9,      8,      7,      6,      5,      4,      3,      2,
+         1,      0
+},
+{
+       250,    229,    188,    135,     86,     51,     30,     19,
+        13,     10,      8,      6,      5,      4,      3,      2,
+         1,      0
+},
+{
+       249,    235,    213,    185,    156,    128,    103,     83,
+        66,     53,     42,     33,     26,     21,     17,     13,
+        10,      0
+},
+{
+       254,    249,    235,    206,    164,    118,     77,     46,
+        27,     16,     10,      7,      5,      4,      3,      2,
+         1,      0
+},
+{
+       255,    253,    249,    239,    220,    191,    156,    119,
+        85,     57,     37,     23,     15,     10,      6,      4,
+         2,      0
+},
+{
+       255,    253,    251,    246,    237,    223,    203,    179,
+       152,    124,     98,     75,     55,     40,     29,     21,
+        15,      0
+},
+{
+       255,    254,    253,    247,    220,    162,    106,     67,
+        42,     28,     18,     12,      9,      6,      4,      3,
+         2,      0
+}
+};
+
+const opus_uint8 silk_pulses_per_block_BITS_Q5[ 9 ][ 18 ] = {
+{
+        31,     57,    107,    160,    205,    205,    255,    255,
+       255,    255,    255,    255,    255,    255,    255,    255,
+       255,    255
+},
+{
+        69,     47,     67,    111,    166,    205,    255,    255,
+       255,    255,    255,    255,    255,    255,    255,    255,
+       255,    255
+},
+{
+        82,     74,     79,     95,    109,    128,    145,    160,
+       173,    205,    205,    205,    224,    255,    255,    224,
+       255,    224
+},
+{
+       125,     74,     59,     69,     97,    141,    182,    255,
+       255,    255,    255,    255,    255,    255,    255,    255,
+       255,    255
+},
+{
+       173,    115,     85,     73,     76,     92,    115,    145,
+       173,    205,    224,    224,    255,    255,    255,    255,
+       255,    255
+},
+{
+       166,    134,    113,    102,    101,    102,    107,    118,
+       125,    138,    145,    155,    166,    182,    192,    192,
+       205,    150
+},
+{
+       224,    182,    134,    101,     83,     79,     85,     97,
+       120,    145,    173,    205,    224,    255,    255,    255,
+       255,    255
+},
+{
+       255,    224,    192,    150,    120,    101,     92,     89,
+        93,    102,    118,    134,    160,    182,    192,    224,
+       224,    224
+},
+{
+       255,    224,    224,    182,    155,    134,    118,    109,
+       104,    102,    106,    111,    118,    131,    145,    160,
+       173,    131
+}
+};
+
+const opus_uint8 silk_rate_levels_iCDF[ 2 ][ 9 ] =
+{
+{
+       241,    190,    178,    132,     87,     74,     41,     14,
+         0
+},
+{
+       223,    193,    157,    140,    106,     57,     39,     18,
+         0
+}
+};
+
+const opus_uint8 silk_rate_levels_BITS_Q5[ 2 ][ 9 ] =
+{
+{
+       131,     74,    141,     79,     80,    138,     95,    104,
+       134
+},
+{
+        95,     99,     91,    125,     93,     76,    123,    115,
+       123
+}
+};
+
+const opus_uint8 silk_shell_code_table0[ 152 ] = {
+       128,      0,    214,     42,      0,    235,    128,     21,
+         0,    244,    184,     72,     11,      0,    248,    214,
+       128,     42,      7,      0,    248,    225,    170,     80,
+        25,      5,      0,    251,    236,    198,    126,     54,
+        18,      3,      0,    250,    238,    211,    159,     82,
+        35,     15,      5,      0,    250,    231,    203,    168,
+       128,     88,     53,     25,      6,      0,    252,    238,
+       216,    185,    148,    108,     71,     40,     18,      4,
+         0,    253,    243,    225,    199,    166,    128,     90,
+        57,     31,     13,      3,      0,    254,    246,    233,
+       212,    183,    147,    109,     73,     44,     23,     10,
+         2,      0,    255,    250,    240,    223,    198,    166,
+       128,     90,     58,     33,     16,      6,      1,      0,
+       255,    251,    244,    231,    210,    181,    146,    110,
+        75,     46,     25,     12,      5,      1,      0,    255,
+       253,    248,    238,    221,    196,    164,    128,     92,
+        60,     35,     18,      8,      3,      1,      0,    255,
+       253,    249,    242,    229,    208,    180,    146,    110,
+        76,     48,     27,     14,      7,      3,      1,      0
+};
+
+const opus_uint8 silk_shell_code_table1[ 152 ] = {
+       129,      0,    207,     50,      0,    236,    129,     20,
+         0,    245,    185,     72,     10,      0,    249,    213,
+       129,     42,      6,      0,    250,    226,    169,     87,
+        27,      4,      0,    251,    233,    194,    130,     62,
+        20,      4,      0,    250,    236,    207,    160,     99,
+        47,     17,      3,      0,    255,    240,    217,    182,
+       131,     81,     41,     11,      1,      0,    255,    254,
+       233,    201,    159,    107,     61,     20,      2,      1,
+         0,    255,    249,    233,    206,    170,    128,     86,
+        50,     23,      7,      1,      0,    255,    250,    238,
+       217,    186,    148,    108,     70,     39,     18,      6,
+         1,      0,    255,    252,    243,    226,    200,    166,
+       128,     90,     56,     30,     13,      4,      1,      0,
+       255,    252,    245,    231,    209,    180,    146,    110,
+        76,     47,     25,     11,      4,      1,      0,    255,
+       253,    248,    237,    219,    194,    163,    128,     93,
+        62,     37,     19,      8,      3,      1,      0,    255,
+       254,    250,    241,    226,    205,    177,    145,    111,
+        79,     51,     30,     15,      6,      2,      1,      0
+};
+
+const opus_uint8 silk_shell_code_table2[ 152 ] = {
+       129,      0,    203,     54,      0,    234,    129,     23,
+         0,    245,    184,     73,     10,      0,    250,    215,
+       129,     41,      5,      0,    252,    232,    173,     86,
+        24,      3,      0,    253,    240,    200,    129,     56,
+        15,      2,      0,    253,    244,    217,    164,     94,
+        38,     10,      1,      0,    253,    245,    226,    189,
+       132,     71,     27,      7,      1,      0,    253,    246,
+       231,    203,    159,    105,     56,     23,      6,      1,
+         0,    255,    248,    235,    213,    179,    133,     85,
+        47,     19,      5,      1,      0,    255,    254,    243,
+       221,    194,    159,    117,     70,     37,     12,      2,
+         1,      0,    255,    254,    248,    234,    208,    171,
+       128,     85,     48,     22,      8,      2,      1,      0,
+       255,    254,    250,    240,    220,    189,    149,    107,
+        67,     36,     16,      6,      2,      1,      0,    255,
+       254,    251,    243,    227,    201,    166,    128,     90,
+        55,     29,     13,      5,      2,      1,      0,    255,
+       254,    252,    246,    234,    213,    183,    147,    109,
+        73,     43,     22,     10,      4,      2,      1,      0
+};
+
+const opus_uint8 silk_shell_code_table3[ 152 ] = {
+       130,      0,    200,     58,      0,    231,    130,     26,
+         0,    244,    184,     76,     12,      0,    249,    214,
+       130,     43,      6,      0,    252,    232,    173,     87,
+        24,      3,      0,    253,    241,    203,    131,     56,
+        14,      2,      0,    254,    246,    221,    167,     94,
+        35,      8,      1,      0,    254,    249,    232,    193,
+       130,     65,     23,      5,      1,      0,    255,    251,
+       239,    211,    162,     99,     45,     15,      4,      1,
+         0,    255,    251,    243,    223,    186,    131,     74,
+        33,     11,      3,      1,      0,    255,    252,    245,
+       230,    202,    158,    105,     57,     24,      8,      2,
+         1,      0,    255,    253,    247,    235,    214,    179,
+       132,     84,     44,     19,      7,      2,      1,      0,
+       255,    254,    250,    240,    223,    196,    159,    112,
+        69,     36,     15,      6,      2,      1,      0,    255,
+       254,    253,    245,    231,    209,    176,    136,     93,
+        55,     27,     11,      3,      2,      1,      0,    255,
+       254,    253,    252,    239,    221,    194,    158,    117,
+        76,     42,     18,      4,      3,      2,      1,      0
+};
+
+const opus_uint8 silk_shell_code_table_offsets[ 17 ] = {
+         0,      0,      2,      5,      9,     14,     20,     27,
+        35,     44,     54,     65,     77,     90,    104,    119,
+       135
+};
+
+const opus_uint8 silk_sign_iCDF[ 42 ] = {
+       254,     49,     67,     77,     82,     93,     99,
+       198,     11,     18,     24,     31,     36,     45,
+       255,     46,     66,     78,     87,     94,    104,
+       208,     14,     21,     32,     42,     51,     66,
+       255,     94,    104,    109,    112,    115,    118,
+       248,     53,     69,     80,     88,     95,    102
+};
diff --git a/drivers/opus/silk/tuning_parameters.h b/drivers/opus/silk/tuning_parameters.h
new file mode 100644
index 0000000000..e1057bbaae
--- /dev/null
+++ b/drivers/opus/silk/tuning_parameters.h
@@ -0,0 +1,171 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_TUNING_PARAMETERS_H
+#define SILK_TUNING_PARAMETERS_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* Decay time for bitreservoir */
+#define BITRESERVOIR_DECAY_TIME_MS                      500
+
+/*******************/
+/* Pitch estimator */
+/*******************/
+
+/* Level of noise floor for whitening filter LPC analysis in pitch analysis */
+#define FIND_PITCH_WHITE_NOISE_FRACTION                 1e-3f
+
+/* Bandwidth expansion for whitening filter in pitch analysis */
+#define FIND_PITCH_BANDWIDTH_EXPANSION                  0.99f
+
+/*********************/
+/* Linear prediction */
+/*********************/
+
+/* LPC analysis regularization */
+#define FIND_LPC_COND_FAC                               1e-5f
+
+/* LTP analysis defines */
+#define FIND_LTP_COND_FAC                               1e-5f
+#define LTP_DAMPING                                     0.05f
+#define LTP_SMOOTHING                                   0.1f
+
+/* LTP quantization settings */
+#define MU_LTP_QUANT_NB                                 0.03f
+#define MU_LTP_QUANT_MB                                 0.025f
+#define MU_LTP_QUANT_WB                                 0.02f
+
+/* Max cumulative LTP gain */
+#define MAX_SUM_LOG_GAIN_DB								250.0f
+
+/***********************/
+/* High pass filtering */
+/***********************/
+
+/* Smoothing parameters for low end of pitch frequency range estimation */
+#define VARIABLE_HP_SMTH_COEF1                          0.1f
+#define VARIABLE_HP_SMTH_COEF2                          0.015f
+#define VARIABLE_HP_MAX_DELTA_FREQ                      0.4f
+
+/* Min and max cut-off frequency values (-3 dB points) */
+#define VARIABLE_HP_MIN_CUTOFF_HZ                       60
+#define VARIABLE_HP_MAX_CUTOFF_HZ                       100
+
+/***********/
+/* Various */
+/***********/
+
+/* VAD threshold */
+#define SPEECH_ACTIVITY_DTX_THRES                       0.05f
+
+/* Speech Activity LBRR enable threshold */
+#define LBRR_SPEECH_ACTIVITY_THRES                      0.3f
+
+/*************************/
+/* Perceptual parameters */
+/*************************/
+
+/* reduction in coding SNR during low speech activity */
+#define BG_SNR_DECR_dB                                  2.0f
+
+/* factor for reducing quantization noise during voiced speech */
+#define HARM_SNR_INCR_dB                                2.0f
+
+/* factor for reducing quantization noise for unvoiced sparse signals */
+#define SPARSE_SNR_INCR_dB                              2.0f
+
+/* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
+#define SPARSENESS_THRESHOLD_QNT_OFFSET                 0.75f
+
+/* warping control */
+#define WARPING_MULTIPLIER                              0.015f
+
+/* fraction added to first autocorrelation value */
+#define SHAPE_WHITE_NOISE_FRACTION                      5e-5f
+
+/* noise shaping filter chirp factor */
+#define BANDWIDTH_EXPANSION                             0.95f
+
+/* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */
+#define LOW_RATE_BANDWIDTH_EXPANSION_DELTA              0.01f
+
+/* extra harmonic boosting (signal shaping) at low bitrates */
+#define LOW_RATE_HARMONIC_BOOST                         0.1f
+
+/* extra harmonic boosting (signal shaping) for noisy input signals */
+#define LOW_INPUT_QUALITY_HARMONIC_BOOST                0.1f
+
+/* harmonic noise shaping */
+#define HARMONIC_SHAPING                                0.3f
+
+/* extra harmonic noise shaping for high bitrates or noisy input */
+#define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING       0.2f
+
+/* parameter for shaping noise towards higher frequencies */
+#define HP_NOISE_COEF                                   0.25f
+
+/* parameter for shaping noise even more towards higher frequencies during voiced speech */
+#define HARM_HP_NOISE_COEF                              0.35f
+
+/* parameter for applying a high-pass tilt to the input signal */
+#define INPUT_TILT                                      0.05f
+
+/* parameter for extra high-pass tilt to the input signal at high rates */
+#define HIGH_RATE_INPUT_TILT                            0.1f
+
+/* parameter for reducing noise at the very low frequencies */
+#define LOW_FREQ_SHAPING                                4.0f
+
+/* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
+#define LOW_QUALITY_LOW_FREQ_SHAPING_DECR               0.5f
+
+/* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */
+#define SUBFR_SMTH_COEF                                 0.4f
+
+/* parameters defining the R/D tradeoff in the residual quantizer */
+#define LAMBDA_OFFSET                                   1.2f
+#define LAMBDA_SPEECH_ACT                               -0.2f
+#define LAMBDA_DELAYED_DECISIONS                        -0.05f
+#define LAMBDA_INPUT_QUALITY                            -0.1f
+#define LAMBDA_CODING_QUALITY                           -0.2f
+#define LAMBDA_QUANT_OFFSET                             0.8f
+
+/* Compensation in bitrate calculations for 10 ms modes */
+#define REDUCE_BITRATE_10_MS_BPS                        2200
+
+/* Maximum time before allowing a bandwidth transition */
+#define MAX_BANDWIDTH_SWITCH_DELAY_MS                   5000
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SILK_TUNING_PARAMETERS_H */
diff --git a/drivers/opus/silk/typedef.h b/drivers/opus/silk/typedef.h
new file mode 100644
index 0000000000..ca2361bc82
--- /dev/null
+++ b/drivers/opus/silk/typedef.h
@@ -0,0 +1,78 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_TYPEDEF_H
+#define SILK_TYPEDEF_H
+
+#include "opus_types.h"
+#include "opus_defines.h"
+
+#ifndef OPUS_FIXED_POINT
+# include <float.h>
+# define silk_float      float
+# define silk_float_MAX  FLT_MAX
+#endif
+
+#define silk_int64_MAX   ((opus_int64)0x7FFFFFFFFFFFFFFFLL)   /*  2^63 - 1 */
+#define silk_int64_MIN   ((opus_int64)0x8000000000000000LL)   /* -2^63 */
+#define silk_int32_MAX   0x7FFFFFFF                           /*  2^31 - 1 =  2147483647 */
+#define silk_int32_MIN   ((opus_int32)0x80000000)             /* -2^31     = -2147483648 */
+#define silk_int16_MAX   0x7FFF                               /*  2^15 - 1 =  32767 */
+#define silk_int16_MIN   ((opus_int16)0x8000)                 /* -2^15     = -32768 */
+#define silk_int8_MAX    0x7F                                 /*  2^7 - 1  =  127 */
+#define silk_int8_MIN    ((opus_int8)0x80)                    /* -2^7      = -128 */
+#define silk_uint8_MAX   0xFF                                 /*  2^8 - 1 = 255 */
+
+#define silk_TRUE        1
+#define silk_FALSE       0
+
+/* assertions */
+#if (defined _WIN32 && !defined _WINCE && !defined(__GNUC__) && !defined(NO_ASSERTS))
+# ifndef silk_assert
+#  include <crtdbg.h>      /* ASSERTE() */
+#  define silk_assert(COND)   _ASSERTE(COND)
+# endif
+#else
+# ifdef ENABLE_ASSERTIONS
+#  include <stdio.h>
+#  include <stdlib.h>
+#define silk_fatal(str) _silk_fatal(str, __FILE__, __LINE__);
+#ifdef __GNUC__
+__attribute__((noreturn))
+#endif
+static OPUS_INLINE void _silk_fatal(const char *str, const char *file, int line)
+{
+   fprintf (stderr, "Fatal (internal) error in %s, line %d: %s\n", file, line, str);
+   abort();
+}
+#  define silk_assert(COND) {if (!(COND)) {silk_fatal("assertion failed: " #COND);}}
+# else
+#  define silk_assert(COND)
+# endif
+#endif
+
+#endif /* SILK_TYPEDEF_H */