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-rw-r--r--thirdparty/opus/silk/VAD.c362
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diff --git a/thirdparty/opus/silk/VAD.c b/thirdparty/opus/silk/VAD.c
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--- a/thirdparty/opus/silk/VAD.c
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-/***********************************************************************
-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 HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "main.h"
-#include "stack_alloc.h"
-
-/* Silk VAD noise level estimation */
-# if !defined(OPUS_X86_MAY_HAVE_SSE4_1)
-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 */
-);
-#endif
-
-/**********************************/
-/* 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_c( /* 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 */
-/**************************/
-# if !defined(OPUS_X86_MAY_HAVE_SSE4_1)
-static OPUS_INLINE
-#endif
-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++;
-}
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