diff options
Diffstat (limited to 'thirdparty/opus/silk/resampler_down2_3.c')
| -rw-r--r-- | thirdparty/opus/silk/resampler_down2_3.c | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/thirdparty/opus/silk/resampler_down2_3.c b/thirdparty/opus/silk/resampler_down2_3.c deleted file mode 100644 index 4342614dcc..0000000000 --- a/thirdparty/opus/silk/resampler_down2_3.c +++ /dev/null @@ -1,103 +0,0 @@ -/*********************************************************************** -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 "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; -} |