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https://github.com/xiph/opus.git
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17c5966045
- Draft updates - Updated code to produce and check test vectors - Making sure that the test vectors pass at all rates as well as for mono and stereo
108 lines
5 KiB
C
108 lines
5 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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/* Set decoder sampling rate */
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opus_int silk_decoder_set_fs(
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silk_decoder_state *psDec, /* I/O Decoder state pointer */
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opus_int fs_kHz, /* I Sampling frequency (kHz) */
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opus_int fs_API_Hz /* I API Sampling frequency (Hz) */
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)
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{
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opus_int frame_length, ret = 0;
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silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
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silk_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );
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/* New (sub)frame length */
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psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );
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frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );
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/* Initialize resampler when switching internal or external sampling frequency */
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if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {
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/* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */
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ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );
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psDec->fs_API_hz = fs_API_Hz;
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}
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if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {
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if( fs_kHz == 8 ) {
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if( psDec->nb_subfr == MAX_NB_SUBFR ) {
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psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
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} else {
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psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
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}
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} else {
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if( psDec->nb_subfr == MAX_NB_SUBFR ) {
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psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;
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} else {
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psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
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}
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}
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if( psDec->fs_kHz != fs_kHz ) {
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psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
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if( fs_kHz == 8 || fs_kHz == 12 ) {
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psDec->LPC_order = MIN_LPC_ORDER;
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psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;
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} else {
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psDec->LPC_order = MAX_LPC_ORDER;
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psDec->psNLSF_CB = &silk_NLSF_CB_WB;
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}
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if( fs_kHz == 16 ) {
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psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
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} else if( fs_kHz == 12 ) {
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psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
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} else if( fs_kHz == 8 ) {
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psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
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} else {
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/* unsupported sampling rate */
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silk_assert( 0 );
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}
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psDec->first_frame_after_reset = 1;
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psDec->lagPrev = 100;
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psDec->LastGainIndex = 10;
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psDec->prevSignalType = TYPE_NO_VOICE_ACTIVITY;
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silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));
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silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );
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}
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psDec->fs_kHz = fs_kHz;
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psDec->frame_length = frame_length;
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}
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/* Check that settings are valid */
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silk_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );
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return ret;
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}
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