113 lines
5.4 KiB
C
113 lines
5.4 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, are permitted provided that the following conditions
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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 Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "opus/opus_config.h"
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#include "opus/silk/main.h"
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/* Decode parameters from payload */
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void silk_decode_parameters(
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silk_decoder_state *psDec, /* I/O State */
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silk_decoder_control *psDecCtrl, /* I/O Decoder control */
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opus_int condCoding /* I The type of conditional coding to use */
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)
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{
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opus_int i, k, Ix;
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opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
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const opus_int8 *cbk_ptr_Q7;
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/* Dequant Gains */
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silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices,
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&psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr );
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/****************/
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/* Decode NLSFs */
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/****************/
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silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB );
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/* Convert NLSF parameters to AR prediction filter coefficients */
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silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order );
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/* If just reset, e.g., because internal Fs changed, do not allow interpolation */
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/* improves the case of packet loss in the first frame after a switch */
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if( psDec->first_frame_after_reset == 1 ) {
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psDec->indices.NLSFInterpCoef_Q2 = 4;
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}
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if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) {
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/* Calculation of the interpolated NLSF0 vector from the interpolation factor, */
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/* the previous NLSF1, and the current NLSF1 */
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for( i = 0; i < psDec->LPC_order; i++ ) {
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pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2,
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pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 );
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}
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/* Convert NLSF parameters to AR prediction filter coefficients */
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silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order );
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} else {
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/* Copy LPC coefficients for first half from second half */
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silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
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}
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silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) );
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/* After a packet loss do BWE of LPC coefs */
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if( psDec->lossCnt ) {
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silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
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silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
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}
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if( psDec->indices.signalType == TYPE_VOICED ) {
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/*********************/
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/* Decode pitch lags */
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/*********************/
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/* Decode pitch values */
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silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr );
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/* Decode Codebook Index */
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cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */
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for( k = 0; k < psDec->nb_subfr; k++ ) {
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Ix = psDec->indices.LTPIndex[ k ];
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for( i = 0; i < LTP_ORDER; i++ ) {
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psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 );
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}
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}
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/**********************/
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/* Decode LTP scaling */
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/**********************/
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Ix = psDec->indices.LTP_scaleIndex;
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psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ];
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} else {
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silk_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( opus_int ) );
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silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) );
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psDec->indices.PERIndex = 0;
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psDecCtrl->LTP_scale_Q14 = 0;
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}
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}
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