mirror of
https://github.com/xiph/opus.git
synced 2025-05-23 03:39:17 +00:00
53cc1a033a
b24e5746 introduced changes to LastGainIndex which broke
conditional coding for side frames after a mid-only frame (i.e.,
in a 60 ms frame where the side is coded, not coded, then coded
again).
These rules were a mess in general, however, because the side
channel state kept a different nFramesDecoded count from the mid
channel state, and had no way to tell if the prior side frame was
coded.
This patch attempts to rationalize them by moving the conditional
coding decision up to the top level, where all this information is
available.
The first coded side frame after an uncoded side frame now always
uses independent coding.
If such a frame is also not the first side frame in an Opus frame,
then it doesn't include an LTP scaling parameter (because the LTP
state is well-defined).
116 lines
5.5 KiB
C
116 lines
5.5 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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/* 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 ],
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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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