1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/decode_parameters.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,115 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main.h"
1.36 +
1.37 +/* Decode parameters from payload */
1.38 +void silk_decode_parameters(
1.39 + silk_decoder_state *psDec, /* I/O State */
1.40 + silk_decoder_control *psDecCtrl, /* I/O Decoder control */
1.41 + opus_int condCoding /* I The type of conditional coding to use */
1.42 +)
1.43 +{
1.44 + opus_int i, k, Ix;
1.45 + opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
1.46 + const opus_int8 *cbk_ptr_Q7;
1.47 +
1.48 + /* Dequant Gains */
1.49 + silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices,
1.50 + &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr );
1.51 +
1.52 + /****************/
1.53 + /* Decode NLSFs */
1.54 + /****************/
1.55 + silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB );
1.56 +
1.57 + /* Convert NLSF parameters to AR prediction filter coefficients */
1.58 + silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order );
1.59 +
1.60 + /* If just reset, e.g., because internal Fs changed, do not allow interpolation */
1.61 + /* improves the case of packet loss in the first frame after a switch */
1.62 + if( psDec->first_frame_after_reset == 1 ) {
1.63 + psDec->indices.NLSFInterpCoef_Q2 = 4;
1.64 + }
1.65 +
1.66 + if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) {
1.67 + /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */
1.68 + /* the previous NLSF1, and the current NLSF1 */
1.69 + for( i = 0; i < psDec->LPC_order; i++ ) {
1.70 + pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2,
1.71 + pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 );
1.72 + }
1.73 +
1.74 + /* Convert NLSF parameters to AR prediction filter coefficients */
1.75 + silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order );
1.76 + } else {
1.77 + /* Copy LPC coefficients for first half from second half */
1.78 + silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
1.79 + }
1.80 +
1.81 + silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) );
1.82 +
1.83 + /* After a packet loss do BWE of LPC coefs */
1.84 + if( psDec->lossCnt ) {
1.85 + silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
1.86 + silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
1.87 + }
1.88 +
1.89 + if( psDec->indices.signalType == TYPE_VOICED ) {
1.90 + /*********************/
1.91 + /* Decode pitch lags */
1.92 + /*********************/
1.93 +
1.94 + /* Decode pitch values */
1.95 + silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr );
1.96 +
1.97 + /* Decode Codebook Index */
1.98 + cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */
1.99 +
1.100 + for( k = 0; k < psDec->nb_subfr; k++ ) {
1.101 + Ix = psDec->indices.LTPIndex[ k ];
1.102 + for( i = 0; i < LTP_ORDER; i++ ) {
1.103 + psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 );
1.104 + }
1.105 + }
1.106 +
1.107 + /**********************/
1.108 + /* Decode LTP scaling */
1.109 + /**********************/
1.110 + Ix = psDec->indices.LTP_scaleIndex;
1.111 + psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ];
1.112 + } else {
1.113 + silk_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( opus_int ) );
1.114 + silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) );
1.115 + psDec->indices.PERIndex = 0;
1.116 + psDecCtrl->LTP_scale_Q14 = 0;
1.117 + }
1.118 +}
