cannam@154: /***********************************************************************
cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
cannam@154: Redistribution and use in source and binary forms, with or without
cannam@154: modification, are permitted provided that the following conditions
cannam@154: are met:
cannam@154: - Redistributions of source code must retain the above copyright notice,
cannam@154: this list of conditions and the following disclaimer.
cannam@154: - Redistributions in binary form must reproduce the above copyright
cannam@154: notice, this list of conditions and the following disclaimer in the
cannam@154: documentation and/or other materials provided with the distribution.
cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the
cannam@154: names of specific contributors, may be used to endorse or promote
cannam@154: products derived from this software without specific prior written
cannam@154: permission.
cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
cannam@154: POSSIBILITY OF SUCH DAMAGE.
cannam@154: ***********************************************************************/
cannam@154: 
cannam@154: #ifdef HAVE_CONFIG_H
cannam@154: #include "config.h"
cannam@154: #endif
cannam@154: 
cannam@154: #include "main.h"
cannam@154: 
cannam@154: /* Decode parameters from payload */
cannam@154: void silk_decode_parameters(
cannam@154:     silk_decoder_state          *psDec,                         /* I/O  State                                       */
cannam@154:     silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
cannam@154:     opus_int                    condCoding                      /* I    The type of conditional coding to use       */
cannam@154: )
cannam@154: {
cannam@154:     opus_int   i, k, Ix;
cannam@154:     opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
cannam@154:     const opus_int8 *cbk_ptr_Q7;
cannam@154: 
cannam@154:     /* Dequant Gains */
cannam@154:     silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices,
cannam@154:         &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr );
cannam@154: 
cannam@154:     /****************/
cannam@154:     /* Decode NLSFs */
cannam@154:     /****************/
cannam@154:     silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB );
cannam@154: 
cannam@154:     /* Convert NLSF parameters to AR prediction filter coefficients */
cannam@154:     silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order, psDec->arch );
cannam@154: 
cannam@154:     /* If just reset, e.g., because internal Fs changed, do not allow interpolation */
cannam@154:     /* improves the case of packet loss in the first frame after a switch           */
cannam@154:     if( psDec->first_frame_after_reset == 1 ) {
cannam@154:         psDec->indices.NLSFInterpCoef_Q2 = 4;
cannam@154:     }
cannam@154: 
cannam@154:     if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) {
cannam@154:         /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */
cannam@154:         /* the previous NLSF1, and the current NLSF1                                   */
cannam@154:         for( i = 0; i < psDec->LPC_order; i++ ) {
cannam@154:             pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2,
cannam@154:                 pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 );
cannam@154:         }
cannam@154: 
cannam@154:         /* Convert NLSF parameters to AR prediction filter coefficients */
cannam@154:         silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order, psDec->arch );
cannam@154:     } else {
cannam@154:         /* Copy LPC coefficients for first half from second half */
cannam@154:         silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
cannam@154:     }
cannam@154: 
cannam@154:     silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) );
cannam@154: 
cannam@154:     /* After a packet loss do BWE of LPC coefs */
cannam@154:     if( psDec->lossCnt ) {
cannam@154:         silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
cannam@154:         silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
cannam@154:     }
cannam@154: 
cannam@154:     if( psDec->indices.signalType == TYPE_VOICED ) {
cannam@154:         /*********************/
cannam@154:         /* Decode pitch lags */
cannam@154:         /*********************/
cannam@154: 
cannam@154:         /* Decode pitch values */
cannam@154:         silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr );
cannam@154: 
cannam@154:         /* Decode Codebook Index */
cannam@154:         cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */
cannam@154: 
cannam@154:         for( k = 0; k < psDec->nb_subfr; k++ ) {
cannam@154:             Ix = psDec->indices.LTPIndex[ k ];
cannam@154:             for( i = 0; i < LTP_ORDER; i++ ) {
cannam@154:                 psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 );
cannam@154:             }
cannam@154:         }
cannam@154: 
cannam@154:         /**********************/
cannam@154:         /* Decode LTP scaling */
cannam@154:         /**********************/
cannam@154:         Ix = psDec->indices.LTP_scaleIndex;
cannam@154:         psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ];
cannam@154:     } else {
cannam@154:         silk_memset( psDecCtrl->pitchL,      0,             psDec->nb_subfr * sizeof( opus_int   ) );
cannam@154:         silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) );
cannam@154:         psDec->indices.PERIndex  = 0;
cannam@154:         psDecCtrl->LTP_scale_Q14 = 0;
cannam@154:     }
cannam@154: }