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