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nothing a little perl can't extract from a draft
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@16944 d0543943-73ff-0310-b7d9-9358b9ac24b2
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/***********************************************************************
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Copyright (c) 2006-2010, 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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#include "SKP_Silk_main.h"
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/* Decode parameters from payload */
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void SKP_Silk_decode_parameters(
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SKP_Silk_decoder_state *psDec, /* I/O State */
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SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */
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SKP_int q[], /* O Excitation signal */
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const SKP_int fullDecoding /* I Flag to tell if only arithmetic decoding */
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)
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{
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SKP_int i, k, Ix, fs_kHz_dec, nBytesUsed;
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SKP_int Ixs[ NB_SUBFR ];
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SKP_int GainsIndices[ NB_SUBFR ];
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SKP_int NLSFIndices[ NLSF_MSVQ_MAX_CB_STAGES ];
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SKP_int pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
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const SKP_int16 *cbk_ptr_Q14;
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const SKP_Silk_NLSF_CB_struct *psNLSF_CB = NULL;
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SKP_Silk_range_coder_state *psRC = &psDec->sRC;
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/************************/
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/* Decode sampling rate */
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/************************/
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/* only done for first frame of packet */
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if( psDec->nFramesDecoded == 0 ) {
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SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_SamplingRates_CDF, SKP_Silk_SamplingRates_offset );
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/* check that sampling rate is supported */
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if( Ix < 0 || Ix > 3 ) {
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psRC->error = RANGE_CODER_ILLEGAL_SAMPLING_RATE;
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return;
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}
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fs_kHz_dec = SKP_Silk_SamplingRates_table[ Ix ];
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SKP_Silk_decoder_set_fs( psDec, fs_kHz_dec );
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}
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/*******************************************/
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/* Decode signal type and quantizer offset */
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/*******************************************/
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if( psDec->nFramesDecoded == 0 ) {
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/* first frame in packet: independent coding */
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SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_type_offset_CDF, SKP_Silk_type_offset_CDF_offset );
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} else {
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/* condidtional coding */
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SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_type_offset_joint_CDF[ psDec->typeOffsetPrev ],
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SKP_Silk_type_offset_CDF_offset );
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}
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psDecCtrl->sigtype = SKP_RSHIFT( Ix, 1 );
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psDecCtrl->QuantOffsetType = Ix & 1;
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psDec->typeOffsetPrev = Ix;
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/****************/
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/* Decode gains */
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/****************/
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/* first subframe */
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if( psDec->nFramesDecoded == 0 ) {
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/* first frame in packet: independent coding */
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SKP_Silk_range_decoder( &GainsIndices[ 0 ], psRC, SKP_Silk_gain_CDF[ psDecCtrl->sigtype ], SKP_Silk_gain_CDF_offset );
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} else {
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/* condidtional coding */
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SKP_Silk_range_decoder( &GainsIndices[ 0 ], psRC, SKP_Silk_delta_gain_CDF, SKP_Silk_delta_gain_CDF_offset );
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}
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/* remaining subframes */
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for( i = 1; i < NB_SUBFR; i++ ) {
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SKP_Silk_range_decoder( &GainsIndices[ i ], psRC, SKP_Silk_delta_gain_CDF, SKP_Silk_delta_gain_CDF_offset );
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}
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/* Dequant Gains */
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SKP_Silk_gains_dequant( psDecCtrl->Gains_Q16, GainsIndices, &psDec->LastGainIndex, psDec->nFramesDecoded );
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/***************/
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/* Decode LSFs */
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/***************/
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/* Set pointer to LSF VQ CB for the current signal type */
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psNLSF_CB = psDec->psNLSF_CB[ psDecCtrl->sigtype ];
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/* Arithmetically decode NLSF path */
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SKP_Silk_range_decoder_multi( NLSFIndices, psRC, psNLSF_CB->StartPtr, psNLSF_CB->MiddleIx, psNLSF_CB->nStages );
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/* From the NLSF path, decode an NLSF vector */
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SKP_Silk_NLSF_MSVQ_decode( pNLSF_Q15, psNLSF_CB, NLSFIndices, psDec->LPC_order );
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/************************************/
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/* Decode NLSF interpolation factor */
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/************************************/
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SKP_Silk_range_decoder( &psDecCtrl->NLSFInterpCoef_Q2, psRC, SKP_Silk_NLSF_interpolation_factor_CDF,
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SKP_Silk_NLSF_interpolation_factor_offset );
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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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psDecCtrl->NLSFInterpCoef_Q2 = 4;
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}
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if( fullDecoding ) {
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/* Convert NLSF parameters to AR prediction filter coefficients */
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SKP_Silk_NLSF2A_stable( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order );
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if( psDecCtrl->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 ] + SKP_RSHIFT( SKP_MUL( psDecCtrl->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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SKP_Silk_NLSF2A_stable( 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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SKP_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ],
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psDec->LPC_order * sizeof( SKP_int16 ) );
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}
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}
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SKP_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( SKP_int ) );
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/* After a packet loss do BWE of LPC coefs */
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if( psDec->lossCnt ) {
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SKP_Silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
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SKP_Silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
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}
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if( psDecCtrl->sigtype == SIG_TYPE_VOICED ) {
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/*********************/
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/* Decode pitch lags */
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/*********************/
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/* Get lag index */
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if( psDec->fs_kHz == 8 ) {
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SKP_Silk_range_decoder( &Ixs[ 0 ], psRC, SKP_Silk_pitch_lag_NB_CDF, SKP_Silk_pitch_lag_NB_CDF_offset );
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} else if( psDec->fs_kHz == 12 ) {
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SKP_Silk_range_decoder( &Ixs[ 0 ], psRC, SKP_Silk_pitch_lag_MB_CDF, SKP_Silk_pitch_lag_MB_CDF_offset );
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} else if( psDec->fs_kHz == 16 ) {
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SKP_Silk_range_decoder( &Ixs[ 0 ], psRC, SKP_Silk_pitch_lag_WB_CDF, SKP_Silk_pitch_lag_WB_CDF_offset );
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} else {
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SKP_Silk_range_decoder( &Ixs[ 0 ], psRC, SKP_Silk_pitch_lag_SWB_CDF, SKP_Silk_pitch_lag_SWB_CDF_offset );
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}
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/* Get countour index */
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if( psDec->fs_kHz == 8 ) {
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/* Less codevectors used in 8 khz mode */
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SKP_Silk_range_decoder( &Ixs[ 1 ], psRC, SKP_Silk_pitch_contour_NB_CDF, SKP_Silk_pitch_contour_NB_CDF_offset );
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} else {
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/* Joint for 12, 16, and 24 khz */
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SKP_Silk_range_decoder( &Ixs[ 1 ], psRC, SKP_Silk_pitch_contour_CDF, SKP_Silk_pitch_contour_CDF_offset );
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}
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/* Decode pitch values */
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SKP_Silk_decode_pitch( Ixs[ 0 ], Ixs[ 1 ], psDecCtrl->pitchL, psDec->fs_kHz );
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/********************/
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/* Decode LTP gains */
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/********************/
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/* Decode PERIndex value */
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SKP_Silk_range_decoder( &psDecCtrl->PERIndex, psRC, SKP_Silk_LTP_per_index_CDF,
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SKP_Silk_LTP_per_index_CDF_offset );
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/* Decode Codebook Index */
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cbk_ptr_Q14 = SKP_Silk_LTP_vq_ptrs_Q14[ psDecCtrl->PERIndex ]; // set pointer to start of codebook
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for( k = 0; k < NB_SUBFR; k++ ) {
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SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_LTP_gain_CDF_ptrs[ psDecCtrl->PERIndex ],
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SKP_Silk_LTP_gain_CDF_offsets[ psDecCtrl->PERIndex ] );
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for( i = 0; i < LTP_ORDER; i++ ) {
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psDecCtrl->LTPCoef_Q14[ SKP_SMULBB( k, LTP_ORDER ) + i ] = cbk_ptr_Q14[ SKP_SMULBB( Ix, LTP_ORDER ) + i ];
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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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SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_LTPscale_CDF, SKP_Silk_LTPscale_offset );
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psDecCtrl->LTP_scale_Q14 = SKP_Silk_LTPScales_table_Q14[ Ix ];
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} else {
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SKP_memset( psDecCtrl->pitchL, 0, NB_SUBFR * sizeof( SKP_int ) );
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SKP_memset( psDecCtrl->LTPCoef_Q14, 0, NB_SUBFR * LTP_ORDER * sizeof( SKP_int16 ) );
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psDecCtrl->PERIndex = 0;
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psDecCtrl->LTP_scale_Q14 = 0;
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}
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/***************/
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/* Decode seed */
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/***************/
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SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_Seed_CDF, SKP_Silk_Seed_offset );
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psDecCtrl->Seed = (SKP_int32)Ix;
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/*********************************************/
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/* Decode quantization indices of excitation */
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/*********************************************/
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SKP_Silk_decode_pulses( psRC, psDecCtrl, q, psDec->frame_length );
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/*********************************************/
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/* Decode VAD flag */
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/*********************************************/
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SKP_Silk_range_decoder( &psDec->vadFlag, psRC, SKP_Silk_vadflag_CDF, SKP_Silk_vadflag_offset );
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/**************************************/
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/* Decode Frame termination indicator */
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/**************************************/
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SKP_Silk_range_decoder( &psDec->FrameTermination, psRC, SKP_Silk_FrameTermination_CDF, SKP_Silk_FrameTermination_offset );
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/****************************************/
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/* get number of bytes used so far */
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/****************************************/
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SKP_Silk_range_coder_get_length( psRC, &nBytesUsed );
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psDec->nBytesLeft = psRC->bufferLength - nBytesUsed;
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if( psDec->nBytesLeft < 0 ) {
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psRC->error = RANGE_CODER_READ_BEYOND_BUFFER;
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}
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/****************************************/
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/* check remaining bits in last byte */
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/****************************************/
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if( psDec->nBytesLeft == 0 ) {
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SKP_Silk_range_coder_check_after_decoding( psRC );
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}
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}
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