182 lines
9.1 KiB
C
182 lines
9.1 KiB
C
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/***********************************************************************
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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, are permitted provided that the following conditions
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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 Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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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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/* Encode side-information parameters to payload */
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void silk_encode_indices(
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silk_encoder_state *psEncC, /* I/O Encoder state */
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ec_enc *psRangeEnc, /* I/O Compressor data structure */
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opus_int FrameIndex, /* I Frame number */
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opus_int encode_LBRR, /* I Flag indicating LBRR data is being encoded */
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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, typeOffset;
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opus_int encode_absolute_lagIndex, delta_lagIndex;
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opus_int16 ec_ix[ MAX_LPC_ORDER ];
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opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
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const SideInfoIndices *psIndices;
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if( encode_LBRR ) {
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psIndices = &psEncC->indices_LBRR[ FrameIndex ];
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} else {
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psIndices = &psEncC->indices;
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}
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/*******************************************/
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/* Encode signal type and quantizer offset */
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/*******************************************/
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typeOffset = 2 * psIndices->signalType + psIndices->quantOffsetType;
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silk_assert( typeOffset >= 0 && typeOffset < 6 );
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silk_assert( encode_LBRR == 0 || typeOffset >= 2 );
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if( encode_LBRR || typeOffset >= 2 ) {
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ec_enc_icdf( psRangeEnc, typeOffset - 2, silk_type_offset_VAD_iCDF, 8 );
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} else {
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ec_enc_icdf( psRangeEnc, typeOffset, silk_type_offset_no_VAD_iCDF, 8 );
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}
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/****************/
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/* Encode gains */
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/****************/
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/* first subframe */
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if( condCoding == CODE_CONDITIONALLY ) {
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/* conditional coding */
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silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
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ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ], silk_delta_gain_iCDF, 8 );
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} else {
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/* independent coding, in two stages: MSB bits followed by 3 LSBs */
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silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < N_LEVELS_QGAIN );
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ec_enc_icdf( psRangeEnc, silk_RSHIFT( psIndices->GainsIndices[ 0 ], 3 ), silk_gain_iCDF[ psIndices->signalType ], 8 );
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ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ] & 7, silk_uniform8_iCDF, 8 );
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}
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/* remaining subframes */
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for( i = 1; i < psEncC->nb_subfr; i++ ) {
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silk_assert( psIndices->GainsIndices[ i ] >= 0 && psIndices->GainsIndices[ i ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
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ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ i ], silk_delta_gain_iCDF, 8 );
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}
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/****************/
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/* Encode NLSFs */
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/****************/
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ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ 0 ], &psEncC->psNLSF_CB->CB1_iCDF[ ( psIndices->signalType >> 1 ) * psEncC->psNLSF_CB->nVectors ], 8 );
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silk_NLSF_unpack( ec_ix, pred_Q8, psEncC->psNLSF_CB, psIndices->NLSFIndices[ 0 ] );
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silk_assert( psEncC->psNLSF_CB->order == psEncC->predictLPCOrder );
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for( i = 0; i < psEncC->psNLSF_CB->order; i++ ) {
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if( psIndices->NLSFIndices[ i+1 ] >= NLSF_QUANT_MAX_AMPLITUDE ) {
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ec_enc_icdf( psRangeEnc, 2 * NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
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ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
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} else if( psIndices->NLSFIndices[ i+1 ] <= -NLSF_QUANT_MAX_AMPLITUDE ) {
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ec_enc_icdf( psRangeEnc, 0, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
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ec_enc_icdf( psRangeEnc, -psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
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} else {
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ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] + NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
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}
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}
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/* Encode NLSF interpolation factor */
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if( psEncC->nb_subfr == MAX_NB_SUBFR ) {
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silk_assert( psIndices->NLSFInterpCoef_Q2 >= 0 && psIndices->NLSFInterpCoef_Q2 < 5 );
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ec_enc_icdf( psRangeEnc, psIndices->NLSFInterpCoef_Q2, silk_NLSF_interpolation_factor_iCDF, 8 );
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}
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if( psIndices->signalType == TYPE_VOICED )
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{
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/*********************/
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/* Encode pitch lags */
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/*********************/
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/* lag index */
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encode_absolute_lagIndex = 1;
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if( condCoding == CODE_CONDITIONALLY && psEncC->ec_prevSignalType == TYPE_VOICED ) {
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/* Delta Encoding */
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delta_lagIndex = psIndices->lagIndex - psEncC->ec_prevLagIndex;
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if( delta_lagIndex < -8 || delta_lagIndex > 11 ) {
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delta_lagIndex = 0;
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} else {
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delta_lagIndex = delta_lagIndex + 9;
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encode_absolute_lagIndex = 0; /* Only use delta */
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}
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silk_assert( delta_lagIndex >= 0 && delta_lagIndex < 21 );
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ec_enc_icdf( psRangeEnc, delta_lagIndex, silk_pitch_delta_iCDF, 8 );
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}
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if( encode_absolute_lagIndex ) {
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/* Absolute encoding */
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opus_int32 pitch_high_bits, pitch_low_bits;
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pitch_high_bits = silk_DIV32_16( psIndices->lagIndex, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
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pitch_low_bits = psIndices->lagIndex - silk_SMULBB( pitch_high_bits, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
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silk_assert( pitch_low_bits < psEncC->fs_kHz / 2 );
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silk_assert( pitch_high_bits < 32 );
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ec_enc_icdf( psRangeEnc, pitch_high_bits, silk_pitch_lag_iCDF, 8 );
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ec_enc_icdf( psRangeEnc, pitch_low_bits, psEncC->pitch_lag_low_bits_iCDF, 8 );
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}
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psEncC->ec_prevLagIndex = psIndices->lagIndex;
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/* Countour index */
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silk_assert( psIndices->contourIndex >= 0 );
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silk_assert( ( psIndices->contourIndex < 34 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 4 ) ||
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( psIndices->contourIndex < 11 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 4 ) ||
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( psIndices->contourIndex < 12 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 2 ) ||
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( psIndices->contourIndex < 3 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 2 ) );
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ec_enc_icdf( psRangeEnc, psIndices->contourIndex, psEncC->pitch_contour_iCDF, 8 );
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/********************/
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/* Encode LTP gains */
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/********************/
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/* PERIndex value */
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silk_assert( psIndices->PERIndex >= 0 && psIndices->PERIndex < 3 );
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ec_enc_icdf( psRangeEnc, psIndices->PERIndex, silk_LTP_per_index_iCDF, 8 );
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/* Codebook Indices */
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for( k = 0; k < psEncC->nb_subfr; k++ ) {
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silk_assert( psIndices->LTPIndex[ k ] >= 0 && psIndices->LTPIndex[ k ] < ( 8 << psIndices->PERIndex ) );
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ec_enc_icdf( psRangeEnc, psIndices->LTPIndex[ k ], silk_LTP_gain_iCDF_ptrs[ psIndices->PERIndex ], 8 );
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}
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/**********************/
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/* Encode LTP scaling */
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/**********************/
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if( condCoding == CODE_INDEPENDENTLY ) {
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silk_assert( psIndices->LTP_scaleIndex >= 0 && psIndices->LTP_scaleIndex < 3 );
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ec_enc_icdf( psRangeEnc, psIndices->LTP_scaleIndex, silk_LTPscale_iCDF, 8 );
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}
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silk_assert( !condCoding || psIndices->LTP_scaleIndex == 0 );
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}
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psEncC->ec_prevSignalType = psIndices->signalType;
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/***************/
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/* Encode seed */
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/***************/
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silk_assert( psIndices->Seed >= 0 && psIndices->Seed < 4 );
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ec_enc_icdf( psRangeEnc, psIndices->Seed, silk_uniform4_iCDF, 8 );
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}
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