1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/decode_indices.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,151 @@
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 side-information parameters from payload */
1.38 +void silk_decode_indices(
1.39 + silk_decoder_state *psDec, /* I/O State */
1.40 + ec_dec *psRangeDec, /* I/O Compressor data structure */
1.41 + opus_int FrameIndex, /* I Frame number */
1.42 + opus_int decode_LBRR, /* I Flag indicating LBRR data is being decoded */
1.43 + opus_int condCoding /* I The type of conditional coding to use */
1.44 +)
1.45 +{
1.46 + opus_int i, k, Ix;
1.47 + opus_int decode_absolute_lagIndex, delta_lagIndex;
1.48 + opus_int16 ec_ix[ MAX_LPC_ORDER ];
1.49 + opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
1.50 +
1.51 + /*******************************************/
1.52 + /* Decode signal type and quantizer offset */
1.53 + /*******************************************/
1.54 + if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
1.55 + Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
1.56 + } else {
1.57 + Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
1.58 + }
1.59 + psDec->indices.signalType = (opus_int8)silk_RSHIFT( Ix, 1 );
1.60 + psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
1.61 +
1.62 + /****************/
1.63 + /* Decode gains */
1.64 + /****************/
1.65 + /* First subframe */
1.66 + if( condCoding == CODE_CONDITIONALLY ) {
1.67 + /* Conditional coding */
1.68 + psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
1.69 + } else {
1.70 + /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
1.71 + psDec->indices.GainsIndices[ 0 ] = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
1.72 + psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
1.73 + }
1.74 +
1.75 + /* Remaining subframes */
1.76 + for( i = 1; i < psDec->nb_subfr; i++ ) {
1.77 + psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
1.78 + }
1.79 +
1.80 + /**********************/
1.81 + /* Decode LSF Indices */
1.82 + /**********************/
1.83 + psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
1.84 + silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
1.85 + silk_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
1.86 + for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
1.87 + Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
1.88 + if( Ix == 0 ) {
1.89 + Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
1.90 + } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
1.91 + Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
1.92 + }
1.93 + psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
1.94 + }
1.95 +
1.96 + /* Decode LSF interpolation factor */
1.97 + if( psDec->nb_subfr == MAX_NB_SUBFR ) {
1.98 + psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
1.99 + } else {
1.100 + psDec->indices.NLSFInterpCoef_Q2 = 4;
1.101 + }
1.102 +
1.103 + if( psDec->indices.signalType == TYPE_VOICED )
1.104 + {
1.105 + /*********************/
1.106 + /* Decode pitch lags */
1.107 + /*********************/
1.108 + /* Get lag index */
1.109 + decode_absolute_lagIndex = 1;
1.110 + if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
1.111 + /* Decode Delta index */
1.112 + delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
1.113 + if( delta_lagIndex > 0 ) {
1.114 + delta_lagIndex = delta_lagIndex - 9;
1.115 + psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
1.116 + decode_absolute_lagIndex = 0;
1.117 + }
1.118 + }
1.119 + if( decode_absolute_lagIndex ) {
1.120 + /* Absolute decoding */
1.121 + psDec->indices.lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
1.122 + psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
1.123 + }
1.124 + psDec->ec_prevLagIndex = psDec->indices.lagIndex;
1.125 +
1.126 + /* Get countour index */
1.127 + psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
1.128 +
1.129 + /********************/
1.130 + /* Decode LTP gains */
1.131 + /********************/
1.132 + /* Decode PERIndex value */
1.133 + psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
1.134 +
1.135 + for( k = 0; k < psDec->nb_subfr; k++ ) {
1.136 + psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
1.137 + }
1.138 +
1.139 + /**********************/
1.140 + /* Decode LTP scaling */
1.141 + /**********************/
1.142 + if( condCoding == CODE_INDEPENDENTLY ) {
1.143 + psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
1.144 + } else {
1.145 + psDec->indices.LTP_scaleIndex = 0;
1.146 + }
1.147 + }
1.148 + psDec->ec_prevSignalType = psDec->indices.signalType;
1.149 +
1.150 + /***************/
1.151 + /* Decode seed */
1.152 + /***************/
1.153 + psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
1.154 +}
