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annotate src/opus-1.3/silk/decode_indices.c @ 84:08ae793730bd

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Add null config files
author Chris Cannam
date Mon, 02 Mar 2020 14:03:47 +0000
parents 7aeed7906520
children
rev   line source
Chris@69 1 /***********************************************************************
Chris@69 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69 3 Redistribution and use in source and binary forms, with or without
Chris@69 4 modification, are permitted provided that the following conditions
Chris@69 5 are met:
Chris@69 6 - Redistributions of source code must retain the above copyright notice,
Chris@69 7 this list of conditions and the following disclaimer.
Chris@69 8 - Redistributions in binary form must reproduce the above copyright
Chris@69 9 notice, this list of conditions and the following disclaimer in the
Chris@69 10 documentation and/or other materials provided with the distribution.
Chris@69 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69 12 names of specific contributors, may be used to endorse or promote
Chris@69 13 products derived from this software without specific prior written
Chris@69 14 permission.
Chris@69 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69 25 POSSIBILITY OF SUCH DAMAGE.
Chris@69 26 ***********************************************************************/
Chris@69 27
Chris@69 28 #ifdef HAVE_CONFIG_H
Chris@69 29 #include "config.h"
Chris@69 30 #endif
Chris@69 31
Chris@69 32 #include "main.h"
Chris@69 33
Chris@69 34 /* Decode side-information parameters from payload */
Chris@69 35 void silk_decode_indices(
Chris@69 36 silk_decoder_state *psDec, /* I/O State */
Chris@69 37 ec_dec *psRangeDec, /* I/O Compressor data structure */
Chris@69 38 opus_int FrameIndex, /* I Frame number */
Chris@69 39 opus_int decode_LBRR, /* I Flag indicating LBRR data is being decoded */
Chris@69 40 opus_int condCoding /* I The type of conditional coding to use */
Chris@69 41 )
Chris@69 42 {
Chris@69 43 opus_int i, k, Ix;
Chris@69 44 opus_int decode_absolute_lagIndex, delta_lagIndex;
Chris@69 45 opus_int16 ec_ix[ MAX_LPC_ORDER ];
Chris@69 46 opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
Chris@69 47
Chris@69 48 /*******************************************/
Chris@69 49 /* Decode signal type and quantizer offset */
Chris@69 50 /*******************************************/
Chris@69 51 if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
Chris@69 52 Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
Chris@69 53 } else {
Chris@69 54 Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
Chris@69 55 }
Chris@69 56 psDec->indices.signalType = (opus_int8)silk_RSHIFT( Ix, 1 );
Chris@69 57 psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
Chris@69 58
Chris@69 59 /****************/
Chris@69 60 /* Decode gains */
Chris@69 61 /****************/
Chris@69 62 /* First subframe */
Chris@69 63 if( condCoding == CODE_CONDITIONALLY ) {
Chris@69 64 /* Conditional coding */
Chris@69 65 psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
Chris@69 66 } else {
Chris@69 67 /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
Chris@69 68 psDec->indices.GainsIndices[ 0 ] = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
Chris@69 69 psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
Chris@69 70 }
Chris@69 71
Chris@69 72 /* Remaining subframes */
Chris@69 73 for( i = 1; i < psDec->nb_subfr; i++ ) {
Chris@69 74 psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
Chris@69 75 }
Chris@69 76
Chris@69 77 /**********************/
Chris@69 78 /* Decode LSF Indices */
Chris@69 79 /**********************/
Chris@69 80 psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
Chris@69 81 silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
Chris@69 82 celt_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
Chris@69 83 for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
Chris@69 84 Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
Chris@69 85 if( Ix == 0 ) {
Chris@69 86 Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
Chris@69 87 } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
Chris@69 88 Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
Chris@69 89 }
Chris@69 90 psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
Chris@69 91 }
Chris@69 92
Chris@69 93 /* Decode LSF interpolation factor */
Chris@69 94 if( psDec->nb_subfr == MAX_NB_SUBFR ) {
Chris@69 95 psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
Chris@69 96 } else {
Chris@69 97 psDec->indices.NLSFInterpCoef_Q2 = 4;
Chris@69 98 }
Chris@69 99
Chris@69 100 if( psDec->indices.signalType == TYPE_VOICED )
Chris@69 101 {
Chris@69 102 /*********************/
Chris@69 103 /* Decode pitch lags */
Chris@69 104 /*********************/
Chris@69 105 /* Get lag index */
Chris@69 106 decode_absolute_lagIndex = 1;
Chris@69 107 if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
Chris@69 108 /* Decode Delta index */
Chris@69 109 delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
Chris@69 110 if( delta_lagIndex > 0 ) {
Chris@69 111 delta_lagIndex = delta_lagIndex - 9;
Chris@69 112 psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
Chris@69 113 decode_absolute_lagIndex = 0;
Chris@69 114 }
Chris@69 115 }
Chris@69 116 if( decode_absolute_lagIndex ) {
Chris@69 117 /* Absolute decoding */
Chris@69 118 psDec->indices.lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
Chris@69 119 psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
Chris@69 120 }
Chris@69 121 psDec->ec_prevLagIndex = psDec->indices.lagIndex;
Chris@69 122
Chris@69 123 /* Get countour index */
Chris@69 124 psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
Chris@69 125
Chris@69 126 /********************/
Chris@69 127 /* Decode LTP gains */
Chris@69 128 /********************/
Chris@69 129 /* Decode PERIndex value */
Chris@69 130 psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
Chris@69 131
Chris@69 132 for( k = 0; k < psDec->nb_subfr; k++ ) {
Chris@69 133 psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
Chris@69 134 }
Chris@69 135
Chris@69 136 /**********************/
Chris@69 137 /* Decode LTP scaling */
Chris@69 138 /**********************/
Chris@69 139 if( condCoding == CODE_INDEPENDENTLY ) {
Chris@69 140 psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
Chris@69 141 } else {
Chris@69 142 psDec->indices.LTP_scaleIndex = 0;
Chris@69 143 }
Chris@69 144 }
Chris@69 145 psDec->ec_prevSignalType = psDec->indices.signalType;
Chris@69 146
Chris@69 147 /***************/
Chris@69 148 /* Decode seed */
Chris@69 149 /***************/
Chris@69 150 psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
Chris@69 151 }