1 /*********************************************************************** 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3 Redistribution and use in source and binary forms, with or without 4 modification, are permitted provided that the following conditions 5 are met: 6 - Redistributions of source code must retain the above copyright notice, 7 this list of conditions and the following disclaimer. 8 - Redistributions in binary form must reproduce the above copyright 9 notice, this list of conditions and the following disclaimer in the 10 documentation and/or other materials provided with the distribution. 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the 12 names of specific contributors, may be used to endorse or promote 13 products derived from this software without specific prior written 14 permission. 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 POSSIBILITY OF SUCH DAMAGE. 26 ***********************************************************************/ 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include "main.h" 33 34 /* Decode side-information parameters from payload */ 35 void silk_decode_indices( 36 silk_decoder_state *psDec, /* I/O State */ 37 ec_dec *psRangeDec, /* I/O Compressor data structure */ 38 opus_int FrameIndex, /* I Frame number */ 39 opus_int decode_LBRR, /* I Flag indicating LBRR data is being decoded */ 40 opus_int condCoding /* I The type of conditional coding to use */ 41 ) 42 { 43 opus_int i, k, Ix; 44 opus_int decode_absolute_lagIndex, delta_lagIndex; 45 opus_int16 ec_ix[ MAX_LPC_ORDER ]; 46 opus_uint8 pred_Q8[ MAX_LPC_ORDER ]; 47 48 /*******************************************/ 49 /* Decode signal type and quantizer offset */ 50 /*******************************************/ 51 if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) { 52 Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2; 53 } else { 54 Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 ); 55 } 56 psDec->indices.signalType = (opus_int8)silk_RSHIFT( Ix, 1 ); 57 psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 ); 58 59 /****************/ 60 /* Decode gains */ 61 /****************/ 62 /* First subframe */ 63 if( condCoding == CODE_CONDITIONALLY ) { 64 /* Conditional coding */ 65 psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 ); 66 } else { 67 /* Independent coding, in two stages: MSB bits followed by 3 LSBs */ 68 psDec->indices.GainsIndices[ 0 ] = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 ); 69 psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 ); 70 } 71 72 /* Remaining subframes */ 73 for( i = 1; i < psDec->nb_subfr; i++ ) { 74 psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 ); 75 } 76 77 /**********************/ 78 /* Decode LSF Indices */ 79 /**********************/ 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 ); 81 silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] ); 82 silk_assert( psDec->psNLSF_CB->order == psDec->LPC_order ); 83 for( i = 0; i < psDec->psNLSF_CB->order; i++ ) { 84 Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 ); 85 if( Ix == 0 ) { 86 Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 ); 87 } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) { 88 Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 ); 89 } 90 psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE ); 91 } 92 93 /* Decode LSF interpolation factor */ 94 if( psDec->nb_subfr == MAX_NB_SUBFR ) { 95 psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 ); 96 } else { 97 psDec->indices.NLSFInterpCoef_Q2 = 4; 98 } 99 100 if( psDec->indices.signalType == TYPE_VOICED ) 101 { 102 /*********************/ 103 /* Decode pitch lags */ 104 /*********************/ 105 /* Get lag index */ 106 decode_absolute_lagIndex = 1; 107 if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) { 108 /* Decode Delta index */ 109 delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 ); 110 if( delta_lagIndex > 0 ) { 111 delta_lagIndex = delta_lagIndex - 9; 112 psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex ); 113 decode_absolute_lagIndex = 0; 114 } 115 } 116 if( decode_absolute_lagIndex ) { 117 /* Absolute decoding */ 118 psDec->indices.lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 ); 119 psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 ); 120 } 121 psDec->ec_prevLagIndex = psDec->indices.lagIndex; 122 123 /* Get countour index */ 124 psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 ); 125 126 /********************/ 127 /* Decode LTP gains */ 128 /********************/ 129 /* Decode PERIndex value */ 130 psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 ); 131 132 for( k = 0; k < psDec->nb_subfr; k++ ) { 133 psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 ); 134 } 135 136 /**********************/ 137 /* Decode LTP scaling */ 138 /**********************/ 139 if( condCoding == CODE_INDEPENDENTLY ) { 140 psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 ); 141 } else { 142 psDec->indices.LTP_scaleIndex = 0; 143 } 144 } 145 psDec->ec_prevSignalType = psDec->indices.signalType; 146 147 /***************/ 148 /* Decode seed */ 149 /***************/ 150 psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 ); 151 } 152
