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comparison: media/libopus/silk/decode_indices.c
media/libopus/silk/decode_indices.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:7fd0ea40579f |
|---|---|
| 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 } |
