Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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 | } |