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 /* Encode side-information parameters to payload */ 35 void silk_encode_indices( 36 silk_encoder_state *psEncC, /* I/O Encoder state */ 37 ec_enc *psRangeEnc, /* I/O Compressor data structure */ 38 opus_int FrameIndex, /* I Frame number */ 39 opus_int encode_LBRR, /* I Flag indicating LBRR data is being encoded */ 40 opus_int condCoding /* I The type of conditional coding to use */ 41 ) 42 { 43 opus_int i, k, typeOffset; 44 opus_int encode_absolute_lagIndex, delta_lagIndex; 45 opus_int16 ec_ix[ MAX_LPC_ORDER ]; 46 opus_uint8 pred_Q8[ MAX_LPC_ORDER ]; 47 const SideInfoIndices *psIndices; 48 49 if( encode_LBRR ) { 50 psIndices = &psEncC->indices_LBRR[ FrameIndex ]; 51 } else { 52 psIndices = &psEncC->indices; 53 } 54 55 /*******************************************/ 56 /* Encode signal type and quantizer offset */ 57 /*******************************************/ 58 typeOffset = 2 * psIndices->signalType + psIndices->quantOffsetType; 59 silk_assert( typeOffset >= 0 && typeOffset < 6 ); 60 silk_assert( encode_LBRR == 0 || typeOffset >= 2 ); 61 if( encode_LBRR || typeOffset >= 2 ) { 62 ec_enc_icdf( psRangeEnc, typeOffset - 2, silk_type_offset_VAD_iCDF, 8 ); 63 } else { 64 ec_enc_icdf( psRangeEnc, typeOffset, silk_type_offset_no_VAD_iCDF, 8 ); 65 } 66 67 /****************/ 68 /* Encode gains */ 69 /****************/ 70 /* first subframe */ 71 if( condCoding == CODE_CONDITIONALLY ) { 72 /* conditional coding */ 73 silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 ); 74 ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ], silk_delta_gain_iCDF, 8 ); 75 } else { 76 /* independent coding, in two stages: MSB bits followed by 3 LSBs */ 77 silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < N_LEVELS_QGAIN ); 78 ec_enc_icdf( psRangeEnc, silk_RSHIFT( psIndices->GainsIndices[ 0 ], 3 ), silk_gain_iCDF[ psIndices->signalType ], 8 ); 79 ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ] & 7, silk_uniform8_iCDF, 8 ); 80 } 81 82 /* remaining subframes */ 83 for( i = 1; i < psEncC->nb_subfr; i++ ) { 84 silk_assert( psIndices->GainsIndices[ i ] >= 0 && psIndices->GainsIndices[ i ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 ); 85 ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ i ], silk_delta_gain_iCDF, 8 ); 86 } 87 88 /****************/ 89 /* Encode NLSFs */ 90 /****************/ 91 ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ 0 ], &psEncC->psNLSF_CB->CB1_iCDF[ ( psIndices->signalType >> 1 ) * psEncC->psNLSF_CB->nVectors ], 8 ); 92 silk_NLSF_unpack( ec_ix, pred_Q8, psEncC->psNLSF_CB, psIndices->NLSFIndices[ 0 ] ); 93 silk_assert( psEncC->psNLSF_CB->order == psEncC->predictLPCOrder ); 94 for( i = 0; i < psEncC->psNLSF_CB->order; i++ ) { 95 if( psIndices->NLSFIndices[ i+1 ] >= NLSF_QUANT_MAX_AMPLITUDE ) { 96 ec_enc_icdf( psRangeEnc, 2 * NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 ); 97 ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 ); 98 } else if( psIndices->NLSFIndices[ i+1 ] <= -NLSF_QUANT_MAX_AMPLITUDE ) { 99 ec_enc_icdf( psRangeEnc, 0, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 ); 100 ec_enc_icdf( psRangeEnc, -psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 ); 101 } else { 102 ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] + NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 ); 103 } 104 } 105 106 /* Encode NLSF interpolation factor */ 107 if( psEncC->nb_subfr == MAX_NB_SUBFR ) { 108 silk_assert( psIndices->NLSFInterpCoef_Q2 >= 0 && psIndices->NLSFInterpCoef_Q2 < 5 ); 109 ec_enc_icdf( psRangeEnc, psIndices->NLSFInterpCoef_Q2, silk_NLSF_interpolation_factor_iCDF, 8 ); 110 } 111 112 if( psIndices->signalType == TYPE_VOICED ) 113 { 114 /*********************/ 115 /* Encode pitch lags */ 116 /*********************/ 117 /* lag index */ 118 encode_absolute_lagIndex = 1; 119 if( condCoding == CODE_CONDITIONALLY && psEncC->ec_prevSignalType == TYPE_VOICED ) { 120 /* Delta Encoding */ 121 delta_lagIndex = psIndices->lagIndex - psEncC->ec_prevLagIndex; 122 if( delta_lagIndex < -8 || delta_lagIndex > 11 ) { 123 delta_lagIndex = 0; 124 } else { 125 delta_lagIndex = delta_lagIndex + 9; 126 encode_absolute_lagIndex = 0; /* Only use delta */ 127 } 128 silk_assert( delta_lagIndex >= 0 && delta_lagIndex < 21 ); 129 ec_enc_icdf( psRangeEnc, delta_lagIndex, silk_pitch_delta_iCDF, 8 ); 130 } 131 if( encode_absolute_lagIndex ) { 132 /* Absolute encoding */ 133 opus_int32 pitch_high_bits, pitch_low_bits; 134 pitch_high_bits = silk_DIV32_16( psIndices->lagIndex, silk_RSHIFT( psEncC->fs_kHz, 1 ) ); 135 pitch_low_bits = psIndices->lagIndex - silk_SMULBB( pitch_high_bits, silk_RSHIFT( psEncC->fs_kHz, 1 ) ); 136 silk_assert( pitch_low_bits < psEncC->fs_kHz / 2 ); 137 silk_assert( pitch_high_bits < 32 ); 138 ec_enc_icdf( psRangeEnc, pitch_high_bits, silk_pitch_lag_iCDF, 8 ); 139 ec_enc_icdf( psRangeEnc, pitch_low_bits, psEncC->pitch_lag_low_bits_iCDF, 8 ); 140 } 141 psEncC->ec_prevLagIndex = psIndices->lagIndex; 142 143 /* Countour index */ 144 silk_assert( psIndices->contourIndex >= 0 ); 145 silk_assert( ( psIndices->contourIndex < 34 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 4 ) || 146 ( psIndices->contourIndex < 11 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 4 ) || 147 ( psIndices->contourIndex < 12 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 2 ) || 148 ( psIndices->contourIndex < 3 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 2 ) ); 149 ec_enc_icdf( psRangeEnc, psIndices->contourIndex, psEncC->pitch_contour_iCDF, 8 ); 150 151 /********************/ 152 /* Encode LTP gains */ 153 /********************/ 154 /* PERIndex value */ 155 silk_assert( psIndices->PERIndex >= 0 && psIndices->PERIndex < 3 ); 156 ec_enc_icdf( psRangeEnc, psIndices->PERIndex, silk_LTP_per_index_iCDF, 8 ); 157 158 /* Codebook Indices */ 159 for( k = 0; k < psEncC->nb_subfr; k++ ) { 160 silk_assert( psIndices->LTPIndex[ k ] >= 0 && psIndices->LTPIndex[ k ] < ( 8 << psIndices->PERIndex ) ); 161 ec_enc_icdf( psRangeEnc, psIndices->LTPIndex[ k ], silk_LTP_gain_iCDF_ptrs[ psIndices->PERIndex ], 8 ); 162 } 163 164 /**********************/ 165 /* Encode LTP scaling */ 166 /**********************/ 167 if( condCoding == CODE_INDEPENDENTLY ) { 168 silk_assert( psIndices->LTP_scaleIndex >= 0 && psIndices->LTP_scaleIndex < 3 ); 169 ec_enc_icdf( psRangeEnc, psIndices->LTP_scaleIndex, silk_LTPscale_iCDF, 8 ); 170 } 171 silk_assert( !condCoding || psIndices->LTP_scaleIndex == 0 ); 172 } 173 174 psEncC->ec_prevSignalType = psIndices->signalType; 175 176 /***************/ 177 /* Encode seed */ 178 /***************/ 179 silk_assert( psIndices->Seed >= 0 && psIndices->Seed < 4 ); 180 ec_enc_icdf( psRangeEnc, psIndices->Seed, silk_uniform4_iCDF, 8 ); 181 } 182
