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media/libopus/silk/encode_indices.c@b8a032363ba2 (annotated)

media/libopus/silk/encode_indices.c

Thu, 22 Jan 2015 13:21:57 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 22 Jan 2015 13:21:57 +0100
branch
TOR_BUG_9701
changeset 15
b8a032363ba2
permissions
-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0 1 /***********************************************************************
michael@0 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0 3 Redistribution and use in source and binary forms, with or without
michael@0 4 modification, are permitted provided that the following conditions
michael@0 5 are met:
michael@0 6 - Redistributions of source code must retain the above copyright notice,
michael@0 7 this list of conditions and the following disclaimer.
michael@0 8 - Redistributions in binary form must reproduce the above copyright
michael@0 9 notice, this list of conditions and the following disclaimer in the
michael@0 10 documentation and/or other materials provided with the distribution.
michael@0 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0 12 names of specific contributors, may be used to endorse or promote
michael@0 13 products derived from this software without specific prior written
michael@0 14 permission.
michael@0 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0 25 POSSIBILITY OF SUCH DAMAGE.
michael@0 26 ***********************************************************************/
michael@0 27
michael@0 28 #ifdef HAVE_CONFIG_H
michael@0 29 #include "config.h"
michael@0 30 #endif
michael@0 31
michael@0 32 #include "main.h"
michael@0 33
michael@0 34 /* Encode side-information parameters to payload */
michael@0 35 void silk_encode_indices(
michael@0 36 silk_encoder_state *psEncC, /* I/O Encoder state */
michael@0 37 ec_enc *psRangeEnc, /* I/O Compressor data structure */
michael@0 38 opus_int FrameIndex, /* I Frame number */
michael@0 39 opus_int encode_LBRR, /* I Flag indicating LBRR data is being encoded */
michael@0 40 opus_int condCoding /* I The type of conditional coding to use */
michael@0 41 )
michael@0 42 {
michael@0 43 opus_int i, k, typeOffset;
michael@0 44 opus_int encode_absolute_lagIndex, delta_lagIndex;
michael@0 45 opus_int16 ec_ix[ MAX_LPC_ORDER ];
michael@0 46 opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
michael@0 47 const SideInfoIndices *psIndices;
michael@0 48
michael@0 49 if( encode_LBRR ) {
michael@0 50 psIndices = &psEncC->indices_LBRR[ FrameIndex ];
michael@0 51 } else {
michael@0 52 psIndices = &psEncC->indices;
michael@0 53 }
michael@0 54
michael@0 55 /*******************************************/
michael@0 56 /* Encode signal type and quantizer offset */
michael@0 57 /*******************************************/
michael@0 58 typeOffset = 2 * psIndices->signalType + psIndices->quantOffsetType;
michael@0 59 silk_assert( typeOffset >= 0 && typeOffset < 6 );
michael@0 60 silk_assert( encode_LBRR == 0 || typeOffset >= 2 );
michael@0 61 if( encode_LBRR || typeOffset >= 2 ) {
michael@0 62 ec_enc_icdf( psRangeEnc, typeOffset - 2, silk_type_offset_VAD_iCDF, 8 );
michael@0 63 } else {
michael@0 64 ec_enc_icdf( psRangeEnc, typeOffset, silk_type_offset_no_VAD_iCDF, 8 );
michael@0 65 }
michael@0 66
michael@0 67 /****************/
michael@0 68 /* Encode gains */
michael@0 69 /****************/
michael@0 70 /* first subframe */
michael@0 71 if( condCoding == CODE_CONDITIONALLY ) {
michael@0 72 /* conditional coding */
michael@0 73 silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
michael@0 74 ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ], silk_delta_gain_iCDF, 8 );
michael@0 75 } else {
michael@0 76 /* independent coding, in two stages: MSB bits followed by 3 LSBs */
michael@0 77 silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < N_LEVELS_QGAIN );
michael@0 78 ec_enc_icdf( psRangeEnc, silk_RSHIFT( psIndices->GainsIndices[ 0 ], 3 ), silk_gain_iCDF[ psIndices->signalType ], 8 );
michael@0 79 ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ] & 7, silk_uniform8_iCDF, 8 );
michael@0 80 }
michael@0 81
michael@0 82 /* remaining subframes */
michael@0 83 for( i = 1; i < psEncC->nb_subfr; i++ ) {
michael@0 84 silk_assert( psIndices->GainsIndices[ i ] >= 0 && psIndices->GainsIndices[ i ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
michael@0 85 ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ i ], silk_delta_gain_iCDF, 8 );
michael@0 86 }
michael@0 87
michael@0 88 /****************/
michael@0 89 /* Encode NLSFs */
michael@0 90 /****************/
michael@0 91 ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ 0 ], &psEncC->psNLSF_CB->CB1_iCDF[ ( psIndices->signalType >> 1 ) * psEncC->psNLSF_CB->nVectors ], 8 );
michael@0 92 silk_NLSF_unpack( ec_ix, pred_Q8, psEncC->psNLSF_CB, psIndices->NLSFIndices[ 0 ] );
michael@0 93 silk_assert( psEncC->psNLSF_CB->order == psEncC->predictLPCOrder );
michael@0 94 for( i = 0; i < psEncC->psNLSF_CB->order; i++ ) {
michael@0 95 if( psIndices->NLSFIndices[ i+1 ] >= NLSF_QUANT_MAX_AMPLITUDE ) {
michael@0 96 ec_enc_icdf( psRangeEnc, 2 * NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
michael@0 97 ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
michael@0 98 } else if( psIndices->NLSFIndices[ i+1 ] <= -NLSF_QUANT_MAX_AMPLITUDE ) {
michael@0 99 ec_enc_icdf( psRangeEnc, 0, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
michael@0 100 ec_enc_icdf( psRangeEnc, -psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
michael@0 101 } else {
michael@0 102 ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] + NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
michael@0 103 }
michael@0 104 }
michael@0 105
michael@0 106 /* Encode NLSF interpolation factor */
michael@0 107 if( psEncC->nb_subfr == MAX_NB_SUBFR ) {
michael@0 108 silk_assert( psIndices->NLSFInterpCoef_Q2 >= 0 && psIndices->NLSFInterpCoef_Q2 < 5 );
michael@0 109 ec_enc_icdf( psRangeEnc, psIndices->NLSFInterpCoef_Q2, silk_NLSF_interpolation_factor_iCDF, 8 );
michael@0 110 }
michael@0 111
michael@0 112 if( psIndices->signalType == TYPE_VOICED )
michael@0 113 {
michael@0 114 /*********************/
michael@0 115 /* Encode pitch lags */
michael@0 116 /*********************/
michael@0 117 /* lag index */
michael@0 118 encode_absolute_lagIndex = 1;
michael@0 119 if( condCoding == CODE_CONDITIONALLY && psEncC->ec_prevSignalType == TYPE_VOICED ) {
michael@0 120 /* Delta Encoding */
michael@0 121 delta_lagIndex = psIndices->lagIndex - psEncC->ec_prevLagIndex;
michael@0 122 if( delta_lagIndex < -8 || delta_lagIndex > 11 ) {
michael@0 123 delta_lagIndex = 0;
michael@0 124 } else {
michael@0 125 delta_lagIndex = delta_lagIndex + 9;
michael@0 126 encode_absolute_lagIndex = 0; /* Only use delta */
michael@0 127 }
michael@0 128 silk_assert( delta_lagIndex >= 0 && delta_lagIndex < 21 );
michael@0 129 ec_enc_icdf( psRangeEnc, delta_lagIndex, silk_pitch_delta_iCDF, 8 );
michael@0 130 }
michael@0 131 if( encode_absolute_lagIndex ) {
michael@0 132 /* Absolute encoding */
michael@0 133 opus_int32 pitch_high_bits, pitch_low_bits;
michael@0 134 pitch_high_bits = silk_DIV32_16( psIndices->lagIndex, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
michael@0 135 pitch_low_bits = psIndices->lagIndex - silk_SMULBB( pitch_high_bits, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
michael@0 136 silk_assert( pitch_low_bits < psEncC->fs_kHz / 2 );
michael@0 137 silk_assert( pitch_high_bits < 32 );
michael@0 138 ec_enc_icdf( psRangeEnc, pitch_high_bits, silk_pitch_lag_iCDF, 8 );
michael@0 139 ec_enc_icdf( psRangeEnc, pitch_low_bits, psEncC->pitch_lag_low_bits_iCDF, 8 );
michael@0 140 }
michael@0 141 psEncC->ec_prevLagIndex = psIndices->lagIndex;
michael@0 142
michael@0 143 /* Countour index */
michael@0 144 silk_assert( psIndices->contourIndex >= 0 );
michael@0 145 silk_assert( ( psIndices->contourIndex < 34 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 4 ) ||
michael@0 146 ( psIndices->contourIndex < 11 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 4 ) ||
michael@0 147 ( psIndices->contourIndex < 12 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 2 ) ||
michael@0 148 ( psIndices->contourIndex < 3 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 2 ) );
michael@0 149 ec_enc_icdf( psRangeEnc, psIndices->contourIndex, psEncC->pitch_contour_iCDF, 8 );
michael@0 150
michael@0 151 /********************/
michael@0 152 /* Encode LTP gains */
michael@0 153 /********************/
michael@0 154 /* PERIndex value */
michael@0 155 silk_assert( psIndices->PERIndex >= 0 && psIndices->PERIndex < 3 );
michael@0 156 ec_enc_icdf( psRangeEnc, psIndices->PERIndex, silk_LTP_per_index_iCDF, 8 );
michael@0 157
michael@0 158 /* Codebook Indices */
michael@0 159 for( k = 0; k < psEncC->nb_subfr; k++ ) {
michael@0 160 silk_assert( psIndices->LTPIndex[ k ] >= 0 && psIndices->LTPIndex[ k ] < ( 8 << psIndices->PERIndex ) );
michael@0 161 ec_enc_icdf( psRangeEnc, psIndices->LTPIndex[ k ], silk_LTP_gain_iCDF_ptrs[ psIndices->PERIndex ], 8 );
michael@0 162 }
michael@0 163
michael@0 164 /**********************/
michael@0 165 /* Encode LTP scaling */
michael@0 166 /**********************/
michael@0 167 if( condCoding == CODE_INDEPENDENTLY ) {
michael@0 168 silk_assert( psIndices->LTP_scaleIndex >= 0 && psIndices->LTP_scaleIndex < 3 );
michael@0 169 ec_enc_icdf( psRangeEnc, psIndices->LTP_scaleIndex, silk_LTPscale_iCDF, 8 );
michael@0 170 }
michael@0 171 silk_assert( !condCoding || psIndices->LTP_scaleIndex == 0 );
michael@0 172 }
michael@0 173
michael@0 174 psEncC->ec_prevSignalType = psIndices->signalType;
michael@0 175
michael@0 176 /***************/
michael@0 177 /* Encode seed */
michael@0 178 /***************/
michael@0 179 silk_assert( psIndices->Seed >= 0 && psIndices->Seed < 4 );
michael@0 180 ec_enc_icdf( psRangeEnc, psIndices->Seed, silk_uniform4_iCDF, 8 );
michael@0 181 }

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