Line data Source code
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 0 : 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 0 : if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
52 0 : Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
53 : } else {
54 0 : Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
55 : }
56 0 : psDec->indices.signalType = (opus_int8)silk_RSHIFT( Ix, 1 );
57 0 : psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
58 :
59 : /****************/
60 : /* Decode gains */
61 : /****************/
62 : /* First subframe */
63 0 : if( condCoding == CODE_CONDITIONALLY ) {
64 : /* Conditional coding */
65 0 : 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 0 : psDec->indices.GainsIndices[ 0 ] = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
69 0 : psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
70 : }
71 :
72 : /* Remaining subframes */
73 0 : for( i = 1; i < psDec->nb_subfr; i++ ) {
74 0 : psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
75 : }
76 :
77 : /**********************/
78 : /* Decode LSF Indices */
79 : /**********************/
80 0 : 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 0 : silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
82 0 : silk_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
83 0 : for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
84 0 : Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
85 0 : if( Ix == 0 ) {
86 0 : Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
87 0 : } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
88 0 : Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
89 : }
90 0 : psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
91 : }
92 :
93 : /* Decode LSF interpolation factor */
94 0 : if( psDec->nb_subfr == MAX_NB_SUBFR ) {
95 0 : psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
96 : } else {
97 0 : psDec->indices.NLSFInterpCoef_Q2 = 4;
98 : }
99 :
100 0 : if( psDec->indices.signalType == TYPE_VOICED )
101 : {
102 : /*********************/
103 : /* Decode pitch lags */
104 : /*********************/
105 : /* Get lag index */
106 0 : decode_absolute_lagIndex = 1;
107 0 : if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
108 : /* Decode Delta index */
109 0 : delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
110 0 : if( delta_lagIndex > 0 ) {
111 0 : delta_lagIndex = delta_lagIndex - 9;
112 0 : psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
113 0 : decode_absolute_lagIndex = 0;
114 : }
115 : }
116 0 : if( decode_absolute_lagIndex ) {
117 : /* Absolute decoding */
118 0 : psDec->indices.lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
119 0 : psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
120 : }
121 0 : psDec->ec_prevLagIndex = psDec->indices.lagIndex;
122 :
123 : /* Get countour index */
124 0 : 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 0 : psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
131 :
132 0 : for( k = 0; k < psDec->nb_subfr; k++ ) {
133 0 : 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 0 : if( condCoding == CODE_INDEPENDENTLY ) {
140 0 : psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
141 : } else {
142 0 : psDec->indices.LTP_scaleIndex = 0;
143 : }
144 : }
145 0 : psDec->ec_prevSignalType = psDec->indices.signalType;
146 :
147 : /***************/
148 : /* Decode seed */
149 : /***************/
150 0 : psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
151 0 : }
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