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 : /*********************************************/
35 : /* Decode quantization indices of excitation */
36 : /*********************************************/
37 0 : void silk_decode_pulses(
38 : ec_dec *psRangeDec, /* I/O Compressor data structure */
39 : opus_int16 pulses[], /* O Excitation signal */
40 : const opus_int signalType, /* I Sigtype */
41 : const opus_int quantOffsetType, /* I quantOffsetType */
42 : const opus_int frame_length /* I Frame length */
43 : )
44 : {
45 : opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex;
46 : opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ];
47 : opus_int16 *pulses_ptr;
48 : const opus_uint8 *cdf_ptr;
49 :
50 : /*********************/
51 : /* Decode rate level */
52 : /*********************/
53 0 : RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
54 :
55 : /* Calculate number of shell blocks */
56 : silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
57 0 : iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
58 0 : if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
59 0 : silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
60 0 : iter++;
61 : }
62 :
63 : /***************************************************/
64 : /* Sum-Weighted-Pulses Decoding */
65 : /***************************************************/
66 0 : cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
67 0 : for( i = 0; i < iter; i++ ) {
68 0 : nLshifts[ i ] = 0;
69 0 : sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 );
70 :
71 : /* LSB indication */
72 0 : while( sum_pulses[ i ] == SILK_MAX_PULSES + 1 ) {
73 0 : nLshifts[ i ]++;
74 : /* When we've already got 10 LSBs, we shift the table to not allow (SILK_MAX_PULSES + 1) */
75 0 : sum_pulses[ i ] = ec_dec_icdf( psRangeDec,
76 0 : silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 );
77 : }
78 : }
79 :
80 : /***************************************************/
81 : /* Shell decoding */
82 : /***************************************************/
83 0 : for( i = 0; i < iter; i++ ) {
84 0 : if( sum_pulses[ i ] > 0 ) {
85 0 : silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] );
86 : } else {
87 0 : silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( pulses[0] ) );
88 : }
89 : }
90 :
91 : /***************************************************/
92 : /* LSB Decoding */
93 : /***************************************************/
94 0 : for( i = 0; i < iter; i++ ) {
95 0 : if( nLshifts[ i ] > 0 ) {
96 0 : nLS = nLshifts[ i ];
97 0 : pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ];
98 0 : for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
99 0 : abs_q = pulses_ptr[ k ];
100 0 : for( j = 0; j < nLS; j++ ) {
101 0 : abs_q = silk_LSHIFT( abs_q, 1 );
102 0 : abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 );
103 : }
104 0 : pulses_ptr[ k ] = abs_q;
105 : }
106 : /* Mark the number of pulses non-zero for sign decoding. */
107 0 : sum_pulses[ i ] |= nLS << 5;
108 : }
109 : }
110 :
111 : /****************************************/
112 : /* Decode and add signs to pulse signal */
113 : /****************************************/
114 0 : silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
115 0 : }
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