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 : /*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/
35 : /*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/
36 : /* shifting avoids if-statement */
37 : #define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 )
38 : #define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 )
39 :
40 : /* Encodes signs of excitation */
41 0 : void silk_encode_signs(
42 : ec_enc *psRangeEnc, /* I/O Compressor data structure */
43 : const opus_int8 pulses[], /* I pulse signal */
44 : opus_int length, /* I length of input */
45 : const opus_int signalType, /* I Signal type */
46 : const opus_int quantOffsetType, /* I Quantization offset type */
47 : const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
48 : )
49 : {
50 : opus_int i, j, p;
51 : opus_uint8 icdf[ 2 ];
52 : const opus_int8 *q_ptr;
53 : const opus_uint8 *icdf_ptr;
54 :
55 0 : icdf[ 1 ] = 0;
56 0 : q_ptr = pulses;
57 0 : i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
58 0 : icdf_ptr = &silk_sign_iCDF[ i ];
59 0 : length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
60 0 : for( i = 0; i < length; i++ ) {
61 0 : p = sum_pulses[ i ];
62 0 : if( p > 0 ) {
63 0 : icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
64 0 : for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
65 0 : if( q_ptr[ j ] != 0 ) {
66 0 : ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 );
67 : }
68 : }
69 : }
70 0 : q_ptr += SHELL_CODEC_FRAME_LENGTH;
71 : }
72 0 : }
73 :
74 : /* Decodes signs of excitation */
75 0 : void silk_decode_signs(
76 : ec_dec *psRangeDec, /* I/O Compressor data structure */
77 : opus_int16 pulses[], /* I/O pulse signal */
78 : opus_int length, /* I length of input */
79 : const opus_int signalType, /* I Signal type */
80 : const opus_int quantOffsetType, /* I Quantization offset type */
81 : const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
82 : )
83 : {
84 : opus_int i, j, p;
85 : opus_uint8 icdf[ 2 ];
86 : opus_int16 *q_ptr;
87 : const opus_uint8 *icdf_ptr;
88 :
89 0 : icdf[ 1 ] = 0;
90 0 : q_ptr = pulses;
91 0 : i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
92 0 : icdf_ptr = &silk_sign_iCDF[ i ];
93 0 : length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
94 0 : for( i = 0; i < length; i++ ) {
95 0 : p = sum_pulses[ i ];
96 0 : if( p > 0 ) {
97 0 : icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
98 0 : for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
99 0 : if( q_ptr[ j ] > 0 ) {
100 : /* attach sign */
101 : #if 0
102 : /* conditional implementation */
103 : if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) {
104 : q_ptr[ j ] = -q_ptr[ j ];
105 : }
106 : #else
107 : /* implementation with shift, subtraction, multiplication */
108 0 : q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) );
109 : #endif
110 : }
111 : }
112 : }
113 0 : q_ptr += SHELL_CODEC_FRAME_LENGTH;
114 : }
115 0 : }
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