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 */
silk_encode_signs(ec_enc * psRangeEnc,const opus_int8 pulses[],opus_int length,const opus_int signalType,const opus_int quantOffsetType,const opus_int sum_pulses[MAX_NB_SHELL_BLOCKS])41 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 icdf[ 1 ] = 0;
56 q_ptr = pulses;
57 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
58 icdf_ptr = &silk_sign_iCDF[ i ];
59 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
60 for( i = 0; i < length; i++ ) {
61 p = sum_pulses[ i ];
62 if( p > 0 ) {
63 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
64 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
65 if( q_ptr[ j ] != 0 ) {
66 ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 );
67 }
68 }
69 }
70 q_ptr += SHELL_CODEC_FRAME_LENGTH;
71 }
72 }
73
74 /* Decodes signs of excitation */
silk_decode_signs(ec_dec * psRangeDec,opus_int16 pulses[],opus_int length,const opus_int signalType,const opus_int quantOffsetType,const opus_int sum_pulses[MAX_NB_SHELL_BLOCKS])75 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 icdf[ 1 ] = 0;
90 q_ptr = pulses;
91 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
92 icdf_ptr = &silk_sign_iCDF[ i ];
93 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
94 for( i = 0; i < length; i++ ) {
95 p = sum_pulses[ i ];
96 if( p > 0 ) {
97 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
98 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
99 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 q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) );
109 #endif
110 }
111 }
112 }
113 q_ptr += SHELL_CODEC_FRAME_LENGTH;
114 }
115 }
116