diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/code_signs.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/code_signs.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/code_signs.c b/lib/rbcodec/codecs/libopus/silk/code_signs.c new file mode 100644 index 0000000000..3903eb1f16 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/code_signs.c | |||
@@ -0,0 +1,115 @@ | |||
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 "opus_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 | 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 */ | ||
75 | void silk_decode_signs( | ||
76 | ec_dec *psRangeDec, /* I/O Compressor data structure */ | ||
77 | opus_int 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_int *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 | } | ||