diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/shell_coder.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/shell_coder.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/shell_coder.c b/lib/rbcodec/codecs/libopus/silk/shell_coder.c new file mode 100644 index 0000000000..1cc77fd88e --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/shell_coder.c | |||
@@ -0,0 +1,151 @@ | |||
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 | /* shell coder; pulse-subframe length is hardcoded */ | ||
35 | |||
36 | static inline void combine_pulses( | ||
37 | opus_int *out, /* O combined pulses vector [len] */ | ||
38 | const opus_int *in, /* I input vector [2 * len] */ | ||
39 | const opus_int len /* I number of OUTPUT samples */ | ||
40 | ) | ||
41 | { | ||
42 | opus_int k; | ||
43 | for( k = 0; k < len; k++ ) { | ||
44 | out[ k ] = in[ 2 * k ] + in[ 2 * k + 1 ]; | ||
45 | } | ||
46 | } | ||
47 | |||
48 | static inline void encode_split( | ||
49 | ec_enc *psRangeEnc, /* I/O compressor data structure */ | ||
50 | const opus_int p_child1, /* I pulse amplitude of first child subframe */ | ||
51 | const opus_int p, /* I pulse amplitude of current subframe */ | ||
52 | const opus_uint8 *shell_table /* I table of shell cdfs */ | ||
53 | ) | ||
54 | { | ||
55 | if( p > 0 ) { | ||
56 | ec_enc_icdf( psRangeEnc, p_child1, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 ); | ||
57 | } | ||
58 | } | ||
59 | |||
60 | static inline void decode_split( | ||
61 | opus_int *p_child1, /* O pulse amplitude of first child subframe */ | ||
62 | opus_int *p_child2, /* O pulse amplitude of second child subframe */ | ||
63 | ec_dec *psRangeDec, /* I/O Compressor data structure */ | ||
64 | const opus_int p, /* I pulse amplitude of current subframe */ | ||
65 | const opus_uint8 *shell_table /* I table of shell cdfs */ | ||
66 | ) | ||
67 | { | ||
68 | if( p > 0 ) { | ||
69 | p_child1[ 0 ] = ec_dec_icdf( psRangeDec, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 ); | ||
70 | p_child2[ 0 ] = p - p_child1[ 0 ]; | ||
71 | } else { | ||
72 | p_child1[ 0 ] = 0; | ||
73 | p_child2[ 0 ] = 0; | ||
74 | } | ||
75 | } | ||
76 | |||
77 | /* Shell encoder, operates on one shell code frame of 16 pulses */ | ||
78 | void silk_shell_encoder( | ||
79 | ec_enc *psRangeEnc, /* I/O compressor data structure */ | ||
80 | const opus_int *pulses0 /* I data: nonnegative pulse amplitudes */ | ||
81 | ) | ||
82 | { | ||
83 | opus_int pulses1[ 8 ], pulses2[ 4 ], pulses3[ 2 ], pulses4[ 1 ]; | ||
84 | |||
85 | /* this function operates on one shell code frame of 16 pulses */ | ||
86 | silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 ); | ||
87 | |||
88 | /* tree representation per pulse-subframe */ | ||
89 | combine_pulses( pulses1, pulses0, 8 ); | ||
90 | combine_pulses( pulses2, pulses1, 4 ); | ||
91 | combine_pulses( pulses3, pulses2, 2 ); | ||
92 | combine_pulses( pulses4, pulses3, 1 ); | ||
93 | |||
94 | encode_split( psRangeEnc, pulses3[ 0 ], pulses4[ 0 ], silk_shell_code_table3 ); | ||
95 | |||
96 | encode_split( psRangeEnc, pulses2[ 0 ], pulses3[ 0 ], silk_shell_code_table2 ); | ||
97 | |||
98 | encode_split( psRangeEnc, pulses1[ 0 ], pulses2[ 0 ], silk_shell_code_table1 ); | ||
99 | encode_split( psRangeEnc, pulses0[ 0 ], pulses1[ 0 ], silk_shell_code_table0 ); | ||
100 | encode_split( psRangeEnc, pulses0[ 2 ], pulses1[ 1 ], silk_shell_code_table0 ); | ||
101 | |||
102 | encode_split( psRangeEnc, pulses1[ 2 ], pulses2[ 1 ], silk_shell_code_table1 ); | ||
103 | encode_split( psRangeEnc, pulses0[ 4 ], pulses1[ 2 ], silk_shell_code_table0 ); | ||
104 | encode_split( psRangeEnc, pulses0[ 6 ], pulses1[ 3 ], silk_shell_code_table0 ); | ||
105 | |||
106 | encode_split( psRangeEnc, pulses2[ 2 ], pulses3[ 1 ], silk_shell_code_table2 ); | ||
107 | |||
108 | encode_split( psRangeEnc, pulses1[ 4 ], pulses2[ 2 ], silk_shell_code_table1 ); | ||
109 | encode_split( psRangeEnc, pulses0[ 8 ], pulses1[ 4 ], silk_shell_code_table0 ); | ||
110 | encode_split( psRangeEnc, pulses0[ 10 ], pulses1[ 5 ], silk_shell_code_table0 ); | ||
111 | |||
112 | encode_split( psRangeEnc, pulses1[ 6 ], pulses2[ 3 ], silk_shell_code_table1 ); | ||
113 | encode_split( psRangeEnc, pulses0[ 12 ], pulses1[ 6 ], silk_shell_code_table0 ); | ||
114 | encode_split( psRangeEnc, pulses0[ 14 ], pulses1[ 7 ], silk_shell_code_table0 ); | ||
115 | } | ||
116 | |||
117 | |||
118 | /* Shell decoder, operates on one shell code frame of 16 pulses */ | ||
119 | void silk_shell_decoder( | ||
120 | opus_int *pulses0, /* O data: nonnegative pulse amplitudes */ | ||
121 | ec_dec *psRangeDec, /* I/O Compressor data structure */ | ||
122 | const opus_int pulses4 /* I number of pulses per pulse-subframe */ | ||
123 | ) | ||
124 | { | ||
125 | opus_int pulses3[ 2 ], pulses2[ 4 ], pulses1[ 8 ]; | ||
126 | |||
127 | /* this function operates on one shell code frame of 16 pulses */ | ||
128 | silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 ); | ||
129 | |||
130 | decode_split( &pulses3[ 0 ], &pulses3[ 1 ], psRangeDec, pulses4, silk_shell_code_table3 ); | ||
131 | |||
132 | decode_split( &pulses2[ 0 ], &pulses2[ 1 ], psRangeDec, pulses3[ 0 ], silk_shell_code_table2 ); | ||
133 | |||
134 | decode_split( &pulses1[ 0 ], &pulses1[ 1 ], psRangeDec, pulses2[ 0 ], silk_shell_code_table1 ); | ||
135 | decode_split( &pulses0[ 0 ], &pulses0[ 1 ], psRangeDec, pulses1[ 0 ], silk_shell_code_table0 ); | ||
136 | decode_split( &pulses0[ 2 ], &pulses0[ 3 ], psRangeDec, pulses1[ 1 ], silk_shell_code_table0 ); | ||
137 | |||
138 | decode_split( &pulses1[ 2 ], &pulses1[ 3 ], psRangeDec, pulses2[ 1 ], silk_shell_code_table1 ); | ||
139 | decode_split( &pulses0[ 4 ], &pulses0[ 5 ], psRangeDec, pulses1[ 2 ], silk_shell_code_table0 ); | ||
140 | decode_split( &pulses0[ 6 ], &pulses0[ 7 ], psRangeDec, pulses1[ 3 ], silk_shell_code_table0 ); | ||
141 | |||
142 | decode_split( &pulses2[ 2 ], &pulses2[ 3 ], psRangeDec, pulses3[ 1 ], silk_shell_code_table2 ); | ||
143 | |||
144 | decode_split( &pulses1[ 4 ], &pulses1[ 5 ], psRangeDec, pulses2[ 2 ], silk_shell_code_table1 ); | ||
145 | decode_split( &pulses0[ 8 ], &pulses0[ 9 ], psRangeDec, pulses1[ 4 ], silk_shell_code_table0 ); | ||
146 | decode_split( &pulses0[ 10 ], &pulses0[ 11 ], psRangeDec, pulses1[ 5 ], silk_shell_code_table0 ); | ||
147 | |||
148 | decode_split( &pulses1[ 6 ], &pulses1[ 7 ], psRangeDec, pulses2[ 3 ], silk_shell_code_table1 ); | ||
149 | decode_split( &pulses0[ 12 ], &pulses0[ 13 ], psRangeDec, pulses1[ 6 ], silk_shell_code_table0 ); | ||
150 | decode_split( &pulses0[ 14 ], &pulses0[ 15 ], psRangeDec, pulses1[ 7 ], silk_shell_code_table0 ); | ||
151 | } | ||