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 : /* shell coder; pulse-subframe length is hardcoded */
35 :
36 0 : static OPUS_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 0 : for( k = 0; k < len; k++ ) {
44 0 : out[ k ] = in[ 2 * k ] + in[ 2 * k + 1 ];
45 : }
46 0 : }
47 :
48 0 : static OPUS_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 0 : if( p > 0 ) {
56 0 : ec_enc_icdf( psRangeEnc, p_child1, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
57 : }
58 0 : }
59 :
60 0 : static OPUS_INLINE void decode_split(
61 : opus_int16 *p_child1, /* O pulse amplitude of first child subframe */
62 : opus_int16 *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 0 : if( p > 0 ) {
69 0 : p_child1[ 0 ] = ec_dec_icdf( psRangeDec, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
70 0 : p_child2[ 0 ] = p - p_child1[ 0 ];
71 : } else {
72 0 : p_child1[ 0 ] = 0;
73 0 : p_child2[ 0 ] = 0;
74 : }
75 0 : }
76 :
77 : /* Shell encoder, operates on one shell code frame of 16 pulses */
78 0 : 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 0 : combine_pulses( pulses1, pulses0, 8 );
90 0 : combine_pulses( pulses2, pulses1, 4 );
91 0 : combine_pulses( pulses3, pulses2, 2 );
92 0 : combine_pulses( pulses4, pulses3, 1 );
93 :
94 0 : encode_split( psRangeEnc, pulses3[ 0 ], pulses4[ 0 ], silk_shell_code_table3 );
95 :
96 0 : encode_split( psRangeEnc, pulses2[ 0 ], pulses3[ 0 ], silk_shell_code_table2 );
97 :
98 0 : encode_split( psRangeEnc, pulses1[ 0 ], pulses2[ 0 ], silk_shell_code_table1 );
99 0 : encode_split( psRangeEnc, pulses0[ 0 ], pulses1[ 0 ], silk_shell_code_table0 );
100 0 : encode_split( psRangeEnc, pulses0[ 2 ], pulses1[ 1 ], silk_shell_code_table0 );
101 :
102 0 : encode_split( psRangeEnc, pulses1[ 2 ], pulses2[ 1 ], silk_shell_code_table1 );
103 0 : encode_split( psRangeEnc, pulses0[ 4 ], pulses1[ 2 ], silk_shell_code_table0 );
104 0 : encode_split( psRangeEnc, pulses0[ 6 ], pulses1[ 3 ], silk_shell_code_table0 );
105 :
106 0 : encode_split( psRangeEnc, pulses2[ 2 ], pulses3[ 1 ], silk_shell_code_table2 );
107 :
108 0 : encode_split( psRangeEnc, pulses1[ 4 ], pulses2[ 2 ], silk_shell_code_table1 );
109 0 : encode_split( psRangeEnc, pulses0[ 8 ], pulses1[ 4 ], silk_shell_code_table0 );
110 0 : encode_split( psRangeEnc, pulses0[ 10 ], pulses1[ 5 ], silk_shell_code_table0 );
111 :
112 0 : encode_split( psRangeEnc, pulses1[ 6 ], pulses2[ 3 ], silk_shell_code_table1 );
113 0 : encode_split( psRangeEnc, pulses0[ 12 ], pulses1[ 6 ], silk_shell_code_table0 );
114 0 : encode_split( psRangeEnc, pulses0[ 14 ], pulses1[ 7 ], silk_shell_code_table0 );
115 0 : }
116 :
117 :
118 : /* Shell decoder, operates on one shell code frame of 16 pulses */
119 0 : void silk_shell_decoder(
120 : opus_int16 *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_int16 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 0 : decode_split( &pulses3[ 0 ], &pulses3[ 1 ], psRangeDec, pulses4, silk_shell_code_table3 );
131 :
132 0 : decode_split( &pulses2[ 0 ], &pulses2[ 1 ], psRangeDec, pulses3[ 0 ], silk_shell_code_table2 );
133 :
134 0 : decode_split( &pulses1[ 0 ], &pulses1[ 1 ], psRangeDec, pulses2[ 0 ], silk_shell_code_table1 );
135 0 : decode_split( &pulses0[ 0 ], &pulses0[ 1 ], psRangeDec, pulses1[ 0 ], silk_shell_code_table0 );
136 0 : decode_split( &pulses0[ 2 ], &pulses0[ 3 ], psRangeDec, pulses1[ 1 ], silk_shell_code_table0 );
137 :
138 0 : decode_split( &pulses1[ 2 ], &pulses1[ 3 ], psRangeDec, pulses2[ 1 ], silk_shell_code_table1 );
139 0 : decode_split( &pulses0[ 4 ], &pulses0[ 5 ], psRangeDec, pulses1[ 2 ], silk_shell_code_table0 );
140 0 : decode_split( &pulses0[ 6 ], &pulses0[ 7 ], psRangeDec, pulses1[ 3 ], silk_shell_code_table0 );
141 :
142 0 : decode_split( &pulses2[ 2 ], &pulses2[ 3 ], psRangeDec, pulses3[ 1 ], silk_shell_code_table2 );
143 :
144 0 : decode_split( &pulses1[ 4 ], &pulses1[ 5 ], psRangeDec, pulses2[ 2 ], silk_shell_code_table1 );
145 0 : decode_split( &pulses0[ 8 ], &pulses0[ 9 ], psRangeDec, pulses1[ 4 ], silk_shell_code_table0 );
146 0 : decode_split( &pulses0[ 10 ], &pulses0[ 11 ], psRangeDec, pulses1[ 5 ], silk_shell_code_table0 );
147 :
148 0 : decode_split( &pulses1[ 6 ], &pulses1[ 7 ], psRangeDec, pulses2[ 3 ], silk_shell_code_table1 );
149 0 : decode_split( &pulses0[ 12 ], &pulses0[ 13 ], psRangeDec, pulses1[ 6 ], silk_shell_code_table0 );
150 0 : decode_split( &pulses0[ 14 ], &pulses0[ 15 ], psRangeDec, pulses1[ 7 ], silk_shell_code_table0 );
151 0 : }
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