encode_pulses.c
1
2
3
4
5
6
7
8
9
10
/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
11
- Neither the name of Internet Society, IETF or IETF Trust, nor the
12
13
14
names of specific contributors, may be used to endorse or promote
products derived from this software without specific prior written
permission.
15
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main.h"
33
#include "stack_alloc.h"
34
35
36
37
38
/*********************************************/
/* Encode quantization indices of excitation */
/*********************************************/
39
static OPUS_INLINE opus_int combine_and_check( /* return ok */
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
opus_int *pulses_comb, /* O */
const opus_int *pulses_in, /* I */
opus_int max_pulses, /* I max value for sum of pulses */
opus_int len /* I number of output values */
)
{
opus_int k, sum;
for( k = 0; k < len; k++ ) {
sum = pulses_in[ 2 * k ] + pulses_in[ 2 * k + 1 ];
if( sum > max_pulses ) {
return 1;
}
pulses_comb[ k ] = sum;
}
return 0;
}
/* Encode quantization indices of excitation */
void silk_encode_pulses(
ec_enc *psRangeEnc, /* I/O compressor data structure */
const opus_int signalType, /* I Signal type */
const opus_int quantOffsetType, /* I quantOffsetType */
opus_int8 pulses[], /* I quantization indices */
const opus_int frame_length /* I Frame length */
)
{
opus_int i, k, j, iter, bit, nLS, scale_down, RateLevelIndex = 0;
opus_int32 abs_q, minSumBits_Q5, sumBits_Q5;
70
71
72
VARDECL( opus_int, abs_pulses );
VARDECL( opus_int, sum_pulses );
VARDECL( opus_int, nRshifts );
73
74
75
76
77
opus_int pulses_comb[ 8 ];
opus_int *abs_pulses_ptr;
const opus_int8 *pulses_ptr;
const opus_uint8 *cdf_ptr;
const opus_uint8 *nBits_ptr;
78
SAVE_STACK;
79
80
81
82
83
84
85
86
87
88
silk_memset( pulses_comb, 0, 8 * sizeof( opus_int ) ); /* Fixing Valgrind reported problem*/
/****************************/
/* Prepare for shell coding */
/****************************/
/* Calculate number of shell blocks */
silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
89
celt_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
90
91
92
93
94
iter++;
silk_memset( &pulses[ frame_length ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof(opus_int8));
}
/* Take the absolute value of the pulses */
95
96
ALLOC( abs_pulses, iter * SHELL_CODEC_FRAME_LENGTH, opus_int );
silk_assert( !( SHELL_CODEC_FRAME_LENGTH & 3 ) );
97
98
99
100
101
102
103
104
for( i = 0; i < iter * SHELL_CODEC_FRAME_LENGTH; i+=4 ) {
abs_pulses[i+0] = ( opus_int )silk_abs( pulses[ i + 0 ] );
abs_pulses[i+1] = ( opus_int )silk_abs( pulses[ i + 1 ] );
abs_pulses[i+2] = ( opus_int )silk_abs( pulses[ i + 2 ] );
abs_pulses[i+3] = ( opus_int )silk_abs( pulses[ i + 3 ] );
}
/* Calc sum pulses per shell code frame */
105
106
ALLOC( sum_pulses, iter, opus_int );
ALLOC( nRshifts, iter, opus_int );
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
abs_pulses_ptr = abs_pulses;
for( i = 0; i < iter; i++ ) {
nRshifts[ i ] = 0;
while( 1 ) {
/* 1+1 -> 2 */
scale_down = combine_and_check( pulses_comb, abs_pulses_ptr, silk_max_pulses_table[ 0 ], 8 );
/* 2+2 -> 4 */
scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 1 ], 4 );
/* 4+4 -> 8 */
scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 2 ], 2 );
/* 8+8 -> 16 */
scale_down += combine_and_check( &sum_pulses[ i ], pulses_comb, silk_max_pulses_table[ 3 ], 1 );
if( scale_down ) {
/* We need to downscale the quantization signal */
nRshifts[ i ]++;
for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
abs_pulses_ptr[ k ] = silk_RSHIFT( abs_pulses_ptr[ k ], 1 );
}
} else {
/* Jump out of while(1) loop and go to next shell coding frame */
break;
}
}
abs_pulses_ptr += SHELL_CODEC_FRAME_LENGTH;
}
/**************/
/* Rate level */
/**************/
/* find rate level that leads to fewest bits for coding of pulses per block info */
minSumBits_Q5 = silk_int32_MAX;
for( k = 0; k < N_RATE_LEVELS - 1; k++ ) {
nBits_ptr = silk_pulses_per_block_BITS_Q5[ k ];
sumBits_Q5 = silk_rate_levels_BITS_Q5[ signalType >> 1 ][ k ];
for( i = 0; i < iter; i++ ) {
if( nRshifts[ i ] > 0 ) {
145
sumBits_Q5 += nBits_ptr[ SILK_MAX_PULSES + 1 ];
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
} else {
sumBits_Q5 += nBits_ptr[ sum_pulses[ i ] ];
}
}
if( sumBits_Q5 < minSumBits_Q5 ) {
minSumBits_Q5 = sumBits_Q5;
RateLevelIndex = k;
}
}
ec_enc_icdf( psRangeEnc, RateLevelIndex, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
/***************************************************/
/* Sum-Weighted-Pulses Encoding */
/***************************************************/
cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
for( i = 0; i < iter; i++ ) {
if( nRshifts[ i ] == 0 ) {
ec_enc_icdf( psRangeEnc, sum_pulses[ i ], cdf_ptr, 8 );
} else {
165
ec_enc_icdf( psRangeEnc, SILK_MAX_PULSES + 1, cdf_ptr, 8 );
166
for( k = 0; k < nRshifts[ i ] - 1; k++ ) {
167
ec_enc_icdf( psRangeEnc, SILK_MAX_PULSES + 1, silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
}
ec_enc_icdf( psRangeEnc, sum_pulses[ i ], silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
}
}
/******************/
/* Shell Encoding */
/******************/
for( i = 0; i < iter; i++ ) {
if( sum_pulses[ i ] > 0 ) {
silk_shell_encoder( psRangeEnc, &abs_pulses[ i * SHELL_CODEC_FRAME_LENGTH ] );
}
}
/****************/
/* LSB Encoding */
/****************/
for( i = 0; i < iter; i++ ) {
if( nRshifts[ i ] > 0 ) {
pulses_ptr = &pulses[ i * SHELL_CODEC_FRAME_LENGTH ];
nLS = nRshifts[ i ] - 1;
for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
abs_q = (opus_int8)silk_abs( pulses_ptr[ k ] );
for( j = nLS; j > 0; j-- ) {
bit = silk_RSHIFT( abs_q, j ) & 1;
ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 );
}
bit = abs_q & 1;
ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 );
}
}
}
/****************/
/* Encode signs */
/****************/
silk_encode_signs( psRangeEnc, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
205
RESTORE_STACK;