blob: 73a90ed6673982ff3474ecf6cc45e2d48e8b5365 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
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
|
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
iLBC_define.h
Copyright (C) The Internet Society (2004).
All Rights Reserved.
******************************************************************/
#include <string.h>
#ifndef __iLBC_ILBCDEFINE_H
#define __iLBC_ILBCDEFINE_H
/* general codec settings */
#define FS (float)8000.0
#define BLOCKL_20MS 160
#define BLOCKL_30MS 240
#define BLOCKL_MAX 240
#define NSUB_20MS 4
#define NSUB_30MS 6
#define NSUB_MAX 6
#define NASUB_20MS 2
#define NASUB_30MS 4
#define NASUB_MAX 4
#define SUBL 40
#define STATE_LEN 80
#define STATE_SHORT_LEN_30MS 58
#define STATE_SHORT_LEN_20MS 57
/* LPC settings */
#define LPC_FILTERORDER 10
#define LPC_CHIRP_SYNTDENUM (float)0.9025
#define LPC_CHIRP_WEIGHTDENUM (float)0.4222
#define LPC_LOOKBACK 60
#define LPC_N_20MS 1
#define LPC_N_30MS 2
#define LPC_N_MAX 2
#define LPC_ASYMDIFF 20
#define LPC_BW (float)60.0
#define LPC_WN (float)1.0001
#define LSF_NSPLIT 3
#define LSF_NUMBER_OF_STEPS 4
#define LPC_HALFORDER (LPC_FILTERORDER/2)
/* cb settings */
#define CB_NSTAGES 3
#define CB_EXPAND 2
#define CB_MEML 147
#define CB_FILTERLEN 2*4
#define CB_HALFFILTERLEN 4
#define CB_RESRANGE 34
#define CB_MAXGAIN (float)1.3
/* enhancer */
#define ENH_BLOCKL 80 /* block length */
#define ENH_BLOCKL_HALF (ENH_BLOCKL/2)
#define ENH_HL 3 /* 2*ENH_HL+1 is number blocks
in said second sequence */
#define ENH_SLOP 2 /* max difference estimated and
correct pitch period */
#define ENH_PLOCSL 20 /* pitch-estimates and pitch-
locations buffer length */
#define ENH_OVERHANG 2
#define ENH_UPS0 4 /* upsampling rate */
#define ENH_FL0 3 /* 2*FLO+1 is the length of
each filter */
#define ENH_VECTL (ENH_BLOCKL+2*ENH_FL0)
#define ENH_CORRDIM (2*ENH_SLOP+1)
#define ENH_NBLOCKS (BLOCKL_MAX/ENH_BLOCKL)
#define ENH_NBLOCKS_EXTRA 5
#define ENH_NBLOCKS_TOT 8 /* ENH_NBLOCKS +
ENH_NBLOCKS_EXTRA */
#define ENH_BUFL (ENH_NBLOCKS_TOT)*ENH_BLOCKL
#define ENH_ALPHA0 (float)0.05
/* Down sampling */
#define FILTERORDER_DS 7
#define DELAY_DS 3
#define FACTOR_DS 2
/* bit stream defs */
#define NO_OF_BYTES_20MS 38
#define NO_OF_BYTES_30MS 50
#define NO_OF_WORDS_20MS 19
#define NO_OF_WORDS_30MS 25
#define STATE_BITS 3
#define BYTE_LEN 8
#define ULP_CLASSES 3
/* help parameters */
#define FLOAT_MAX (float)1.0e37
#define EPS (float)2.220446049250313e-016
#define PI (float)3.14159265358979323846
#define MIN_SAMPLE -32768
#define MAX_SAMPLE 32767
#define TWO_PI (float)6.283185307
#define PI2 (float)0.159154943
/* type definition encoder instance */
typedef struct iLBC_ULP_Inst_t_ {
int lsf_bits[6][ULP_CLASSES+2];
int start_bits[ULP_CLASSES+2];
int startfirst_bits[ULP_CLASSES+2];
int scale_bits[ULP_CLASSES+2];
int state_bits[ULP_CLASSES+2];
int extra_cb_index[CB_NSTAGES][ULP_CLASSES+2];
int extra_cb_gain[CB_NSTAGES][ULP_CLASSES+2];
int cb_index[NSUB_MAX][CB_NSTAGES][ULP_CLASSES+2];
int cb_gain[NSUB_MAX][CB_NSTAGES][ULP_CLASSES+2];
} iLBC_ULP_Inst_t;
/* type definition encoder instance */
typedef struct iLBC_Enc_Inst_t_ {
/* flag for frame size mode */
int mode;
/* basic parameters for different frame sizes */
int blockl;
int nsub;
int nasub;
int no_of_bytes, no_of_words;
int lpc_n;
int state_short_len;
const iLBC_ULP_Inst_t *ULP_inst;
/* analysis filter state */
float anaMem[LPC_FILTERORDER];
/* old lsf parameters for interpolation */
float lsfold[LPC_FILTERORDER];
float lsfdeqold[LPC_FILTERORDER];
/* signal buffer for LP analysis */
float lpc_buffer[LPC_LOOKBACK + BLOCKL_MAX];
/* state of input HP filter */
float hpimem[4];
} iLBC_Enc_Inst_t;
/* type definition decoder instance */
typedef struct iLBC_Dec_Inst_t_ {
/* flag for frame size mode */
int mode;
/* basic parameters for different frame sizes */
int blockl;
int nsub;
int nasub;
int no_of_bytes, no_of_words;
int lpc_n;
int state_short_len;
const iLBC_ULP_Inst_t *ULP_inst;
/* synthesis filter state */
float syntMem[LPC_FILTERORDER];
/* old LSF for interpolation */
float lsfdeqold[LPC_FILTERORDER];
/* pitch lag estimated in enhancer and used in PLC */
int last_lag;
/* PLC state information */
int prevLag, consPLICount, prevPLI, prev_enh_pl;
float prevLpc[LPC_FILTERORDER+1];
float prevResidual[NSUB_MAX*SUBL];
float per;
unsigned long seed;
/* previous synthesis filter parameters */
float old_syntdenum[(LPC_FILTERORDER + 1)*NSUB_MAX];
/* state of output HP filter */
float hpomem[4];
/* enhancer state information */
int use_enhancer;
float enh_buf[ENH_BUFL];
float enh_period[ENH_NBLOCKS_TOT];
} iLBC_Dec_Inst_t;
#endif
|
