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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/**
* @file codec2.c CODEC2 audio codec
*
* Copyright (C) 2015 Alfred E. Heggestad
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <codec2/codec2.h>
/**
* @defgroup codec2 codec2
*
* The CODEC2 low-bitrate speech audio codec
*
* https://en.wikipedia.org/wiki/Codec2
*/
struct auenc_state {
struct CODEC2 *c2;
};
struct audec_state {
struct CODEC2 *c2;
};
static uint32_t codec2_mode = CODEC2_MODE_2400;
static void encode_destructor(void *data)
{
struct auenc_state *st = data;
if (st->c2)
codec2_destroy(st->c2);
}
static int encode_update(struct auenc_state **aesp,
const struct aucodec *ac,
struct auenc_param *prm, const char *fmtp)
{
struct auenc_state *st;
int err = 0;
(void)prm;
(void)fmtp;
if (!aesp || !ac)
return EINVAL;
if (*aesp)
return 0;
st = mem_zalloc(sizeof(*st), encode_destructor);
if (!st)
return ENOMEM;
st->c2 = codec2_create(codec2_mode);
if (!st->c2) {
err = ENOMEM;
goto out;
}
info("codec2: %d samples per frame, %d bits per frame\n",
codec2_samples_per_frame(st->c2),
codec2_bits_per_frame(st->c2));
out:
if (err)
mem_deref(st);
else
*aesp = st;
return err;
}
static void decode_destructor(void *data)
{
struct audec_state *st = data;
if (st->c2)
codec2_destroy(st->c2);
}
static int decode_update(struct audec_state **adsp,
const struct aucodec *ac, const char *fmtp)
{
struct audec_state *st;
int err = 0;
(void)fmtp;
if (!adsp || !ac)
return EINVAL;
if (*adsp)
return 0;
st = mem_zalloc(sizeof(*st), decode_destructor);
if (!st)
return ENOMEM;
st->c2 = codec2_create(codec2_mode);
if (!st->c2) {
err = ENOMEM;
goto out;
}
out:
if (err)
mem_deref(st);
else
*adsp = st;
return err;
}
static int encode(struct auenc_state *aes, bool *marker, uint8_t *buf,
size_t *len, int fmt, const void *sampv, size_t sampc)
{
size_t bytes_per_frame;
(void)marker;
if (!buf || !len || !sampv)
return EINVAL;
bytes_per_frame = (codec2_bits_per_frame(aes->c2) + 7) / 8;
if (*len < bytes_per_frame)
return ENOMEM;
if (sampc != (size_t)codec2_samples_per_frame(aes->c2))
return EPROTO;
if (fmt != AUFMT_S16LE)
return ENOTSUP;
codec2_encode(aes->c2, buf, (short *)sampv);
*len = bytes_per_frame;
return 0;
}
static int decode(struct audec_state *ads, int fmt, void *sampv,
size_t *sampc, bool marker, const uint8_t *buf, size_t len)
{
size_t bytes_per_frame;
(void)marker;
if (!sampv || !sampc || !buf)
return EINVAL;
bytes_per_frame = (codec2_bits_per_frame(ads->c2) + 7) / 8;
if (*sampc < (size_t)codec2_samples_per_frame(ads->c2))
return ENOMEM;
if (len < bytes_per_frame)
return EPROTO;
if (fmt != AUFMT_S16LE)
return ENOTSUP;
codec2_decode(ads->c2, sampv, buf);
*sampc = codec2_samples_per_frame(ads->c2);
return 0;
}
static struct aucodec codec2 = {
.name = "CODEC2",
.srate = 8000,
.crate = 8000,
.ch = 1,
.pch = 1,
.encupdh = encode_update,
.ench = encode,
.decupdh = decode_update,
.dech = decode,
};
static int module_init(void)
{
conf_get_u32(conf_cur(), "codec2_mode", &codec2_mode);
info("codec2: using mode %d\n", codec2_mode);
aucodec_register(baresip_aucodecl(), &codec2);
return 0;
}
static int module_close(void)
{
aucodec_unregister(&codec2);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(codec2) = {
"codec2",
"audio codec",
module_init,
module_close,
};
|
