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
|
/**
* @file opus.c Opus Audio Codec
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <baresip.h>
#include <opus/opus.h>
#include "opus.h"
/**
* @defgroup opus opus
*
* The OPUS audio codec
*
* Supported version: libopus 1.0.0 or later
*
* Configuration options:
*
\verbatim
opus_bitrate 128000 # Average bitrate in [bps]
opus_cbr {yes,no} # Constant Bitrate (inverse of VBR)
opus_inbandfec {yes,no} # Enable inband Forward Error Correction (FEC)
opus_dtx {yes,no} # Enable Discontinuous Transmission (DTX)
\endverbatim
*
* References:
*
* RFC 6716 Definition of the Opus Audio Codec
* RFC 7587 RTP Payload Format for the Opus Speech and Audio Codec
*
* http://opus-codec.org/downloads/
*/
static struct aucodec opus = {
.name = "opus",
.srate = 48000,
.crate = 48000,
.ch = 2,
.fmtp = "stereo=1;sprop-stereo=1",
.encupdh = opus_encode_update,
.ench = opus_encode_frm,
.decupdh = opus_decode_update,
.dech = opus_decode_frm,
.plch = opus_decode_pkloss,
};
static int module_init(void)
{
struct conf *conf = conf_cur();
uint32_t value;
static char fmtp[256] = "stereo=1;sprop-stereo=1";
char *p = fmtp + str_len(fmtp);
bool b;
int n = 0;
if (0 == conf_get_u32(conf, "opus_bitrate", &value)) {
n = re_snprintf(p, sizeof(fmtp) - str_len(p),
";maxaveragebitrate=%d", value);
if (n <= 0)
return ENOMEM;
p += n;
}
if (0 == conf_get_bool(conf, "opus_cbr", &b)) {
n = re_snprintf(p, sizeof(fmtp) - str_len(p),
";cbr=%d", b);
if (n <= 0)
return ENOMEM;
p += n;
}
if (0 == conf_get_bool(conf, "opus_inbandfec", &b)) {
n = re_snprintf(p, sizeof(fmtp) - str_len(p),
";useinbandfec=%d", b);
if (n <= 0)
return ENOMEM;
p += n;
}
if (0 == conf_get_bool(conf, "opus_dtx", &b)) {
n = re_snprintf(p, sizeof(fmtp) - str_len(p),
";usedtx=%d", b);
if (n <= 0)
return ENOMEM;
p += n;
}
opus.fmtp = fmtp;
debug("opus: fmtp=\"%s\"\n", fmtp);
aucodec_register(&opus);
return 0;
}
static int module_close(void)
{
aucodec_unregister(&opus);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(opus) = {
"opus",
"audio codec",
module_init,
module_close,
};
|