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/**
* @file opus.c Opus Audio Codec
*
* Copyright (C) 2010 Alfred E. Heggestad
*/
#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_stereo yes # Request peer to send stereo
opus_sprop_stereo yes # Sending stereo
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)
opus_complexity {0-10} # Encoder's computational complexity (10 max)
opus_application {audio, voip} # Encoder's intended application
opus_packet_loss {0-100} # Expected packet loss for FEC
\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 bool opus_mirror;
static char fmtp[256];
static char fmtp_mirror[256];
uint32_t opus_complexity = 10;
opus_int32 opus_application = OPUS_APPLICATION_AUDIO;
opus_int32 opus_packet_loss = 0;
static int opus_fmtp_enc(struct mbuf *mb, const struct sdp_format *fmt,
bool offer, void *arg)
{
bool mirror;
(void)arg;
(void)offer;
if (!mb || !fmt)
return 0;
mirror = !offer && str_isset(fmtp_mirror);
return mbuf_printf(mb, "a=fmtp:%s %s\r\n",
fmt->id, mirror ? fmtp_mirror : fmtp);
}
static struct aucodec opus = {
.name = "opus",
.srate = 48000,
.crate = 48000,
.ch = 2,
.pch = 2,
.fmtp = fmtp,
.encupdh = opus_encode_update,
.ench = opus_encode_frm,
.decupdh = opus_decode_update,
.dech = opus_decode_frm,
.plch = opus_decode_pkloss,
};
void opus_mirror_params(const char *x)
{
if (!opus_mirror)
return;
info("opus: mirror parameters: \"%s\"\n", x);
str_ncpy(fmtp_mirror, x, sizeof(fmtp_mirror));
}
static int module_init(void)
{
struct conf *conf = conf_cur();
uint32_t value;
char *p = fmtp;
bool b, stereo = true, sprop_stereo = true;
struct pl pl;
int n = 0;
fmtp[0] = '\0';
fmtp_mirror[0] = '\0';
conf_get_bool(conf, "opus_stereo", &stereo);
conf_get_bool(conf, "opus_sprop_stereo", &sprop_stereo);
if (!stereo || !sprop_stereo)
opus.ch = 1;
/* always set stereo parameter first */
n = re_snprintf(p, sizeof(fmtp) - str_len(p),
"stereo=%d;sprop-stereo=%d", stereo, sprop_stereo);
if (n <= 0)
return ENOMEM;
p += n;
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_u32(conf, "opus_samplerate", &value)) {
if ((value != 8000) && (value != 12000) && (value != 16000) &&
(value != 24000) && (value != 48000)) {
warning("opus: invalid samplerate: %d\n", value);
return EINVAL;
}
opus.srate = value;
}
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;
}
(void)conf_get_bool(conf, "opus_mirror", &opus_mirror);
if (opus_mirror) {
opus.fmtp = NULL;
opus.fmtp_ench = opus_fmtp_enc;
}
(void)conf_get_u32(conf, "opus_complexity", &opus_complexity);
if (opus_complexity > 10)
opus_complexity = 10;
if (!conf_get(conf, "opus_application", &pl)) {
if (!pl_strcasecmp(&pl, "audio"))
opus_application = OPUS_APPLICATION_AUDIO;
else if (!pl_strcasecmp(&pl, "voip"))
opus_application = OPUS_APPLICATION_VOIP;
else {
warning("opus: unknown encoder application: %r\n",
&pl);
return EINVAL;
}
}
if (0 == conf_get_u32(conf, "opus_packet_loss", &value)) {
if (value > 100)
opus_packet_loss = 100;
else
opus_packet_loss = value;
}
debug("opus: fmtp=\"%s\"\n", fmtp);
aucodec_register(baresip_aucodecl(), &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,
};
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