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/**
* @file opus/encode.c Opus Encode
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <baresip.h>
#include <opus/opus.h>
#include "opus.h"
struct auenc_state {
OpusEncoder *enc;
unsigned ch;
};
static void destructor(void *arg)
{
struct auenc_state *aes = arg;
if (aes->enc)
opus_encoder_destroy(aes->enc);
}
static opus_int32 srate2bw(opus_int32 srate)
{
if (srate >= 48000)
return OPUS_BANDWIDTH_FULLBAND;
else if (srate >= 24000)
return OPUS_BANDWIDTH_SUPERWIDEBAND;
else if (srate >= 16000)
return OPUS_BANDWIDTH_WIDEBAND;
else if (srate >= 12000)
return OPUS_BANDWIDTH_MEDIUMBAND;
else
return OPUS_BANDWIDTH_NARROWBAND;
}
#if 0
static const char *bwname(opus_int32 bw)
{
switch (bw) {
case OPUS_BANDWIDTH_FULLBAND: return "full";
case OPUS_BANDWIDTH_SUPERWIDEBAND: return "superwide";
case OPUS_BANDWIDTH_WIDEBAND: return "wide";
case OPUS_BANDWIDTH_MEDIUMBAND: return "medium";
case OPUS_BANDWIDTH_NARROWBAND: return "narrow";
default: return "???";
}
}
static const char *chname(opus_int32 ch)
{
switch (ch) {
case OPUS_AUTO: return "auto";
case 1: return "mono";
case 2: return "stereo";
default: return "???";
}
}
#endif
int opus_encode_update(struct auenc_state **aesp, const struct aucodec *ac,
struct auenc_param *param, const char *fmtp)
{
struct auenc_state *aes;
struct opus_param prm, conf_prm;
opus_int32 fch, vbr;
const struct aucodec *auc = ac;
(void)param;
if (!aesp || !ac || !ac->ch)
return EINVAL;
debug("opus: encoder fmtp (%s)\n", fmtp);
/* Save the incoming OPUS parameters from SDP offer */
if (str_isset(fmtp)) {
opus_mirror_params(fmtp);
}
aes = *aesp;
if (!aes) {
const opus_int32 complex = 10;
int opuserr;
aes = mem_zalloc(sizeof(*aes), destructor);
if (!aes)
return ENOMEM;
aes->ch = ac->ch;
aes->enc = opus_encoder_create(ac->srate, ac->ch,
/* this has big impact on cpu */
OPUS_APPLICATION_AUDIO,
&opuserr);
if (!aes->enc) {
warning("opus: encoder create: %s\n",
opus_strerror(opuserr));
mem_deref(aes);
return ENOMEM;
}
(void)opus_encoder_ctl(aes->enc, OPUS_SET_COMPLEXITY(complex));
*aesp = aes;
}
prm.srate = 48000;
prm.bitrate = OPUS_AUTO;
prm.stereo = 1;
prm.cbr = 0;
prm.inband_fec = 0;
prm.dtx = 0;
opus_decode_fmtp(&prm, fmtp);
conf_prm.bitrate = OPUS_AUTO;
opus_decode_fmtp(&conf_prm, auc->fmtp);
if ((prm.bitrate == OPUS_AUTO) ||
((conf_prm.bitrate != OPUS_AUTO) &&
(conf_prm.bitrate < prm.bitrate)))
prm.bitrate = conf_prm.bitrate;
fch = prm.stereo ? OPUS_AUTO : 1;
vbr = prm.cbr ? 0 : 1;
(void)opus_encoder_ctl(aes->enc,
OPUS_SET_MAX_BANDWIDTH(srate2bw(prm.srate)));
(void)opus_encoder_ctl(aes->enc, OPUS_SET_BITRATE(prm.bitrate));
(void)opus_encoder_ctl(aes->enc, OPUS_SET_FORCE_CHANNELS(fch));
(void)opus_encoder_ctl(aes->enc, OPUS_SET_VBR(vbr));
(void)opus_encoder_ctl(aes->enc, OPUS_SET_INBAND_FEC(prm.inband_fec));
(void)opus_encoder_ctl(aes->enc, OPUS_SET_DTX(prm.dtx));
#if 0
{
opus_int32 bw, complex;
(void)opus_encoder_ctl(aes->enc, OPUS_GET_MAX_BANDWIDTH(&bw));
(void)opus_encoder_ctl(aes->enc, OPUS_GET_BITRATE(&prm.bitrate));
(void)opus_encoder_ctl(aes->enc, OPUS_GET_FORCE_CHANNELS(&fch));
(void)opus_encoder_ctl(aes->enc, OPUS_GET_VBR(&vbr));
(void)opus_encoder_ctl(aes->enc, OPUS_GET_INBAND_FEC(&prm.inband_fec));
(void)opus_encoder_ctl(aes->enc, OPUS_GET_DTX(&prm.dtx));
(void)opus_encoder_ctl(aes->enc, OPUS_GET_COMPLEXITY(&complex));
debug("opus: encode bw=%s bitrate=%i fch=%s "
"vbr=%i fec=%i dtx=%i complex=%i\n",
bwname(bw), prm.bitrate, chname(fch),
vbr, prm.inband_fec, prm.dtx, complex);
}
#endif
return 0;
}
int opus_encode_frm(struct auenc_state *aes, uint8_t *buf, size_t *len,
const int16_t *sampv, size_t sampc)
{
opus_int32 n;
if (!aes || !buf || !len || !sampv)
return EINVAL;
n = opus_encode(aes->enc, sampv, (int)(sampc/aes->ch),
buf, (opus_int32)(*len));
if (n < 0) {
warning("opus: encode error: %s\n", opus_strerror((int)n));
return EPROTO;
}
*len = n;
return 0;
}
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