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/**
* @file opus/decode.c Opus Decode
*
* Copyright (C) 2010 Alfred E. Heggestad
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <opus/opus.h>
#include "opus.h"
struct audec_state {
OpusDecoder *dec;
unsigned ch;
};
static void destructor(void *arg)
{
struct audec_state *ads = arg;
if (ads->dec)
opus_decoder_destroy(ads->dec);
}
int opus_decode_update(struct audec_state **adsp, const struct aucodec *ac,
const char *fmtp)
{
struct audec_state *ads;
int opuserr, err = 0;
(void)fmtp;
if (!adsp || !ac || !ac->ch)
return EINVAL;
ads = *adsp;
if (ads)
return 0;
ads = mem_zalloc(sizeof(*ads), destructor);
if (!ads)
return ENOMEM;
ads->ch = ac->ch;
ads->dec = opus_decoder_create(ac->srate, ac->ch, &opuserr);
if (!ads->dec) {
warning("opus: decoder create: %s\n", opus_strerror(opuserr));
err = ENOMEM;
goto out;
}
out:
if (err)
mem_deref(ads);
else
*adsp = ads;
return err;
}
int opus_decode_frm(struct audec_state *ads,
int fmt, void *sampv, size_t *sampc,
bool marker, const uint8_t *buf, size_t len)
{
int n;
(void)marker;
if (!ads || !sampv || !sampc || !buf)
return EINVAL;
switch (fmt) {
case AUFMT_S16LE:
n = opus_decode(ads->dec, buf, (opus_int32)len,
sampv, (int)(*sampc/ads->ch), 0);
if (n < 0) {
warning("opus: decode error: %s\n", opus_strerror(n));
return EPROTO;
}
break;
case AUFMT_FLOAT:
n = opus_decode_float(ads->dec, buf, (opus_int32)len,
sampv, (int)(*sampc/ads->ch), 0);
if (n < 0) {
warning("opus: float decode error: %s\n",
opus_strerror(n));
return EPROTO;
}
break;
default:
return ENOTSUP;
}
*sampc = n * ads->ch;
return 0;
}
int opus_decode_pkloss(struct audec_state *ads,
int fmt, void *sampv, size_t *sampc,
const uint8_t *buf, size_t len)
{
int n;
opus_int32 frame_size;
size_t nsamp = 0;
bool fec;
if (!ads || !sampv || !sampc)
return EINVAL;
/*
* FEC=0 -> use PLC
* FEC=1 -> use inband FEC
*/
fec = opus_packet_loss > 0;
opus_decoder_ctl(ads->dec, OPUS_GET_LAST_PACKET_DURATION(&frame_size));
switch (fmt) {
case AUFMT_S16LE:
n = opus_decode(ads->dec,
fec ? buf : NULL,
fec ? (opus_int32)len : 0,
sampv, (int)(frame_size), fec);
if (n < 0) {
warning("opus: decode error: %s\n", opus_strerror(n));
return EPROTO;
}
break;
case AUFMT_FLOAT:
n = opus_decode_float(ads->dec,
fec ? buf : NULL,
fec ? (opus_int32)len : 0,
sampv, (int)(frame_size), fec);
if (n < 0) {
warning("opus: decode error: %s\n", opus_strerror(n));
return EPROTO;
}
break;
default:
return ENOTSUP;
}
nsamp = (n * ads->ch);
if (nsamp > *sampc) {
warning("opus: pkloss: buffer too small.\n");
return ENOMEM;
}
*sampc = nsamp;
return 0;
}
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