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/**
* @file opus_multistream/decode.c Opus Multistream Decode
*
* Copyright (C) 2019 Alfred E. Heggestad
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <opus/opus_multistream.h>
#include "opus_multistream.h"
struct audec_state {
OpusMSDecoder *dec;
unsigned ch;
};
static void destructor(void *arg)
{
struct audec_state *ads = arg;
if (ads->dec)
opus_multistream_decoder_destroy(ads->dec);
}
int opus_multistream_decode_update(struct audec_state **adsp,
const struct aucodec *ac, const char *fmtp)
{
struct audec_state *ads;
unsigned ch;
unsigned char mapping[256];
int opuserr, err = 0;
(void)fmtp;
if (!adsp || !ac || !ac->ch)
return EINVAL;
ads = *adsp;
if (ads)
return 0;
/* create one mapping per channel */
for (ch=0; ch<ac->ch; ch++) {
if (ch >= 256) {
warning("opus: Exceeding the acceptable"
" 255 channel-mappings\n");
return EINVAL;
}
else {
mapping[ch] = ch;
}
}
ads = mem_zalloc(sizeof(*ads), destructor);
if (!ads)
return ENOMEM;
ads->ch = ac->ch;
ads->dec = opus_multistream_decoder_create(ac->srate, ac->ch,
opus_ms_streams,
opus_ms_c_streams,
mapping, &opuserr);
if (!ads->dec) {
warning("opus_multistream: decoder create: %s\n",
opus_strerror(opuserr));
err = ENOMEM;
goto out;
}
out:
if (err)
mem_deref(ads);
else
*adsp = ads;
return err;
}
int opus_multistream_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_multistream_decode(ads->dec, buf, (opus_int32)len,
sampv, (int)(*sampc/ads->ch), 0);
if (n < 0) {
warning("opus_multistream: decode error: %s\n",
opus_strerror(n));
return EPROTO;
}
break;
case AUFMT_FLOAT:
n = opus_multistream_decode_float(ads->dec,
buf, (opus_int32)len,
sampv, (int)(*sampc/ads->ch), 0);
if (n < 0) {
warning("opus_multistream: float decode error: %s\n",
opus_strerror(n));
return EPROTO;
}
break;
default:
return ENOTSUP;
}
*sampc = n * ads->ch;
return 0;
}
int opus_multistream_decode_pkloss(struct audec_state *ads,
int fmt, void *sampv, size_t *sampc,
const uint8_t *buf, size_t len)
{
int n;
(void)buf;
(void)len;
if (!ads || !sampv || !sampc)
return EINVAL;
switch (fmt) {
case AUFMT_S16LE:
n = opus_multistream_decode(ads->dec, NULL, 0,
sampv, (int)(*sampc/ads->ch), 0);
if (n < 0)
return EPROTO;
break;
case AUFMT_FLOAT:
n = opus_multistream_decode_float(ads->dec, NULL, 0,
sampv, (int)(*sampc/ads->ch), 0);
if (n < 0)
return EPROTO;
break;
default:
return ENOTSUP;
}
*sampc = n * ads->ch;
return 0;
}
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