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/**
* @file mpa/decode.c mpa Decode
*
* Copyright (C) 2016 Symonics GmbH
*/
#include <re.h>
#include <baresip.h>
#include <mpg123.h>
#include <speex/speex_resampler.h>
#include <string.h>
#include "mpa.h"
struct audec_state {
mpg123_handle *dec;
SpeexResamplerState *resampler;
};
static void destructor(void *arg)
{
struct audec_state *ads = arg;
mpg123_close(ads->dec);
mpg123_delete(ads->dec);
warning("mpa: decoder destroyed\n");
}
int mpa_decode_update(struct audec_state **adsp, const struct aucodec *ac,
const char *fmtp)
{
struct audec_state *ads;
int mpaerr, err=0;
if (!adsp || !ac || !ac->ch)
return EINVAL;
ads = *adsp;
warning("mpa: decoder created %s\n",fmtp);
if (ads)
mem_deref(ads);
ads = mem_zalloc(sizeof(*ads), destructor);
if (!ads)
return ENOMEM;
ads->dec = mpg123_new(NULL,&mpaerr);
if (!ads->dec) {
warning("mpa: decoder create: %s\n", mpg123_plain_strerror(mpaerr));
err = ENOMEM;
goto out;
}
mpaerr = mpg123_param(ads->dec, MPG123_VERBOSE, 4, 4.);
if(mpaerr != MPG123_OK) {
error("MPA libmpg123 param error %s", mpg123_plain_strerror(mpaerr));
err = EINVAL;
goto out;
}
mpaerr = mpg123_format_all(ads->dec);
if(mpaerr != MPG123_OK) {
error("MPA libmpg123 format error %s", mpg123_plain_strerror(mpaerr));
err = EINVAL;
goto out;
}
mpaerr = mpg123_open_feed(ads->dec);
if(mpaerr != MPG123_OK) {
error("MPA libmpg123 open feed error %s", mpg123_plain_strerror(mpaerr));
err = EINVAL;
goto out;
}
out:
if (err)
mem_deref(ads);
else
*adsp = ads;
return err;
}
int mpa_decode_frm(struct audec_state *ads, int16_t *sampv, size_t *sampc,
const uint8_t *buf, size_t len)
{
int mpaerr, channels, encoding;
long samplerate,res;
size_t n;
uint32_t header;
static int16_t ds[2304];
spx_uint32_t ds_len;
spx_uint32_t in_len;
if (!ads || !sampv || !sampc || !buf)
return EINVAL;
if(len<=4)
return EINVAL;
header = *(uint32_t*)buf;
if(header != 0) {
error("MPA header is not zero %08X\n", header);
return EPROTO;
}
if(ads->resampler) {
in_len = *sampc;
ds_len = 2304*2;
mpaerr = mpg123_decode(ads->dec, buf+4, len-4, (unsigned char*)ds, sizeof(ds), &n); /* n counts bytes */
ds_len = n / 4; /* ds_len counts samples per channel */
res=speex_resampler_process_interleaved_int(ads->resampler, ds, &ds_len, sampv, &in_len);
if (res!=RESAMPLER_ERR_SUCCESS) {
warning("mpa: upsample error: %s %d %d\n", strerror(res), in_len, *sampc/2);
return EPROTO;
}
warning("mpa decode %d %d %d %d\n",ds_len,*sampc,in_len,n);
*sampc = in_len * 2;
}
else {
mpaerr = mpg123_decode(ads->dec, buf+4, len-4, (unsigned char*)sampv, *sampc*2, &n);
warning("mpa decode %d %d\n",*sampc,n);
*sampc = n / 2;
}
if(mpaerr == MPG123_NEW_FORMAT) {
mpg123_getformat(ads->dec, &samplerate, &channels, &encoding);
info("MPA libmpg123 format change %d %d %04X\n",samplerate,channels,encoding);
if(channels == 1) {
warning("mpa: resampler channel 1\n");
ads->resampler = NULL;
return EINVAL;
}
if(samplerate != 48000) {
ads->resampler = speex_resampler_init(2, samplerate, 48000, 3, &mpaerr);
if(mpaerr!=RESAMPLER_ERR_SUCCESS || ads->resampler==NULL) {
warning("mpa: upsampler init failed %d\n",mpaerr);
return EINVAL;
}
}
else
ads->resampler = NULL;
}
else if(mpaerr == MPG123_NEED_MORE)
return 0;
else if(mpaerr != MPG123_OK) {
error("MPA libmpg123 feed error %d %s", mpaerr, mpg123_plain_strerror(mpaerr));
return EPROTO;
}
// warning("mpa decode %d %d %d\n",*sampc,len,n);
return 0;
}
int mpa_decode_pkloss(struct audec_state *ads, int16_t *sampv, size_t *sampc)
{
if (!ads || !sampv || !sampc)
return EINVAL;
warning("mpa packet loss %d\n",*sampc);
// n = opus_decode(ads->dec, NULL, 0, sampv, (int)(*sampc/ads->ch), 0);
// if (n < 0)
// return EPROTO;
// *sampc = n * ads->ch;
return 0;
}
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