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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;
int channels;
int16_t intermediate_buffer[MPA_FRAMESIZE*2];
int start;
};
static void destructor(void *arg)
{
struct audec_state *ads = arg;
if (ads->resampler)
speex_resampler_destroy(ads->resampler);
mpg123_close(ads->dec);
mpg123_delete(ads->dec);
#ifdef DEBUG
debug("MPA dec destroyed\n");
#endif
}
int mpa_decode_update(struct audec_state **adsp, const struct aucodec *ac,
const char *fmtp)
{
struct audec_state *ads;
int result, err=0;
(void)fmtp;
if (!adsp || !ac || !ac->ch)
return EINVAL;
ads = *adsp;
#ifdef DEBUG
debug("MPA dec created %s\n",fmtp);
#endif
if (!ads) {
ads = mem_zalloc(sizeof(*ads), destructor);
if (!ads)
return ENOMEM;
}
else {
memset(ads,0,sizeof(*ads));
}
ads->channels = 0;
ads->resampler = NULL;
ads->start = 0;
ads->dec = mpg123_new(NULL,&result);
if (!ads->dec) {
error("MPA dec create: %s\n",
mpg123_plain_strerror(result));
err = ENOMEM;
goto out;
}
#ifdef DEBUG
result = mpg123_param(ads->dec, MPG123_VERBOSE, 4, 4.);
#else
result = mpg123_param(ads->dec, MPG123_VERBOSE, 0, 0.);
#endif
if (result != MPG123_OK) {
error("MPA dec param error %s\n",
mpg123_plain_strerror(result));
err = EINVAL;
goto out;
}
result = mpg123_format_all(ads->dec);
if (result != MPG123_OK) {
error("MPA dec format error %s\n",
mpg123_plain_strerror(result));
err = EINVAL;
goto out;
}
result = mpg123_open_feed(ads->dec);
if (result != MPG123_OK) {
error("MPA dec open feed error %s\n",
mpg123_plain_strerror(result));
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 result, channels, encoding, i;
long samplerate;
size_t n;
spx_uint32_t intermediate_len;
spx_uint32_t out_len;
#ifdef DEBUG
debug("MPA dec start %d %ld\n",len, *sampc);
#endif
if (!ads || !sampv || !sampc || !buf || len<=4)
return EINVAL;
if (*(uint32_t*)(void *)buf != 0) {
error("MPA dec header is not zero %08X, not supported yet\n",
*(uint32_t*)(void *)buf);
return EPROTO;
}
n = 0;
result = mpg123_decode(ads->dec, buf+4, len-4,
(unsigned char*)ads->intermediate_buffer,
sizeof(ads->intermediate_buffer), &n);
/* n counts bytes */
#ifdef DEBUG
debug("MPA dec %d %d %d %d\n",result, len-4, n, ads->channels);
#endif
if (result == MPG123_NEW_FORMAT) {
mpg123_getformat(ads->dec, &samplerate, &channels, &encoding);
info("MPA dec format change %d %d %04X\n",samplerate
,channels,encoding);
ads->channels = channels;
ads->start = 0;
if (ads->resampler)
speex_resampler_destroy(ads->resampler);
if (samplerate != MPA_IORATE) {
ads->resampler = speex_resampler_init(channels,
(uint32_t)samplerate, MPA_IORATE,
3, &result);
if (result!=RESAMPLER_ERR_SUCCESS
|| ads->resampler==NULL) {
error("MPA dec upsampler failed %d\n",result);
return EINVAL;
}
}
else
ads->resampler = NULL;
}
else if (result == MPG123_NEED_MORE)
; /* workaround: do nothing */
else if (result != MPG123_OK) {
error("MPA dec feed error %d %s\n", result,
mpg123_plain_strerror(result));
return EPROTO;
}
if (ads->resampler) {
intermediate_len = (uint32_t)(n / 2 / ads->channels);
/* intermediate_len counts samples per channel */
out_len = (uint32_t)(*sampc / 2);
result=speex_resampler_process_interleaved_int(
ads->resampler, ads->intermediate_buffer,
&intermediate_len, sampv, &out_len);
if (result!=RESAMPLER_ERR_SUCCESS) {
error("MPA dec upsample error: %s %d %d\n",
strerror(result), out_len, *sampc/2);
return EPROTO;
}
if (ads->channels==1) {
for (i=out_len-1;i>=0;i--)
sampv[i+i+1]=sampv[i+i]=sampv[i];
*sampc = out_len * 2;
}
else
*sampc = out_len * ads->channels;
}
else {
n /= 2;
if (ads->channels!=1) {
for (i=0;(unsigned)i<n;i++)
sampv[i]=ads->intermediate_buffer[i];
*sampc = n;
}
else {
for (i=0;(unsigned)i<n;i++)
sampv[i*2]=sampv[i*2+1]=
ads->intermediate_buffer[i];
*sampc = n * 2;
}
#ifdef DEBUG
debug("MPA dec done %d\n",*sampc);
#endif
}
return 0;
}
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