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/**
* @file mpa/encode.c mpa Encode
*
* Copyright (C) 2016 Symonics GmbH
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <twolame.h>
#include <string.h>
#include <speex/speex_resampler.h>
#include "mpa.h"
struct auenc_state {
twolame_options *enc;
int channels, samplerate;
SpeexResamplerState *resampler;
int16_t intermediate_buffer[MPA_FRAMESIZE*6];
uint32_t timestamp;
};
static void destructor(void *arg)
{
struct auenc_state *aes = arg;
if (aes->resampler) {
speex_resampler_destroy(aes->resampler);
aes->resampler = NULL;
}
if (aes->enc)
twolame_close(&aes->enc);
#ifdef DEBUG
debug("MPA enc destroyed\n");
#endif
}
int mpa_encode_update(struct auenc_state **aesp, const struct aucodec *ac,
struct auenc_param *param, const char *fmtp)
{
struct auenc_state *aes;
struct mpa_param prm;
int result,err=0;
(void)param;
if (!aesp || !ac || !ac->ch)
return EINVAL;
aes = *aesp;
if (!aes) {
aes = mem_zalloc(sizeof(*aes), destructor);
if (!aes)
return ENOMEM;
}
else
memset(aes,0,sizeof(*aes));
aes->enc = twolame_init();
if (!aes->enc) {
warning("MPA enc create failed\n");
mem_deref(aes);
return ENOMEM;
}
#ifdef DEBUG
debug("MPA enc created %s\n",fmtp);
#endif
aes->channels = ac->ch;
aes->timestamp = rand_u32();
prm.samplerate = 48000;
prm.bitrate = 128000;
prm.layer = 2;
prm.mode = SINGLE_CHANNEL;
mpa_decode_fmtp(&prm, fmtp);
aes->samplerate = prm.samplerate;
result = 0;
#ifdef DEBUG
result |= twolame_set_verbosity(aes->enc, 5);
#else
result |= twolame_set_verbosity(aes->enc, 0);
#endif
result |= twolame_set_mode(aes->enc,
prm.mode == SINGLE_CHANNEL ? TWOLAME_MONO :
prm.mode == DUAL_CHANNEL ? TWOLAME_DUAL_CHANNEL :
prm.mode == JOINT_STEREO ? TWOLAME_JOINT_STEREO :
prm.mode == STEREO ? TWOLAME_STEREO : TWOLAME_AUTO_MODE);
result |= twolame_set_version(aes->enc,
prm.samplerate < 32000 ? TWOLAME_MPEG2 : TWOLAME_MPEG1);
result |= twolame_set_bitrate(aes->enc, prm.bitrate/1000);
result |= twolame_set_in_samplerate(aes->enc, prm.samplerate);
result |= twolame_set_out_samplerate(aes->enc, prm.samplerate);
result |= twolame_set_num_channels(aes->enc, 2);
if (result!=0) {
warning("MPA enc set failed\n");
err=EINVAL;
goto out;
}
result = twolame_init_params(aes->enc);
if (result!=0) {
warning("MPA enc init params failed\n");
err=EINVAL;
goto out;
}
#ifdef DEBUG
twolame_print_config(aes->enc);
#endif
if (prm.samplerate != MPA_IORATE) {
aes->resampler = speex_resampler_init(2, MPA_IORATE,
prm.samplerate, 3, &result);
if (result!=RESAMPLER_ERR_SUCCESS) {
warning("MPA enc resampler init failed %d\n",result);
err=EINVAL;
goto out;
}
}
else
aes->resampler = NULL;
out:
if (err)
mem_deref(aes);
else
*aesp = aes;
return err;
}
int mpa_encode_frm(struct auenc_state *aes, uint8_t *buf, size_t *len,
int fmt, const void *sampv, size_t sampc)
{
int n;
spx_uint32_t intermediate_len,in_len;
if (!aes || !buf || !len || !sampv)
return EINVAL;
if (fmt != AUFMT_S16LE)
return ENOTSUP;
if (aes->resampler) {
in_len = (uint32_t)sampc/2;
intermediate_len = sizeof(aes->intermediate_buffer)
/ sizeof(aes->intermediate_buffer[0]);
n=speex_resampler_process_interleaved_int(aes->resampler,
sampv, &in_len, aes->intermediate_buffer,
&intermediate_len);
if (n!=RESAMPLER_ERR_SUCCESS || in_len != sampc/2) {
warning("MPA enc downsample error: %s %d %d\n",
strerror(n), in_len, sampc/2);
return EPROTO;
}
n = twolame_encode_buffer_interleaved(aes->enc,
aes->intermediate_buffer, intermediate_len,
buf+4, (int)(*len)-4);
#ifdef DEBUG
debug("MPA enc %d %d %d %d %d %p\n",intermediate_len,sampc,
aes->channels,*len,n,aes->enc);
#endif
}
else {
n = twolame_encode_buffer_interleaved(aes->enc,
sampv, (int)(sampc/2),
buf+4, (int)(*len)-4);
#ifdef DEBUG
debug("MPA enc %d %d %d %d\n",sampc,
aes->channels,*len,n);
#endif
}
if (n < 0) {
warning("MPA enc error %s\n", strerror((int)n));
return EPROTO;
}
if (n > 0) {
*(uint32_t*)(void *)buf = 0;
*len = n+4;
}
else
*len = 0;
#ifdef DEBUG
debug("MPA enc done %d %d %d %d %p\n",sampc,aes->channels,
*len,n,aes->enc);
#endif
aes->timestamp += ((MPA_FRAMESIZE*MPA_RTPRATE)<<4) / aes->samplerate;
return 0x00010000 | ((aes->timestamp>>4) & 0x0000ffff);
}
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