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/**
* @file mpa/encode.c mpa Encode
*
* Copyright (C) 2016 Symonics GmbH
*/
#include <re.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;
SpeexResamplerState *resampler;
int16_t intermediate_buffer[BARESIP_FRAMESIZE];
};
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) {
mem_deref(aes);
}
aes = mem_zalloc(sizeof(*aes), destructor);
aes->enc = twolame_init();
if (!aes->enc) {
error("MPA enc create failed\n");
mem_deref(aes);
return ENOMEM;
}
aes->channels = ac->ch;
#ifdef DEBUG
debug("MPA enc created %s\n",fmtp);
#endif
prm.samplerate = 32000;
prm.bitrate = 128000;
prm.layer = 2;
prm.mode = SINGLE_CHANNEL;
mpa_decode_fmtp(&prm, fmtp);
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) {
error("MPA enc set failed\n");
err=EINVAL;
goto out;
}
result = twolame_init_params(aes->enc);
if (result!=0) {
error("MPA enc init params failed\n");
err=EINVAL;
goto out;
}
#ifdef DEBUG
twolame_print_config(aes->enc);
#endif
if (prm.samplerate != 48000) {
aes->resampler = speex_resampler_init(2, 48000,
prm.samplerate, 3, &result);
if (result!=RESAMPLER_ERR_SUCCESS) {
error("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,
const int16_t *sampv, size_t sampc)
{
int n;
spx_uint32_t intermediate_len,in_len;
if (!aes || !buf || !len || !sampv)
return EINVAL;
if (aes->resampler) {
in_len = 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) {
error("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, (*len)-4);
#ifdef DEBUG
debug("MPA enc %d %d %d %d %d\n",intermediate_len,sampc,
aes->channels,*len,n);
#endif
}
else
n = twolame_encode_buffer_interleaved(aes->enc, sampv,
(int)(sampc/2), buf+4, (*len)-4);
if (n < 0) {
error("MPA enc error %s\n", strerror((int)n));
return EPROTO;
}
if (n > 0) {
*(uint32_t*)buf = 0;
*len = n+4;
}
else
*len = 0;
#ifdef DEBUG
debug("MPA enc done %d %d %d %d\n",sampc,aes->channels,*len,n);
#endif
return 0;
}
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