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#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include "m_option.h"
#include "mp_msg.h"
#include "aviheader.h"
#include "ms_hdr.h"
#include "muxer.h"
#include "ae_lavc.h"
#include "help_mp.h"
#include "config.h"
#include "libaf/af_format.h"
#ifdef USE_LIBAVCODEC_SO
#include <ffmpeg/avcodec.h>
#else
#include "libavcodec/avcodec.h"
#endif
static AVCodec *lavc_acodec;
static AVCodecContext *lavc_actx;
extern char *lavc_param_acodec;
extern int lavc_param_abitrate;
extern int lavc_param_atag;
extern int lavc_param_audio_global_header;
extern int avcodec_inited;
static int compressed_frame_size = 0;
#if defined(USE_LIBAVFORMAT) || defined(USE_LIBAVFORMAT_SO)
extern unsigned int codec_get_wav_tag(int id);
#endif
static int bind_lavc(audio_encoder_t *encoder, muxer_stream_t *mux_a)
{
mux_a->wf = malloc(sizeof(WAVEFORMATEX)+lavc_actx->extradata_size+256);
mux_a->wf->wFormatTag = lavc_param_atag;
mux_a->wf->nChannels = lavc_actx->channels;
mux_a->wf->nSamplesPerSec = lavc_actx->sample_rate;
mux_a->wf->nAvgBytesPerSec = (lavc_actx->bit_rate / 8);
mux_a->avg_rate= lavc_actx->bit_rate;
mux_a->h.dwRate = mux_a->wf->nAvgBytesPerSec;
if(lavc_actx->block_align)
mux_a->h.dwSampleSize = mux_a->h.dwScale = lavc_actx->block_align;
else
{
mux_a->h.dwScale = (mux_a->wf->nAvgBytesPerSec * lavc_actx->frame_size)/ mux_a->wf->nSamplesPerSec; /* for cbr */
if ((mux_a->wf->nAvgBytesPerSec *
lavc_actx->frame_size) % mux_a->wf->nSamplesPerSec)
{
mux_a->h.dwScale = lavc_actx->frame_size;
mux_a->h.dwRate = lavc_actx->sample_rate;
mux_a->h.dwSampleSize = 0; // Blocksize not constant
}
else
mux_a->h.dwSampleSize = mux_a->h.dwScale;
}
mux_a->wf->nBlockAlign = mux_a->h.dwScale;
mux_a->h.dwSuggestedBufferSize = (encoder->params.audio_preload*mux_a->wf->nAvgBytesPerSec)/1000;
mux_a->h.dwSuggestedBufferSize -= mux_a->h.dwSuggestedBufferSize % mux_a->wf->nBlockAlign;
switch(lavc_param_atag)
{
case 0x11: /* imaadpcm */
mux_a->wf->wBitsPerSample = 4;
mux_a->wf->cbSize = 2;
((uint16_t*)mux_a->wf)[sizeof(WAVEFORMATEX)] =
((lavc_actx->block_align - 4 * lavc_actx->channels) / (4 * lavc_actx->channels)) * 8 + 1;
break;
case 0x55: /* mp3 */
mux_a->wf->cbSize = 12;
mux_a->wf->wBitsPerSample = 0; /* does not apply */
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->wID = 1;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->fdwFlags = 2;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nBlockSize = mux_a->wf->nBlockAlign;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nFramesPerBlock = 1;
((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nCodecDelay = 0;
break;
default:
mux_a->wf->wBitsPerSample = 0; /* Unknown */
if (lavc_actx->extradata && (lavc_actx->extradata_size > 0))
{
memcpy(mux_a->wf+1, lavc_actx->extradata, lavc_actx->extradata_size);
mux_a->wf->cbSize = lavc_actx->extradata_size;
}
else
mux_a->wf->cbSize = 0;
break;
}
// Fix allocation
mux_a->wf = realloc(mux_a->wf, sizeof(WAVEFORMATEX)+mux_a->wf->cbSize);
encoder->input_format = AF_FORMAT_S16_NE;
encoder->min_buffer_size = mux_a->h.dwSuggestedBufferSize;
encoder->max_buffer_size = mux_a->h.dwSuggestedBufferSize*2;
return 1;
}
static int encode_lavc(audio_encoder_t *encoder, uint8_t *dest, void *src, int size, int max_size)
{
int n;
n = avcodec_encode_audio(lavc_actx, dest, size, src);
compressed_frame_size = n;
return n;
}
static int close_lavc(audio_encoder_t *encoder)
{
compressed_frame_size = 0;
return 1;
}
static int get_frame_size(audio_encoder_t *encoder)
{
int sz = compressed_frame_size;
compressed_frame_size = 0;
return sz;
}
static uint32_t lavc_find_atag(char *codec)
{
if(codec == NULL)
return 0;
if(! strcasecmp(codec, "mp2"))
return 0x50;
if(! strcasecmp(codec, "mp3"))
return 0x55;
if(! strcasecmp(codec, "ac3"))
return 0x2000;
if(! strcasecmp(codec, "adpcm_ima_wav"))
return 0x11;
if(! strncasecmp(codec, "bonk", 4))
return 0x2048;
return 0;
}
int mpae_init_lavc(audio_encoder_t *encoder)
{
encoder->params.samples_per_frame = encoder->params.sample_rate;
encoder->params.bitrate = encoder->params.sample_rate * encoder->params.channels * 2 * 8;
if(!lavc_param_acodec)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_NoLavcAudioCodecName);
return 0;
}
if(!avcodec_inited){
avcodec_init();
avcodec_register_all();
avcodec_inited=1;
}
lavc_acodec = avcodec_find_encoder_by_name(lavc_param_acodec);
if (!lavc_acodec)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_LavcAudioCodecNotFound, lavc_param_acodec);
return 0;
}
if(lavc_param_atag == 0)
{
#if defined(USE_LIBAVFORMAT) || defined(USE_LIBAVFORMAT_SO)
lavc_param_atag = codec_get_wav_tag(lavc_acodec->id);
#else
lavc_param_atag = lavc_find_atag(lavc_param_acodec);
#endif
if(!lavc_param_atag)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, "Couldn't find wav tag for specified codec, exit\n");
return 0;
}
}
lavc_actx = avcodec_alloc_context();
if(lavc_actx == NULL)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntAllocateLavcContext);
return 0;
}
// put sample parameters
lavc_actx->channels = encoder->params.channels;
lavc_actx->sample_rate = encoder->params.sample_rate;
lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate * 1000;
/*
* Special case for adpcm_ima_wav.
* The bitrate is only dependant on samplerate.
* We have to known frame_size and block_align in advance,
* so I just copied the code from libavcodec/adpcm.c
*
* However, ms adpcm_ima_wav uses a block_align of 2048,
* lavc defaults to 1024
*/
if(lavc_param_atag == 0x11) {
int blkalign = 2048;
int framesize = (blkalign - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
lavc_actx->bit_rate = lavc_actx->sample_rate*8*blkalign/framesize;
}
if((lavc_param_audio_global_header&1)
/*|| (video_global_header==0 && (oc->oformat->flags & AVFMT_GLOBALHEADER))*/){
lavc_actx->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
if(lavc_param_audio_global_header&2){
lavc_actx->flags2 |= CODEC_FLAG2_LOCAL_HEADER;
}
if(avcodec_open(lavc_actx, lavc_acodec) < 0)
{
mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntOpenCodec, lavc_param_acodec, lavc_param_abitrate);
return 0;
}
if(lavc_param_atag == 0x11) {
lavc_actx->block_align = 2048;
lavc_actx->frame_size = (lavc_actx->block_align - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
}
encoder->decode_buffer_size = lavc_actx->frame_size * 2 * encoder->params.channels;
encoder->bind = bind_lavc;
encoder->get_frame_size = get_frame_size;
encoder->encode = encode_lavc;
encoder->close = close_lavc;
return 1;
}
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