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ffmpeg/libavformat/flvenc.c

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/*
* FLV encoder.
* Copyright (c) 2003 The FFmpeg Project.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avformat.h"
#define VIDEO_FIFO_SIZE 512
typedef struct FLVFrame {
int type;
int timestamp;
int flags;
uint8_t *data;
int size;
struct FLVFrame *next;
} FLVFrame;
typedef struct FLVContext {
int hasAudio;
int hasVideo;
#ifdef CONFIG_MP3LAME
int audioTime;
int audioInPos;
int audioOutPos;
int audioSize;
int audioRate;
int initDelay;
int soundDelay;
uint8_t *audioFifo;
int64_t sampleCount;
#endif // CONFIG_MP3LAME
int64_t frameCount;
FLVFrame *frames;
} FLVContext;
#ifdef CONFIG_MP3LAME
#define AUDIO_FIFO_SIZE 65536
static const int sSampleRates[3][4] = {
{44100, 48000, 32000, 0},
{22050, 24000, 16000, 0},
{11025, 12000, 8000, 0},
};
static const int sBitRates[2][3][15] = {
{ { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448},
{ 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384},
{ 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}
},
{ { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256},
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160},
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}
},
};
static const int sSamplesPerFrame[3][3] =
{
{ 384, 1152, 1152 },
{ 384, 1152, 576 },
{ 384, 1152, 576 }
};
static const int sBitsPerSlot[3] = {
32,
8,
8
};
static int mp3info(void *data, int *byteSize, int *samplesPerFrame, int *sampleRate, int *isMono )
{
uint8_t *dataTmp = (uint8_t *)data;
uint32_t header = ( (uint32_t)dataTmp[0] << 24 ) | ( (uint32_t)dataTmp[1] << 16 ) | ( (uint32_t)dataTmp[2] << 8 ) | (uint32_t)dataTmp[3];
int layerID = 3 - ((header >> 17) & 0x03);
int bitRateID = ((header >> 12) & 0x0f);
int sampleRateID = ((header >> 10) & 0x03);
int bitRate = 0;
int bitsPerSlot = sBitsPerSlot[layerID];
int isPadded = ((header >> 9) & 0x01);
if ( (( header >> 21 ) & 0x7ff) != 0x7ff ) {
return 0;
}
if ( !isPadded ) {
printf("Fatal error: mp3 data is not padded!\n");
exit(0);
}
*isMono = ((header >> 6) & 0x03) == 0x03;
if ( (header >> 19 ) & 0x01 ) {
*sampleRate = sSampleRates[0][sampleRateID];
bitRate = sBitRates[0][layerID][bitRateID] * 1000;
*samplesPerFrame = sSamplesPerFrame[0][layerID];
} else {
if ( (header >> 20) & 0x01 ) {
*sampleRate = sSampleRates[1][sampleRateID];
bitRate = sBitRates[1][layerID][bitRateID] * 1000;
*samplesPerFrame = sSamplesPerFrame[1][layerID];
} else {
*sampleRate = sSampleRates[2][sampleRateID];
bitRate = sBitRates[1][layerID][bitRateID] * 1000;
*samplesPerFrame = sSamplesPerFrame[2][layerID];
}
}
*byteSize = ( ( ( ( *samplesPerFrame * (bitRate / bitsPerSlot) ) / *sampleRate ) + isPadded ) * bitsPerSlot);
return 1;
}
#endif // CONFIG_MP3LAME
static int flv_write_header(AVFormatContext *s)
{
ByteIOContext *pb = &s->pb;
FLVContext *flv = s->priv_data;
av_set_pts_info(s, 24, 1, 1000); /* 24 bit pts in ms */
flv->hasAudio = 0;
flv->hasVideo = 0;
#ifdef CONFIG_MP3LAME
flv->audioTime = -1;
flv->audioFifo = av_malloc(AUDIO_FIFO_SIZE);
flv->audioInPos = 0;
flv->audioOutPos = 0;
flv->audioSize = 0;
flv->audioRate = 44100;
flv->initDelay = -1;
flv->soundDelay = 0;
#endif // CONFIG_MP3LAME
flv->frames = 0;
put_tag(pb,"FLV");
put_byte(pb,1);
put_byte(pb,0); // delayed write
put_be32(pb,9);
put_be32(pb,0);
return 0;
}
static void put_be24(ByteIOContext *pb, int value)
{
put_byte(pb, (value>>16) & 0xFF );
put_byte(pb, (value>> 8) & 0xFF );
put_byte(pb, (value>> 0) & 0xFF );
}
static void InsertSorted(FLVContext *flv, FLVFrame *frame)
{
if ( !flv->frames ) {
flv->frames = frame;
} else {
FLVFrame *trav = flv->frames;
FLVFrame *prev = 0;
for (;trav;) {
if ( trav->timestamp >= frame->timestamp ) {
frame->next = trav;
if ( prev ) {
prev->next = frame;
} else {
flv->frames = frame;
}
break;
}
prev = trav;
trav = trav->next;
}
if ( !trav ) {
prev->next = frame;
}
}
}
static void DumpFrame(ByteIOContext *pb, FLVFrame *frame)
{
put_byte(pb,frame->type); // message type
put_be24(pb,frame->size+1); // include flags
put_be24(pb,frame->timestamp); // time stamp
put_be32(pb,0); // reserved
put_byte(pb,frame->flags);
put_buffer(pb, frame->data, frame->size);
put_be32(pb,frame->size+1+11); // reserved
av_free(frame->data);
}
static void Dump(FLVContext *flv, ByteIOContext *pb, int count)
{
int c=0;
FLVFrame *trav = flv->frames;
FLVFrame *prev = 0;
for (;trav;c++) {
trav = trav->next;
}
trav = flv->frames;
for ( ; c >= count; c-- ) {
DumpFrame(pb,trav);
prev = trav;
trav = trav->next;
av_free(prev);
}
flv->frames = trav;
}
static int flv_write_trailer(AVFormatContext *s)
{
int64_t file_size;
int flags = 0;
ByteIOContext *pb = &s->pb;
FLVContext *flv = s->priv_data;
Dump(flv,pb,1);
file_size = url_ftell(pb);
flags |= flv->hasAudio ? 4 : 0;
flags |= flv->hasVideo ? 1 : 0;
url_fseek(pb, 4, SEEK_SET);
put_byte(pb,flags);
url_fseek(pb, file_size, SEEK_SET);
return 0;
}
static int flv_write_packet(AVFormatContext *s, int stream_index,
uint8_t *buf, int size, int timestamp)
{
ByteIOContext *pb = &s->pb;
AVCodecContext *enc = &s->streams[stream_index]->codec;
FLVContext *flv = s->priv_data;
if (enc->codec_type == CODEC_TYPE_VIDEO) {
FLVFrame *frame = av_malloc(sizeof(FLVFrame));
frame->next = 0;
frame->type = 9;
frame->flags = 2; // choose h263
frame->flags |= enc->coded_frame->key_frame ? 0x10 : 0x20; // add keyframe indicator
frame->timestamp = timestamp;
//frame->timestamp = ( ( flv->frameCount * (int64_t)FRAME_RATE_BASE * (int64_t)1000 ) / (int64_t)enc->frame_rate );
//printf("%08x %f %f\n",frame->timestamp,(double)enc->frame_rate/(double)FRAME_RATE_BASE,1000*(double)FRAME_RATE_BASE/(double)enc->frame_rate);
frame->size = size;
frame->data = av_malloc(size);
memcpy(frame->data,buf,size);
flv->hasVideo = 1;
InsertSorted(flv,frame);
flv->frameCount ++;
}
else if (enc->codec_type == CODEC_TYPE_AUDIO) {
#ifdef CONFIG_MP3LAME
if (enc->codec_id == CODEC_ID_MP3 ) {
int c=0;
for (;c<size;c++) {
flv->audioFifo[(flv->audioOutPos+c)%AUDIO_FIFO_SIZE] = buf[c];
}
flv->audioSize += size;
flv->audioOutPos += size;
flv->audioOutPos %= AUDIO_FIFO_SIZE;
if ( flv->initDelay == -1 ) {
flv->initDelay = timestamp;
}
if ( flv->audioTime == -1 ) {
flv->audioTime = timestamp;
// flv->audioTime = ( ( ( flv->sampleCount - enc->delay ) * 8000 ) / flv->audioRate ) - flv->initDelay - 250;
// if ( flv->audioTime < 0 ) {
// flv->audioTime = 0;
// }
}
}
for ( ; flv->audioSize >= 4 ; ) {
int mp3FrameSize = 0;
int mp3SampleRate = 0;
int mp3IsMono = 0;
int mp3SamplesPerFrame = 0;
if ( mp3info(&flv->audioFifo[flv->audioInPos],&mp3FrameSize,&mp3SamplesPerFrame,&mp3SampleRate,&mp3IsMono) ) {
if ( flv->audioSize >= mp3FrameSize ) {
int soundFormat = 0x22;
int c=0;
FLVFrame *frame = av_malloc(sizeof(FLVFrame));
flv->audioRate = mp3SampleRate;
switch (mp3SampleRate) {
case 44100:
soundFormat |= 0x0C;
break;
case 22050:
soundFormat |= 0x08;
break;
case 11025:
soundFormat |= 0x04;
break;
}
if ( !mp3IsMono ) {
soundFormat |= 0x01;
}
frame->next = 0;
frame->type = 8;
frame->flags = soundFormat;
frame->timestamp = flv->audioTime;
frame->size = mp3FrameSize;
frame->data = av_malloc(mp3FrameSize);
for (;c<mp3FrameSize;c++) {
frame->data[c] = flv->audioFifo[(flv->audioInPos+c)%AUDIO_FIFO_SIZE];
}
flv->audioInPos += mp3FrameSize;
flv->audioSize -= mp3FrameSize;
flv->audioInPos %= AUDIO_FIFO_SIZE;
flv->sampleCount += mp3SamplesPerFrame;
// Reset audio for next round
flv->audioTime = -1;
// We got audio! Make sure we set this to the global flags on closure
flv->hasAudio = 1;
InsertSorted(flv,frame);
}
break;
}
flv->audioInPos ++;
flv->audioSize --;
flv->audioInPos %= AUDIO_FIFO_SIZE;
// no audio in here!
flv->audioTime = -1;
}
#endif
}
Dump(flv,pb,128);
put_flush_packet(pb);
return 0;
}
static AVOutputFormat flv_oformat = {
"flv",
"flv format",
"video/x-flashvideo",
"flv",
sizeof(FLVContext),
#ifdef CONFIG_MP3LAME
CODEC_ID_MP3,
#else // CONFIG_MP3LAME
CODEC_ID_NONE,
#endif // CONFIG_MP3LAME
CODEC_ID_FLV1,
flv_write_header,
flv_write_packet,
flv_write_trailer,
};
int flvenc_init(void)
{
av_register_output_format(&flv_oformat);
return 0;
}
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