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FFmpeg
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simplify 

Originally committed as revision 3252 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Michael Niedermayer 21 years ago
parent
ee0c00d3b4
commit
75293f05f9
1 changed files with 24 additions and 221 deletions
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  1. +24
    -221
      libavformat/flvenc.c

+ 24
- 221
libavformat/flvenc.c View File

@@ -21,106 +21,12 @@
#undef NDEBUG
#include <assert.h>

#define VIDEO_FIFO_SIZE 512

typedef struct FLVFrame {
int type;
int timestamp;
int reserved;
int flags;
uint8_t *data;
int size;
struct FLVFrame *next;
} FLVFrame;

typedef struct FLVContext {
int hasAudio;
int hasVideo;
int initDelay;
int64_t sampleCount;
int64_t frameCount;
int reserved;
FLVFrame *frames;
} FLVContext;

#ifdef CONFIG_MP3LAME

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 ) {
//MPEG1
*sampleRate = sSampleRates[0][sampleRateID];
bitRate = sBitRates[0][layerID][bitRateID] * 1000;
*samplesPerFrame = sSamplesPerFrame[0][layerID];
} else {
if ( (header >> 20) & 0x01 ) {
//MPEG2
*sampleRate = sSampleRates[1][sampleRateID];
bitRate = sBitRates[1][layerID][bitRateID] * 1000;
*samplesPerFrame = sSamplesPerFrame[1][layerID];
} else {
//MPEG2.5
*sampleRate = sSampleRates[2][sampleRateID];
bitRate = sBitRates[1][layerID][bitRateID] * 1000;
*samplesPerFrame = sSamplesPerFrame[2][layerID];
}
}
*byteSize = ( ( ( ( *samplesPerFrame * (bitRate / bitsPerSlot) ) / *sampleRate ) + isPadded ) );
return 1;
}
#endif // CONFIG_MP3LAME

static void put_be24(ByteIOContext *pb, int value)
{
put_byte(pb, (value>>16) & 0xFF );
@@ -137,10 +43,6 @@ static int flv_write_header(AVFormatContext *s)
flv->hasAudio = 0;
flv->hasVideo = 0;

flv->initDelay = -1;

flv->frames = 0;

put_tag(pb,"FLV");
put_byte(pb,1);
put_byte(pb,0); // delayed write
@@ -163,63 +65,6 @@ static int flv_write_header(AVFormatContext *s)
return 0;
}

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)
{
//av_log(NULL, AV_LOG_DEBUG, "T%02X S%d T%d R%d F%02X ... R%08X\n", frame->type, frame->size+1, frame->timestamp, 0, frame->flags, frame->size+1+11);
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,frame->reserved); // 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;
@@ -228,8 +73,6 @@ static int flv_write_trailer(AVFormatContext *s)
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;
@@ -244,108 +87,68 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
ByteIOContext *pb = &s->pb;
AVCodecContext *enc = &s->streams[pkt->stream_index]->codec;
FLVContext *flv = s->priv_data;
FLVFrame *frame = av_malloc(sizeof(FLVFrame));
int size= pkt->size;
uint8_t *buf= pkt->data;
int flags;

frame->next = 0;
frame->size = size;
frame->data = av_malloc(size);
frame->timestamp = pkt->pts;
frame->reserved= flv->reserved;
memcpy(frame->data,buf,size);
// av_log(s, AV_LOG_DEBUG, "type:%d pts: %lld size:%d\n", enc->codec_type, timestamp, size);
if (enc->codec_type == CODEC_TYPE_VIDEO) {
frame->type = 9;
frame->flags = 2; // choose h263
frame->flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator
//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);
put_byte(pb, 9);
flags = 2; // choose h263
flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator
flv->hasVideo = 1;

InsertSorted(flv,frame);

flv->frameCount ++;
}
else if (enc->codec_type == CODEC_TYPE_AUDIO) {
int soundFormat = 0x02;
} else {
assert(enc->codec_type == CODEC_TYPE_AUDIO);
flags = 0x02;

switch (enc->sample_rate) {
case 44100:
soundFormat |= 0x0C;
flags |= 0x0C;
break;
case 22050:
soundFormat |= 0x08;
flags |= 0x08;
break;
case 11025:
soundFormat |= 0x04;
flags |= 0x04;
break;
case 8000: //nellymoser only
case 5512: //not mp3
soundFormat |= 0x00;
flags |= 0x00;
break;
default:
assert(0);
}

if (enc->channels > 1) {
soundFormat |= 0x01;
flags |= 0x01;
}
switch(enc->codec_id){
case CODEC_ID_MP3:
soundFormat |= 0x20;
flags |= 0x20;
break;
case 0:
soundFormat |= enc->codec_tag<<4;
flags |= enc->codec_tag<<4;
break;
default:
assert(0);
}

assert(size);
if ( flv->initDelay == -1 ) {
flv->initDelay = pkt->pts;
}

frame->type = 8;
frame->flags = soundFormat;

// if ( flv->audioTime == -1 ) {
// flv->audioTime = ( ( ( flv->sampleCount - enc->delay ) * 8000 ) / flv->audioRate ) - flv->initDelay - 250;
// if ( flv->audioTime < 0 ) {
// flv->audioTime = 0;
// }
// }

#ifdef CONFIG_MP3LAME
if (enc->codec_id == CODEC_ID_MP3 ) {
int mp3FrameSize = 0;
int mp3SampleRate = 0;
int mp3IsMono = 0;
int mp3SamplesPerFrame = 0;

/* copy out mp3 header from ring buffer */
if(!mp3info(buf,&mp3FrameSize,&mp3SamplesPerFrame,&mp3SampleRate,&mp3IsMono))
assert(0);
assert ( size == mp3FrameSize );
assert(enc->sample_rate == mp3SampleRate);
// assert(enc->frame_size == mp3SamplesPerFrame);
//av_log(NULL, AV_LOG_DEBUG, "sizes: %d %d\n", enc->frame_size, mp3SamplesPerFrame);

frame->timestamp = (1000*flv->sampleCount + enc->sample_rate/2)/(enc->sample_rate);
flv->sampleCount += mp3SamplesPerFrame;
}
#endif
put_byte(pb, 8);

// We got audio! Make sure we set this to the global flags on closure
flv->hasAudio = 1;
InsertSorted(flv,frame);
}else
assert(0);
Dump(flv,pb,128);
}

put_be24(pb,size+1); // include flags
put_be24(pb,pkt->pts);
put_be32(pb,flv->reserved);
put_byte(pb,flags);
put_buffer(pb, pkt->data, size);
put_be32(pb,size+1+11); // reserved

put_flush_packet(pb);
return 0;
}


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