mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
374 lines
10 KiB
374 lines
10 KiB
/* |
|
* 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" |
|
|
|
#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 ); |
|
put_byte(pb, (value>> 8) & 0xFF ); |
|
put_byte(pb, (value>> 0) & 0xFF ); |
|
} |
|
|
|
static int flv_write_header(AVFormatContext *s) |
|
{ |
|
ByteIOContext *pb = &s->pb; |
|
FLVContext *flv = s->priv_data; |
|
int i; |
|
|
|
av_set_pts_info(s, 24, 1, 1000); /* 24 bit pts in ms */ |
|
|
|
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 |
|
put_be32(pb,9); |
|
put_be32(pb,0); |
|
|
|
for(i=0; i<s->nb_streams; i++){ |
|
AVCodecContext *enc = &s->streams[i]->codec; |
|
if(enc->codec_tag == 5){ |
|
put_byte(pb,8); // message type |
|
put_be24(pb,0); // include flags |
|
put_be24(pb,0); // time stamp |
|
put_be32(pb,0); // reserved |
|
put_be32(pb,11); // size |
|
flv->reserved=5; |
|
} |
|
} |
|
|
|
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; |
|
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, |
|
const uint8_t *buf, int size, int64_t timestamp) |
|
{ |
|
ByteIOContext *pb = &s->pb; |
|
AVCodecContext *enc = &s->streams[stream_index]->codec; |
|
FLVContext *flv = s->priv_data; |
|
FLVFrame *frame = av_malloc(sizeof(FLVFrame)); |
|
|
|
frame->next = 0; |
|
frame->size = size; |
|
frame->data = av_malloc(size); |
|
frame->timestamp = timestamp; |
|
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 |= enc->coded_frame->key_frame ? 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); |
|
flv->hasVideo = 1; |
|
|
|
InsertSorted(flv,frame); |
|
|
|
flv->frameCount ++; |
|
} |
|
else if (enc->codec_type == CODEC_TYPE_AUDIO) { |
|
int soundFormat = 0x02; |
|
|
|
switch (enc->sample_rate) { |
|
case 44100: |
|
soundFormat |= 0x0C; |
|
break; |
|
case 22050: |
|
soundFormat |= 0x08; |
|
break; |
|
case 11025: |
|
soundFormat |= 0x04; |
|
break; |
|
case 8000: //nellymoser only |
|
case 5512: //not mp3 |
|
soundFormat |= 0x00; |
|
break; |
|
default: |
|
assert(0); |
|
} |
|
|
|
if (enc->channels > 1) { |
|
soundFormat |= 0x01; |
|
} |
|
|
|
switch(enc->codec_id){ |
|
case CODEC_ID_MP3: |
|
soundFormat |= 0x20; |
|
break; |
|
case 0: |
|
soundFormat |= enc->codec_tag<<4; |
|
break; |
|
default: |
|
assert(0); |
|
} |
|
|
|
assert(size); |
|
if ( flv->initDelay == -1 ) { |
|
flv->initDelay = timestamp; |
|
} |
|
|
|
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 |
|
|
|
// 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_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; |
|
}
|
|
|