转自：http://blog.chinaunix.net/uid-20718335-id-3194374.html
普通flv文件头信息中不带关键帧信息,在网页播放器中播放时,seek速度很慢,为了加快flv的seek速度,我们可以在flv的头信息中写入关键帧信息.
主要方法为;在写头信息时预留一定的位置用来写关键帧信息,在写包时包关键帧信息先保存起来,等到写文件结束时,根据需要把保存的关键帧信息写到预留的头信息中.
/*
* FLV muxer
* Copyright (c) 2003 The FFmpeg Project
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "stdafx.h"
#include "vxtempl.h"
extern "C"
{
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "avformat.h"
#include "flv.h"
#include "internal.h"
#include "avc.h"
#include "metadata.h"
#include "libavutil/dict.h"
#undef NDEBUG
#include <assert.h>
static const AVCodecTag flv_video_codec_ids[] = {
{CODEC_ID_FLV1, FLV_CODECID_H263 },
{CODEC_ID_H263, FLV_CODECID_REALH263},
{CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
{CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
{CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
{CODEC_ID_VP6F, FLV_CODECID_VP6 },
{CODEC_ID_VP6, FLV_CODECID_VP6 },
{CODEC_ID_H264, FLV_CODECID_H264 },
{CODEC_ID_NONE, 0}
};
static const AVCodecTag flv_audio_codec_ids[] = {
{CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
{CODEC_ID_NONE, 0}
};
#define MAX_FLV_KEY_FRAME 1500
typedef struct FLVContext {
int reserved;
double framerate;
int64_t duration_offset;
int64_t duration;
int64_t datasize_offset;
int64_t datasize;
int64_t videosize_offset;
int64_t videosize;
int64_t audiosize_offset;
int64_t audiosize;
int64_t filesize_offset;
int64_t delay; ///< first dts delay (needed for AVC & Speex)
int acurframeindex;
int64_t lasttimestamp_offset;
double lasttimestamp;
int64_t lastkeyframetimestamp_offset;
double lastkeyframetimestamp;
int64_t lastkeyframelocation_offset;
int64_t lastkeyframelocation;
int64_t filepositions_offset;
CVxArray<int64_t> filepositions;
int64_t filetimes_offset;
CVxArray<double> filetimes;
int64_t filetimesend_Pos;
int64_t datastart_offset;
} FLVContext;
typedef struct FLVStreamContext {
int64_t last_ts; ///< last timestamp for each stream
} FLVStreamContext;
static int get_audio_flags(AVCodecContext *enc){
int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
else if (enc->codec_id == CODEC_ID_SPEEX) {
if (enc->sample_rate != 16000) {
av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
return -1;
}
if (enc->channels != 1) {
av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
return -1;
}
return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
} else {
switch (enc->sample_rate) {
case 44100:
flags |= FLV_SAMPLERATE_44100HZ;
break;
case 22050:
flags |= FLV_SAMPLERATE_22050HZ;
break;
case 11025:
flags |= FLV_SAMPLERATE_11025HZ;
break;
case 16000: //nellymoser only
case 8000: //nellymoser only
case 5512: //not mp3
if(enc->codec_id != CODEC_ID_MP3){
flags |= FLV_SAMPLERATE_SPECIAL;
break;
}
default:
av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
return -1;
}
}
if (enc->channels > 1) {
flags |= FLV_STEREO;
}
switch(enc->codec_id){
case CODEC_ID_MP3:
flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
break;
case CODEC_ID_PCM_U8:
flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
break;
case CODEC_ID_PCM_S16BE:
flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
break;
case CODEC_ID_PCM_S16LE:
flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
break;
case CODEC_ID_ADPCM_SWF:
flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
break;
case CODEC_ID_NELLYMOSER:
if (enc->sample_rate == 8000) {
flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
} else if (enc->sample_rate == 16000) {
flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
} else {
flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
}
break;
case 0:
flags |= enc->codec_tag<<4;
break;
default:
av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
return -1;
}
return flags;
}
static void put_amf_string(AVIOContext *pb, const char *str)
{
size_t len = strlen(str);
avio_wb16(pb, len);
avio_write(pb, (const unsigned char *)str, len);
}
static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
avio_w8(pb, FLV_TAG_TYPE_VIDEO);
avio_wb24(pb, 5); /* Tag Data Size */
avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
avio_wb24(pb, 0); /* StreamId = 0 */
avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
avio_w8(pb, 2); /* AVC end of sequence */
avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
avio_wb32(pb, 16); /* Size of FLV tag */
}
static void put_amf_dword_array(AVIOContext *pb, DWORD dw)
{
avio_w8(pb, AMF_DATA_TYPE_ARRAY);
avio_wb32(pb, dw);
}
static void put_amf_double(AVIOContext *pb, double d)
{
avio_w8(pb, AMF_DATA_TYPE_NUMBER);
avio_wb64(pb, av_double2int(d));
}
static void put_amf_byte(AVIOContext *pb, BYTE abyte)
{
avio_w8(pb, abyte);
}
static void put_amf_bool(AVIOContext *pb, int b) {
avio_w8(pb, AMF_DATA_TYPE_BOOL);
avio_w8(pb, !!b);
}
static int flv_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
FLVContext *flv = (FLVContext*)s->priv_data;
AVCodecContext *audio_enc = NULL, *video_enc = NULL;
int i, metadata_count = 0;
double framerate = 0.0;
int64_t metadata_size_pos, data_size, metadata_count_pos;
AVDictionaryEntry *tag = NULL;
for(i=0; i<s->nb_streams; i++){
AVCodecContext *enc = s->streams[i]->codec;
FLVStreamContext *sc;
if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
framerate = av_q2d(s->streams[i]->r_frame_rate);
} else {
framerate = 1 / (av_q2d(s->streams[i]->codec->time_base) * s->streams[i]->codec->ticks_per_frame);
}
video_enc = enc;
if(enc->codec_tag == 0) {
av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
return -1;
}
} else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
audio_enc = enc;
if(get_audio_flags(enc)<0)
return -1;
}
avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
sc = (FLVStreamContext*)av_mallocz(sizeof(FLVStreamContext));
if (!sc)
return AVERROR(ENOMEM);
s->streams[i]->priv_data = sc;
sc->last_ts = -1;
}
flv->delay = AV_NOPTS_VALUE;
avio_write(pb, (const unsigned char*)"FLV", 3);
avio_w8(pb,1);
avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
+ FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
avio_wb32(pb,9);
avio_wb32(pb,0);
for(i=0; i<s->nb_streams; i++){
if(s->streams[i]->codec->codec_tag == 5){
avio_w8(pb,8); // message type
avio_wb24(pb,0); // include flags
avio_wb24(pb,0); // time stamp
avio_wb32(pb,0); // reserved
avio_wb32(pb,11); // size
flv->reserved=5;
}
}
/* write meta_tag */
avio_w8(pb, 18); // tag type META
metadata_size_pos = avio_tell(pb);
avio_wb24(pb, 0); // size of data part (sum of all parts below)
avio_wb24(pb, 0); // time stamp
avio_wb32(pb, 0); // reserved
/* now data of data_size size */
/* first event name as a string */
avio_w8(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, "onMetaData"); // 12 bytes
/* mixed array (hash) with size and string/type/data tuples */
avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
metadata_count_pos = avio_tell(pb);
metadata_count = 7 + 6*!!video_enc + 6*!!audio_enc + 1 + 4; // +2 for duration and file size
avio_wb32(pb, metadata_count);
/********** Add KeyFrame Index ***********************************/
put_amf_string(pb, "hasKeyframes");
put_amf_bool(pb, true);
put_amf_string(pb, "hasVideo");
put_amf_bool(pb, !!video_enc);
put_amf_string(pb, "hasAudio");
put_amf_bool(pb, !!audio_enc);
put_amf_string(pb, "hasMetadata");
put_amf_bool(pb, true);
put_amf_string(pb, "canSeekToEnd");
put_amf_bool(pb, false);
/************************************************************************/
put_amf_string(pb, "duration");
flv->duration_offset = avio_tell(pb);
put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
/********** Add KeyFrame Index ***********************************/
put_amf_string(pb, "datasize");
flv->datasize_offset = avio_tell(pb);
flv->datasize = 0;
put_amf_double(pb, 0); // delayed write
/************************************************************************/
if(video_enc)
{
/********** Add KeyFrame Index ***********************************/
put_amf_string(pb, "videosize");
flv->videosize_offset = avio_tell(pb);
flv->videosize = 0;
put_amf_double(pb, 0); // delayed write
/************************************************************************/
put_amf_string(pb, "videocodecid");
put_amf_double(pb, video_enc->codec_tag);
put_amf_string(pb, "width");
put_amf_double(pb, video_enc->width);
put_amf_string(pb, "height");
put_amf_double(pb, video_enc->height);
put_amf_string(pb, "framerate");
put_amf_double(pb, framerate);
put_amf_string(pb, "videodatarate");
put_amf_double(pb, video_enc->bit_rate / 1024.0);
}
if(audio_enc)
{
/********** Add KeyFrame Index ***********************************/
put_amf_string(pb, "audiosize");
flv->audiosize_offset = avio_tell(pb);
flv->audiosize = 0;
put_amf_double(pb, 0); // delayed write
/************************************************************************/
put_amf_string(pb, "audiocodecid");
put_amf_double(pb, audio_enc->codec_tag);
put_amf_string(pb, "audiosamplesize");
put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
put_amf_string(pb, "audiosamplerate");
put_amf_double(pb, audio_enc->sample_rate);
put_amf_string(pb, "stereo");
put_amf_bool(pb, audio_enc->channels == 2);
put_amf_string(pb, "audiodatarate");
put_amf_double(pb, audio_enc->bit_rate / 1024.0);
}
while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
if( !strcmp(tag->key, "width")
||!strcmp(tag->key, "height")
||!strcmp(tag->key, "videodatarate")
||!strcmp(tag->key, "framerate")
||!strcmp(tag->key, "videocodecid")
||!strcmp(tag->key, "audiodatarate")
||!strcmp(tag->key, "audiosamplerate")
||!strcmp(tag->key, "audiosamplesize")
||!strcmp(tag->key, "stereo")
||!strcmp(tag->key, "audiocodecid")
||!strcmp(tag->key, "duration")
||!strcmp(tag->key, "onMetaData")
){
av_log(s, AV_LOG_DEBUG, "ignoring metadata for %s\n", tag->key);
continue;
}
put_amf_string(pb, tag->key);
avio_w8(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, tag->value);
metadata_count++;
}
put_amf_string(pb, "filesize");
flv->filesize_offset = avio_tell(pb);
put_amf_double(pb, 0); // delayed write
/********** Add KeyFrame Index ***********************************/
flv->acurframeindex = 0;
flv->framerate = framerate;
put_amf_string(pb, "lasttimestamp");
flv->lasttimestamp_offset = avio_tell(pb);
flv->lasttimestamp = 0;
put_amf_double(pb, 0); // delayed write
put_amf_string(pb, "lastkeyframetimestamp");
flv->lastkeyframetimestamp_offset = avio_tell(pb);
flv->lastkeyframetimestamp = 0;
put_amf_double(pb, 0); // delayed write
put_amf_string(pb, "lastkeyframelocation");
flv->lastkeyframelocation_offset = avio_tell(pb);
flv->lastkeyframelocation = 0;
put_amf_double(pb, 0); // delayed write
put_amf_string(pb, "keyframes");
put_amf_byte(pb, AMF_DATA_TYPE_OBJECT);
put_amf_string(pb, "filepositions");
flv->filepositions_offset = avio_tell(pb);
put_amf_dword_array(pb, 0); // delayed write
flv->filepositions.RemoveAll();
for(int i = 0; i < MAX_FLV_KEY_FRAME; i++)
{
put_amf_double(pb, 0); // delayed write
}
put_amf_string(pb, "times");
flv->filetimes_offset = avio_tell(pb);
put_amf_dword_array(pb, 0); // delayed write
flv->filetimes.RemoveAll();
for(int i = 0; i < MAX_FLV_KEY_FRAME; i++)
{
put_amf_double(pb, 0); // delayed write
}
flv->filetimesend_Pos = avio_tell(pb);
/************************************************************************/
put_amf_string(pb, "");
avio_w8(pb, AMF_END_OF_OBJECT);
/* write total size of tag */
data_size= avio_tell(pb) - metadata_size_pos - 10;
avio_seek(pb, metadata_count_pos, SEEK_SET);
avio_wb32(pb, metadata_count);
avio_seek(pb, metadata_size_pos, SEEK_SET);
avio_wb24(pb, data_size);
avio_skip(pb, data_size + 10 - 3);
avio_wb32(pb, data_size + 11);
for (i = 0; i < s->nb_streams; i++) {
AVCodecContext *enc = s->streams[i]->codec;
if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
int64_t pos;
avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
avio_wb24(pb, 0); // size patched later
avio_wb24(pb, 0); // ts
avio_w8(pb, 0); // ts ext
avio_wb24(pb, 0); // streamid
pos = avio_tell(pb);
if (enc->codec_id == CODEC_ID_AAC) {
avio_w8(pb, get_audio_flags(enc));
avio_w8(pb, 0); // AAC sequence header
avio_write(pb, enc->extradata, enc->extradata_size);
} else {
avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
avio_w8(pb, 0); // AVC sequence header
avio_wb24(pb, 0); // composition time
ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
}
data_size = avio_tell(pb) - pos;
avio_seek(pb, -data_size - 10, SEEK_CUR);
avio_wb24(pb, data_size);
avio_skip(pb, data_size + 10 - 3);
avio_wb32(pb, data_size + 11); // previous tag size
}
}
/********** Add KeyFrame Index ***********************************/
flv->datastart_offset = avio_tell(pb);
/************************************************************************/
return 0;
}
static int flv_write_trailer(AVFormatContext *s)
{
int64_t file_size;
AVIOContext *pb = s->pb;
FLVContext *flv = (FLVContext*)s->priv_data;
int i;
/* Add EOS tag */
for (i = 0; i < s->nb_streams; i++) {
AVCodecContext *enc = s->streams[i]->codec;
FLVStreamContext *sc = (FLVStreamContext*)s->streams[i]->priv_data;
if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
(enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)) {
put_avc_eos_tag(pb, sc->last_ts);
}
}
file_size = avio_tell(pb);
flv->datasize = file_size - flv->datastart_offset;
/* update information */
avio_seek(pb, flv->duration_offset, SEEK_SET);
put_amf_double(pb, flv->duration / (double)1000);
/********** Add KeyFrame Index ***********************************/
avio_seek(pb, flv->datasize_offset, SEEK_SET);
put_amf_double(pb, flv->datasize);
avio_seek(pb, flv->videosize_offset, SEEK_SET);
put_amf_double(pb, flv->videosize);
avio_seek(pb, flv->audiosize_offset, SEEK_SET);
put_amf_double(pb, flv->audiosize);
/************************************************************************/
avio_seek(pb, flv->filesize_offset, SEEK_SET);
put_amf_double(pb, file_size);
/********** Add KeyFrame Index ***********************************/
avio_seek(pb, flv->lasttimestamp_offset, SEEK_SET);
put_amf_double(pb, flv->lasttimestamp);
avio_seek(pb, flv->lastkeyframetimestamp_offset, SEEK_SET);
put_amf_double(pb, flv->lastkeyframetimestamp);
avio_seek(pb, flv->lastkeyframelocation_offset, SEEK_SET);
put_amf_double(pb, flv->lastkeyframelocation);
int vKeyFrames = flv->filepositions.GetSize();
if (vKeyFrames < MAX_FLV_KEY_FRAME)
{
DWORD vfilepositions = flv->filepositions.GetSize();
avio_seek(pb, flv->filepositions_offset, SEEK_SET);
put_amf_dword_array(pb, vfilepositions);
for(int i = 0; i < vKeyFrames; i++)
{
double afilepositions = flv->filepositions.GetAt(i);
put_amf_double(pb, afilepositions);
}
// times 向¨°前¡ã移°?动¡¥
put_amf_string(pb, "times");
flv->filetimes_offset = avio_tell(pb);
DWORD vfiletimes = flv->filetimes.GetSize();
avio_seek(pb, flv->filetimes_offset, SEEK_SET);
put_amf_dword_array(pb, vfiletimes);
for(int i = 0; i < vKeyFrames; i++)
{
double afiletimes = flv->filetimes.GetAt(i);
put_amf_double(pb, afiletimes);
}
// 后¨®面?的Ì?数ºy据Y清?0
int64_t vcurfile_Pos = avio_tell(pb);
int vbytecount = flv->filetimesend_Pos - vcurfile_Pos;
for (int i = 0; i < vbytecount; i++)
{
put_amf_byte(pb, 0);
}
}
else
{
double dbStep = 1.0 * vKeyFrames / MAX_FLV_KEY_FRAME;
DWORD vfilepositions = MAX_FLV_KEY_FRAME;
avio_seek(pb, flv->filepositions_offset, SEEK_SET);
put_amf_dword_array(pb, vfilepositions);
for(int i = 0; i < MAX_FLV_KEY_FRAME; i++)
{
int vIndex = int(dbStep * i);
double afilepositions = flv->filepositions.GetAt(vIndex);
put_amf_double(pb, afilepositions);
}
DWORD vfiletimes = MAX_FLV_KEY_FRAME;
avio_seek(pb, flv->filetimes_offset, SEEK_SET);
put_amf_dword_array(pb, vfiletimes);
for(int i = 0; i < MAX_FLV_KEY_FRAME; i++)
{
int vIndex = int(dbStep * i);
double afiletimes = flv->filetimes.GetAt(vIndex);
put_amf_double(pb, afiletimes);
}
}
flv->filepositions.RemoveAll();
flv->filetimes.RemoveAll();
/************************************************************************/
avio_seek(pb, file_size, SEEK_SET);
return 0;
}
static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
FLVContext *flv = (FLVContext*)s->priv_data;
FLVStreamContext *sc = (FLVStreamContext*)s->streams[pkt->stream_index]->priv_data;
unsigned ts;
int size= pkt->size;
uint8_t *data= NULL;
int flags, flags_size;
/********** Add KeyFrame Index ***********************************/
int64_t vbegin_offset = avio_tell(pb);
/************************************************************************/
// av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
enc->codec_id == CODEC_ID_AAC)
flags_size= 2;
else if(enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)
flags_size= 5;
else
flags_size= 1;
if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
avio_w8(pb, FLV_TAG_TYPE_VIDEO);
flags = enc->codec_tag;
if(flags == 0) {
av_log(enc, AV_LOG_ERROR, "video codec %s not compatible with flv\n", avcodec_get_name(enc->codec_id));
return -1;
}
flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
} else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
flags = get_audio_flags(enc);
assert(size);
avio_w8(pb, FLV_TAG_TYPE_AUDIO);
} else {
// In-band flv metadata ("scriptdata")
assert(enc->codec_type == AVMEDIA_TYPE_DATA);
avio_w8(pb, FLV_TAG_TYPE_META);
flags_size = 0;
flags = 0;
}
if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
/* check if extradata looks like mp4 formated */
if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
return -1;
}
} else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
(AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
return -1;
}
if (flv->delay == AV_NOPTS_VALUE)
flv->delay = -pkt->dts;
if (pkt->dts < -flv->delay) {
av_log(s, AV_LOG_WARNING, "Packets are not in the proper order with "
"respect to DTS\n");
return AVERROR(EINVAL);
}
ts = pkt->dts + flv->delay; // add delay to force positive dts
/* check Speex packet duration */
if (enc->codec_id == CODEC_ID_SPEEX && ts - sc->last_ts > 160) {
av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
"8 frames per packet. Adobe Flash "
"Player cannot handle this!\n");
}
if (sc->last_ts < ts)
sc->last_ts = ts;
avio_wb24(pb,size + flags_size);
avio_wb24(pb,ts);
avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
avio_wb24(pb,flv->reserved);
if(flags_size)
avio_w8(pb,flags);
if (enc->codec_id == CODEC_ID_VP6)
avio_w8(pb,0);
if (enc->codec_id == CODEC_ID_VP6F)
avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
else if (enc->codec_id == CODEC_ID_AAC)
avio_w8(pb,1); // AAC raw
else if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
avio_w8(pb,1); // AVC NALU
avio_wb24(pb,pkt->pts - pkt->dts);
}
avio_write(pb, data ? data : pkt->data, size);
avio_wb32(pb,size+flags_size+11); // previous tag size
flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
/********** Add KeyFrame Index ***********************************/
if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
{
flv->videosize += (avio_tell(pb) - vbegin_offset);
flv->lasttimestamp = flv->acurframeindex / flv->framerate;
if (pkt->flags & AV_PKT_FLAG_KEY)
{
flv->lastkeyframelocation = vbegin_offset;
flv->lastkeyframetimestamp = flv->acurframeindex / flv->framerate;
flv->filepositions.Add(flv->lastkeyframelocation);
flv->filetimes.Add(flv->lastkeyframetimestamp);
}
flv->acurframeindex++;
}
else if (enc->codec_type == AVMEDIA_TYPE_AUDIO)
{
flv->audiosize += (avio_tell(pb) - vbegin_offset);
}
/************************************************************************/
avio_flush(pb);
av_free(data);
return pb->error;
}
static AVCodecTag* ff_flv_tag[] = {(AVCodecTag*)flv_video_codec_ids, (AVCodecTag*)flv_audio_codec_ids, 0};
AVOutputFormat my_ff_flv_muxer = {
"flv",
"FLV format",
"video/x-flv",
"flv",
sizeof(FLVContext),
CODEC_ID_ADPCM_SWF,
CODEC_ID_FLV1,
flv_write_header,
flv_write_packet,
flv_write_trailer,
AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
NULL,
NULL,
ff_flv_tag,
};
};