mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 20:19:55 +00:00
337 lines
9.9 KiB
C
337 lines
9.9 KiB
C
/*
|
|
* 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 "avformat.h"
|
|
#include "flv.h"
|
|
#include "riff.h"
|
|
|
|
#undef NDEBUG
|
|
#include <assert.h>
|
|
|
|
static const AVCodecTag flv_video_codec_ids[] = {
|
|
{CODEC_ID_FLV1, FLV_CODECID_H263 },
|
|
{CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
|
|
{CODEC_ID_VP6F, FLV_CODECID_VP6 },
|
|
{CODEC_ID_VP6, FLV_CODECID_VP6 },
|
|
{CODEC_ID_NONE, 0}
|
|
};
|
|
|
|
static const AVCodecTag flv_audio_codec_ids[] = {
|
|
{CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
|
|
{CODEC_ID_PCM_S8, FLV_CODECID_PCM_BE >> FLV_AUDIO_CODECID_OFFSET},
|
|
{CODEC_ID_PCM_S16BE, FLV_CODECID_PCM_BE >> 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_NONE, 0}
|
|
};
|
|
|
|
typedef struct FLVContext {
|
|
int hasAudio;
|
|
int hasVideo;
|
|
int reserved;
|
|
offset_t duration_offset;
|
|
offset_t filesize_offset;
|
|
int64_t duration;
|
|
} FLVContext;
|
|
|
|
static int get_audio_flags(AVCodecContext *enc){
|
|
int flags = (enc->bits_per_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
|
|
|
|
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 8000: //nellymoser only
|
|
case 5512: //not mp3
|
|
flags |= FLV_SAMPLERATE_SPECIAL;
|
|
break;
|
|
default:
|
|
av_log(enc, AV_LOG_ERROR, "flv doesnt 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_S8:
|
|
flags |= FLV_CODECID_PCM_BE | FLV_SAMPLESSIZE_8BIT;
|
|
break;
|
|
case CODEC_ID_PCM_S16BE:
|
|
flags |= FLV_CODECID_PCM_BE | 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;
|
|
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(ByteIOContext *pb, const char *str)
|
|
{
|
|
size_t len = strlen(str);
|
|
put_be16(pb, len);
|
|
put_buffer(pb, str, len);
|
|
}
|
|
|
|
static void put_amf_double(ByteIOContext *pb, double d)
|
|
{
|
|
put_byte(pb, AMF_DATA_TYPE_NUMBER);
|
|
put_be64(pb, av_dbl2int(d));
|
|
}
|
|
|
|
static void put_amf_bool(ByteIOContext *pb, int b) {
|
|
put_byte(pb, AMF_DATA_TYPE_BOOL);
|
|
put_byte(pb, !!b);
|
|
}
|
|
|
|
static int flv_write_header(AVFormatContext *s)
|
|
{
|
|
ByteIOContext *pb = &s->pb;
|
|
FLVContext *flv = s->priv_data;
|
|
int i, width, height, samplerate, samplesize, channels, audiocodecid, videocodecid;
|
|
double framerate = 0.0;
|
|
int metadata_size_pos, data_size;
|
|
|
|
flv->hasAudio = 0;
|
|
flv->hasVideo = 0;
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVCodecContext *enc = s->streams[i]->codec;
|
|
if (enc->codec_type == CODEC_TYPE_VIDEO) {
|
|
width = enc->width;
|
|
height = enc->height;
|
|
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);
|
|
}
|
|
flv->hasVideo=1;
|
|
|
|
videocodecid = enc->codec_tag;
|
|
if(videocodecid == 0) {
|
|
av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
|
|
return -1;
|
|
}
|
|
} else {
|
|
flv->hasAudio=1;
|
|
samplerate = enc->sample_rate;
|
|
channels = enc->channels;
|
|
|
|
audiocodecid = enc->codec_tag;
|
|
samplesize = (enc->codec_id == CODEC_ID_PCM_S8) ? 8 : 16;
|
|
|
|
if(get_audio_flags(enc)<0)
|
|
return -1;
|
|
}
|
|
av_set_pts_info(s->streams[i], 24, 1, 1000); /* 24 bit pts in ms */
|
|
}
|
|
put_tag(pb,"FLV");
|
|
put_byte(pb,1);
|
|
put_byte(pb, FLV_HEADER_FLAG_HASAUDIO * flv->hasAudio
|
|
+ FLV_HEADER_FLAG_HASVIDEO * flv->hasVideo);
|
|
put_be32(pb,9);
|
|
put_be32(pb,0);
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
if(s->streams[i]->codec->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;
|
|
}
|
|
}
|
|
|
|
/* write meta_tag */
|
|
put_byte(pb, 18); // tag type META
|
|
metadata_size_pos= url_ftell(pb);
|
|
put_be24(pb, 0); // size of data part (sum of all parts below)
|
|
put_be24(pb, 0); // time stamp
|
|
put_be32(pb, 0); // reserved
|
|
|
|
/* now data of data_size size */
|
|
|
|
/* first event name as a string */
|
|
put_byte(pb, AMF_DATA_TYPE_STRING);
|
|
put_amf_string(pb, "onMetaData"); // 12 bytes
|
|
|
|
/* mixed array (hash) with size and string/type/data tuples */
|
|
put_byte(pb, AMF_DATA_TYPE_MIXEDARRAY);
|
|
put_be32(pb, 5*flv->hasVideo + 4*flv->hasAudio + 2); // +2 for duration and file size
|
|
|
|
put_amf_string(pb, "duration");
|
|
flv->duration_offset= url_ftell(pb);
|
|
put_amf_double(pb, 0); // delayed write
|
|
|
|
if(flv->hasVideo){
|
|
put_amf_string(pb, "width");
|
|
put_amf_double(pb, width);
|
|
|
|
put_amf_string(pb, "height");
|
|
put_amf_double(pb, height);
|
|
|
|
put_amf_string(pb, "videodatarate");
|
|
put_amf_double(pb, s->bit_rate / 1024.0);
|
|
|
|
put_amf_string(pb, "framerate");
|
|
put_amf_double(pb, framerate);
|
|
|
|
put_amf_string(pb, "videocodecid");
|
|
put_amf_double(pb, videocodecid);
|
|
}
|
|
|
|
if(flv->hasAudio){
|
|
put_amf_string(pb, "audiosamplerate");
|
|
put_amf_double(pb, samplerate);
|
|
|
|
put_amf_string(pb, "audiosamplesize");
|
|
put_amf_double(pb, samplesize);
|
|
|
|
put_amf_string(pb, "stereo");
|
|
put_amf_bool(pb, (channels == 2));
|
|
|
|
put_amf_string(pb, "audiocodecid");
|
|
put_amf_double(pb, audiocodecid);
|
|
}
|
|
|
|
put_amf_string(pb, "filesize");
|
|
flv->filesize_offset= url_ftell(pb);
|
|
put_amf_double(pb, 0); // delayed write
|
|
|
|
put_amf_string(pb, "");
|
|
put_byte(pb, AMF_END_OF_OBJECT);
|
|
|
|
/* write total size of tag */
|
|
data_size= url_ftell(pb) - metadata_size_pos - 10;
|
|
url_fseek(pb, metadata_size_pos, SEEK_SET);
|
|
put_be24(pb, data_size);
|
|
url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
|
|
put_be32(pb, data_size + 11);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flv_write_trailer(AVFormatContext *s)
|
|
{
|
|
int64_t file_size;
|
|
|
|
ByteIOContext *pb = &s->pb;
|
|
FLVContext *flv = s->priv_data;
|
|
|
|
file_size = url_ftell(pb);
|
|
|
|
/* update informations */
|
|
url_fseek(pb, flv->duration_offset, SEEK_SET);
|
|
put_amf_double(pb, flv->duration / (double)1000);
|
|
url_fseek(pb, flv->filesize_offset, SEEK_SET);
|
|
put_amf_double(pb, file_size);
|
|
|
|
url_fseek(pb, file_size, SEEK_SET);
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
int size= pkt->size;
|
|
int flags;
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
|
|
|
|
if (enc->codec_type == CODEC_TYPE_VIDEO) {
|
|
put_byte(pb, FLV_TAG_TYPE_VIDEO);
|
|
|
|
flags = enc->codec_tag;
|
|
if(flags == 0) {
|
|
av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
|
|
return -1;
|
|
}
|
|
|
|
flags |= pkt->flags & PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
|
|
} else {
|
|
assert(enc->codec_type == CODEC_TYPE_AUDIO);
|
|
flags = get_audio_flags(enc);
|
|
|
|
assert(size);
|
|
|
|
put_byte(pb, FLV_TAG_TYPE_AUDIO);
|
|
}
|
|
|
|
if ((enc->codec_id == CODEC_ID_VP6) || (enc->codec_id == CODEC_ID_VP6F))
|
|
put_be24(pb,size+2); // include the extra byte needed for VP6 in flv and flags
|
|
else
|
|
put_be24(pb,size+1); // include flags
|
|
put_be24(pb,pkt->pts);
|
|
put_be32(pb,flv->reserved);
|
|
put_byte(pb,flags);
|
|
if (enc->codec_id == CODEC_ID_VP6)
|
|
put_byte(pb,0);
|
|
if (enc->codec_id == CODEC_ID_VP6F)
|
|
put_byte(pb, enc->extradata_size ? enc->extradata[0] : 0);
|
|
put_buffer(pb, pkt->data, size);
|
|
put_be32(pb,size+1+11); // previous tag size
|
|
flv->duration = pkt->pts + pkt->duration;
|
|
|
|
put_flush_packet(pb);
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat flv_muxer = {
|
|
"flv",
|
|
"flv format",
|
|
"video/x-flv",
|
|
"flv",
|
|
sizeof(FLVContext),
|
|
#ifdef CONFIG_LIBMP3LAME
|
|
CODEC_ID_MP3,
|
|
#else // CONFIG_LIBMP3LAME
|
|
CODEC_ID_NONE,
|
|
#endif // CONFIG_LIBMP3LAME
|
|
CODEC_ID_FLV1,
|
|
flv_write_header,
|
|
flv_write_packet,
|
|
flv_write_trailer,
|
|
.codec_tag= (const AVCodecTag*[]){flv_video_codec_ids, flv_audio_codec_ids, 0},
|
|
};
|