ffmpeg/libavformat/flvenc.c

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/*
* 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 >> 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_NELLYMOSER, FLV_CODECID_NELLYMOSER >> 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
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_S8:
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:
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(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], 32, 1, 1000); /* 32 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, flags_size;
// 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)
flags_size= 2;
else
flags_size= 1;
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);
}
put_be24(pb,size + flags_size);
put_be24(pb,pkt->pts);
put_byte(pb,pkt->pts >> 24);
put_be24(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+flags_size+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_ADPCM_SWF,
#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},
};