mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-22 09:15:06 +02:00
230 lines
6.8 KiB
C
230 lines
6.8 KiB
C
/*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "avformat.h"
|
|
|
|
static int flv_probe(AVProbeData *p)
|
|
{
|
|
const uint8_t *d;
|
|
|
|
if (p->buf_size < 6)
|
|
return 0;
|
|
d = p->buf;
|
|
if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
|
|
return 50;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int flv_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
int offset, flags, size;
|
|
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ...
|
|
|
|
url_fskip(&s->pb, 4);
|
|
flags = get_byte(&s->pb);
|
|
|
|
offset = get_be32(&s->pb);
|
|
|
|
if(!url_is_streamed(&s->pb)){
|
|
const int fsize= url_fsize(&s->pb);
|
|
url_fseek(&s->pb, fsize-4, SEEK_SET);
|
|
size= get_be32(&s->pb);
|
|
url_fseek(&s->pb, fsize-3-size, SEEK_SET);
|
|
if(size == get_be24(&s->pb) + 11){
|
|
s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
|
|
}
|
|
}
|
|
|
|
url_fseek(&s->pb, offset, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret, i, type, size, pts, flags, is_audio, next;
|
|
AVStream *st = NULL;
|
|
|
|
for(;;){
|
|
url_fskip(&s->pb, 4); /* size of previous packet */
|
|
type = get_byte(&s->pb);
|
|
size = get_be24(&s->pb);
|
|
pts = get_be24(&s->pb);
|
|
// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
|
|
if (url_feof(&s->pb))
|
|
return AVERROR_IO;
|
|
url_fskip(&s->pb, 4); /* reserved */
|
|
flags = 0;
|
|
|
|
if(size == 0)
|
|
continue;
|
|
|
|
next= size + url_ftell(&s->pb);
|
|
|
|
if (type == 8) {
|
|
is_audio=1;
|
|
flags = get_byte(&s->pb);
|
|
} else if (type == 9) {
|
|
is_audio=0;
|
|
flags = get_byte(&s->pb);
|
|
} else if (type == 18 && size > 13+1+4) {
|
|
url_fskip(&s->pb, 13); //onMetaData blah
|
|
if(get_byte(&s->pb) == 8){
|
|
url_fskip(&s->pb, 4);
|
|
}
|
|
while(url_ftell(&s->pb) + 5 < next){
|
|
char tmp[128];
|
|
int type, len;
|
|
double d= 0;
|
|
|
|
len= get_be16(&s->pb);
|
|
if(len >= sizeof(tmp) || !len)
|
|
break;
|
|
get_buffer(&s->pb, tmp, len);
|
|
tmp[len]=0;
|
|
|
|
type= get_byte(&s->pb);
|
|
if(type==0){
|
|
d= av_int2dbl(get_be64(&s->pb));
|
|
}else if(type==2){
|
|
len= get_be16(&s->pb);
|
|
if(len >= sizeof(tmp))
|
|
break;
|
|
url_fskip(&s->pb, len);
|
|
}else if(type==8){
|
|
//array
|
|
break;
|
|
}else if(type==11){
|
|
d= av_int2dbl(get_be64(&s->pb));
|
|
get_be16(&s->pb);
|
|
}
|
|
|
|
if(!strcmp(tmp, "duration")){
|
|
s->duration = d*AV_TIME_BASE;
|
|
}else if(!strcmp(tmp, "videodatarate")){
|
|
}else if(!strcmp(tmp, "audiodatarate")){
|
|
}
|
|
}
|
|
url_fseek(&s->pb, next, SEEK_SET);
|
|
continue;
|
|
} else {
|
|
/* skip packet */
|
|
av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
|
|
url_fseek(&s->pb, next, SEEK_SET);
|
|
continue;
|
|
}
|
|
|
|
/* now find stream */
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
st = s->streams[i];
|
|
if (st->id == is_audio)
|
|
break;
|
|
}
|
|
if(i == s->nb_streams){
|
|
st = av_new_stream(s, is_audio);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
|
|
av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
|
|
st->codec->time_base= (AVRational){1,1000};
|
|
}
|
|
// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
|
|
if( (st->discard >= AVDISCARD_NONKEY && !((flags >> 4)==1 || is_audio))
|
|
||(st->discard >= AVDISCARD_BIDIR && ((flags >> 4)==3 && !is_audio))
|
|
|| st->discard >= AVDISCARD_ALL
|
|
){
|
|
url_fseek(&s->pb, next, SEEK_SET);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if(is_audio){
|
|
if(st->codec->sample_rate == 0){
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec->channels = (flags&1)+1;
|
|
if((flags >> 4) == 5)
|
|
st->codec->sample_rate= 8000;
|
|
else
|
|
st->codec->sample_rate = (44100<<((flags>>2)&3))>>3;
|
|
switch(flags >> 4){/* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
|
|
case 0: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16BE;
|
|
else st->codec->codec_id = CODEC_ID_PCM_S8; break;
|
|
case 1: st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
|
|
case 2: st->codec->codec_id = CODEC_ID_MP3; break;
|
|
// this is not listed at FLV but at SWF, strange...
|
|
case 3: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16LE;
|
|
else st->codec->codec_id = CODEC_ID_PCM_S8; break;
|
|
default:
|
|
av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
|
|
st->codec->codec_tag= (flags >> 4);
|
|
}
|
|
st->codec->bits_per_sample = (flags & 2) ? 16 : 8;
|
|
}
|
|
}else{
|
|
st->codec->codec_type = CODEC_TYPE_VIDEO;
|
|
switch(flags & 0xF){
|
|
case 2: st->codec->codec_id = CODEC_ID_FLV1; break;
|
|
default:
|
|
av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & 0xf);
|
|
st->codec->codec_tag= flags & 0xF;
|
|
}
|
|
}
|
|
|
|
ret= av_get_packet(&s->pb, pkt, size - 1);
|
|
if (ret <= 0) {
|
|
return AVERROR_IO;
|
|
}
|
|
/* note: we need to modify the packet size here to handle the last
|
|
packet */
|
|
pkt->size = ret;
|
|
pkt->pts = pts;
|
|
pkt->stream_index = st->index;
|
|
|
|
if (is_audio || ((flags >> 4)==1))
|
|
pkt->flags |= PKT_FLAG_KEY;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int flv_read_close(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat flv_iformat = {
|
|
"flv",
|
|
"flv format",
|
|
0,
|
|
flv_probe,
|
|
flv_read_header,
|
|
flv_read_packet,
|
|
flv_read_close,
|
|
.extensions = "flv",
|
|
.value = CODEC_ID_FLV1,
|
|
};
|
|
|
|
int flvdec_init(void)
|
|
{
|
|
av_register_input_format(&flv_iformat);
|
|
return 0;
|
|
}
|