219 lines
6.4 KiB
C
219 lines
6.4 KiB
C
/*
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* FLV encoder.
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* Copyright (c) 2003 The FFmpeg Project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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static int flv_probe(AVProbeData *p)
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{
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const uint8_t *d;
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if (p->buf_size < 6)
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return 0;
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d = p->buf;
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if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
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return 50;
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}
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return 0;
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}
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static int flv_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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int offset, flags;
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s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ...
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url_fskip(&s->pb, 4);
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flags = get_byte(&s->pb);
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offset = get_be32(&s->pb);
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url_fseek(&s->pb, offset, SEEK_SET);
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return 0;
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}
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static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, i, type, size, pts, flags, is_audio, next;
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AVStream *st = NULL;
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for(;;){
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url_fskip(&s->pb, 4); /* size of previous packet */
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type = get_byte(&s->pb);
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size = get_be24(&s->pb);
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pts = get_be24(&s->pb);
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// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
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if (url_feof(&s->pb))
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return AVERROR_IO;
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url_fskip(&s->pb, 4); /* reserved */
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flags = 0;
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if(size == 0)
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continue;
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next= size + url_ftell(&s->pb);
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if (type == 8) {
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is_audio=1;
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flags = get_byte(&s->pb);
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} else if (type == 9) {
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is_audio=0;
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flags = get_byte(&s->pb);
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} else if (type == 18 && size > 13+1+4) {
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url_fskip(&s->pb, 13); //onMetaData blah
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if(get_byte(&s->pb) == 8){
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url_fskip(&s->pb, 4);
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}
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while(url_ftell(&s->pb) + 5 < next){
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char tmp[128];
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int type, len;
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double d= 0;
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len= get_be16(&s->pb);
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if(len >= sizeof(tmp) || !len)
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break;
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get_buffer(&s->pb, tmp, len);
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tmp[len]=0;
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type= get_byte(&s->pb);
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if(type==0){
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d= av_int2dbl(get_be64(&s->pb));
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}else if(type==2){
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len= get_be16(&s->pb);
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if(len >= sizeof(tmp))
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break;
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url_fskip(&s->pb, len);
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}else if(type==8){
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//array
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break;
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}else if(type==11){
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d= av_int2dbl(get_be64(&s->pb));
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get_be16(&s->pb);
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}
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if(!strcmp(tmp, "duration")){
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s->duration = d*AV_TIME_BASE;
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}else if(!strcmp(tmp, "videodatarate")){
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}else if(!strcmp(tmp, "audiodatarate")){
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}
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}
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url_fseek(&s->pb, next, SEEK_SET);
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continue;
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} else {
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/* skip packet */
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av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
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url_fseek(&s->pb, next, SEEK_SET);
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continue;
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}
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/* now find stream */
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for(i=0;i<s->nb_streams;i++) {
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st = s->streams[i];
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if (st->id == is_audio)
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break;
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}
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if(i == s->nb_streams){
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st = av_new_stream(s, is_audio);
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if (!st)
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return AVERROR_NOMEM;
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av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
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st->codec->time_base= (AVRational){1,1000};
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}
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// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
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if( (st->discard >= AVDISCARD_NONKEY && !((flags >> 4)==1 || is_audio))
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||(st->discard >= AVDISCARD_BIDIR && ((flags >> 4)==3 && !is_audio))
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|| st->discard >= AVDISCARD_ALL
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){
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url_fseek(&s->pb, next, SEEK_SET);
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continue;
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}
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break;
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}
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if(is_audio){
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if(st->codec->sample_rate == 0){
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->channels = (flags&1)+1;
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if((flags >> 4) == 5)
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st->codec->sample_rate= 8000;
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else
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st->codec->sample_rate = (44100<<((flags>>2)&3))>>3;
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switch(flags >> 4){/* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
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case 0: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16BE;
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else st->codec->codec_id = CODEC_ID_PCM_S8; break;
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case 1: st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
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case 2: st->codec->codec_id = CODEC_ID_MP3; break;
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// this is not listed at FLV but at SWF, strange...
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case 3: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16LE;
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else st->codec->codec_id = CODEC_ID_PCM_S8; break;
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default:
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av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
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st->codec->codec_tag= (flags >> 4);
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}
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st->codec->bits_per_sample = (flags & 2) ? 16 : 8;
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}
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}else{
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st->codec->codec_type = CODEC_TYPE_VIDEO;
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switch(flags & 0xF){
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case 2: st->codec->codec_id = CODEC_ID_FLV1; break;
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default:
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av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & 0xf);
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st->codec->codec_tag= flags & 0xF;
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}
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}
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ret= av_get_packet(&s->pb, pkt, size - 1);
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if (ret <= 0) {
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return AVERROR_IO;
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}
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/* note: we need to modify the packet size here to handle the last
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packet */
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pkt->size = ret;
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pkt->pts = pts;
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pkt->stream_index = st->index;
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if (is_audio || ((flags >> 4)==1))
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pkt->flags |= PKT_FLAG_KEY;
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return ret;
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}
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static int flv_read_close(AVFormatContext *s)
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{
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return 0;
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}
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AVInputFormat flv_iformat = {
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"flv",
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"flv format",
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0,
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flv_probe,
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flv_read_header,
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flv_read_packet,
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flv_read_close,
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.extensions = "flv",
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.value = CODEC_ID_FLV1,
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};
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int flvdec_init(void)
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{
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av_register_input_format(&flv_iformat);
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return 0;
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}
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