3 * Copyright (c) 2003 The FFmpeg Project.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * This demuxer will generate a 1 byte extradata for VP6F content.
24 * - upper 4bits: difference between encoded width and visible width
25 * - lower 4bits: difference between encoded height and visible height
29 static int flv_probe(AVProbeData *p)
36 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
42 static int flv_read_header(AVFormatContext *s,
43 AVFormatParameters *ap)
45 int offset, flags, size;
47 s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ...
50 flags = get_byte(&s->pb);
52 offset = get_be32(&s->pb);
54 if(!url_is_streamed(&s->pb)){
55 const int fsize= url_fsize(&s->pb);
56 url_fseek(&s->pb, fsize-4, SEEK_SET);
57 size= get_be32(&s->pb);
58 url_fseek(&s->pb, fsize-3-size, SEEK_SET);
59 if(size == get_be24(&s->pb) + 11){
60 s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
64 url_fseek(&s->pb, offset, SEEK_SET);
71 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
73 int ret, i, type, size, pts, flags, is_audio, next, pos;
77 pos = url_ftell(&s->pb);
78 url_fskip(&s->pb, 4); /* size of previous packet */
79 type = get_byte(&s->pb);
80 size = get_be24(&s->pb);
81 pts = get_be24(&s->pb);
82 // av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
85 url_fskip(&s->pb, 4); /* reserved */
91 next= size + url_ftell(&s->pb);
95 flags = get_byte(&s->pb);
96 } else if (type == 9) {
98 flags = get_byte(&s->pb);
99 } else if (type == 18 && size > 13+1+4) {
100 url_fskip(&s->pb, 13); //onMetaData blah
101 if(get_byte(&s->pb) == 8){
102 url_fskip(&s->pb, 4);
104 while(url_ftell(&s->pb) + 5 < next){
109 len= get_be16(&s->pb);
110 if(len >= sizeof(tmp) || !len)
112 get_buffer(&s->pb, tmp, len);
115 type= get_byte(&s->pb);
117 d= av_int2dbl(get_be64(&s->pb));
119 len= get_be16(&s->pb);
120 if(len >= sizeof(tmp))
122 url_fskip(&s->pb, len);
127 d= av_int2dbl(get_be64(&s->pb));
131 if(!strcmp(tmp, "duration")){
132 s->duration = d*AV_TIME_BASE;
133 }else if(!strcmp(tmp, "videodatarate")){
134 }else if(!strcmp(tmp, "audiodatarate")){
137 url_fseek(&s->pb, next, SEEK_SET);
141 av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
142 url_fseek(&s->pb, next, SEEK_SET);
146 /* now find stream */
147 for(i=0;i<s->nb_streams;i++) {
149 if (st->id == is_audio)
152 if(i == s->nb_streams){
153 st = av_new_stream(s, is_audio);
155 return AVERROR_NOMEM;
157 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
158 st->codec->time_base= (AVRational){1,1000};
160 // av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
161 if( (st->discard >= AVDISCARD_NONKEY && !((flags >> 4)==1 || is_audio))
162 ||(st->discard >= AVDISCARD_BIDIR && ((flags >> 4)==3 && !is_audio))
163 || st->discard >= AVDISCARD_ALL
165 url_fseek(&s->pb, next, SEEK_SET);
169 av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
174 if(st->codec->sample_rate == 0){
175 st->codec->codec_type = CODEC_TYPE_AUDIO;
176 st->codec->channels = (flags&1)+1;
177 if((flags >> 4) == 5)
178 st->codec->sample_rate= 8000;
180 st->codec->sample_rate = (44100<<((flags>>2)&3))>>3;
181 switch(flags >> 4){/* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
182 case 0: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16BE;
183 else st->codec->codec_id = CODEC_ID_PCM_S8; break;
184 case 1: st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
185 case 2: st->codec->codec_id = CODEC_ID_MP3; st->need_parsing = 1; break;
186 // this is not listed at FLV but at SWF, strange...
187 case 3: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16LE;
188 else st->codec->codec_id = CODEC_ID_PCM_S8; break;
190 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
191 st->codec->codec_tag= (flags >> 4);
193 st->codec->bits_per_sample = (flags & 2) ? 16 : 8;
196 st->codec->codec_type = CODEC_TYPE_VIDEO;
198 case 2: st->codec->codec_id = CODEC_ID_FLV1; break;
199 case 3: st->codec->codec_id = CODEC_ID_FLASHSV; break;
201 st->codec->codec_id = CODEC_ID_VP6F;
202 if (st->codec->extradata_size != 1) {
203 st->codec->extradata_size = 1;
204 st->codec->extradata = av_malloc(1);
206 /* width and height adjustment */
207 st->codec->extradata[0] = get_byte(&s->pb);
211 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & 0xf);
212 st->codec->codec_tag= flags & 0xF;
216 ret= av_get_packet(&s->pb, pkt, size - 1);
220 /* note: we need to modify the packet size here to handle the last
224 pkt->stream_index = st->index;
226 if (is_audio || ((flags >> 4)==1))
227 pkt->flags |= PKT_FLAG_KEY;
232 static int flv_read_close(AVFormatContext *s)
237 static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
239 AVStream *st = s->streams[stream_index];
240 int index = av_index_search_timestamp(st, timestamp, flags);
243 url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
248 AVInputFormat flv_demuxer = {
258 .value = CODEC_ID_FLV1,