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
30 static int flv_probe(AVProbeData *p)
37 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
43 static int flv_read_header(AVFormatContext *s,
44 AVFormatParameters *ap)
46 int offset, flags, size;
48 s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ...
51 flags = get_byte(&s->pb);
53 offset = get_be32(&s->pb);
55 if(!url_is_streamed(&s->pb)){
56 const int fsize= url_fsize(&s->pb);
57 url_fseek(&s->pb, fsize-4, SEEK_SET);
58 size= get_be32(&s->pb);
59 url_fseek(&s->pb, fsize-3-size, SEEK_SET);
60 if(size == get_be24(&s->pb) + 11){
61 s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
65 url_fseek(&s->pb, offset, SEEK_SET);
72 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
74 int ret, i, type, size, pts, flags, is_audio, next, pos;
78 pos = url_ftell(&s->pb);
79 url_fskip(&s->pb, 4); /* size of previous packet */
80 type = get_byte(&s->pb);
81 size = get_be24(&s->pb);
82 pts = get_be24(&s->pb);
83 // av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
86 url_fskip(&s->pb, 4); /* reserved */
92 next= size + url_ftell(&s->pb);
94 if (type == FLV_TAG_TYPE_AUDIO) {
96 flags = get_byte(&s->pb);
97 } else if (type == FLV_TAG_TYPE_VIDEO) {
99 flags = get_byte(&s->pb);
100 } else if (type == FLV_TAG_TYPE_META && size > 13+1+4) {
101 url_fskip(&s->pb, 13); //onMetaData blah
102 if(get_byte(&s->pb) == 8){
103 url_fskip(&s->pb, 4);
105 while(url_ftell(&s->pb) + 5 < next){
110 len= get_be16(&s->pb);
111 if(len >= sizeof(tmp) || !len)
113 get_buffer(&s->pb, tmp, len);
116 type= get_byte(&s->pb);
117 if(type == AMF_DATA_TYPE_NUMBER){
118 d= av_int2dbl(get_be64(&s->pb));
119 }else if(type == AMF_DATA_TYPE_STRING){
120 len= get_be16(&s->pb);
121 if(len >= sizeof(tmp))
123 url_fskip(&s->pb, len);
124 }else if(type == AMF_DATA_TYPE_MIXEDARRAY){
127 }else if(type == AMF_DATA_TYPE_DATE){
128 d= av_int2dbl(get_be64(&s->pb));
132 if(!strcmp(tmp, "duration")){
133 s->duration = d*AV_TIME_BASE;
134 }else if(!strcmp(tmp, "videodatarate")){
135 }else if(!strcmp(tmp, "audiodatarate")){
138 url_fseek(&s->pb, next, SEEK_SET);
142 av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
143 url_fseek(&s->pb, next, SEEK_SET);
147 /* now find stream */
148 for(i=0;i<s->nb_streams;i++) {
150 if (st->id == is_audio)
153 if(i == s->nb_streams){
154 st = av_new_stream(s, is_audio);
156 return AVERROR_NOMEM;
158 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
159 st->codec->time_base= (AVRational){1,1000};
161 // av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
162 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
163 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
164 || st->discard >= AVDISCARD_ALL
166 url_fseek(&s->pb, next, SEEK_SET);
169 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
170 av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
175 if(st->codec->sample_rate == 0){
176 st->codec->codec_type = CODEC_TYPE_AUDIO;
177 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
178 if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
179 st->codec->sample_rate= 8000;
181 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
182 switch(flags & FLV_AUDIO_CODECID_MASK) {
183 case FLV_CODECID_PCM_BE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16BE;
184 else st->codec->codec_id = CODEC_ID_PCM_S8; break;
185 case FLV_CODECID_ADPCM : st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
186 case FLV_CODECID_MP3 : st->codec->codec_id = CODEC_ID_MP3 ; st->need_parsing = 1; break;
187 // this is not listed at FLV but at SWF, strange...
188 case FLV_CODECID_PCM_LE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16LE;
189 else st->codec->codec_id = CODEC_ID_PCM_S8; break;
191 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
192 st->codec->codec_tag= (flags >> 4);
194 st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
197 st->codec->codec_type = CODEC_TYPE_VIDEO;
198 switch(flags & FLV_VIDEO_CODECID_MASK){
199 case FLV_CODECID_H263 : st->codec->codec_id = CODEC_ID_FLV1 ; break;
200 case FLV_CODECID_SCREEN: st->codec->codec_id = CODEC_ID_FLASHSV; break;
201 case FLV_CODECID_VP6 :
202 st->codec->codec_id = CODEC_ID_VP6F;
203 if (st->codec->extradata_size != 1) {
204 st->codec->extradata_size = 1;
205 st->codec->extradata = av_malloc(1);
207 /* width and height adjustment */
208 st->codec->extradata[0] = get_byte(&s->pb);
212 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & FLV_VIDEO_CODECID_MASK);
213 st->codec->codec_tag = flags & FLV_VIDEO_CODECID_MASK;
217 ret= av_get_packet(&s->pb, pkt, size - 1);
221 /* note: we need to modify the packet size here to handle the last
225 pkt->stream_index = st->index;
227 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
228 pkt->flags |= PKT_FLAG_KEY;
233 static int flv_read_close(AVFormatContext *s)
238 static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
240 AVStream *st = s->streams[stream_index];
241 int index = av_index_search_timestamp(st, timestamp, flags);
244 url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
249 AVInputFormat flv_demuxer = {
259 .value = CODEC_ID_FLV1,