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 amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
44 int length = get_be16(ioc);
45 if(length >= buffsize) {
46 url_fskip(ioc, length);
50 get_buffer(ioc, buffer, length);
52 buffer[length] = '\0';
57 static int flv_read_header(AVFormatContext *s,
58 AVFormatParameters *ap)
64 flags = get_byte(&s->pb);
66 if(flags & FLV_HEADER_FLAG_HASVIDEO){
67 st = av_new_stream(s, 0);
70 st->codec->codec_type = CODEC_TYPE_VIDEO;
71 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
73 if(flags & FLV_HEADER_FLAG_HASAUDIO){
74 st = av_new_stream(s, 1);
77 st->codec->codec_type = CODEC_TYPE_AUDIO;
78 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
81 offset = get_be32(&s->pb);
82 url_fseek(&s->pb, offset, SEEK_SET);
89 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
91 int ret, i, type, size, pts, flags, is_audio, next, pos;
95 pos = url_ftell(&s->pb);
96 url_fskip(&s->pb, 4); /* size of previous packet */
97 type = get_byte(&s->pb);
98 size = get_be24(&s->pb);
99 pts = get_be24(&s->pb);
100 // av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
101 if (url_feof(&s->pb))
103 url_fskip(&s->pb, 4); /* reserved */
109 next= size + url_ftell(&s->pb);
111 if (type == FLV_TAG_TYPE_AUDIO) {
113 flags = get_byte(&s->pb);
114 } else if (type == FLV_TAG_TYPE_VIDEO) {
116 flags = get_byte(&s->pb);
117 } else if (type == FLV_TAG_TYPE_META && size > 13+1+4) {
118 url_fskip(&s->pb, 13); //onMetaData blah
119 if(get_byte(&s->pb) == 8){
120 url_fskip(&s->pb, 4);
122 while(url_ftell(&s->pb) + 5 < next){
127 if(amf_get_string(&s->pb, tmp, sizeof(tmp))<0)
130 type= get_byte(&s->pb);
131 if(type == AMF_DATA_TYPE_NUMBER){
132 d= av_int2dbl(get_be64(&s->pb));
133 }else if(type == AMF_DATA_TYPE_STRING){
134 amf_get_string(&s->pb, NULL, 0);
135 }else if(type == AMF_DATA_TYPE_MIXEDARRAY){
138 }else if(type == AMF_DATA_TYPE_DATE){
139 d= av_int2dbl(get_be64(&s->pb));
143 if(!strcmp(tmp, "duration")){
144 s->duration = d*AV_TIME_BASE;
145 }else if(!strcmp(tmp, "videodatarate")){
146 }else if(!strcmp(tmp, "audiodatarate")){
149 url_fseek(&s->pb, next, SEEK_SET);
153 av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
154 url_fseek(&s->pb, next, SEEK_SET);
158 /* now find stream */
159 for(i=0;i<s->nb_streams;i++) {
161 if (st->id == is_audio)
164 if(i == s->nb_streams){
165 av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
166 url_fseek(&s->pb, next, SEEK_SET);
169 // av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
170 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
171 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
172 || st->discard >= AVDISCARD_ALL
174 url_fseek(&s->pb, next, SEEK_SET);
177 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
178 av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
182 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
183 if(!url_is_streamed(&s->pb) && s->duration==AV_NOPTS_VALUE){
185 const int pos= url_ftell(&s->pb);
186 const int fsize= url_fsize(&s->pb);
187 url_fseek(&s->pb, fsize-4, SEEK_SET);
188 size= get_be32(&s->pb);
189 url_fseek(&s->pb, fsize-3-size, SEEK_SET);
190 if(size == get_be24(&s->pb) + 11){
191 s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
193 url_fseek(&s->pb, pos, SEEK_SET);
197 if(st->codec->sample_rate == 0){
198 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
199 if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
200 st->codec->sample_rate= 8000;
202 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
203 switch(flags & FLV_AUDIO_CODECID_MASK) {
204 case FLV_CODECID_PCM_BE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16BE;
205 else st->codec->codec_id = CODEC_ID_PCM_S8; break;
206 case FLV_CODECID_ADPCM : st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
207 case FLV_CODECID_MP3 : st->codec->codec_id = CODEC_ID_MP3 ; st->need_parsing = 1; break;
208 // this is not listed at FLV but at SWF, strange...
209 case FLV_CODECID_PCM_LE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16LE;
210 else st->codec->codec_id = CODEC_ID_PCM_S8; break;
212 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
213 st->codec->codec_tag= (flags >> 4);
215 st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
218 switch(flags & FLV_VIDEO_CODECID_MASK){
219 case FLV_CODECID_H263 : st->codec->codec_id = CODEC_ID_FLV1 ; break;
220 case FLV_CODECID_SCREEN: st->codec->codec_id = CODEC_ID_FLASHSV; break;
221 case FLV_CODECID_VP6 :
222 st->codec->codec_id = CODEC_ID_VP6F;
223 if (st->codec->extradata_size != 1) {
224 st->codec->extradata_size = 1;
225 st->codec->extradata = av_malloc(1);
227 /* width and height adjustment */
228 st->codec->extradata[0] = get_byte(&s->pb);
232 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & FLV_VIDEO_CODECID_MASK);
233 st->codec->codec_tag = flags & FLV_VIDEO_CODECID_MASK;
237 ret= av_get_packet(&s->pb, pkt, size - 1);
241 /* note: we need to modify the packet size here to handle the last
245 pkt->stream_index = st->index;
247 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
248 pkt->flags |= PKT_FLAG_KEY;
253 static int flv_read_close(AVFormatContext *s)
258 static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
260 AVStream *st = s->streams[stream_index];
261 int index = av_index_search_timestamp(st, timestamp, flags);
264 url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
269 AVInputFormat flv_demuxer = {
279 .value = CODEC_ID_FLV1,