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' && d[3] < 5 && d[5]==0) {
38 return AVPROBE_SCORE_MAX;
43 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
44 AVCodecContext *acodec = astream->codec;
46 //no distinction between S16 and S8 PCM codec flags
47 case FLV_CODECID_PCM_BE:
48 acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16BE; break;
49 case FLV_CODECID_PCM_LE:
50 acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
51 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
52 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = 1 ; break;
53 case FLV_CODECID_NELLYMOSER_8HZ_MONO:
54 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
55 case FLV_CODECID_NELLYMOSER:
57 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
58 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
62 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
63 AVCodecContext *vcodec = vstream->codec;
65 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
66 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
67 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
68 if(vcodec->extradata_size != 1) {
69 vcodec->extradata_size = 1;
70 vcodec->extradata = av_malloc(1);
72 vcodec->extradata[0] = get_byte(&s->pb);
73 return 1; // 1 byte body size adjustment for flv_read_packet()
75 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
76 vcodec->codec_tag = flv_codecid;
82 static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
83 int length = get_be16(ioc);
84 if(length >= buffsize) {
85 url_fskip(ioc, length);
89 get_buffer(ioc, buffer, length);
91 buffer[length] = '\0';
96 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, unsigned int max_pos, int depth) {
97 AVCodecContext *acodec, *vcodec;
106 amf_type = get_byte(ioc);
109 case AMF_DATA_TYPE_NUMBER:
110 num_val = av_int2dbl(get_be64(ioc)); break;
111 case AMF_DATA_TYPE_BOOL:
112 num_val = get_byte(ioc); break;
113 case AMF_DATA_TYPE_STRING:
114 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
117 case AMF_DATA_TYPE_OBJECT: {
120 while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
121 url_fskip(ioc, keylen); //skip key string
122 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
123 return -1; //if we couldn't skip, bomb out.
125 if(get_byte(ioc) != AMF_END_OF_OBJECT)
129 case AMF_DATA_TYPE_NULL:
130 case AMF_DATA_TYPE_UNDEFINED:
131 case AMF_DATA_TYPE_UNSUPPORTED:
132 break; //these take up no additional space
133 case AMF_DATA_TYPE_MIXEDARRAY:
134 url_fskip(ioc, 4); //skip 32-bit max array index
135 while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
136 //this is the only case in which we would want a nested parse to not skip over the object
137 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
140 if(get_byte(ioc) != AMF_END_OF_OBJECT)
143 case AMF_DATA_TYPE_ARRAY: {
144 unsigned int arraylen, i;
146 arraylen = get_be32(ioc);
147 for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
148 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
149 return -1; //if we couldn't skip, bomb out.
153 case AMF_DATA_TYPE_DATE:
154 url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
156 default: //unsupported type, we couldn't skip
160 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
161 acodec = astream ? astream->codec : NULL;
162 vcodec = vstream ? vstream->codec : NULL;
164 if(amf_type == AMF_DATA_TYPE_BOOL) {
165 if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1;
166 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
167 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
168 // else if(!strcmp(key, "width") && vcodec && num_val > 0) vcodec->width = num_val;
169 // else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val;
170 else if(!strcmp(key, "audiocodecid") && acodec) flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
171 else if(!strcmp(key, "videocodecid") && vcodec) flv_set_video_codec(s, vstream, (int)num_val);
172 else if(!strcmp(key, "audiosamplesize") && acodec && num_val >= 0) {
173 acodec->bits_per_sample = num_val;
174 //we may have to rewrite a previously read codecid because FLV only marks PCM endianness.
175 if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE))
176 acodec->codec_id = CODEC_ID_PCM_S8;
178 else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) {
179 //some tools, like FLVTool2, write consistently approximate metadata sample rates
180 switch((int)num_val) {
181 case 44000: acodec->sample_rate = 44100 ; break;
182 case 22000: acodec->sample_rate = 22050 ; break;
183 case 11000: acodec->sample_rate = 11025 ; break;
184 case 5000 : acodec->sample_rate = 5512 ; break;
185 default : acodec->sample_rate = num_val;
194 static int flv_read_metabody(AVFormatContext *s, unsigned int next_pos) {
196 AVStream *stream, *astream, *vstream;
199 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
206 //first object needs to be "onMetaData" string
207 type = get_byte(ioc);
208 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
211 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
212 for(i = 0; i < s->nb_streams; i++) {
213 stream = s->streams[i];
214 if (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
215 else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
218 //parse the second object (we want a mixed array)
219 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
225 static int flv_read_header(AVFormatContext *s,
226 AVFormatParameters *ap)
231 url_fskip(&s->pb, 4);
232 flags = get_byte(&s->pb);
233 /* old flvtool cleared this field */
234 /* FIXME: better fix needed */
236 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
237 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
240 if(flags & FLV_HEADER_FLAG_HASVIDEO){
241 st = av_new_stream(s, 0);
243 return AVERROR_NOMEM;
244 st->codec->codec_type = CODEC_TYPE_VIDEO;
245 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
247 if(flags & FLV_HEADER_FLAG_HASAUDIO){
248 st = av_new_stream(s, 1);
250 return AVERROR_NOMEM;
251 st->codec->codec_type = CODEC_TYPE_AUDIO;
252 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
255 offset = get_be32(&s->pb);
256 url_fseek(&s->pb, offset, SEEK_SET);
263 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
265 int ret, i, type, size, pts, flags, is_audio, next, pos;
269 pos = url_ftell(&s->pb);
270 url_fskip(&s->pb, 4); /* size of previous packet */
271 type = get_byte(&s->pb);
272 size = get_be24(&s->pb);
273 pts = get_be24(&s->pb);
274 // av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
275 if (url_feof(&s->pb))
277 url_fskip(&s->pb, 4); /* reserved */
283 next= size + url_ftell(&s->pb);
285 if (type == FLV_TAG_TYPE_AUDIO) {
287 flags = get_byte(&s->pb);
288 } else if (type == FLV_TAG_TYPE_VIDEO) {
290 flags = get_byte(&s->pb);
292 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
293 flv_read_metabody(s, next);
294 else /* skip packet */
295 av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
296 url_fseek(&s->pb, next, SEEK_SET);
300 /* now find stream */
301 for(i=0;i<s->nb_streams;i++) {
303 if (st->id == is_audio)
306 if(i == s->nb_streams){
307 av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
308 url_fseek(&s->pb, next, SEEK_SET);
311 // av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
312 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
313 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
314 || st->discard >= AVDISCARD_ALL
316 url_fseek(&s->pb, next, SEEK_SET);
319 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
320 av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
324 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
325 if(!url_is_streamed(&s->pb) && s->duration==AV_NOPTS_VALUE){
327 const int pos= url_ftell(&s->pb);
328 const int fsize= url_fsize(&s->pb);
329 url_fseek(&s->pb, fsize-4, SEEK_SET);
330 size= get_be32(&s->pb);
331 url_fseek(&s->pb, fsize-3-size, SEEK_SET);
332 if(size == get_be24(&s->pb) + 11){
333 s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
335 url_fseek(&s->pb, pos, SEEK_SET);
339 if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
340 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
341 if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
342 st->codec->sample_rate= 8000;
344 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
345 st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
346 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
349 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
352 ret= av_get_packet(&s->pb, pkt, size - 1);
356 /* note: we need to modify the packet size here to handle the last
360 pkt->stream_index = st->index;
362 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
363 pkt->flags |= PKT_FLAG_KEY;
368 static int flv_read_close(AVFormatContext *s)
373 static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
375 AVStream *st = s->streams[stream_index];
376 int index = av_index_search_timestamp(st, timestamp, flags);
379 url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
384 AVInputFormat flv_demuxer = {
394 .value = CODEC_ID_FLV1,