3 * Copyright (c) 2003 The FFmpeg Project
5 * This demuxer will generate a 1 byte extradata for VP6F content.
7 * - upper 4bits: difference between encoded width and visible width
8 * - lower 4bits: difference between encoded height and visible height
10 * This file is part of FFmpeg.
12 * FFmpeg is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
17 * FFmpeg is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with FFmpeg; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavutil/avstring.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/intfloat_readwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/mpeg4audio.h"
35 #include "avio_internal.h"
39 int wrong_dts; ///< wrong dts due to negative cts
42 static int flv_probe(AVProbeData *p)
47 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
48 return AVPROBE_SCORE_MAX;
53 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
54 AVCodecContext *acodec = astream->codec;
56 //no distinction between S16 and S8 PCM codec flags
58 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
65 case FLV_CODECID_PCM_LE:
66 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
67 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
68 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
69 case FLV_CODECID_SPEEX:
70 acodec->codec_id = CODEC_ID_SPEEX;
71 acodec->sample_rate = 16000;
73 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
74 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
75 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
76 acodec->codec_id = CODEC_ID_NELLYMOSER;
78 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
79 acodec->sample_rate = 16000;
80 acodec->codec_id = CODEC_ID_NELLYMOSER;
82 case FLV_CODECID_NELLYMOSER:
83 acodec->codec_id = CODEC_ID_NELLYMOSER;
86 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
87 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
91 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
92 AVCodecContext *vcodec = vstream->codec;
94 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
95 case FLV_CODECID_REALH263: vcodec->codec_id = CODEC_ID_H263 ; break; // Really mean it this time
96 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
97 case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
98 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
99 case FLV_CODECID_VP6A :
100 if(flv_codecid == FLV_CODECID_VP6A)
101 vcodec->codec_id = CODEC_ID_VP6A;
102 if(vcodec->extradata_size != 1) {
103 vcodec->extradata_size = 1;
104 vcodec->extradata = av_malloc(1);
106 vcodec->extradata[0] = avio_r8(s->pb);
107 return 1; // 1 byte body size adjustment for flv_read_packet()
108 case FLV_CODECID_H264:
109 vcodec->codec_id = CODEC_ID_H264;
110 return 3; // not 4, reading packet type will consume one byte
111 case FLV_CODECID_MPEG4:
112 vcodec->codec_id = CODEC_ID_MPEG4;
115 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
116 vcodec->codec_tag = flv_codecid;
122 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
123 int length = avio_rb16(ioc);
124 if(length >= buffsize) {
125 avio_skip(ioc, length);
129 avio_read(ioc, buffer, length);
131 buffer[length] = '\0';
136 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
137 unsigned int timeslen = 0, fileposlen = 0, i;
139 int64_t *times = NULL;
140 int64_t *filepositions = NULL;
141 int ret = AVERROR(ENOSYS);
142 int64_t initial_pos = avio_tell(ioc);
143 AVDictionaryEntry *creator = av_dict_get(s->metadata, "metadatacreator",
146 if (creator && !strcmp(creator->value, "MEGA")) {
147 /* Files with this metadatacreator tag seem to have filepositions
148 * pointing at the 4 trailer bytes of the previous packet,
149 * which isn't the norm (nor what we expect here, nor what
150 * jwplayer + lighttpd expect, nor what flvtool2 produces).
151 * Just ignore the index in this case, instead of risking trying
152 * to adjust it to something that might or might not work. */
156 if(vstream->nb_index_entries>0){
157 av_log(s, AV_LOG_WARNING, "Skiping duplicate index\n");
161 while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
162 int64_t** current_array;
163 unsigned int arraylen;
165 // Expect array object in context
166 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
169 arraylen = avio_rb32(ioc);
173 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){
174 current_array= ×
176 }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){
177 current_array= &filepositions;
178 fileposlen= arraylen;
179 }else // unexpected metatag inside keyframes, will not use such metadata for indexing
182 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
183 ret = AVERROR(ENOMEM);
187 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
188 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
190 current_array[0][i] = av_int2dbl(avio_rb64(ioc));
192 if (times && filepositions) {
193 // All done, exiting at a position allowing amf_parse_object
194 // to finish parsing the object
200 if (timeslen == fileposlen && fileposlen && max_pos <= filepositions[0]) {
201 for(i = 0; i < timeslen; i++)
202 av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
204 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
208 av_freep(&filepositions);
209 avio_seek(ioc, initial_pos, SEEK_SET);
213 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
214 AVCodecContext *acodec, *vcodec;
216 AMFDataType amf_type;
223 amf_type = avio_r8(ioc);
226 case AMF_DATA_TYPE_NUMBER:
227 num_val = av_int2dbl(avio_rb64(ioc)); break;
228 case AMF_DATA_TYPE_BOOL:
229 num_val = avio_r8(ioc); break;
230 case AMF_DATA_TYPE_STRING:
231 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
234 case AMF_DATA_TYPE_OBJECT: {
237 if ((vstream || astream) && ioc->seekable && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
238 if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
240 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
242 while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
243 avio_skip(ioc, keylen); //skip key string
244 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
245 return -1; //if we couldn't skip, bomb out.
247 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
251 case AMF_DATA_TYPE_NULL:
252 case AMF_DATA_TYPE_UNDEFINED:
253 case AMF_DATA_TYPE_UNSUPPORTED:
254 break; //these take up no additional space
255 case AMF_DATA_TYPE_MIXEDARRAY:
256 avio_skip(ioc, 4); //skip 32-bit max array index
257 while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
258 //this is the only case in which we would want a nested parse to not skip over the object
259 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
262 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
265 case AMF_DATA_TYPE_ARRAY: {
266 unsigned int arraylen, i;
268 arraylen = avio_rb32(ioc);
269 for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
270 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
271 return -1; //if we couldn't skip, bomb out.
275 case AMF_DATA_TYPE_DATE:
276 avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
278 default: //unsupported type, we couldn't skip
282 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
283 acodec = astream ? astream->codec : NULL;
284 vcodec = vstream ? vstream->codec : NULL;
286 if (amf_type == AMF_DATA_TYPE_NUMBER) {
287 if (!strcmp(key, "duration"))
288 s->duration = num_val * AV_TIME_BASE;
289 else if (!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
290 vcodec->bit_rate = num_val * 1024.0;
291 else if (!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
292 acodec->bit_rate = num_val * 1024.0;
295 if (!strcmp(key, "duration") ||
296 !strcmp(key, "filesize") ||
297 !strcmp(key, "width") ||
298 !strcmp(key, "height") ||
299 !strcmp(key, "videodatarate") ||
300 !strcmp(key, "framerate") ||
301 !strcmp(key, "videocodecid") ||
302 !strcmp(key, "audiodatarate") ||
303 !strcmp(key, "audiosamplerate") ||
304 !strcmp(key, "audiosamplesize") ||
305 !strcmp(key, "stereo") ||
306 !strcmp(key, "audiocodecid"))
309 if(amf_type == AMF_DATA_TYPE_BOOL) {
310 av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
311 av_dict_set(&s->metadata, key, str_val, 0);
312 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
313 snprintf(str_val, sizeof(str_val), "%.f", num_val);
314 av_dict_set(&s->metadata, key, str_val, 0);
315 } else if(amf_type == AMF_DATA_TYPE_OBJECT){
316 if(s->nb_streams==1 && ((!acodec && !strcmp(key, "audiocodecid")) || (!vcodec && !strcmp(key, "videocodecid")))){
317 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
319 } else if (amf_type == AMF_DATA_TYPE_STRING)
320 av_dict_set(&s->metadata, key, str_val, 0);
326 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
328 AVStream *stream, *astream, *vstream, *dstream;
331 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
333 vstream = astream = dstream = NULL;
336 //first object needs to be "onMetaData" string
338 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
341 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
342 for(i = 0; i < s->nb_streams; i++) {
343 stream = s->streams[i];
344 if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
345 else if(stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
346 else if(stream->codec->codec_type == AVMEDIA_TYPE_DATA) dstream = stream;
349 //parse the second object (we want a mixed array)
350 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
356 static AVStream *create_stream(AVFormatContext *s, int stream_type){
357 AVStream *st = avformat_new_stream(s, NULL);
360 st->id = stream_type;
361 switch(stream_type) {
362 case FLV_STREAM_TYPE_VIDEO: st->codec->codec_type = AVMEDIA_TYPE_VIDEO; break;
363 case FLV_STREAM_TYPE_AUDIO: st->codec->codec_type = AVMEDIA_TYPE_AUDIO; break;
364 case FLV_STREAM_TYPE_DATA:
365 st->codec->codec_type = AVMEDIA_TYPE_DATA;
366 st->codec->codec_id = CODEC_ID_NONE; // Going to rely on copy for now
367 av_log(s, AV_LOG_DEBUG, "Data stream created\n");
369 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
373 static int flv_read_header(AVFormatContext *s,
374 AVFormatParameters *ap)
379 flags = avio_r8(s->pb);
380 /* old flvtool cleared this field */
381 /* FIXME: better fix needed */
383 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
384 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
387 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
388 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
389 s->ctx_flags |= AVFMTCTX_NOHEADER;
391 if(flags & FLV_HEADER_FLAG_HASVIDEO){
392 if(!create_stream(s, FLV_STREAM_TYPE_VIDEO))
393 return AVERROR(ENOMEM);
395 if(flags & FLV_HEADER_FLAG_HASAUDIO){
396 if(!create_stream(s, FLV_STREAM_TYPE_AUDIO))
397 return AVERROR(ENOMEM);
399 // Flag doesn't indicate whether or not there is script-data present. Must
400 // create that stream if it's encountered.
402 offset = avio_rb32(s->pb);
403 avio_seek(s->pb, offset, SEEK_SET);
411 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
413 av_free(st->codec->extradata);
414 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
415 if (!st->codec->extradata)
416 return AVERROR(ENOMEM);
417 st->codec->extradata_size = size;
418 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
422 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
424 FLVContext *flv = s->priv_data;
425 int ret, i, type, size, flags;
428 int64_t dts, pts = AV_NOPTS_VALUE;
431 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
432 pos = avio_tell(s->pb);
433 type = avio_r8(s->pb);
434 size = avio_rb24(s->pb);
435 dts = avio_rb24(s->pb);
436 dts |= avio_r8(s->pb) << 24;
437 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
440 avio_skip(s->pb, 3); /* stream id, always 0 */
446 next= size + avio_tell(s->pb);
448 if (type == FLV_TAG_TYPE_AUDIO) {
449 stream_type=FLV_STREAM_TYPE_AUDIO;
450 flags = avio_r8(s->pb);
452 } else if (type == FLV_TAG_TYPE_VIDEO) {
453 stream_type=FLV_STREAM_TYPE_VIDEO;
454 flags = avio_r8(s->pb);
456 if ((flags & 0xf0) == 0x50) /* video info / command frame */
458 } else if (type == FLV_TAG_TYPE_META) {
459 if (size > 13+1+4 && dts == 0) { // Header-type metadata stuff
460 flv_read_metabody(s, next);
462 } else if (dts != 0) { // Script-data "special" metadata frames - don't skip
463 stream_type=FLV_STREAM_TYPE_DATA;
468 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
470 avio_seek(s->pb, next, SEEK_SET);
474 /* skip empty data packets */
478 /* now find stream */
479 for(i=0;i<s->nb_streams;i++) {
481 if (st->id == stream_type)
484 if(i == s->nb_streams){
485 av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n");
486 st= create_stream(s, stream_type);
487 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
489 av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard);
490 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))
491 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))
492 || st->discard >= AVDISCARD_ALL
494 avio_seek(s->pb, next, SEEK_SET);
497 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
498 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
502 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
503 if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
505 const int64_t pos= avio_tell(s->pb);
506 const int64_t fsize= avio_size(s->pb);
507 avio_seek(s->pb, fsize-4, SEEK_SET);
508 size= avio_rb32(s->pb);
509 avio_seek(s->pb, fsize-3-size, SEEK_SET);
510 if(size == avio_rb24(s->pb) + 11){
511 uint32_t ts = avio_rb24(s->pb);
512 ts |= avio_r8(s->pb) << 24;
513 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
515 avio_seek(s->pb, pos, SEEK_SET);
518 if(stream_type == FLV_STREAM_TYPE_AUDIO){
519 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
520 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
521 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
522 st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
524 if(!st->codec->codec_id){
525 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
527 } else if(stream_type == FLV_STREAM_TYPE_VIDEO) {
528 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
531 if (st->codec->codec_id == CODEC_ID_AAC ||
532 st->codec->codec_id == CODEC_ID_H264 ||
533 st->codec->codec_id == CODEC_ID_MPEG4) {
534 int type = avio_r8(s->pb);
536 if (st->codec->codec_id == CODEC_ID_H264 || st->codec->codec_id == CODEC_ID_MPEG4) {
537 int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
539 if (cts < 0) { // dts are wrong
541 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
544 dts = AV_NOPTS_VALUE;
547 if (type == 0 && !st->codec->extradata) {
548 if ((ret = flv_get_extradata(s, st, size)) < 0)
550 if (st->codec->codec_id == CODEC_ID_AAC) {
551 MPEG4AudioConfig cfg;
552 avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
553 st->codec->extradata_size);
554 st->codec->channels = cfg.channels;
555 if (cfg.ext_sample_rate)
556 st->codec->sample_rate = cfg.ext_sample_rate;
558 st->codec->sample_rate = cfg.sample_rate;
559 av_dlog(s, "mp4a config channels %d sample rate %d\n",
560 st->codec->channels, st->codec->sample_rate);
563 ret = AVERROR(EAGAIN);
568 /* skip empty data packets */
570 ret = AVERROR(EAGAIN);
574 ret= av_get_packet(s->pb, pkt, size);
578 /* note: we need to modify the packet size here to handle the last
582 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
583 pkt->stream_index = st->index;
584 if(st->codec->codec_id == CODEC_ID_NELLYMOSER)
585 av_packet_new_side_data(pkt, 'F', 1)[0]= flags;
587 if ( stream_type == FLV_STREAM_TYPE_AUDIO ||
588 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||
589 stream_type == FLV_STREAM_TYPE_DATA)
590 pkt->flags |= AV_PKT_FLAG_KEY;
597 static int flv_read_seek(AVFormatContext *s, int stream_index,
598 int64_t ts, int flags)
600 return avio_seek_time(s->pb, stream_index, ts, flags);
603 #if 0 /* don't know enough to implement this */
604 static int flv_read_seek2(AVFormatContext *s, int stream_index,
605 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
607 int ret = AVERROR(ENOSYS);
609 if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
611 if (!s->pb->seekable) {
612 if (stream_index < 0) {
613 stream_index = av_find_default_stream_index(s);
614 if (stream_index < 0)
617 /* timestamp for default must be expressed in AV_TIME_BASE units */
618 ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
619 flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
621 ret = avio_seek_time(s->pb, stream_index, ts, flags);
624 if (ret == AVERROR(ENOSYS))
625 ret = av_seek_frame(s, stream_index, ts, flags);
630 AVInputFormat ff_flv_demuxer = {
632 .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
633 .priv_data_size = sizeof(FLVContext),
634 .read_probe = flv_probe,
635 .read_header = flv_read_header,
636 .read_packet = flv_read_packet,
637 .read_seek = flv_read_seek,
639 .read_seek2 = flv_read_seek2,
642 .value = CODEC_ID_FLV1,