3 * Copyright (c) 2003 The Libav 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 Libav.
12 * Libav 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 * Libav 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 Libav; 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"
34 #include "avio_internal.h"
37 #define KEYFRAMES_TAG "keyframes"
38 #define KEYFRAMES_TIMESTAMP_TAG "times"
39 #define KEYFRAMES_BYTEOFFSET_TAG "filepositions"
42 int wrong_dts; ///< wrong dts due to negative cts
45 static int flv_probe(AVProbeData *p)
50 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
51 return AVPROBE_SCORE_MAX;
56 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
57 AVCodecContext *acodec = astream->codec;
59 //no distinction between S16 and S8 PCM codec flags
61 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
68 case FLV_CODECID_PCM_LE:
69 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
70 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
71 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
72 case FLV_CODECID_SPEEX:
73 acodec->codec_id = CODEC_ID_SPEEX;
74 acodec->sample_rate = 16000;
76 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
77 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
78 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
79 acodec->codec_id = CODEC_ID_NELLYMOSER;
81 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
82 acodec->sample_rate = 16000;
83 acodec->codec_id = CODEC_ID_NELLYMOSER;
85 case FLV_CODECID_NELLYMOSER:
86 acodec->codec_id = CODEC_ID_NELLYMOSER;
89 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
90 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
94 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
95 AVCodecContext *vcodec = vstream->codec;
97 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
98 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
99 case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
100 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
101 case FLV_CODECID_VP6A :
102 if(flv_codecid == FLV_CODECID_VP6A)
103 vcodec->codec_id = CODEC_ID_VP6A;
104 if(vcodec->extradata_size != 1) {
105 vcodec->extradata_size = 1;
106 vcodec->extradata = av_malloc(1);
108 vcodec->extradata[0] = avio_r8(s->pb);
109 return 1; // 1 byte body size adjustment for flv_read_packet()
110 case FLV_CODECID_H264:
111 vcodec->codec_id = CODEC_ID_H264;
112 return 3; // not 4, reading packet type will consume one byte
114 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
115 vcodec->codec_tag = flv_codecid;
121 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
122 int length = avio_rb16(ioc);
123 if(length >= buffsize) {
124 avio_skip(ioc, length);
128 avio_read(ioc, buffer, length);
130 buffer[length] = '\0';
135 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
136 unsigned int arraylen = 0, 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 while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
157 int64_t* current_array;
159 // Expect array object in context
160 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
163 arraylen = avio_rb32(ioc);
165 * Expect only 'times' or 'filepositions' sub-arrays in other case refuse to use such metadata
168 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) {
169 if (!(times = av_mallocz(sizeof(*times) * arraylen))) {
170 ret = AVERROR(ENOMEM);
174 current_array = times;
175 } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions) {
176 if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) {
177 ret = AVERROR(ENOMEM);
180 fileposlen = arraylen;
181 current_array = filepositions;
182 } else // unexpected metatag inside keyframes, will not use such metadata for indexing
185 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
186 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
188 num_val = av_int2dbl(avio_rb64(ioc));
189 current_array[i] = num_val;
191 if (times && filepositions) {
192 // All done, exiting at a position allowing amf_parse_object
193 // to finish parsing the object
199 if (!ret && timeslen == fileposlen)
200 for (i = 0; i < fileposlen; i++)
201 av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
203 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
207 av_freep(&filepositions);
208 // If we got unexpected data, but successfully reset back to
209 // the start pos, the caller can continue parsing
210 if (ret < 0 && avio_seek(ioc, initial_pos, SEEK_SET) > 0)
215 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
216 AVCodecContext *acodec, *vcodec;
218 AMFDataType amf_type;
225 amf_type = avio_r8(ioc);
228 case AMF_DATA_TYPE_NUMBER:
229 num_val = av_int2dbl(avio_rb64(ioc)); break;
230 case AMF_DATA_TYPE_BOOL:
231 num_val = avio_r8(ioc); break;
232 case AMF_DATA_TYPE_STRING:
233 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
236 case AMF_DATA_TYPE_OBJECT: {
239 if (key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
240 if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0)
243 while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
244 avio_skip(ioc, keylen); //skip key string
245 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
246 return -1; //if we couldn't skip, bomb out.
248 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
252 case AMF_DATA_TYPE_NULL:
253 case AMF_DATA_TYPE_UNDEFINED:
254 case AMF_DATA_TYPE_UNSUPPORTED:
255 break; //these take up no additional space
256 case AMF_DATA_TYPE_MIXEDARRAY:
257 avio_skip(ioc, 4); //skip 32-bit max array index
258 while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
259 //this is the only case in which we would want a nested parse to not skip over the object
260 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
263 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
266 case AMF_DATA_TYPE_ARRAY: {
267 unsigned int arraylen, i;
269 arraylen = avio_rb32(ioc);
270 for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
271 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
272 return -1; //if we couldn't skip, bomb out.
276 case AMF_DATA_TYPE_DATE:
277 avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
279 default: //unsupported type, we couldn't skip
283 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
284 acodec = astream ? astream->codec : NULL;
285 vcodec = vstream ? vstream->codec : NULL;
287 if(amf_type == AMF_DATA_TYPE_BOOL) {
288 av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
289 av_dict_set(&s->metadata, key, str_val, 0);
290 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
291 snprintf(str_val, sizeof(str_val), "%.f", num_val);
292 av_dict_set(&s->metadata, key, str_val, 0);
293 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
294 else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
295 vcodec->bit_rate = num_val * 1024.0;
296 else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
297 acodec->bit_rate = num_val * 1024.0;
298 } else if (amf_type == AMF_DATA_TYPE_STRING)
299 av_dict_set(&s->metadata, key, str_val, 0);
305 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
307 AVStream *stream, *astream, *vstream;
310 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
316 //first object needs to be "onMetaData" string
318 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
321 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
322 for(i = 0; i < s->nb_streams; i++) {
323 stream = s->streams[i];
324 if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
325 else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
328 //parse the second object (we want a mixed array)
329 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
335 static AVStream *create_stream(AVFormatContext *s, int is_audio){
336 AVStream *st = av_new_stream(s, is_audio);
339 st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
340 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
344 static int flv_read_header(AVFormatContext *s,
345 AVFormatParameters *ap)
350 flags = avio_r8(s->pb);
351 /* old flvtool cleared this field */
352 /* FIXME: better fix needed */
354 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
355 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
358 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
359 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
360 s->ctx_flags |= AVFMTCTX_NOHEADER;
362 if(flags & FLV_HEADER_FLAG_HASVIDEO){
363 if(!create_stream(s, 0))
364 return AVERROR(ENOMEM);
366 if(flags & FLV_HEADER_FLAG_HASAUDIO){
367 if(!create_stream(s, 1))
368 return AVERROR(ENOMEM);
371 offset = avio_rb32(s->pb);
372 avio_seek(s->pb, offset, SEEK_SET);
380 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
382 av_free(st->codec->extradata);
383 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
384 if (!st->codec->extradata)
385 return AVERROR(ENOMEM);
386 st->codec->extradata_size = size;
387 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
391 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
393 FLVContext *flv = s->priv_data;
394 int ret, i, type, size, flags, is_audio;
396 int64_t dts, pts = AV_NOPTS_VALUE;
399 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
400 pos = avio_tell(s->pb);
401 type = avio_r8(s->pb);
402 size = avio_rb24(s->pb);
403 dts = avio_rb24(s->pb);
404 dts |= avio_r8(s->pb) << 24;
405 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
406 if (s->pb->eof_reached)
408 avio_skip(s->pb, 3); /* stream id, always 0 */
414 next= size + avio_tell(s->pb);
416 if (type == FLV_TAG_TYPE_AUDIO) {
418 flags = avio_r8(s->pb);
420 } else if (type == FLV_TAG_TYPE_VIDEO) {
422 flags = avio_r8(s->pb);
424 if ((flags & 0xf0) == 0x50) /* video info / command frame */
427 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
428 flv_read_metabody(s, next);
429 else /* skip packet */
430 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
432 avio_seek(s->pb, next, SEEK_SET);
436 /* skip empty data packets */
440 /* now find stream */
441 for(i=0;i<s->nb_streams;i++) {
443 if (st->id == is_audio)
446 if(i == s->nb_streams){
447 av_log(s, AV_LOG_ERROR, "invalid stream\n");
448 st= create_stream(s, is_audio);
449 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
451 av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
452 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
453 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
454 || st->discard >= AVDISCARD_ALL
456 avio_seek(s->pb, next, SEEK_SET);
459 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
460 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
464 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
465 if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
467 const int64_t pos= avio_tell(s->pb);
468 const int64_t fsize= avio_size(s->pb);
469 avio_seek(s->pb, fsize-4, SEEK_SET);
470 size= avio_rb32(s->pb);
471 avio_seek(s->pb, fsize-3-size, SEEK_SET);
472 if(size == avio_rb24(s->pb) + 11){
473 uint32_t ts = avio_rb24(s->pb);
474 ts |= avio_r8(s->pb) << 24;
475 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
477 avio_seek(s->pb, pos, SEEK_SET);
481 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
482 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
483 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
484 st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
486 if(!st->codec->codec_id){
487 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
490 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
493 if (st->codec->codec_id == CODEC_ID_AAC ||
494 st->codec->codec_id == CODEC_ID_H264) {
495 int type = avio_r8(s->pb);
497 if (st->codec->codec_id == CODEC_ID_H264) {
498 int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
500 if (cts < 0) { // dts are wrong
502 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
505 dts = AV_NOPTS_VALUE;
508 if ((ret = flv_get_extradata(s, st, size)) < 0)
510 if (st->codec->codec_id == CODEC_ID_AAC) {
511 MPEG4AudioConfig cfg;
512 ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
513 st->codec->extradata_size);
514 st->codec->channels = cfg.channels;
515 if (cfg.ext_sample_rate)
516 st->codec->sample_rate = cfg.ext_sample_rate;
518 st->codec->sample_rate = cfg.sample_rate;
519 av_dlog(s, "mp4a config channels %d sample rate %d\n",
520 st->codec->channels, st->codec->sample_rate);
523 ret = AVERROR(EAGAIN);
528 /* skip empty data packets */
530 ret = AVERROR(EAGAIN);
534 ret= av_get_packet(s->pb, pkt, size);
538 /* note: we need to modify the packet size here to handle the last
542 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
543 pkt->stream_index = st->index;
545 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
546 pkt->flags |= AV_PKT_FLAG_KEY;
553 static int flv_read_seek(AVFormatContext *s, int stream_index,
554 int64_t ts, int flags)
556 return avio_seek_time(s->pb, stream_index, ts, flags);
559 #if 0 /* don't know enough to implement this */
560 static int flv_read_seek2(AVFormatContext *s, int stream_index,
561 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
563 int ret = AVERROR(ENOSYS);
565 if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
567 if (!s->pb->seekable) {
568 if (stream_index < 0) {
569 stream_index = av_find_default_stream_index(s);
570 if (stream_index < 0)
573 /* timestamp for default must be expressed in AV_TIME_BASE units */
574 ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
575 flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
577 ret = avio_seek_time(s->pb, stream_index, ts, flags);
580 if (ret == AVERROR(ENOSYS))
581 ret = av_seek_frame(s, stream_index, ts, flags);
586 AVInputFormat ff_flv_demuxer = {
588 .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
589 .priv_data_size = sizeof(FLVContext),
590 .read_probe = flv_probe,
591 .read_header = flv_read_header,
592 .read_packet = flv_read_packet,
593 .read_seek = flv_read_seek,
595 .read_seek2 = flv_read_seek2,
598 .value = CODEC_ID_FLV1,