flvdec.c
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1 /*
2  * FLV demuxer
3  * Copyright (c) 2003 The Libav Project
4  *
5  * This demuxer will generate a 1 byte extradata for VP6F content.
6  * It is composed of:
7  * - upper 4bits: difference between encoded width and visible width
8  * - lower 4bits: difference between encoded height and visible height
9  *
10  * This file is part of Libav.
11  *
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.
16  *
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.
21  *
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
25  */
26 
27 #include "libavutil/avstring.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/intfloat.h"
30 #include "libavutil/mathematics.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/mpeg4audio.h"
33 #include "avformat.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36 #include "flv.h"
37 
38 #define KEYFRAMES_TAG "keyframes"
39 #define KEYFRAMES_TIMESTAMP_TAG "times"
40 #define KEYFRAMES_BYTEOFFSET_TAG "filepositions"
41 
42 typedef struct {
43  int wrong_dts;
44  uint8_t *new_extradata[2];
45  int new_extradata_size[2];
48 } FLVContext;
49 
50 static int flv_probe(AVProbeData *p)
51 {
52  const uint8_t *d;
53 
54  d = p->buf;
55  if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
56  return AVPROBE_SCORE_MAX;
57  }
58  return 0;
59 }
60 
61 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, AVCodecContext *acodec, int flv_codecid) {
62  switch(flv_codecid) {
63  //no distinction between S16 and S8 PCM codec flags
64  case FLV_CODECID_PCM:
65  acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
66 #if HAVE_BIGENDIAN
68 #else
70 #endif
71  break;
72  case FLV_CODECID_PCM_LE:
73  acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
74  case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
75  case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
76  case FLV_CODECID_SPEEX:
77  acodec->codec_id = CODEC_ID_SPEEX;
78  acodec->sample_rate = 16000;
79  break;
80  case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
82  acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
83  acodec->codec_id = CODEC_ID_NELLYMOSER;
84  break;
86  acodec->sample_rate = 16000;
87  acodec->codec_id = CODEC_ID_NELLYMOSER;
88  break;
90  acodec->codec_id = CODEC_ID_NELLYMOSER;
91  break;
92  default:
93  av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
94  acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
95  }
96 }
97 
98 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
99  AVCodecContext *vcodec = vstream->codec;
100  switch(flv_codecid) {
101  case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
102  case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
103  case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
104  case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
105  case FLV_CODECID_VP6A :
106  if(flv_codecid == FLV_CODECID_VP6A)
107  vcodec->codec_id = CODEC_ID_VP6A;
108  if(vcodec->extradata_size != 1) {
109  vcodec->extradata_size = 1;
110  vcodec->extradata = av_malloc(1);
111  }
112  vcodec->extradata[0] = avio_r8(s->pb);
113  return 1; // 1 byte body size adjustment for flv_read_packet()
114  case FLV_CODECID_H264:
115  vcodec->codec_id = CODEC_ID_H264;
116  return 3; // not 4, reading packet type will consume one byte
117  default:
118  av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
119  vcodec->codec_tag = flv_codecid;
120  }
121 
122  return 0;
123 }
124 
125 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
126  int length = avio_rb16(ioc);
127  if(length >= buffsize) {
128  avio_skip(ioc, length);
129  return -1;
130  }
131 
132  avio_read(ioc, buffer, length);
133 
134  buffer[length] = '\0';
135 
136  return length;
137 }
138 
139 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
140  unsigned int arraylen = 0, timeslen = 0, fileposlen = 0, i;
141  double num_val;
142  char str_val[256];
143  int64_t *times = NULL;
144  int64_t *filepositions = NULL;
145  int ret = AVERROR(ENOSYS);
146  int64_t initial_pos = avio_tell(ioc);
147  AVDictionaryEntry *creator = av_dict_get(s->metadata, "metadatacreator",
148  NULL, 0);
149 
150  if (creator && !strcmp(creator->value, "MEGA")) {
151  /* Files with this metadatacreator tag seem to have filepositions
152  * pointing at the 4 trailer bytes of the previous packet,
153  * which isn't the norm (nor what we expect here, nor what
154  * jwplayer + lighttpd expect, nor what flvtool2 produces).
155  * Just ignore the index in this case, instead of risking trying
156  * to adjust it to something that might or might not work. */
157  return 0;
158  }
159 
160  while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
161  int64_t* current_array;
162 
163  // Expect array object in context
164  if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
165  break;
166 
167  arraylen = avio_rb32(ioc);
168  if (arraylen >> 28)
169  break;
170 
171  /*
172  * Expect only 'times' or 'filepositions' sub-arrays in other case refuse to use such metadata
173  * for indexing
174  */
175  if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) {
176  if (!(times = av_mallocz(sizeof(*times) * arraylen))) {
177  ret = AVERROR(ENOMEM);
178  goto finish;
179  }
180  timeslen = arraylen;
181  current_array = times;
182  } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions) {
183  if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) {
184  ret = AVERROR(ENOMEM);
185  goto finish;
186  }
187  fileposlen = arraylen;
188  current_array = filepositions;
189  } else // unexpected metatag inside keyframes, will not use such metadata for indexing
190  break;
191 
192  for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
193  if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
194  goto finish;
195  num_val = av_int2double(avio_rb64(ioc));
196  current_array[i] = num_val;
197  }
198  if (times && filepositions) {
199  // All done, exiting at a position allowing amf_parse_object
200  // to finish parsing the object
201  ret = 0;
202  break;
203  }
204  }
205 
206  if (!ret && timeslen == fileposlen)
207  for (i = 0; i < fileposlen; i++)
208  av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
209  else
210  av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
211 
212 finish:
213  av_freep(&times);
214  av_freep(&filepositions);
215  // If we got unexpected data, but successfully reset back to
216  // the start pos, the caller can continue parsing
217  if (ret < 0 && avio_seek(ioc, initial_pos, SEEK_SET) > 0)
218  return 0;
219  return ret;
220 }
221 
222 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
223  AVCodecContext *acodec, *vcodec;
224  AVIOContext *ioc;
225  AMFDataType amf_type;
226  char str_val[256];
227  double num_val;
228 
229  num_val = 0;
230  ioc = s->pb;
231 
232  amf_type = avio_r8(ioc);
233 
234  switch(amf_type) {
236  num_val = av_int2double(avio_rb64(ioc)); break;
237  case AMF_DATA_TYPE_BOOL:
238  num_val = avio_r8(ioc); break;
240  if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
241  return -1;
242  break;
243  case AMF_DATA_TYPE_OBJECT: {
244  unsigned int keylen;
245 
246  if ((vstream || astream) && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
247  if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
248  max_pos) < 0)
249  return -1;
250 
251  while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
252  avio_skip(ioc, keylen); //skip key string
253  if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
254  return -1; //if we couldn't skip, bomb out.
255  }
256  if(avio_r8(ioc) != AMF_END_OF_OBJECT)
257  return -1;
258  }
259  break;
260  case AMF_DATA_TYPE_NULL:
263  break; //these take up no additional space
265  avio_skip(ioc, 4); //skip 32-bit max array index
266  while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
267  //this is the only case in which we would want a nested parse to not skip over the object
268  if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
269  return -1;
270  }
271  if(avio_r8(ioc) != AMF_END_OF_OBJECT)
272  return -1;
273  break;
274  case AMF_DATA_TYPE_ARRAY: {
275  unsigned int arraylen, i;
276 
277  arraylen = avio_rb32(ioc);
278  for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
279  if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
280  return -1; //if we couldn't skip, bomb out.
281  }
282  }
283  break;
284  case AMF_DATA_TYPE_DATE:
285  avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
286  break;
287  default: //unsupported type, we couldn't skip
288  return -1;
289  }
290 
291  if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
292  acodec = astream ? astream->codec : NULL;
293  vcodec = vstream ? vstream->codec : NULL;
294 
295  if (amf_type == AMF_DATA_TYPE_NUMBER) {
296  if (!strcmp(key, "duration"))
297  s->duration = num_val * AV_TIME_BASE;
298  else if (!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
299  vcodec->bit_rate = num_val * 1024.0;
300  else if (!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
301  acodec->bit_rate = num_val * 1024.0;
302  }
303 
304  if (!strcmp(key, "duration") ||
305  !strcmp(key, "filesize") ||
306  !strcmp(key, "width") ||
307  !strcmp(key, "height") ||
308  !strcmp(key, "videodatarate") ||
309  !strcmp(key, "framerate") ||
310  !strcmp(key, "videocodecid") ||
311  !strcmp(key, "audiodatarate") ||
312  !strcmp(key, "audiosamplerate") ||
313  !strcmp(key, "audiosamplesize") ||
314  !strcmp(key, "stereo") ||
315  !strcmp(key, "audiocodecid"))
316  return 0;
317 
318  if(amf_type == AMF_DATA_TYPE_BOOL) {
319  av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
320  av_dict_set(&s->metadata, key, str_val, 0);
321  } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
322  snprintf(str_val, sizeof(str_val), "%.f", num_val);
323  av_dict_set(&s->metadata, key, str_val, 0);
324  } else if (amf_type == AMF_DATA_TYPE_STRING)
325  av_dict_set(&s->metadata, key, str_val, 0);
326  }
327 
328  return 0;
329 }
330 
331 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
332  AMFDataType type;
333  AVStream *stream, *astream, *vstream;
334  AVIOContext *ioc;
335  int i;
336  char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
337 
338  astream = NULL;
339  vstream = NULL;
340  ioc = s->pb;
341 
342  //first object needs to be "onMetaData" string
343  type = avio_r8(ioc);
344  if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
345  return -1;
346 
347  //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
348  for(i = 0; i < s->nb_streams; i++) {
349  stream = s->streams[i];
350  if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
351  else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
352  }
353 
354  //parse the second object (we want a mixed array)
355  if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
356  return -1;
357 
358  return 0;
359 }
360 
361 static AVStream *create_stream(AVFormatContext *s, int is_audio){
363  if (!st)
364  return NULL;
365  st->id = is_audio;
367  avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
368  return st;
369 }
370 
372  AVFormatParameters *ap)
373 {
374  int offset, flags;
375 
376  avio_skip(s->pb, 4);
377  flags = avio_r8(s->pb);
378  /* old flvtool cleared this field */
379  /* FIXME: better fix needed */
380  if (!flags) {
382  av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
383  }
384 
388 
389  if(flags & FLV_HEADER_FLAG_HASVIDEO){
390  if(!create_stream(s, 0))
391  return AVERROR(ENOMEM);
392  }
393  if(flags & FLV_HEADER_FLAG_HASAUDIO){
394  if(!create_stream(s, 1))
395  return AVERROR(ENOMEM);
396  }
397 
398  offset = avio_rb32(s->pb);
399  avio_seek(s->pb, offset, SEEK_SET);
400  avio_skip(s->pb, 4);
401 
402  s->start_time = 0;
403 
404  return 0;
405 }
406 
408 {
409  FLVContext *flv = s->priv_data;
410  av_freep(&flv->new_extradata[0]);
411  av_freep(&flv->new_extradata[1]);
412  return 0;
413 }
414 
416 {
417  av_free(st->codec->extradata);
419  if (!st->codec->extradata)
420  return AVERROR(ENOMEM);
421  st->codec->extradata_size = size;
423  return 0;
424 }
425 
426 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
427  int size)
428 {
429  av_free(flv->new_extradata[stream]);
431  if (!flv->new_extradata[stream])
432  return AVERROR(ENOMEM);
433  flv->new_extradata_size[stream] = size;
434  avio_read(pb, flv->new_extradata[stream], size);
435  return 0;
436 }
437 
439 {
440  FLVContext *flv = s->priv_data;
441  int ret, i, type, size, flags, is_audio;
442  int64_t next, pos;
443  int64_t dts, pts = AV_NOPTS_VALUE;
444  int sample_rate = 0, channels = 0;
445  AVStream *st = NULL;
446 
447  for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
448  pos = avio_tell(s->pb);
449  type = avio_r8(s->pb);
450  size = avio_rb24(s->pb);
451  dts = avio_rb24(s->pb);
452  dts |= avio_r8(s->pb) << 24;
453  av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
454  if (s->pb->eof_reached)
455  return AVERROR_EOF;
456  avio_skip(s->pb, 3); /* stream id, always 0 */
457  flags = 0;
458 
459  if(size == 0)
460  continue;
461 
462  next= size + avio_tell(s->pb);
463 
464  if (type == FLV_TAG_TYPE_AUDIO) {
465  is_audio=1;
466  flags = avio_r8(s->pb);
467  size--;
468  } else if (type == FLV_TAG_TYPE_VIDEO) {
469  is_audio=0;
470  flags = avio_r8(s->pb);
471  size--;
472  if ((flags & 0xf0) == 0x50) /* video info / command frame */
473  goto skip;
474  } else {
475  if (type == FLV_TAG_TYPE_META && size > 13+1+4)
476  flv_read_metabody(s, next);
477  else /* skip packet */
478  av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
479  skip:
480  avio_seek(s->pb, next, SEEK_SET);
481  continue;
482  }
483 
484  /* skip empty data packets */
485  if (!size)
486  continue;
487 
488  /* now find stream */
489  for(i=0;i<s->nb_streams;i++) {
490  st = s->streams[i];
491  if (st->id == is_audio)
492  break;
493  }
494  if(i == s->nb_streams){
495  av_log(s, AV_LOG_ERROR, "invalid stream\n");
496  st= create_stream(s, is_audio);
498  }
499  av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
500  if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
501  ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
502  || st->discard >= AVDISCARD_ALL
503  ){
504  avio_seek(s->pb, next, SEEK_SET);
505  continue;
506  }
507  if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
508  av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
509  break;
510  }
511 
512  // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
513  if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
514  int size;
515  const int64_t pos= avio_tell(s->pb);
516  const int64_t fsize= avio_size(s->pb);
517  avio_seek(s->pb, fsize-4, SEEK_SET);
518  size= avio_rb32(s->pb);
519  avio_seek(s->pb, fsize-3-size, SEEK_SET);
520  if(size == avio_rb24(s->pb) + 11){
521  uint32_t ts = avio_rb24(s->pb);
522  ts |= avio_r8(s->pb) << 24;
523  s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
524  }
525  avio_seek(s->pb, pos, SEEK_SET);
526  }
527 
528  if(is_audio){
529  int bits_per_coded_sample;
530  channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
531  sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
532  bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
533  if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
534  st->codec->channels = channels;
535  st->codec->sample_rate = sample_rate;
536  st->codec->bits_per_coded_sample = bits_per_coded_sample;
537  }
538  if(!st->codec->codec_id){
539  flv_set_audio_codec(s, st, st->codec, flags & FLV_AUDIO_CODECID_MASK);
540  flv->last_sample_rate = st->codec->sample_rate;
541  flv->last_channels = st->codec->channels;
542  } else {
543  AVCodecContext ctx;
544  ctx.sample_rate = sample_rate;
545  flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);
546  sample_rate = ctx.sample_rate;
547  }
548  }else{
549  size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
550  }
551 
552  if (st->codec->codec_id == CODEC_ID_AAC ||
553  st->codec->codec_id == CODEC_ID_H264) {
554  int type = avio_r8(s->pb);
555  size--;
556  if (st->codec->codec_id == CODEC_ID_H264) {
557  int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
558  pts = dts + cts;
559  if (cts < 0) { // dts are wrong
560  flv->wrong_dts = 1;
561  av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
562  }
563  if (flv->wrong_dts)
564  dts = AV_NOPTS_VALUE;
565  }
566  if (type == 0) {
567  if (st->codec->extradata) {
568  if ((ret = flv_queue_extradata(flv, s->pb, is_audio, size)) < 0)
569  return ret;
570  ret = AVERROR(EAGAIN);
571  goto leave;
572  }
573  if ((ret = flv_get_extradata(s, st, size)) < 0)
574  return ret;
575  if (st->codec->codec_id == CODEC_ID_AAC) {
576  MPEG4AudioConfig cfg;
578  st->codec->extradata_size * 8, 1);
579  st->codec->channels = cfg.channels;
580  if (cfg.ext_sample_rate)
581  st->codec->sample_rate = cfg.ext_sample_rate;
582  else
583  st->codec->sample_rate = cfg.sample_rate;
584  av_dlog(s, "mp4a config channels %d sample rate %d\n",
585  st->codec->channels, st->codec->sample_rate);
586  }
587 
588  ret = AVERROR(EAGAIN);
589  goto leave;
590  }
591  }
592 
593  /* skip empty data packets */
594  if (!size) {
595  ret = AVERROR(EAGAIN);
596  goto leave;
597  }
598 
599  ret= av_get_packet(s->pb, pkt, size);
600  if (ret < 0) {
601  return AVERROR(EIO);
602  }
603  /* note: we need to modify the packet size here to handle the last
604  packet */
605  pkt->size = ret;
606  pkt->dts = dts;
607  pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
608  pkt->stream_index = st->index;
609  if (flv->new_extradata[is_audio]) {
611  flv->new_extradata_size[is_audio]);
612  if (side) {
613  memcpy(side, flv->new_extradata[is_audio],
614  flv->new_extradata_size[is_audio]);
615  av_freep(&flv->new_extradata[is_audio]);
616  flv->new_extradata_size[is_audio] = 0;
617  }
618  }
619  if (is_audio && (sample_rate != flv->last_sample_rate ||
620  channels != flv->last_channels)) {
621  flv->last_sample_rate = sample_rate;
622  flv->last_channels = channels;
623  ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
624  }
625 
626  if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
627  pkt->flags |= AV_PKT_FLAG_KEY;
628 
629 leave:
630  avio_skip(s->pb, 4);
631  return ret;
632 }
633 
634 static int flv_read_seek(AVFormatContext *s, int stream_index,
635  int64_t ts, int flags)
636 {
637  return avio_seek_time(s->pb, stream_index, ts, flags);
638 }
639 
640 #if 0 /* don't know enough to implement this */
641 static int flv_read_seek2(AVFormatContext *s, int stream_index,
642  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
643 {
644  int ret = AVERROR(ENOSYS);
645 
646  if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
647 
648  if (!s->pb->seekable) {
649  if (stream_index < 0) {
650  stream_index = av_find_default_stream_index(s);
651  if (stream_index < 0)
652  return -1;
653 
654  /* timestamp for default must be expressed in AV_TIME_BASE units */
655  ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
657  }
658  ret = avio_seek_time(s->pb, stream_index, ts, flags);
659  }
660 
661  if (ret == AVERROR(ENOSYS))
662  ret = av_seek_frame(s, stream_index, ts, flags);
663  return ret;
664 }
665 #endif
666 
668  .name = "flv",
669  .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
670  .priv_data_size = sizeof(FLVContext),
675 #if 0
676  .read_seek2 = flv_read_seek2,
677 #endif
679  .extensions = "flv",
680  .value = CODEC_ID_FLV1,
681 };
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:1618
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:154
Bytestream IO Context.
Definition: avio.h:68
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:281
int size
AV_WL32 AV_WL24 AV_WL16 AV_RB32
Definition: bytestream.h:89
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1474
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:76
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the pts for a given stream.
Definition: utils.c:3828
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:117
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:148
int index
stream index in AVFormatContext
Definition: avformat.h:621
int size
Definition: avcodec.h:909
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:211
discard all bidirectional frames
Definition: avcodec.h:528
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:954
static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos)
Definition: flvdec.c:139
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: flvdec.c:438
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:754
uint8_t * new_extradata[2]
Definition: flvdec.c:44
int ctx_flags
Format-specific flags, see AVFMTCTX_xx.
Definition: avformat.h:919
AVDictionaryEntry * av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:27
static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: flvdec.c:634
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:147
Format I/O context.
Definition: avformat.h:863
Public dictionary API.
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:58
Round toward +infinity.
Definition: mathematics.h:70
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:844
#define FLV_AUDIO_CODECID_MASK
Definition: flv.h:42
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:769
int wrong_dts
wrong dts due to negative cts
Definition: flvdec.c:43
int id
format-specific stream ID
Definition: avformat.h:622
enum AVStreamParseType need_parsing
Definition: avformat.h:815
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1387
#define FLV_VIDEO_CODECID_MASK
Definition: flv.h:44
AVStream ** streams
Definition: avformat.h:908
static int read_header(FFV1Context *f)
Definition: ffv1.c:1513
#define KEYFRAMES_BYTEOFFSET_TAG
Definition: flvdec.c:40
static int flags
Definition: log.c:34
#define AVERROR_EOF
End of file.
Definition: error.h:51
#define FLV_AUDIO_SAMPLERATE_OFFSET
Definition: flv.h:33
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:140
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:269
AMFDataType
Definition: flv.h:104
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:842
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:492
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1974
struct FLVContext FLVContext
#define FLV_AUDIO_SAMPLERATE_MASK
Definition: flv.h:41
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:652
#define AVINDEX_KEYFRAME
Definition: avformat.h:590
discard all
Definition: avcodec.h:530
AVDictionary * metadata
Definition: avformat.h:1085
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:137
#define AVERROR(e)
Definition: error.h:43
static int flv_read_close(AVFormatContext *s)
Definition: flvdec.c:407
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
int ff_add_param_change(AVPacket *pkt, int32_t channels, uint64_t channel_layout, int32_t sample_rate, int32_t width, int32_t height)
Add side data to a packet for changing parameters to the given values.
Definition: utils.c:4077
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2776
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:64
int depth
Definition: v4l.c:64
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:914
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
AVCodecContext * codec
codec context
Definition: avformat.h:623
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:341
unsigned int nb_streams
A list of all streams in the file.
Definition: avformat.h:907
#define FLV_AUDIO_CODECID_OFFSET
Definition: flv.h:34
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:122
int bit_rate
the average bitrate
Definition: avcodec.h:1340
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:762
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:277
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:161
int av_find_default_stream_index(AVFormatContext *s)
Definition: utils.c:1341
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:483
static int read_probe(AVProbeData *p)
Definition: img2.c:185
static char buffer[20]
Definition: seek-test.c:34
static int flv_probe(AVProbeData *p)
Definition: flvdec.c:50
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, AVCodecContext *acodec, int flv_codecid)
Definition: flvdec.c:61
#define av_dlog(pctx,...)
av_dlog macros Useful to print debug messages that shouldn't get compiled in normally.
Definition: log.h:158
Stream structure.
Definition: avformat.h:620
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
Definition: flvdec.c:331
NULL
Definition: eval.c:50
FLV common header.
enum AVMediaType codec_type
Definition: avcodec.h:1574
int sample_rate
samples per second
Definition: avcodec.h:1456
AVIOContext * pb
Definition: avformat.h:896
main external API structure.
Definition: avcodec.h:1329
int new_extradata_size[2]
Definition: flvdec.c:45
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1590
int extradata_size
Definition: avcodec.h:1388
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:109
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:50
int last_sample_rate
Definition: flvdec.c:46
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:64
static int flv_read_header(AVFormatContext *s, AVFormatParameters *ap)
Definition: flvdec.c:371
int last_channels
Definition: flvdec.c:47
static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream, int size)
Definition: flvdec.c:426
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:497
This structure contains the data a format has to probe a file.
Definition: avformat.h:339
#define FLV_AUDIO_CHANNEL_MASK
Definition: flv.h:39
Round toward -infinity.
Definition: mathematics.h:69
#define FLV_AUDIO_SAMPLESIZE_MASK
Definition: flv.h:40
#define AMF_END_OF_OBJECT
Definition: flv.h:47
int64_t start_time
Decoding: position of the first frame of the component, in AV_TIME_BASE fractional seconds...
Definition: avformat.h:935
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: utils.c:1796
#define AVPROBE_SCORE_MAX
maximum score, half of that is used for file-extension-based detection
Definition: avformat.h:345
full parsing and repack
Definition: avformat.h:581
Main libavformat public API header.
#define KEYFRAMES_TAG
Definition: flvdec.c:38
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:125
#define FLV_VIDEO_FRAMETYPE_MASK
Definition: flv.h:45
static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
Definition: flvdec.c:125
AVInputFormat ff_flv_demuxer
Definition: flvdec.c:667
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int bit_size, int sync_extension)
Parse MPEG-4 systems extradata to retrieve audio configuration.
Definition: mpeg4audio.c:79
static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid)
Definition: flvdec.c:98
int64_t avio_seek_time(AVIOContext *h, int stream_index, int64_t timestamp, int flags)
Seek to a given timestamp relative to some component stream.
Definition: aviobuf.c:1051
char * value
Definition: dict.h:76
int eof_reached
true if eof reached
Definition: avio.h:98
static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth)
Definition: flvdec.c:222
int channels
number of audio channels
Definition: avcodec.h:1457
void * priv_data
Format private data.
Definition: avformat.h:883
#define KEYFRAMES_TIMESTAMP_TAG
Definition: flvdec.c:39
static AVStream * create_stream(AVFormatContext *s, int is_audio)
Definition: flvdec.c:361
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:907
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
Definition: flvdec.c:415
int64_t duration
Decoding: duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:943
#define AV_LOG_INFO
Definition: log.h:119
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:460
Definition: flv.h:62
discard all frames except keyframes
Definition: avcodec.h:529
int stream_index
Definition: avcodec.h:910
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:660
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:901
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:271
static int read_seek2(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: assdec.c:166
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:336
enum CodecID codec_id
Definition: avcodec.h:1575