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flvdec.c
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1 /*
2  * FLV demuxer
3  * Copyright (c) 2003 The FFmpeg 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 FFmpeg.
11  *
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.
16  *
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.
21  *
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
25  */
26 
27 #include "libavutil/avstring.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/intfloat.h"
32 #include "libavutil/mathematics.h"
33 #include "libavcodec/bytestream.h"
34 #include "libavcodec/mpeg4audio.h"
35 #include "avformat.h"
36 #include "internal.h"
37 #include "avio_internal.h"
38 #include "flv.h"
39 
40 #define VALIDATE_INDEX_TS_THRESH 2500
41 
42 typedef struct FLVContext {
43  const AVClass *class; ///< Class for private options.
44  int trust_metadata; ///< configure streams according onMetaData
45  int wrong_dts; ///< wrong dts due to negative cts
50  struct {
51  int64_t dts;
52  int64_t pos;
53  } validate_index[2];
57 } FLVContext;
58 
59 static int probe(AVProbeData *p, int live)
60 {
61  const uint8_t *d = p->buf;
62  unsigned offset = AV_RB32(d + 5);
63 
64  if (d[0] == 'F' &&
65  d[1] == 'L' &&
66  d[2] == 'V' &&
67  d[3] < 5 && d[5] == 0 &&
68  offset + 100 < p->buf_size &&
69  offset > 8) {
70  int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);
71 
72  if (live == is_live)
73  return AVPROBE_SCORE_MAX;
74  }
75  return 0;
76 }
77 
78 static int flv_probe(AVProbeData *p)
79 {
80  return probe(p, 0);
81 }
82 
84 {
85  return probe(p, 1);
86 }
87 
89 {
91  if (!st)
92  return NULL;
94  if (s->nb_streams>=3 ||( s->nb_streams==2
98 
99  avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
100  return st;
101 }
102 
103 static int flv_same_audio_codec(AVCodecContext *acodec, int flags)
104 {
105  int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
106  int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;
107  int codec_id;
108 
109  if (!acodec->codec_id && !acodec->codec_tag)
110  return 1;
111 
112  if (acodec->bits_per_coded_sample != bits_per_coded_sample)
113  return 0;
114 
115  switch (flv_codecid) {
116  // no distinction between S16 and S8 PCM codec flags
117  case FLV_CODECID_PCM:
118  codec_id = bits_per_coded_sample == 8
120 #if HAVE_BIGENDIAN
122 #else
124 #endif
125  return codec_id == acodec->codec_id;
126  case FLV_CODECID_PCM_LE:
127  codec_id = bits_per_coded_sample == 8
130  return codec_id == acodec->codec_id;
131  case FLV_CODECID_AAC:
132  return acodec->codec_id == AV_CODEC_ID_AAC;
133  case FLV_CODECID_ADPCM:
134  return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF;
135  case FLV_CODECID_SPEEX:
136  return acodec->codec_id == AV_CODEC_ID_SPEEX;
137  case FLV_CODECID_MP3:
138  return acodec->codec_id == AV_CODEC_ID_MP3;
142  return acodec->codec_id == AV_CODEC_ID_NELLYMOSER;
144  return acodec->sample_rate == 8000 &&
145  acodec->codec_id == AV_CODEC_ID_PCM_MULAW;
147  return acodec->sample_rate == 8000 &&
148  acodec->codec_id == AV_CODEC_ID_PCM_ALAW;
149  default:
150  return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
151  }
152 }
153 
155  AVCodecContext *acodec, int flv_codecid)
156 {
157  switch (flv_codecid) {
158  // no distinction between S16 and S8 PCM codec flags
159  case FLV_CODECID_PCM:
160  acodec->codec_id = acodec->bits_per_coded_sample == 8
162 #if HAVE_BIGENDIAN
164 #else
166 #endif
167  break;
168  case FLV_CODECID_PCM_LE:
169  acodec->codec_id = acodec->bits_per_coded_sample == 8
172  break;
173  case FLV_CODECID_AAC:
174  acodec->codec_id = AV_CODEC_ID_AAC;
175  break;
176  case FLV_CODECID_ADPCM:
178  break;
179  case FLV_CODECID_SPEEX:
180  acodec->codec_id = AV_CODEC_ID_SPEEX;
181  acodec->sample_rate = 16000;
182  break;
183  case FLV_CODECID_MP3:
184  acodec->codec_id = AV_CODEC_ID_MP3;
186  break;
188  // in case metadata does not otherwise declare samplerate
189  acodec->sample_rate = 8000;
191  break;
193  acodec->sample_rate = 16000;
195  break;
198  break;
200  acodec->sample_rate = 8000;
202  break;
204  acodec->sample_rate = 8000;
205  acodec->codec_id = AV_CODEC_ID_PCM_ALAW;
206  break;
207  default:
208  avpriv_request_sample(s, "Audio codec (%x)",
209  flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
210  acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
211  }
212 }
213 
214 static int flv_same_video_codec(AVCodecContext *vcodec, int flags)
215 {
216  int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
217 
218  if (!vcodec->codec_id && !vcodec->codec_tag)
219  return 1;
220 
221  switch (flv_codecid) {
222  case FLV_CODECID_H263:
223  return vcodec->codec_id == AV_CODEC_ID_FLV1;
224  case FLV_CODECID_SCREEN:
225  return vcodec->codec_id == AV_CODEC_ID_FLASHSV;
226  case FLV_CODECID_SCREEN2:
227  return vcodec->codec_id == AV_CODEC_ID_FLASHSV2;
228  case FLV_CODECID_VP6:
229  return vcodec->codec_id == AV_CODEC_ID_VP6F;
230  case FLV_CODECID_VP6A:
231  return vcodec->codec_id == AV_CODEC_ID_VP6A;
232  case FLV_CODECID_H264:
233  return vcodec->codec_id == AV_CODEC_ID_H264;
234  default:
235  return vcodec->codec_tag == flv_codecid;
236  }
237 }
238 
240  int flv_codecid, int read)
241 {
242  AVCodecContext *vcodec = vstream->codec;
243  switch (flv_codecid) {
244  case FLV_CODECID_H263:
245  vcodec->codec_id = AV_CODEC_ID_FLV1;
246  break;
248  vcodec->codec_id = AV_CODEC_ID_H263;
249  break; // Really mean it this time
250  case FLV_CODECID_SCREEN:
251  vcodec->codec_id = AV_CODEC_ID_FLASHSV;
252  break;
253  case FLV_CODECID_SCREEN2:
254  vcodec->codec_id = AV_CODEC_ID_FLASHSV2;
255  break;
256  case FLV_CODECID_VP6:
257  vcodec->codec_id = AV_CODEC_ID_VP6F;
258  case FLV_CODECID_VP6A:
259  if (flv_codecid == FLV_CODECID_VP6A)
260  vcodec->codec_id = AV_CODEC_ID_VP6A;
261  if (read) {
262  if (vcodec->extradata_size != 1) {
263  ff_alloc_extradata(vcodec, 1);
264  }
265  if (vcodec->extradata)
266  vcodec->extradata[0] = avio_r8(s->pb);
267  else
268  avio_skip(s->pb, 1);
269  }
270  return 1; // 1 byte body size adjustment for flv_read_packet()
271  case FLV_CODECID_H264:
272  vcodec->codec_id = AV_CODEC_ID_H264;
274  return 3; // not 4, reading packet type will consume one byte
275  case FLV_CODECID_MPEG4:
276  vcodec->codec_id = AV_CODEC_ID_MPEG4;
277  return 3;
278  default:
279  avpriv_request_sample(s, "Video codec (%x)", flv_codecid);
280  vcodec->codec_tag = flv_codecid;
281  }
282 
283  return 0;
284 }
285 
286 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
287 {
288  int length = avio_rb16(ioc);
289  if (length >= buffsize) {
290  avio_skip(ioc, length);
291  return -1;
292  }
293 
294  avio_read(ioc, buffer, length);
295 
296  buffer[length] = '\0';
297 
298  return length;
299 }
300 
302  AVStream *vstream, int64_t max_pos)
303 {
304  FLVContext *flv = s->priv_data;
305  unsigned int timeslen = 0, fileposlen = 0, i;
306  char str_val[256];
307  int64_t *times = NULL;
308  int64_t *filepositions = NULL;
309  int ret = AVERROR(ENOSYS);
310  int64_t initial_pos = avio_tell(ioc);
311 
312  if (vstream->nb_index_entries>0) {
313  av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");
314  return 0;
315  }
316 
317  if (s->flags & AVFMT_FLAG_IGNIDX)
318  return 0;
319 
320  while (avio_tell(ioc) < max_pos - 2 &&
321  amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
322  int64_t **current_array;
323  unsigned int arraylen;
324 
325  // Expect array object in context
326  if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
327  break;
328 
329  arraylen = avio_rb32(ioc);
330  if (arraylen>>28)
331  break;
332 
333  if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
334  current_array = &times;
335  timeslen = arraylen;
336  } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
337  !filepositions) {
338  current_array = &filepositions;
339  fileposlen = arraylen;
340  } else
341  // unexpected metatag inside keyframes, will not use such
342  // metadata for indexing
343  break;
344 
345  if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
346  ret = AVERROR(ENOMEM);
347  goto finish;
348  }
349 
350  for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
351  if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
352  goto invalid;
353  current_array[0][i] = av_int2double(avio_rb64(ioc));
354  }
355  if (times && filepositions) {
356  // All done, exiting at a position allowing amf_parse_object
357  // to finish parsing the object
358  ret = 0;
359  break;
360  }
361  }
362 
363  if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
364  for (i = 0; i < fileposlen; i++) {
365  av_add_index_entry(vstream, filepositions[i], times[i] * 1000,
366  0, 0, AVINDEX_KEYFRAME);
367  if (i < 2) {
368  flv->validate_index[i].pos = filepositions[i];
369  flv->validate_index[i].dts = times[i] * 1000;
370  flv->validate_count = i + 1;
371  }
372  }
373  } else {
374 invalid:
375  av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
376  }
377 
378 finish:
379  av_freep(&times);
380  av_freep(&filepositions);
381  avio_seek(ioc, initial_pos, SEEK_SET);
382  return ret;
383 }
384 
386  AVStream *vstream, const char *key,
387  int64_t max_pos, int depth)
388 {
389  AVCodecContext *acodec, *vcodec;
390  FLVContext *flv = s->priv_data;
391  AVIOContext *ioc;
392  AMFDataType amf_type;
393  char str_val[1024];
394  double num_val;
395 
396  num_val = 0;
397  ioc = s->pb;
398  amf_type = avio_r8(ioc);
399 
400  switch (amf_type) {
402  num_val = av_int2double(avio_rb64(ioc));
403  break;
404  case AMF_DATA_TYPE_BOOL:
405  num_val = avio_r8(ioc);
406  break;
408  if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0) {
409  av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");
410  return -1;
411  }
412  break;
414  if ((vstream || astream) && key &&
415  ioc->seekable &&
416  !strcmp(KEYFRAMES_TAG, key) && depth == 1)
417  if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
418  max_pos) < 0)
419  av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
420 
421  while (avio_tell(ioc) < max_pos - 2 &&
422  amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
423  if (amf_parse_object(s, astream, vstream, str_val, max_pos,
424  depth + 1) < 0)
425  return -1; // if we couldn't skip, bomb out.
426  if (avio_r8(ioc) != AMF_END_OF_OBJECT) {
427  av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");
428  return -1;
429  }
430  break;
431  case AMF_DATA_TYPE_NULL:
434  break; // these take up no additional space
436  avio_skip(ioc, 4); // skip 32-bit max array index
437  while (avio_tell(ioc) < max_pos - 2 &&
438  amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
439  // this is the only case in which we would want a nested
440  // parse to not skip over the object
441  if (amf_parse_object(s, astream, vstream, str_val, max_pos,
442  depth + 1) < 0)
443  return -1;
444  if (avio_r8(ioc) != AMF_END_OF_OBJECT) {
445  av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY\n");
446  return -1;
447  }
448  break;
449  case AMF_DATA_TYPE_ARRAY:
450  {
451  unsigned int arraylen, i;
452 
453  arraylen = avio_rb32(ioc);
454  for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
455  if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
456  depth + 1) < 0)
457  return -1; // if we couldn't skip, bomb out.
458  }
459  break;
460  case AMF_DATA_TYPE_DATE:
461  avio_skip(ioc, 8 + 2); // timestamp (double) and UTC offset (int16)
462  break;
463  default: // unsupported type, we couldn't skip
464  av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);
465  return -1;
466  }
467 
468  if (key) {
469  acodec = astream ? astream->codec : NULL;
470  vcodec = vstream ? vstream->codec : NULL;
471 
472  // stream info doesn't live any deeper than the first object
473  if (depth == 1) {
474  if (amf_type == AMF_DATA_TYPE_NUMBER ||
475  amf_type == AMF_DATA_TYPE_BOOL) {
476  if (!strcmp(key, "duration"))
477  s->duration = num_val * AV_TIME_BASE;
478  else if (!strcmp(key, "videodatarate") && vcodec &&
479  0 <= (int)(num_val * 1024.0))
480  vcodec->bit_rate = num_val * 1024.0;
481  else if (!strcmp(key, "audiodatarate") && acodec &&
482  0 <= (int)(num_val * 1024.0))
483  acodec->bit_rate = num_val * 1024.0;
484  else if (!strcmp(key, "datastream")) {
486  if (!st)
487  return AVERROR(ENOMEM);
489  } else if (flv->trust_metadata) {
490  if (!strcmp(key, "videocodecid") && vcodec) {
491  flv_set_video_codec(s, vstream, num_val, 0);
492  } else if (!strcmp(key, "audiocodecid") && acodec) {
493  int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
494  flv_set_audio_codec(s, astream, acodec, id);
495  } else if (!strcmp(key, "audiosamplerate") && acodec) {
496  acodec->sample_rate = num_val;
497  } else if (!strcmp(key, "audiosamplesize") && acodec) {
498  acodec->bits_per_coded_sample = num_val;
499  } else if (!strcmp(key, "stereo") && acodec) {
500  acodec->channels = num_val + 1;
501  acodec->channel_layout = acodec->channels == 2 ?
504  } else if (!strcmp(key, "width") && vcodec) {
505  vcodec->width = num_val;
506  } else if (!strcmp(key, "height") && vcodec) {
507  vcodec->height = num_val;
508  }
509  }
510  }
511  }
512 
513  if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
514  ((!acodec && !strcmp(key, "audiocodecid")) ||
515  (!vcodec && !strcmp(key, "videocodecid"))))
516  s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
517 
518  if (!strcmp(key, "duration") ||
519  !strcmp(key, "filesize") ||
520  !strcmp(key, "width") ||
521  !strcmp(key, "height") ||
522  !strcmp(key, "videodatarate") ||
523  !strcmp(key, "framerate") ||
524  !strcmp(key, "videocodecid") ||
525  !strcmp(key, "audiodatarate") ||
526  !strcmp(key, "audiosamplerate") ||
527  !strcmp(key, "audiosamplesize") ||
528  !strcmp(key, "stereo") ||
529  !strcmp(key, "audiocodecid") ||
530  !strcmp(key, "datastream"))
531  return 0;
532 
534  if (amf_type == AMF_DATA_TYPE_BOOL) {
535  av_strlcpy(str_val, num_val > 0 ? "true" : "false",
536  sizeof(str_val));
537  av_dict_set(&s->metadata, key, str_val, 0);
538  } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
539  snprintf(str_val, sizeof(str_val), "%.f", num_val);
540  av_dict_set(&s->metadata, key, str_val, 0);
541  } else if (amf_type == AMF_DATA_TYPE_STRING)
542  av_dict_set(&s->metadata, key, str_val, 0);
543  }
544 
545  return 0;
546 }
547 
548 #define TYPE_ONTEXTDATA 1
549 #define TYPE_ONCAPTION 2
550 #define TYPE_ONCAPTIONINFO 3
551 #define TYPE_UNKNOWN 9
552 
553 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
554 {
556  AVStream *stream, *astream, *vstream;
557  AVStream av_unused *dstream;
558  AVIOContext *ioc;
559  int i;
560  // only needs to hold the string "onMetaData".
561  // Anything longer is something we don't want.
562  char buffer[32];
563 
564  astream = NULL;
565  vstream = NULL;
566  dstream = NULL;
567  ioc = s->pb;
568 
569  // first object needs to be "onMetaData" string
570  type = avio_r8(ioc);
571  if (type != AMF_DATA_TYPE_STRING ||
572  amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
573  return TYPE_UNKNOWN;
574 
575  if (!strcmp(buffer, "onTextData"))
576  return TYPE_ONTEXTDATA;
577 
578  if (!strcmp(buffer, "onCaption"))
579  return TYPE_ONCAPTION;
580 
581  if (!strcmp(buffer, "onCaptionInfo"))
582  return TYPE_ONCAPTIONINFO;
583 
584  if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint")) {
585  av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
586  return TYPE_UNKNOWN;
587  }
588 
589  // find the streams now so that amf_parse_object doesn't need to do
590  // the lookup every time it is called.
591  for (i = 0; i < s->nb_streams; i++) {
592  stream = s->streams[i];
593  if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO)
594  vstream = stream;
595  else if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO)
596  astream = stream;
597  else if (stream->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
598  dstream = stream;
599  }
600 
601  // parse the second object (we want a mixed array)
602  if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
603  return -1;
604 
605  return 0;
606 }
607 
609 {
610  int offset, flags;
611 
612  avio_skip(s->pb, 4);
613  flags = avio_r8(s->pb);
614 
616 
617  if (flags & FLV_HEADER_FLAG_HASVIDEO)
619  return AVERROR(ENOMEM);
620  if (flags & FLV_HEADER_FLAG_HASAUDIO)
622  return AVERROR(ENOMEM);
623  // Flag doesn't indicate whether or not there is script-data present. Must
624  // create that stream if it's encountered.
625 
626  offset = avio_rb32(s->pb);
627  avio_seek(s->pb, offset, SEEK_SET);
628  avio_skip(s->pb, 4);
629 
630  s->start_time = 0;
631 
632  return 0;
633 }
634 
636 {
637  int i;
638  FLVContext *flv = s->priv_data;
639  for (i=0; i<FLV_STREAM_TYPE_NB; i++)
640  av_freep(&flv->new_extradata[i]);
641  return 0;
642 }
643 
645 {
646  av_freep(&st->codec->extradata);
647  if (ff_get_extradata(st->codec, s->pb, size) < 0)
648  return AVERROR(ENOMEM);
649  return 0;
650 }
651 
652 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
653  int size)
654 {
655  av_free(flv->new_extradata[stream]);
656  flv->new_extradata[stream] = av_mallocz(size +
658  if (!flv->new_extradata[stream])
659  return AVERROR(ENOMEM);
660  flv->new_extradata_size[stream] = size;
661  avio_read(pb, flv->new_extradata[stream], size);
662  return 0;
663 }
664 
665 static void clear_index_entries(AVFormatContext *s, int64_t pos)
666 {
667  int i, j, out;
669  "Found invalid index entries, clearing the index.\n");
670  for (i = 0; i < s->nb_streams; i++) {
671  AVStream *st = s->streams[i];
672  /* Remove all index entries that point to >= pos */
673  out = 0;
674  for (j = 0; j < st->nb_index_entries; j++)
675  if (st->index_entries[j].pos < pos)
676  st->index_entries[out++] = st->index_entries[j];
677  st->nb_index_entries = out;
678  }
679 }
680 
682 {
683  int nb = -1, ret, parse_name = 1;
684 
685  switch (type) {
687  avio_skip(pb, 8);
688  break;
689  case AMF_DATA_TYPE_BOOL:
690  avio_skip(pb, 1);
691  break;
693  avio_skip(pb, avio_rb16(pb));
694  break;
695  case AMF_DATA_TYPE_ARRAY:
696  parse_name = 0;
698  nb = avio_rb32(pb);
700  while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
701  if (parse_name) {
702  int size = avio_rb16(pb);
703  if (!size) {
704  avio_skip(pb, 1);
705  break;
706  }
707  avio_skip(pb, size);
708  }
709  if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0)
710  return ret;
711  }
712  break;
713  case AMF_DATA_TYPE_NULL:
715  break;
716  default:
717  return AVERROR_INVALIDDATA;
718  }
719  return 0;
720 }
721 
723  int64_t dts, int64_t next)
724 {
725  AVIOContext *pb = s->pb;
726  AVStream *st = NULL;
727  char buf[20];
728  int ret = AVERROR_INVALIDDATA;
729  int i, length = -1;
730  int array = 0;
731 
732  switch (avio_r8(pb)) {
733  case AMF_DATA_TYPE_ARRAY:
734  array = 1;
736  avio_seek(pb, 4, SEEK_CUR);
738  break;
739  default:
740  goto skip;
741  }
742 
743  while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
744  AMFDataType type = avio_r8(pb);
745  if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {
746  length = avio_rb16(pb);
747  ret = av_get_packet(pb, pkt, length);
748  if (ret < 0)
749  goto skip;
750  else
751  break;
752  } else {
753  if ((ret = amf_skip_tag(pb, type)) < 0)
754  goto skip;
755  }
756  }
757 
758  if (length < 0) {
759  ret = AVERROR_INVALIDDATA;
760  goto skip;
761  }
762 
763  for (i = 0; i < s->nb_streams; i++) {
764  st = s->streams[i];
766  break;
767  }
768 
769  if (i == s->nb_streams) {
771  if (!st)
772  return AVERROR(ENOMEM);
774  }
775 
776  pkt->dts = dts;
777  pkt->pts = dts;
778  pkt->size = ret;
779 
780  pkt->stream_index = st->index;
781  pkt->flags |= AV_PKT_FLAG_KEY;
782 
783 skip:
784  avio_seek(s->pb, next + 4, SEEK_SET);
785 
786  return ret;
787 }
788 
790 {
791  FLVContext *flv = s->priv_data;
792  int ret, i, size, flags;
793  enum FlvTagType type;
794  int stream_type=-1;
795  int64_t next, pos, meta_pos;
796  int64_t dts, pts = AV_NOPTS_VALUE;
797  int av_uninit(channels);
798  int av_uninit(sample_rate);
799  AVStream *st = NULL;
800 
801  /* pkt size is repeated at end. skip it */
802  for (;; avio_skip(s->pb, 4)) {
803  pos = avio_tell(s->pb);
804  type = (avio_r8(s->pb) & 0x1F);
805  size = avio_rb24(s->pb);
806  dts = avio_rb24(s->pb);
807  dts |= avio_r8(s->pb) << 24;
808  av_log(s, AV_LOG_TRACE, "type:%d, size:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, dts, avio_tell(s->pb));
809  if (avio_feof(s->pb))
810  return AVERROR_EOF;
811  avio_skip(s->pb, 3); /* stream id, always 0 */
812  flags = 0;
813 
814  if (flv->validate_next < flv->validate_count) {
815  int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
816  if (pos == validate_pos) {
817  if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
819  flv->validate_next++;
820  } else {
821  clear_index_entries(s, validate_pos);
822  flv->validate_count = 0;
823  }
824  } else if (pos > validate_pos) {
825  clear_index_entries(s, validate_pos);
826  flv->validate_count = 0;
827  }
828  }
829 
830  if (size == 0)
831  continue;
832 
833  next = size + avio_tell(s->pb);
834 
835  if (type == FLV_TAG_TYPE_AUDIO) {
836  stream_type = FLV_STREAM_TYPE_AUDIO;
837  flags = avio_r8(s->pb);
838  size--;
839  } else if (type == FLV_TAG_TYPE_VIDEO) {
840  stream_type = FLV_STREAM_TYPE_VIDEO;
841  flags = avio_r8(s->pb);
842  size--;
844  goto skip;
845  } else if (type == FLV_TAG_TYPE_META) {
846  stream_type=FLV_STREAM_TYPE_DATA;
847  if (size > 13 + 1 + 4) { // Header-type metadata stuff
848  int type;
849  meta_pos = avio_tell(s->pb);
850  type = flv_read_metabody(s, next);
851  if (type == 0 && dts == 0 || type < 0 || type == TYPE_UNKNOWN) {
852  goto skip;
853  } else if (type == TYPE_ONTEXTDATA) {
854  avpriv_request_sample(s, "OnTextData packet");
855  return flv_data_packet(s, pkt, dts, next);
856  } else if (type == TYPE_ONCAPTION) {
857  return flv_data_packet(s, pkt, dts, next);
858  }
859  avio_seek(s->pb, meta_pos, SEEK_SET);
860  }
861  } else {
862  av_log(s, AV_LOG_DEBUG,
863  "Skipping flv packet: type %d, size %d, flags %d.\n",
864  type, size, flags);
865 skip:
866  avio_seek(s->pb, next, SEEK_SET);
867  continue;
868  }
869 
870  /* skip empty data packets */
871  if (!size)
872  continue;
873 
874  /* now find stream */
875  for (i = 0; i < s->nb_streams; i++) {
876  st = s->streams[i];
877  if (stream_type == FLV_STREAM_TYPE_AUDIO) {
878  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
879  (s->audio_codec_id || flv_same_audio_codec(st->codec, flags)))
880  break;
881  } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
882  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
883  (s->video_codec_id || flv_same_video_codec(st->codec, flags)))
884  break;
885  } else if (stream_type == FLV_STREAM_TYPE_DATA) {
887  break;
888  }
889  }
890  if (i == s->nb_streams) {
891  static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};
892  av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n");
893  st = create_stream(s, stream_types[stream_type]);
894  if (!st)
895  return AVERROR(ENOMEM);
896 
897  }
898  av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);
899 
900  if (s->pb->seekable &&
901  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
902  stream_type == FLV_STREAM_TYPE_AUDIO))
903  av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
904 
905  if ( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))
906  ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))
907  || st->discard >= AVDISCARD_ALL
908  ) {
909  avio_seek(s->pb, next, SEEK_SET);
910  continue;
911  }
912  break;
913  }
914 
915  // if not streamed and no duration from metadata then seek to end to find
916  // the duration from the timestamps
917  if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE) && !flv->searched_for_end) {
918  int size;
919  const int64_t pos = avio_tell(s->pb);
920  // Read the last 4 bytes of the file, this should be the size of the
921  // previous FLV tag. Use the timestamp of its payload as duration.
922  int64_t fsize = avio_size(s->pb);
923 retry_duration:
924  avio_seek(s->pb, fsize - 4, SEEK_SET);
925  size = avio_rb32(s->pb);
926  // Seek to the start of the last FLV tag at position (fsize - 4 - size)
927  // but skip the byte indicating the type.
928  avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
929  if (size == avio_rb24(s->pb) + 11) {
930  uint32_t ts = avio_rb24(s->pb);
931  ts |= avio_r8(s->pb) << 24;
932  if (ts)
933  s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
934  else if (fsize >= 8 && fsize - 8 >= size) {
935  fsize -= size+4;
936  goto retry_duration;
937  }
938  }
939 
940  avio_seek(s->pb, pos, SEEK_SET);
941  flv->searched_for_end = 1;
942  }
943 
944  if (stream_type == FLV_STREAM_TYPE_AUDIO) {
945  int bits_per_coded_sample;
946  channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
947  sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
949  bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
950  if (!st->codec->channels || !st->codec->sample_rate ||
952  st->codec->channels = channels;
953  st->codec->channel_layout = channels == 1
957  st->codec->bits_per_coded_sample = bits_per_coded_sample;
958  }
959  if (!st->codec->codec_id) {
960  flv_set_audio_codec(s, st, st->codec,
961  flags & FLV_AUDIO_CODECID_MASK);
962  flv->last_sample_rate =
964  flv->last_channels =
965  channels = st->codec->channels;
966  } else {
967  AVCodecContext ctx = {0};
968  ctx.sample_rate = sample_rate;
969  ctx.bits_per_coded_sample = bits_per_coded_sample;
970  flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);
971  sample_rate = ctx.sample_rate;
972  }
973  } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
974  size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
975  } else if (stream_type == FLV_STREAM_TYPE_DATA) {
977  }
978 
979  if (st->codec->codec_id == AV_CODEC_ID_AAC ||
980  st->codec->codec_id == AV_CODEC_ID_H264 ||
981  st->codec->codec_id == AV_CODEC_ID_MPEG4) {
982  int type = avio_r8(s->pb);
983  size--;
985  // sign extension
986  int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
987  pts = dts + cts;
988  if (cts < 0) { // dts might be wrong
989  if (!flv->wrong_dts)
991  "Negative cts, previous timestamps might be wrong.\n");
992  flv->wrong_dts = 1;
993  } else if (FFABS(dts - pts) > 1000*60*15) {
995  "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
996  dts = pts = AV_NOPTS_VALUE;
997  }
998  }
999  if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC ||
1000  st->codec->codec_id == AV_CODEC_ID_H264)) {
1001  AVDictionaryEntry *t;
1002 
1003  if (st->codec->extradata) {
1004  if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
1005  return ret;
1006  ret = AVERROR(EAGAIN);
1007  goto leave;
1008  }
1009  if ((ret = flv_get_extradata(s, st, size)) < 0)
1010  return ret;
1011 
1012  /* Workaround for buggy Omnia A/XE encoder */
1013  t = av_dict_get(s->metadata, "Encoder", NULL, 0);
1014  if (st->codec->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
1015  st->codec->extradata_size = 2;
1016 
1017  if (st->codec->codec_id == AV_CODEC_ID_AAC && 0) {
1018  MPEG4AudioConfig cfg;
1019 
1021  st->codec->extradata_size * 8, 1) >= 0) {
1022  st->codec->channels = cfg.channels;
1023  st->codec->channel_layout = 0;
1024  if (cfg.ext_sample_rate)
1025  st->codec->sample_rate = cfg.ext_sample_rate;
1026  else
1027  st->codec->sample_rate = cfg.sample_rate;
1028  av_log(s, AV_LOG_TRACE, "mp4a config channels %d sample rate %d\n",
1029  st->codec->channels, st->codec->sample_rate);
1030  }
1031  }
1032 
1033  ret = AVERROR(EAGAIN);
1034  goto leave;
1035  }
1036  }
1037 
1038  /* skip empty data packets */
1039  if (!size) {
1040  ret = AVERROR(EAGAIN);
1041  goto leave;
1042  }
1043 
1044  ret = av_get_packet(s->pb, pkt, size);
1045  if (ret < 0)
1046  return ret;
1047  pkt->dts = dts;
1048  pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
1049  pkt->stream_index = st->index;
1050  if (flv->new_extradata[stream_type]) {
1052  flv->new_extradata_size[stream_type]);
1053  if (side) {
1054  memcpy(side, flv->new_extradata[stream_type],
1055  flv->new_extradata_size[stream_type]);
1056  av_freep(&flv->new_extradata[stream_type]);
1057  flv->new_extradata_size[stream_type] = 0;
1058  }
1059  }
1060  if (stream_type == FLV_STREAM_TYPE_AUDIO &&
1061  (sample_rate != flv->last_sample_rate ||
1062  channels != flv->last_channels)) {
1064  flv->last_channels = channels;
1065  ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
1066  }
1067 
1068  if ( stream_type == FLV_STREAM_TYPE_AUDIO ||
1069  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||
1070  stream_type == FLV_STREAM_TYPE_DATA)
1071  pkt->flags |= AV_PKT_FLAG_KEY;
1072 
1073 leave:
1074  avio_skip(s->pb, 4);
1075  return ret;
1076 }
1077 
1078 static int flv_read_seek(AVFormatContext *s, int stream_index,
1079  int64_t ts, int flags)
1080 {
1081  FLVContext *flv = s->priv_data;
1082  flv->validate_count = 0;
1083  return avio_seek_time(s->pb, stream_index, ts, flags);
1084 }
1085 
1086 #define OFFSET(x) offsetof(FLVContext, x)
1087 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1088 static const AVOption options[] = {
1089  { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1090  { NULL }
1091 };
1092 
1093 static const AVClass flv_class = {
1094  .class_name = "flvdec",
1095  .item_name = av_default_item_name,
1096  .option = options,
1097  .version = LIBAVUTIL_VERSION_INT,
1098 };
1099 
1101  .name = "flv",
1102  .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1103  .priv_data_size = sizeof(FLVContext),
1104  .read_probe = flv_probe,
1109  .extensions = "flv",
1110  .priv_class = &flv_class,
1111 };
1112 
1113 static const AVClass live_flv_class = {
1114  .class_name = "live_flvdec",
1115  .item_name = av_default_item_name,
1116  .option = options,
1117  .version = LIBAVUTIL_VERSION_INT,
1118 };
1119 
1121  .name = "live_flv",
1122  .long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
1123  .priv_data_size = sizeof(FLVContext),
1129  .extensions = "flv",
1130  .priv_class = &live_flv_class,
1132 };
key frame (for AVC, a seekable frame)
Definition: flv.h:115
#define NULL
Definition: coverity.c:32
discard all frames except keyframes
Definition: avcodec.h:688
#define TYPE_ONCAPTIONINFO
Definition: flvdec.c:550
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:282
AVOption.
Definition: opt.h:255
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:1745
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
static void clear_index_entries(AVFormatContext *s, int64_t pos)
Definition: flvdec.c:665
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4083
int64_t pos
Definition: avformat.h:784
int ff_get_extradata(AVCodecContext *avctx, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:2945
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
#define TYPE_ONCAPTION
Definition: flvdec.c:549
#define KEYFRAMES_TIMESTAMP_TAG
Definition: flv.h:50
int index
stream index in AVFormatContext
Definition: avformat.h:843
int size
Definition: avcodec.h:1424
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:204
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1045
static int flv_data_packet(AVFormatContext *s, AVPacket *pkt, int64_t dts, int64_t next)
Definition: flvdec.c:722
int searched_for_end
Definition: flvdec.c:56
struct FLVContext::@164 validate_index[2]
enum AVMediaType codec_type
Definition: rtp.c:37
int event_flags
Flags for the user to detect events happening on the file.
Definition: avformat.h:1560
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:277
discard all
Definition: avcodec.h:689
static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos)
Definition: flvdec.c:301
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: flvdec.c:789
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:675
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1322
#define OFFSET(x)
Definition: flvdec.c:1086
static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: flvdec.c:1078
Format I/O context.
Definition: avformat.h:1273
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1386
Public dictionary API.
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define TYPE_ONTEXTDATA
Definition: flvdec.c:548
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
int validate_next
Definition: flvdec.c:54
#define VD
Definition: flvdec.c:1087
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1232
AVOptions.
#define FLV_AUDIO_CODECID_MASK
Definition: flv.h:42
int64_t pos
Definition: flvdec.c:52
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:690
int wrong_dts
wrong dts due to negative cts
Definition: flvdec.c:45
enum AVStreamParseType need_parsing
Definition: avformat.h:1034
static const AVOption options[]
Definition: flvdec.c:1088
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1617
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3749
#define FLV_VIDEO_CODECID_MASK
Definition: flv.h:44
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1341
#define VALIDATE_INDEX_TS_THRESH
Definition: flvdec.c:40
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:39
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1384
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define FLV_AUDIO_SAMPLERATE_OFFSET
Definition: flv.h:33
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
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:244
AMFDataType
Definition: flv.h:122
ptrdiff_t size
Definition: opengl_enc.c:101
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:757
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
int trust_metadata
configure streams according onMetaData
Definition: flvdec.c:44
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2996
int validate_count
Definition: flvdec.c:55
#define FLV_AUDIO_SAMPLERATE_MASK
Definition: flv.h:41
enum AVCodecID video_codec_id
Forced video codec_id.
Definition: avformat.h:1431
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:538
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1469
#define AVINDEX_KEYFRAME
Definition: avformat.h:791
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1485
#define TYPE_UNKNOWN
Definition: flvdec.c:551
static int live_flv_probe(AVProbeData *p)
Definition: flvdec.c:83
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:474
av_default_item_name
discard all bidirectional frames
Definition: avcodec.h:686
#define AVERROR(e)
Definition: error.h:43
static int flv_read_close(AVFormatContext *s)
Definition: flvdec.c:635
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
static int flv_read_header(AVFormatContext *s)
Definition: flvdec.c:608
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:425
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:4223
static AVStream * create_stream(AVFormatContext *s, int codec_type)
Definition: flvdec.c:88
GLsizei GLsizei * length
Definition: opengl_enc.c:115
enum AVCodecID codec_id
Definition: mov_chan.c:433
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
uint8_t * new_extradata[FLV_STREAM_TYPE_NB]
Definition: flvdec.c:46
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:83
int depth
Definition: v4l.c:62
static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid, int read)
Definition: flvdec.c:239
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1429
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2323
int64_t dts
Definition: flvdec.c:51
Only parse headers, do not repack.
Definition: avformat.h:775
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:529
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1329
#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:160
int bit_rate
the average bitrate
Definition: avcodec.h:1567
audio channel layout utility functions
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:683
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:246
enum AVCodecID audio_codec_id
Forced audio codec_id.
Definition: avformat.h:1437
static int flv_same_video_codec(AVCodecContext *vcodec, int flags)
Definition: flvdec.c:214
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int width
picture width / height.
Definition: avcodec.h:1681
int new_extradata_size[FLV_STREAM_TYPE_NB]
Definition: flvdec.c:47
int32_t
#define AVFMT_EVENT_FLAG_METADATA_UPDATED
The call resulted in updated metadata.
Definition: avformat.h:1561
#define FFABS(a)
Definition: common.h:61
static int flv_probe(AVProbeData *p)
Definition: flvdec.c:78
static const AVClass flv_class
Definition: flvdec.c:1093
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, AVCodecContext *acodec, int flv_codecid)
Definition: flvdec.c:154
#define KEYFRAMES_TAG
Definition: flv.h:49
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
static int flv_same_audio_codec(AVCodecContext *acodec, int flags)
Definition: flvdec.c:103
Stream structure.
Definition: avformat.h:842
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static const AVClass live_flv_class
Definition: flvdec.c:1113
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
Definition: flvdec.c:553
sample_rate
FLV common header.
enum AVMediaType codec_type
Definition: avcodec.h:1510
enum AVCodecID codec_id
Definition: avcodec.h:1519
int sample_rate
samples per second
Definition: avcodec.h:2262
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
main external API structure.
Definition: avcodec.h:1502
static int probe(AVProbeData *p, int live)
Definition: flvdec.c:59
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1534
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2924
void * buf
Definition: avisynth_c.h:553
GLint GLenum type
Definition: opengl_enc.c:105
int extradata_size
Definition: avcodec.h:1618
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:69
int last_sample_rate
Definition: flvdec.c:48
int nb_index_entries
Definition: avformat.h:1047
Describe the class of an AVClass context structure.
Definition: log.h:67
int last_channels
Definition: flvdec.c:49
static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream, int size)
Definition: flvdec.c:652
AVMediaType
Definition: avutil.h:191
#define snprintf
Definition: snprintf.h:34
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
#define FLV_AUDIO_CHANNEL_MASK
Definition: flv.h:39
#define FLV_AUDIO_SAMPLESIZE_MASK
Definition: flv.h:40
#define AMF_END_OF_OBJECT
Definition: flv.h:47
#define KEYFRAMES_BYTEOFFSET_TAG
Definition: flv.h:51
static int64_t pts
Global timestamp for the audio frames.
static int flags
Definition: cpu.c:47
int64_t start_time
Position of the first frame of the component, in AV_TIME_BASE fractional seconds. ...
Definition: avformat.h:1358
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
full parsing and repack
Definition: avformat.h:774
Main libavformat public API header.
static void finish(void)
Definition: ffhash.c:62
raw UTF-8 text
Definition: avcodec.h:512
#define FLV_VIDEO_FRAMETYPE_MASK
Definition: flv.h:45
static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
Definition: flvdec.c:286
AVInputFormat ff_live_flv_demuxer
Definition: flvdec.c:1120
static const int32_t max_pos[4]
Size of the MP-MLQ fixed excitation codebooks.
Definition: g723_1_data.h:613
AVInputFormat ff_flv_demuxer
Definition: flvdec.c:1100
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:81
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:636
static int amf_skip_tag(AVIOContext *pb, AMFDataType type)
Definition: flvdec.c:681
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:986
FlvTagType
Definition: flv.h:59
#define av_free(p)
char * value
Definition: dict.h:88
int eof_reached
true if eof reached
Definition: avio.h:139
static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth)
Definition: flvdec.c:385
int channels
number of audio channels
Definition: avcodec.h:2263
void * priv_data
Format private data.
Definition: avformat.h:1301
video info/command frame
Definition: flv.h:119
disposable inter frame (H.263 only)
Definition: flv.h:117
Definition: flv.h:74
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
#define av_uninit(x)
Definition: attributes.h:141
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1422
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
Definition: flvdec.c:644
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1368
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:301
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:299
int stream_index
Definition: avcodec.h:1425
#define AV_CH_LAYOUT_MONO
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:907
This structure stores compressed data.
Definition: avcodec.h:1400
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:252
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1416
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
GLuint buffer
Definition: opengl_enc.c:102
#define av_unused
Definition: attributes.h:118