FFmpeg
oggdec.c
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1 /*
2  * Ogg bitstream support
3  * Luca Barbato <lu_zero@gentoo.org>
4  * Based on tcvp implementation
5  */
6 
7 /*
8  Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
9 
10  Permission is hereby granted, free of charge, to any person
11  obtaining a copy of this software and associated documentation
12  files (the "Software"), to deal in the Software without
13  restriction, including without limitation the rights to use, copy,
14  modify, merge, publish, distribute, sublicense, and/or sell copies
15  of the Software, and to permit persons to whom the Software is
16  furnished to do so, subject to the following conditions:
17 
18  The above copyright notice and this permission notice shall be
19  included in all copies or substantial portions of the Software.
20 
21  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
28  DEALINGS IN THE SOFTWARE.
29  */
30 
31 #include <stdio.h>
32 #include "libavutil/avassert.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/mem.h"
35 #include "avio_internal.h"
36 #include "demux.h"
37 #include "oggdec.h"
38 #include "avformat.h"
39 #include "internal.h"
40 
41 #define MAX_PAGE_SIZE 65307
42 #define DECODER_BUFFER_SIZE MAX_PAGE_SIZE
43 
44 static const struct ogg_codec * const ogg_codecs[] = {
53  &ff_vp8_codec,
60  NULL
61 };
62 
63 static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts);
64 static int ogg_new_stream(AVFormatContext *s, uint32_t serial);
65 static int ogg_restore(AVFormatContext *s);
66 
67 static void free_stream(AVFormatContext *s, int i)
68 {
69  struct ogg *ogg = s->priv_data;
70  struct ogg_stream *stream = &ogg->streams[i];
71 
72  av_freep(&stream->buf);
73  if (stream->codec &&
74  stream->codec->cleanup) {
75  stream->codec->cleanup(s, i);
76  }
77 
78  av_freep(&stream->private);
79  av_freep(&stream->new_metadata);
80 }
81 
82 //FIXME We could avoid some structure duplication
84 {
85  struct ogg *ogg = s->priv_data;
86  struct ogg_state *ost =
87  av_malloc(sizeof(*ost) + (ogg->nstreams - 1) * sizeof(*ogg->streams));
88  int i;
89  int ret = 0;
90 
91  if (!ost)
92  return AVERROR(ENOMEM);
93 
94  ost->pos = avio_tell(s->pb);
95  ost->curidx = ogg->curidx;
96  ost->next = ogg->state;
97  ost->nstreams = ogg->nstreams;
98  memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
99 
100  for (i = 0; i < ogg->nstreams; i++) {
101  struct ogg_stream *os = ogg->streams + i;
103  if (os->buf)
104  memcpy(os->buf, ost->streams[i].buf, os->bufpos);
105  else
106  ret = AVERROR(ENOMEM);
107  os->new_metadata = NULL;
108  os->new_metadata_size = 0;
109  }
110 
111  ogg->state = ost;
112 
113  if (ret < 0)
114  ogg_restore(s);
115 
116  return ret;
117 }
118 
120 {
121  struct ogg *ogg = s->priv_data;
122  AVIOContext *bc = s->pb;
123  struct ogg_state *ost = ogg->state;
124  int i, err;
125 
126  if (!ost)
127  return 0;
128 
129  ogg->state = ost->next;
130 
131  for (i = 0; i < ogg->nstreams; i++) {
132  struct ogg_stream *stream = &ogg->streams[i];
133  av_freep(&stream->buf);
134  av_freep(&stream->new_metadata);
135 
136  if (i >= ost->nstreams || !ost->streams[i].private) {
137  free_stream(s, i);
138  }
139  }
140 
141  avio_seek(bc, ost->pos, SEEK_SET);
142  ogg->page_pos = -1;
143  ogg->curidx = ost->curidx;
144  ogg->nstreams = ost->nstreams;
145  if ((err = av_reallocp_array(&ogg->streams, ogg->nstreams,
146  sizeof(*ogg->streams))) < 0) {
147  ogg->nstreams = 0;
148  return err;
149  } else
150  memcpy(ogg->streams, ost->streams,
151  ost->nstreams * sizeof(*ogg->streams));
152 
153  av_free(ost);
154 
155  return 0;
156 }
157 
159 {
160  struct ogg *ogg = s->priv_data;
161  int i;
162  int64_t start_pos = avio_tell(s->pb);
163 
164  for (i = 0; i < ogg->nstreams; i++) {
165  struct ogg_stream *os = ogg->streams + i;
166  os->bufpos = 0;
167  os->pstart = 0;
168  os->psize = 0;
169  os->granule = -1;
170  os->lastpts = AV_NOPTS_VALUE;
171  os->lastdts = AV_NOPTS_VALUE;
172  os->sync_pos = -1;
173  os->page_pos = 0;
174  os->nsegs = 0;
175  os->segp = 0;
176  os->incomplete = 0;
177  os->got_data = 0;
178  if (start_pos <= ffformatcontext(s)->data_offset) {
179  os->lastpts = 0;
180  }
181  os->start_trimming = 0;
182  os->end_trimming = 0;
183  av_freep(&os->new_metadata);
184  os->new_metadata_size = 0;
185  }
186 
187  ogg->page_pos = -1;
188  ogg->curidx = -1;
189 
190  return 0;
191 }
192 
193 static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
194 {
195  int i;
196 
197  for (i = 0; ogg_codecs[i]; i++)
198  if (size >= ogg_codecs[i]->magicsize &&
199  !memcmp(buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
200  return ogg_codecs[i];
201 
202  return NULL;
203 }
204 
205 /**
206  * Replace the current stream with a new one. This is a typical webradio
207  * situation where a new audio stream spawn (identified with a new serial) and
208  * must replace the previous one (track switch).
209  */
210 static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, char *magic, int page_size,
211  int probing)
212 {
213  struct ogg *ogg = s->priv_data;
214  struct ogg_stream *os;
215  const struct ogg_codec *codec;
216  int i = 0;
217 
218  if (ogg->nstreams != 1) {
219  avpriv_report_missing_feature(s, "Changing stream parameters in multistream ogg");
220  return AVERROR_PATCHWELCOME;
221  }
222 
223  /* Check for codecs */
224  codec = ogg_find_codec(magic, page_size);
225  if (!codec && !probing) {
226  av_log(s, AV_LOG_ERROR, "Cannot identify new stream\n");
227  return AVERROR_INVALIDDATA;
228  }
229 
230  os = &ogg->streams[0];
231  if (os->codec != codec)
232  return AVERROR(EINVAL);
233 
234  os->serial = serial;
235  os->codec = codec;
236  os->serial = serial;
237  os->lastpts = 0;
238  os->lastdts = 0;
239  os->start_trimming = 0;
240  os->end_trimming = 0;
241 
242  /* Chained files have extradata as a new packet */
243  if (codec == &ff_opus_codec)
244  os->header = -1;
245 
246  return i;
247 }
248 
249 static int ogg_new_stream(AVFormatContext *s, uint32_t serial)
250 {
251  struct ogg *ogg = s->priv_data;
252  int idx = ogg->nstreams;
253  AVStream *st;
254  struct ogg_stream *os;
255 
256  if (ogg->state) {
257  av_log(s, AV_LOG_ERROR, "New streams are not supposed to be added "
258  "in between Ogg context save/restore operations.\n");
259  return AVERROR_BUG;
260  }
261 
262  /* Allocate and init a new Ogg Stream */
263  if (!(os = av_realloc_array(ogg->streams, ogg->nstreams + 1,
264  sizeof(*ogg->streams))))
265  return AVERROR(ENOMEM);
266  ogg->streams = os;
267  os = ogg->streams + idx;
268  memset(os, 0, sizeof(*os));
269  os->serial = serial;
272  os->header = -1;
274  if (!os->buf)
275  return AVERROR(ENOMEM);
276 
277  /* Create the associated AVStream */
278  st = avformat_new_stream(s, NULL);
279  if (!st) {
280  av_freep(&os->buf);
281  return AVERROR(ENOMEM);
282  }
283  st->id = idx;
284  avpriv_set_pts_info(st, 64, 1, 1000000);
285 
286  ogg->nstreams++;
287  return idx;
288 }
289 
290 static int data_packets_seen(const struct ogg *ogg)
291 {
292  int i;
293 
294  for (i = 0; i < ogg->nstreams; i++)
295  if (ogg->streams[i].got_data)
296  return 1;
297  return 0;
298 }
299 
300 static int buf_realloc(struct ogg_stream *os, int size)
301 {
302  /* Even if invalid guarantee there's enough memory to read the page */
303  if (os->bufsize - os->bufpos < size) {
304  uint8_t *nb = av_realloc(os->buf, 2*os->bufsize + AV_INPUT_BUFFER_PADDING_SIZE);
305  if (!nb)
306  return AVERROR(ENOMEM);
307  os->buf = nb;
308  os->bufsize *= 2;
309  }
310 
311  return 0;
312 }
313 
314 static int ogg_read_page(AVFormatContext *s, int *sid, int probing)
315 {
316  AVIOContext *bc = s->pb;
317  struct ogg *ogg = s->priv_data;
318  struct ogg_stream *os;
319  int ret, i = 0;
320  int flags, nsegs;
321  uint64_t gp;
322  uint32_t serial;
323  uint32_t crc, crc_tmp;
324  int size = 0, idx;
326  int64_t start_pos;
327  uint8_t sync[4];
328  uint8_t segments[255];
329  uint8_t *readout_buf;
330  int sp = 0;
331 
332  ret = avio_read(bc, sync, 4);
333  if (ret < 4)
334  return ret < 0 ? ret : AVERROR_EOF;
335 
336  do {
337  int c;
338 
339  if (sync[sp & 3] == 'O' &&
340  sync[(sp + 1) & 3] == 'g' &&
341  sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
342  break;
343 
344  if(!i && (bc->seekable & AVIO_SEEKABLE_NORMAL) && ogg->page_pos > 0) {
345  memset(sync, 0, 4);
346  avio_seek(bc, ogg->page_pos+4, SEEK_SET);
347  ogg->page_pos = -1;
348  }
349 
350  c = avio_r8(bc);
351 
352  if (avio_feof(bc))
353  return AVERROR_EOF;
354 
355  sync[sp++ & 3] = c;
356  } while (i++ < MAX_PAGE_SIZE);
357 
358  if (i >= MAX_PAGE_SIZE) {
359  av_log(s, AV_LOG_INFO, "cannot find sync word\n");
360  return AVERROR_INVALIDDATA;
361  }
362 
363  /* 0x4fa9b05f = av_crc(AV_CRC_32_IEEE, 0x0, "OggS", 4) */
364  ffio_init_checksum(bc, ff_crc04C11DB7_update, 0x4fa9b05f);
365 
366  /* To rewind if checksum is bad/check magic on switches - this is the max packet size */
368  if (ret < 0)
369  return ret;
370  start_pos = avio_tell(bc);
371 
372  version = avio_r8(bc);
373  flags = avio_r8(bc);
374  gp = avio_rl64(bc);
375  serial = avio_rl32(bc);
376  avio_skip(bc, 4); /* seq */
377 
378  crc_tmp = ffio_get_checksum(bc);
379  crc = avio_rb32(bc);
380  crc_tmp = ff_crc04C11DB7_update(crc_tmp, (uint8_t[4]){0}, 4);
382 
383  nsegs = avio_r8(bc);
384  page_pos = avio_tell(bc) - 27;
385 
386  ret = avio_read(bc, segments, nsegs);
387  if (ret < nsegs)
388  return ret < 0 ? ret : AVERROR_EOF;
389 
390  for (i = 0; i < nsegs; i++)
391  size += segments[i];
392 
393  idx = ogg_find_stream(ogg, serial);
394  if (idx >= 0) {
395  os = ogg->streams + idx;
396 
397  ret = buf_realloc(os, size);
398  if (ret < 0)
399  return ret;
400 
401  readout_buf = os->buf + os->bufpos;
402  } else {
403  readout_buf = av_malloc(size);
404  }
405 
406  ret = avio_read(bc, readout_buf, size);
407  if (ret < size) {
408  if (idx < 0)
409  av_free(readout_buf);
410  return ret < 0 ? ret : AVERROR_EOF;
411  }
412 
413  if (crc ^ ffio_get_checksum(bc)) {
414  av_log(s, AV_LOG_ERROR, "CRC mismatch!\n");
415  if (idx < 0)
416  av_free(readout_buf);
417  avio_seek(bc, start_pos, SEEK_SET);
418  *sid = -1;
419  return 0;
420  }
421 
422  /* Since we're almost sure its a valid packet, checking the version after
423  * the checksum lets the demuxer be more tolerant */
424  if (version) {
425  av_log(s, AV_LOG_ERROR, "Invalid Ogg vers!\n");
426  if (idx < 0)
427  av_free(readout_buf);
428  avio_seek(bc, start_pos, SEEK_SET);
429  *sid = -1;
430  return 0;
431  }
432 
433  /* CRC is correct so we can be 99% sure there's an actual change here */
434  if (idx < 0) {
435  if (data_packets_seen(ogg))
436  idx = ogg_replace_stream(s, serial, readout_buf, size, probing);
437  else
438  idx = ogg_new_stream(s, serial);
439 
440  if (idx < 0) {
441  av_log(s, AV_LOG_ERROR, "failed to create or replace stream\n");
442  av_free(readout_buf);
443  return idx;
444  }
445 
446  os = ogg->streams + idx;
447 
448  ret = buf_realloc(os, size);
449  if (ret < 0) {
450  av_free(readout_buf);
451  return ret;
452  }
453 
454  memcpy(os->buf + os->bufpos, readout_buf, size);
455  av_free(readout_buf);
456  }
457 
458  ogg->page_pos = page_pos;
459  os->page_pos = page_pos;
460  os->nsegs = nsegs;
461  os->segp = 0;
462  os->got_data = !(flags & OGG_FLAG_BOS);
463  os->bufpos += size;
464  os->granule = gp;
465  os->flags = flags;
466  memcpy(os->segments, segments, nsegs);
467  memset(os->buf + os->bufpos, 0, AV_INPUT_BUFFER_PADDING_SIZE);
468 
469  if (flags & OGG_FLAG_CONT || os->incomplete) {
470  if (!os->psize) {
471  // If this is the very first segment we started
472  // playback in the middle of a continuation packet.
473  // Discard it since we missed the start of it.
474  while (os->segp < os->nsegs) {
475  int seg = os->segments[os->segp++];
476  os->pstart += seg;
477  if (seg < 255)
478  break;
479  }
480  os->sync_pos = os->page_pos;
481  }
482  } else {
483  os->psize = 0;
484  os->sync_pos = os->page_pos;
485  }
486 
487  /* This function is always called with sid != NULL */
488  *sid = idx;
489 
490  return 0;
491 }
492 
493 /**
494  * @brief find the next Ogg packet
495  * @param *sid is set to the stream for the packet or -1 if there is
496  * no matching stream, in that case assume all other return
497  * values to be uninitialized.
498  * @return negative value on error or EOF.
499  */
500 static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize,
501  int64_t *fpos)
502 {
503  FFFormatContext *const si = ffformatcontext(s);
504  struct ogg *ogg = s->priv_data;
505  int idx, i, ret;
506  struct ogg_stream *os;
507  int complete = 0;
508  int segp = 0, psize = 0;
509 
510  av_log(s, AV_LOG_TRACE, "ogg_packet: curidx=%i\n", ogg->curidx);
511  if (sid)
512  *sid = -1;
513 
514  do {
515  idx = ogg->curidx;
516 
517  while (idx < 0) {
518  ret = ogg_read_page(s, &idx, 0);
519  if (ret < 0)
520  return ret;
521  }
522 
523  os = ogg->streams + idx;
524 
525  av_log(s, AV_LOG_TRACE, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
526  idx, os->pstart, os->psize, os->segp, os->nsegs);
527 
528  if (!os->codec) {
529  if (os->header < 0) {
530  os->codec = ogg_find_codec(os->buf, os->bufpos);
531  if (!os->codec) {
532  av_log(s, AV_LOG_WARNING, "Codec not found\n");
533  os->header = 0;
534  return 0;
535  }
536  } else {
537  return 0;
538  }
539  }
540 
541  segp = os->segp;
542  psize = os->psize;
543 
544  while (os->segp < os->nsegs) {
545  int ss = os->segments[os->segp++];
546  os->psize += ss;
547  if (ss < 255) {
548  complete = 1;
549  break;
550  }
551  }
552 
553  if (!complete && os->segp == os->nsegs) {
554  ogg->curidx = -1;
555  // Do not set incomplete for empty packets.
556  // Together with the code in ogg_read_page
557  // that discards all continuation of empty packets
558  // we would get an infinite loop.
559  os->incomplete = !!os->psize;
560  }
561  } while (!complete);
562 
563 
564  if (os->granule == -1)
566  "Page at %"PRId64" is missing granule\n",
567  os->page_pos);
568 
569  ogg->curidx = idx;
570  os->incomplete = 0;
571 
572  if (os->header) {
573  if ((ret = os->codec->header(s, idx)) < 0) {
574  av_log(s, AV_LOG_ERROR, "Header processing failed: %s\n", av_err2str(ret));
575  return ret;
576  }
577  os->header = ret;
578  if (!os->header) {
579  os->segp = segp;
580  os->psize = psize;
581 
582  // We have reached the first non-header packet in this stream.
583  // Unfortunately more header packets may still follow for others,
584  // but if we continue with header parsing we may lose data packets.
585  ogg->headers = 1;
586 
587  // Update the header state for all streams and
588  // compute the data_offset.
589  if (!si->data_offset)
590  si->data_offset = os->sync_pos;
591 
592  for (i = 0; i < ogg->nstreams; i++) {
593  struct ogg_stream *cur_os = ogg->streams + i;
594 
595  // if we have a partial non-header packet, its start is
596  // obviously at or after the data start
597  if (cur_os->incomplete)
598  si->data_offset = FFMIN(si->data_offset, cur_os->sync_pos);
599  }
600  } else {
601  os->nb_header++;
602  os->pstart += os->psize;
603  os->psize = 0;
604  }
605  } else {
606  os->pflags = 0;
607  os->pduration = 0;
608 
609  ret = 0;
610  if (os->codec && os->codec->packet) {
611  if ((ret = os->codec->packet(s, idx)) < 0) {
612  av_log(s, AV_LOG_ERROR, "Packet processing failed: %s\n", av_err2str(ret));
613  return ret;
614  }
615  }
616 
617  if (!ret) {
618  if (sid)
619  *sid = idx;
620  if (dstart)
621  *dstart = os->pstart;
622  if (dsize)
623  *dsize = os->psize;
624  if (fpos)
625  *fpos = os->sync_pos;
626  }
627 
628  os->pstart += os->psize;
629  os->psize = 0;
630  if(os->pstart == os->bufpos)
631  os->bufpos = os->pstart = 0;
632  os->sync_pos = os->page_pos;
633  }
634 
635  // determine whether there are more complete packets in this page
636  // if not, the page's granule will apply to this packet
637  os->page_end = 1;
638  for (i = os->segp; i < os->nsegs; i++)
639  if (os->segments[i] < 255) {
640  os->page_end = 0;
641  break;
642  }
643 
644  if (os->segp == os->nsegs)
645  ogg->curidx = -1;
646 
647  return 0;
648 }
649 
651 {
652  struct ogg *ogg = s->priv_data;
653  int i, ret;
654  int64_t size, end;
655  int streams_left=0;
656 
657  if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
658  return 0;
659 
660 // already set
661  if (s->duration != AV_NOPTS_VALUE)
662  return 0;
663 
664  size = avio_size(s->pb);
665  if (size < 0)
666  return 0;
667  end = size > MAX_PAGE_SIZE ? size - MAX_PAGE_SIZE : 0;
668 
669  ret = ogg_save(s);
670  if (ret < 0)
671  return ret;
672  avio_seek(s->pb, end, SEEK_SET);
673  ogg->page_pos = -1;
674 
675  while (!ogg_read_page(s, &i, 1)) {
676  if (i >= 0 && ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
677  ogg->streams[i].codec) {
678  s->streams[i]->duration =
680  if (s->streams[i]->start_time != AV_NOPTS_VALUE) {
681  s->streams[i]->duration -= s->streams[i]->start_time;
682  streams_left-= (ogg->streams[i].got_start==-1);
683  ogg->streams[i].got_start= 1;
684  } else if(!ogg->streams[i].got_start) {
685  ogg->streams[i].got_start= -1;
686  streams_left++;
687  }
688  }
689  }
690 
691  ogg_restore(s);
692 
693  ret = ogg_save(s);
694  if (ret < 0)
695  return ret;
696 
697  avio_seek (s->pb, ffformatcontext(s)->data_offset, SEEK_SET);
698  ogg_reset(s);
699  while (streams_left > 0 && !ogg_packet(s, &i, NULL, NULL, NULL)) {
700  int64_t pts;
701  if (i < 0) continue;
702  pts = ogg_calc_pts(s, i, NULL);
703  if (s->streams[i]->duration == AV_NOPTS_VALUE)
704  continue;
705  if (pts != AV_NOPTS_VALUE && s->streams[i]->start_time == AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
706  s->streams[i]->duration -= pts;
707  ogg->streams[i].got_start= 1;
708  streams_left--;
709  }else if(s->streams[i]->start_time != AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
710  ogg->streams[i].got_start= 1;
711  streams_left--;
712  }
713  }
714  ogg_restore (s);
715 
716  return 0;
717 }
718 
720 {
721  struct ogg *ogg = s->priv_data;
722  int i;
723 
724  for (i = 0; i < ogg->nstreams; i++) {
725  free_stream(s, i);
726  }
727 
728  ogg->nstreams = 0;
729 
730  av_freep(&ogg->streams);
731  return 0;
732 }
733 
735 {
736  struct ogg *ogg = s->priv_data;
737  int ret, i;
738 
739  ogg->curidx = -1;
740 
741  //linear headers seek from start
742  do {
743  ret = ogg_packet(s, NULL, NULL, NULL, NULL);
744  if (ret < 0)
745  return ret;
746  } while (!ogg->headers);
747  av_log(s, AV_LOG_TRACE, "found headers\n");
748 
749  for (i = 0; i < ogg->nstreams; i++) {
750  struct ogg_stream *os = ogg->streams + i;
751 
752  if (ogg->streams[i].header < 0) {
753  av_log(s, AV_LOG_ERROR, "Header parsing failed for stream %d\n", i);
754  ogg->streams[i].codec = NULL;
756  } else if (os->codec && os->nb_header < os->codec->nb_header) {
758  "Headers mismatch for stream %d: "
759  "expected %d received %d.\n",
760  i, os->codec->nb_header, os->nb_header);
761  if (s->error_recognition & AV_EF_EXPLODE)
762  return AVERROR_INVALIDDATA;
763  }
765  os->lastpts = s->streams[i]->start_time =
766  ogg_gptopts(s, i, os->start_granule, NULL);
767  }
768 
769  //linear granulepos seek from end
770  ret = ogg_get_length(s);
771  if (ret < 0)
772  return ret;
773 
774  return 0;
775 }
776 
778 {
779  struct ogg *ogg = s->priv_data;
780  struct ogg_stream *os = ogg->streams + idx;
782 
783  if (dts)
784  *dts = AV_NOPTS_VALUE;
785 
786  if (os->lastpts != AV_NOPTS_VALUE) {
787  pts = os->lastpts;
788  os->lastpts = AV_NOPTS_VALUE;
789  }
790  if (os->lastdts != AV_NOPTS_VALUE) {
791  if (dts)
792  *dts = os->lastdts;
793  os->lastdts = AV_NOPTS_VALUE;
794  }
795  if (os->page_end) {
796  if (os->granule != -1LL) {
797  if (os->codec && os->codec->granule_is_start)
798  pts = ogg_gptopts(s, idx, os->granule, dts);
799  else
800  os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
801  os->granule = -1LL;
802  }
803  }
804  return pts;
805 }
806 
807 static void ogg_validate_keyframe(AVFormatContext *s, int idx, int pstart, int psize)
808 {
809  struct ogg *ogg = s->priv_data;
810  struct ogg_stream *os = ogg->streams + idx;
811  int invalid = 0;
812  if (psize) {
813  switch (s->streams[idx]->codecpar->codec_id) {
814  case AV_CODEC_ID_THEORA:
815  invalid = !!(os->pflags & AV_PKT_FLAG_KEY) != !(os->buf[pstart] & 0x40);
816  break;
817  case AV_CODEC_ID_VP8:
818  invalid = !!(os->pflags & AV_PKT_FLAG_KEY) != !(os->buf[pstart] & 1);
819  }
820  if (invalid) {
821  os->pflags ^= AV_PKT_FLAG_KEY;
822  av_log(s, AV_LOG_WARNING, "Broken file, %skeyframe not correctly marked.\n",
823  (os->pflags & AV_PKT_FLAG_KEY) ? "" : "non-");
824  }
825  }
826 }
827 
829 {
830  struct ogg *ogg;
831  struct ogg_stream *os;
832  int idx, ret;
833  int pstart, psize;
834  int64_t fpos, pts, dts;
835 
836  if (s->io_repositioned) {
837  ogg_reset(s);
838  s->io_repositioned = 0;
839  }
840 
841  //Get an ogg packet
842 retry:
843  do {
844  ret = ogg_packet(s, &idx, &pstart, &psize, &fpos);
845  if (ret < 0)
846  return ret;
847  } while (idx < 0 || !s->streams[idx]);
848 
849  ogg = s->priv_data;
850  os = ogg->streams + idx;
851 
852  // pflags might not be set until after this
853  pts = ogg_calc_pts(s, idx, &dts);
855 
856  if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
857  goto retry;
858  os->keyframe_seek = 0;
859 
860  //Alloc a pkt
862  if (ret < 0)
863  return ret;
864  pkt->stream_index = idx;
865  memcpy(pkt->data, os->buf + pstart, psize);
866 
867  pkt->pts = pts;
868  pkt->dts = dts;
869  pkt->flags = os->pflags;
870  pkt->duration = os->pduration;
871  pkt->pos = fpos;
872 
873  if (os->start_trimming || os->end_trimming) {
874  uint8_t *side_data = av_packet_new_side_data(pkt,
876  10);
877  if(!side_data)
878  return AVERROR(ENOMEM);
879  AV_WL32(side_data + 0, os->start_trimming);
880  AV_WL32(side_data + 4, os->end_trimming);
881  os->start_trimming = 0;
882  os->end_trimming = 0;
883  }
884 
885  if (os->new_metadata) {
888  if (ret < 0)
889  return ret;
890 
891  os->new_metadata = NULL;
892  os->new_metadata_size = 0;
893  }
894 
895  return psize;
896 }
897 
898 static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
899  int64_t *pos_arg, int64_t pos_limit)
900 {
901  struct ogg *ogg = s->priv_data;
902  AVIOContext *bc = s->pb;
904  int64_t keypos = -1;
905  int i;
906  int pstart, psize;
907  avio_seek(bc, *pos_arg, SEEK_SET);
908  ogg_reset(s);
909 
910  while ( avio_tell(bc) <= pos_limit
911  && !ogg_packet(s, &i, &pstart, &psize, pos_arg)) {
912  if (i == stream_index) {
913  struct ogg_stream *os = ogg->streams + stream_index;
914  // Do not trust the last timestamps of an ogm video
915  if ( (os->flags & OGG_FLAG_EOS)
916  && !(os->flags & OGG_FLAG_BOS)
917  && os->codec == &ff_ogm_video_codec)
918  continue;
919  pts = ogg_calc_pts(s, i, NULL);
921  if (os->pflags & AV_PKT_FLAG_KEY) {
922  keypos = *pos_arg;
923  } else if (os->keyframe_seek) {
924  // if we had a previous keyframe but no pts for it,
925  // return that keyframe with this pts value.
926  if (keypos >= 0)
927  *pos_arg = keypos;
928  else
930  }
931  }
932  if (pts != AV_NOPTS_VALUE)
933  break;
934  }
935  ogg_reset(s);
936  return pts;
937 }
938 
939 static int ogg_read_seek(AVFormatContext *s, int stream_index,
940  int64_t timestamp, int flags)
941 {
942  struct ogg *ogg = s->priv_data;
943  struct ogg_stream *os = ogg->streams + stream_index;
944  int ret;
945 
946  av_assert0(stream_index < ogg->nstreams);
947  // Ensure everything is reset even when seeking via
948  // the generated index.
949  ogg_reset(s);
950 
951  // Try seeking to a keyframe first. If this fails (very possible),
952  // av_seek_frame will fall back to ignoring keyframes
953  if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
954  && !(flags & AVSEEK_FLAG_ANY))
955  os->keyframe_seek = 1;
956 
957  ret = ff_seek_frame_binary(s, stream_index, timestamp, flags);
958  ogg_reset(s);
959  os = ogg->streams + stream_index;
960  if (ret < 0)
961  os->keyframe_seek = 0;
962  return ret;
963 }
964 
965 static int ogg_probe(const AVProbeData *p)
966 {
967  if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
968  return AVPROBE_SCORE_MAX;
969  return 0;
970 }
971 
973  .p.name = "ogg",
974  .p.long_name = NULL_IF_CONFIG_SMALL("Ogg"),
975  .p.extensions = "ogg",
977  .priv_data_size = sizeof(struct ogg),
978  .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
979  .read_probe = ogg_probe,
980  .read_header = ogg_read_header,
981  .read_packet = ogg_read_packet,
982  .read_close = ogg_read_close,
983  .read_seek = ogg_read_seek,
984  .read_timestamp = ogg_read_timestamp,
985 };
ff_old_flac_codec
const struct ogg_codec ff_old_flac_codec
Definition: oggparseflac.c:136
flags
const SwsFlags flags[]
Definition: swscale.c:61
ff_ogm_text_codec
const struct ogg_codec ff_ogm_text_codec
Definition: oggparseogm.c:213
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:216
ff_seek_frame_binary
int ff_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
Perform a binary search using av_index_search_timestamp() and FFInputFormat.read_timestamp().
Definition: seek.c:290
ogg_stream::segp
int segp
Definition: oggdec.h:85
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: defs.h:51
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
ogg_stream::lastpts
int64_t lastpts
Definition: oggdec.h:78
ff_ogm_audio_codec
const struct ogg_codec ff_ogm_audio_codec
Definition: oggparseogm.c:204
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:422
ogg_codec::magicsize
uint8_t magicsize
Definition: oggdec.h:32
ogg_validate_keyframe
static void ogg_validate_keyframe(AVFormatContext *s, int idx, int pstart, int psize)
Definition: oggdec.c:807
ffformatcontext
static av_always_inline FFFormatContext * ffformatcontext(AVFormatContext *s)
Definition: internal.h:123
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
ogg_stream::bufpos
unsigned int bufpos
Definition: oggdec.h:70
int64_t
long long int64_t
Definition: coverity.c:34
ff_vp8_codec
const struct ogg_codec ff_vp8_codec
Definition: oggparsevp8.c:139
ogg_stream::got_start
int got_start
Definition: oggdec.h:90
ff_old_dirac_codec
const struct ogg_codec ff_old_dirac_codec
Definition: oggparsedirac.c:126
AVPacket::data
uint8_t * data
Definition: packet.h:535
ogg_stream::granule
uint64_t granule
Definition: oggdec.h:76
ogg_stream::start_trimming
int start_trimming
set the number of packets to drop from the start
Definition: oggdec.h:93
ogg_read_header
static int ogg_read_header(AVFormatContext *s)
Definition: oggdec.c:734
ogg_new_stream
static int ogg_new_stream(AVFormatContext *s, uint32_t serial)
Definition: oggdec.c:249
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:553
ogg_stream::nb_header
int nb_header
set to the number of parsed headers
Definition: oggdec.h:92
ogg_stream::buf
uint8_t * buf
Definition: oggdec.h:68
ogg_stream::nsegs
int nsegs
Definition: oggdec.h:85
ogg_reset
static int ogg_reset(AVFormatContext *s)
Definition: oggdec.c:158
AVFMT_NOBINSEARCH
#define AVFMT_NOBINSEARCH
Format does not allow to fall back on binary search via read_timestamp.
Definition: avformat.h:485
ogg
Definition: oggdec.h:108
avio_size
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:323
ost
static AVStream * ost
Definition: vaapi_transcode.c:42
ff_vorbis_codec
const struct ogg_codec ff_vorbis_codec
Definition: oggparsevorbis.c:511
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:590
ffio_get_checksum
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:583
ff_flac_codec
const struct ogg_codec ff_flac_codec
Definition: oggparseflac.c:129
ff_ogg_demuxer
const FFInputFormat ff_ogg_demuxer
Definition: oggdec.c:972
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
ogg_codec::packet
int(* packet)(AVFormatContext *, int)
Attempt to process a packet as a data packet.
Definition: oggdec.h:48
DECODER_BUFFER_SIZE
#define DECODER_BUFFER_SIZE
Definition: oggdec.c:42
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:777
ogg_gptopts
static uint64_t ogg_gptopts(AVFormatContext *s, int i, uint64_t gp, int64_t *dts)
Definition: oggdec.h:174
ogg_stream::serial
uint32_t serial
Definition: oggdec.h:75
av_packet_add_side_data
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type, uint8_t *data, size_t size)
Wrap an existing array as a packet side data.
Definition: packet.c:198
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2381
ogg_stream::lastdts
int64_t lastdts
Definition: oggdec.h:79
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:480
ogg::headers
int headers
Definition: oggdec.h:111
pts
static int64_t pts
Definition: transcode_aac.c:644
ss
#define ss(width, name, subs,...)
Definition: cbs_vp9.c:202
ogg_packet
static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize, int64_t *fpos)
find the next Ogg packet
Definition: oggdec.c:500
free_stream
static void free_stream(AVFormatContext *s, int i)
Definition: oggdec.c:67
avassert.h
ogg_stream::pstart
unsigned int pstart
Definition: oggdec.h:71
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:761
AV_LOG_TRACE
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:236
pkt
AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:210
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: packet.c:99
OGG_NOGRANULE_VALUE
#define OGG_NOGRANULE_VALUE
Definition: oggdec.h:121
av_realloc_array
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:217
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:550
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
ogg_stream::got_data
int got_data
1 if the stream got some data (non-initial packets), 0 otherwise
Definition: oggdec.h:91
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
ogg_stream::page_end
int page_end
current packet is the last one completed in the page
Definition: oggdec.h:88
FFFormatContext::data_offset
int64_t data_offset
offset of the first packet
Definition: internal.h:89
ogg::curidx
int curidx
Definition: oggdec.h:112
ogg_stream::new_metadata
uint8_t * new_metadata
Definition: oggdec.h:95
FFFormatContext
Definition: internal.h:64
FF_INFMT_FLAG_INIT_CLEANUP
#define FF_INFMT_FLAG_INIT_CLEANUP
For an FFInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: demux.h:35
ogg_stream::page_pos
int64_t page_pos
file offset of the current page
Definition: oggdec.h:81
AVFormatContext
Format I/O context.
Definition: avformat.h:1265
ogg_codec::header
int(* header)(AVFormatContext *, int)
Attempt to process a packet as a header.
Definition: oggdec.h:40
internal.h
NULL
#define NULL
Definition: coverity.c:32
ogg_replace_stream
static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, char *magic, int page_size, int probing)
Replace the current stream with a new one.
Definition: oggdec.c:210
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
ff_ogm_old_codec
const struct ogg_codec ff_ogm_old_codec
Definition: oggparseogm.c:222
ogg_stream::flags
int flags
Definition: oggdec.h:82
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
ogg_read_seek
static int ogg_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: oggdec.c:939
ogg::page_pos
int64_t page_pos
file offset of the current page
Definition: oggdec.h:113
ogg::streams
struct ogg_stream * streams
Definition: oggdec.h:109
ogg_save
static int ogg_save(AVFormatContext *s)
Definition: oggdec.c:83
ogg_get_length
static int ogg_get_length(AVFormatContext *s)
Definition: oggdec.c:650
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
buf_realloc
static int buf_realloc(struct ogg_stream *os, int size)
Definition: oggdec.c:300
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:261
ogg_read_close
static int ogg_read_close(AVFormatContext *s)
Definition: oggdec.c:719
av_err2str
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:122
ogg_stream::private
void * private
Definition: oggdec.h:97
ogg_stream::keyframe_seek
int keyframe_seek
Definition: oggdec.h:89
size
int size
Definition: twinvq_data.h:10344
AV_PKT_DATA_METADATA_UPDATE
@ AV_PKT_DATA_METADATA_UPDATE
A list of zero terminated key/value strings.
Definition: packet.h:206
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:247
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
data_packets_seen
static int data_packets_seen(const struct ogg *ogg)
Definition: oggdec.c:290
ffio_init_checksum
void ffio_init_checksum(AVIOContext *s, unsigned long(*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum)
Definition: aviobuf.c:591
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:46
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:534
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:603
av_reallocp_array
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate an array through a pointer to a pointer.
Definition: mem.c:225
ffio_ensure_seekback
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:1023
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:541
ogg::state
struct ogg_state * state
Definition: oggdec.h:114
version
version
Definition: libkvazaar.c:315
ff_crc04C11DB7_update
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:565
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:221
MAX_PAGE_SIZE
#define MAX_PAGE_SIZE
Definition: oggdec.c:41
ogg_stream::pflags
unsigned int pflags
Definition: oggdec.h:73
ogg::nstreams
int nstreams
Definition: oggdec.h:110
ogg_stream::sync_pos
int64_t sync_pos
file offset of the first page needed to reconstruct the current packet
Definition: oggdec.h:80
ogg_stream::incomplete
int incomplete
whether we're expecting a continuation in the next page
Definition: oggdec.h:87
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:528
ogg_stream
Definition: oggdec.h:67
avio_internal.h
AV_CODEC_ID_THEORA
@ AV_CODEC_ID_THEORA
Definition: codec_id.h:82
ff_ogm_video_codec
const struct ogg_codec ff_ogm_video_codec
Definition: oggparseogm.c:195
OGG_FLAG_CONT
#define OGG_FLAG_CONT
Definition: oggdec.h:117
ff_skeleton_codec
const struct ogg_codec ff_skeleton_codec
Definition: oggparseskeleton.c:96
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
demux.h
ogg_codecs
static const struct ogg_codec *const ogg_codecs[]
Definition: oggdec.c:44
ogg_stream::header
int header
Definition: oggdec.h:84
ogg_read_timestamp
static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit)
Definition: oggdec.c:898
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:757
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:745
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
avformat.h
ogg_find_codec
static const struct ogg_codec * ogg_find_codec(uint8_t *buf, int size)
Definition: oggdec.c:193
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
ogg_find_stream
static int ogg_find_stream(struct ogg *ogg, int serial)
Definition: oggdec.h:162
ogg_codec::cleanup
void(* cleanup)(AVFormatContext *s, int idx)
Definition: oggdec.h:64
oggdec.h
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:41
av_packet_new_side_data
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, size_t size)
Allocate new information of a packet.
Definition: packet.c:232
ogg_restore
static int ogg_restore(AVFormatContext *s)
Definition: oggdec.c:119
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
ogg_stream::start_granule
uint64_t start_granule
Definition: oggdec.h:77
AV_PKT_DATA_SKIP_SAMPLES
@ AV_PKT_DATA_SKIP_SAMPLES
Recommmends skipping the specified number of samples.
Definition: packet.h:153
ogg_read_packet
static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: oggdec.c:828
AVPacket::stream_index
int stream_index
Definition: packet.h:537
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
ogg_stream::new_metadata_size
size_t new_metadata_size
Definition: oggdec.h:96
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:200
ogg_codec::nb_header
int nb_header
Number of expected headers.
Definition: oggdec.h:63
ogg_stream::segments
uint8_t segments[255]
Definition: oggdec.h:86
AVFMT_TS_DISCONT
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:481
mem.h
OGG_FLAG_EOS
#define OGG_FLAG_EOS
Definition: oggdec.h:119
ogg_state
Definition: oggdec.h:100
ogg_calc_pts
static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
Definition: oggdec.c:777
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
ff_celt_codec
const struct ogg_codec ff_celt_codec
Definition: oggparsecelt.c:93
ogg_probe
static int ogg_probe(const AVProbeData *p)
Definition: oggdec.c:965
AVPacket
This structure stores compressed data.
Definition: packet.h:512
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
ogg_stream::psize
unsigned int psize
Definition: oggdec.h:72
OGG_FLAG_BOS
#define OGG_FLAG_BOS
Definition: oggdec.h:118
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:555
FFInputFormat
Definition: demux.h:42
avio_rl64
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:738
ogg_codec
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggdec.h:30
AV_CODEC_ID_VP8
@ AV_CODEC_ID_VP8
Definition: codec_id.h:192
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
ogg_read_page
static int ogg_read_page(AVFormatContext *s, int *sid, int probing)
Definition: oggdec.c:314
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
ogg_codec::magic
const int8_t * magic
Definition: oggdec.h:31
ogg_stream::end_trimming
int end_trimming
set the number of packets to drop from the end
Definition: oggdec.h:94
ff_dirac_codec
const struct ogg_codec ff_dirac_codec
Definition: oggparsedirac.c:117
ff_speex_codec
const struct ogg_codec ff_speex_codec
Definition: oggparsespeex.c:144
ogg_codec::granule_is_start
int granule_is_start
1 if granule is the start time of the associated packet.
Definition: oggdec.h:59
ogg_stream::pduration
unsigned int pduration
Definition: oggdec.h:74
ff_theora_codec
const struct ogg_codec ff_theora_codec
Definition: oggparsetheora.c:211
av_realloc
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:155
ogg_stream::codec
const struct ogg_codec * codec
Definition: oggdec.h:83
ff_opus_codec
const struct ogg_codec ff_opus_codec
Definition: oggparseopus.c:182
ogg_stream::bufsize
unsigned int bufsize
Definition: oggdec.h:69
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346