FFmpeg  4.4
mpeg.c
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1 /*
2  * MPEG-1/2 demuxer
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avformat.h"
23 #include "avio_internal.h"
24 #include "internal.h"
25 #include "mpeg.h"
26 
27 /*********************************************/
28 /* demux code */
29 
30 #define MAX_SYNC_SIZE 100000
31 
32 static int check_pes(const uint8_t *p, const uint8_t *end)
33 {
34  int pes1;
35  int pes2 = (p[3] & 0xC0) == 0x80 &&
36  (p[4] & 0xC0) != 0x40 &&
37  ((p[4] & 0xC0) == 0x00 ||
38  (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
39 
40  for (p += 3; p < end && *p == 0xFF; p++) ;
41  if ((*p & 0xC0) == 0x40)
42  p += 2;
43 
44  if ((*p & 0xF0) == 0x20)
45  pes1 = p[0] & p[2] & p[4] & 1;
46  else if ((*p & 0xF0) == 0x30)
47  pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
48  else
49  pes1 = *p == 0x0F;
50 
51  return pes1 || pes2;
52 }
53 
54 static int check_pack_header(const uint8_t *buf)
55 {
56  return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
57 }
58 
59 static int mpegps_probe(const AVProbeData *p)
60 {
61  uint32_t code = -1;
62  int i;
63  int sys = 0, pspack = 0, priv1 = 0, vid = 0;
64  int audio = 0, invalid = 0, score = 0;
65  int endpes = 0;
66 
67  for (i = 0; i < p->buf_size; i++) {
68  code = (code << 8) + p->buf[i];
69  if ((code & 0xffffff00) == 0x100) {
70  int len = p->buf[i + 1] << 8 | p->buf[i + 2];
71  int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
72  int pack = check_pack_header(p->buf + i);
73 
75  sys++;
76  else if (code == PACK_START_CODE && pack)
77  pspack++;
78  else if ((code & 0xf0) == VIDEO_ID && pes) {
79  endpes = i + len;
80  vid++;
81  }
82  // skip pes payload to avoid start code emulation for private
83  // and audio streams
84  else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
85  else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
86  else if (code == 0x1fd && pes) vid++; //VC1
87 
88  else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
89  else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
90  else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
91  }
92  }
93 
94  if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
95  score = AVPROBE_SCORE_EXTENSION / 2;
96 
97 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
98 // vid, audio, sys, pspack, invalid, p->buf_size);
99 
100  if (sys > invalid && sys * 9 <= pspack * 10)
101  return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
102  : AVPROBE_SCORE_EXTENSION / 2 + (audio + vid + pspack > 1); // 1 more than mp3
103  if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
104  return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
105  : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
106  if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
107  !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
108  return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
110 
111  // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
112  // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
113  // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
114  return score;
115 }
116 
117 typedef struct MpegDemuxContext {
119  unsigned char psm_es_type[256];
120  int sofdec;
121  int dvd;
123  int raw_ac3;
125 
127 {
128  MpegDemuxContext *m = s->priv_data;
129  char buffer[7] = { 0 };
130  int64_t last_pos = avio_tell(s->pb);
131 
132  m->header_state = 0xff;
133  s->ctx_flags |= AVFMTCTX_NOHEADER;
134 
135  avio_get_str(s->pb, 6, buffer, sizeof(buffer));
136  if (!memcmp("IMKH", buffer, 4)) {
137  m->imkh_cctv = 1;
138  } else if (!memcmp("Sofdec", buffer, 6)) {
139  m->sofdec = 1;
140  } else
141  avio_seek(s->pb, last_pos, SEEK_SET);
142 
143  /* no need to do more */
144  return 0;
145 }
146 
147 static int64_t get_pts(AVIOContext *pb, int c)
148 {
149  uint8_t buf[5];
150  int ret;
151 
152  buf[0] = c < 0 ? avio_r8(pb) : c;
153  ret = avio_read(pb, buf + 1, 4);
154  if (ret < 4)
155  return AV_NOPTS_VALUE;
156 
157  return ff_parse_pes_pts(buf);
158 }
159 
160 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
161  int32_t *header_state)
162 {
163  unsigned int state, v;
164  int val, n;
165 
166  state = *header_state;
167  n = *size_ptr;
168  while (n > 0) {
169  if (avio_feof(pb))
170  break;
171  v = avio_r8(pb);
172  n--;
173  if (state == 0x000001) {
174  state = ((state << 8) | v) & 0xffffff;
175  val = state;
176  goto found;
177  }
178  state = ((state << 8) | v) & 0xffffff;
179  }
180  val = -1;
181 
182 found:
183  *header_state = state;
184  *size_ptr = n;
185  return val;
186 }
187 
188 /**
189  * Extract stream types from a program stream map
190  * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
191  *
192  * @return number of bytes occupied by PSM in the bitstream
193  */
195 {
196  int psm_length, ps_info_length, es_map_length;
197 
198  psm_length = avio_rb16(pb);
199  avio_r8(pb);
200  avio_r8(pb);
201  ps_info_length = avio_rb16(pb);
202 
203  /* skip program_stream_info */
204  avio_skip(pb, ps_info_length);
205  /*es_map_length = */avio_rb16(pb);
206  /* Ignore es_map_length, trust psm_length */
207  es_map_length = psm_length - ps_info_length - 10;
208 
209  /* at least one es available? */
210  while (es_map_length >= 4) {
211  unsigned char type = avio_r8(pb);
212  unsigned char es_id = avio_r8(pb);
213  uint16_t es_info_length = avio_rb16(pb);
214 
215  /* remember mapping from stream id to stream type */
216  m->psm_es_type[es_id] = type;
217  /* skip program_stream_info */
218  avio_skip(pb, es_info_length);
219  es_map_length -= 4 + es_info_length;
220  }
221  avio_rb32(pb); /* crc32 */
222  return 2 + psm_length;
223 }
224 
225 /* read the next PES header. Return its position in ppos
226  * (if not NULL), and its start code, pts and dts.
227  */
229  int64_t *ppos, int *pstart_code,
230  int64_t *ppts, int64_t *pdts)
231 {
232  MpegDemuxContext *m = s->priv_data;
233  int len, size, startcode, c, flags, header_len;
234  int pes_ext, ext2_len, id_ext, skip;
235  int64_t pts, dts;
236  int64_t last_sync = avio_tell(s->pb);
237 
238 error_redo:
239  avio_seek(s->pb, last_sync, SEEK_SET);
240 redo:
241  /* next start code (should be immediately after) */
242  m->header_state = 0xff;
244  startcode = find_next_start_code(s->pb, &size, &m->header_state);
245  last_sync = avio_tell(s->pb);
246  if (startcode < 0) {
247  if (avio_feof(s->pb))
248  return AVERROR_EOF;
249  // FIXME we should remember header_state
250  return FFERROR_REDO;
251  }
252 
253  if (startcode == PACK_START_CODE)
254  goto redo;
255  if (startcode == SYSTEM_HEADER_START_CODE)
256  goto redo;
257  if (startcode == PADDING_STREAM) {
258  avio_skip(s->pb, avio_rb16(s->pb));
259  goto redo;
260  }
261  if (startcode == PRIVATE_STREAM_2) {
262  if (!m->sofdec) {
263  /* Need to detect whether this from a DVD or a 'Sofdec' stream */
264  int len = avio_rb16(s->pb);
265  int bytesread = 0;
266  uint8_t *ps2buf = av_malloc(len);
267 
268  if (ps2buf) {
269  bytesread = avio_read(s->pb, ps2buf, len);
270 
271  if (bytesread != len) {
272  avio_skip(s->pb, len - bytesread);
273  } else {
274  uint8_t *p = 0;
275  if (len >= 6)
276  p = memchr(ps2buf, 'S', len - 5);
277 
278  if (p)
279  m->sofdec = !memcmp(p+1, "ofdec", 5);
280 
281  m->sofdec -= !m->sofdec;
282 
283  if (m->sofdec < 0) {
284  if (len == 980 && ps2buf[0] == 0) {
285  /* PCI structure? */
286  uint32_t startpts = AV_RB32(ps2buf + 0x0d);
287  uint32_t endpts = AV_RB32(ps2buf + 0x11);
288  uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
289  uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
290  uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
291 
292  m->dvd = (hours <= 23 &&
293  mins <= 59 &&
294  secs <= 59 &&
295  (ps2buf[0x19] & 0x0f) < 10 &&
296  (ps2buf[0x1a] & 0x0f) < 10 &&
297  (ps2buf[0x1b] & 0x0f) < 10 &&
298  endpts >= startpts);
299  } else if (len == 1018 && ps2buf[0] == 1) {
300  /* DSI structure? */
301  uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
302  uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
303  uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
304 
305  m->dvd = (hours <= 23 &&
306  mins <= 59 &&
307  secs <= 59 &&
308  (ps2buf[0x1d] & 0x0f) < 10 &&
309  (ps2buf[0x1e] & 0x0f) < 10 &&
310  (ps2buf[0x1f] & 0x0f) < 10);
311  }
312  }
313  }
314 
315  av_free(ps2buf);
316 
317  /* If this isn't a DVD packet or no memory
318  * could be allocated, just ignore it.
319  * If we did, move back to the start of the
320  * packet (plus 'length' field) */
321  if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
322  /* Skip back failed.
323  * This packet will be lost but that can't be helped
324  * if we can't skip back
325  */
326  goto redo;
327  }
328  } else {
329  /* No memory */
330  avio_skip(s->pb, len);
331  goto redo;
332  }
333  } else if (!m->dvd) {
334  int len = avio_rb16(s->pb);
335  avio_skip(s->pb, len);
336  goto redo;
337  }
338  }
339  if (startcode == PROGRAM_STREAM_MAP) {
340  mpegps_psm_parse(m, s->pb);
341  goto redo;
342  }
343 
344  /* find matching stream */
345  if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
346  (startcode >= 0x1e0 && startcode <= 0x1ef) ||
347  (startcode == 0x1bd) ||
348  (startcode == PRIVATE_STREAM_2) ||
349  (startcode == 0x1fd)))
350  goto redo;
351  if (ppos) {
352  *ppos = avio_tell(s->pb) - 4;
353  }
354  len = avio_rb16(s->pb);
355  pts =
356  dts = AV_NOPTS_VALUE;
357  if (startcode != PRIVATE_STREAM_2)
358  {
359  /* stuffing */
360  for (;;) {
361  if (len < 1)
362  goto error_redo;
363  c = avio_r8(s->pb);
364  len--;
365  /* XXX: for MPEG-1, should test only bit 7 */
366  if (c != 0xff)
367  break;
368  }
369  if ((c & 0xc0) == 0x40) {
370  /* buffer scale & size */
371  avio_r8(s->pb);
372  c = avio_r8(s->pb);
373  len -= 2;
374  }
375  if ((c & 0xe0) == 0x20) {
376  dts =
377  pts = get_pts(s->pb, c);
378  len -= 4;
379  if (c & 0x10) {
380  dts = get_pts(s->pb, -1);
381  len -= 5;
382  }
383  } else if ((c & 0xc0) == 0x80) {
384  /* mpeg 2 PES */
385  flags = avio_r8(s->pb);
386  header_len = avio_r8(s->pb);
387  len -= 2;
388  if (header_len > len)
389  goto error_redo;
390  len -= header_len;
391  if (flags & 0x80) {
392  dts = pts = get_pts(s->pb, -1);
393  header_len -= 5;
394  if (flags & 0x40) {
395  dts = get_pts(s->pb, -1);
396  header_len -= 5;
397  }
398  }
399  if (flags & 0x3f && header_len == 0) {
400  flags &= 0xC0;
401  av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
402  }
403  if (flags & 0x01) { /* PES extension */
404  pes_ext = avio_r8(s->pb);
405  header_len--;
406  /* Skip PES private data, program packet sequence counter
407  * and P-STD buffer */
408  skip = (pes_ext >> 4) & 0xb;
409  skip += skip & 0x9;
410  if (pes_ext & 0x40 || skip > header_len) {
411  av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
412  pes_ext = skip = 0;
413  }
414  avio_skip(s->pb, skip);
415  header_len -= skip;
416 
417  if (pes_ext & 0x01) { /* PES extension 2 */
418  ext2_len = avio_r8(s->pb);
419  header_len--;
420  if ((ext2_len & 0x7f) > 0) {
421  id_ext = avio_r8(s->pb);
422  if ((id_ext & 0x80) == 0)
423  startcode = ((startcode & 0xff) << 8) | id_ext;
424  header_len--;
425  }
426  }
427  }
428  if (header_len < 0)
429  goto error_redo;
430  avio_skip(s->pb, header_len);
431  } else if (c != 0xf)
432  goto redo;
433  }
434 
435  if (startcode == PRIVATE_STREAM_1) {
436  int ret = ffio_ensure_seekback(s->pb, 2);
437 
438  if (ret < 0)
439  return ret;
440 
441  startcode = avio_r8(s->pb);
442  m->raw_ac3 = 0;
443  if (startcode == 0x0b) {
444  if (avio_r8(s->pb) == 0x77) {
445  startcode = 0x80;
446  m->raw_ac3 = 1;
447  avio_skip(s->pb, -2);
448  } else {
449  avio_skip(s->pb, -1);
450  }
451  } else {
452  len--;
453  }
454  }
455  if (len < 0)
456  goto error_redo;
457  if (dts != AV_NOPTS_VALUE && ppos) {
458  int i;
459  for (i = 0; i < s->nb_streams; i++) {
460  if (startcode == s->streams[i]->id &&
461  (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
462  ff_reduce_index(s, i);
463  av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
464  AVINDEX_KEYFRAME /* FIXME keyframe? */);
465  }
466  }
467  }
468 
469  *pstart_code = startcode;
470  *ppts = pts;
471  *pdts = dts;
472  return len;
473 }
474 
476  AVPacket *pkt)
477 {
478  MpegDemuxContext *m = s->priv_data;
479  AVStream *st;
480  int len, startcode, i, es_type, ret;
481  int pcm_dvd = 0;
482  int request_probe= 0;
484  enum AVMediaType type;
485  int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
486 
487 redo:
488  len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
489  if (len < 0)
490  return len;
491 
492  if (startcode >= 0x80 && startcode <= 0xcf) {
493  if (len < 4)
494  goto skip;
495 
496  if (!m->raw_ac3) {
497  /* audio: skip header */
498  avio_skip(s->pb, 3);
499  len -= 3;
500  if (startcode >= 0xb0 && startcode <= 0xbf) {
501  /* MLP/TrueHD audio has a 4-byte header */
502  avio_r8(s->pb);
503  len--;
504  } else if (startcode >= 0xa0 && startcode <= 0xaf) {
505  ret = ffio_ensure_seekback(s->pb, 3);
506  if (ret < 0)
507  return ret;
508  pcm_dvd = (avio_rb24(s->pb) & 0xFF) == 0x80;
509  avio_skip(s->pb, -3);
510  }
511  }
512  }
513 
514  /* now find stream */
515  for (i = 0; i < s->nb_streams; i++) {
516  st = s->streams[i];
517  if (st->id == startcode)
518  goto found;
519  }
520 
521  es_type = m->psm_es_type[startcode & 0xff];
522  if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
525  } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
528  } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
529  es_type == STREAM_TYPE_AUDIO_MPEG2) {
532  } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
535  } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
538  } else if (es_type == STREAM_TYPE_VIDEO_H264) {
541  } else if (es_type == STREAM_TYPE_VIDEO_HEVC) {
544  } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
547  } else if (m->imkh_cctv && es_type == 0x91) {
550  } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
551  static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
552  unsigned char buf[8];
553 
554  avio_read(s->pb, buf, 8);
555  avio_seek(s->pb, -8, SEEK_CUR);
556  if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
558  else
559  request_probe= 1;
561  } else if (startcode == PRIVATE_STREAM_2) {
564  } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
566  if (m->sofdec > 0) {
568  // Auto-detect AC-3
569  request_probe = 50;
570  } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
572  request_probe = 50;
573  } else {
575  if (m->imkh_cctv)
576  request_probe = 25;
577  }
578  } else if (startcode >= 0x80 && startcode <= 0x87) {
581  } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
582  (startcode >= 0x98 && startcode <= 0x9f)) {
583  /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
586  } else if (startcode >= 0xa0 && startcode <= 0xaf) {
588  if (!pcm_dvd) {
590  } else {
592  }
593  } else if (startcode >= 0xb0 && startcode <= 0xbf) {
596  } else if (startcode >= 0xc0 && startcode <= 0xcf) {
597  /* Used for both AC-3 and E-AC-3 in EVOB files */
600  } else if (startcode >= 0x20 && startcode <= 0x3f) {
603  } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
606  } else {
607 skip:
608  /* skip packet */
609  avio_skip(s->pb, len);
610  goto redo;
611  }
612  /* no stream found: add a new stream */
613  st = avformat_new_stream(s, NULL);
614  if (!st)
615  goto skip;
616  st->id = startcode;
617  st->codecpar->codec_type = type;
618  st->codecpar->codec_id = codec_id;
621  st->codecpar->channels = 1;
623  st->codecpar->sample_rate = 8000;
624  }
625  st->internal->request_probe = request_probe;
627 
628 found:
629  if (st->discard >= AVDISCARD_ALL)
630  goto skip;
631  if (startcode >= 0xa0 && startcode <= 0xaf) {
632  if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
633  if (len < 6)
634  goto skip;
635  avio_skip(s->pb, 6);
636  len -=6;
637  }
638  }
639  ret = av_get_packet(s->pb, pkt, len);
640 
641  pkt->pts = pts;
642  pkt->dts = dts;
643  pkt->pos = dummy_pos;
644  pkt->stream_index = st->index;
645 
646  if (s->debug & FF_FDEBUG_TS)
647  av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
648  pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
649  pkt->size);
650 
651  return (ret < 0) ? ret : 0;
652 }
653 
654 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
655  int64_t *ppos, int64_t pos_limit)
656 {
657  int len, startcode;
658  int64_t pos, pts, dts;
659 
660  pos = *ppos;
661  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
662  return AV_NOPTS_VALUE;
663 
664  for (;;) {
665  len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
666  if (len < 0) {
667  if (s->debug & FF_FDEBUG_TS)
668  av_log(s, AV_LOG_DEBUG, "none (ret=%d)\n", len);
669  return AV_NOPTS_VALUE;
670  }
671  if (startcode == s->streams[stream_index]->id &&
672  dts != AV_NOPTS_VALUE) {
673  break;
674  }
675  avio_skip(s->pb, len);
676  }
677  if (s->debug & FF_FDEBUG_TS)
678  av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
679  pos, dts, dts / 90000.0);
680  *ppos = pos;
681  return dts;
682 }
683 
685  .name = "mpeg",
686  .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
687  .priv_data_size = sizeof(MpegDemuxContext),
691  .read_timestamp = mpegps_read_dts,
693 };
694 
695 #if CONFIG_VOBSUB_DEMUXER
696 
697 #include "subtitles.h"
698 #include "libavutil/avassert.h"
699 #include "libavutil/bprint.h"
700 #include "libavutil/opt.h"
701 
702 #define REF_STRING "# VobSub index file,"
703 #define MAX_LINE_SIZE 2048
704 
705 typedef struct VobSubDemuxContext {
706  const AVClass *class;
707  AVFormatContext *sub_ctx;
708  FFDemuxSubtitlesQueue q[32];
709  char *sub_name;
710 } VobSubDemuxContext;
711 
712 static int vobsub_probe(const AVProbeData *p)
713 {
714  if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
715  return AVPROBE_SCORE_MAX;
716  return 0;
717 }
718 
719 static int vobsub_read_close(AVFormatContext *s)
720 {
721  VobSubDemuxContext *vobsub = s->priv_data;
722  int i;
723 
724  for (i = 0; i < s->nb_streams; i++)
725  ff_subtitles_queue_clean(&vobsub->q[i]);
726  if (vobsub->sub_ctx)
727  avformat_close_input(&vobsub->sub_ctx);
728  return 0;
729 }
730 
731 static int vobsub_read_header(AVFormatContext *s)
732 {
733  int i, ret = 0, header_parsed = 0, langidx = 0;
734  VobSubDemuxContext *vobsub = s->priv_data;
735  size_t fname_len;
736  AVBPrint header;
737  int64_t delay = 0;
738  AVStream *st = NULL;
739  int stream_id = -1;
740  char id[64] = {0};
741  char alt[MAX_LINE_SIZE] = {0};
743 
744  if (!vobsub->sub_name) {
745  char *ext;
746  vobsub->sub_name = av_strdup(s->url);
747  if (!vobsub->sub_name) {
748  return AVERROR(ENOMEM);
749  }
750 
751  fname_len = strlen(vobsub->sub_name);
752  ext = vobsub->sub_name - 3 + fname_len;
753  if (fname_len < 4 || *(ext - 1) != '.') {
754  av_log(s, AV_LOG_ERROR, "The input index filename is too short "
755  "to guess the associated .SUB file\n");
756  return AVERROR_INVALIDDATA;
757  }
758  memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
759  av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name);
760  }
761 
762  if (!(iformat = av_find_input_format("mpeg"))) {
764  }
765 
766  vobsub->sub_ctx = avformat_alloc_context();
767  if (!vobsub->sub_ctx) {
768  return AVERROR(ENOMEM);
769  }
770 
772 
773  if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
774  goto end;
775 
776  ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
777  if (ret < 0) {
778  av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
779  goto end;
780  }
781 
782  while (!avio_feof(s->pb)) {
783  char line[MAX_LINE_SIZE];
784  int len = ff_get_line(s->pb, line, sizeof(line));
785 
786  if (!len)
787  break;
788 
789  line[strcspn(line, "\r\n")] = 0;
790 
791  if (!strncmp(line, "id:", 3)) {
792  if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
793  av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
794  "assuming 'id: und, index: 0'\n", line);
795  strcpy(id, "und");
796  stream_id = 0;
797  }
798 
799  if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
800  av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
801  ret = AVERROR(EINVAL);
802  goto end;
803  }
804 
805  header_parsed = 1;
806  alt[0] = '\0';
807  /* We do not create the stream immediately to avoid adding empty
808  * streams. See the following timestamp entry. */
809 
810  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
811 
812  } else if (!strncmp(line, "timestamp:", 10)) {
813  AVPacket *sub;
814  int hh, mm, ss, ms;
815  int64_t pos, timestamp;
816  const char *p = line + 10;
817 
818  if (stream_id == -1) {
819  av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
820  ret = AVERROR_INVALIDDATA;
821  goto end;
822  }
823 
824  if (!st || st->id != stream_id) {
825  st = avformat_new_stream(s, NULL);
826  if (!st) {
827  ret = AVERROR(ENOMEM);
828  goto end;
829  }
830  st->id = stream_id;
833  avpriv_set_pts_info(st, 64, 1, 1000);
834  av_dict_set(&st->metadata, "language", id, 0);
835  if (alt[0])
836  av_dict_set(&st->metadata, "title", alt, 0);
837  }
838 
839  if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
840  &hh, &mm, &ss, &ms, &pos) != 5) {
841  av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
842  "abort parsing\n", line);
843  ret = AVERROR_INVALIDDATA;
844  goto end;
845  }
846  timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
847  timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
848 
849  sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
850  if (!sub) {
851  ret = AVERROR(ENOMEM);
852  goto end;
853  }
854  sub->pos = pos;
855  sub->pts = timestamp;
856  sub->stream_index = s->nb_streams - 1;
857 
858  } else if (!strncmp(line, "alt:", 4)) {
859  const char *p = line + 4;
860 
861  while (*p == ' ')
862  p++;
863  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
864  av_strlcpy(alt, p, sizeof(alt));
865  header_parsed = 1;
866 
867  } else if (!strncmp(line, "delay:", 6)) {
868  int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
869  const char *p = line + 6;
870 
871  while (*p == ' ')
872  p++;
873  if (*p == '-' || *p == '+') {
874  sign = *p == '-' ? -1 : 1;
875  p++;
876  }
877  sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
878  delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
879 
880  } else if (!strncmp(line, "langidx:", 8)) {
881  const char *p = line + 8;
882 
883  if (sscanf(p, "%d", &langidx) != 1)
884  av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
885 
886  } else if (!header_parsed) {
887  if (line[0] && line[0] != '#')
888  av_bprintf(&header, "%s\n", line);
889  }
890  }
891 
892  if (langidx < s->nb_streams)
893  s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
894 
895  for (i = 0; i < s->nb_streams; i++) {
896  vobsub->q[i].sort = SUB_SORT_POS_TS;
897  vobsub->q[i].keep_duplicates = 1;
898  ff_subtitles_queue_finalize(s, &vobsub->q[i]);
899  }
900 
901  if (!av_bprint_is_complete(&header)) {
902  ret = AVERROR(ENOMEM);
903  goto end;
904  }
905  for (i = 0; i < s->nb_streams; i++) {
906  AVCodecParameters *par = s->streams[i]->codecpar;
907  ret = ff_alloc_extradata(par, header.len);
908  if (ret < 0) {
909  goto end;
910  }
911  memcpy(par->extradata, header.str, header.len);
912  }
913 end:
914  if (ret < 0)
915  vobsub_read_close(s);
917  return ret;
918 }
919 
920 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
921 {
922  VobSubDemuxContext *vobsub = s->priv_data;
924  AVIOContext *pb = vobsub->sub_ctx->pb;
925  int ret, psize, total_read = 0, i;
926 
927  int64_t min_ts = INT64_MAX;
928  int sid = 0;
929  for (i = 0; i < s->nb_streams; i++) {
930  FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
931  int64_t ts;
932  av_assert0(tmpq->nb_subs);
933 
934  if (tmpq->current_sub_idx >= tmpq->nb_subs)
935  continue;
936 
937  ts = tmpq->subs[tmpq->current_sub_idx]->pts;
938  if (ts < min_ts) {
939  min_ts = ts;
940  sid = i;
941  }
942  }
943  q = &vobsub->q[sid];
944  /* The returned packet will have size zero,
945  * so that it can be directly used with av_grow_packet. */
947  if (ret < 0)
948  return ret;
949 
950  /* compute maximum packet size using the next packet position. This is
951  * useful when the len in the header is non-sense */
952  if (q->current_sub_idx < q->nb_subs) {
953  psize = q->subs[q->current_sub_idx]->pos - pkt->pos;
954  } else {
955  int64_t fsize = avio_size(pb);
956  psize = fsize < 0 ? 0xffff : fsize - pkt->pos;
957  }
958 
959  avio_seek(pb, pkt->pos, SEEK_SET);
960 
961  do {
962  int n, to_read, startcode;
963  int64_t pts, dts;
964  int64_t old_pos = avio_tell(pb), new_pos;
965  int pkt_size;
966 
967  ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
968  if (ret < 0) {
969  if (pkt->size) // raise packet even if incomplete
970  break;
971  return ret;
972  }
973  to_read = ret & 0xffff;
974  new_pos = avio_tell(pb);
975  pkt_size = ret + (new_pos - old_pos);
976 
977  /* this prevents reads above the current packet */
978  if (total_read + pkt_size > psize)
979  break;
980  total_read += pkt_size;
981 
982  /* the current chunk doesn't match the stream index (unlikely) */
983  if ((startcode & 0x1f) != s->streams[pkt->stream_index]->id)
984  break;
985 
986  ret = av_grow_packet(pkt, to_read);
987  if (ret < 0)
988  return ret;
989 
990  n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
991  if (n < to_read)
992  pkt->size -= to_read - n;
993  } while (total_read < psize);
994 
995  return 0;
996 }
997 
998 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
999  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
1000 {
1001  VobSubDemuxContext *vobsub = s->priv_data;
1002 
1003  /* Rescale requested timestamps based on the first stream (timebase is the
1004  * same for all subtitles stream within a .idx/.sub). Rescaling is done just
1005  * like in avformat_seek_file(). */
1006  if (stream_index == -1 && s->nb_streams != 1) {
1007  int i, ret = 0;
1008  AVRational time_base = s->streams[0]->time_base;
1009  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
1010  min_ts = av_rescale_rnd(min_ts, time_base.den,
1011  time_base.num * (int64_t)AV_TIME_BASE,
1013  max_ts = av_rescale_rnd(max_ts, time_base.den,
1014  time_base.num * (int64_t)AV_TIME_BASE,
1016  for (i = 0; i < s->nb_streams; i++) {
1017  int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
1018  min_ts, ts, max_ts, flags);
1019  if (r < 0)
1020  ret = r;
1021  }
1022  return ret;
1023  }
1024 
1025  if (stream_index == -1) // only 1 stream
1026  stream_index = 0;
1027  return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1028  min_ts, ts, max_ts, flags);
1029 }
1030 
1031 static const AVOption options[] = {
1032  { "sub_name", "URI for .sub file", offsetof(VobSubDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1033  { NULL }
1034 };
1035 
1036 static const AVClass vobsub_demuxer_class = {
1037  .class_name = "vobsub",
1038  .item_name = av_default_item_name,
1039  .option = options,
1040  .version = LIBAVUTIL_VERSION_INT,
1041 };
1042 
1044  .name = "vobsub",
1045  .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1046  .priv_data_size = sizeof(VobSubDemuxContext),
1047  .read_probe = vobsub_probe,
1048  .read_header = vobsub_read_header,
1049  .read_packet = vobsub_read_packet,
1050  .read_seek2 = vobsub_read_seek,
1051  .read_close = vobsub_read_close,
1052  .flags = AVFMT_SHOW_IDS,
1053  .extensions = "idx",
1054  .priv_class = &vobsub_demuxer_class,
1055 };
1056 #endif
static double val(void *priv, double ch)
Definition: aeval.c:76
AVInputFormat ff_vobsub_demuxer
uint8_t
int32_t
static int64_t fsize(FILE *f)
Definition: audiomatch.c:29
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Main libavformat public API header.
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define FF_FDEBUG_TS
Definition: avformat.h:1518
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1177
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:464
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
#define AVFMT_SHOW_IDS
Show format stream IDs numbers.
Definition: avformat.h:460
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:310
#define ff_const59
The ff_const59 define is not part of the public API and will be removed without further warning.
Definition: avformat.h:533
#define AV_DISPOSITION_DEFAULT
Definition: avformat.h:818
@ AVSTREAM_PARSE_FULL
full parsing and repack
Definition: avformat.h:794
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:342
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:766
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:860
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:774
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:781
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:998
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:789
#define AV_RB32
Definition: intreadwrite.h:130
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define ss(width, name, subs,...)
Definition: cbs_vp9.c:261
#define s(width, name)
Definition: cbs_vp9.c:257
static struct @321 state
#define NULL
Definition: coverity.c:32
static float sub(float src0, float src1)
const OptionDef options[]
static AVInputFormat * iformat
Definition: ffprobe.c:260
static int nb_streams
Definition: ffprobe.c:283
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
#define AV_CH_LAYOUT_MONO
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
@ AV_CODEC_ID_PCM_DVD
Definition: codec_id.h:332
@ AV_CODEC_ID_DVD_SUBTITLE
Definition: codec_id.h:523
@ AV_CODEC_ID_H264
Definition: codec_id.h:76
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AV_CODEC_ID_ADPCM_ADX
Definition: codec_id.h:362
@ AV_CODEC_ID_VC1
Definition: codec_id.h:119
@ AV_CODEC_ID_PCM_ALAW
Definition: codec_id.h:320
@ AV_CODEC_ID_CAVS
Definition: codec_id.h:136
@ AV_CODEC_ID_MP2
Definition: codec_id.h:424
@ AV_CODEC_ID_DTS
Definition: codec_id.h:428
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:223
@ AV_CODEC_ID_DVD_NAV
Definition: codec_id.h:562
@ AV_CODEC_ID_AAC
Definition: codec_id.h:426
@ AV_CODEC_ID_TRUEHD
Definition: codec_id.h:468
@ AV_CODEC_ID_AC3
Definition: codec_id.h:427
@ AV_CODEC_ID_MLP
Definition: codec_id.h:453
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:61
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:425
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:51
@ AV_CODEC_ID_PCM_MULAW
Definition: codec_id.h:319
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding.
Definition: avcodec.h:215
@ AVDISCARD_ALL
discard all
Definition: avcodec.h:236
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:122
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:211
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
ff_const59 AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
Definition: format.c:118
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4477
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:512
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:2011
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:70
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AVERROR_DEMUXER_NOT_FOUND
Demuxer not found.
Definition: error.h:53
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:58
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
@ AV_ROUND_DOWN
Round toward -infinity.
Definition: mathematics.h:82
@ AV_ROUND_PASS_MINMAX
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
Definition: mathematics.h:108
@ AV_ROUND_UP
Round toward +infinity.
Definition: mathematics.h:83
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
AVMediaType
Definition: avutil.h:199
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ AVMEDIA_TYPE_DATA
Opaque data information usually continuous.
Definition: avutil.h:203
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
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
cl_device_type type
int i
Definition: input.c:407
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:160
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:4941
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:3312
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data).
Definition: internal.h:793
void ff_reduce_index(AVFormatContext *s, int stream_index)
Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by dis...
Definition: utils.c:1939
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int64_t get_pts(AVIOContext *pb, int c)
Definition: mpeg.c:147
static int mpegps_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpeg.c:475
static int mpegps_read_pes_header(AVFormatContext *s, int64_t *ppos, int *pstart_code, int64_t *ppts, int64_t *pdts)
Definition: mpeg.c:228
#define MAX_SYNC_SIZE
Definition: mpeg.c:30
static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpeg.c:654
static int find_next_start_code(AVIOContext *pb, int *size_ptr, int32_t *header_state)
Definition: mpeg.c:160
static int check_pack_header(const uint8_t *buf)
Definition: mpeg.c:54
AVInputFormat ff_mpegps_demuxer
Definition: mpeg.c:684
static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
Extract stream types from a program stream map According to ISO/IEC 13818-1 ('MPEG-2 Systems') table ...
Definition: mpeg.c:194
static int check_pes(const uint8_t *p, const uint8_t *end)
Definition: mpeg.c:32
static int mpegps_probe(const AVProbeData *p)
Definition: mpeg.c:59
static int mpegps_read_header(AVFormatContext *s)
Definition: mpeg.c:126
#define AUDIO_ID
Definition: mpeg.h:41
#define STREAM_TYPE_VIDEO_MPEG4
Definition: mpeg.h:56
#define STREAM_TYPE_AUDIO_MPEG2
Definition: mpeg.h:52
#define STREAM_TYPE_VIDEO_HEVC
Definition: mpeg.h:58
#define SYSTEM_HEADER_START_CODE
Definition: mpeg.h:29
#define PRIVATE_STREAM_2
Definition: mpeg.h:39
#define PRIVATE_STREAM_1
Definition: mpeg.h:37
#define PROGRAM_STREAM_MAP
Definition: mpeg.h:36
#define STREAM_TYPE_AUDIO_AC3
Definition: mpeg.h:61
#define STREAM_TYPE_VIDEO_MPEG1
Definition: mpeg.h:49
#define PADDING_STREAM
Definition: mpeg.h:38
#define STREAM_TYPE_AUDIO_AAC
Definition: mpeg.h:55
#define STREAM_TYPE_VIDEO_H264
Definition: mpeg.h:57
#define STREAM_TYPE_AUDIO_MPEG1
Definition: mpeg.h:51
#define VIDEO_ID
Definition: mpeg.h:42
#define PACK_START_CODE
Definition: mpeg.h:28
static int64_t ff_parse_pes_pts(const uint8_t *buf)
Parse MPEG-PES five-byte timestamp.
Definition: mpeg.h:68
#define STREAM_TYPE_VIDEO_MPEG2
Definition: mpeg.h:50
AVOptions.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:279
static const uint8_t header[24]
Definition: sdr2.c:67
static char buffer[20]
Definition: seek.c:32
#define FF_ARRAY_ELEMS(a)
const uint8_t * code
Definition: spdifenc.c:413
unsigned int pos
Definition: spdifenc.c:412
Describe the class of an AVClass context structure.
Definition: log.h:67
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
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int size
Definition: packet.h:370
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:368
uint8_t * data
Definition: packet.h:369
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: internal.h:248
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:928
AVDictionary * metadata
Definition: avformat.h:937
int id
Format-specific stream ID.
Definition: avformat.h:880
int index
stream index in AVFormatContext
Definition: avformat.h:874
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:902
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1113
int nb_subs
number of subtitles packets
Definition: subtitles.h:104
AVPacket ** subs
array of subtitles packets
Definition: subtitles.h:103
int current_sub_idx
current position for the read packet callback
Definition: subtitles.h:106
unsigned char psm_es_type[256]
Definition: mpeg.c:119
int imkh_cctv
Definition: mpeg.c:122
int32_t header_state
Definition: mpeg.c:118
Definition: graph2dot.c:48
int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Update current_sub_idx to emulate a seek.
Definition: subtitles.c:255
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:216
void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q)
Set missing durations, sort subtitles by PTS (and then byte position), and drop duplicated events.
Definition: subtitles.c:198
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:307
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, size_t len, int merge)
Insert a new subtitle event.
Definition: subtitles.c:111
@ SUB_SORT_POS_TS
sort by position, then timestamps
Definition: subtitles.h:31
#define av_free(p)
#define av_malloc(s)
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59
static int64_t pts
int size
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
const char * r
Definition: vf_curves.c:116
#define MAX_LINE_SIZE
Definition: vf_lut3d.c:601
if(ret< 0)
Definition: vf_mcdeint.c:282
int len
static double c[64]