FFmpeg  4.3
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 
74  if (code == SYSTEM_HEADER_START_CODE)
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;
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 
151  buf[0] = c < 0 ? avio_r8(pb) : c;
152  avio_read(pb, buf + 1, 4);
153 
154  return ff_parse_pes_pts(buf);
155 }
156 
157 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
159 {
160  unsigned int state, v;
161  int val, n;
162 
163  state = *header_state;
164  n = *size_ptr;
165  while (n > 0) {
166  if (avio_feof(pb))
167  break;
168  v = avio_r8(pb);
169  n--;
170  if (state == 0x000001) {
171  state = ((state << 8) | v) & 0xffffff;
172  val = state;
173  goto found;
174  }
175  state = ((state << 8) | v) & 0xffffff;
176  }
177  val = -1;
178 
179 found:
180  *header_state = state;
181  *size_ptr = n;
182  return val;
183 }
184 
185 /**
186  * Extract stream types from a program stream map
187  * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
188  *
189  * @return number of bytes occupied by PSM in the bitstream
190  */
192 {
193  int psm_length, ps_info_length, es_map_length;
194 
195  psm_length = avio_rb16(pb);
196  avio_r8(pb);
197  avio_r8(pb);
198  ps_info_length = avio_rb16(pb);
199 
200  /* skip program_stream_info */
201  avio_skip(pb, ps_info_length);
202  /*es_map_length = */avio_rb16(pb);
203  /* Ignore es_map_length, trust psm_length */
204  es_map_length = psm_length - ps_info_length - 10;
205 
206  /* at least one es available? */
207  while (es_map_length >= 4) {
208  unsigned char type = avio_r8(pb);
209  unsigned char es_id = avio_r8(pb);
210  uint16_t es_info_length = avio_rb16(pb);
211 
212  /* remember mapping from stream id to stream type */
213  m->psm_es_type[es_id] = type;
214  /* skip program_stream_info */
215  avio_skip(pb, es_info_length);
216  es_map_length -= 4 + es_info_length;
217  }
218  avio_rb32(pb); /* crc32 */
219  return 2 + psm_length;
220 }
221 
222 /* read the next PES header. Return its position in ppos
223  * (if not NULL), and its start code, pts and dts.
224  */
226  int64_t *ppos, int *pstart_code,
227  int64_t *ppts, int64_t *pdts)
228 {
229  MpegDemuxContext *m = s->priv_data;
230  int len, size, startcode, c, flags, header_len;
231  int pes_ext, ext2_len, id_ext, skip;
232  int64_t pts, dts;
233  int64_t last_sync = avio_tell(s->pb);
234 
235 error_redo:
236  avio_seek(s->pb, last_sync, SEEK_SET);
237 redo:
238  /* next start code (should be immediately after) */
239  m->header_state = 0xff;
240  size = MAX_SYNC_SIZE;
241  startcode = find_next_start_code(s->pb, &size, &m->header_state);
242  last_sync = avio_tell(s->pb);
243  if (startcode < 0) {
244  if (avio_feof(s->pb))
245  return AVERROR_EOF;
246  // FIXME we should remember header_state
247  return FFERROR_REDO;
248  }
249 
250  if (startcode == PACK_START_CODE)
251  goto redo;
252  if (startcode == SYSTEM_HEADER_START_CODE)
253  goto redo;
254  if (startcode == PADDING_STREAM) {
255  avio_skip(s->pb, avio_rb16(s->pb));
256  goto redo;
257  }
258  if (startcode == PRIVATE_STREAM_2) {
259  if (!m->sofdec) {
260  /* Need to detect whether this from a DVD or a 'Sofdec' stream */
261  int len = avio_rb16(s->pb);
262  int bytesread = 0;
263  uint8_t *ps2buf = av_malloc(len);
264 
265  if (ps2buf) {
266  bytesread = avio_read(s->pb, ps2buf, len);
267 
268  if (bytesread != len) {
269  avio_skip(s->pb, len - bytesread);
270  } else {
271  uint8_t *p = 0;
272  if (len >= 6)
273  p = memchr(ps2buf, 'S', len - 5);
274 
275  if (p)
276  m->sofdec = !memcmp(p+1, "ofdec", 5);
277 
278  m->sofdec -= !m->sofdec;
279 
280  if (m->sofdec < 0) {
281  if (len == 980 && ps2buf[0] == 0) {
282  /* PCI structure? */
283  uint32_t startpts = AV_RB32(ps2buf + 0x0d);
284  uint32_t endpts = AV_RB32(ps2buf + 0x11);
285  uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
286  uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
287  uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
288 
289  m->dvd = (hours <= 23 &&
290  mins <= 59 &&
291  secs <= 59 &&
292  (ps2buf[0x19] & 0x0f) < 10 &&
293  (ps2buf[0x1a] & 0x0f) < 10 &&
294  (ps2buf[0x1b] & 0x0f) < 10 &&
295  endpts >= startpts);
296  } else if (len == 1018 && ps2buf[0] == 1) {
297  /* DSI structure? */
298  uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
299  uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
300  uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
301 
302  m->dvd = (hours <= 23 &&
303  mins <= 59 &&
304  secs <= 59 &&
305  (ps2buf[0x1d] & 0x0f) < 10 &&
306  (ps2buf[0x1e] & 0x0f) < 10 &&
307  (ps2buf[0x1f] & 0x0f) < 10);
308  }
309  }
310  }
311 
312  av_free(ps2buf);
313 
314  /* If this isn't a DVD packet or no memory
315  * could be allocated, just ignore it.
316  * If we did, move back to the start of the
317  * packet (plus 'length' field) */
318  if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
319  /* Skip back failed.
320  * This packet will be lost but that can't be helped
321  * if we can't skip back
322  */
323  goto redo;
324  }
325  } else {
326  /* No memory */
327  avio_skip(s->pb, len);
328  goto redo;
329  }
330  } else if (!m->dvd) {
331  int len = avio_rb16(s->pb);
332  avio_skip(s->pb, len);
333  goto redo;
334  }
335  }
336  if (startcode == PROGRAM_STREAM_MAP) {
337  mpegps_psm_parse(m, s->pb);
338  goto redo;
339  }
340 
341  /* find matching stream */
342  if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
343  (startcode >= 0x1e0 && startcode <= 0x1ef) ||
344  (startcode == 0x1bd) ||
345  (startcode == PRIVATE_STREAM_2) ||
346  (startcode == 0x1fd)))
347  goto redo;
348  if (ppos) {
349  *ppos = avio_tell(s->pb) - 4;
350  }
351  len = avio_rb16(s->pb);
352  pts =
353  dts = AV_NOPTS_VALUE;
354  if (startcode != PRIVATE_STREAM_2)
355  {
356  /* stuffing */
357  for (;;) {
358  if (len < 1)
359  goto error_redo;
360  c = avio_r8(s->pb);
361  len--;
362  /* XXX: for MPEG-1, should test only bit 7 */
363  if (c != 0xff)
364  break;
365  }
366  if ((c & 0xc0) == 0x40) {
367  /* buffer scale & size */
368  avio_r8(s->pb);
369  c = avio_r8(s->pb);
370  len -= 2;
371  }
372  if ((c & 0xe0) == 0x20) {
373  dts =
374  pts = get_pts(s->pb, c);
375  len -= 4;
376  if (c & 0x10) {
377  dts = get_pts(s->pb, -1);
378  len -= 5;
379  }
380  } else if ((c & 0xc0) == 0x80) {
381  /* mpeg 2 PES */
382  flags = avio_r8(s->pb);
383  header_len = avio_r8(s->pb);
384  len -= 2;
385  if (header_len > len)
386  goto error_redo;
387  len -= header_len;
388  if (flags & 0x80) {
389  dts = pts = get_pts(s->pb, -1);
390  header_len -= 5;
391  if (flags & 0x40) {
392  dts = get_pts(s->pb, -1);
393  header_len -= 5;
394  }
395  }
396  if (flags & 0x3f && header_len == 0) {
397  flags &= 0xC0;
398  av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
399  }
400  if (flags & 0x01) { /* PES extension */
401  pes_ext = avio_r8(s->pb);
402  header_len--;
403  /* Skip PES private data, program packet sequence counter
404  * and P-STD buffer */
405  skip = (pes_ext >> 4) & 0xb;
406  skip += skip & 0x9;
407  if (pes_ext & 0x40 || skip > header_len) {
408  av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
409  pes_ext = skip = 0;
410  }
411  avio_skip(s->pb, skip);
412  header_len -= skip;
413 
414  if (pes_ext & 0x01) { /* PES extension 2 */
415  ext2_len = avio_r8(s->pb);
416  header_len--;
417  if ((ext2_len & 0x7f) > 0) {
418  id_ext = avio_r8(s->pb);
419  if ((id_ext & 0x80) == 0)
420  startcode = ((startcode & 0xff) << 8) | id_ext;
421  header_len--;
422  }
423  }
424  }
425  if (header_len < 0)
426  goto error_redo;
427  avio_skip(s->pb, header_len);
428  } else if (c != 0xf)
429  goto redo;
430  }
431 
432  if (startcode == PRIVATE_STREAM_1) {
433  int ret = ffio_ensure_seekback(s->pb, 2);
434 
435  if (ret < 0)
436  return ret;
437 
438  startcode = avio_r8(s->pb);
439  m->raw_ac3 = 0;
440  if (startcode == 0x0b) {
441  if (avio_r8(s->pb) == 0x77) {
442  startcode = 0x80;
443  m->raw_ac3 = 1;
444  avio_skip(s->pb, -2);
445  } else {
446  avio_skip(s->pb, -1);
447  }
448  } else {
449  len--;
450  }
451  }
452  if (len < 0)
453  goto error_redo;
454  if (dts != AV_NOPTS_VALUE && ppos) {
455  int i;
456  for (i = 0; i < s->nb_streams; i++) {
457  if (startcode == s->streams[i]->id &&
458  (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
459  ff_reduce_index(s, i);
460  av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
461  AVINDEX_KEYFRAME /* FIXME keyframe? */);
462  }
463  }
464  }
465 
466  *pstart_code = startcode;
467  *ppts = pts;
468  *pdts = dts;
469  return len;
470 }
471 
473  AVPacket *pkt)
474 {
475  MpegDemuxContext *m = s->priv_data;
476  AVStream *st;
477  int len, startcode, i, es_type, ret;
478  int pcm_dvd = 0;
479  int request_probe= 0;
481  enum AVMediaType type;
482  int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
483 
484 redo:
485  len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
486  if (len < 0)
487  return len;
488 
489  if (startcode >= 0x80 && startcode <= 0xcf) {
490  if (len < 4)
491  goto skip;
492 
493  if (!m->raw_ac3) {
494  /* audio: skip header */
495  avio_skip(s->pb, 3);
496  len -= 3;
497  if (startcode >= 0xb0 && startcode <= 0xbf) {
498  /* MLP/TrueHD audio has a 4-byte header */
499  avio_r8(s->pb);
500  len--;
501  } else if (startcode >= 0xa0 && startcode <= 0xaf) {
502  ret = ffio_ensure_seekback(s->pb, 3);
503  if (ret < 0)
504  return ret;
505  pcm_dvd = (avio_rb24(s->pb) & 0xFF) == 0x80;
506  avio_skip(s->pb, -3);
507  }
508  }
509  }
510 
511  /* now find stream */
512  for (i = 0; i < s->nb_streams; i++) {
513  st = s->streams[i];
514  if (st->id == startcode)
515  goto found;
516  }
517 
518  es_type = m->psm_es_type[startcode & 0xff];
519  if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
520  codec_id = AV_CODEC_ID_MPEG2VIDEO;
521  type = AVMEDIA_TYPE_VIDEO;
522  } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
523  codec_id = AV_CODEC_ID_MPEG2VIDEO;
524  type = AVMEDIA_TYPE_VIDEO;
525  } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
526  es_type == STREAM_TYPE_AUDIO_MPEG2) {
527  codec_id = AV_CODEC_ID_MP3;
528  type = AVMEDIA_TYPE_AUDIO;
529  } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
530  codec_id = AV_CODEC_ID_AAC;
531  type = AVMEDIA_TYPE_AUDIO;
532  } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
533  codec_id = AV_CODEC_ID_MPEG4;
534  type = AVMEDIA_TYPE_VIDEO;
535  } else if (es_type == STREAM_TYPE_VIDEO_H264) {
536  codec_id = AV_CODEC_ID_H264;
537  type = AVMEDIA_TYPE_VIDEO;
538  } else if (es_type == STREAM_TYPE_VIDEO_HEVC) {
539  codec_id = AV_CODEC_ID_HEVC;
540  type = AVMEDIA_TYPE_VIDEO;
541  } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
542  codec_id = AV_CODEC_ID_AC3;
543  type = AVMEDIA_TYPE_AUDIO;
544  } else if (m->imkh_cctv && es_type == 0x91) {
545  codec_id = AV_CODEC_ID_PCM_MULAW;
546  type = AVMEDIA_TYPE_AUDIO;
547  } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
548  static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
549  unsigned char buf[8];
550 
551  avio_read(s->pb, buf, 8);
552  avio_seek(s->pb, -8, SEEK_CUR);
553  if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
554  codec_id = AV_CODEC_ID_CAVS;
555  else
556  request_probe= 1;
557  type = AVMEDIA_TYPE_VIDEO;
558  } else if (startcode == PRIVATE_STREAM_2) {
559  type = AVMEDIA_TYPE_DATA;
560  codec_id = AV_CODEC_ID_DVD_NAV;
561  } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
562  type = AVMEDIA_TYPE_AUDIO;
563  if (m->sofdec > 0) {
564  codec_id = AV_CODEC_ID_ADPCM_ADX;
565  // Auto-detect AC-3
566  request_probe = 50;
567  } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
568  codec_id = AV_CODEC_ID_PCM_ALAW;
569  request_probe = 50;
570  } else {
571  codec_id = AV_CODEC_ID_MP2;
572  if (m->imkh_cctv)
573  request_probe = 25;
574  }
575  } else if (startcode >= 0x80 && startcode <= 0x87) {
576  type = AVMEDIA_TYPE_AUDIO;
577  codec_id = AV_CODEC_ID_AC3;
578  } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
579  (startcode >= 0x98 && startcode <= 0x9f)) {
580  /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
581  type = AVMEDIA_TYPE_AUDIO;
582  codec_id = AV_CODEC_ID_DTS;
583  } else if (startcode >= 0xa0 && startcode <= 0xaf) {
584  type = AVMEDIA_TYPE_AUDIO;
585  if (!pcm_dvd) {
586  codec_id = AV_CODEC_ID_MLP;
587  } else {
588  codec_id = AV_CODEC_ID_PCM_DVD;
589  }
590  } else if (startcode >= 0xb0 && startcode <= 0xbf) {
591  type = AVMEDIA_TYPE_AUDIO;
592  codec_id = AV_CODEC_ID_TRUEHD;
593  } else if (startcode >= 0xc0 && startcode <= 0xcf) {
594  /* Used for both AC-3 and E-AC-3 in EVOB files */
595  type = AVMEDIA_TYPE_AUDIO;
596  codec_id = AV_CODEC_ID_AC3;
597  } else if (startcode >= 0x20 && startcode <= 0x3f) {
598  type = AVMEDIA_TYPE_SUBTITLE;
599  codec_id = AV_CODEC_ID_DVD_SUBTITLE;
600  } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
601  type = AVMEDIA_TYPE_VIDEO;
602  codec_id = AV_CODEC_ID_VC1;
603  } else {
604 skip:
605  /* skip packet */
606  avio_skip(s->pb, len);
607  goto redo;
608  }
609  /* no stream found: add a new stream */
610  st = avformat_new_stream(s, NULL);
611  if (!st)
612  goto skip;
613  st->id = startcode;
614  st->codecpar->codec_type = type;
615  st->codecpar->codec_id = codec_id;
618  st->codecpar->channels = 1;
620  st->codecpar->sample_rate = 8000;
621  }
622  st->request_probe = request_probe;
624 
625 found:
626  if (st->discard >= AVDISCARD_ALL)
627  goto skip;
628  if (startcode >= 0xa0 && startcode <= 0xaf) {
629  if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
630  if (len < 6)
631  goto skip;
632  avio_skip(s->pb, 6);
633  len -=6;
634  }
635  }
636  ret = av_get_packet(s->pb, pkt, len);
637 
638  pkt->pts = pts;
639  pkt->dts = dts;
640  pkt->pos = dummy_pos;
641  pkt->stream_index = st->index;
642 
643  if (s->debug & FF_FDEBUG_TS)
644  av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
645  pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
646  pkt->size);
647 
648  return (ret < 0) ? ret : 0;
649 }
650 
651 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
652  int64_t *ppos, int64_t pos_limit)
653 {
654  int len, startcode;
655  int64_t pos, pts, dts;
656 
657  pos = *ppos;
658  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
659  return AV_NOPTS_VALUE;
660 
661  for (;;) {
662  len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
663  if (len < 0) {
664  if (s->debug & FF_FDEBUG_TS)
665  av_log(s, AV_LOG_DEBUG, "none (ret=%d)\n", len);
666  return AV_NOPTS_VALUE;
667  }
668  if (startcode == s->streams[stream_index]->id &&
669  dts != AV_NOPTS_VALUE) {
670  break;
671  }
672  avio_skip(s->pb, len);
673  }
674  if (s->debug & FF_FDEBUG_TS)
675  av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
676  pos, dts, dts / 90000.0);
677  *ppos = pos;
678  return dts;
679 }
680 
682  .name = "mpeg",
683  .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
684  .priv_data_size = sizeof(MpegDemuxContext),
688  .read_timestamp = mpegps_read_dts,
690 };
691 
692 #if CONFIG_VOBSUB_DEMUXER
693 
694 #include "subtitles.h"
695 #include "libavutil/avassert.h"
696 #include "libavutil/bprint.h"
697 #include "libavutil/opt.h"
698 
699 #define REF_STRING "# VobSub index file,"
700 #define MAX_LINE_SIZE 2048
701 
702 typedef struct VobSubDemuxContext {
703  const AVClass *class;
704  AVFormatContext *sub_ctx;
705  FFDemuxSubtitlesQueue q[32];
706  char *sub_name;
707 } VobSubDemuxContext;
708 
709 static int vobsub_probe(const AVProbeData *p)
710 {
711  if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
712  return AVPROBE_SCORE_MAX;
713  return 0;
714 }
715 
716 static int vobsub_read_close(AVFormatContext *s)
717 {
718  VobSubDemuxContext *vobsub = s->priv_data;
719  int i;
720 
721  for (i = 0; i < s->nb_streams; i++)
722  ff_subtitles_queue_clean(&vobsub->q[i]);
723  if (vobsub->sub_ctx)
724  avformat_close_input(&vobsub->sub_ctx);
725  return 0;
726 }
727 
728 static int vobsub_read_header(AVFormatContext *s)
729 {
730  int i, ret = 0, header_parsed = 0, langidx = 0;
731  VobSubDemuxContext *vobsub = s->priv_data;
732  size_t fname_len;
733  AVBPrint header;
734  int64_t delay = 0;
735  AVStream *st = NULL;
736  int stream_id = -1;
737  char id[64] = {0};
738  char alt[MAX_LINE_SIZE] = {0};
740 
741  if (!vobsub->sub_name) {
742  char *ext;
743  vobsub->sub_name = av_strdup(s->url);
744  if (!vobsub->sub_name) {
745  return AVERROR(ENOMEM);
746  }
747 
748  fname_len = strlen(vobsub->sub_name);
749  ext = vobsub->sub_name - 3 + fname_len;
750  if (fname_len < 4 || *(ext - 1) != '.') {
751  av_log(s, AV_LOG_ERROR, "The input index filename is too short "
752  "to guess the associated .SUB file\n");
753  return AVERROR_INVALIDDATA;
754  }
755  memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
756  av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name);
757  }
758 
759  if (!(iformat = av_find_input_format("mpeg"))) {
761  }
762 
763  vobsub->sub_ctx = avformat_alloc_context();
764  if (!vobsub->sub_ctx) {
765  return AVERROR(ENOMEM);
766  }
767 
768  av_bprint_init(&header, 0, INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
769 
770  if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
771  goto end;
772 
773  ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
774  if (ret < 0) {
775  av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
776  goto end;
777  }
778 
779  while (!avio_feof(s->pb)) {
780  char line[MAX_LINE_SIZE];
781  int len = ff_get_line(s->pb, line, sizeof(line));
782 
783  if (!len)
784  break;
785 
786  line[strcspn(line, "\r\n")] = 0;
787 
788  if (!strncmp(line, "id:", 3)) {
789  if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
790  av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
791  "assuming 'id: und, index: 0'\n", line);
792  strcpy(id, "und");
793  stream_id = 0;
794  }
795 
796  if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
797  av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
798  ret = AVERROR(EINVAL);
799  goto end;
800  }
801 
802  header_parsed = 1;
803  alt[0] = '\0';
804  /* We do not create the stream immediately to avoid adding empty
805  * streams. See the following timestamp entry. */
806 
807  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
808 
809  } else if (!strncmp(line, "timestamp:", 10)) {
810  AVPacket *sub;
811  int hh, mm, ss, ms;
812  int64_t pos, timestamp;
813  const char *p = line + 10;
814 
815  if (stream_id == -1) {
816  av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
817  ret = AVERROR_INVALIDDATA;
818  goto end;
819  }
820 
821  if (!st || st->id != stream_id) {
822  st = avformat_new_stream(s, NULL);
823  if (!st) {
824  ret = AVERROR(ENOMEM);
825  goto end;
826  }
827  st->id = stream_id;
830  avpriv_set_pts_info(st, 64, 1, 1000);
831  av_dict_set(&st->metadata, "language", id, 0);
832  if (alt[0])
833  av_dict_set(&st->metadata, "title", alt, 0);
834  }
835 
836  if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
837  &hh, &mm, &ss, &ms, &pos) != 5) {
838  av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
839  "abort parsing\n", line);
840  ret = AVERROR_INVALIDDATA;
841  goto end;
842  }
843  timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
844  timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
845 
846  sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
847  if (!sub) {
848  ret = AVERROR(ENOMEM);
849  goto end;
850  }
851  sub->pos = pos;
852  sub->pts = timestamp;
853  sub->stream_index = s->nb_streams - 1;
854 
855  } else if (!strncmp(line, "alt:", 4)) {
856  const char *p = line + 4;
857 
858  while (*p == ' ')
859  p++;
860  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
861  av_strlcpy(alt, p, sizeof(alt));
862  header_parsed = 1;
863 
864  } else if (!strncmp(line, "delay:", 6)) {
865  int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
866  const char *p = line + 6;
867 
868  while (*p == ' ')
869  p++;
870  if (*p == '-' || *p == '+') {
871  sign = *p == '-' ? -1 : 1;
872  p++;
873  }
874  sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
875  delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
876 
877  } else if (!strncmp(line, "langidx:", 8)) {
878  const char *p = line + 8;
879 
880  if (sscanf(p, "%d", &langidx) != 1)
881  av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
882 
883  } else if (!header_parsed) {
884  if (line[0] && line[0] != '#')
885  av_bprintf(&header, "%s\n", line);
886  }
887  }
888 
889  if (langidx < s->nb_streams)
891 
892  for (i = 0; i < s->nb_streams; i++) {
893  vobsub->q[i].sort = SUB_SORT_POS_TS;
894  vobsub->q[i].keep_duplicates = 1;
895  ff_subtitles_queue_finalize(s, &vobsub->q[i]);
896  }
897 
898  if (!av_bprint_is_complete(&header)) {
899  ret = AVERROR(ENOMEM);
900  goto end;
901  }
902  for (i = 0; i < s->nb_streams; i++) {
903  AVCodecParameters *par = s->streams[i]->codecpar;
904  ret = ff_alloc_extradata(par, header.len);
905  if (ret < 0) {
906  goto end;
907  }
908  memcpy(par->extradata, header.str, header.len);
909  }
910 end:
911  if (ret < 0)
912  vobsub_read_close(s);
913  av_bprint_finalize(&header, NULL);
914  return ret;
915 }
916 
917 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
918 {
919  VobSubDemuxContext *vobsub = s->priv_data;
921  AVIOContext *pb = vobsub->sub_ctx->pb;
922  int ret, psize, total_read = 0, i;
923 
924  int64_t min_ts = INT64_MAX;
925  int sid = 0;
926  for (i = 0; i < s->nb_streams; i++) {
927  FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
928  int64_t ts;
929  av_assert0(tmpq->nb_subs);
930 
931  if (tmpq->current_sub_idx >= tmpq->nb_subs)
932  continue;
933 
934  ts = tmpq->subs[tmpq->current_sub_idx].pts;
935  if (ts < min_ts) {
936  min_ts = ts;
937  sid = i;
938  }
939  }
940  q = &vobsub->q[sid];
941  /* The returned packet will have size zero,
942  * so that it can be directly used with av_grow_packet. */
943  ret = ff_subtitles_queue_read_packet(q, pkt);
944  if (ret < 0)
945  return ret;
946 
947  /* compute maximum packet size using the next packet position. This is
948  * useful when the len in the header is non-sense */
949  if (q->current_sub_idx < q->nb_subs) {
950  psize = q->subs[q->current_sub_idx].pos - pkt->pos;
951  } else {
952  int64_t fsize = avio_size(pb);
953  psize = fsize < 0 ? 0xffff : fsize - pkt->pos;
954  }
955 
956  avio_seek(pb, pkt->pos, SEEK_SET);
957 
958  do {
959  int n, to_read, startcode;
960  int64_t pts, dts;
961  int64_t old_pos = avio_tell(pb), new_pos;
962  int pkt_size;
963 
964  ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
965  if (ret < 0) {
966  if (pkt->size) // raise packet even if incomplete
967  break;
968  return ret;
969  }
970  to_read = ret & 0xffff;
971  new_pos = avio_tell(pb);
972  pkt_size = ret + (new_pos - old_pos);
973 
974  /* this prevents reads above the current packet */
975  if (total_read + pkt_size > psize)
976  break;
977  total_read += pkt_size;
978 
979  /* the current chunk doesn't match the stream index (unlikely) */
980  if ((startcode & 0x1f) != s->streams[pkt->stream_index]->id)
981  break;
982 
983  ret = av_grow_packet(pkt, to_read);
984  if (ret < 0)
985  return ret;
986 
987  n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
988  if (n < to_read)
989  pkt->size -= to_read - n;
990  } while (total_read < psize);
991 
992  return 0;
993 }
994 
995 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
996  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
997 {
998  VobSubDemuxContext *vobsub = s->priv_data;
999 
1000  /* Rescale requested timestamps based on the first stream (timebase is the
1001  * same for all subtitles stream within a .idx/.sub). Rescaling is done just
1002  * like in avformat_seek_file(). */
1003  if (stream_index == -1 && s->nb_streams != 1) {
1004  int i, ret = 0;
1005  AVRational time_base = s->streams[0]->time_base;
1006  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
1007  min_ts = av_rescale_rnd(min_ts, time_base.den,
1008  time_base.num * (int64_t)AV_TIME_BASE,
1010  max_ts = av_rescale_rnd(max_ts, time_base.den,
1011  time_base.num * (int64_t)AV_TIME_BASE,
1013  for (i = 0; i < s->nb_streams; i++) {
1014  int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
1015  min_ts, ts, max_ts, flags);
1016  if (r < 0)
1017  ret = r;
1018  }
1019  return ret;
1020  }
1021 
1022  if (stream_index == -1) // only 1 stream
1023  stream_index = 0;
1024  return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1025  min_ts, ts, max_ts, flags);
1026 }
1027 
1028 static const AVOption options[] = {
1029  { "sub_name", "URI for .sub file", offsetof(VobSubDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1030  { NULL }
1031 };
1032 
1033 static const AVClass vobsub_demuxer_class = {
1034  .class_name = "vobsub",
1035  .item_name = av_default_item_name,
1036  .option = options,
1037  .version = LIBAVUTIL_VERSION_INT,
1038 };
1039 
1041  .name = "vobsub",
1042  .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1043  .priv_data_size = sizeof(VobSubDemuxContext),
1044  .read_probe = vobsub_probe,
1045  .read_header = vobsub_read_header,
1046  .read_packet = vobsub_read_packet,
1047  .read_seek2 = vobsub_read_seek,
1048  .read_close = vobsub_read_close,
1049  .flags = AVFMT_SHOW_IDS,
1050  .extensions = "idx",
1051  .priv_class = &vobsub_demuxer_class,
1052 };
1053 #endif
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#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:334
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
static struct @314 state
int size
if(ret< 0)
Definition: vf_mcdeint.c:279
#define STREAM_TYPE_AUDIO_MPEG2
Definition: mpeg.h:52
AVOption.
Definition: opt.h:246
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:2045
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:375
#define VIDEO_ID
Definition: mpeg.h:42
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:4938
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:159
#define MAX_SYNC_SIZE
Definition: mpeg.c:30
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:877
int size
Definition: packet.h:356
#define PACK_START_CODE
Definition: mpeg.h:28
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:302
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:533
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
sort by position, then timestamps
Definition: subtitles.h:31
static int mpegps_read_pes_header(AVFormatContext *s, int64_t *ppos, int *pstart_code, int64_t *ppts, int64_t *pdts)
Definition: mpeg.c:225
#define STREAM_TYPE_VIDEO_MPEG1
Definition: mpeg.h:49
discard all
Definition: avcodec.h:236
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:763
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1400
static int mpegps_read_header(AVFormatContext *s)
Definition: mpeg.c:126
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
#define AVFMT_SHOW_IDS
Show format stream IDs numbers.
Definition: avformat.h:460
Format I/O context.
Definition: avformat.h:1351
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 av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
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:1973
static char buffer[20]
Definition: seek.c:32
uint8_t
Round toward +infinity.
Definition: mathematics.h:83
static int nb_streams
Definition: ffprobe.c:282
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:203
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1295
AVOptions.
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:212
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:778
#define AV_RB32
Definition: intreadwrite.h:130
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
enum AVStreamParseType need_parsing
Definition: avformat.h:1094
int id
Format-specific stream ID.
Definition: avformat.h:883
#define STREAM_TYPE_VIDEO_HEVC
Definition: mpeg.h:58
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4519
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data)...
Definition: internal.h:633
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define SYSTEM_HEADER_START_CODE
Definition: mpeg.h:29
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:144
uint8_t * data
Definition: packet.h:355
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define PRIVATE_STREAM_1
Definition: mpeg.h:37
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
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:304
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static const uint8_t header[24]
Definition: sdr2.c:67
static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpeg.c:651
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
#define STREAM_TYPE_AUDIO_AAC
Definition: mpeg.h:55
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
#define ff_const59
The ff_const59 define is not part of the public API and will be removed without further warning...
Definition: avformat.h:544
#define AVINDEX_KEYFRAME
Definition: avformat.h:812
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define PRIVATE_STREAM_2
Definition: mpeg.h:39
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:464
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const uint8_t * code
Definition: spdifenc.c:411
#define MAX_LINE_SIZE
Definition: vf_lut3d.c:483
static int check_pack_header(const uint8_t *buf)
Definition: mpeg.c:54
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
char * url
input or output URL.
Definition: avformat.h:1447
const char * r
Definition: vf_curves.c:114
unsigned int pos
Definition: spdifenc.c:410
#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: codec_id.h:411
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
#define PADDING_STREAM
Definition: mpeg.h:38
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
Definition: graph2dot.c:48
simple assert() macros that are a bit more flexible than ISO C assert().
static int64_t ff_parse_pes_pts(const uint8_t *buf)
Parse MPEG-PES five-byte timestamp.
Definition: mpeg.h:68
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 avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
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
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
#define ss(width, name, subs,...)
Definition: cbs_vp9.c:261
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
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:3321
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:771
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
#define STREAM_TYPE_VIDEO_H264
Definition: mpeg.h:57
static int mpegps_probe(const AVProbeData *p)
Definition: mpeg.c:59
static int find_next_start_code(AVIOContext *pb, int *size_ptr, int32_t *header_state)
Definition: mpeg.c:157
static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
Extract stream types from a program stream map According to ISO/IEC 13818-1 (&#39;MPEG-2 Systems&#39;) table ...
Definition: mpeg.c:191
int32_t
#define AUDIO_ID
Definition: mpeg.h:41
#define s(width, name)
Definition: cbs_vp9.c:257
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
AVDictionary * metadata
Definition: avformat.h:940
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:786
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
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
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:51
#define FF_ARRAY_ELEMS(a)
#define STREAM_TYPE_VIDEO_MPEG4
Definition: mpeg.h:56
unsigned char psm_es_type[256]
Definition: mpeg.c:119
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int imkh_cctv
Definition: mpeg.c:122
int32_t header_state
Definition: mpeg.c:118
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
#define AV_DISPOSITION_DEFAULT
Definition: avformat.h:821
#define FF_FDEBUG_TS
Definition: avformat.h:1635
static AVInputFormat * iformat
Definition: ffprobe.c:259
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:250
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:255
int debug
Flags to enable debugging.
Definition: avformat.h:1634
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
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
Describe the class of an AVClass context structure.
Definition: log.h:67
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:277
#define PROGRAM_STREAM_MAP
Definition: mpeg.h:36
cl_device_type type
AVMediaType
Definition: avutil.h:199
#define STREAM_TYPE_AUDIO_AC3
Definition: mpeg.h:61
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
Round toward -infinity.
Definition: mathematics.h:82
static int64_t get_pts(AVIOContext *pb, int c)
Definition: mpeg.c:147
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:564
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
#define AVERROR_DEMUXER_NOT_FOUND
Demuxer not found.
Definition: error.h:53
static int mpegps_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpeg.c:472
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:982
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
full parsing and repack
Definition: avformat.h:795
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3388
static double c[64]
AVPacket * subs
array of subtitles packets
Definition: subtitles.h:103
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:929
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:111
int current_sub_idx
current position for the read packet callback
Definition: subtitles.h:106
int den
Denominator.
Definition: rational.h:60
static int check_pes(const uint8_t *p, const uint8_t *end)
Definition: mpeg.c:32
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4491
#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
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
Definition: mathematics.h:108
#define xf(width, name, var, range_min, range_max, subs,...)
Definition: cbs_av1.c:667
#define av_free(p)
int len
#define STREAM_TYPE_VIDEO_MPEG2
Definition: mpeg.h:50
void * priv_data
Format private data.
Definition: avformat.h:1379
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
int channels
Audio only.
Definition: codec_par.h:166
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:354
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:857
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
int stream_index
Definition: packet.h:357
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
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:905
#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:931
#define STREAM_TYPE_AUDIO_MPEG1
Definition: mpeg.h:51
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1133
static double val(void *priv, double ch)
Definition: aeval.c:76
This structure stores compressed data.
Definition: packet.h:332
int nb_subs
number of subtitles packets
Definition: subtitles.h:104
AVInputFormat ff_vobsub_demuxer
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:194
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AVInputFormat ff_mpegps_demuxer
Definition: mpeg.c:681