FFmpeg  3.4.9
mpeg.c
Go to the documentation of this file.
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 "internal.h"
24 #include "mpeg.h"
25 
26 #if CONFIG_VOBSUB_DEMUXER
27 # include "subtitles.h"
28 # include "libavutil/bprint.h"
29 # include "libavutil/opt.h"
30 #endif
31 
32 #include "libavutil/avassert.h"
33 
34 /*********************************************/
35 /* demux code */
36 
37 #define MAX_SYNC_SIZE 100000
38 
39 static int check_pes(const uint8_t *p, const uint8_t *end)
40 {
41  int pes1;
42  int pes2 = (p[3] & 0xC0) == 0x80 &&
43  (p[4] & 0xC0) != 0x40 &&
44  ((p[4] & 0xC0) == 0x00 ||
45  (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
46 
47  for (p += 3; p < end && *p == 0xFF; p++) ;
48  if ((*p & 0xC0) == 0x40)
49  p += 2;
50 
51  if ((*p & 0xF0) == 0x20)
52  pes1 = p[0] & p[2] & p[4] & 1;
53  else if ((*p & 0xF0) == 0x30)
54  pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
55  else
56  pes1 = *p == 0x0F;
57 
58  return pes1 || pes2;
59 }
60 
61 static int check_pack_header(const uint8_t *buf)
62 {
63  return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
64 }
65 
66 static int mpegps_probe(AVProbeData *p)
67 {
68  uint32_t code = -1;
69  int i;
70  int sys = 0, pspack = 0, priv1 = 0, vid = 0;
71  int audio = 0, invalid = 0, score = 0;
72  int endpes = 0;
73 
74  for (i = 0; i < p->buf_size; i++) {
75  code = (code << 8) + p->buf[i];
76  if ((code & 0xffffff00) == 0x100) {
77  int len = p->buf[i + 1] << 8 | p->buf[i + 2];
78  int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
79  int pack = check_pack_header(p->buf + i);
80 
81  if (code == SYSTEM_HEADER_START_CODE)
82  sys++;
83  else if (code == PACK_START_CODE && pack)
84  pspack++;
85  else if ((code & 0xf0) == VIDEO_ID && pes) {
86  endpes = i + len;
87  vid++;
88  }
89  // skip pes payload to avoid start code emulation for private
90  // and audio streams
91  else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
92  else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
93  else if (code == 0x1fd && pes) vid++; //VC1
94 
95  else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
96  else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
97  else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
98  }
99  }
100 
101  if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
102  score = AVPROBE_SCORE_EXTENSION / 2;
103 
104 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
105 // vid, audio, sys, pspack, invalid, p->buf_size);
106 
107  if (sys > invalid && sys * 9 <= pspack * 10)
108  return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
109  : AVPROBE_SCORE_EXTENSION / 2 + (audio + vid + pspack > 1); // 1 more than mp3
110  if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
111  return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
112  : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
113  if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
114  !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
115  return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
117 
118  // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
119  // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
120  // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
121  return score;
122 }
123 
124 typedef struct MpegDemuxContext {
125  AVClass *class;
127  unsigned char psm_es_type[256];
128  int sofdec;
129  int dvd;
131 #if CONFIG_VOBSUB_DEMUXER
132  AVFormatContext *sub_ctx;
133  FFDemuxSubtitlesQueue q[32];
134  char *sub_name;
135 #endif
137 
139 {
140  MpegDemuxContext *m = s->priv_data;
141  char buffer[7] = { 0 };
142  int64_t last_pos = avio_tell(s->pb);
143 
144  m->header_state = 0xff;
146 
147  avio_get_str(s->pb, 6, buffer, sizeof(buffer));
148  if (!memcmp("IMKH", buffer, 4)) {
149  m->imkh_cctv = 1;
150  } else if (!memcmp("Sofdec", buffer, 6)) {
151  m->sofdec = 1;
152  } else
153  avio_seek(s->pb, last_pos, SEEK_SET);
154 
155  /* no need to do more */
156  return 0;
157 }
158 
159 static int64_t get_pts(AVIOContext *pb, int c)
160 {
161  uint8_t buf[5];
162  int ret;
163 
164  buf[0] = c < 0 ? avio_r8(pb) : c;
165  ret = avio_read(pb, buf + 1, 4);
166  if (ret < 4)
167  return AV_NOPTS_VALUE;
168 
169  return ff_parse_pes_pts(buf);
170 }
171 
172 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
174 {
175  unsigned int state, v;
176  int val, n;
177 
178  state = *header_state;
179  n = *size_ptr;
180  while (n > 0) {
181  if (avio_feof(pb))
182  break;
183  v = avio_r8(pb);
184  n--;
185  if (state == 0x000001) {
186  state = ((state << 8) | v) & 0xffffff;
187  val = state;
188  goto found;
189  }
190  state = ((state << 8) | v) & 0xffffff;
191  }
192  val = -1;
193 
194 found:
195  *header_state = state;
196  *size_ptr = n;
197  return val;
198 }
199 
200 /**
201  * Extract stream types from a program stream map
202  * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
203  *
204  * @return number of bytes occupied by PSM in the bitstream
205  */
207 {
208  int psm_length, ps_info_length, es_map_length;
209 
210  psm_length = avio_rb16(pb);
211  avio_r8(pb);
212  avio_r8(pb);
213  ps_info_length = avio_rb16(pb);
214 
215  /* skip program_stream_info */
216  avio_skip(pb, ps_info_length);
217  /*es_map_length = */avio_rb16(pb);
218  /* Ignore es_map_length, trust psm_length */
219  es_map_length = psm_length - ps_info_length - 10;
220 
221  /* at least one es available? */
222  while (es_map_length >= 4) {
223  unsigned char type = avio_r8(pb);
224  unsigned char es_id = avio_r8(pb);
225  uint16_t es_info_length = avio_rb16(pb);
226 
227  /* remember mapping from stream id to stream type */
228  m->psm_es_type[es_id] = type;
229  /* skip program_stream_info */
230  avio_skip(pb, es_info_length);
231  es_map_length -= 4 + es_info_length;
232  }
233  avio_rb32(pb); /* crc32 */
234  return 2 + psm_length;
235 }
236 
237 /* read the next PES header. Return its position in ppos
238  * (if not NULL), and its start code, pts and dts.
239  */
241  int64_t *ppos, int *pstart_code,
242  int64_t *ppts, int64_t *pdts)
243 {
244  MpegDemuxContext *m = s->priv_data;
245  int len, size, startcode, c, flags, header_len;
246  int pes_ext, ext2_len, id_ext, skip;
247  int64_t pts, dts;
248  int64_t last_sync = avio_tell(s->pb);
249 
250 error_redo:
251  avio_seek(s->pb, last_sync, SEEK_SET);
252 redo:
253  /* next start code (should be immediately after) */
254  m->header_state = 0xff;
255  size = MAX_SYNC_SIZE;
256  startcode = find_next_start_code(s->pb, &size, &m->header_state);
257  last_sync = avio_tell(s->pb);
258  if (startcode < 0) {
259  if (avio_feof(s->pb))
260  return AVERROR_EOF;
261  // FIXME we should remember header_state
262  return FFERROR_REDO;
263  }
264 
265  if (startcode == PACK_START_CODE)
266  goto redo;
267  if (startcode == SYSTEM_HEADER_START_CODE)
268  goto redo;
269  if (startcode == PADDING_STREAM) {
270  avio_skip(s->pb, avio_rb16(s->pb));
271  goto redo;
272  }
273  if (startcode == PRIVATE_STREAM_2) {
274  if (!m->sofdec) {
275  /* Need to detect whether this from a DVD or a 'Sofdec' stream */
276  int len = avio_rb16(s->pb);
277  int bytesread = 0;
278  uint8_t *ps2buf = av_malloc(len);
279 
280  if (ps2buf) {
281  bytesread = avio_read(s->pb, ps2buf, len);
282 
283  if (bytesread != len) {
284  avio_skip(s->pb, len - bytesread);
285  } else {
286  uint8_t *p = 0;
287  if (len >= 6)
288  p = memchr(ps2buf, 'S', len - 5);
289 
290  if (p)
291  m->sofdec = !memcmp(p+1, "ofdec", 5);
292 
293  m->sofdec -= !m->sofdec;
294 
295  if (m->sofdec < 0) {
296  if (len == 980 && ps2buf[0] == 0) {
297  /* PCI structure? */
298  uint32_t startpts = AV_RB32(ps2buf + 0x0d);
299  uint32_t endpts = AV_RB32(ps2buf + 0x11);
300  uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
301  uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
302  uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
303 
304  m->dvd = (hours <= 23 &&
305  mins <= 59 &&
306  secs <= 59 &&
307  (ps2buf[0x19] & 0x0f) < 10 &&
308  (ps2buf[0x1a] & 0x0f) < 10 &&
309  (ps2buf[0x1b] & 0x0f) < 10 &&
310  endpts >= startpts);
311  } else if (len == 1018 && ps2buf[0] == 1) {
312  /* DSI structure? */
313  uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
314  uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
315  uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
316 
317  m->dvd = (hours <= 23 &&
318  mins <= 59 &&
319  secs <= 59 &&
320  (ps2buf[0x1d] & 0x0f) < 10 &&
321  (ps2buf[0x1e] & 0x0f) < 10 &&
322  (ps2buf[0x1f] & 0x0f) < 10);
323  }
324  }
325  }
326 
327  av_free(ps2buf);
328 
329  /* If this isn't a DVD packet or no memory
330  * could be allocated, just ignore it.
331  * If we did, move back to the start of the
332  * packet (plus 'length' field) */
333  if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
334  /* Skip back failed.
335  * This packet will be lost but that can't be helped
336  * if we can't skip back
337  */
338  goto redo;
339  }
340  } else {
341  /* No memory */
342  avio_skip(s->pb, len);
343  goto redo;
344  }
345  } else if (!m->dvd) {
346  int len = avio_rb16(s->pb);
347  avio_skip(s->pb, len);
348  goto redo;
349  }
350  }
351  if (startcode == PROGRAM_STREAM_MAP) {
352  mpegps_psm_parse(m, s->pb);
353  goto redo;
354  }
355 
356  /* find matching stream */
357  if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
358  (startcode >= 0x1e0 && startcode <= 0x1ef) ||
359  (startcode == 0x1bd) ||
360  (startcode == PRIVATE_STREAM_2) ||
361  (startcode == 0x1fd)))
362  goto redo;
363  if (ppos) {
364  *ppos = avio_tell(s->pb) - 4;
365  }
366  len = avio_rb16(s->pb);
367  pts =
368  dts = AV_NOPTS_VALUE;
369  if (startcode != PRIVATE_STREAM_2)
370  {
371  /* stuffing */
372  for (;;) {
373  if (len < 1)
374  goto error_redo;
375  c = avio_r8(s->pb);
376  len--;
377  /* XXX: for MPEG-1, should test only bit 7 */
378  if (c != 0xff)
379  break;
380  }
381  if ((c & 0xc0) == 0x40) {
382  /* buffer scale & size */
383  avio_r8(s->pb);
384  c = avio_r8(s->pb);
385  len -= 2;
386  }
387  if ((c & 0xe0) == 0x20) {
388  dts =
389  pts = get_pts(s->pb, c);
390  len -= 4;
391  if (c & 0x10) {
392  dts = get_pts(s->pb, -1);
393  len -= 5;
394  }
395  } else if ((c & 0xc0) == 0x80) {
396  /* mpeg 2 PES */
397  flags = avio_r8(s->pb);
398  header_len = avio_r8(s->pb);
399  len -= 2;
400  if (header_len > len)
401  goto error_redo;
402  len -= header_len;
403  if (flags & 0x80) {
404  dts = pts = get_pts(s->pb, -1);
405  header_len -= 5;
406  if (flags & 0x40) {
407  dts = get_pts(s->pb, -1);
408  header_len -= 5;
409  }
410  }
411  if (flags & 0x3f && header_len == 0) {
412  flags &= 0xC0;
413  av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
414  }
415  if (flags & 0x01) { /* PES extension */
416  pes_ext = avio_r8(s->pb);
417  header_len--;
418  /* Skip PES private data, program packet sequence counter
419  * and P-STD buffer */
420  skip = (pes_ext >> 4) & 0xb;
421  skip += skip & 0x9;
422  if (pes_ext & 0x40 || skip > header_len) {
423  av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
424  pes_ext = skip = 0;
425  }
426  avio_skip(s->pb, skip);
427  header_len -= skip;
428 
429  if (pes_ext & 0x01) { /* PES extension 2 */
430  ext2_len = avio_r8(s->pb);
431  header_len--;
432  if ((ext2_len & 0x7f) > 0) {
433  id_ext = avio_r8(s->pb);
434  if ((id_ext & 0x80) == 0)
435  startcode = ((startcode & 0xff) << 8) | id_ext;
436  header_len--;
437  }
438  }
439  }
440  if (header_len < 0)
441  goto error_redo;
442  avio_skip(s->pb, header_len);
443  } else if (c != 0xf)
444  goto redo;
445  }
446 
447  if (startcode == PRIVATE_STREAM_1) {
448  startcode = avio_r8(s->pb);
449  len--;
450  }
451  if (len < 0)
452  goto error_redo;
453  if (dts != AV_NOPTS_VALUE && ppos) {
454  int i;
455  for (i = 0; i < s->nb_streams; i++) {
456  if (startcode == s->streams[i]->id &&
457  (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
458  ff_reduce_index(s, i);
459  av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
460  AVINDEX_KEYFRAME /* FIXME keyframe? */);
461  }
462  }
463  }
464 
465  *pstart_code = startcode;
466  *ppts = pts;
467  *pdts = dts;
468  return len;
469 }
470 
472  AVPacket *pkt)
473 {
474  MpegDemuxContext *m = s->priv_data;
475  AVStream *st;
476  int len, startcode, i, es_type, ret;
477  int lpcm_header_len = -1; //Init to suppress warning
478  int request_probe= 0;
480  enum AVMediaType type;
481  int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
482 
483 redo:
484  len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
485  if (len < 0)
486  return len;
487 
488  if (startcode >= 0x80 && startcode <= 0xcf) {
489  if (len < 4)
490  goto skip;
491 
492  /* audio: skip header */
493  avio_r8(s->pb);
494  lpcm_header_len = avio_rb16(s->pb);
495  len -= 3;
496  if (startcode >= 0xb0 && startcode <= 0xbf) {
497  /* MLP/TrueHD audio has a 4-byte header */
498  avio_r8(s->pb);
499  len--;
500  }
501  }
502 
503  /* now find stream */
504  for (i = 0; i < s->nb_streams; i++) {
505  st = s->streams[i];
506  if (st->id == startcode)
507  goto found;
508  }
509 
510  es_type = m->psm_es_type[startcode & 0xff];
511  if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
512  codec_id = AV_CODEC_ID_MPEG2VIDEO;
513  type = AVMEDIA_TYPE_VIDEO;
514  } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
515  codec_id = AV_CODEC_ID_MPEG2VIDEO;
516  type = AVMEDIA_TYPE_VIDEO;
517  } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
518  es_type == STREAM_TYPE_AUDIO_MPEG2) {
519  codec_id = AV_CODEC_ID_MP3;
520  type = AVMEDIA_TYPE_AUDIO;
521  } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
522  codec_id = AV_CODEC_ID_AAC;
523  type = AVMEDIA_TYPE_AUDIO;
524  } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
525  codec_id = AV_CODEC_ID_MPEG4;
526  type = AVMEDIA_TYPE_VIDEO;
527  } else if (es_type == STREAM_TYPE_VIDEO_H264) {
528  codec_id = AV_CODEC_ID_H264;
529  type = AVMEDIA_TYPE_VIDEO;
530  } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
531  codec_id = AV_CODEC_ID_AC3;
532  type = AVMEDIA_TYPE_AUDIO;
533  } else if (m->imkh_cctv && es_type == 0x91) {
534  codec_id = AV_CODEC_ID_PCM_MULAW;
535  type = AVMEDIA_TYPE_AUDIO;
536  } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
537  static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
538  unsigned char buf[8];
539 
540  avio_read(s->pb, buf, 8);
541  avio_seek(s->pb, -8, SEEK_CUR);
542  if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
543  codec_id = AV_CODEC_ID_CAVS;
544  else
545  request_probe= 1;
546  type = AVMEDIA_TYPE_VIDEO;
547  } else if (startcode == PRIVATE_STREAM_2) {
548  type = AVMEDIA_TYPE_DATA;
549  codec_id = AV_CODEC_ID_DVD_NAV;
550  } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
551  type = AVMEDIA_TYPE_AUDIO;
552  if (m->sofdec > 0) {
553  codec_id = AV_CODEC_ID_ADPCM_ADX;
554  // Auto-detect AC-3
555  request_probe = 50;
556  } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
557  codec_id = AV_CODEC_ID_PCM_ALAW;
558  request_probe = 50;
559  } else {
560  codec_id = AV_CODEC_ID_MP2;
561  if (m->imkh_cctv)
562  request_probe = 25;
563  }
564  } else if (startcode >= 0x80 && startcode <= 0x87) {
565  type = AVMEDIA_TYPE_AUDIO;
566  codec_id = AV_CODEC_ID_AC3;
567  } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
568  (startcode >= 0x98 && startcode <= 0x9f)) {
569  /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
570  type = AVMEDIA_TYPE_AUDIO;
571  codec_id = AV_CODEC_ID_DTS;
572  } else if (startcode >= 0xa0 && startcode <= 0xaf) {
573  type = AVMEDIA_TYPE_AUDIO;
574  if (lpcm_header_len == 6 || startcode == 0xa1) {
575  codec_id = AV_CODEC_ID_MLP;
576  } else {
577  codec_id = AV_CODEC_ID_PCM_DVD;
578  }
579  } else if (startcode >= 0xb0 && startcode <= 0xbf) {
580  type = AVMEDIA_TYPE_AUDIO;
581  codec_id = AV_CODEC_ID_TRUEHD;
582  } else if (startcode >= 0xc0 && startcode <= 0xcf) {
583  /* Used for both AC-3 and E-AC-3 in EVOB files */
584  type = AVMEDIA_TYPE_AUDIO;
585  codec_id = AV_CODEC_ID_AC3;
586  } else if (startcode >= 0x20 && startcode <= 0x3f) {
587  type = AVMEDIA_TYPE_SUBTITLE;
588  codec_id = AV_CODEC_ID_DVD_SUBTITLE;
589  } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
590  type = AVMEDIA_TYPE_VIDEO;
591  codec_id = AV_CODEC_ID_VC1;
592  } else {
593 skip:
594  /* skip packet */
595  avio_skip(s->pb, len);
596  goto redo;
597  }
598  /* no stream found: add a new stream */
599  st = avformat_new_stream(s, NULL);
600  if (!st)
601  goto skip;
602  st->id = startcode;
603  st->codecpar->codec_type = type;
604  st->codecpar->codec_id = codec_id;
607  st->codecpar->channels = 1;
609  st->codecpar->sample_rate = 8000;
610  }
611  st->request_probe = request_probe;
613 
614 found:
615  if (st->discard >= AVDISCARD_ALL)
616  goto skip;
617  if (startcode >= 0xa0 && startcode <= 0xaf) {
618  if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
619  if (len < 6)
620  goto skip;
621  avio_skip(s->pb, 6);
622  len -=6;
623  }
624  }
625  ret = av_get_packet(s->pb, pkt, len);
626 
627  pkt->pts = pts;
628  pkt->dts = dts;
629  pkt->pos = dummy_pos;
630  pkt->stream_index = st->index;
631 
632  if (s->debug & FF_FDEBUG_TS)
633  av_log(s, AV_LOG_TRACE, "%d: pts=%0.3f dts=%0.3f size=%d\n",
634  pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
635  pkt->size);
636 
637  return (ret < 0) ? ret : 0;
638 }
639 
640 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
641  int64_t *ppos, int64_t pos_limit)
642 {
643  int len, startcode;
644  int64_t pos, pts, dts;
645 
646  pos = *ppos;
647  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
648  return AV_NOPTS_VALUE;
649 
650  for (;;) {
651  len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
652  if (len < 0) {
653  if (s->debug & FF_FDEBUG_TS)
654  av_log(s, AV_LOG_TRACE, "none (ret=%d)\n", len);
655  return AV_NOPTS_VALUE;
656  }
657  if (startcode == s->streams[stream_index]->id &&
658  dts != AV_NOPTS_VALUE) {
659  break;
660  }
661  avio_skip(s->pb, len);
662  }
663  if (s->debug & FF_FDEBUG_TS)
664  av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
665  pos, dts, dts / 90000.0);
666  *ppos = pos;
667  return dts;
668 }
669 
671  .name = "mpeg",
672  .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
673  .priv_data_size = sizeof(MpegDemuxContext),
677  .read_timestamp = mpegps_read_dts,
679 };
680 
681 #if CONFIG_VOBSUB_DEMUXER
682 
683 #define REF_STRING "# VobSub index file,"
684 #define MAX_LINE_SIZE 2048
685 
686 static int vobsub_probe(AVProbeData *p)
687 {
688  if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
689  return AVPROBE_SCORE_MAX;
690  return 0;
691 }
692 
693 static int vobsub_read_header(AVFormatContext *s)
694 {
695  int i, ret = 0, header_parsed = 0, langidx = 0;
696  MpegDemuxContext *vobsub = s->priv_data;
697  size_t fname_len;
698  char *header_str;
699  AVBPrint header;
700  int64_t delay = 0;
701  AVStream *st = NULL;
702  int stream_id = -1;
703  char id[64] = {0};
704  char alt[MAX_LINE_SIZE] = {0};
706 
707  if (!vobsub->sub_name) {
708  char *ext;
709  vobsub->sub_name = av_strdup(s->filename);
710  if (!vobsub->sub_name) {
711  ret = AVERROR(ENOMEM);
712  goto end;
713  }
714 
715  fname_len = strlen(vobsub->sub_name);
716  ext = vobsub->sub_name - 3 + fname_len;
717  if (fname_len < 4 || *(ext - 1) != '.') {
718  av_log(s, AV_LOG_ERROR, "The input index filename is too short "
719  "to guess the associated .SUB file\n");
720  ret = AVERROR_INVALIDDATA;
721  goto end;
722  }
723  memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
724  av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, vobsub->sub_name);
725  }
726 
727  if (!(iformat = av_find_input_format("mpeg"))) {
729  goto end;
730  }
731 
732  vobsub->sub_ctx = avformat_alloc_context();
733  if (!vobsub->sub_ctx) {
734  ret = AVERROR(ENOMEM);
735  goto end;
736  }
737 
738  if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
739  goto end;
740 
741  ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
742  if (ret < 0) {
743  av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
744  goto end;
745  }
746 
748  while (!avio_feof(s->pb)) {
749  char line[MAX_LINE_SIZE];
750  int len = ff_get_line(s->pb, line, sizeof(line));
751 
752  if (!len)
753  break;
754 
755  line[strcspn(line, "\r\n")] = 0;
756 
757  if (!strncmp(line, "id:", 3)) {
758  if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
759  av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
760  "assuming 'id: und, index: 0'\n", line);
761  strcpy(id, "und");
762  stream_id = 0;
763  }
764 
765  if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
766  av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
767  ret = AVERROR(EINVAL);
768  goto end;
769  }
770 
771  header_parsed = 1;
772  alt[0] = '\0';
773  /* We do not create the stream immediately to avoid adding empty
774  * streams. See the following timestamp entry. */
775 
776  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
777 
778  } else if (!strncmp(line, "timestamp:", 10)) {
779  AVPacket *sub;
780  int hh, mm, ss, ms;
781  int64_t pos, timestamp;
782  const char *p = line + 10;
783 
784  if (stream_id == -1) {
785  av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
786  ret = AVERROR_INVALIDDATA;
787  goto end;
788  }
789 
790  if (!st || st->id != stream_id) {
791  st = avformat_new_stream(s, NULL);
792  if (!st) {
793  ret = AVERROR(ENOMEM);
794  goto end;
795  }
796  st->id = stream_id;
799  avpriv_set_pts_info(st, 64, 1, 1000);
800  av_dict_set(&st->metadata, "language", id, 0);
801  if (alt[0])
802  av_dict_set(&st->metadata, "title", alt, 0);
803  }
804 
805  if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
806  &hh, &mm, &ss, &ms, &pos) != 5) {
807  av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
808  "abort parsing\n", line);
809  ret = AVERROR_INVALIDDATA;
810  goto end;
811  }
812  timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
813  timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
814 
815  sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
816  if (!sub) {
817  ret = AVERROR(ENOMEM);
818  goto end;
819  }
820  sub->pos = pos;
821  sub->pts = timestamp;
822  sub->stream_index = s->nb_streams - 1;
823 
824  } else if (!strncmp(line, "alt:", 4)) {
825  const char *p = line + 4;
826 
827  while (*p == ' ')
828  p++;
829  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
830  av_strlcpy(alt, p, sizeof(alt));
831  header_parsed = 1;
832 
833  } else if (!strncmp(line, "delay:", 6)) {
834  int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
835  const char *p = line + 6;
836 
837  while (*p == ' ')
838  p++;
839  if (*p == '-' || *p == '+') {
840  sign = *p == '-' ? -1 : 1;
841  p++;
842  }
843  sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
844  delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
845 
846  } else if (!strncmp(line, "langidx:", 8)) {
847  const char *p = line + 8;
848 
849  if (sscanf(p, "%d", &langidx) != 1)
850  av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
851 
852  } else if (!header_parsed) {
853  if (line[0] && line[0] != '#')
854  av_bprintf(&header, "%s\n", line);
855  }
856  }
857 
858  if (langidx < s->nb_streams)
860 
861  for (i = 0; i < s->nb_streams; i++) {
862  vobsub->q[i].sort = SUB_SORT_POS_TS;
863  vobsub->q[i].keep_duplicates = 1;
864  ff_subtitles_queue_finalize(s, &vobsub->q[i]);
865  }
866 
867  if (!av_bprint_is_complete(&header)) {
868  av_bprint_finalize(&header, NULL);
869  ret = AVERROR(ENOMEM);
870  goto end;
871  }
872  av_bprint_finalize(&header, &header_str);
873  for (i = 0; i < s->nb_streams; i++) {
874  AVStream *sub_st = s->streams[i];
875  sub_st->codecpar->extradata = av_strdup(header_str);
876  sub_st->codecpar->extradata_size = header.len;
877  }
878  av_free(header_str);
879 
880 end:
881  return ret;
882 }
883 
884 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
885 {
886  MpegDemuxContext *vobsub = s->priv_data;
888  AVIOContext *pb = vobsub->sub_ctx->pb;
889  int ret, psize, total_read = 0, i;
890  AVPacket idx_pkt = { 0 };
891 
892  int64_t min_ts = INT64_MAX;
893  int sid = 0;
894  for (i = 0; i < s->nb_streams; i++) {
895  FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
896  int64_t ts;
897  av_assert0(tmpq->nb_subs);
898  ts = tmpq->subs[tmpq->current_sub_idx].pts;
899  if (ts < min_ts) {
900  min_ts = ts;
901  sid = i;
902  }
903  }
904  q = &vobsub->q[sid];
905  ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
906  if (ret < 0)
907  return ret;
908 
909  /* compute maximum packet size using the next packet position. This is
910  * useful when the len in the header is non-sense */
911  if (q->current_sub_idx < q->nb_subs) {
912  psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
913  } else {
914  int64_t fsize = avio_size(pb);
915  psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
916  }
917 
918  avio_seek(pb, idx_pkt.pos, SEEK_SET);
919 
920  av_init_packet(pkt);
921  pkt->size = 0;
922  pkt->data = NULL;
923 
924  do {
925  int n, to_read, startcode;
926  int64_t pts, dts;
927  int64_t old_pos = avio_tell(pb), new_pos;
928  int pkt_size;
929 
930  ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
931  if (ret < 0) {
932  if (pkt->size) // raise packet even if incomplete
933  break;
934  goto fail;
935  }
936  to_read = ret & 0xffff;
937  new_pos = avio_tell(pb);
938  pkt_size = ret + (new_pos - old_pos);
939 
940  /* this prevents reads above the current packet */
941  if (total_read + pkt_size > psize)
942  break;
943  total_read += pkt_size;
944 
945  /* the current chunk doesn't match the stream index (unlikely) */
946  if ((startcode & 0x1f) != s->streams[idx_pkt.stream_index]->id)
947  break;
948 
949  ret = av_grow_packet(pkt, to_read);
950  if (ret < 0)
951  goto fail;
952 
953  n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
954  if (n < to_read)
955  pkt->size -= to_read - n;
956  } while (total_read < psize);
957 
958  pkt->pts = pkt->dts = idx_pkt.pts;
959  pkt->pos = idx_pkt.pos;
960  pkt->stream_index = idx_pkt.stream_index;
961 
962  av_packet_unref(&idx_pkt);
963  return 0;
964 
965 fail:
966  av_packet_unref(pkt);
967  av_packet_unref(&idx_pkt);
968  return ret;
969 }
970 
971 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
972  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
973 {
974  MpegDemuxContext *vobsub = s->priv_data;
975 
976  /* Rescale requested timestamps based on the first stream (timebase is the
977  * same for all subtitles stream within a .idx/.sub). Rescaling is done just
978  * like in avformat_seek_file(). */
979  if (stream_index == -1 && s->nb_streams != 1) {
980  int i, ret = 0;
981  AVRational time_base = s->streams[0]->time_base;
982  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
983  min_ts = av_rescale_rnd(min_ts, time_base.den,
984  time_base.num * (int64_t)AV_TIME_BASE,
986  max_ts = av_rescale_rnd(max_ts, time_base.den,
987  time_base.num * (int64_t)AV_TIME_BASE,
989  for (i = 0; i < s->nb_streams; i++) {
990  int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
991  min_ts, ts, max_ts, flags);
992  if (r < 0)
993  ret = r;
994  }
995  return ret;
996  }
997 
998  if (stream_index == -1) // only 1 stream
999  stream_index = 0;
1000  return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1001  min_ts, ts, max_ts, flags);
1002 }
1003 
1004 static int vobsub_read_close(AVFormatContext *s)
1005 {
1006  int i;
1007  MpegDemuxContext *vobsub = s->priv_data;
1008 
1009  for (i = 0; i < s->nb_streams; i++)
1010  ff_subtitles_queue_clean(&vobsub->q[i]);
1011  if (vobsub->sub_ctx)
1012  avformat_close_input(&vobsub->sub_ctx);
1013  return 0;
1014 }
1015 
1016 static const AVOption options[] = {
1017  { "sub_name", "URI for .sub file", offsetof(MpegDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1018  { NULL }
1019 };
1020 
1021 static const AVClass vobsub_demuxer_class = {
1022  .class_name = "vobsub",
1023  .item_name = av_default_item_name,
1024  .option = options,
1025  .version = LIBAVUTIL_VERSION_INT,
1026 };
1027 
1028 AVInputFormat ff_vobsub_demuxer = {
1029  .name = "vobsub",
1030  .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1031  .priv_data_size = sizeof(MpegDemuxContext),
1032  .read_probe = vobsub_probe,
1033  .read_header = vobsub_read_header,
1034  .read_packet = vobsub_read_packet,
1035  .read_seek2 = vobsub_read_seek,
1036  .read_close = vobsub_read_close,
1037  .flags = AVFMT_SHOW_IDS,
1038  .extensions = "idx",
1039  .priv_class = &vobsub_demuxer_class,
1040 };
1041 #endif
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:771
const char * s
Definition: avisynth_c.h:768
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
int size
#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:1994
static struct @260 state
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:86
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1699
#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:4756
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:145
#define MAX_SYNC_SIZE
Definition: mpeg.c:37
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4152
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:890
int size
Definition: avcodec.h:1680
#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:244
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:301
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:240
#define STREAM_TYPE_VIDEO_MPEG1
Definition: mpeg.h:49
discard all
Definition: avcodec.h:830
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:774
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1398
static int mpegps_read_header(AVFormatContext *s)
Definition: mpeg.c:138
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:480
Format I/O context.
Definition: avformat.h:1349
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:1922
static char buffer[20]
Definition: seek.c:32
uint8_t
Round toward +infinity.
Definition: mathematics.h:83
static int nb_streams
Definition: ffprobe.c:276
#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:1302
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
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:789
#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:1081
int id
Format-specific stream ID.
Definition: avformat.h:896
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4383
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data)...
Definition: internal.h:607
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
#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: avcodec.h:1679
static int flags
Definition: log.c:57
#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:292
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:556
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:640
const OptionDef options[]
Definition: ffserver.c:3948
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4254
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:636
#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 AVINDEX_KEYFRAME
Definition: avformat.h:827
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:214
#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 AV_BPRINT_SIZE_UNLIMITED
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:488
av_default_item_name
#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:181
#define MAX_LINE_SIZE
Definition: vf_lut3d.c:249
static int check_pack_header(const uint8_t *buf)
Definition: mpeg.c:61
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:557
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4148
#define PADDING_STREAM
Definition: mpeg.h:38
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:67
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 fail()
Definition: checkasm.h:109
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:4170
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:627
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:464
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1405
AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
Definition: format.c:164
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:261
char filename[1024]
input or output filename
Definition: avformat.h:1425
#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 read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int find_next_start_code(AVIOContext *pb, int *size_ptr, int32_t *header_state)
Definition: mpeg.c:172
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:206
int32_t
#define AUDIO_ID
Definition: mpeg.h:41
int n
Definition: avisynth_c.h:684
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:961
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:797
enum AVCodecID codec_id
Definition: vaapi_decode.c:235
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
if(ret< 0)
Definition: vf_mcdeint.c:279
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:219
#define FF_ARRAY_ELEMS(a)
#define STREAM_TYPE_VIDEO_MPEG4
Definition: mpeg.h:56
unsigned char psm_es_type[256]
Definition: mpeg.c:127
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:528
Stream structure.
Definition: avformat.h:889
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int imkh_cctv
Definition: mpeg.c:130
int32_t header_state
Definition: mpeg.c:126
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
#define AV_DISPOSITION_DEFAULT
Definition: avformat.h:836
#define FF_FDEBUG_TS
Definition: avformat.h:1611
static AVInputFormat * iformat
Definition: ffprobe.c:253
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:249
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:237
int debug
Flags to enable debugging.
Definition: avformat.h:1610
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
AVIOContext * pb
I/O context.
Definition: avformat.h:1391
#define ss
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:618
void * buf
Definition: avisynth_c.h:690
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
AVMediaType
Definition: avutil.h:199
#define STREAM_TYPE_AUDIO_AC3
Definition: mpeg.h:60
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:471
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
Round toward -infinity.
Definition: mathematics.h:82
static int64_t get_pts(AVIOContext *pb, int c)
Definition: mpeg.c:159
static int64_t pts
Global timestamp for the audio frames.
#define AVERROR_DEMUXER_NOT_FOUND
Demuxer not found.
Definition: error.h:53
static int mpegps_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpeg.c:471
int sample_rate
Audio only.
Definition: avcodec.h:4262
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
full parsing and repack
Definition: avformat.h:810
Main libavformat public API header.
static double c[64]
AVPacket * subs
array of subtitles packets
Definition: subtitles.h:103
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:950
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:109
int current_sub_idx
current position for the read packet callback
Definition: subtitles.h:106
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
int den
Denominator.
Definition: rational.h:60
static int check_pes(const uint8_t *p, const uint8_t *end)
Definition: mpeg.c:39
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4355
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
Definition: mathematics.h:108
#define av_free(p)
int len
#define STREAM_TYPE_VIDEO_MPEG2
Definition: mpeg.h:50
void * priv_data
Format private data.
Definition: avformat.h:1377
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:513
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:4166
int channels
Audio only.
Definition: avcodec.h:4258
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1678
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
AVCodecParameters * codecpar
Definition: avformat.h:1252
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:814
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:356
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
int stream_index
Definition: avcodec.h:1681
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:926
#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:952
#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:1127
This structure stores compressed data.
Definition: avcodec.h:1656
int nb_subs
number of subtitles packets
Definition: subtitles.h:104
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: avcodec.h:1672
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AVInputFormat ff_mpegps_demuxer
Definition: mpeg.c:670
static int mpegps_probe(AVProbeData *p)
Definition: mpeg.c:66