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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 #if CONFIG_VOBSUB_DEMUXER
28 # include "subtitles.h"
29 # include "libavutil/bprint.h"
30 # include "libavutil/opt.h"
31 #endif
32 
33 #include "libavutil/avassert.h"
34 
35 /*********************************************/
36 /* demux code */
37 
38 #define MAX_SYNC_SIZE 100000
39 
40 static int check_pes(const uint8_t *p, const uint8_t *end)
41 {
42  int pes1;
43  int pes2 = (p[3] & 0xC0) == 0x80 &&
44  (p[4] & 0xC0) != 0x40 &&
45  ((p[4] & 0xC0) == 0x00 ||
46  (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
47 
48  for (p += 3; p < end && *p == 0xFF; p++) ;
49  if ((*p & 0xC0) == 0x40)
50  p += 2;
51 
52  if ((*p & 0xF0) == 0x20)
53  pes1 = p[0] & p[2] & p[4] & 1;
54  else if ((*p & 0xF0) == 0x30)
55  pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
56  else
57  pes1 = *p == 0x0F;
58 
59  return pes1 || pes2;
60 }
61 
62 static int check_pack_header(const uint8_t *buf)
63 {
64  return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
65 }
66 
67 static int mpegps_probe(AVProbeData *p)
68 {
69  uint32_t code = -1;
70  int i;
71  int sys = 0, pspack = 0, priv1 = 0, vid = 0;
72  int audio = 0, invalid = 0, score = 0;
73  int endpes = 0;
74 
75  for (i = 0; i < p->buf_size; i++) {
76  code = (code << 8) + p->buf[i];
77  if ((code & 0xffffff00) == 0x100) {
78  int len = p->buf[i + 1] << 8 | p->buf[i + 2];
79  int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
80  int pack = check_pack_header(p->buf + i);
81 
82  if (code == SYSTEM_HEADER_START_CODE)
83  sys++;
84  else if (code == PACK_START_CODE && pack)
85  pspack++;
86  else if ((code & 0xf0) == VIDEO_ID && pes) {
87  endpes = i + len;
88  vid++;
89  }
90  // skip pes payload to avoid start code emulation for private
91  // and audio streams
92  else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
93  else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
94  else if (code == 0x1fd && pes) vid++; //VC1
95 
96  else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
97  else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
98  else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
99  }
100  }
101 
102  if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
103  score = AVPROBE_SCORE_EXTENSION / 2;
104 
105 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
106 // vid, audio, sys, pspack, invalid, p->buf_size);
107 
108  if (sys > invalid && sys * 9 <= pspack * 10)
109  return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
110  : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3
111  if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
112  return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
113  : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
114  if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
115  !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
116  return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
118 
119  // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
120  // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
121  // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
122  return score;
123 }
124 
125 typedef struct MpegDemuxContext {
126  AVClass *class;
128  unsigned char psm_es_type[256];
129  int sofdec;
130  int dvd;
132  int raw_ac3;
133 #if CONFIG_VOBSUB_DEMUXER
134  AVFormatContext *sub_ctx;
135  FFDemuxSubtitlesQueue q[32];
136  char *sub_name;
137 #endif
139 
141 {
142  MpegDemuxContext *m = s->priv_data;
143  char buffer[7] = { 0 };
144  int64_t last_pos = avio_tell(s->pb);
145 
146  m->header_state = 0xff;
148 
149  avio_get_str(s->pb, 6, buffer, sizeof(buffer));
150  if (!memcmp("IMKH", buffer, 4)) {
151  m->imkh_cctv = 1;
152  } else if (!memcmp("Sofdec", buffer, 6)) {
153  m->sofdec = 1;
154  } else
155  avio_seek(s->pb, last_pos, SEEK_SET);
156 
157  /* no need to do more */
158  return 0;
159 }
160 
161 static int64_t get_pts(AVIOContext *pb, int c)
162 {
163  uint8_t buf[5];
164 
165  buf[0] = c < 0 ? avio_r8(pb) : c;
166  avio_read(pb, buf + 1, 4);
167 
168  return ff_parse_pes_pts(buf);
169 }
170 
171 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
172  int32_t *header_state)
173 {
174  unsigned int state, v;
175  int val, n;
176 
177  state = *header_state;
178  n = *size_ptr;
179  while (n > 0) {
180  if (avio_feof(pb))
181  break;
182  v = avio_r8(pb);
183  n--;
184  if (state == 0x000001) {
185  state = ((state << 8) | v) & 0xffffff;
186  val = state;
187  goto found;
188  }
189  state = ((state << 8) | v) & 0xffffff;
190  }
191  val = -1;
192 
193 found:
194  *header_state = state;
195  *size_ptr = n;
196  return val;
197 }
198 
199 /**
200  * Extract stream types from a program stream map
201  * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
202  *
203  * @return number of bytes occupied by PSM in the bitstream
204  */
206 {
207  int psm_length, ps_info_length, es_map_length;
208 
209  psm_length = avio_rb16(pb);
210  avio_r8(pb);
211  avio_r8(pb);
212  ps_info_length = avio_rb16(pb);
213 
214  /* skip program_stream_info */
215  avio_skip(pb, ps_info_length);
216  /*es_map_length = */avio_rb16(pb);
217  /* Ignore es_map_length, trust psm_length */
218  es_map_length = psm_length - ps_info_length - 10;
219 
220  /* at least one es available? */
221  while (es_map_length >= 4) {
222  unsigned char type = avio_r8(pb);
223  unsigned char es_id = avio_r8(pb);
224  uint16_t es_info_length = avio_rb16(pb);
225 
226  /* remember mapping from stream id to stream type */
227  m->psm_es_type[es_id] = type;
228  /* skip program_stream_info */
229  avio_skip(pb, es_info_length);
230  es_map_length -= 4 + es_info_length;
231  }
232  avio_rb32(pb); /* crc32 */
233  return 2 + psm_length;
234 }
235 
236 /* read the next PES header. Return its position in ppos
237  * (if not NULL), and its start code, pts and dts.
238  */
240  int64_t *ppos, int *pstart_code,
241  int64_t *ppts, int64_t *pdts)
242 {
243  MpegDemuxContext *m = s->priv_data;
244  int len, size, startcode, c, flags, header_len;
245  int pes_ext, ext2_len, id_ext, skip;
246  int64_t pts, dts;
247  int64_t last_sync = avio_tell(s->pb);
248 
249 error_redo:
250  avio_seek(s->pb, last_sync, SEEK_SET);
251 redo:
252  /* next start code (should be immediately after) */
253  m->header_state = 0xff;
254  size = MAX_SYNC_SIZE;
255  startcode = find_next_start_code(s->pb, &size, &m->header_state);
256  last_sync = avio_tell(s->pb);
257  if (startcode < 0) {
258  if (avio_feof(s->pb))
259  return AVERROR_EOF;
260  // FIXME we should remember header_state
261  return FFERROR_REDO;
262  }
263 
264  if (startcode == PACK_START_CODE)
265  goto redo;
266  if (startcode == SYSTEM_HEADER_START_CODE)
267  goto redo;
268  if (startcode == PADDING_STREAM) {
269  avio_skip(s->pb, avio_rb16(s->pb));
270  goto redo;
271  }
272  if (startcode == PRIVATE_STREAM_2) {
273  if (!m->sofdec) {
274  /* Need to detect whether this from a DVD or a 'Sofdec' stream */
275  int len = avio_rb16(s->pb);
276  int bytesread = 0;
277  uint8_t *ps2buf = av_malloc(len);
278 
279  if (ps2buf) {
280  bytesread = avio_read(s->pb, ps2buf, len);
281 
282  if (bytesread != len) {
283  avio_skip(s->pb, len - bytesread);
284  } else {
285  uint8_t *p = 0;
286  if (len >= 6)
287  p = memchr(ps2buf, 'S', len - 5);
288 
289  if (p)
290  m->sofdec = !memcmp(p+1, "ofdec", 5);
291 
292  m->sofdec -= !m->sofdec;
293 
294  if (m->sofdec < 0) {
295  if (len == 980 && ps2buf[0] == 0) {
296  /* PCI structure? */
297  uint32_t startpts = AV_RB32(ps2buf + 0x0d);
298  uint32_t endpts = AV_RB32(ps2buf + 0x11);
299  uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
300  uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
301  uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
302 
303  m->dvd = (hours <= 23 &&
304  mins <= 59 &&
305  secs <= 59 &&
306  (ps2buf[0x19] & 0x0f) < 10 &&
307  (ps2buf[0x1a] & 0x0f) < 10 &&
308  (ps2buf[0x1b] & 0x0f) < 10 &&
309  endpts >= startpts);
310  } else if (len == 1018 && ps2buf[0] == 1) {
311  /* DSI structure? */
312  uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
313  uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
314  uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
315 
316  m->dvd = (hours <= 23 &&
317  mins <= 59 &&
318  secs <= 59 &&
319  (ps2buf[0x1d] & 0x0f) < 10 &&
320  (ps2buf[0x1e] & 0x0f) < 10 &&
321  (ps2buf[0x1f] & 0x0f) < 10);
322  }
323  }
324  }
325 
326  av_free(ps2buf);
327 
328  /* If this isn't a DVD packet or no memory
329  * could be allocated, just ignore it.
330  * If we did, move back to the start of the
331  * packet (plus 'length' field) */
332  if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
333  /* Skip back failed.
334  * This packet will be lost but that can't be helped
335  * if we can't skip back
336  */
337  goto redo;
338  }
339  } else {
340  /* No memory */
341  avio_skip(s->pb, len);
342  goto redo;
343  }
344  } else if (!m->dvd) {
345  int len = avio_rb16(s->pb);
346  avio_skip(s->pb, len);
347  goto redo;
348  }
349  }
350  if (startcode == PROGRAM_STREAM_MAP) {
351  mpegps_psm_parse(m, s->pb);
352  goto redo;
353  }
354 
355  /* find matching stream */
356  if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
357  (startcode >= 0x1e0 && startcode <= 0x1ef) ||
358  (startcode == 0x1bd) ||
359  (startcode == PRIVATE_STREAM_2) ||
360  (startcode == 0x1fd)))
361  goto redo;
362  if (ppos) {
363  *ppos = avio_tell(s->pb) - 4;
364  }
365  len = avio_rb16(s->pb);
366  pts =
367  dts = AV_NOPTS_VALUE;
368  if (startcode != PRIVATE_STREAM_2)
369  {
370  /* stuffing */
371  for (;;) {
372  if (len < 1)
373  goto error_redo;
374  c = avio_r8(s->pb);
375  len--;
376  /* XXX: for MPEG-1, should test only bit 7 */
377  if (c != 0xff)
378  break;
379  }
380  if ((c & 0xc0) == 0x40) {
381  /* buffer scale & size */
382  avio_r8(s->pb);
383  c = avio_r8(s->pb);
384  len -= 2;
385  }
386  if ((c & 0xe0) == 0x20) {
387  dts =
388  pts = get_pts(s->pb, c);
389  len -= 4;
390  if (c & 0x10) {
391  dts = get_pts(s->pb, -1);
392  len -= 5;
393  }
394  } else if ((c & 0xc0) == 0x80) {
395  /* mpeg 2 PES */
396  flags = avio_r8(s->pb);
397  header_len = avio_r8(s->pb);
398  len -= 2;
399  if (header_len > len)
400  goto error_redo;
401  len -= header_len;
402  if (flags & 0x80) {
403  dts = pts = get_pts(s->pb, -1);
404  header_len -= 5;
405  if (flags & 0x40) {
406  dts = get_pts(s->pb, -1);
407  header_len -= 5;
408  }
409  }
410  if (flags & 0x3f && header_len == 0) {
411  flags &= 0xC0;
412  av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
413  }
414  if (flags & 0x01) { /* PES extension */
415  pes_ext = avio_r8(s->pb);
416  header_len--;
417  /* Skip PES private data, program packet sequence counter
418  * and P-STD buffer */
419  skip = (pes_ext >> 4) & 0xb;
420  skip += skip & 0x9;
421  if (pes_ext & 0x40 || skip > header_len) {
422  av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
423  pes_ext = skip = 0;
424  }
425  avio_skip(s->pb, skip);
426  header_len -= skip;
427 
428  if (pes_ext & 0x01) { /* PES extension 2 */
429  ext2_len = avio_r8(s->pb);
430  header_len--;
431  if ((ext2_len & 0x7f) > 0) {
432  id_ext = avio_r8(s->pb);
433  if ((id_ext & 0x80) == 0)
434  startcode = ((startcode & 0xff) << 8) | id_ext;
435  header_len--;
436  }
437  }
438  }
439  if (header_len < 0)
440  goto error_redo;
441  avio_skip(s->pb, header_len);
442  } else if (c != 0xf)
443  goto redo;
444  }
445 
446  if (startcode == PRIVATE_STREAM_1) {
447  int ret = ffio_ensure_seekback(s->pb, 2);
448 
449  if (ret < 0)
450  return ret;
451 
452  startcode = avio_r8(s->pb);
453  m->raw_ac3 = 0;
454  if (startcode == 0x0b) {
455  if (avio_r8(s->pb) == 0x77) {
456  startcode = 0x80;
457  m->raw_ac3 = 1;
458  avio_skip(s->pb, -2);
459  } else {
460  avio_skip(s->pb, -1);
461  }
462  } else {
463  len--;
464  }
465  }
466  if (len < 0)
467  goto error_redo;
468  if (dts != AV_NOPTS_VALUE && ppos) {
469  int i;
470  for (i = 0; i < s->nb_streams; i++) {
471  if (startcode == s->streams[i]->id &&
472  (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
473  ff_reduce_index(s, i);
474  av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
475  AVINDEX_KEYFRAME /* FIXME keyframe? */);
476  }
477  }
478  }
479 
480  *pstart_code = startcode;
481  *ppts = pts;
482  *pdts = dts;
483  return len;
484 }
485 
487  AVPacket *pkt)
488 {
489  MpegDemuxContext *m = s->priv_data;
490  AVStream *st;
491  int len, startcode, i, es_type, ret;
492  int lpcm_header_len = -1; //Init to suppress warning
493  int request_probe= 0;
495  enum AVMediaType type;
496  int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
497 
498 redo:
499  len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
500  if (len < 0)
501  return len;
502 
503  if (startcode >= 0x80 && startcode <= 0xcf) {
504  if (len < 4)
505  goto skip;
506 
507  if (!m->raw_ac3) {
508  /* audio: skip header */
509  avio_r8(s->pb);
510  lpcm_header_len = avio_rb16(s->pb);
511  len -= 3;
512  if (startcode >= 0xb0 && startcode <= 0xbf) {
513  /* MLP/TrueHD audio has a 4-byte header */
514  avio_r8(s->pb);
515  len--;
516  }
517  }
518  }
519 
520  /* now find stream */
521  for (i = 0; i < s->nb_streams; i++) {
522  st = s->streams[i];
523  if (st->id == startcode)
524  goto found;
525  }
526 
527  es_type = m->psm_es_type[startcode & 0xff];
528  if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
529  codec_id = AV_CODEC_ID_MPEG2VIDEO;
530  type = AVMEDIA_TYPE_VIDEO;
531  } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
532  codec_id = AV_CODEC_ID_MPEG2VIDEO;
533  type = AVMEDIA_TYPE_VIDEO;
534  } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
535  es_type == STREAM_TYPE_AUDIO_MPEG2) {
536  codec_id = AV_CODEC_ID_MP3;
537  type = AVMEDIA_TYPE_AUDIO;
538  } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
539  codec_id = AV_CODEC_ID_AAC;
540  type = AVMEDIA_TYPE_AUDIO;
541  } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
542  codec_id = AV_CODEC_ID_MPEG4;
543  type = AVMEDIA_TYPE_VIDEO;
544  } else if (es_type == STREAM_TYPE_VIDEO_H264) {
545  codec_id = AV_CODEC_ID_H264;
546  type = AVMEDIA_TYPE_VIDEO;
547  } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
548  codec_id = AV_CODEC_ID_AC3;
549  type = AVMEDIA_TYPE_AUDIO;
550  } else if (m->imkh_cctv && es_type == 0x91) {
551  codec_id = AV_CODEC_ID_PCM_MULAW;
552  type = AVMEDIA_TYPE_AUDIO;
553  } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
554  static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
555  unsigned char buf[8];
556 
557  avio_read(s->pb, buf, 8);
558  avio_seek(s->pb, -8, SEEK_CUR);
559  if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
560  codec_id = AV_CODEC_ID_CAVS;
561  else
562  request_probe= 1;
563  type = AVMEDIA_TYPE_VIDEO;
564  } else if (startcode == PRIVATE_STREAM_2) {
565  type = AVMEDIA_TYPE_DATA;
566  codec_id = AV_CODEC_ID_DVD_NAV;
567  } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
568  type = AVMEDIA_TYPE_AUDIO;
569  if (m->sofdec > 0) {
570  codec_id = AV_CODEC_ID_ADPCM_ADX;
571  // Auto-detect AC-3
572  request_probe = 50;
573  } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
574  codec_id = AV_CODEC_ID_PCM_ALAW;
575  request_probe = 50;
576  } else {
577  codec_id = AV_CODEC_ID_MP2;
578  if (m->imkh_cctv)
579  request_probe = 25;
580  }
581  } else if (startcode >= 0x80 && startcode <= 0x87) {
582  type = AVMEDIA_TYPE_AUDIO;
583  codec_id = AV_CODEC_ID_AC3;
584  } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
585  (startcode >= 0x98 && startcode <= 0x9f)) {
586  /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
587  type = AVMEDIA_TYPE_AUDIO;
588  codec_id = AV_CODEC_ID_DTS;
589  } else if (startcode >= 0xa0 && startcode <= 0xaf) {
590  type = AVMEDIA_TYPE_AUDIO;
591  if (lpcm_header_len >= 6 && startcode == 0xa1) {
592  codec_id = AV_CODEC_ID_MLP;
593  } else {
594  codec_id = AV_CODEC_ID_PCM_DVD;
595  }
596  } else if (startcode >= 0xb0 && startcode <= 0xbf) {
597  type = AVMEDIA_TYPE_AUDIO;
598  codec_id = AV_CODEC_ID_TRUEHD;
599  } else if (startcode >= 0xc0 && startcode <= 0xcf) {
600  /* Used for both AC-3 and E-AC-3 in EVOB files */
601  type = AVMEDIA_TYPE_AUDIO;
602  codec_id = AV_CODEC_ID_AC3;
603  } else if (startcode >= 0x20 && startcode <= 0x3f) {
604  type = AVMEDIA_TYPE_SUBTITLE;
605  codec_id = AV_CODEC_ID_DVD_SUBTITLE;
606  } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
607  type = AVMEDIA_TYPE_VIDEO;
608  codec_id = AV_CODEC_ID_VC1;
609  } else {
610 skip:
611  /* skip packet */
612  avio_skip(s->pb, len);
613  goto redo;
614  }
615  /* no stream found: add a new stream */
616  st = avformat_new_stream(s, NULL);
617  if (!st)
618  goto skip;
619  st->id = startcode;
620  st->codecpar->codec_type = type;
621  st->codecpar->codec_id = codec_id;
624  st->codecpar->channels = 1;
626  st->codecpar->sample_rate = 8000;
627  }
628  st->request_probe = request_probe;
630 
631 found:
632  if (st->discard >= AVDISCARD_ALL)
633  goto skip;
634  if (startcode >= 0xa0 && startcode <= 0xaf) {
635  if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
636  if (len < 6)
637  goto skip;
638  avio_skip(s->pb, 6);
639  len -=6;
640  }
641  }
642  ret = av_get_packet(s->pb, pkt, len);
643 
644  pkt->pts = pts;
645  pkt->dts = dts;
646  pkt->pos = dummy_pos;
647  pkt->stream_index = st->index;
648 
649  if (s->debug & FF_FDEBUG_TS)
650  av_log(s, AV_LOG_TRACE, "%d: pts=%0.3f dts=%0.3f size=%d\n",
651  pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
652  pkt->size);
653 
654  return (ret < 0) ? ret : 0;
655 }
656 
657 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
658  int64_t *ppos, int64_t pos_limit)
659 {
660  int len, startcode;
661  int64_t pos, pts, dts;
662 
663  pos = *ppos;
664  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
665  return AV_NOPTS_VALUE;
666 
667  for (;;) {
668  len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
669  if (len < 0) {
670  if (s->debug & FF_FDEBUG_TS)
671  av_log(s, AV_LOG_TRACE, "none (ret=%d)\n", len);
672  return AV_NOPTS_VALUE;
673  }
674  if (startcode == s->streams[stream_index]->id &&
675  dts != AV_NOPTS_VALUE) {
676  break;
677  }
678  avio_skip(s->pb, len);
679  }
680  if (s->debug & FF_FDEBUG_TS)
681  av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
682  pos, dts, dts / 90000.0);
683  *ppos = pos;
684  return dts;
685 }
686 
688  .name = "mpeg",
689  .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
690  .priv_data_size = sizeof(MpegDemuxContext),
694  .read_timestamp = mpegps_read_dts,
696 };
697 
698 #if CONFIG_VOBSUB_DEMUXER
699 
700 #define REF_STRING "# VobSub index file,"
701 #define MAX_LINE_SIZE 2048
702 
703 static int vobsub_probe(AVProbeData *p)
704 {
705  if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
706  return AVPROBE_SCORE_MAX;
707  return 0;
708 }
709 
710 static int vobsub_read_header(AVFormatContext *s)
711 {
712  int i, ret = 0, header_parsed = 0, langidx = 0;
713  MpegDemuxContext *vobsub = s->priv_data;
714  size_t fname_len;
715  char *header_str;
716  AVBPrint header;
717  int64_t delay = 0;
718  AVStream *st = NULL;
719  int stream_id = -1;
720  char id[64] = {0};
721  char alt[MAX_LINE_SIZE] = {0};
723 
724  if (!vobsub->sub_name) {
725  char *ext;
726  vobsub->sub_name = av_strdup(s->url);
727  if (!vobsub->sub_name) {
728  ret = AVERROR(ENOMEM);
729  goto end;
730  }
731 
732  fname_len = strlen(vobsub->sub_name);
733  ext = vobsub->sub_name - 3 + fname_len;
734  if (fname_len < 4 || *(ext - 1) != '.') {
735  av_log(s, AV_LOG_ERROR, "The input index filename is too short "
736  "to guess the associated .SUB file\n");
737  ret = AVERROR_INVALIDDATA;
738  goto end;
739  }
740  memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
741  av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name);
742  }
743 
744  if (!(iformat = av_find_input_format("mpeg"))) {
746  goto end;
747  }
748 
749  vobsub->sub_ctx = avformat_alloc_context();
750  if (!vobsub->sub_ctx) {
751  ret = AVERROR(ENOMEM);
752  goto end;
753  }
754 
755  if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
756  goto end;
757 
758  ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
759  if (ret < 0) {
760  av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
761  goto end;
762  }
763 
765  while (!avio_feof(s->pb)) {
766  char line[MAX_LINE_SIZE];
767  int len = ff_get_line(s->pb, line, sizeof(line));
768 
769  if (!len)
770  break;
771 
772  line[strcspn(line, "\r\n")] = 0;
773 
774  if (!strncmp(line, "id:", 3)) {
775  if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
776  av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
777  "assuming 'id: und, index: 0'\n", line);
778  strcpy(id, "und");
779  stream_id = 0;
780  }
781 
782  if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
783  av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
784  ret = AVERROR(EINVAL);
785  goto end;
786  }
787 
788  header_parsed = 1;
789  alt[0] = '\0';
790  /* We do not create the stream immediately to avoid adding empty
791  * streams. See the following timestamp entry. */
792 
793  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
794 
795  } else if (!strncmp(line, "timestamp:", 10)) {
796  AVPacket *sub;
797  int hh, mm, ss, ms;
798  int64_t pos, timestamp;
799  const char *p = line + 10;
800 
801  if (stream_id == -1) {
802  av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
803  ret = AVERROR_INVALIDDATA;
804  goto end;
805  }
806 
807  if (!st || st->id != stream_id) {
808  st = avformat_new_stream(s, NULL);
809  if (!st) {
810  ret = AVERROR(ENOMEM);
811  goto end;
812  }
813  st->id = stream_id;
816  avpriv_set_pts_info(st, 64, 1, 1000);
817  av_dict_set(&st->metadata, "language", id, 0);
818  if (alt[0])
819  av_dict_set(&st->metadata, "title", alt, 0);
820  }
821 
822  if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
823  &hh, &mm, &ss, &ms, &pos) != 5) {
824  av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
825  "abort parsing\n", line);
826  ret = AVERROR_INVALIDDATA;
827  goto end;
828  }
829  timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
830  timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
831 
832  sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
833  if (!sub) {
834  ret = AVERROR(ENOMEM);
835  goto end;
836  }
837  sub->pos = pos;
838  sub->pts = timestamp;
839  sub->stream_index = s->nb_streams - 1;
840 
841  } else if (!strncmp(line, "alt:", 4)) {
842  const char *p = line + 4;
843 
844  while (*p == ' ')
845  p++;
846  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
847  av_strlcpy(alt, p, sizeof(alt));
848  header_parsed = 1;
849 
850  } else if (!strncmp(line, "delay:", 6)) {
851  int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
852  const char *p = line + 6;
853 
854  while (*p == ' ')
855  p++;
856  if (*p == '-' || *p == '+') {
857  sign = *p == '-' ? -1 : 1;
858  p++;
859  }
860  sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
861  delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
862 
863  } else if (!strncmp(line, "langidx:", 8)) {
864  const char *p = line + 8;
865 
866  if (sscanf(p, "%d", &langidx) != 1)
867  av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
868 
869  } else if (!header_parsed) {
870  if (line[0] && line[0] != '#')
871  av_bprintf(&header, "%s\n", line);
872  }
873  }
874 
875  if (langidx < s->nb_streams)
877 
878  for (i = 0; i < s->nb_streams; i++) {
879  vobsub->q[i].sort = SUB_SORT_POS_TS;
880  vobsub->q[i].keep_duplicates = 1;
881  ff_subtitles_queue_finalize(s, &vobsub->q[i]);
882  }
883 
884  if (!av_bprint_is_complete(&header)) {
885  av_bprint_finalize(&header, NULL);
886  ret = AVERROR(ENOMEM);
887  goto end;
888  }
889  av_bprint_finalize(&header, &header_str);
890  for (i = 0; i < s->nb_streams; i++) {
891  AVStream *sub_st = s->streams[i];
892  sub_st->codecpar->extradata = av_strdup(header_str);
893  sub_st->codecpar->extradata_size = header.len;
894  }
895  av_free(header_str);
896 
897 end:
898  return ret;
899 }
900 
901 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
902 {
903  MpegDemuxContext *vobsub = s->priv_data;
905  AVIOContext *pb = vobsub->sub_ctx->pb;
906  int ret, psize, total_read = 0, i;
907  AVPacket idx_pkt = { 0 };
908 
909  int64_t min_ts = INT64_MAX;
910  int sid = 0;
911  for (i = 0; i < s->nb_streams; i++) {
912  FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
913  int64_t ts;
914  av_assert0(tmpq->nb_subs);
915  ts = tmpq->subs[tmpq->current_sub_idx].pts;
916  if (ts < min_ts) {
917  min_ts = ts;
918  sid = i;
919  }
920  }
921  q = &vobsub->q[sid];
922  ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
923  if (ret < 0)
924  return ret;
925 
926  /* compute maximum packet size using the next packet position. This is
927  * useful when the len in the header is non-sense */
928  if (q->current_sub_idx < q->nb_subs) {
929  psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
930  } else {
931  int64_t fsize = avio_size(pb);
932  psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
933  }
934 
935  avio_seek(pb, idx_pkt.pos, SEEK_SET);
936 
937  av_init_packet(pkt);
938  pkt->size = 0;
939  pkt->data = NULL;
940 
941  do {
942  int n, to_read, startcode;
943  int64_t pts, dts;
944  int64_t old_pos = avio_tell(pb), new_pos;
945  int pkt_size;
946 
947  ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
948  if (ret < 0) {
949  if (pkt->size) // raise packet even if incomplete
950  break;
951  goto fail;
952  }
953  to_read = ret & 0xffff;
954  new_pos = avio_tell(pb);
955  pkt_size = ret + (new_pos - old_pos);
956 
957  /* this prevents reads above the current packet */
958  if (total_read + pkt_size > psize)
959  break;
960  total_read += pkt_size;
961 
962  /* the current chunk doesn't match the stream index (unlikely) */
963  if ((startcode & 0x1f) != s->streams[idx_pkt.stream_index]->id)
964  break;
965 
966  ret = av_grow_packet(pkt, to_read);
967  if (ret < 0)
968  goto fail;
969 
970  n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
971  if (n < to_read)
972  pkt->size -= to_read - n;
973  } while (total_read < psize);
974 
975  pkt->pts = pkt->dts = idx_pkt.pts;
976  pkt->pos = idx_pkt.pos;
977  pkt->stream_index = idx_pkt.stream_index;
978 
979  av_packet_unref(&idx_pkt);
980  return 0;
981 
982 fail:
983  av_packet_unref(pkt);
984  av_packet_unref(&idx_pkt);
985  return ret;
986 }
987 
988 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
989  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
990 {
991  MpegDemuxContext *vobsub = s->priv_data;
992 
993  /* Rescale requested timestamps based on the first stream (timebase is the
994  * same for all subtitles stream within a .idx/.sub). Rescaling is done just
995  * like in avformat_seek_file(). */
996  if (stream_index == -1 && s->nb_streams != 1) {
997  int i, ret = 0;
998  AVRational time_base = s->streams[0]->time_base;
999  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
1000  min_ts = av_rescale_rnd(min_ts, time_base.den,
1001  time_base.num * (int64_t)AV_TIME_BASE,
1003  max_ts = av_rescale_rnd(max_ts, time_base.den,
1004  time_base.num * (int64_t)AV_TIME_BASE,
1006  for (i = 0; i < s->nb_streams; i++) {
1007  int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
1008  min_ts, ts, max_ts, flags);
1009  if (r < 0)
1010  ret = r;
1011  }
1012  return ret;
1013  }
1014 
1015  if (stream_index == -1) // only 1 stream
1016  stream_index = 0;
1017  return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1018  min_ts, ts, max_ts, flags);
1019 }
1020 
1021 static int vobsub_read_close(AVFormatContext *s)
1022 {
1023  int i;
1024  MpegDemuxContext *vobsub = s->priv_data;
1025 
1026  for (i = 0; i < s->nb_streams; i++)
1027  ff_subtitles_queue_clean(&vobsub->q[i]);
1028  if (vobsub->sub_ctx)
1029  avformat_close_input(&vobsub->sub_ctx);
1030  return 0;
1031 }
1032 
1033 static const AVOption options[] = {
1034  { "sub_name", "URI for .sub file", offsetof(MpegDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1035  { NULL }
1036 };
1037 
1038 static const AVClass vobsub_demuxer_class = {
1039  .class_name = "vobsub",
1040  .item_name = av_default_item_name,
1041  .option = options,
1042  .version = LIBAVUTIL_VERSION_INT,
1043 };
1044 
1046  .name = "vobsub",
1047  .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1048  .priv_data_size = sizeof(MpegDemuxContext),
1049  .read_probe = vobsub_probe,
1050  .read_header = vobsub_read_header,
1051  .read_packet = vobsub_read_packet,
1052  .read_seek2 = vobsub_read_seek,
1053  .read_close = vobsub_read_close,
1054  .flags = AVFMT_SHOW_IDS,
1055  .extensions = "idx",
1056  .priv_class = &vobsub_demuxer_class,
1057 };
1058 #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:336
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
#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:2038
#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: avcodec.h:1450
#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:4811
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:164
#define MAX_SYNC_SIZE
Definition: mpeg.c:38
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:874
int size
Definition: avcodec.h:1431
#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:246
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:297
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
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:239
#define STREAM_TYPE_VIDEO_MPEG1
Definition: mpeg.h:49
discard all
Definition: avcodec.h:794
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:786
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1391
static int mpegps_read_header(AVFormatContext *s)
Definition: mpeg.c:140
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:467
Format I/O context.
Definition: avformat.h:1342
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:1966
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:1286
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:208
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
enum AVStreamParseType need_parsing
Definition: avformat.h:1091
int id
Format-specific stream ID.
Definition: avformat.h:880
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4441
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data)...
Definition: internal.h:644
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
#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:1430
static int flags
Definition: log.c:55
#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:310
ptrdiff_t size
Definition: opengl_enc.c:101
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:657
uint64_t channel_layout
Audio only.
Definition: avcodec.h:3986
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
#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:810
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#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:471
#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
#define MAX_LINE_SIZE
Definition: vf_lut3d.c:249
static int check_pack_header(const uint8_t *buf)
Definition: mpeg.c:62
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:1438
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:552
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
#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:116
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3902
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:639
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
Definition: format.c:118
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
#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:171
static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
Extract stream types from a program stream map According to ISO/IEC 13818-1 ('MPEG-2 Systems') table ...
Definition: mpeg.c:205
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:937
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:809
enum AVCodecID codec_id
Definition: vaapi_decode.c:362
static struct @271 state
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: avcodec.h:220
#define FF_ARRAY_ELEMS(a)
#define STREAM_TYPE_VIDEO_MPEG4
Definition: mpeg.h:56
unsigned char psm_es_type[256]
Definition: mpeg.c:128
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:873
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int imkh_cctv
Definition: mpeg.c:131
int32_t header_state
Definition: mpeg.c:127
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
#define AV_DISPOSITION_DEFAULT
Definition: avformat.h:819
#define FF_FDEBUG_TS
Definition: avformat.h:1624
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:245
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
int debug
Flags to enable debugging.
Definition: avformat.h:1623
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
#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:592
void * buf
Definition: avisynth_c.h:690
GLint GLenum type
Definition: opengl_enc.c:105
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:458
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
Round toward -infinity.
Definition: mathematics.h:82
static int64_t get_pts(AVIOContext *pb, int c)
Definition: mpeg.c:161
static int64_t pts
#define AVERROR_DEMUXER_NOT_FOUND
Demuxer not found.
Definition: error.h:53
static int mpegps_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpeg.c:486
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:1052
int sample_rate
Audio only.
Definition: avcodec.h:3994
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
full parsing and repack
Definition: avformat.h:793
Main libavformat public API header.
const OptionDef options[]
Definition: ffmpeg_opt.c:3292
if(ret< 0)
Definition: vf_mcdeint.c:279
static double c[64]
AVPacket * subs
array of subtitles packets
Definition: subtitles.h:103
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:926
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:40
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4413
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:1370
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:537
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
int channels
Audio only.
Definition: avcodec.h:3990
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1429
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:880
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:358
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
int stream_index
Definition: avcodec.h:1432
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:902
#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:928
#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:1124
This structure stores compressed data.
Definition: avcodec.h:1407
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:193
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1423
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
GLuint buffer
Definition: opengl_enc.c:102
AVInputFormat ff_mpegps_demuxer
Definition: mpeg.c:687
static int mpegps_probe(AVProbeData *p)
Definition: mpeg.c:67