FFmpeg  2.1.1
mpeg.c
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1 /*
2  * MPEG1/2 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 #endif
30 
31 #undef NDEBUG
32 #include <assert.h>
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  int pes1;
42  int pes2= (p[3] & 0xC0) == 0x80
43  && (p[4] & 0xC0) != 0x40
44  &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
45 
46  for(p+=3; p<end && *p == 0xFF; p++);
47  if((*p&0xC0) == 0x40) p+=2;
48  if((*p&0xF0) == 0x20){
49  pes1= p[0]&p[2]&p[4]&1;
50  }else if((*p&0xF0) == 0x30){
51  pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
52  }else
53  pes1 = *p == 0x0F;
54 
55  return pes1||pes2;
56 }
57 
58 static int check_pack_header(const uint8_t *buf) {
59  return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
60 }
61 
62 static int mpegps_probe(AVProbeData *p)
63 {
64  uint32_t code= -1;
65  int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
66  int i;
67  int score=0;
68 
69  for(i=0; i<p->buf_size; i++){
70  code = (code<<8) + p->buf[i];
71  if ((code & 0xffffff00) == 0x100) {
72  int len= p->buf[i+1] << 8 | p->buf[i+2];
73  int pes= check_pes(p->buf+i, p->buf+p->buf_size);
74  int pack = check_pack_header(p->buf+i);
75 
76  if(code == SYSTEM_HEADER_START_CODE) sys++;
77  else if(code == PACK_START_CODE && pack) pspack++;
78  else if((code & 0xf0) == VIDEO_ID && pes) vid++;
79  // skip pes payload to avoid start code emulation for private
80  // and audio streams
81  else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
82  else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
83  else if(code == 0x1fd && pes) vid++; //VC1
84 
85  else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
86  else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
87  else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
88  }
89  }
90 
91  if(vid+audio > invalid+1) /* invalid VDR files nd short PES streams */
92  score = AVPROBE_SCORE_EXTENSION / 2;
93 
94  if(sys>invalid && sys*9 <= pspack*10)
95  return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
96  if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
97  return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
98  if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
99  return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2;
100 
101  //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
102  //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
103  //Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
104  return score;
105 }
106 
107 
108 typedef struct MpegDemuxContext {
110  unsigned char psm_es_type[256];
111  int sofdec;
112  int dvd;
114 #if CONFIG_VOBSUB_DEMUXER
115  AVFormatContext *sub_ctx;
116  FFDemuxSubtitlesQueue q[32];
117 #endif
119 
121 {
123  char buffer[7];
124  int64_t last_pos = avio_tell(s->pb);
125 
126  m->header_state = 0xff;
128 
129  avio_get_str(s->pb, 6, buffer, sizeof(buffer));
130  if (!memcmp("IMKH", buffer, 4)) {
131  m->imkh_cctv = 1;
132  } else if (!memcmp("Sofdec", buffer, 6)) {
133  m->sofdec = 1;
134  } else
135  avio_seek(s->pb, last_pos, SEEK_SET);
136 
137  /* no need to do more */
138  return 0;
139 }
140 
141 static int64_t get_pts(AVIOContext *pb, int c)
142 {
143  uint8_t buf[5];
144 
145  buf[0] = c<0 ? avio_r8(pb) : c;
146  avio_read(pb, buf+1, 4);
147 
148  return ff_parse_pes_pts(buf);
149 }
150 
151 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
152  int32_t *header_state)
153 {
154  unsigned int state, v;
155  int val, n;
156 
157  state = *header_state;
158  n = *size_ptr;
159  while (n > 0) {
160  if (url_feof(pb))
161  break;
162  v = avio_r8(pb);
163  n--;
164  if (state == 0x000001) {
165  state = ((state << 8) | v) & 0xffffff;
166  val = state;
167  goto found;
168  }
169  state = ((state << 8) | v) & 0xffffff;
170  }
171  val = -1;
172  found:
173  *header_state = state;
174  *size_ptr = n;
175  return val;
176 }
177 
178 /**
179  * Extract stream types from a program stream map
180  * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
181  *
182  * @return number of bytes occupied by PSM in the bitstream
183  */
185 {
186  int psm_length, ps_info_length, es_map_length;
187 
188  psm_length = avio_rb16(pb);
189  avio_r8(pb);
190  avio_r8(pb);
191  ps_info_length = avio_rb16(pb);
192 
193  /* skip program_stream_info */
194  avio_skip(pb, ps_info_length);
195  es_map_length = avio_rb16(pb);
196 
197  /* at least one es available? */
198  while (es_map_length >= 4){
199  unsigned char type = avio_r8(pb);
200  unsigned char es_id = avio_r8(pb);
201  uint16_t es_info_length = avio_rb16(pb);
202  /* remember mapping from stream id to stream type */
203  m->psm_es_type[es_id] = type;
204  /* skip program_stream_info */
205  avio_skip(pb, es_info_length);
206  es_map_length -= 4 + es_info_length;
207  }
208  avio_rb32(pb); /* crc32 */
209  return 2 + psm_length;
210 }
211 
212 /* read the next PES header. Return its position in ppos
213  (if not NULL), and its start code, pts and dts.
214  */
216  int64_t *ppos, int *pstart_code,
217  int64_t *ppts, int64_t *pdts)
218 {
220  int len, size, startcode, c, flags, header_len;
221  int pes_ext, ext2_len, id_ext, skip;
222  int64_t pts, dts;
223  int64_t last_sync= avio_tell(s->pb);
224 
225  error_redo:
226  avio_seek(s->pb, last_sync, SEEK_SET);
227  redo:
228  /* next start code (should be immediately after) */
229  m->header_state = 0xff;
230  size = MAX_SYNC_SIZE;
231  startcode = find_next_start_code(s->pb, &size, &m->header_state);
232  last_sync = avio_tell(s->pb);
233  if (startcode < 0){
234  if(url_feof(s->pb))
235  return AVERROR_EOF;
236  //FIXME we should remember header_state
237  return AVERROR(EAGAIN);
238  }
239 
240  if (startcode == PACK_START_CODE)
241  goto redo;
242  if (startcode == SYSTEM_HEADER_START_CODE)
243  goto redo;
244  if (startcode == PADDING_STREAM) {
245  avio_skip(s->pb, avio_rb16(s->pb));
246  goto redo;
247  }
248  if (startcode == PRIVATE_STREAM_2) {
249  if (!m->sofdec) {
250  /* Need to detect whether this from a DVD or a 'Sofdec' stream */
251  int len = avio_rb16(s->pb);
252  int bytesread = 0;
253  uint8_t *ps2buf = av_malloc(len);
254 
255  if (ps2buf) {
256  bytesread = avio_read(s->pb, ps2buf, len);
257 
258  if (bytesread != len) {
259  avio_skip(s->pb, len - bytesread);
260  } else {
261  uint8_t *p = 0;
262  if (len >= 6)
263  p = memchr(ps2buf, 'S', len - 5);
264 
265  if (p)
266  m->sofdec = !memcmp(p+1, "ofdec", 5);
267 
268  m->sofdec -= !m->sofdec;
269 
270  if (m->sofdec < 0) {
271  if (len == 980 && ps2buf[0] == 0) {
272  /* PCI structure? */
273  uint32_t startpts = AV_RB32(ps2buf + 0x0d);
274  uint32_t endpts = AV_RB32(ps2buf + 0x11);
275  uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
276  uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
277  uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
278 
279  m->dvd = (hours <= 23 &&
280  mins <= 59 &&
281  secs <= 59 &&
282  (ps2buf[0x19] & 0x0f) < 10 &&
283  (ps2buf[0x1a] & 0x0f) < 10 &&
284  (ps2buf[0x1b] & 0x0f) < 10 &&
285  endpts >= startpts);
286  } else if (len == 1018 && ps2buf[0] == 1) {
287  /* DSI structure? */
288  uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
289  uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
290  uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
291 
292  m->dvd = (hours <= 23 &&
293  mins <= 59 &&
294  secs <= 59 &&
295  (ps2buf[0x1d] & 0x0f) < 10 &&
296  (ps2buf[0x1e] & 0x0f) < 10 &&
297  (ps2buf[0x1f] & 0x0f) < 10);
298  }
299  }
300  }
301 
302  av_free(ps2buf);
303 
304  /* If this isn't a DVD packet or no memory
305  * could be allocated, just ignore it.
306  * If we did, move back to the start of the
307  * packet (plus 'length' field) */
308  if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
309  /* Skip back failed.
310  * This packet will be lost but that can't be helped
311  * if we can't skip back
312  */
313  goto redo;
314  }
315  } else {
316  /* No memory */
317  avio_skip(s->pb, len);
318  goto redo;
319  }
320  } else if (!m->dvd) {
321  int len = avio_rb16(s->pb);
322  avio_skip(s->pb, len);
323  goto redo;
324  }
325  }
326  if (startcode == PROGRAM_STREAM_MAP) {
327  mpegps_psm_parse(m, s->pb);
328  goto redo;
329  }
330 
331  /* find matching stream */
332  if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
333  (startcode >= 0x1e0 && startcode <= 0x1ef) ||
334  (startcode == 0x1bd) ||
335  (startcode == PRIVATE_STREAM_2) ||
336  (startcode == 0x1fd)))
337  goto redo;
338  if (ppos) {
339  *ppos = avio_tell(s->pb) - 4;
340  }
341  len = avio_rb16(s->pb);
342  pts =
343  dts = AV_NOPTS_VALUE;
344  if (startcode != PRIVATE_STREAM_2)
345  {
346  /* stuffing */
347  for(;;) {
348  if (len < 1)
349  goto error_redo;
350  c = avio_r8(s->pb);
351  len--;
352  /* XXX: for mpeg1, should test only bit 7 */
353  if (c != 0xff)
354  break;
355  }
356  if ((c & 0xc0) == 0x40) {
357  /* buffer scale & size */
358  avio_r8(s->pb);
359  c = avio_r8(s->pb);
360  len -= 2;
361  }
362  if ((c & 0xe0) == 0x20) {
363  dts = pts = get_pts(s->pb, c);
364  len -= 4;
365  if (c & 0x10){
366  dts = get_pts(s->pb, -1);
367  len -= 5;
368  }
369  } else if ((c & 0xc0) == 0x80) {
370  /* mpeg 2 PES */
371  flags = avio_r8(s->pb);
372  header_len = avio_r8(s->pb);
373  len -= 2;
374  if (header_len > len)
375  goto error_redo;
376  len -= header_len;
377  if (flags & 0x80) {
378  dts = pts = get_pts(s->pb, -1);
379  header_len -= 5;
380  if (flags & 0x40) {
381  dts = get_pts(s->pb, -1);
382  header_len -= 5;
383  }
384  }
385  if (flags & 0x3f && header_len == 0){
386  flags &= 0xC0;
387  av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
388  }
389  if (flags & 0x01) { /* PES extension */
390  pes_ext = avio_r8(s->pb);
391  header_len--;
392  /* Skip PES private data, program packet sequence counter and P-STD buffer */
393  skip = (pes_ext >> 4) & 0xb;
394  skip += skip & 0x9;
395  if (pes_ext & 0x40 || skip > header_len){
396  av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
397  pes_ext=skip=0;
398  }
399  avio_skip(s->pb, skip);
400  header_len -= skip;
401 
402  if (pes_ext & 0x01) { /* PES extension 2 */
403  ext2_len = avio_r8(s->pb);
404  header_len--;
405  if ((ext2_len & 0x7f) > 0) {
406  id_ext = avio_r8(s->pb);
407  if ((id_ext & 0x80) == 0)
408  startcode = ((startcode & 0xff) << 8) | id_ext;
409  header_len--;
410  }
411  }
412  }
413  if(header_len < 0)
414  goto error_redo;
415  avio_skip(s->pb, header_len);
416  }
417  else if( c!= 0xf )
418  goto redo;
419  }
420 
421  if (startcode == PRIVATE_STREAM_1) {
422  startcode = avio_r8(s->pb);
423  len--;
424  }
425  if(len<0)
426  goto error_redo;
427  if(dts != AV_NOPTS_VALUE && ppos){
428  int i;
429  for(i=0; i<s->nb_streams; i++){
430  if(startcode == s->streams[i]->id &&
431  s->pb->seekable /* index useless on streams anyway */) {
432  ff_reduce_index(s, i);
433  av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
434  }
435  }
436  }
437 
438  *pstart_code = startcode;
439  *ppts = pts;
440  *pdts = dts;
441  return len;
442 }
443 
445  AVPacket *pkt)
446 {
448  AVStream *st;
449  int len, startcode, i, es_type, ret;
450  int lpcm_header_len = -1; //Init to supress warning
451  int request_probe= 0;
453  enum AVMediaType type;
454  int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
455 
456  redo:
457  len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
458  if (len < 0)
459  return len;
460 
461  if (startcode >= 0x80 && startcode <= 0xcf) {
462  if(len < 4)
463  goto skip;
464 
465  /* audio: skip header */
466  avio_r8(s->pb);
467  lpcm_header_len = avio_rb16(s->pb);
468  len -= 3;
469  if (startcode >= 0xb0 && startcode <= 0xbf) {
470  /* MLP/TrueHD audio has a 4-byte header */
471  avio_r8(s->pb);
472  len--;
473  }
474  }
475 
476  /* now find stream */
477  for(i=0;i<s->nb_streams;i++) {
478  st = s->streams[i];
479  if (st->id == startcode)
480  goto found;
481  }
482 
483  es_type = m->psm_es_type[startcode & 0xff];
484  if(es_type == STREAM_TYPE_VIDEO_MPEG1){
485  codec_id = AV_CODEC_ID_MPEG2VIDEO;
486  type = AVMEDIA_TYPE_VIDEO;
487  } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
488  codec_id = AV_CODEC_ID_MPEG2VIDEO;
489  type = AVMEDIA_TYPE_VIDEO;
490  } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
491  es_type == STREAM_TYPE_AUDIO_MPEG2){
492  codec_id = AV_CODEC_ID_MP3;
493  type = AVMEDIA_TYPE_AUDIO;
494  } else if(es_type == STREAM_TYPE_AUDIO_AAC){
495  codec_id = AV_CODEC_ID_AAC;
496  type = AVMEDIA_TYPE_AUDIO;
497  } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
498  codec_id = AV_CODEC_ID_MPEG4;
499  type = AVMEDIA_TYPE_VIDEO;
500  } else if(es_type == STREAM_TYPE_VIDEO_H264){
501  codec_id = AV_CODEC_ID_H264;
502  type = AVMEDIA_TYPE_VIDEO;
503  } else if(es_type == STREAM_TYPE_AUDIO_AC3){
504  codec_id = AV_CODEC_ID_AC3;
505  type = AVMEDIA_TYPE_AUDIO;
506  } else if(m->imkh_cctv && es_type == 0x91){
507  codec_id = AV_CODEC_ID_PCM_MULAW;
508  type = AVMEDIA_TYPE_AUDIO;
509  } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
510  static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
511  unsigned char buf[8];
512  avio_read(s->pb, buf, 8);
513  avio_seek(s->pb, -8, SEEK_CUR);
514  if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
515  codec_id = AV_CODEC_ID_CAVS;
516  else
517  request_probe= 1;
518  type = AVMEDIA_TYPE_VIDEO;
519  } else if (startcode == PRIVATE_STREAM_2) {
520  type = AVMEDIA_TYPE_DATA;
521  codec_id = AV_CODEC_ID_DVD_NAV;
522  } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
523  type = AVMEDIA_TYPE_AUDIO;
524  codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
525  } else if (startcode >= 0x80 && startcode <= 0x87) {
526  type = AVMEDIA_TYPE_AUDIO;
527  codec_id = AV_CODEC_ID_AC3;
528  } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
529  ||( startcode >= 0x98 && startcode <= 0x9f)) {
530  /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
531  type = AVMEDIA_TYPE_AUDIO;
532  codec_id = AV_CODEC_ID_DTS;
533  } else if (startcode >= 0xa0 && startcode <= 0xaf) {
534  type = AVMEDIA_TYPE_AUDIO;
535  if(lpcm_header_len == 6) {
536  codec_id = AV_CODEC_ID_MLP;
537  } else {
538  codec_id = AV_CODEC_ID_PCM_DVD;
539  }
540  } else if (startcode >= 0xb0 && startcode <= 0xbf) {
541  type = AVMEDIA_TYPE_AUDIO;
542  codec_id = AV_CODEC_ID_TRUEHD;
543  } else if (startcode >= 0xc0 && startcode <= 0xcf) {
544  /* Used for both AC-3 and E-AC-3 in EVOB files */
545  type = AVMEDIA_TYPE_AUDIO;
546  codec_id = AV_CODEC_ID_AC3;
547  } else if (startcode >= 0x20 && startcode <= 0x3f) {
548  type = AVMEDIA_TYPE_SUBTITLE;
549  codec_id = AV_CODEC_ID_DVD_SUBTITLE;
550  } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
551  type = AVMEDIA_TYPE_VIDEO;
552  codec_id = AV_CODEC_ID_VC1;
553  } else {
554  skip:
555  /* skip packet */
556  avio_skip(s->pb, len);
557  goto redo;
558  }
559  /* no stream found: add a new stream */
560  st = avformat_new_stream(s, NULL);
561  if (!st)
562  goto skip;
563  st->id = startcode;
564  st->codec->codec_type = type;
565  st->codec->codec_id = codec_id;
566  if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) {
567  st->codec->channels = 1;
569  st->codec->sample_rate = 8000;
570  }
571  st->request_probe = request_probe;
573  found:
574  if(st->discard >= AVDISCARD_ALL)
575  goto skip;
576  if (startcode >= 0xa0 && startcode <= 0xaf) {
577  if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) {
578  if (len < 6)
579  goto skip;
580  avio_skip(s->pb, 6);
581  len -=6;
582  }
583  }
584  ret = av_get_packet(s->pb, pkt, len);
585  pkt->pts = pts;
586  pkt->dts = dts;
587  pkt->pos = dummy_pos;
588  pkt->stream_index = st->index;
589  av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
590  pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
591  pkt->size);
592 
593  return (ret < 0) ? ret : 0;
594 }
595 
596 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
597  int64_t *ppos, int64_t pos_limit)
598 {
599  int len, startcode;
600  int64_t pos, pts, dts;
601 
602  pos = *ppos;
603  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
604  return AV_NOPTS_VALUE;
605 
606  for(;;) {
607  len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
608  if (len < 0) {
609  av_dlog(s, "none (ret=%d)\n", len);
610  return AV_NOPTS_VALUE;
611  }
612  if (startcode == s->streams[stream_index]->id &&
613  dts != AV_NOPTS_VALUE) {
614  break;
615  }
616  avio_skip(s->pb, len);
617  }
618  av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
619  pos, dts, dts / 90000.0);
620  *ppos = pos;
621  return dts;
622 }
623 
625  .name = "mpeg",
626  .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
627  .priv_data_size = sizeof(MpegDemuxContext),
631  .read_timestamp = mpegps_read_dts,
633 };
634 
635 #if CONFIG_VOBSUB_DEMUXER
636 
637 #define REF_STRING "# VobSub index file,"
638 
639 static int vobsub_probe(AVProbeData *p)
640 {
641  if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
642  return AVPROBE_SCORE_MAX;
643  return 0;
644 }
645 
646 static int vobsub_read_header(AVFormatContext *s)
647 {
648  int i, ret = 0, header_parsed = 0, langidx = 0;
649  MpegDemuxContext *vobsub = s->priv_data;
650  char *sub_name = NULL;
651  size_t fname_len;
652  char *ext, *header_str;
653  AVBPrint header;
654  int64_t delay = 0;
655  AVStream *st = NULL;
656 
657  sub_name = av_strdup(s->filename);
658  fname_len = strlen(sub_name);
659  ext = sub_name - 3 + fname_len;
660  if (fname_len < 4 || *(ext - 1) != '.') {
661  av_log(s, AV_LOG_ERROR, "The input index filename is too short "
662  "to guess the associated .SUB file\n");
663  ret = AVERROR_INVALIDDATA;
664  goto end;
665  }
666  memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
667  av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
668  ret = avformat_open_input(&vobsub->sub_ctx, sub_name, &ff_mpegps_demuxer, NULL);
669  if (ret < 0) {
670  av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
671  goto end;
672  }
673 
675  while (!url_feof(s->pb)) {
676  char line[2048];
677  int len = ff_get_line(s->pb, line, sizeof(line));
678 
679  if (!len)
680  break;
681 
682  line[strcspn(line, "\r\n")] = 0;
683 
684  if (!strncmp(line, "id:", 3)) {
685  int n, stream_id = 0;
686  char id[64] = {0};
687 
688  n = sscanf(line, "id: %63[^,], index: %u", id, &stream_id);
689  if (n != 2) {
690  av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
691  "assuming 'id: und, index: 0'\n", line);
692  strcpy(id, "und");
693  stream_id = 0;
694  }
695 
696  if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
697  av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
698  ret = AVERROR(EINVAL);
699  goto end;
700  }
701 
702  st = avformat_new_stream(s, NULL);
703  if (!st) {
704  ret = AVERROR(ENOMEM);
705  goto end;
706  }
707  st->id = stream_id;
710  avpriv_set_pts_info(st, 64, 1, 1000);
711  av_dict_set(&st->metadata, "language", id, 0);
712  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
713  header_parsed = 1;
714 
715  } else if (st && !strncmp(line, "timestamp:", 10)) {
716  AVPacket *sub;
717  int hh, mm, ss, ms;
718  int64_t pos, timestamp;
719  const char *p = line + 10;
720 
721  if (!s->nb_streams) {
722  av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
723  ret = AVERROR_INVALIDDATA;
724  goto end;
725  }
726 
727  if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
728  &hh, &mm, &ss, &ms, &pos) != 5) {
729  av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
730  "abort parsing\n", line);
731  break;
732  }
733  timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
734  timestamp = av_rescale_q(timestamp, (AVRational){1,1000}, st->time_base);
735 
736  sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
737  if (!sub) {
738  ret = AVERROR(ENOMEM);
739  goto end;
740  }
741  sub->pos = pos;
742  sub->pts = timestamp;
743  sub->stream_index = s->nb_streams - 1;
744 
745  } else if (st && !strncmp(line, "alt:", 4)) {
746  const char *p = line + 4;
747 
748  while (*p == ' ')
749  p++;
750  av_dict_set(&st->metadata, "title", p, 0);
751  av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", st->id, p);
752  header_parsed = 1;
753 
754  } else if (!strncmp(line, "delay:", 6)) {
755  int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
756  const char *p = line + 6;
757 
758  while (*p == ' ')
759  p++;
760  if (*p == '-' || *p == '+') {
761  sign = *p == '-' ? -1 : 1;
762  p++;
763  }
764  sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
765  delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
766 
767  } else if (!strncmp(line, "langidx:", 8)) {
768  const char *p = line + 8;
769 
770  if (sscanf(p, "%d", &langidx) != 1)
771  av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
772 
773  } else if (!header_parsed) {
774  if (line[0] && line[0] != '#')
775  av_bprintf(&header, "%s\n", line);
776  }
777  }
778 
779  if (langidx < s->nb_streams)
781 
782  for (i = 0; i < s->nb_streams; i++) {
783  vobsub->q[i].sort = SUB_SORT_POS_TS;
784  ff_subtitles_queue_finalize(&vobsub->q[i]);
785  }
786 
787  if (!av_bprint_is_complete(&header)) {
788  av_bprint_finalize(&header, NULL);
789  ret = AVERROR(ENOMEM);
790  goto end;
791  }
792  av_bprint_finalize(&header, &header_str);
793  for (i = 0; i < s->nb_streams; i++) {
794  AVStream *sub_st = s->streams[i];
795  sub_st->codec->extradata = av_strdup(header_str);
796  sub_st->codec->extradata_size = header.len;
797  }
798  av_free(header_str);
799 
800 end:
801  av_free(sub_name);
802  return ret;
803 }
804 
805 #define FAIL(r) do { ret = r; goto fail; } while (0)
806 
807 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
808 {
809  MpegDemuxContext *vobsub = s->priv_data;
811  AVIOContext *pb = vobsub->sub_ctx->pb;
812  int ret, psize, total_read = 0, i;
813  AVPacket idx_pkt;
814 
815  int64_t min_ts = INT64_MAX;
816  int sid = 0;
817  for (i = 0; i < s->nb_streams; i++) {
818  FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
819  int64_t ts = tmpq->subs[tmpq->current_sub_idx].pts;
820  if (ts < min_ts) {
821  min_ts = ts;
822  sid = i;
823  }
824  }
825  q = &vobsub->q[sid];
826  ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
827  if (ret < 0)
828  return ret;
829 
830  /* compute maximum packet size using the next packet position. This is
831  * useful when the len in the header is non-sense */
832  if (q->current_sub_idx < q->nb_subs) {
833  psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
834  } else {
835  int64_t fsize = avio_size(pb);
836  psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
837  }
838 
839  avio_seek(pb, idx_pkt.pos, SEEK_SET);
840 
841  av_init_packet(pkt);
842  pkt->size = 0;
843  pkt->data = NULL;
844 
845  do {
846  int n, to_read, startcode;
847  int64_t pts, dts;
848  int64_t old_pos = avio_tell(pb), new_pos;
849  int pkt_size;
850 
851  ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
852  if (ret < 0) {
853  if (pkt->size) // raise packet even if incomplete
854  break;
855  FAIL(ret);
856  }
857  to_read = ret & 0xffff;
858  new_pos = avio_tell(pb);
859  pkt_size = ret + (new_pos - old_pos);
860 
861  /* this prevents reads above the current packet */
862  if (total_read + pkt_size > psize)
863  break;
864  total_read += pkt_size;
865 
866  /* the current chunk doesn't match the stream index (unlikely) */
867  if ((startcode & 0x1f) != idx_pkt.stream_index)
868  break;
869 
870  ret = av_grow_packet(pkt, to_read);
871  if (ret < 0)
872  FAIL(ret);
873 
874  n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
875  if (n < to_read)
876  pkt->size -= to_read - n;
877  } while (total_read < psize);
878 
879  pkt->pts = pkt->dts = idx_pkt.pts;
880  pkt->pos = idx_pkt.pos;
881  pkt->stream_index = idx_pkt.stream_index;
882 
883  av_free_packet(&idx_pkt);
884  return 0;
885 
886 fail:
887  av_free_packet(pkt);
888  av_free_packet(&idx_pkt);
889  return ret;
890 }
891 
892 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
893  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
894 {
895  MpegDemuxContext *vobsub = s->priv_data;
896 
897  /* Rescale requested timestamps based on the first stream (timebase is the
898  * same for all subtitles stream within a .idx/.sub). Rescaling is done just
899  * like in avformat_seek_file(). */
900  if (stream_index == -1 && s->nb_streams != 1) {
901  int i, ret = 0;
902  AVRational time_base = s->streams[0]->time_base;
903  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
904  min_ts = av_rescale_rnd(min_ts, time_base.den,
905  time_base.num * (int64_t)AV_TIME_BASE,
907  max_ts = av_rescale_rnd(max_ts, time_base.den,
908  time_base.num * (int64_t)AV_TIME_BASE,
910  for (i = 0; i < s->nb_streams; i++) {
911  int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
912  min_ts, ts, max_ts, flags);
913  if (r < 0)
914  ret = r;
915  }
916  return ret;
917  }
918 
919  if (stream_index == -1) // only 1 stream
920  stream_index = 0;
921  return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
922  min_ts, ts, max_ts, flags);
923 }
924 
925 static int vobsub_read_close(AVFormatContext *s)
926 {
927  int i;
928  MpegDemuxContext *vobsub = s->priv_data;
929 
930  for (i = 0; i < s->nb_streams; i++)
931  ff_subtitles_queue_clean(&vobsub->q[i]);
932  if (vobsub->sub_ctx)
933  avformat_close_input(&vobsub->sub_ctx);
934  return 0;
935 }
936 
937 AVInputFormat ff_vobsub_demuxer = {
938  .name = "vobsub",
939  .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
940  .priv_data_size = sizeof(MpegDemuxContext),
941  .read_probe = vobsub_probe,
942  .read_header = vobsub_read_header,
943  .read_packet = vobsub_read_packet,
944  .read_seek2 = vobsub_read_seek,
945  .read_close = vobsub_read_close,
946  .flags = AVFMT_SHOW_IDS,
947  .extensions = "idx",
948 };
949 #endif
const char const char void * val
Definition: avisynth_c.h:671
float v
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:279
#define STREAM_TYPE_AUDIO_MPEG2
Definition: mpeg.h:51
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:1675
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:60
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: avcodec.h:4153
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1092
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:487
char * av_strdup(const char *s) av_malloc_attrib
Duplicate the string s.
Definition: mem.c:256
#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:3922
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:261
#define MAX_SYNC_SIZE
Definition: mpeg.c:38
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
int num
numerator
Definition: rational.h:44
int index
stream index in AVFormatContext
Definition: avformat.h:668
int size
Definition: avcodec.h:1064
#define PACK_START_CODE
Definition: mpeg.h:28
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:185
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
sort by position, then timestamps
Definition: subtitles.h:30
static int mpegps_read_pes_header(AVFormatContext *s, int64_t *ppos, int *pstart_code, int64_t *ppts, int64_t *pdts)
Definition: mpeg.c:215
#define STREAM_TYPE_VIDEO_MPEG1
Definition: mpeg.h:48
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:624
discard all
Definition: avcodec.h:618
int ctx_flags
Format-specific flags, see AVFMTCTX_xx.
Definition: avformat.h:1004
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, int len, int merge)
Insert a new subtitle event.
Definition: subtitles.c:26
static int mpegps_read_header(AVFormatContext *s)
Definition: mpeg.c:120
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:471
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
if((e=av_dict_get(options,"", NULL, AV_DICT_IGNORE_SUFFIX)))
Definition: avfilter.c:965
AVDictionary * metadata
Definition: avformat.h:735
Format I/O context.
Definition: avformat.h:968
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:647
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:1607
uint8_t
Round toward +infinity.
Definition: mathematics.h:71
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:96
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:336
enum AVStreamParseType need_parsing
Definition: avformat.h:812
int id
Format-specific stream ID.
Definition: avformat.h:674
#define SYSTEM_HEADER_START_CODE
Definition: mpeg.h:29
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
#define AV_DISPOSITION_DEFAULT
Definition: avformat.h:622
#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: avcodec.h:4163
static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpeg.c:596
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
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:200
#define STREAM_TYPE_AUDIO_AAC
Definition: mpeg.h:54
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:130
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
#define AVFMT_SHOW_IDS
Show format stream IDs numbers.
Definition: avformat.h:349
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:219
#define PRIVATE_STREAM_2
Definition: mpeg.h:39
void * priv_data
Format private data.
Definition: avformat.h:988
char filename[1024]
input or output filename
Definition: avformat.h:1018
unsigned m
Definition: audioconvert.c:186
#define AV_BPRINT_SIZE_UNLIMITED
Convenience macros for special values for av_bprint_init() size_max parameter.
Definition: bprint.h:91
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
static int check_pack_header(const uint8_t *buf)
Definition: mpeg.c:58
const char * r
Definition: vf_curves.c:103
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: avcodec.h:4168
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:398
#define PADDING_STREAM
Definition: mpeg.h:38
Definition: graph2dot.c:48
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
enum AVCodecID codec_id
Definition: mov_chan.c:433
static int64_t ff_parse_pes_pts(const uint8_t *buf)
Parse MPEG-PES five-byte timestamp.
Definition: mpeg.h:67
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1934
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:337
goto fail
Definition: avfilter.c:963
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Init a print buffer.
Definition: bprint.c:69
unsigned int nb_streams
A list of all streams in the file.
Definition: avformat.h:1015
#define FF_ARRAY_ELEMS(a)
Definition: avcodec.h:929
Buffer to print data progressively.
Definition: bprint.h:77
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:117
static int av_bprint_is_complete(AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:182
Opaque data information usually continuous.
Definition: avcodec.h:2233
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avcodec.h:2284
full parsing and repack
Definition: avformat.h:599
#define STREAM_TYPE_VIDEO_H264
Definition: mpeg.h:56
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:54
ret
Definition: avfilter.c:961
AVStream ** streams
Definition: avformat.h:1016
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:341
static int find_next_start_code(AVIOContext *pb, int *size_ptr, int32_t *header_state)
Definition: mpeg.c:151
void * av_malloc(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:73
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:184
int32_t
void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q)
Set missing durations and sort subtitles by PTS, and then byte position.
Definition: subtitles.c:84
#define AUDIO_ID
Definition: mpeg.h:41
static char buffer[20]
Definition: seek-test.c:31
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:199
int n
Definition: avisynth_c.h:588
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:632
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:107
#define STREAM_TYPE_VIDEO_MPEG4
Definition: mpeg.h:55
unsigned char psm_es_type[256]
Definition: mpeg.c:110
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:592
Stream structure.
Definition: avformat.h:667
int imkh_cctv
Definition: mpeg.c:113
int32_t header_state
Definition: mpeg.c:109
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:133
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avcodec.h:2290
int sample_rate
samples per second
Definition: avcodec.h:1873
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:938
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
void * buf
Definition: avisynth_c.h:594
int extradata_size
Definition: avcodec.h:1255
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
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:62
rational number numerator/denominator
Definition: rational.h:43
uint8_t * data
Definition: avcodec.h:1063
#define PROGRAM_STREAM_MAP
Definition: mpeg.h:36
AVMediaType
Definition: avutil.h:180
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:356
#define STREAM_TYPE_AUDIO_AC3
Definition: mpeg.h:59
#define AVINDEX_KEYFRAME
Definition: avformat.h:616
This structure contains the data a format has to probe a file.
Definition: avformat.h:334
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:256
#define type
Round toward -infinity.
Definition: mathematics.h:70
#define FAIL(ERR)
static int64_t get_pts(AVIOContext *pb, int c)
Definition: mpeg.c:141
static uint32_t state
Definition: trasher.c:27
static int flags
Definition: cpu.c:45
#define AVERROR_EOF
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:342
static int mpegps_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpeg.c:444
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:480
int url_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:280
static double c[64]
Main libavformat public API header.
AVPacket * subs
array of subtitles packets
Definition: subtitles.h:34
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:724
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:37
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:49
int den
denominator
Definition: rational.h:45
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:3309
void av_bprintf(AVBPrint *buf, const char *fmt,...) av_printf_format(2
Append a formatted string to a print buffer.
Flag to pass INT64_MIN/MAX through instead of rescaling, this avoids special cases for AV_NOPTS_VALUE...
Definition: mathematics.h:73
#define AV_RB32(x)
Definition: intreadwrite.h:258
#define AVERROR_INVALIDDATA
int len
int channels
number of audio channels
Definition: avcodec.h:1874
#define STREAM_TYPE_VIDEO_MPEG2
Definition: mpeg.h:49
#define AVERROR(e)
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:609
int64_t dts
Decompression timestamp in AVStream-&gt;time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1062
static AVPacket pkt
Definition: demuxing.c:52
int stream_index
Definition: avcodec.h:1065
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:703
#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:726
#define STREAM_TYPE_AUDIO_MPEG1
Definition: mpeg.h:50
int request_probe
stream probing state -1 -&gt; probing finished 0 -&gt; no probing requested rest -&gt; perform probing with re...
Definition: avformat.h:858
This structure stores compressed data.
Definition: avcodec.h:1040
int nb_subs
number of subtitles packets
Definition: subtitles.h:35
int64_t pts
Presentation timestamp in AVStream-&gt;time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1056
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avcodec.h:2278
AVInputFormat ff_mpegps_demuxer
Definition: mpeg.c:624
static int mpegps_probe(AVProbeData *p)
Definition: mpeg.c:62