Libav
avidec.c
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1 /*
2  * AVI demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <inttypes.h>
23 
24 #include "libavutil/avstring.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/mathematics.h"
30 #include "avformat.h"
31 #include "avi.h"
32 #include "dv.h"
33 #include "internal.h"
34 #include "riff.h"
35 
36 #undef NDEBUG
37 #include <assert.h>
38 
39 typedef struct AVIStream {
40  int64_t frame_offset; /* current frame (video) or byte (audio) counter
41  * (used to compute the pts) */
42  int remaining;
44 
45  uint32_t scale;
46  uint32_t rate;
47  int sample_size; /* size of one sample (or packet)
48  * (in the rate/scale sense) in bytes */
49 
50  int64_t cum_len; /* temporary storage (used during seek) */
51  int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
53  uint32_t pal[256];
54  int has_pal;
55  int dshow_block_align; /* block align variable used to emulate bugs in
56  * the MS dshow demuxer */
57 
61 } AVIStream;
62 
63 typedef struct {
64  int64_t riff_end;
65  int64_t movi_end;
66  int64_t fsize;
67  int64_t movi_list;
68  int64_t last_pkt_pos;
70  int is_odml;
75 #define MAX_ODML_DEPTH 1000
76 } AVIContext;
77 
78 static const char avi_headers[][8] = {
79  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
80  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
81  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
82  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
83  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
84  { 0 }
85 };
86 
88  { "strn", "title" },
89  { 0 },
90 };
91 
92 static int avi_load_index(AVFormatContext *s);
93 static int guess_ni_flag(AVFormatContext *s);
94 
95 #define print_tag(str, tag, size) \
96  av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
97  str, tag & 0xff, \
98  (tag >> 8) & 0xff, \
99  (tag >> 16) & 0xff, \
100  (tag >> 24) & 0xff, \
101  size)
102 
103 static inline int get_duration(AVIStream *ast, int len)
104 {
105  if (ast->sample_size)
106  return len;
107  else if (ast->dshow_block_align)
108  return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
109  else
110  return 1;
111 }
112 
114 {
115  AVIContext *avi = s->priv_data;
116  char header[8];
117  int i;
118 
119  /* check RIFF header */
120  avio_read(pb, header, 4);
121  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
122  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
123  avio_read(pb, header + 4, 4);
124 
125  for (i = 0; avi_headers[i][0]; i++)
126  if (!memcmp(header, avi_headers[i], 8))
127  break;
128  if (!avi_headers[i][0])
129  return AVERROR_INVALIDDATA;
130 
131  if (header[7] == 0x19)
132  av_log(s, AV_LOG_INFO,
133  "This file has been generated by a totally broken muxer.\n");
134 
135  return 0;
136 }
137 
138 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
139 {
140  AVIContext *avi = s->priv_data;
141  AVIOContext *pb = s->pb;
142  int longs_pre_entry = avio_rl16(pb);
143  int index_sub_type = avio_r8(pb);
144  int index_type = avio_r8(pb);
145  int entries_in_use = avio_rl32(pb);
146  int chunk_id = avio_rl32(pb);
147  int64_t base = avio_rl64(pb);
148  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
149  ((chunk_id >> 8 & 0xFF) - '0');
150  AVStream *st;
151  AVIStream *ast;
152  int i;
153  int64_t last_pos = -1;
154  int64_t filesize = avio_size(s->pb);
155 
156  av_dlog(s,
157  "longs_pre_entry:%d index_type:%d entries_in_use:%d "
158  "chunk_id:%X base:%16"PRIX64"\n",
159  longs_pre_entry,
160  index_type,
161  entries_in_use,
162  chunk_id,
163  base);
164 
165  if (stream_id >= s->nb_streams || stream_id < 0)
166  return AVERROR_INVALIDDATA;
167  st = s->streams[stream_id];
168  ast = st->priv_data;
169 
170  if (index_sub_type)
171  return AVERROR_INVALIDDATA;
172 
173  avio_rl32(pb);
174 
175  if (index_type && longs_pre_entry != 2)
176  return AVERROR_INVALIDDATA;
177  if (index_type > 1)
178  return AVERROR_INVALIDDATA;
179 
180  if (filesize > 0 && base >= filesize) {
181  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
182  if (base >> 32 == (base & 0xFFFFFFFF) &&
183  (base & 0xFFFFFFFF) < filesize &&
184  filesize <= 0xFFFFFFFF)
185  base &= 0xFFFFFFFF;
186  else
187  return AVERROR_INVALIDDATA;
188  }
189 
190  for (i = 0; i < entries_in_use; i++) {
191  if (index_type) {
192  int64_t pos = avio_rl32(pb) + base - 8;
193  int len = avio_rl32(pb);
194  int key = len >= 0;
195  len &= 0x7FFFFFFF;
196 
197  av_dlog(s, "pos:%"PRId64", len:%X\n", pos, len);
198 
199  if (pb->eof_reached)
200  return AVERROR_INVALIDDATA;
201 
202  if (last_pos == pos || pos == base - 8)
203  avi->non_interleaved = 1;
204  if (last_pos != pos && (len || !ast->sample_size))
205  av_add_index_entry(st, pos, ast->cum_len, len, 0,
206  key ? AVINDEX_KEYFRAME : 0);
207 
208  ast->cum_len += get_duration(ast, len);
209  last_pos = pos;
210  } else {
211  int64_t offset, pos;
212  int duration;
213  offset = avio_rl64(pb);
214  avio_rl32(pb); /* size */
215  duration = avio_rl32(pb);
216 
217  if (pb->eof_reached)
218  return AVERROR_INVALIDDATA;
219 
220  pos = avio_tell(pb);
221 
222  if (avi->odml_depth > MAX_ODML_DEPTH) {
223  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
224  return AVERROR_INVALIDDATA;
225  }
226 
227  avio_seek(pb, offset + 8, SEEK_SET);
228  avi->odml_depth++;
229  read_braindead_odml_indx(s, frame_num);
230  avi->odml_depth--;
231  frame_num += duration;
232 
233  avio_seek(pb, pos, SEEK_SET);
234  }
235  }
236  avi->index_loaded = 1;
237  return 0;
238 }
239 
241 {
242  int i;
243  int64_t j;
244 
245  for (i = 0; i < s->nb_streams; i++) {
246  AVStream *st = s->streams[i];
247  AVIStream *ast = st->priv_data;
248  int n = st->nb_index_entries;
249  int max = ast->sample_size;
250  int64_t pos, size, ts;
251 
252  if (n != 1 || ast->sample_size == 0)
253  continue;
254 
255  while (max < 1024)
256  max += max;
257 
258  pos = st->index_entries[0].pos;
259  size = st->index_entries[0].size;
260  ts = st->index_entries[0].timestamp;
261 
262  for (j = 0; j < size; j += max)
263  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
265  }
266 }
267 
268 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
269  uint32_t size)
270 {
271  AVIOContext *pb = s->pb;
272  char key[5] = { 0 };
273  char *value;
274 
275  size += (size & 1);
276 
277  if (size == UINT_MAX)
278  return AVERROR(EINVAL);
279  value = av_malloc(size + 1);
280  if (!value)
281  return AVERROR(ENOMEM);
282  avio_read(pb, value, size);
283  value[size] = 0;
284 
285  AV_WL32(key, tag);
286 
287  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
289 }
290 
291 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
292  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
293 
294 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
295 {
296  char month[4], time[9], buffer[64];
297  int i, day, year;
298  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
299  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
300  month, &day, time, &year) == 4) {
301  for (i = 0; i < 12; i++)
302  if (!av_strcasecmp(month, months[i])) {
303  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
304  year, i + 1, day, time);
305  av_dict_set(metadata, "creation_time", buffer, 0);
306  }
307  } else if (date[4] == '/' && date[7] == '/') {
308  date[4] = date[7] = '-';
309  av_dict_set(metadata, "creation_time", date, 0);
310  }
311 }
312 
313 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
314 {
315  while (avio_tell(s->pb) < end) {
316  uint32_t tag = avio_rl32(s->pb);
317  uint32_t size = avio_rl32(s->pb);
318  switch (tag) {
319  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
320  {
321  uint64_t tag_end = avio_tell(s->pb) + size;
322  while (avio_tell(s->pb) < tag_end) {
323  uint16_t tag = avio_rl16(s->pb);
324  uint16_t size = avio_rl16(s->pb);
325  const char *name = NULL;
326  char buffer[64] = { 0 };
327  size -= avio_read(s->pb, buffer,
328  FFMIN(size, sizeof(buffer) - 1));
329  switch (tag) {
330  case 0x03:
331  name = "maker";
332  break;
333  case 0x04:
334  name = "model";
335  break;
336  case 0x13:
337  name = "creation_time";
338  if (buffer[4] == ':' && buffer[7] == ':')
339  buffer[4] = buffer[7] = '-';
340  break;
341  }
342  if (name)
343  av_dict_set(&s->metadata, name, buffer, 0);
344  avio_skip(s->pb, size);
345  }
346  break;
347  }
348  default:
349  avio_skip(s->pb, size);
350  break;
351  }
352  }
353 }
354 
356 {
357  AVIContext *avi = s->priv_data;
358  AVIOContext *pb = s->pb;
359  unsigned int tag, tag1, handler;
360  int codec_type, stream_index, frame_period;
361  unsigned int size;
362  int i;
363  AVStream *st;
364  AVIStream *ast = NULL;
365  int avih_width = 0, avih_height = 0;
366  int amv_file_format = 0;
367  uint64_t list_end = 0;
368  int ret;
369 
370  avi->stream_index = -1;
371 
372  ret = get_riff(s, pb);
373  if (ret < 0)
374  return ret;
375 
376  avi->fsize = avio_size(pb);
377  if (avi->fsize <= 0)
378  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
379 
380  /* first list tag */
381  stream_index = -1;
382  codec_type = -1;
383  frame_period = 0;
384  for (;;) {
385  if (pb->eof_reached)
386  goto fail;
387  tag = avio_rl32(pb);
388  size = avio_rl32(pb);
389 
390  print_tag("tag", tag, size);
391 
392  switch (tag) {
393  case MKTAG('L', 'I', 'S', 'T'):
394  list_end = avio_tell(pb) + size;
395  /* Ignored, except at start of video packets. */
396  tag1 = avio_rl32(pb);
397 
398  print_tag("list", tag1, 0);
399 
400  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
401  avi->movi_list = avio_tell(pb) - 4;
402  if (size)
403  avi->movi_end = avi->movi_list + size + (size & 1);
404  else
405  avi->movi_end = avio_size(pb);
406  av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
407  goto end_of_header;
408  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
409  ff_read_riff_info(s, size - 4);
410  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
411  avi_read_nikon(s, list_end);
412 
413  break;
414  case MKTAG('I', 'D', 'I', 'T'):
415  {
416  unsigned char date[64] = { 0 };
417  size += (size & 1);
418  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
419  avio_skip(pb, size);
421  break;
422  }
423  case MKTAG('d', 'm', 'l', 'h'):
424  avi->is_odml = 1;
425  avio_skip(pb, size + (size & 1));
426  break;
427  case MKTAG('a', 'm', 'v', 'h'):
428  amv_file_format = 1;
429  case MKTAG('a', 'v', 'i', 'h'):
430  /* AVI header */
431  /* using frame_period is bad idea */
432  frame_period = avio_rl32(pb);
433  avio_skip(pb, 4);
434  avio_rl32(pb);
436 
437  avio_skip(pb, 2 * 4);
438  avio_rl32(pb);
439  avio_rl32(pb);
440  avih_width = avio_rl32(pb);
441  avih_height = avio_rl32(pb);
442 
443  avio_skip(pb, size - 10 * 4);
444  break;
445  case MKTAG('s', 't', 'r', 'h'):
446  /* stream header */
447 
448  tag1 = avio_rl32(pb);
449  handler = avio_rl32(pb); /* codec tag */
450 
451  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
452  avio_skip(pb, size - 8);
453  break;
454  } else {
455  stream_index++;
456  st = avformat_new_stream(s, NULL);
457  if (!st)
458  goto fail;
459 
460  st->id = stream_index;
461  ast = av_mallocz(sizeof(AVIStream));
462  if (!ast)
463  goto fail;
464  st->priv_data = ast;
465  }
466  if (amv_file_format)
467  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
468  : MKTAG('v', 'i', 'd', 's');
469 
470  print_tag("strh", tag1, -1);
471 
472  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
473  tag1 == MKTAG('i', 'v', 'a', 's')) {
474  int64_t dv_dur;
475 
476  /* After some consideration -- I don't think we
477  * have to support anything but DV in type1 AVIs. */
478  if (s->nb_streams != 1)
479  goto fail;
480 
481  if (handler != MKTAG('d', 'v', 's', 'd') &&
482  handler != MKTAG('d', 'v', 'h', 'd') &&
483  handler != MKTAG('d', 'v', 's', 'l'))
484  goto fail;
485 
486  ast = s->streams[0]->priv_data;
487  av_freep(&s->streams[0]->codec->extradata);
488  av_freep(&s->streams[0]->codec);
489  av_freep(&s->streams[0]->info);
490  av_freep(&s->streams[0]);
491  s->nb_streams = 0;
492  if (CONFIG_DV_DEMUXER) {
493  avi->dv_demux = avpriv_dv_init_demux(s);
494  if (!avi->dv_demux)
495  goto fail;
496  } else
497  goto fail;
498  s->streams[0]->priv_data = ast;
499  avio_skip(pb, 3 * 4);
500  ast->scale = avio_rl32(pb);
501  ast->rate = avio_rl32(pb);
502  avio_skip(pb, 4); /* start time */
503 
504  dv_dur = avio_rl32(pb);
505  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
506  dv_dur *= AV_TIME_BASE;
507  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
508  }
509  /* else, leave duration alone; timing estimation in utils.c
510  * will make a guess based on bitrate. */
511 
512  stream_index = s->nb_streams - 1;
513  avio_skip(pb, size - 9 * 4);
514  break;
515  }
516 
517  assert(stream_index < s->nb_streams);
518  st->codec->stream_codec_tag = handler;
519 
520  avio_rl32(pb); /* flags */
521  avio_rl16(pb); /* priority */
522  avio_rl16(pb); /* language */
523  avio_rl32(pb); /* initial frame */
524  ast->scale = avio_rl32(pb);
525  ast->rate = avio_rl32(pb);
526  if (!(ast->scale && ast->rate)) {
528  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
529  "(This file has been generated by broken software.)\n",
530  ast->scale,
531  ast->rate);
532  if (frame_period) {
533  ast->rate = 1000000;
534  ast->scale = frame_period;
535  } else {
536  ast->rate = 25;
537  ast->scale = 1;
538  }
539  }
540  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
541 
542  ast->cum_len = avio_rl32(pb); /* start */
543  st->nb_frames = avio_rl32(pb);
544 
545  st->start_time = 0;
546  avio_rl32(pb); /* buffer size */
547  avio_rl32(pb); /* quality */
548  ast->sample_size = avio_rl32(pb); /* sample ssize */
549  ast->cum_len *= FFMAX(1, ast->sample_size);
550  av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
551  ast->rate, ast->scale, ast->sample_size);
552 
553  switch (tag1) {
554  case MKTAG('v', 'i', 'd', 's'):
555  codec_type = AVMEDIA_TYPE_VIDEO;
556 
557  ast->sample_size = 0;
558  break;
559  case MKTAG('a', 'u', 'd', 's'):
560  codec_type = AVMEDIA_TYPE_AUDIO;
561  break;
562  case MKTAG('t', 'x', 't', 's'):
563  codec_type = AVMEDIA_TYPE_SUBTITLE;
564  break;
565  case MKTAG('d', 'a', 't', 's'):
566  codec_type = AVMEDIA_TYPE_DATA;
567  break;
568  default:
569  av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
570  goto fail;
571  }
572  if (ast->sample_size == 0)
573  st->duration = st->nb_frames;
574  ast->frame_offset = ast->cum_len;
575  avio_skip(pb, size - 12 * 4);
576  break;
577  case MKTAG('s', 't', 'r', 'f'):
578  /* stream header */
579  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
580  avio_skip(pb, size);
581  } else {
582  uint64_t cur_pos = avio_tell(pb);
583  if (cur_pos < list_end)
584  size = FFMIN(size, list_end - cur_pos);
585  st = s->streams[stream_index];
586  switch (codec_type) {
587  case AVMEDIA_TYPE_VIDEO:
588  if (amv_file_format) {
589  st->codec->width = avih_width;
590  st->codec->height = avih_height;
593  avio_skip(pb, size);
594  break;
595  }
596  tag1 = ff_get_bmp_header(pb, st);
597 
598  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
599  tag1 == MKTAG('D', 'X', 'S', 'A')) {
601  st->codec->codec_tag = tag1;
603  break;
604  }
605 
606  if (size > 10 * 4 && size < (1 << 30)) {
607  st->codec->extradata_size = size - 10 * 4;
610  if (!st->codec->extradata) {
611  st->codec->extradata_size = 0;
612  return AVERROR(ENOMEM);
613  }
614  avio_read(pb,
615  st->codec->extradata,
616  st->codec->extradata_size);
617  }
618 
619  // FIXME: check if the encoder really did this correctly
620  if (st->codec->extradata_size & 1)
621  avio_r8(pb);
622 
623  /* Extract palette from extradata if bpp <= 8.
624  * This code assumes that extradata contains only palette.
625  * This is true for all paletted codecs implemented in
626  * Libav. */
627  if (st->codec->extradata_size &&
628  (st->codec->bits_per_coded_sample <= 8)) {
629  int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
630  const uint8_t *pal_src;
631 
632  pal_size = FFMIN(pal_size, st->codec->extradata_size);
633  pal_src = st->codec->extradata +
634  st->codec->extradata_size - pal_size;
635 #if HAVE_BIGENDIAN
636  for (i = 0; i < pal_size / 4; i++)
637  ast->pal[i] = av_bswap32(((uint32_t *)pal_src)[i]);
638 #else
639  memcpy(ast->pal, pal_src, pal_size);
640 #endif
641  ast->has_pal = 1;
642  }
643 
644  print_tag("video", tag1, 0);
645 
647  st->codec->codec_tag = tag1;
649  tag1);
650  /* This is needed to get the pict type which is necessary
651  * for generating correct pts. */
653  // Support "Resolution 1:1" for Avid AVI Codec
654  if (tag1 == MKTAG('A', 'V', 'R', 'n') &&
655  st->codec->extradata_size >= 31 &&
656  !memcmp(&st->codec->extradata[28], "1:1", 3))
658 
659  if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
660  st->codec->extradata_size < 1U << 30) {
661  st->codec->extradata_size += 9;
662  if ((ret = av_reallocp(&st->codec->extradata,
663  st->codec->extradata_size +
665  st->codec->extradata_size = 0;
666  return ret;
667  } else
668  memcpy(st->codec->extradata + st->codec->extradata_size - 9,
669  "BottomUp", 9);
670  }
671  st->codec->height = FFABS(st->codec->height);
672 
673 // avio_skip(pb, size - 5 * 4);
674  break;
675  case AVMEDIA_TYPE_AUDIO:
676  ret = ff_get_wav_header(pb, st->codec, size);
677  if (ret < 0)
678  return ret;
679  ast->dshow_block_align = st->codec->block_align;
680  if (ast->sample_size && st->codec->block_align &&
681  ast->sample_size != st->codec->block_align) {
682  av_log(s,
684  "sample size (%d) != block align (%d)\n",
685  ast->sample_size,
686  st->codec->block_align);
687  ast->sample_size = st->codec->block_align;
688  }
689  /* 2-aligned
690  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
691  if (size & 1)
692  avio_skip(pb, 1);
693  /* Force parsing as several audio frames can be in
694  * one packet and timestamps refer to packet start. */
696  /* ADTS header is in extradata, AAC without header must be
697  * stored as exact frames. Parser not needed and it will
698  * fail. */
699  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
700  st->codec->extradata_size)
702  /* AVI files with Xan DPCM audio (wrongly) declare PCM
703  * audio in the header but have Axan as stream_code_tag. */
704  if (st->codec->stream_codec_tag == AV_RL32("Axan")) {
706  st->codec->codec_tag = 0;
707  }
708  if (amv_file_format) {
710  ast->dshow_block_align = 0;
711  }
712  break;
716  break;
717  default:
720  st->codec->codec_tag = 0;
721  avio_skip(pb, size);
722  break;
723  }
724  }
725  break;
726  case MKTAG('i', 'n', 'd', 'x'):
727  i = avio_tell(pb);
728  if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
729  read_braindead_odml_indx(s, 0) < 0 &&
731  goto fail;
732  avio_seek(pb, i + size, SEEK_SET);
733  break;
734  case MKTAG('v', 'p', 'r', 'p'):
735  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
736  AVRational active, active_aspect;
737 
738  st = s->streams[stream_index];
739  avio_rl32(pb);
740  avio_rl32(pb);
741  avio_rl32(pb);
742  avio_rl32(pb);
743  avio_rl32(pb);
744 
745  active_aspect.den = avio_rl16(pb);
746  active_aspect.num = avio_rl16(pb);
747  active.num = avio_rl32(pb);
748  active.den = avio_rl32(pb);
749  avio_rl32(pb); // nbFieldsPerFrame
750 
751  if (active_aspect.num && active_aspect.den &&
752  active.num && active.den) {
753  st->sample_aspect_ratio = av_div_q(active_aspect, active);
754  av_dlog(s, "vprp %d/%d %d/%d\n",
755  active_aspect.num, active_aspect.den,
756  active.num, active.den);
757  }
758  size -= 9 * 4;
759  }
760  avio_skip(pb, size);
761  break;
762  case MKTAG('s', 't', 'r', 'n'):
763  if (s->nb_streams) {
764  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
765  if (ret < 0)
766  return ret;
767  break;
768  }
769  default:
770  if (size > 1000000) {
771  av_log(s, AV_LOG_ERROR,
772  "Something went wrong during header parsing, "
773  "I will ignore it and try to continue anyway.\n");
775  goto fail;
776  avi->movi_list = avio_tell(pb) - 4;
777  avi->movi_end = avio_size(pb);
778  goto end_of_header;
779  }
780  /* skip tag */
781  size += (size & 1);
782  avio_skip(pb, size);
783  break;
784  }
785  }
786 
787 end_of_header:
788  /* check stream number */
789  if (stream_index != s->nb_streams - 1) {
790 
791 fail:
792  return AVERROR_INVALIDDATA;
793  }
794 
795  if (!avi->index_loaded && pb->seekable)
796  avi_load_index(s);
797  avi->index_loaded = 1;
798 
799  if ((ret = guess_ni_flag(s)) < 0)
800  return ret;
801 
802  avi->non_interleaved |= ret;
803  for (i = 0; i < s->nb_streams; i++) {
804  AVStream *st = s->streams[i];
805  if (st->nb_index_entries)
806  break;
807  }
808  if (i == s->nb_streams && avi->non_interleaved) {
810  "Non-interleaved AVI without index, switching to interleaved\n");
811  avi->non_interleaved = 0;
812  }
813 
814  if (avi->non_interleaved) {
815  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
816  clean_index(s);
817  }
818 
819  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
821 
822  return 0;
823 }
824 
825 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
826 {
827  if (pkt->size >= 7 &&
828  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
829  uint8_t desc[256];
830  int score = AVPROBE_SCORE_EXTENSION, ret;
831  AVIStream *ast = st->priv_data;
832  AVInputFormat *sub_demuxer;
833  AVRational time_base;
834  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
835  pkt->size - 7,
836  0, NULL, NULL, NULL, NULL);
837  AVProbeData pd;
838  unsigned int desc_len = avio_rl32(pb);
839 
840  if (desc_len > pb->buf_end - pb->buf_ptr)
841  goto error;
842 
843  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
844  avio_skip(pb, desc_len - ret);
845  if (*desc)
846  av_dict_set(&st->metadata, "title", desc, 0);
847 
848  avio_rl16(pb); /* flags? */
849  avio_rl32(pb); /* data size */
850 
851  pd = (AVProbeData) { .buf = pb->buf_ptr,
852  .buf_size = pb->buf_end - pb->buf_ptr };
853  if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
854  goto error;
855 
856  if (!(ast->sub_ctx = avformat_alloc_context()))
857  goto error;
858 
859  ast->sub_ctx->pb = pb;
860  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
861  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
862  *st->codec = *ast->sub_ctx->streams[0]->codec;
863  ast->sub_ctx->streams[0]->codec->extradata = NULL;
864  time_base = ast->sub_ctx->streams[0]->time_base;
865  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
866  }
867  ast->sub_buffer = pkt->data;
868  memset(pkt, 0, sizeof(*pkt));
869  return 1;
870 
871 error:
872  av_freep(&pb);
873  }
874  return 0;
875 }
876 
878  AVPacket *pkt)
879 {
880  AVIStream *ast, *next_ast = next_st->priv_data;
881  int64_t ts, next_ts, ts_min = INT64_MAX;
882  AVStream *st, *sub_st = NULL;
883  int i;
884 
885  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
887 
888  for (i = 0; i < s->nb_streams; i++) {
889  st = s->streams[i];
890  ast = st->priv_data;
891  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
893  if (ts <= next_ts && ts < ts_min) {
894  ts_min = ts;
895  sub_st = st;
896  }
897  }
898  }
899 
900  if (sub_st) {
901  ast = sub_st->priv_data;
902  *pkt = ast->sub_pkt;
903  pkt->stream_index = sub_st->index;
904 
905  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
906  ast->sub_pkt.data = NULL;
907  }
908  return sub_st;
909 }
910 
911 static int get_stream_idx(int *d)
912 {
913  if (d[0] >= '0' && d[0] <= '9' &&
914  d[1] >= '0' && d[1] <= '9') {
915  return (d[0] - '0') * 10 + (d[1] - '0');
916  } else {
917  return 100; // invalid stream ID
918  }
919 }
920 
921 static int avi_sync(AVFormatContext *s, int exit_early)
922 {
923  AVIContext *avi = s->priv_data;
924  AVIOContext *pb = s->pb;
925  int n;
926  unsigned int d[8];
927  unsigned int size;
928  int64_t i, sync;
929 
930 start_sync:
931  memset(d, -1, sizeof(d));
932  for (i = sync = avio_tell(pb); !pb->eof_reached; i++) {
933  int j;
934 
935  for (j = 0; j < 7; j++)
936  d[j] = d[j + 1];
937  d[7] = avio_r8(pb);
938 
939  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
940 
941  n = get_stream_idx(d + 2);
942  av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
943  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
944  if (i + (uint64_t)size > avi->fsize || d[0] > 127)
945  continue;
946 
947  // parse ix##
948  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
949  // parse JUNK
950  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
951  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
952  avio_skip(pb, size);
953  goto start_sync;
954  }
955 
956  // parse stray LIST
957  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
958  avio_skip(pb, 4);
959  goto start_sync;
960  }
961 
962  n = avi->dv_demux ? 0 : get_stream_idx(d);
963 
964  if (!((i - avi->last_pkt_pos) & 1) &&
965  get_stream_idx(d + 1) < s->nb_streams)
966  continue;
967 
968  // detect ##ix chunk and skip
969  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
970  avio_skip(pb, size);
971  goto start_sync;
972  }
973 
974  // parse ##dc/##wb
975  if (n < s->nb_streams) {
976  AVStream *st;
977  AVIStream *ast;
978  st = s->streams[n];
979  ast = st->priv_data;
980 
981  if (s->nb_streams >= 2) {
982  AVStream *st1 = s->streams[1];
983  AVIStream *ast1 = st1->priv_data;
984  // workaround for broken small-file-bug402.avi
985  if (d[2] == 'w' && d[3] == 'b' && n == 0 &&
988  ast->prefix == 'd' * 256 + 'c' &&
989  (d[2] * 256 + d[3] == ast1->prefix ||
990  !ast1->prefix_count)) {
991  n = 1;
992  st = st1;
993  ast = ast1;
995  "Invalid stream + prefix combination, assuming audio.\n");
996  }
997  }
998 
999  if (!avi->dv_demux &&
1000  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1001  // FIXME: needs a little reordering
1002  (st->discard >= AVDISCARD_NONKEY &&
1003  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1004  || st->discard >= AVDISCARD_ALL)) {
1005  if (!exit_early) {
1006  ast->frame_offset += get_duration(ast, size);
1007  }
1008  avio_skip(pb, size);
1009  goto start_sync;
1010  }
1011 
1012  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1013  int k = avio_r8(pb);
1014  int last = (k + avio_r8(pb) - 1) & 0xFF;
1015 
1016  avio_rl16(pb); // flags
1017 
1018  // b + (g << 8) + (r << 16);
1019  for (; k <= last; k++)
1020  ast->pal[k] = avio_rb32(pb) >> 8;
1021 
1022  ast->has_pal = 1;
1023  goto start_sync;
1024  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1025  d[2] < 128 && d[3] < 128) ||
1026  d[2] * 256 + d[3] == ast->prefix /* ||
1027  (d[2] == 'd' && d[3] == 'c') ||
1028  (d[2] == 'w' && d[3] == 'b') */) {
1029  if (exit_early)
1030  return 0;
1031  if (d[2] * 256 + d[3] == ast->prefix)
1032  ast->prefix_count++;
1033  else {
1034  ast->prefix = d[2] * 256 + d[3];
1035  ast->prefix_count = 0;
1036  }
1037 
1038  avi->stream_index = n;
1039  ast->packet_size = size + 8;
1040  ast->remaining = size;
1041 
1042  if (size || !ast->sample_size) {
1043  uint64_t pos = avio_tell(pb) - 8;
1044  if (!st->index_entries || !st->nb_index_entries ||
1045  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1046  av_add_index_entry(st, pos, ast->frame_offset, size,
1047  0, AVINDEX_KEYFRAME);
1048  }
1049  }
1050  return 0;
1051  }
1052  }
1053  }
1054 
1055  return AVERROR_EOF;
1056 }
1057 
1059 {
1060  AVIContext *avi = s->priv_data;
1061  AVIOContext *pb = s->pb;
1062  int err;
1063 #if FF_API_DESTRUCT_PACKET
1064  void *dstr;
1065 #endif
1066 
1067  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1068  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1069  if (size >= 0)
1070  return size;
1071  else
1072  goto resync;
1073  }
1074 
1075  if (avi->non_interleaved) {
1076  int best_stream_index = 0;
1077  AVStream *best_st = NULL;
1078  AVIStream *best_ast;
1079  int64_t best_ts = INT64_MAX;
1080  int i;
1081 
1082  for (i = 0; i < s->nb_streams; i++) {
1083  AVStream *st = s->streams[i];
1084  AVIStream *ast = st->priv_data;
1085  int64_t ts = ast->frame_offset;
1086  int64_t last_ts;
1087 
1088  if (!st->nb_index_entries)
1089  continue;
1090 
1091  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1092  if (!ast->remaining && ts > last_ts)
1093  continue;
1094 
1095  ts = av_rescale_q(ts, st->time_base,
1096  (AVRational) { FFMAX(1, ast->sample_size),
1097  AV_TIME_BASE });
1098 
1099  av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1100  st->time_base.num, st->time_base.den, ast->frame_offset);
1101  if (ts < best_ts) {
1102  best_ts = ts;
1103  best_st = st;
1104  best_stream_index = i;
1105  }
1106  }
1107  if (!best_st)
1108  return AVERROR_EOF;
1109 
1110  best_ast = best_st->priv_data;
1111  best_ts = av_rescale_q(best_ts,
1112  (AVRational) { FFMAX(1, best_ast->sample_size),
1113  AV_TIME_BASE },
1114  best_st->time_base);
1115  if (best_ast->remaining) {
1116  i = av_index_search_timestamp(best_st,
1117  best_ts,
1118  AVSEEK_FLAG_ANY |
1120  } else {
1121  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1122  if (i >= 0)
1123  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1124  }
1125 
1126  if (i >= 0) {
1127  int64_t pos = best_st->index_entries[i].pos;
1128  pos += best_ast->packet_size - best_ast->remaining;
1129  avio_seek(s->pb, pos + 8, SEEK_SET);
1130 
1131  assert(best_ast->remaining <= best_ast->packet_size);
1132 
1133  avi->stream_index = best_stream_index;
1134  if (!best_ast->remaining)
1135  best_ast->packet_size =
1136  best_ast->remaining = best_st->index_entries[i].size;
1137  }
1138  }
1139 
1140 resync:
1141  if (avi->stream_index >= 0) {
1142  AVStream *st = s->streams[avi->stream_index];
1143  AVIStream *ast = st->priv_data;
1144  int size, err;
1145 
1146  if (get_subtitle_pkt(s, st, pkt))
1147  return 0;
1148 
1149  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1150  if (ast->sample_size <= 1)
1151  size = INT_MAX;
1152  else if (ast->sample_size < 32)
1153  // arbitrary multiplier to avoid tiny packets for raw PCM data
1154  size = 1024 * ast->sample_size;
1155  else
1156  size = ast->sample_size;
1157 
1158  if (size > ast->remaining)
1159  size = ast->remaining;
1160  avi->last_pkt_pos = avio_tell(pb);
1161  err = av_get_packet(pb, pkt, size);
1162  if (err < 0)
1163  return err;
1164 
1165  if (ast->has_pal && pkt->data && pkt->size < (unsigned)INT_MAX / 2) {
1166  uint8_t *pal;
1167  pal = av_packet_new_side_data(pkt,
1169  AVPALETTE_SIZE);
1170  if (!pal) {
1171  av_log(s, AV_LOG_ERROR,
1172  "Failed to allocate data for palette\n");
1173  } else {
1174  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1175  ast->has_pal = 0;
1176  }
1177  }
1178 
1179  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1180  AVBufferRef *avbuf = pkt->buf;
1181 #if FF_API_DESTRUCT_PACKET
1183  dstr = pkt->destruct;
1185 #endif
1186  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1187  pkt->data, pkt->size);
1188 #if FF_API_DESTRUCT_PACKET
1190  pkt->destruct = dstr;
1192 #endif
1193  pkt->buf = avbuf;
1194  pkt->flags |= AV_PKT_FLAG_KEY;
1195  if (size < 0)
1196  av_free_packet(pkt);
1197  } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1198  !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1199  ast->frame_offset++;
1200  avi->stream_index = -1;
1201  ast->remaining = 0;
1202  goto resync;
1203  } else {
1204  /* XXX: How to handle B-frames in AVI? */
1205  pkt->dts = ast->frame_offset;
1206 // pkt->dts += ast->start;
1207  if (ast->sample_size)
1208  pkt->dts /= ast->sample_size;
1209  av_dlog(s,
1210  "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1211  "base:%d st:%d size:%d\n",
1212  pkt->dts,
1213  ast->frame_offset,
1214  ast->scale,
1215  ast->rate,
1216  ast->sample_size,
1217  AV_TIME_BASE,
1218  avi->stream_index,
1219  size);
1220  pkt->stream_index = avi->stream_index;
1221 
1222  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1223  AVIndexEntry *e;
1224  int index;
1225  assert(st->index_entries);
1226 
1227  index = av_index_search_timestamp(st, ast->frame_offset, 0);
1228  e = &st->index_entries[index];
1229 
1230  if (index >= 0 && e->timestamp == ast->frame_offset)
1231  if (e->flags & AVINDEX_KEYFRAME)
1232  pkt->flags |= AV_PKT_FLAG_KEY;
1233  } else {
1234  pkt->flags |= AV_PKT_FLAG_KEY;
1235  }
1236  ast->frame_offset += get_duration(ast, pkt->size);
1237  }
1238  ast->remaining -= err;
1239  if (!ast->remaining) {
1240  avi->stream_index = -1;
1241  ast->packet_size = 0;
1242  }
1243 
1244  return 0;
1245  }
1246 
1247  if ((err = avi_sync(s, 0)) < 0)
1248  return err;
1249  goto resync;
1250 }
1251 
1252 /* XXX: We make the implicit supposition that the positions are sorted
1253  * for each stream. */
1255 {
1256  AVIContext *avi = s->priv_data;
1257  AVIOContext *pb = s->pb;
1258  int nb_index_entries, i;
1259  AVStream *st;
1260  AVIStream *ast;
1261  unsigned int index, tag, flags, pos, len, first_packet = 1;
1262  unsigned last_pos = -1;
1263  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1264 
1265  nb_index_entries = size / 16;
1266  if (nb_index_entries <= 0)
1267  return AVERROR_INVALIDDATA;
1268 
1269  idx1_pos = avio_tell(pb);
1270  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1271  if (avi_sync(s, 1) == 0)
1272  first_packet_pos = avio_tell(pb) - 8;
1273  avi->stream_index = -1;
1274  avio_seek(pb, idx1_pos, SEEK_SET);
1275 
1276  /* Read the entries and sort them in each stream component. */
1277  for (i = 0; i < nb_index_entries; i++) {
1278  tag = avio_rl32(pb);
1279  flags = avio_rl32(pb);
1280  pos = avio_rl32(pb);
1281  len = avio_rl32(pb);
1282  av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1283  i, tag, flags, pos, len);
1284 
1285  index = ((tag & 0xff) - '0') * 10;
1286  index += (tag >> 8 & 0xff) - '0';
1287  if (index >= s->nb_streams)
1288  continue;
1289  st = s->streams[index];
1290  ast = st->priv_data;
1291 
1292  if (first_packet && first_packet_pos && len) {
1293  data_offset = first_packet_pos - pos;
1294  first_packet = 0;
1295  }
1296  pos += data_offset;
1297 
1298  av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1299 
1300  if (pb->eof_reached)
1301  return AVERROR_INVALIDDATA;
1302 
1303  if (last_pos == pos)
1304  avi->non_interleaved = 1;
1305  else if (len || !ast->sample_size)
1306  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1307  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1308  ast->cum_len += get_duration(ast, len);
1309  last_pos = pos;
1310  }
1311  return 0;
1312 }
1313 
1314 /* Scan the index and consider any file with streams more than
1315  * 2 seconds or 64MB apart non-interleaved. */
1317 {
1318  int64_t min_pos, pos;
1319  int i;
1320  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1321  if (!idx)
1322  return AVERROR(ENOMEM);
1323 
1324  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1325  int64_t max_dts = INT64_MIN / 2;
1326  int64_t min_dts = INT64_MAX / 2;
1327  int64_t max_buffer = 0;
1328 
1329  min_pos = INT64_MAX;
1330 
1331  for (i = 0; i < s->nb_streams; i++) {
1332  AVStream *st = s->streams[i];
1333  AVIStream *ast = st->priv_data;
1334  int n = st->nb_index_entries;
1335  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1336  idx[i]++;
1337  if (idx[i] < n) {
1338  int64_t dts;
1339  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1340  FFMAX(ast->sample_size, 1),
1341  st->time_base, AV_TIME_BASE_Q);
1342  min_dts = FFMIN(min_dts, dts);
1343  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1344  }
1345  }
1346  for (i = 0; i < s->nb_streams; i++) {
1347  AVStream *st = s->streams[i];
1348  AVIStream *ast = st->priv_data;
1349 
1350  if (idx[i] && min_dts != INT64_MAX / 2) {
1351  int64_t dts;
1352  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1353  FFMAX(ast->sample_size, 1),
1354  st->time_base, AV_TIME_BASE_Q);
1355  max_dts = FFMAX(max_dts, dts);
1356  max_buffer = FFMAX(max_buffer,
1357  av_rescale(dts - min_dts,
1358  st->codec->bit_rate,
1359  AV_TIME_BASE));
1360  }
1361  }
1362  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1363  max_buffer > 1024 * 1024 * 8 * 8) {
1364  av_free(idx);
1365  return 1;
1366  }
1367  }
1368  av_free(idx);
1369  return 0;
1370 }
1371 
1373 {
1374  int i;
1375  int64_t last_start = 0;
1376  int64_t first_end = INT64_MAX;
1377  int64_t oldpos = avio_tell(s->pb);
1378 
1379  for (i = 0; i < s->nb_streams; i++) {
1380  AVStream *st = s->streams[i];
1381  int n = st->nb_index_entries;
1382  unsigned int size;
1383 
1384  if (n <= 0)
1385  continue;
1386 
1387  if (n >= 2) {
1388  int64_t pos = st->index_entries[0].pos;
1389  avio_seek(s->pb, pos + 4, SEEK_SET);
1390  size = avio_rl32(s->pb);
1391  if (pos + size > st->index_entries[1].pos)
1392  last_start = INT64_MAX;
1393  }
1394 
1395  if (st->index_entries[0].pos > last_start)
1396  last_start = st->index_entries[0].pos;
1397  if (st->index_entries[n - 1].pos < first_end)
1398  first_end = st->index_entries[n - 1].pos;
1399  }
1400  avio_seek(s->pb, oldpos, SEEK_SET);
1401 
1402  if (last_start > first_end)
1403  return 1;
1404 
1405  return check_stream_max_drift(s);
1406 }
1407 
1409 {
1410  AVIContext *avi = s->priv_data;
1411  AVIOContext *pb = s->pb;
1412  uint32_t tag, size;
1413  int64_t pos = avio_tell(pb);
1414  int ret = -1;
1415 
1416  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1417  goto the_end; // maybe truncated file
1418  av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1419  for (;;) {
1420  if (pb->eof_reached)
1421  break;
1422  tag = avio_rl32(pb);
1423  size = avio_rl32(pb);
1424  av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1425  tag & 0xff,
1426  (tag >> 8) & 0xff,
1427  (tag >> 16) & 0xff,
1428  (tag >> 24) & 0xff,
1429  size);
1430 
1431  if (tag == MKTAG('i', 'd', 'x', '1') &&
1432  avi_read_idx1(s, size) >= 0) {
1433  ret = 0;
1434  break;
1435  }
1436 
1437  size += (size & 1);
1438  if (avio_skip(pb, size) < 0)
1439  break; // something is wrong here
1440  }
1441 
1442 the_end:
1443  avio_seek(pb, pos, SEEK_SET);
1444  return ret;
1445 }
1446 
1447 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1448 {
1449  AVIStream *ast2 = st2->priv_data;
1450  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1451  av_free_packet(&ast2->sub_pkt);
1452  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1453  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1454  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1455 }
1456 
1457 static int avi_read_seek(AVFormatContext *s, int stream_index,
1458  int64_t timestamp, int flags)
1459 {
1460  AVIContext *avi = s->priv_data;
1461  AVStream *st;
1462  int i, index;
1463  int64_t pos;
1464  AVIStream *ast;
1465 
1466  /* Does not matter which stream is requested dv in avi has the
1467  * stream information in the first video stream.
1468  */
1469  if (avi->dv_demux)
1470  stream_index = 0;
1471 
1472  if (!avi->index_loaded) {
1473  /* we only load the index on demand */
1474  avi_load_index(s);
1475  avi->index_loaded = 1;
1476  }
1477 
1478  st = s->streams[stream_index];
1479  ast = st->priv_data;
1480  index = av_index_search_timestamp(st,
1481  timestamp * FFMAX(ast->sample_size, 1),
1482  flags);
1483  if (index < 0)
1484  return AVERROR_INVALIDDATA;
1485 
1486  /* find the position */
1487  pos = st->index_entries[index].pos;
1488  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1489 
1490  av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1491  timestamp, index, st->index_entries[index].timestamp);
1492 
1493  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1494  /* One and only one real stream for DV in AVI, and it has video */
1495  /* offsets. Calling with other stream indexes should have failed */
1496  /* the av_index_search_timestamp call above. */
1497 
1498  /* Feed the DV video stream version of the timestamp to the */
1499  /* DV demux so it can synthesize correct timestamps. */
1500  ff_dv_offset_reset(avi->dv_demux, timestamp);
1501 
1502  avio_seek(s->pb, pos, SEEK_SET);
1503  avi->stream_index = -1;
1504  return 0;
1505  }
1506 
1507  for (i = 0; i < s->nb_streams; i++) {
1508  AVStream *st2 = s->streams[i];
1509  AVIStream *ast2 = st2->priv_data;
1510 
1511  ast2->packet_size =
1512  ast2->remaining = 0;
1513 
1514  if (ast2->sub_ctx) {
1515  seek_subtitle(st, st2, timestamp);
1516  continue;
1517  }
1518 
1519  if (st2->nb_index_entries <= 0)
1520  continue;
1521 
1522 // assert(st2->codec->block_align);
1523  assert((int64_t)st2->time_base.num * ast2->rate ==
1524  (int64_t)st2->time_base.den * ast2->scale);
1525  index = av_index_search_timestamp(st2,
1526  av_rescale_q(timestamp,
1527  st->time_base,
1528  st2->time_base) *
1529  FFMAX(ast2->sample_size, 1),
1530  flags | AVSEEK_FLAG_BACKWARD);
1531  if (index < 0)
1532  index = 0;
1533 
1534  if (!avi->non_interleaved) {
1535  while (index > 0 && st2->index_entries[index].pos > pos)
1536  index--;
1537  while (index + 1 < st2->nb_index_entries &&
1538  st2->index_entries[index].pos < pos)
1539  index++;
1540  }
1541 
1542  av_dlog(s, "%"PRId64" %d %"PRId64"\n",
1543  timestamp, index, st2->index_entries[index].timestamp);
1544  /* extract the current frame number */
1545  ast2->frame_offset = st2->index_entries[index].timestamp;
1546  }
1547 
1548  /* do the seek */
1549  avio_seek(s->pb, pos, SEEK_SET);
1550  avi->stream_index = -1;
1551  return 0;
1552 }
1553 
1555 {
1556  int i;
1557  AVIContext *avi = s->priv_data;
1558 
1559  for (i = 0; i < s->nb_streams; i++) {
1560  AVStream *st = s->streams[i];
1561  AVIStream *ast = st->priv_data;
1562  if (ast) {
1563  if (ast->sub_ctx) {
1564  av_freep(&ast->sub_ctx->pb);
1566  }
1567  av_free(ast->sub_buffer);
1568  av_free_packet(&ast->sub_pkt);
1569  }
1570  }
1571 
1572  av_free(avi->dv_demux);
1573 
1574  return 0;
1575 }
1576 
1577 static int avi_probe(AVProbeData *p)
1578 {
1579  int i;
1580 
1581  /* check file header */
1582  for (i = 0; avi_headers[i][0]; i++)
1583  if (!memcmp(p->buf, avi_headers[i], 4) &&
1584  !memcmp(p->buf + 8, avi_headers[i] + 4, 4))
1585  return AVPROBE_SCORE_MAX;
1586 
1587  return 0;
1588 }
1589 
1591  .name = "avi",
1592  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1593  .priv_data_size = sizeof(AVIContext),
1594  .extensions = "avi",
1595  .read_probe = avi_probe,
1600 };
#define FFMAX(a, b)
Definition: common.h:55
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:175
#define AVPALETTE_SIZE
Definition: avcodec.h:3035
codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it ...
Definition: avcodec.h:464
static AVStream * get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt)
Definition: avidec.c:877
unsigned int stream_codec_tag
fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A')...
Definition: avcodec.h:1090
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:59
uint32_t pal[256]
Definition: avidec.c:53
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:243
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:1181
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:1943
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:171
AVFormatContext * sub_ctx
Definition: avidec.c:58
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
#define MAX_ODML_DEPTH
Definition: avidec.c:75
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:247
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:2821
int64_t pos
Definition: avformat.h:660
int64_t last_pkt_pos
Definition: avidec.c:68
uint32_t rate
Definition: avidec.c:46
#define AV_RL16(x)
Definition: intreadwrite.h:220
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:241
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:769
int dshow_block_align
Definition: avidec.c:55
int num
numerator
Definition: rational.h:44
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:564
int index
stream index in AVFormatContext
Definition: avformat.h:700
int size
Definition: avcodec.h:974
static int sync(AVFormatContext *s, uint8_t *header)
Read input until we find the next ident.
Definition: lxfdec.c:86
int is_odml
Definition: avidec.c:70
enum AVMediaType codec_type
Definition: rtp.c:36
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...
int64_t movi_end
Definition: avidec.c:65
uint32_t scale
Definition: avidec.c:45
static int get_duration(AVIStream *ast, int len)
Definition: avidec.c:103
#define AVIIF_INDEX
Definition: avi.h:36
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)
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:595
discard all
Definition: avcodec.h:568
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1828
static int check_stream_max_drift(AVFormatContext *s)
Definition: avidec.c:1316
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:443
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
static int64_t duration
Definition: avplay.c:246
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:87
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:956
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
AVDictionary * metadata
Definition: avformat.h:771
Format I/O context.
Definition: avformat.h:922
int stream_index
Definition: avidec.c:72
uint8_t
Opaque data information usually continuous.
Definition: avutil.h:189
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1554
attribute_deprecated void(* destruct)(struct AVPacket *)
Definition: avcodec.h:994
int64_t riff_end
Definition: avidec.c:64
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:397
enum AVStreamParseType need_parsing
Definition: avformat.h:867
int id
Format-specific stream ID.
Definition: avformat.h:706
int64_t movi_list
Definition: avidec.c:67
const char * name
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
static void clean_index(AVFormatContext *s)
Definition: avidec.c:240
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1033
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:303
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1035
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:140
static int flags
Definition: log.c:44
uint32_t tag
Definition: movenc.c:844
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:878
void * priv_data
Definition: avformat.h:719
#define AVERROR_EOF
End of file.
Definition: error.h:51
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2507
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2518
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, uint8_t *buf, int buf_size)
Definition: dv.c:343
#define AV_WL32(p, d)
Definition: intreadwrite.h:255
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:117
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1019
int packet_size
Definition: avidec.c:43
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:129
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1222
struct AVStream::@4 * info
void * priv_data
Format private data.
Definition: avformat.h:950
#define AVERROR(e)
Definition: error.h:43
int remaining
Definition: avidec.c:42
int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
Definition: riffdec.c:78
int64_t timestamp
Definition: avformat.h:661
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
AVRational av_div_q(AVRational b, AVRational c) av_const
Divide one rational by another.
Definition: rational.c:87
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
Definition: avidec.c:138
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:548
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
Definition: avidec.c:268
unsigned char * buf_end
End of the data, may be less than buffer+buffer_size if the read function returned less data than req...
Definition: avio.h:85
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:262
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:979
common internal API header
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:978
int prefix_count
Definition: avidec.c:52
int non_interleaved
Definition: avidec.c:71
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:117
int bit_rate
the average bitrate
Definition: avcodec.h:1114
int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:116
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:234
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
Definition: dv.c:414
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:29
int av_strcasecmp(const char *a, const char *b)
Definition: avstring.c:156
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() and chilren.
Definition: dict.h:66
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int64_t cum_len
Definition: avidec.c:50
int width
picture width / height.
Definition: avcodec.h:1224
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:355
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:1611
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:402
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
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:62
#define CONFIG_DV_DEMUXER
Definition: config.h:800
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static const char months[12][4]
Definition: avidec.c:291
static char buffer[20]
Definition: seek-test.c:31
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
Definition: avidec.c:1447
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:84
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:372
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:544
Stream structure.
Definition: avformat.h:699
static const char avi_headers[][8]
Definition: avidec.c:78
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avidec.c:1058
int prefix
Definition: avidec.c:51
static int read_gab2_sub(AVStream *st, AVPacket *pkt)
Definition: avidec.c:825
NULL
Definition: eval.c:55
#define AV_LOG_INFO
Standard information.
Definition: log.h:134
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:240
int index_loaded
Definition: avidec.c:69
static int get_stream_idx(int *d)
Definition: avidec.c:911
int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a UTF-16 string from pb and convert it to UTF-8.
#define AV_EF_EXPLODE
Definition: avcodec.h:2417
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1082
AVIOContext * pb
I/O context.
Definition: avformat.h:964
int extradata_size
Definition: avcodec.h:1165
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:68
AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Allocate and initialize an AVIOContext for buffered I/O.
Definition: aviobuf.c:107
int nb_index_entries
Definition: avformat.h:880
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:1609
static int avi_read_idx1(AVFormatContext *s, int size)
Definition: avidec.c:1254
int index
Definition: gxfenc.c:72
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:572
rational number numerator/denominator
Definition: rational.h:43
uint8_t * data
Definition: avcodec.h:973
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1130
discard useless packets like 0 size packets in avi
Definition: avcodec.h:564
static int avi_probe(AVProbeData *p)
Definition: avidec.c:1577
#define AVINDEX_KEYFRAME
Definition: avformat.h:662
This structure contains the data a format has to probe a file.
Definition: avformat.h:395
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Seek to timestamp ts.
Definition: utils.c:1542
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:421
#define MKTAG(a, b, c, d)
Definition: common.h:238
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1408
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:404
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1590
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:756
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:452
A reference to a data buffer.
Definition: buffer.h:81
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
Definition: avidec.c:313
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
Definition: avidec.c:294
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:76
AVPacket sub_pkt
Definition: avidec.c:59
int64_t start_time
Decoding: pts of the first frame of the stream, in stream time base.
Definition: avformat.h:749
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1152
Main libavformat public API header.
static int get_riff(AVFormatContext *s, AVIOContext *pb)
Definition: avidec.c:113
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:98
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:758
int den
denominator
Definition: rational.h:45
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
Definition: dv.c:326
int sample_size
Definition: avidec.c:47
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:2496
Definition: vf_drawbox.c:37
int eof_reached
true if eof reached
Definition: avio.h:96
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:77
#define AV_RL32(x)
Definition: intreadwrite.h:248
int len
int has_pal
Definition: avidec.c:54
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:655
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1372
#define print_tag(str, tag, size)
Definition: avidec.c:95
int64_t frame_offset
Definition: avidec.c:40
int64_t fsize
Definition: avidec.c:66
int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
Read BITMAPINFOHEADER structure and set AVStream codec width, height and bits_per_encoded_sample fiel...
Definition: riffdec.c:158
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:972
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:205
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1457
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1017
#define FFABS(a)
Definition: common.h:52
int stream_index
Definition: avcodec.h:975
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:741
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:762
int odml_depth
Definition: avidec.c:74
This structure stores compressed data.
Definition: avcodec.h:950
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:921
#define FFMIN(a, b)
Definition: common.h:57
void * av_mallocz(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:205
#define av_bswap32
Definition: bswap.h:33
uint8_t * sub_buffer
Definition: avidec.c:60
Only parse headers, do not repack.
Definition: avformat.h:654
DVDemuxContext * dv_demux
Definition: avidec.c:73