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 "isom.h"
35 #include "riff.h"
36 
37 #undef NDEBUG
38 #include <assert.h>
39 
40 typedef struct AVIStream {
41  int64_t frame_offset; /* current frame (video) or byte (audio) counter
42  * (used to compute the pts) */
43  int remaining;
45 
46  uint32_t handler;
47  uint32_t scale;
48  uint32_t rate;
49  int sample_size; /* size of one sample (or packet)
50  * (in the rate/scale sense) in bytes */
51 
52  int64_t cum_len; /* temporary storage (used during seek) */
53  int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
55  uint32_t pal[256];
56  int has_pal;
57  int dshow_block_align; /* block align variable used to emulate bugs in
58  * the MS dshow demuxer */
59 
63 } AVIStream;
64 
65 typedef struct AVIContext {
66  int64_t riff_end;
67  int64_t movi_end;
68  int64_t fsize;
69  int64_t movi_list;
70  int64_t last_pkt_pos;
72  int is_odml;
77 #define MAX_ODML_DEPTH 1000
78 } AVIContext;
79 
80 static const char avi_headers[][8] = {
81  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
82  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
83  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
84  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
85  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
86  { 0 }
87 };
88 
90  { "strn", "title" },
91  { 0 },
92 };
93 
94 static int avi_load_index(AVFormatContext *s);
95 static int guess_ni_flag(AVFormatContext *s);
96 
97 #define print_tag(str, tag, size) \
98  av_log(NULL, AV_LOG_TRACE, "%s: tag=%c%c%c%c size=0x%x\n", \
99  str, tag & 0xff, \
100  (tag >> 8) & 0xff, \
101  (tag >> 16) & 0xff, \
102  (tag >> 24) & 0xff, \
103  size)
104 
105 static inline int get_duration(AVIStream *ast, int len)
106 {
107  if (ast->sample_size)
108  return len;
109  else if (ast->dshow_block_align)
110  return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
111  else
112  return 1;
113 }
114 
116 {
117  AVIContext *avi = s->priv_data;
118  char header[8];
119  int i;
120 
121  /* check RIFF header */
122  avio_read(pb, header, 4);
123  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
124  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
125  avio_read(pb, header + 4, 4);
126 
127  for (i = 0; avi_headers[i][0]; i++)
128  if (!memcmp(header, avi_headers[i], 8))
129  break;
130  if (!avi_headers[i][0])
131  return AVERROR_INVALIDDATA;
132 
133  if (header[7] == 0x19)
134  av_log(s, AV_LOG_INFO,
135  "This file has been generated by a totally broken muxer.\n");
136 
137  return 0;
138 }
139 
140 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
141 {
142  AVIContext *avi = s->priv_data;
143  AVIOContext *pb = s->pb;
144  int longs_pre_entry = avio_rl16(pb);
145  int index_sub_type = avio_r8(pb);
146  int index_type = avio_r8(pb);
147  int entries_in_use = avio_rl32(pb);
148  int chunk_id = avio_rl32(pb);
149  int64_t base = avio_rl64(pb);
150  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
151  ((chunk_id >> 8 & 0xFF) - '0');
152  AVStream *st;
153  AVIStream *ast;
154  int i;
155  int64_t last_pos = -1;
156  int64_t filesize = avi->fsize;
157 
158  av_log(s, AV_LOG_TRACE,
159  "longs_pre_entry:%d index_type:%d entries_in_use:%d "
160  "chunk_id:%X base:%16"PRIX64"\n",
161  longs_pre_entry,
162  index_type,
163  entries_in_use,
164  chunk_id,
165  base);
166 
167  if (stream_id >= s->nb_streams || stream_id < 0)
168  return AVERROR_INVALIDDATA;
169  st = s->streams[stream_id];
170  ast = st->priv_data;
171 
172  if (index_sub_type)
173  return AVERROR_INVALIDDATA;
174 
175  avio_rl32(pb);
176 
177  if (index_type && longs_pre_entry != 2)
178  return AVERROR_INVALIDDATA;
179  if (index_type > 1)
180  return AVERROR_INVALIDDATA;
181 
182  if (filesize > 0 && base >= filesize) {
183  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
184  if (base >> 32 == (base & 0xFFFFFFFF) &&
185  (base & 0xFFFFFFFF) < filesize &&
186  filesize <= 0xFFFFFFFF)
187  base &= 0xFFFFFFFF;
188  else
189  return AVERROR_INVALIDDATA;
190  }
191 
192  for (i = 0; i < entries_in_use; i++) {
193  if (index_type) {
194  int64_t pos = avio_rl32(pb) + base - 8;
195  int len = avio_rl32(pb);
196  int key = len >= 0;
197  len &= 0x7FFFFFFF;
198 
199  av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
200 
201  if (pb->eof_reached)
202  return AVERROR_INVALIDDATA;
203 
204  if (last_pos == pos || pos == base - 8)
205  avi->non_interleaved = 1;
206  if (last_pos != pos && (len || !ast->sample_size))
207  av_add_index_entry(st, pos, ast->cum_len, len, 0,
208  key ? AVINDEX_KEYFRAME : 0);
209 
210  ast->cum_len += get_duration(ast, len);
211  last_pos = pos;
212  } else {
213  int64_t offset, pos;
214  int duration;
215  offset = avio_rl64(pb);
216  avio_rl32(pb); /* size */
217  duration = avio_rl32(pb);
218 
219  if (pb->eof_reached)
220  return AVERROR_INVALIDDATA;
221 
222  pos = avio_tell(pb);
223 
224  if (avi->odml_depth > MAX_ODML_DEPTH) {
225  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
226  return AVERROR_INVALIDDATA;
227  }
228 
229  avio_seek(pb, offset + 8, SEEK_SET);
230  avi->odml_depth++;
231  read_braindead_odml_indx(s, frame_num);
232  avi->odml_depth--;
233  frame_num += duration;
234 
235  avio_seek(pb, pos, SEEK_SET);
236  }
237  }
238  avi->index_loaded = 1;
239  return 0;
240 }
241 
243 {
244  int i;
245  int64_t j;
246 
247  for (i = 0; i < s->nb_streams; i++) {
248  AVStream *st = s->streams[i];
249  AVIStream *ast = st->priv_data;
250  int n = st->nb_index_entries;
251  int max = ast->sample_size;
252  int64_t pos, size, ts;
253 
254  if (n != 1 || ast->sample_size == 0)
255  continue;
256 
257  while (max < 1024)
258  max += max;
259 
260  pos = st->index_entries[0].pos;
261  size = st->index_entries[0].size;
262  ts = st->index_entries[0].timestamp;
263 
264  for (j = 0; j < size; j += max)
265  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
267  }
268 }
269 
270 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
271  uint32_t size)
272 {
273  AVIOContext *pb = s->pb;
274  char key[5] = { 0 };
275  char *value;
276 
277  size += (size & 1);
278 
279  if (size == UINT_MAX)
280  return AVERROR(EINVAL);
281  value = av_malloc(size + 1);
282  if (!value)
283  return AVERROR(ENOMEM);
284  avio_read(pb, value, size);
285  value[size] = 0;
286 
287  AV_WL32(key, tag);
288 
289  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
291 }
292 
293 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
294  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
295 
296 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
297 {
298  char month[4], time[9], buffer[64];
299  int i, day, year;
300  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
301  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
302  month, &day, time, &year) == 4) {
303  for (i = 0; i < 12; i++)
304  if (!av_strcasecmp(month, months[i])) {
305  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
306  year, i + 1, day, time);
307  av_dict_set(metadata, "creation_time", buffer, 0);
308  }
309  } else if (date[4] == '/' && date[7] == '/') {
310  date[4] = date[7] = '-';
311  av_dict_set(metadata, "creation_time", date, 0);
312  }
313 }
314 
315 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
316 {
317  while (avio_tell(s->pb) < end) {
318  uint32_t tag = avio_rl32(s->pb);
319  uint32_t size = avio_rl32(s->pb);
320  switch (tag) {
321  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
322  {
323  uint64_t tag_end = avio_tell(s->pb) + size;
324  while (avio_tell(s->pb) < tag_end) {
325  uint16_t tag = avio_rl16(s->pb);
326  uint16_t size = avio_rl16(s->pb);
327  const char *name = NULL;
328  char buffer[64] = { 0 };
329  size -= avio_read(s->pb, buffer,
330  FFMIN(size, sizeof(buffer) - 1));
331  switch (tag) {
332  case 0x03:
333  name = "maker";
334  break;
335  case 0x04:
336  name = "model";
337  break;
338  case 0x13:
339  name = "creation_time";
340  if (buffer[4] == ':' && buffer[7] == ':')
341  buffer[4] = buffer[7] = '-';
342  break;
343  }
344  if (name)
345  av_dict_set(&s->metadata, name, buffer, 0);
346  avio_skip(s->pb, size);
347  }
348  break;
349  }
350  default:
351  avio_skip(s->pb, size);
352  break;
353  }
354  }
355 }
356 
358 {
359  AVIContext *avi = s->priv_data;
360  AVIOContext *pb = s->pb;
361  unsigned int tag, tag1, handler;
362  int codec_type, stream_index, frame_period;
363  unsigned int size;
364  int i;
365  AVStream *st;
366  AVIStream *ast = NULL;
367  int avih_width = 0, avih_height = 0;
368  int amv_file_format = 0;
369  uint64_t list_end = 0;
370  int64_t pos;
371  int ret;
372 
373  avi->stream_index = -1;
374 
375  ret = get_riff(s, pb);
376  if (ret < 0)
377  return ret;
378 
379  avi->fsize = avio_size(pb);
380  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
381  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
382 
383  /* first list tag */
384  stream_index = -1;
385  codec_type = -1;
386  frame_period = 0;
387  for (;;) {
388  if (pb->eof_reached)
389  goto fail;
390  tag = avio_rl32(pb);
391  size = avio_rl32(pb);
392 
393  print_tag("tag", tag, size);
394 
395  switch (tag) {
396  case MKTAG('L', 'I', 'S', 'T'):
397  list_end = avio_tell(pb) + size;
398  /* Ignored, except at start of video packets. */
399  tag1 = avio_rl32(pb);
400 
401  print_tag("list", tag1, 0);
402 
403  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
404  avi->movi_list = avio_tell(pb) - 4;
405  if (size)
406  avi->movi_end = avi->movi_list + size + (size & 1);
407  else
408  avi->movi_end = avi->fsize;
409  av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
410  goto end_of_header;
411  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
412  ff_read_riff_info(s, size - 4);
413  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
414  avi_read_nikon(s, list_end);
415 
416  break;
417  case MKTAG('I', 'D', 'I', 'T'):
418  {
419  unsigned char date[64] = { 0 };
420  size += (size & 1);
421  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
422  avio_skip(pb, size);
424  break;
425  }
426  case MKTAG('d', 'm', 'l', 'h'):
427  avi->is_odml = 1;
428  avio_skip(pb, size + (size & 1));
429  break;
430  case MKTAG('a', 'm', 'v', 'h'):
431  amv_file_format = 1;
432  case MKTAG('a', 'v', 'i', 'h'):
433  /* AVI header */
434  /* using frame_period is bad idea */
435  frame_period = avio_rl32(pb);
436  avio_skip(pb, 4);
437  avio_rl32(pb);
439 
440  avio_skip(pb, 2 * 4);
441  avio_rl32(pb);
442  avio_rl32(pb);
443  avih_width = avio_rl32(pb);
444  avih_height = avio_rl32(pb);
445 
446  avio_skip(pb, size - 10 * 4);
447  break;
448  case MKTAG('s', 't', 'r', 'h'):
449  /* stream header */
450 
451  tag1 = avio_rl32(pb);
452  handler = avio_rl32(pb); /* codec tag */
453 
454  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
455  avio_skip(pb, size - 8);
456  break;
457  } else {
458  stream_index++;
459  st = avformat_new_stream(s, NULL);
460  if (!st)
461  goto fail;
462 
463  st->id = stream_index;
464  ast = av_mallocz(sizeof(AVIStream));
465  if (!ast)
466  goto fail;
467  st->priv_data = ast;
468  }
469  if (amv_file_format)
470  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
471  : MKTAG('v', 'i', 'd', 's');
472 
473  print_tag("strh", tag1, -1);
474 
475  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
476  tag1 == MKTAG('i', 'v', 'a', 's')) {
477  int64_t dv_dur;
478 
479  /* After some consideration -- I don't think we
480  * have to support anything but DV in type1 AVIs. */
481  if (s->nb_streams != 1)
482  goto fail;
483 
484  if (handler != MKTAG('d', 'v', 's', 'd') &&
485  handler != MKTAG('d', 'v', 'h', 'd') &&
486  handler != MKTAG('d', 'v', 's', 'l'))
487  goto fail;
488 
489  ast = s->streams[0]->priv_data;
491  av_freep(&s->streams[0]->codecpar);
492  av_freep(&s->streams[0]->info);
493  av_freep(&s->streams[0]);
494  s->nb_streams = 0;
495  if (CONFIG_DV_DEMUXER) {
496  avi->dv_demux = avpriv_dv_init_demux(s);
497  if (!avi->dv_demux)
498  goto fail;
499  } else
500  goto fail;
501  s->streams[0]->priv_data = ast;
502  avio_skip(pb, 3 * 4);
503  ast->scale = avio_rl32(pb);
504  ast->rate = avio_rl32(pb);
505  avio_skip(pb, 4); /* start time */
506 
507  dv_dur = avio_rl32(pb);
508  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
509  dv_dur *= AV_TIME_BASE;
510  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
511  }
512  /* else, leave duration alone; timing estimation in utils.c
513  * will make a guess based on bitrate. */
514 
515  stream_index = s->nb_streams - 1;
516  avio_skip(pb, size - 9 * 4);
517  break;
518  }
519 
520  assert(stream_index < s->nb_streams);
521  ast->handler = handler;
522 
523  avio_rl32(pb); /* flags */
524  avio_rl16(pb); /* priority */
525  avio_rl16(pb); /* language */
526  avio_rl32(pb); /* initial frame */
527  ast->scale = avio_rl32(pb);
528  ast->rate = avio_rl32(pb);
529  if (!(ast->scale && ast->rate)) {
531  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
532  "(This file has been generated by broken software.)\n",
533  ast->scale,
534  ast->rate);
535  if (frame_period) {
536  ast->rate = 1000000;
537  ast->scale = frame_period;
538  } else {
539  ast->rate = 25;
540  ast->scale = 1;
541  }
542  }
543  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
544 
545  ast->cum_len = avio_rl32(pb); /* start */
546  st->nb_frames = avio_rl32(pb);
547 
548  st->start_time = 0;
549  avio_rl32(pb); /* buffer size */
550  avio_rl32(pb); /* quality */
551  ast->sample_size = avio_rl32(pb); /* sample size */
552  ast->cum_len *= FFMAX(1, ast->sample_size);
553  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
554  ast->rate, ast->scale, ast->sample_size);
555 
556  switch (tag1) {
557  case MKTAG('v', 'i', 'd', 's'):
558  codec_type = AVMEDIA_TYPE_VIDEO;
559 
560  ast->sample_size = 0;
561  break;
562  case MKTAG('a', 'u', 'd', 's'):
563  codec_type = AVMEDIA_TYPE_AUDIO;
564  break;
565  case MKTAG('t', 'x', 't', 's'):
566  codec_type = AVMEDIA_TYPE_SUBTITLE;
567  break;
568  case MKTAG('d', 'a', 't', 's'):
569  codec_type = AVMEDIA_TYPE_DATA;
570  break;
571  default:
572  av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
573  goto fail;
574  }
575 
576  if (ast->sample_size < 0) {
577  if (s->error_recognition & AV_EF_EXPLODE) {
578  av_log(s, AV_LOG_ERROR,
579  "Invalid sample_size %d at stream %d\n",
580  ast->sample_size,
581  stream_index);
582  goto fail;
583  }
585  "Invalid sample_size %d at stream %d "
586  "setting it to 0\n",
587  ast->sample_size,
588  stream_index);
589  ast->sample_size = 0;
590  }
591 
592  if (ast->sample_size == 0)
593  st->duration = st->nb_frames;
594  ast->frame_offset = ast->cum_len;
595  avio_skip(pb, size - 12 * 4);
596  break;
597  case MKTAG('s', 't', 'r', 'f'):
598  /* stream header */
599  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
600  avio_skip(pb, size);
601  } else {
602  uint64_t cur_pos = avio_tell(pb);
603  if (cur_pos < list_end)
604  size = FFMIN(size, list_end - cur_pos);
605  st = s->streams[stream_index];
606  switch (codec_type) {
607  case AVMEDIA_TYPE_VIDEO:
608  if (amv_file_format) {
609  st->codecpar->width = avih_width;
610  st->codecpar->height = avih_height;
613  avio_skip(pb, size);
614  break;
615  }
616  tag1 = ff_get_bmp_header(pb, st, NULL);
617 
618  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
619  tag1 == MKTAG('D', 'X', 'S', 'A')) {
621  st->codecpar->codec_tag = tag1;
623  break;
624  }
625 
626  if (size > 10 * 4 && size < (1 << 30)) {
627  st->codecpar->extradata_size = size - 10 * 4;
630  if (!st->codecpar->extradata) {
631  st->codecpar->extradata_size = 0;
632  return AVERROR(ENOMEM);
633  }
634  avio_read(pb,
635  st->codecpar->extradata,
636  st->codecpar->extradata_size);
637  }
638 
639  // FIXME: check if the encoder really did this correctly
640  if (st->codecpar->extradata_size & 1)
641  avio_r8(pb);
642 
643  /* Extract palette from extradata if bpp <= 8.
644  * This code assumes that extradata contains only palette.
645  * This is true for all paletted codecs implemented in
646  * Libav. */
647  if (st->codecpar->extradata_size &&
648  (st->codecpar->bits_per_coded_sample <= 8)) {
649  int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
650  const uint8_t *pal_src;
651 
652  pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
653  pal_src = st->codecpar->extradata +
654  st->codecpar->extradata_size - pal_size;
655 #if HAVE_BIGENDIAN
656  for (i = 0; i < pal_size / 4; i++)
657  ast->pal[i] = av_bswap32(((uint32_t *)pal_src)[i]);
658 #else
659  memcpy(ast->pal, pal_src, pal_size);
660 #endif
661  ast->has_pal = 1;
662  }
663 
664  print_tag("video", tag1, 0);
665 
667  st->codecpar->codec_tag = tag1;
669  tag1);
670  /* If codec is not found yet, try with the mov tags. */
671  if (!st->codecpar->codec_id) {
672  char tag_buf[32];
673  av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1);
674  st->codecpar->codec_id =
676  if (st->codecpar->codec_id)
678  "mov tag found in avi (fourcc %s)\n",
679  tag_buf);
680  }
681  /* This is needed to get the pict type which is necessary
682  * for generating correct pts. */
684 
685  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
686  ast->handler == MKTAG('X', 'V', 'I', 'D'))
687  st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
688 
689  // Support "Resolution 1:1" for Avid AVI Codec
690  if (tag1 == MKTAG('A', 'V', 'R', 'n') &&
691  st->codecpar->extradata_size >= 31 &&
692  !memcmp(&st->codecpar->extradata[28], "1:1", 3))
694 
695  if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
696  st->codecpar->extradata_size < 1U << 30) {
697  st->codecpar->extradata_size += 9;
698  if ((ret = av_reallocp(&st->codecpar->extradata,
699  st->codecpar->extradata_size +
701  st->codecpar->extradata_size = 0;
702  return ret;
703  } else
704  memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
705  "BottomUp", 9);
706  }
707  st->codecpar->height = FFABS(st->codecpar->height);
708 
709 // avio_skip(pb, size - 5 * 4);
710  break;
711  case AVMEDIA_TYPE_AUDIO:
712  ret = ff_get_wav_header(s, pb, st->codecpar, size);
713  if (ret < 0)
714  return ret;
716  if (ast->sample_size && st->codecpar->block_align &&
717  ast->sample_size != st->codecpar->block_align) {
718  av_log(s,
720  "sample size (%d) != block align (%d)\n",
721  ast->sample_size,
722  st->codecpar->block_align);
723  ast->sample_size = st->codecpar->block_align;
724  }
725  /* 2-aligned
726  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
727  if (size & 1)
728  avio_skip(pb, 1);
729  /* Force parsing as several audio frames can be in
730  * one packet and timestamps refer to packet start. */
732  /* ADTS header is in extradata, AAC without header must be
733  * stored as exact frames. Parser not needed and it will
734  * fail. */
735  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
738  /* AVI files with Xan DPCM audio (wrongly) declare PCM
739  * audio in the header but have Axan as stream_code_tag. */
740  if (ast->handler == AV_RL32("Axan")) {
742  st->codecpar->codec_tag = 0;
743  }
744  if (amv_file_format) {
746  ast->dshow_block_align = 0;
747  }
748  break;
752  break;
753  default:
756  st->codecpar->codec_tag = 0;
757  avio_skip(pb, size);
758  break;
759  }
760  }
761  break;
762  case MKTAG('i', 'n', 'd', 'x'):
763  pos = avio_tell(pb);
764  if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
765  read_braindead_odml_indx(s, 0) < 0 &&
767  goto fail;
768  avio_seek(pb, pos + size, SEEK_SET);
769  break;
770  case MKTAG('v', 'p', 'r', 'p'):
771  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
772  AVRational active, active_aspect;
773 
774  st = s->streams[stream_index];
775  avio_rl32(pb);
776  avio_rl32(pb);
777  avio_rl32(pb);
778  avio_rl32(pb);
779  avio_rl32(pb);
780 
781  active_aspect.den = avio_rl16(pb);
782  active_aspect.num = avio_rl16(pb);
783  active.num = avio_rl32(pb);
784  active.den = avio_rl32(pb);
785  avio_rl32(pb); // nbFieldsPerFrame
786 
787  if (active_aspect.num && active_aspect.den &&
788  active.num && active.den) {
789  st->sample_aspect_ratio = av_div_q(active_aspect, active);
790  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
791  active_aspect.num, active_aspect.den,
792  active.num, active.den);
793  }
794  size -= 9 * 4;
795  }
796  avio_skip(pb, size);
797  break;
798  case MKTAG('s', 't', 'r', 'n'):
799  if (s->nb_streams) {
800  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
801  if (ret < 0)
802  return ret;
803  break;
804  }
805  default:
806  if (size > 1000000) {
807  av_log(s, AV_LOG_ERROR,
808  "Something went wrong during header parsing, "
809  "I will ignore it and try to continue anyway.\n");
811  goto fail;
812  avi->movi_list = avio_tell(pb) - 4;
813  avi->movi_end = avi->fsize;
814  goto end_of_header;
815  }
816  /* skip tag */
817  size += (size & 1);
818  avio_skip(pb, size);
819  break;
820  }
821  }
822 
823 end_of_header:
824  /* check stream number */
825  if (stream_index != s->nb_streams - 1) {
826 
827 fail:
828  return AVERROR_INVALIDDATA;
829  }
830 
831  if (!avi->index_loaded && pb->seekable)
832  avi_load_index(s);
833  avi->index_loaded = 1;
834 
835  if ((ret = guess_ni_flag(s)) < 0)
836  return ret;
837 
838  avi->non_interleaved |= ret;
839  for (i = 0; i < s->nb_streams; i++) {
840  AVStream *st = s->streams[i];
841  if (st->nb_index_entries)
842  break;
843  }
844  if (i == s->nb_streams && avi->non_interleaved) {
846  "Non-interleaved AVI without index, switching to interleaved\n");
847  avi->non_interleaved = 0;
848  }
849 
850  if (avi->non_interleaved) {
851  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
852  clean_index(s);
853  }
854 
855  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
857 
858  return 0;
859 }
860 
861 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
862 {
863  if (pkt->size >= 7 &&
864  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
865  uint8_t desc[256];
866  int score = AVPROBE_SCORE_EXTENSION, ret;
867  AVIStream *ast = st->priv_data;
868  AVInputFormat *sub_demuxer;
869  AVRational time_base;
870  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
871  pkt->size - 7,
872  0, NULL, NULL, NULL, NULL);
873  AVProbeData pd;
874  unsigned int desc_len = avio_rl32(pb);
875 
876  if (desc_len > pb->buf_end - pb->buf_ptr)
877  goto error;
878 
879  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
880  avio_skip(pb, desc_len - ret);
881  if (*desc)
882  av_dict_set(&st->metadata, "title", desc, 0);
883 
884  avio_rl16(pb); /* flags? */
885  avio_rl32(pb); /* data size */
886 
887  pd = (AVProbeData) { .buf = pb->buf_ptr,
888  .buf_size = pb->buf_end - pb->buf_ptr };
889  if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
890  goto error;
891 
892  if (!(ast->sub_ctx = avformat_alloc_context()))
893  goto error;
894 
895  ast->sub_ctx->pb = pb;
896  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
897  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
899  time_base = ast->sub_ctx->streams[0]->time_base;
900  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
901  }
902  ast->sub_buffer = pkt->data;
903  memset(pkt, 0, sizeof(*pkt));
904  return 1;
905 
906 error:
907  av_freep(&pb);
908  }
909  return 0;
910 }
911 
913  AVPacket *pkt)
914 {
915  AVIStream *ast, *next_ast = next_st->priv_data;
916  int64_t ts, next_ts, ts_min = INT64_MAX;
917  AVStream *st, *sub_st = NULL;
918  int i;
919 
920  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
922 
923  for (i = 0; i < s->nb_streams; i++) {
924  st = s->streams[i];
925  ast = st->priv_data;
926  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
928  if (ts <= next_ts && ts < ts_min) {
929  ts_min = ts;
930  sub_st = st;
931  }
932  }
933  }
934 
935  if (sub_st) {
936  ast = sub_st->priv_data;
937  *pkt = ast->sub_pkt;
938  pkt->stream_index = sub_st->index;
939 
940  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
941  ast->sub_pkt.data = NULL;
942  }
943  return sub_st;
944 }
945 
946 static int get_stream_idx(int *d)
947 {
948  if (d[0] >= '0' && d[0] <= '9' &&
949  d[1] >= '0' && d[1] <= '9') {
950  return (d[0] - '0') * 10 + (d[1] - '0');
951  } else {
952  return 100; // invalid stream ID
953  }
954 }
955 
956 static int avi_sync(AVFormatContext *s, int exit_early)
957 {
958  AVIContext *avi = s->priv_data;
959  AVIOContext *pb = s->pb;
960  int n;
961  unsigned int d[8];
962  unsigned int size;
963  int64_t i, sync;
964 
965 start_sync:
966  memset(d, -1, sizeof(d));
967  for (i = sync = avio_tell(pb); !pb->eof_reached; i++) {
968  int j;
969 
970  for (j = 0; j < 7; j++)
971  d[j] = d[j + 1];
972  d[7] = avio_r8(pb);
973 
974  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
975 
976  n = get_stream_idx(d + 2);
977  av_log(s, AV_LOG_TRACE, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
978  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
979  if (i + (uint64_t)size > avi->fsize || d[0] > 127)
980  continue;
981 
982  // parse ix##
983  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
984  // parse JUNK
985  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
986  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
987  avio_skip(pb, size);
988  goto start_sync;
989  }
990 
991  // parse stray LIST
992  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
993  avio_skip(pb, 4);
994  goto start_sync;
995  }
996 
997  n = get_stream_idx(d);
998 
999  if (!((i - avi->last_pkt_pos) & 1) &&
1000  get_stream_idx(d + 1) < s->nb_streams)
1001  continue;
1002 
1003  // detect ##ix chunk and skip
1004  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1005  avio_skip(pb, size);
1006  goto start_sync;
1007  }
1008 
1009  if (avi->dv_demux && n != 0)
1010  continue;
1011 
1012  // parse ##dc/##wb
1013  if (n < s->nb_streams) {
1014  AVStream *st;
1015  AVIStream *ast;
1016  st = s->streams[n];
1017  ast = st->priv_data;
1018 
1019  if (s->nb_streams >= 2) {
1020  AVStream *st1 = s->streams[1];
1021  AVIStream *ast1 = st1->priv_data;
1022  // workaround for broken small-file-bug402.avi
1023  if (d[2] == 'w' && d[3] == 'b' && n == 0 &&
1026  ast->prefix == 'd' * 256 + 'c' &&
1027  (d[2] * 256 + d[3] == ast1->prefix ||
1028  !ast1->prefix_count)) {
1029  n = 1;
1030  st = st1;
1031  ast = ast1;
1033  "Invalid stream + prefix combination, assuming audio.\n");
1034  }
1035  }
1036 
1037  if (!avi->dv_demux &&
1038  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1039  // FIXME: needs a little reordering
1040  (st->discard >= AVDISCARD_NONKEY &&
1041  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1042  || st->discard >= AVDISCARD_ALL)) {
1043  if (!exit_early) {
1044  ast->frame_offset += get_duration(ast, size);
1045  }
1046  avio_skip(pb, size);
1047  goto start_sync;
1048  }
1049 
1050  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1051  int k = avio_r8(pb);
1052  int last = (k + avio_r8(pb) - 1) & 0xFF;
1053 
1054  avio_rl16(pb); // flags
1055 
1056  // b + (g << 8) + (r << 16);
1057  for (; k <= last; k++)
1058  ast->pal[k] = avio_rb32(pb) >> 8;
1059 
1060  ast->has_pal = 1;
1061  goto start_sync;
1062  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1063  d[2] < 128 && d[3] < 128) ||
1064  d[2] * 256 + d[3] == ast->prefix /* ||
1065  (d[2] == 'd' && d[3] == 'c') ||
1066  (d[2] == 'w' && d[3] == 'b') */) {
1067  if (exit_early)
1068  return 0;
1069  if (d[2] * 256 + d[3] == ast->prefix)
1070  ast->prefix_count++;
1071  else {
1072  ast->prefix = d[2] * 256 + d[3];
1073  ast->prefix_count = 0;
1074  }
1075 
1076  avi->stream_index = n;
1077  ast->packet_size = size + 8;
1078  ast->remaining = size;
1079 
1080  if (size || !ast->sample_size) {
1081  uint64_t pos = avio_tell(pb) - 8;
1082  if (!st->index_entries || !st->nb_index_entries ||
1083  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1084  av_add_index_entry(st, pos, ast->frame_offset, size,
1085  0, AVINDEX_KEYFRAME);
1086  }
1087  }
1088  return 0;
1089  }
1090  }
1091  }
1092 
1093  return AVERROR_EOF;
1094 }
1095 
1097 {
1098  AVIContext *avi = s->priv_data;
1099  int best_stream_index = 0;
1100  AVStream *best_st = NULL;
1101  AVIStream *best_ast;
1102  int64_t best_ts = INT64_MAX;
1103  int i;
1104 
1105  for (i = 0; i < s->nb_streams; i++) {
1106  AVStream *st = s->streams[i];
1107  AVIStream *ast = st->priv_data;
1108  int64_t ts = ast->frame_offset;
1109  int64_t last_ts;
1110 
1111  if (!st->nb_index_entries)
1112  continue;
1113 
1114  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1115  if (!ast->remaining && ts > last_ts)
1116  continue;
1117 
1118  ts = av_rescale_q(ts, st->time_base,
1119  (AVRational) { FFMAX(1, ast->sample_size),
1120  AV_TIME_BASE });
1121 
1122  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1123  st->time_base.num, st->time_base.den, ast->frame_offset);
1124  if (ts < best_ts) {
1125  best_ts = ts;
1126  best_st = st;
1127  best_stream_index = i;
1128  }
1129  }
1130  if (!best_st)
1131  return AVERROR_EOF;
1132 
1133  best_ast = best_st->priv_data;
1134  best_ts = av_rescale_q(best_ts,
1135  (AVRational) { FFMAX(1, best_ast->sample_size),
1136  AV_TIME_BASE },
1137  best_st->time_base);
1138  if (best_ast->remaining) {
1139  i = av_index_search_timestamp(best_st,
1140  best_ts,
1141  AVSEEK_FLAG_ANY |
1143  } else {
1144  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1145  if (i >= 0)
1146  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1147  }
1148 
1149  if (i >= 0) {
1150  int64_t pos = best_st->index_entries[i].pos;
1151  pos += best_ast->packet_size - best_ast->remaining;
1152  avio_seek(s->pb, pos + 8, SEEK_SET);
1153 
1154  assert(best_ast->remaining <= best_ast->packet_size);
1155 
1156  avi->stream_index = best_stream_index;
1157  if (!best_ast->remaining)
1158  best_ast->packet_size =
1159  best_ast->remaining = best_st->index_entries[i].size;
1160  }
1161 
1162  return 0;
1163 }
1164 
1166 {
1167  AVIContext *avi = s->priv_data;
1168  AVIOContext *pb = s->pb;
1169  int err;
1170 
1171  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1172  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1173  if (size >= 0)
1174  return size;
1175  else
1176  goto resync;
1177  }
1178 
1179  if (avi->non_interleaved) {
1180  err = ni_prepare_read(s);
1181  if (err < 0)
1182  return err;
1183  }
1184 
1185 resync:
1186  if (avi->stream_index >= 0) {
1187  AVStream *st = s->streams[avi->stream_index];
1188  AVIStream *ast = st->priv_data;
1189  int size, err;
1190 
1191  if (get_subtitle_pkt(s, st, pkt))
1192  return 0;
1193 
1194  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1195  if (ast->sample_size <= 1)
1196  size = INT_MAX;
1197  else if (ast->sample_size < 32)
1198  // arbitrary multiplier to avoid tiny packets for raw PCM data
1199  size = 1024 * ast->sample_size;
1200  else
1201  size = ast->sample_size;
1202 
1203  if (size > ast->remaining)
1204  size = ast->remaining;
1205  avi->last_pkt_pos = avio_tell(pb);
1206  err = av_get_packet(pb, pkt, size);
1207  if (err < 0)
1208  return err;
1209 
1210  if (ast->has_pal && pkt->data && pkt->size < (unsigned)INT_MAX / 2) {
1211  uint8_t *pal;
1212  pal = av_packet_new_side_data(pkt,
1214  AVPALETTE_SIZE);
1215  if (!pal) {
1216  av_log(s, AV_LOG_ERROR,
1217  "Failed to allocate data for palette\n");
1218  } else {
1219  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1220  ast->has_pal = 0;
1221  }
1222  }
1223 
1224  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1225  AVBufferRef *avbuf = pkt->buf;
1226  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1227  pkt->data, pkt->size);
1228  pkt->buf = avbuf;
1229  pkt->flags |= AV_PKT_FLAG_KEY;
1230  if (size < 0)
1231  av_packet_unref(pkt);
1232  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1233  !st->codecpar->codec_tag && read_gab2_sub(st, pkt)) {
1234  ast->frame_offset++;
1235  avi->stream_index = -1;
1236  ast->remaining = 0;
1237  goto resync;
1238  } else {
1239  /* XXX: How to handle B-frames in AVI? */
1240  pkt->dts = ast->frame_offset;
1241 // pkt->dts += ast->start;
1242  if (ast->sample_size)
1243  pkt->dts /= ast->sample_size;
1244  av_log(s, AV_LOG_TRACE,
1245  "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1246  "base:%d st:%d size:%d\n",
1247  pkt->dts,
1248  ast->frame_offset,
1249  ast->scale,
1250  ast->rate,
1251  ast->sample_size,
1252  AV_TIME_BASE,
1253  avi->stream_index,
1254  size);
1255  pkt->stream_index = avi->stream_index;
1256 
1257  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1258  AVIndexEntry *e;
1259  int index;
1260  assert(st->index_entries);
1261 
1262  index = av_index_search_timestamp(st, ast->frame_offset, 0);
1263  e = &st->index_entries[index];
1264 
1265  if (index >= 0 && e->timestamp == ast->frame_offset)
1266  if (e->flags & AVINDEX_KEYFRAME)
1267  pkt->flags |= AV_PKT_FLAG_KEY;
1268  } else {
1269  pkt->flags |= AV_PKT_FLAG_KEY;
1270  }
1271  ast->frame_offset += get_duration(ast, pkt->size);
1272  }
1273  ast->remaining -= err;
1274  if (!ast->remaining) {
1275  avi->stream_index = -1;
1276  ast->packet_size = 0;
1277  }
1278 
1279  return 0;
1280  }
1281 
1282  if ((err = avi_sync(s, 0)) < 0)
1283  return err;
1284  goto resync;
1285 }
1286 
1287 /* XXX: We make the implicit supposition that the positions are sorted
1288  * for each stream. */
1290 {
1291  AVIContext *avi = s->priv_data;
1292  AVIOContext *pb = s->pb;
1293  int nb_index_entries, i;
1294  AVStream *st;
1295  AVIStream *ast;
1296  unsigned int index, tag, flags, pos, len, first_packet = 1;
1297  unsigned last_pos = -1;
1298  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1299 
1300  nb_index_entries = size / 16;
1301  if (nb_index_entries <= 0)
1302  return AVERROR_INVALIDDATA;
1303 
1304  idx1_pos = avio_tell(pb);
1305  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1306  if (avi_sync(s, 1) == 0)
1307  first_packet_pos = avio_tell(pb) - 8;
1308  avi->stream_index = -1;
1309  avio_seek(pb, idx1_pos, SEEK_SET);
1310 
1311  /* Read the entries and sort them in each stream component. */
1312  for (i = 0; i < nb_index_entries; i++) {
1313  tag = avio_rl32(pb);
1314  flags = avio_rl32(pb);
1315  pos = avio_rl32(pb);
1316  len = avio_rl32(pb);
1317  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1318  i, tag, flags, pos, len);
1319 
1320  index = ((tag & 0xff) - '0') * 10;
1321  index += (tag >> 8 & 0xff) - '0';
1322  if (index >= s->nb_streams)
1323  continue;
1324  st = s->streams[index];
1325  ast = st->priv_data;
1326 
1327  if (first_packet && first_packet_pos && len) {
1328  data_offset = first_packet_pos - pos;
1329  first_packet = 0;
1330  }
1331  pos += data_offset;
1332 
1333  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1334 
1335  if (pb->eof_reached)
1336  return AVERROR_INVALIDDATA;
1337 
1338  if (last_pos == pos)
1339  avi->non_interleaved = 1;
1340  else if (len || !ast->sample_size)
1341  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1342  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1343  ast->cum_len += get_duration(ast, len);
1344  last_pos = pos;
1345  }
1346  return 0;
1347 }
1348 
1349 /* Scan the index and consider any file with streams more than
1350  * 2 seconds or 64MB apart non-interleaved. */
1352 {
1353  int64_t min_pos, pos;
1354  int i;
1355  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1356  if (!idx)
1357  return AVERROR(ENOMEM);
1358 
1359  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1360  int64_t max_dts = INT64_MIN / 2;
1361  int64_t min_dts = INT64_MAX / 2;
1362  int64_t max_buffer = 0;
1363 
1364  min_pos = INT64_MAX;
1365 
1366  for (i = 0; i < s->nb_streams; i++) {
1367  AVStream *st = s->streams[i];
1368  AVIStream *ast = st->priv_data;
1369  int n = st->nb_index_entries;
1370  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1371  idx[i]++;
1372  if (idx[i] < n) {
1373  int64_t dts;
1374  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1375  FFMAX(ast->sample_size, 1),
1376  st->time_base, AV_TIME_BASE_Q);
1377  min_dts = FFMIN(min_dts, dts);
1378  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1379  }
1380  }
1381  for (i = 0; i < s->nb_streams; i++) {
1382  AVStream *st = s->streams[i];
1383  AVIStream *ast = st->priv_data;
1384 
1385  if (idx[i] && min_dts != INT64_MAX / 2) {
1386  int64_t dts;
1387  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1388  FFMAX(ast->sample_size, 1),
1389  st->time_base, AV_TIME_BASE_Q);
1390  max_dts = FFMAX(max_dts, dts);
1391  max_buffer = FFMAX(max_buffer,
1392  av_rescale(dts - min_dts,
1393  st->codecpar->bit_rate,
1394  AV_TIME_BASE));
1395  }
1396  }
1397  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1398  max_buffer > 1024 * 1024 * 8 * 8) {
1399  av_free(idx);
1400  return 1;
1401  }
1402  }
1403  av_free(idx);
1404  return 0;
1405 }
1406 
1408 {
1409  int i;
1410  int64_t last_start = 0;
1411  int64_t first_end = INT64_MAX;
1412  int64_t oldpos = avio_tell(s->pb);
1413 
1414  for (i = 0; i < s->nb_streams; i++) {
1415  AVStream *st = s->streams[i];
1416  int n = st->nb_index_entries;
1417  unsigned int size;
1418 
1419  if (n <= 0)
1420  continue;
1421 
1422  if (n >= 2) {
1423  int64_t pos = st->index_entries[0].pos;
1424  avio_seek(s->pb, pos + 4, SEEK_SET);
1425  size = avio_rl32(s->pb);
1426  if (pos + size > st->index_entries[1].pos)
1427  last_start = INT64_MAX;
1428  }
1429 
1430  if (st->index_entries[0].pos > last_start)
1431  last_start = st->index_entries[0].pos;
1432  if (st->index_entries[n - 1].pos < first_end)
1433  first_end = st->index_entries[n - 1].pos;
1434  }
1435  avio_seek(s->pb, oldpos, SEEK_SET);
1436 
1437  if (last_start > first_end)
1438  return 1;
1439 
1440  return check_stream_max_drift(s);
1441 }
1442 
1444 {
1445  AVIContext *avi = s->priv_data;
1446  AVIOContext *pb = s->pb;
1447  uint32_t tag, size;
1448  int64_t pos = avio_tell(pb);
1449  int ret = -1;
1450 
1451  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1452  goto the_end; // maybe truncated file
1453  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1454  for (;;) {
1455  if (pb->eof_reached)
1456  break;
1457  tag = avio_rl32(pb);
1458  size = avio_rl32(pb);
1459  av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n",
1460  tag & 0xff,
1461  (tag >> 8) & 0xff,
1462  (tag >> 16) & 0xff,
1463  (tag >> 24) & 0xff,
1464  size);
1465 
1466  if (tag == MKTAG('i', 'd', 'x', '1') &&
1467  avi_read_idx1(s, size) >= 0) {
1468  ret = 0;
1469  break;
1470  }
1471 
1472  size += (size & 1);
1473  if (avio_skip(pb, size) < 0)
1474  break; // something is wrong here
1475  }
1476 
1477 the_end:
1478  avio_seek(pb, pos, SEEK_SET);
1479  return ret;
1480 }
1481 
1482 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1483 {
1484  AVIStream *ast2 = st2->priv_data;
1485  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1486  av_packet_unref(&ast2->sub_pkt);
1487  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1488  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1489  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1490 }
1491 
1492 static int avi_read_seek(AVFormatContext *s, int stream_index,
1493  int64_t timestamp, int flags)
1494 {
1495  AVIContext *avi = s->priv_data;
1496  AVStream *st;
1497  int i, index;
1498  int64_t pos;
1499  AVIStream *ast;
1500 
1501  /* Does not matter which stream is requested dv in avi has the
1502  * stream information in the first video stream.
1503  */
1504  if (avi->dv_demux)
1505  stream_index = 0;
1506 
1507  if (!avi->index_loaded) {
1508  /* we only load the index on demand */
1509  avi_load_index(s);
1510  avi->index_loaded = 1;
1511  }
1512 
1513  st = s->streams[stream_index];
1514  ast = st->priv_data;
1515  index = av_index_search_timestamp(st,
1516  timestamp * FFMAX(ast->sample_size, 1),
1517  flags);
1518  if (index < 0)
1519  return AVERROR_INVALIDDATA;
1520 
1521  /* find the position */
1522  pos = st->index_entries[index].pos;
1523  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1524 
1525  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1526  timestamp, index, st->index_entries[index].timestamp);
1527 
1528  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1529  /* One and only one real stream for DV in AVI, and it has video */
1530  /* offsets. Calling with other stream indexes should have failed */
1531  /* the av_index_search_timestamp call above. */
1532 
1533  /* Feed the DV video stream version of the timestamp to the */
1534  /* DV demux so it can synthesize correct timestamps. */
1535  ff_dv_offset_reset(avi->dv_demux, timestamp);
1536 
1537  avio_seek(s->pb, pos, SEEK_SET);
1538  avi->stream_index = -1;
1539  return 0;
1540  }
1541 
1542  for (i = 0; i < s->nb_streams; i++) {
1543  AVStream *st2 = s->streams[i];
1544  AVIStream *ast2 = st2->priv_data;
1545 
1546  ast2->packet_size =
1547  ast2->remaining = 0;
1548 
1549  if (ast2->sub_ctx) {
1550  seek_subtitle(st, st2, timestamp);
1551  continue;
1552  }
1553 
1554  if (st2->nb_index_entries <= 0)
1555  continue;
1556 
1557 // assert(st2->codecpar->block_align);
1558  assert((int64_t)st2->time_base.num * ast2->rate ==
1559  (int64_t)st2->time_base.den * ast2->scale);
1560  index = av_index_search_timestamp(st2,
1561  av_rescale_q(timestamp,
1562  st->time_base,
1563  st2->time_base) *
1564  FFMAX(ast2->sample_size, 1),
1565  flags | AVSEEK_FLAG_BACKWARD);
1566  if (index < 0)
1567  index = 0;
1568 
1569  if (!avi->non_interleaved) {
1570  while (index > 0 && st2->index_entries[index].pos > pos)
1571  index--;
1572  while (index + 1 < st2->nb_index_entries &&
1573  st2->index_entries[index].pos < pos)
1574  index++;
1575  }
1576 
1577  av_log(s, AV_LOG_TRACE, "%"PRId64" %d %"PRId64"\n",
1578  timestamp, index, st2->index_entries[index].timestamp);
1579  /* extract the current frame number */
1580  ast2->frame_offset = st2->index_entries[index].timestamp;
1581  }
1582 
1583  /* do the seek */
1584  avio_seek(s->pb, pos, SEEK_SET);
1585  avi->stream_index = -1;
1586  return 0;
1587 }
1588 
1590 {
1591  int i;
1592  AVIContext *avi = s->priv_data;
1593 
1594  for (i = 0; i < s->nb_streams; i++) {
1595  AVStream *st = s->streams[i];
1596  AVIStream *ast = st->priv_data;
1597  if (ast) {
1598  if (ast->sub_ctx) {
1599  av_freep(&ast->sub_ctx->pb);
1601  }
1602  av_free(ast->sub_buffer);
1603  av_packet_unref(&ast->sub_pkt);
1604  }
1605  }
1606 
1607  av_free(avi->dv_demux);
1608 
1609  return 0;
1610 }
1611 
1612 static int avi_probe(AVProbeData *p)
1613 {
1614  int i;
1615 
1616  /* check file header */
1617  for (i = 0; avi_headers[i][0]; i++)
1618  if (!memcmp(p->buf, avi_headers[i], 4) &&
1619  !memcmp(p->buf + 8, avi_headers[i] + 4, 4))
1620  return AVPROBE_SCORE_MAX;
1621 
1622  return 0;
1623 }
1624 
1626  .name = "avi",
1627  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1628  .priv_data_size = sizeof(AVIContext),
1629  .extensions = "avi",
1630  .read_probe = avi_probe,
1635 };
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:202
#define AVPALETTE_SIZE
Definition: avcodec.h:3402
codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it ...
Definition: avcodec.h:565
static AVStream * get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt)
Definition: avidec.c:912
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:1657
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:659
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
uint32_t handler
Definition: avidec.c:46
Bytestream IO Context.
Definition: avio.h:104
#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
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:297
uint32_t pal[256]
Definition: avidec.c:55
int size
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:1214
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:1983
Definition: vf_drawbox.c:37
AVFormatContext * sub_ctx
Definition: avidec.c:60
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:130
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:120
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:121
#define MAX_ODML_DEPTH
Definition: avidec.c:77
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:284
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:2986
const char * desc
Definition: nvenc.c:101
int64_t pos
Definition: avformat.h:664
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:1659
int64_t last_pkt_pos
Definition: avidec.c:70
uint32_t rate
Definition: avidec.c:48
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3483
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:770
int dshow_block_align
Definition: avidec.c:57
int num
numerator
Definition: rational.h:44
int index
stream index in AVFormatContext
Definition: avformat.h:706
int size
Definition: avcodec.h:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, 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)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:242
static int sync(AVFormatContext *s, uint8_t *header)
Read input until we find the next ident.
Definition: lxfdec.c:86
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:890
int is_odml
Definition: avidec.c:72
enum AVMediaType codec_type
Definition: rtp.c:36
int64_t movi_end
Definition: avidec.c:67
uint32_t scale
Definition: avidec.c:47
#define AV_RL16
Definition: intreadwrite.h:42
static int get_duration(AVIStream *ast, int len)
Definition: avidec.c:105
void * priv_data
Definition: avformat.h:720
#define AVIIF_INDEX
Definition: avi.h:36
struct AVStream::@125 * info
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
Definition: utils.c:2071
discard all
Definition: avcodec.h:689
static int ni_prepare_read(AVFormatContext *s)
Definition: avidec.c:1096
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.
static int check_stream_max_drift(AVFormatContext *s)
Definition: avidec.c:1351
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:89
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:202
Format I/O context.
Definition: avformat.h:940
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1053
Public dictionary API.
int stream_index
Definition: avidec.c:74
static char buffer[20]
Definition: seek.c:32
uint8_t
Opaque data information usually continuous.
Definition: avutil.h:196
int width
Video only.
Definition: avcodec.h:3525
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1589
int64_t riff_end
Definition: avidec.c:66
const AVCodecTag ff_codec_movvideo_tags[]
Definition: isom.c:70
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:150
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:696
enum AVStreamParseType need_parsing
Definition: avformat.h:879
int id
Format-specific stream ID.
Definition: avformat.h:712
int64_t movi_list
Definition: avidec.c:69
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2648
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1008
int64_t duration
Definition: movenc.c:63
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:136
static void clean_index(AVFormatContext *s)
Definition: avidec.c:242
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1051
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:302
uint8_t * data
Definition: avcodec.h:1346
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:50
uint32_t tag
Definition: movenc.c:854
#define AVERROR_EOF
End of file.
Definition: error.h:51
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
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
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:295
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, uint8_t *buf, int buf_size)
Definition: dv.c:342
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:545
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1378
int packet_size
Definition: avidec.c:44
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:99
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AVINDEX_KEYFRAME
Definition: avformat.h:666
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:151
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2819
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1148
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:190
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1255
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:665
#define AVERROR(e)
Definition: error.h:43
int remaining
Definition: avidec.c:43
int64_t timestamp
Definition: avformat.h:665
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:87
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
Definition: avidec.c:140
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3479
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1329
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
Definition: avidec.c:270
#define FFMAX(a, b)
Definition: common.h:64
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:171
#define fail()
Definition: checkasm.h:80
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1352
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3501
Only parse headers, do not repack.
Definition: avformat.h:658
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:536
int bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3512
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:400
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:996
int prefix_count
Definition: avidec.c:54
int non_interleaved
Definition: avidec.c:73
int block_align
Audio only.
Definition: avcodec.h:3571
const char * name
Definition: qsvenc.c:44
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:153
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:86
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:241
#define FFMIN(a, b)
Definition: common.h:66
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
Definition: dv.c:413
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&#39;s been allocated with av_malloc() and children.
Definition: dict.h:64
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int64_t cum_len
Definition: avidec.c:52
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:357
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:286
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static const char months[12][4]
Definition: avidec.c:293
#define FFABS(a)
Definition: common.h:61
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
Definition: avidec.c:1482
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_EF_EXPLODE
Definition: avcodec.h:2681
AVDictionary * metadata
Definition: avformat.h:772
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:416
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:546
Stream structure.
Definition: avformat.h:705
static const char avi_headers[][8]
Definition: avidec.c:80
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avidec.c:1165
int prefix
Definition: avidec.c:53
static int read_gab2_sub(AVStream *st, AVPacket *pkt)
Definition: avidec.c:861
NULL
Definition: eval.c:55
#define AV_LOG_INFO
Standard information.
Definition: log.h:135
#define av_bswap32
Definition: bswap.h:33
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:247
AVIOContext * pb
I/O context.
Definition: avformat.h:982
int index_loaded
Definition: avidec.c:71
static int get_stream_idx(int *d)
Definition: avidec.c:946
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:347
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
int nb_index_entries
Definition: avformat.h:892
static int avi_read_idx1(AVFormatContext *s, int size)
Definition: avidec.c:1289
int index
Definition: gxfenc.c:72
rational number numerator/denominator
Definition: rational.h:43
byte swapping routines
discard useless packets like 0 size packets in avi
Definition: avcodec.h:685
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:405
static int avi_probe(AVProbeData *p)
Definition: avidec.c:1612
This structure contains the data a format has to probe a file.
Definition: avformat.h:398
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:1575
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:442
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1443
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1625
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:757
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:407
A reference to a data buffer.
Definition: buffer.h:81
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:649
Main libavformat public API header.
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
Definition: avidec.c:315
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
Definition: avidec.c:296
AVPacket sub_pkt
Definition: avidec.c:61
int64_t start_time
Decoding: pts of the first frame of the stream, in stream time base.
Definition: avformat.h:750
#define CONFIG_DV_DEMUXER
Definition: config.h:908
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1170
static int get_riff(AVFormatContext *s, AVIOContext *pb)
Definition: avidec.c:115
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:759
int den
denominator
Definition: rational.h:45
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
Definition: dv.c:325
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
Read BITMAPINFOHEADER structure and set AVStream codec width, height and bits_per_encoded_sample fiel...
Definition: riffdec.c:183
int sample_size
Definition: avidec.c:49
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:2626
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:638
int eof_reached
true if eof reached
Definition: avio.h:132
int len
int has_pal
Definition: avidec.c:56
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1407
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size)
Definition: riffdec.c:82
void * priv_data
Format private data.
Definition: avformat.h:968
#define print_tag(str, tag, size)
Definition: avidec.c:97
int64_t frame_offset
Definition: avidec.c:41
int64_t fsize
Definition: avidec.c:68
int bits_per_coded_sample
Definition: avcodec.h:3514
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3497
#define AV_WL32(p, val)
Definition: intreadwrite.h:263
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1345
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:1492
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1035
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:529
AVCodecParameters * codecpar
Definition: avformat.h:831
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3487
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:263
int stream_index
Definition: avcodec.h:1348
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:742
#define MKTAG(a, b, c, d)
Definition: common.h:256
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:763
int odml_depth
Definition: avidec.c:76
This structure stores compressed data.
Definition: avcodec.h:1323
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:673
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:956
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:211
uint8_t * sub_buffer
Definition: avidec.c:62
DVDemuxContext * dv_demux
Definition: avidec.c:75