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avidec.c
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1 /*
2  * AVI demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <inttypes.h>
23 
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bswap.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/mathematics.h"
32 #include "avformat.h"
33 #include "avi.h"
34 #include "dv.h"
35 #include "internal.h"
36 #include "isom.h"
37 #include "riff.h"
38 #include "libavcodec/bytestream.h"
39 #include "libavcodec/exif.h"
40 #include "libavcodec/internal.h"
41 
42 typedef struct AVIStream {
43  int64_t frame_offset; /* current frame (video) or byte (audio) counter
44  * (used to compute the pts) */
45  int remaining;
47 
48  uint32_t handler;
49  uint32_t scale;
50  uint32_t rate;
51  int sample_size; /* size of one sample (or packet)
52  * (in the rate/scale sense) in bytes */
53 
54  int64_t cum_len; /* temporary storage (used during seek) */
55  int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
57  uint32_t pal[256];
58  int has_pal;
59  int dshow_block_align; /* block align variable used to emulate bugs in
60  * the MS dshow demuxer */
61 
65 
66  int64_t seek_pos;
67 } AVIStream;
68 
69 typedef struct AVIContext {
70  const AVClass *class;
71  int64_t riff_end;
72  int64_t movi_end;
73  int64_t fsize;
74  int64_t io_fsize;
75  int64_t movi_list;
76  int64_t last_pkt_pos;
78  int is_odml;
83  int use_odml;
84 #define MAX_ODML_DEPTH 1000
85  int64_t dts_max;
86 } AVIContext;
87 
88 
89 static const AVOption options[] = {
90  { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
91  { NULL },
92 };
93 
94 static const AVClass demuxer_class = {
95  .class_name = "avi",
96  .item_name = av_default_item_name,
97  .option = options,
98  .version = LIBAVUTIL_VERSION_INT,
99  .category = AV_CLASS_CATEGORY_DEMUXER,
100 };
101 
102 
103 static const char avi_headers[][8] = {
104  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
105  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
106  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
107  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
108  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
109  { 0 }
110 };
111 
113  { "strn", "title" },
114  { 0 },
115 };
116 
117 static int avi_load_index(AVFormatContext *s);
118 static int guess_ni_flag(AVFormatContext *s);
119 
120 #define print_tag(str, tag, size) \
121  av_log(NULL, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
122  avio_tell(pb), str, tag & 0xff, \
123  (tag >> 8) & 0xff, \
124  (tag >> 16) & 0xff, \
125  (tag >> 24) & 0xff, \
126  size)
127 
128 static inline int get_duration(AVIStream *ast, int len)
129 {
130  if (ast->sample_size)
131  return len;
132  else if (ast->dshow_block_align)
133  return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
134  else
135  return 1;
136 }
137 
139 {
140  AVIContext *avi = s->priv_data;
141  char header[8] = {0};
142  int i;
143 
144  /* check RIFF header */
145  avio_read(pb, header, 4);
146  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
147  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
148  avio_read(pb, header + 4, 4);
149 
150  for (i = 0; avi_headers[i][0]; i++)
151  if (!memcmp(header, avi_headers[i], 8))
152  break;
153  if (!avi_headers[i][0])
154  return AVERROR_INVALIDDATA;
155 
156  if (header[7] == 0x19)
157  av_log(s, AV_LOG_INFO,
158  "This file has been generated by a totally broken muxer.\n");
159 
160  return 0;
161 }
162 
163 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
164 {
165  AVIContext *avi = s->priv_data;
166  AVIOContext *pb = s->pb;
167  int longs_pre_entry = avio_rl16(pb);
168  int index_sub_type = avio_r8(pb);
169  int index_type = avio_r8(pb);
170  int entries_in_use = avio_rl32(pb);
171  int chunk_id = avio_rl32(pb);
172  int64_t base = avio_rl64(pb);
173  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
174  ((chunk_id >> 8 & 0xFF) - '0');
175  AVStream *st;
176  AVIStream *ast;
177  int i;
178  int64_t last_pos = -1;
179  int64_t filesize = avi->fsize;
180 
181  av_log(s, AV_LOG_TRACE,
182  "longs_pre_entry:%d index_type:%d entries_in_use:%d "
183  "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
184  longs_pre_entry,
185  index_type,
186  entries_in_use,
187  chunk_id,
188  base,
189  frame_num);
190 
191  if (stream_id >= s->nb_streams || stream_id < 0)
192  return AVERROR_INVALIDDATA;
193  st = s->streams[stream_id];
194  ast = st->priv_data;
195 
196  if (index_sub_type)
197  return AVERROR_INVALIDDATA;
198 
199  avio_rl32(pb);
200 
201  if (index_type && longs_pre_entry != 2)
202  return AVERROR_INVALIDDATA;
203  if (index_type > 1)
204  return AVERROR_INVALIDDATA;
205 
206  if (filesize > 0 && base >= filesize) {
207  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
208  if (base >> 32 == (base & 0xFFFFFFFF) &&
209  (base & 0xFFFFFFFF) < filesize &&
210  filesize <= 0xFFFFFFFF)
211  base &= 0xFFFFFFFF;
212  else
213  return AVERROR_INVALIDDATA;
214  }
215 
216  for (i = 0; i < entries_in_use; i++) {
217  if (index_type) {
218  int64_t pos = avio_rl32(pb) + base - 8;
219  int len = avio_rl32(pb);
220  int key = len >= 0;
221  len &= 0x7FFFFFFF;
222 
223  av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
224 
225  if (avio_feof(pb))
226  return AVERROR_INVALIDDATA;
227 
228  if (last_pos == pos || pos == base - 8)
229  avi->non_interleaved = 1;
230  if (last_pos != pos && len)
231  av_add_index_entry(st, pos, ast->cum_len, len, 0,
232  key ? AVINDEX_KEYFRAME : 0);
233 
234  ast->cum_len += get_duration(ast, len);
235  last_pos = pos;
236  } else {
237  int64_t offset, pos;
238  int duration;
239  offset = avio_rl64(pb);
240  avio_rl32(pb); /* size */
241  duration = avio_rl32(pb);
242 
243  if (avio_feof(pb))
244  return AVERROR_INVALIDDATA;
245 
246  pos = avio_tell(pb);
247 
248  if (avi->odml_depth > MAX_ODML_DEPTH) {
249  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
250  return AVERROR_INVALIDDATA;
251  }
252 
253  if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
254  return -1;
255  avi->odml_depth++;
256  read_braindead_odml_indx(s, frame_num);
257  avi->odml_depth--;
258  frame_num += duration;
259 
260  if (avio_seek(pb, pos, SEEK_SET) < 0) {
261  av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
262  return -1;
263  }
264 
265  }
266  }
267  avi->index_loaded = 2;
268  return 0;
269 }
270 
272 {
273  int i;
274  int64_t j;
275 
276  for (i = 0; i < s->nb_streams; i++) {
277  AVStream *st = s->streams[i];
278  AVIStream *ast = st->priv_data;
279  int n = st->nb_index_entries;
280  int max = ast->sample_size;
281  int64_t pos, size, ts;
282 
283  if (n != 1 || ast->sample_size == 0)
284  continue;
285 
286  while (max < 1024)
287  max += max;
288 
289  pos = st->index_entries[0].pos;
290  size = st->index_entries[0].size;
291  ts = st->index_entries[0].timestamp;
292 
293  for (j = 0; j < size; j += max)
294  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
296  }
297 }
298 
299 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
300  uint32_t size)
301 {
302  AVIOContext *pb = s->pb;
303  char key[5] = { 0 };
304  char *value;
305 
306  size += (size & 1);
307 
308  if (size == UINT_MAX)
309  return AVERROR(EINVAL);
310  value = av_malloc(size + 1);
311  if (!value)
312  return AVERROR(ENOMEM);
313  if (avio_read(pb, value, size) != size)
314  return AVERROR_INVALIDDATA;
315  value[size] = 0;
316 
317  AV_WL32(key, tag);
318 
319  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
321 }
322 
323 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
324  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
325 
326 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
327 {
328  char month[4], time[9], buffer[64];
329  int i, day, year;
330  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
331  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
332  month, &day, time, &year) == 4) {
333  for (i = 0; i < 12; i++)
334  if (!av_strcasecmp(month, months[i])) {
335  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
336  year, i + 1, day, time);
337  av_dict_set(metadata, "creation_time", buffer, 0);
338  }
339  } else if (date[4] == '/' && date[7] == '/') {
340  date[4] = date[7] = '-';
341  av_dict_set(metadata, "creation_time", date, 0);
342  }
343 }
344 
345 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
346 {
347  while (avio_tell(s->pb) < end) {
348  uint32_t tag = avio_rl32(s->pb);
349  uint32_t size = avio_rl32(s->pb);
350  switch (tag) {
351  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
352  {
353  uint64_t tag_end = avio_tell(s->pb) + size;
354  while (avio_tell(s->pb) < tag_end) {
355  uint16_t tag = avio_rl16(s->pb);
356  uint16_t size = avio_rl16(s->pb);
357  const char *name = NULL;
358  char buffer[64] = { 0 };
359  size = FFMIN(size, tag_end - avio_tell(s->pb));
360  size -= avio_read(s->pb, buffer,
361  FFMIN(size, sizeof(buffer) - 1));
362  switch (tag) {
363  case 0x03:
364  name = "maker";
365  break;
366  case 0x04:
367  name = "model";
368  break;
369  case 0x13:
370  name = "creation_time";
371  if (buffer[4] == ':' && buffer[7] == ':')
372  buffer[4] = buffer[7] = '-';
373  break;
374  }
375  if (name)
376  av_dict_set(&s->metadata, name, buffer, 0);
377  avio_skip(s->pb, size);
378  }
379  break;
380  }
381  default:
382  avio_skip(s->pb, size);
383  break;
384  }
385  }
386 }
387 
389 {
390  GetByteContext gb;
391  uint8_t *data = st->codec->extradata;
392  int data_size = st->codec->extradata_size;
393  int tag, offset;
394 
395  if (!data || data_size < 8) {
396  return AVERROR_INVALIDDATA;
397  }
398 
399  bytestream2_init(&gb, data, data_size);
400 
401  tag = bytestream2_get_le32(&gb);
402 
403  switch (tag) {
404  case MKTAG('A', 'V', 'I', 'F'):
405  // skip 4 byte padding
406  bytestream2_skip(&gb, 4);
407  offset = bytestream2_tell(&gb);
408  bytestream2_init(&gb, data + offset, data_size - offset);
409 
410  // decode EXIF tags from IFD, AVI is always little-endian
411  return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
412  break;
413  case MKTAG('C', 'A', 'S', 'I'):
414  avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
415  break;
416  case MKTAG('Z', 'o', 'r', 'a'):
417  avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag);
418  break;
419  default:
420  break;
421  }
422 
423  return 0;
424 }
425 
427 {
428  AVIContext *avi = s->priv_data;
429  int i, j;
430  int64_t lensum = 0;
431  int64_t maxpos = 0;
432 
433  for (i = 0; i<s->nb_streams; i++) {
434  int64_t len = 0;
435  AVStream *st = s->streams[i];
436 
437  if (!st->nb_index_entries)
438  continue;
439 
440  for (j = 0; j < st->nb_index_entries; j++)
441  len += st->index_entries[j].size;
442  maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
443  lensum += len;
444  }
445  if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
446  return 0;
447  if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
448  return 0;
449 
450  for (i = 0; i<s->nb_streams; i++) {
451  int64_t len = 0;
452  AVStream *st = s->streams[i];
453  int64_t duration;
454  int64_t bitrate;
455 
456  for (j = 0; j < st->nb_index_entries; j++)
457  len += st->index_entries[j].size;
458 
459  if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
460  continue;
461  duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
462  bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
463  if (bitrate <= INT_MAX && bitrate > 0) {
464  st->codec->bit_rate = bitrate;
465  }
466  }
467  return 1;
468 }
469 
471 {
472  AVIContext *avi = s->priv_data;
473  AVIOContext *pb = s->pb;
474  unsigned int tag, tag1, handler;
475  int codec_type, stream_index, frame_period;
476  unsigned int size;
477  int i;
478  AVStream *st;
479  AVIStream *ast = NULL;
480  int avih_width = 0, avih_height = 0;
481  int amv_file_format = 0;
482  uint64_t list_end = 0;
483  int ret;
484  AVDictionaryEntry *dict_entry;
485 
486  avi->stream_index = -1;
487 
488  ret = get_riff(s, pb);
489  if (ret < 0)
490  return ret;
491 
492  av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
493 
494  avi->io_fsize = avi->fsize = avio_size(pb);
495  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
496  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
497 
498  /* first list tag */
499  stream_index = -1;
500  codec_type = -1;
501  frame_period = 0;
502  for (;;) {
503  if (avio_feof(pb))
504  goto fail;
505  tag = avio_rl32(pb);
506  size = avio_rl32(pb);
507 
508  print_tag("tag", tag, size);
509 
510  switch (tag) {
511  case MKTAG('L', 'I', 'S', 'T'):
512  list_end = avio_tell(pb) + size;
513  /* Ignored, except at start of video packets. */
514  tag1 = avio_rl32(pb);
515 
516  print_tag("list", tag1, 0);
517 
518  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
519  avi->movi_list = avio_tell(pb) - 4;
520  if (size)
521  avi->movi_end = avi->movi_list + size + (size & 1);
522  else
523  avi->movi_end = avi->fsize;
524  av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
525  goto end_of_header;
526  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
527  ff_read_riff_info(s, size - 4);
528  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
529  avi_read_nikon(s, list_end);
530 
531  break;
532  case MKTAG('I', 'D', 'I', 'T'):
533  {
534  unsigned char date[64] = { 0 };
535  size += (size & 1);
536  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
537  avio_skip(pb, size);
539  break;
540  }
541  case MKTAG('d', 'm', 'l', 'h'):
542  avi->is_odml = 1;
543  avio_skip(pb, size + (size & 1));
544  break;
545  case MKTAG('a', 'm', 'v', 'h'):
546  amv_file_format = 1;
547  case MKTAG('a', 'v', 'i', 'h'):
548  /* AVI header */
549  /* using frame_period is bad idea */
550  frame_period = avio_rl32(pb);
551  avio_rl32(pb); /* max. bytes per second */
552  avio_rl32(pb);
554 
555  avio_skip(pb, 2 * 4);
556  avio_rl32(pb);
557  avio_rl32(pb);
558  avih_width = avio_rl32(pb);
559  avih_height = avio_rl32(pb);
560 
561  avio_skip(pb, size - 10 * 4);
562  break;
563  case MKTAG('s', 't', 'r', 'h'):
564  /* stream header */
565 
566  tag1 = avio_rl32(pb);
567  handler = avio_rl32(pb); /* codec tag */
568 
569  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
570  avio_skip(pb, size - 8);
571  break;
572  } else {
573  stream_index++;
574  st = avformat_new_stream(s, NULL);
575  if (!st)
576  goto fail;
577 
578  st->id = stream_index;
579  ast = av_mallocz(sizeof(AVIStream));
580  if (!ast)
581  goto fail;
582  st->priv_data = ast;
583  }
584  if (amv_file_format)
585  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
586  : MKTAG('v', 'i', 'd', 's');
587 
588  print_tag("strh", tag1, -1);
589 
590  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
591  tag1 == MKTAG('i', 'v', 'a', 's')) {
592  int64_t dv_dur;
593 
594  /* After some consideration -- I don't think we
595  * have to support anything but DV in type1 AVIs. */
596  if (s->nb_streams != 1)
597  goto fail;
598 
599  if (handler != MKTAG('d', 'v', 's', 'd') &&
600  handler != MKTAG('d', 'v', 'h', 'd') &&
601  handler != MKTAG('d', 'v', 's', 'l'))
602  goto fail;
603 
604  ast = s->streams[0]->priv_data;
605  av_freep(&s->streams[0]->codec->extradata);
606  av_freep(&s->streams[0]->codec);
607  if (s->streams[0]->info)
609  av_freep(&s->streams[0]->info);
610  av_freep(&s->streams[0]);
611  s->nb_streams = 0;
612  if (CONFIG_DV_DEMUXER) {
613  avi->dv_demux = avpriv_dv_init_demux(s);
614  if (!avi->dv_demux)
615  goto fail;
616  } else
617  goto fail;
618  s->streams[0]->priv_data = ast;
619  avio_skip(pb, 3 * 4);
620  ast->scale = avio_rl32(pb);
621  ast->rate = avio_rl32(pb);
622  avio_skip(pb, 4); /* start time */
623 
624  dv_dur = avio_rl32(pb);
625  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
626  dv_dur *= AV_TIME_BASE;
627  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
628  }
629  /* else, leave duration alone; timing estimation in utils.c
630  * will make a guess based on bitrate. */
631 
632  stream_index = s->nb_streams - 1;
633  avio_skip(pb, size - 9 * 4);
634  break;
635  }
636 
637  av_assert0(stream_index < s->nb_streams);
638  ast->handler = handler;
639 
640  avio_rl32(pb); /* flags */
641  avio_rl16(pb); /* priority */
642  avio_rl16(pb); /* language */
643  avio_rl32(pb); /* initial frame */
644  ast->scale = avio_rl32(pb);
645  ast->rate = avio_rl32(pb);
646  if (!(ast->scale && ast->rate)) {
648  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
649  "(This file has been generated by broken software.)\n",
650  ast->scale,
651  ast->rate);
652  if (frame_period) {
653  ast->rate = 1000000;
654  ast->scale = frame_period;
655  } else {
656  ast->rate = 25;
657  ast->scale = 1;
658  }
659  }
660  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
661 
662  ast->cum_len = avio_rl32(pb); /* start */
663  st->nb_frames = avio_rl32(pb);
664 
665  st->start_time = 0;
666  avio_rl32(pb); /* buffer size */
667  avio_rl32(pb); /* quality */
668  if (ast->cum_len*ast->scale/ast->rate > 3600) {
669  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
670  ast->cum_len = 0;
671  }
672  ast->sample_size = avio_rl32(pb); /* sample ssize */
673  ast->cum_len *= FFMAX(1, ast->sample_size);
674  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
675  ast->rate, ast->scale, ast->sample_size);
676 
677  switch (tag1) {
678  case MKTAG('v', 'i', 'd', 's'):
679  codec_type = AVMEDIA_TYPE_VIDEO;
680 
681  ast->sample_size = 0;
682  st->avg_frame_rate = av_inv_q(st->time_base);
683  break;
684  case MKTAG('a', 'u', 'd', 's'):
685  codec_type = AVMEDIA_TYPE_AUDIO;
686  break;
687  case MKTAG('t', 'x', 't', 's'):
688  codec_type = AVMEDIA_TYPE_SUBTITLE;
689  break;
690  case MKTAG('d', 'a', 't', 's'):
691  codec_type = AVMEDIA_TYPE_DATA;
692  break;
693  default:
694  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
695  }
696 
697  if (ast->sample_size < 0) {
698  if (s->error_recognition & AV_EF_EXPLODE) {
699  av_log(s, AV_LOG_ERROR,
700  "Invalid sample_size %d at stream %d\n",
701  ast->sample_size,
702  stream_index);
703  goto fail;
704  }
706  "Invalid sample_size %d at stream %d "
707  "setting it to 0\n",
708  ast->sample_size,
709  stream_index);
710  ast->sample_size = 0;
711  }
712 
713  if (ast->sample_size == 0) {
714  st->duration = st->nb_frames;
715  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
716  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
717  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
718  }
719  }
720  ast->frame_offset = ast->cum_len;
721  avio_skip(pb, size - 12 * 4);
722  break;
723  case MKTAG('s', 't', 'r', 'f'):
724  /* stream header */
725  if (!size)
726  break;
727  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
728  avio_skip(pb, size);
729  } else {
730  uint64_t cur_pos = avio_tell(pb);
731  unsigned esize;
732  if (cur_pos < list_end)
733  size = FFMIN(size, list_end - cur_pos);
734  st = s->streams[stream_index];
735  if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
736  avio_skip(pb, size);
737  break;
738  }
739  switch (codec_type) {
740  case AVMEDIA_TYPE_VIDEO:
741  if (amv_file_format) {
742  st->codec->width = avih_width;
743  st->codec->height = avih_height;
746  avio_skip(pb, size);
747  break;
748  }
749  tag1 = ff_get_bmp_header(pb, st, &esize);
750 
751  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
752  tag1 == MKTAG('D', 'X', 'S', 'A')) {
754  st->codec->codec_tag = tag1;
756  break;
757  }
758 
759  if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
760  if (esize == size-1 && (esize&1)) {
761  st->codec->extradata_size = esize - 10 * 4;
762  } else
763  st->codec->extradata_size = size - 10 * 4;
764  if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
765  return AVERROR(ENOMEM);
766  }
767 
768  // FIXME: check if the encoder really did this correctly
769  if (st->codec->extradata_size & 1)
770  avio_r8(pb);
771 
772  /* Extract palette from extradata if bpp <= 8.
773  * This code assumes that extradata contains only palette.
774  * This is true for all paletted codecs implemented in
775  * FFmpeg. */
776  if (st->codec->extradata_size &&
777  (st->codec->bits_per_coded_sample <= 8)) {
778  int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
779  const uint8_t *pal_src;
780 
781  pal_size = FFMIN(pal_size, st->codec->extradata_size);
782  pal_src = st->codec->extradata +
783  st->codec->extradata_size - pal_size;
784  /* Exclude the "BottomUp" field from the palette */
785  if (pal_src - st->codec->extradata >= 9 &&
786  !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
787  pal_src -= 9;
788  for (i = 0; i < pal_size / 4; i++)
789  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
790  ast->has_pal = 1;
791  }
792 
793  print_tag("video", tag1, 0);
794 
796  st->codec->codec_tag = tag1;
798  tag1);
799  /* If codec is not found yet, try with the mov tags. */
800  if (!st->codec->codec_id) {
801  char tag_buf[32];
802  av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1);
803  st->codec->codec_id =
805  if (st->codec->codec_id)
807  "mov tag found in avi (fourcc %s)\n",
808  tag_buf);
809  }
810  /* This is needed to get the pict type which is necessary
811  * for generating correct pts. */
813 
814  if (st->codec->codec_id == AV_CODEC_ID_MPEG4 &&
815  ast->handler == MKTAG('X', 'V', 'I', 'D'))
816  st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D');
817 
818  if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
820 
821  if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
822  st->codec->extradata_size < 1U << 30) {
823  st->codec->extradata_size += 9;
824  if ((ret = av_reallocp(&st->codec->extradata,
825  st->codec->extradata_size +
827  st->codec->extradata_size = 0;
828  return ret;
829  } else
830  memcpy(st->codec->extradata + st->codec->extradata_size - 9,
831  "BottomUp", 9);
832  }
833  st->codec->height = FFABS(st->codec->height);
834 
835 // avio_skip(pb, size - 5 * 4);
836  break;
837  case AVMEDIA_TYPE_AUDIO:
838  ret = ff_get_wav_header(s, pb, st->codec, size, 0);
839  if (ret < 0)
840  return ret;
841  ast->dshow_block_align = st->codec->block_align;
842  if (ast->sample_size && st->codec->block_align &&
843  ast->sample_size != st->codec->block_align) {
844  av_log(s,
846  "sample size (%d) != block align (%d)\n",
847  ast->sample_size,
848  st->codec->block_align);
849  ast->sample_size = st->codec->block_align;
850  }
851  /* 2-aligned
852  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
853  if (size & 1)
854  avio_skip(pb, 1);
855  /* Force parsing as several audio frames can be in
856  * one packet and timestamps refer to packet start. */
858  /* ADTS header is in extradata, AAC without header must be
859  * stored as exact frames. Parser not needed and it will
860  * fail. */
861  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
862  st->codec->extradata_size)
864  /* AVI files with Xan DPCM audio (wrongly) declare PCM
865  * audio in the header but have Axan as stream_code_tag. */
866  if (ast->handler == AV_RL32("Axan")) {
868  st->codec->codec_tag = 0;
869  ast->dshow_block_align = 0;
870  }
871  if (amv_file_format) {
873  ast->dshow_block_align = 0;
874  }
875  if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align ||
876  st->codec->codec_id == AV_CODEC_ID_MP2 && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
877  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
878  ast->dshow_block_align = 0;
879  }
880  if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
881  st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
882  st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
883  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
884  ast->sample_size = 0;
885  }
886  break;
889  st->request_probe= 1;
890  avio_skip(pb, size);
891  break;
892  default:
895  st->codec->codec_tag = 0;
896  avio_skip(pb, size);
897  break;
898  }
899  }
900  break;
901  case MKTAG('s', 't', 'r', 'd'):
902  if (stream_index >= (unsigned)s->nb_streams
903  || s->streams[stream_index]->codec->extradata_size
904  || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
905  avio_skip(pb, size);
906  } else {
907  uint64_t cur_pos = avio_tell(pb);
908  if (cur_pos < list_end)
909  size = FFMIN(size, list_end - cur_pos);
910  st = s->streams[stream_index];
911 
912  if (size<(1<<30)) {
913  if (ff_get_extradata(st->codec, pb, size) < 0)
914  return AVERROR(ENOMEM);
915  }
916 
917  if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
918  avio_r8(pb);
919 
920  ret = avi_extract_stream_metadata(st);
921  if (ret < 0) {
922  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
923  }
924  }
925  break;
926  case MKTAG('i', 'n', 'd', 'x'):
927  i = avio_tell(pb);
928  if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
929  avi->use_odml &&
930  read_braindead_odml_indx(s, 0) < 0 &&
932  goto fail;
933  avio_seek(pb, i + size, SEEK_SET);
934  break;
935  case MKTAG('v', 'p', 'r', 'p'):
936  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
937  AVRational active, active_aspect;
938 
939  st = s->streams[stream_index];
940  avio_rl32(pb);
941  avio_rl32(pb);
942  avio_rl32(pb);
943  avio_rl32(pb);
944  avio_rl32(pb);
945 
946  active_aspect.den = avio_rl16(pb);
947  active_aspect.num = avio_rl16(pb);
948  active.num = avio_rl32(pb);
949  active.den = avio_rl32(pb);
950  avio_rl32(pb); // nbFieldsPerFrame
951 
952  if (active_aspect.num && active_aspect.den &&
953  active.num && active.den) {
954  st->sample_aspect_ratio = av_div_q(active_aspect, active);
955  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
956  active_aspect.num, active_aspect.den,
957  active.num, active.den);
958  }
959  size -= 9 * 4;
960  }
961  avio_skip(pb, size);
962  break;
963  case MKTAG('s', 't', 'r', 'n'):
964  if (s->nb_streams) {
965  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
966  if (ret < 0)
967  return ret;
968  break;
969  }
970  default:
971  if (size > 1000000) {
972  av_log(s, AV_LOG_ERROR,
973  "Something went wrong during header parsing, "
974  "I will ignore it and try to continue anyway.\n");
976  goto fail;
977  avi->movi_list = avio_tell(pb) - 4;
978  avi->movi_end = avi->fsize;
979  goto end_of_header;
980  }
981  /* skip tag */
982  size += (size & 1);
983  avio_skip(pb, size);
984  break;
985  }
986  }
987 
988 end_of_header:
989  /* check stream number */
990  if (stream_index != s->nb_streams - 1) {
991 
992 fail:
993  return AVERROR_INVALIDDATA;
994  }
995 
996  if (!avi->index_loaded && pb->seekable)
997  avi_load_index(s);
999  avi->index_loaded |= 1;
1000 
1001  if ((ret = guess_ni_flag(s)) < 0)
1002  return ret;
1003 
1004  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1005 
1006  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1007  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1008  for (i = 0; i < s->nb_streams; i++) {
1009  AVStream *st = s->streams[i];
1013  }
1014 
1015  for (i = 0; i < s->nb_streams; i++) {
1016  AVStream *st = s->streams[i];
1017  if (st->nb_index_entries)
1018  break;
1019  }
1020  // DV-in-AVI cannot be non-interleaved, if set this must be
1021  // a mis-detection.
1022  if (avi->dv_demux)
1023  avi->non_interleaved = 0;
1024  if (i == s->nb_streams && avi->non_interleaved) {
1026  "Non-interleaved AVI without index, switching to interleaved\n");
1027  avi->non_interleaved = 0;
1028  }
1029 
1030  if (avi->non_interleaved) {
1031  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1032  clean_index(s);
1033  }
1034 
1035  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1037 
1038  return 0;
1039 }
1040 
1042 {
1043  if (pkt->size >= 7 &&
1044  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1045  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1046  uint8_t desc[256];
1047  int score = AVPROBE_SCORE_EXTENSION, ret;
1048  AVIStream *ast = st->priv_data;
1049  AVInputFormat *sub_demuxer;
1050  AVRational time_base;
1051  int size;
1052  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1053  pkt->size - 7,
1054  0, NULL, NULL, NULL, NULL);
1055  AVProbeData pd;
1056  unsigned int desc_len = avio_rl32(pb);
1057 
1058  if (desc_len > pb->buf_end - pb->buf_ptr)
1059  goto error;
1060 
1061  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1062  avio_skip(pb, desc_len - ret);
1063  if (*desc)
1064  av_dict_set(&st->metadata, "title", desc, 0);
1065 
1066  avio_rl16(pb); /* flags? */
1067  avio_rl32(pb); /* data size */
1068 
1069  size = pb->buf_end - pb->buf_ptr;
1070  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1071  .buf_size = size };
1072  if (!pd.buf)
1073  goto error;
1074  memcpy(pd.buf, pb->buf_ptr, size);
1075  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1076  av_freep(&pd.buf);
1077  if (!sub_demuxer)
1078  goto error;
1079 
1080  if (!(ast->sub_ctx = avformat_alloc_context()))
1081  goto error;
1082 
1083  ast->sub_ctx->pb = pb;
1084 
1085  if (ff_copy_whitelists(ast->sub_ctx, s) < 0)
1086  goto error;
1087 
1088  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1089  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1090  *st->codec = *ast->sub_ctx->streams[0]->codec;
1091  ast->sub_ctx->streams[0]->codec->extradata = NULL;
1092  time_base = ast->sub_ctx->streams[0]->time_base;
1093  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1094  }
1095  ast->sub_buffer = pkt->data;
1096  memset(pkt, 0, sizeof(*pkt));
1097  return 1;
1098 
1099 error:
1100  av_freep(&ast->sub_ctx);
1101  av_freep(&pb);
1102  }
1103  return 0;
1104 }
1105 
1107  AVPacket *pkt)
1108 {
1109  AVIStream *ast, *next_ast = next_st->priv_data;
1110  int64_t ts, next_ts, ts_min = INT64_MAX;
1111  AVStream *st, *sub_st = NULL;
1112  int i;
1113 
1114  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1115  AV_TIME_BASE_Q);
1116 
1117  for (i = 0; i < s->nb_streams; i++) {
1118  st = s->streams[i];
1119  ast = st->priv_data;
1120  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1121  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1122  if (ts <= next_ts && ts < ts_min) {
1123  ts_min = ts;
1124  sub_st = st;
1125  }
1126  }
1127  }
1128 
1129  if (sub_st) {
1130  ast = sub_st->priv_data;
1131  *pkt = ast->sub_pkt;
1132  pkt->stream_index = sub_st->index;
1133 
1134  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1135  ast->sub_pkt.data = NULL;
1136  }
1137  return sub_st;
1138 }
1139 
1140 static int get_stream_idx(const unsigned *d)
1141 {
1142  if (d[0] >= '0' && d[0] <= '9' &&
1143  d[1] >= '0' && d[1] <= '9') {
1144  return (d[0] - '0') * 10 + (d[1] - '0');
1145  } else {
1146  return 100; // invalid stream ID
1147  }
1148 }
1149 
1150 /**
1151  *
1152  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1153  */
1154 static int avi_sync(AVFormatContext *s, int exit_early)
1155 {
1156  AVIContext *avi = s->priv_data;
1157  AVIOContext *pb = s->pb;
1158  int n;
1159  unsigned int d[8];
1160  unsigned int size;
1161  int64_t i, sync;
1162 
1163 start_sync:
1164  memset(d, -1, sizeof(d));
1165  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1166  int j;
1167 
1168  for (j = 0; j < 7; j++)
1169  d[j] = d[j + 1];
1170  d[7] = avio_r8(pb);
1171 
1172  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1173 
1174  n = get_stream_idx(d + 2);
1175  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1176  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1177  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1178  continue;
1179 
1180  // parse ix##
1181  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1182  // parse JUNK
1183  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1184  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1185  avio_skip(pb, size);
1186  goto start_sync;
1187  }
1188 
1189  // parse stray LIST
1190  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1191  avio_skip(pb, 4);
1192  goto start_sync;
1193  }
1194 
1195  n = get_stream_idx(d);
1196 
1197  if (!((i - avi->last_pkt_pos) & 1) &&
1198  get_stream_idx(d + 1) < s->nb_streams)
1199  continue;
1200 
1201  // detect ##ix chunk and skip
1202  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1203  avio_skip(pb, size);
1204  goto start_sync;
1205  }
1206 
1207  if (avi->dv_demux && n != 0)
1208  continue;
1209 
1210  // parse ##dc/##wb
1211  if (n < s->nb_streams) {
1212  AVStream *st;
1213  AVIStream *ast;
1214  st = s->streams[n];
1215  ast = st->priv_data;
1216 
1217  if (!ast) {
1218  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1219  continue;
1220  }
1221 
1222  if (s->nb_streams >= 2) {
1223  AVStream *st1 = s->streams[1];
1224  AVIStream *ast1 = st1->priv_data;
1225  // workaround for broken small-file-bug402.avi
1226  if ( d[2] == 'w' && d[3] == 'b'
1227  && n == 0
1228  && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1229  && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1230  && ast->prefix == 'd'*256+'c'
1231  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1232  ) {
1233  n = 1;
1234  st = st1;
1235  ast = ast1;
1237  "Invalid stream + prefix combination, assuming audio.\n");
1238  }
1239  }
1240 
1241  if (!avi->dv_demux &&
1242  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1243  // FIXME: needs a little reordering
1244  (st->discard >= AVDISCARD_NONKEY &&
1245  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1246  || st->discard >= AVDISCARD_ALL)) {
1247  if (!exit_early) {
1248  ast->frame_offset += get_duration(ast, size);
1249  avio_skip(pb, size);
1250  goto start_sync;
1251  }
1252  }
1253 
1254  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1255  int k = avio_r8(pb);
1256  int last = (k + avio_r8(pb) - 1) & 0xFF;
1257 
1258  avio_rl16(pb); // flags
1259 
1260  // b + (g << 8) + (r << 16);
1261  for (; k <= last; k++)
1262  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1263 
1264  ast->has_pal = 1;
1265  goto start_sync;
1266  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1267  d[2] < 128 && d[3] < 128) ||
1268  d[2] * 256 + d[3] == ast->prefix /* ||
1269  (d[2] == 'd' && d[3] == 'c') ||
1270  (d[2] == 'w' && d[3] == 'b') */) {
1271  if (exit_early)
1272  return 0;
1273  if (d[2] * 256 + d[3] == ast->prefix)
1274  ast->prefix_count++;
1275  else {
1276  ast->prefix = d[2] * 256 + d[3];
1277  ast->prefix_count = 0;
1278  }
1279 
1280  avi->stream_index = n;
1281  ast->packet_size = size + 8;
1282  ast->remaining = size;
1283 
1284  if (size) {
1285  uint64_t pos = avio_tell(pb) - 8;
1286  if (!st->index_entries || !st->nb_index_entries ||
1287  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1288  av_add_index_entry(st, pos, ast->frame_offset, size,
1289  0, AVINDEX_KEYFRAME);
1290  }
1291  }
1292  return 0;
1293  }
1294  }
1295  }
1296 
1297  if (pb->error)
1298  return pb->error;
1299  return AVERROR_EOF;
1300 }
1301 
1303 {
1304  AVIContext *avi = s->priv_data;
1305  AVIOContext *pb = s->pb;
1306  int err;
1307 #if FF_API_DESTRUCT_PACKET
1308  void *dstr;
1309 #endif
1310 
1311  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1312  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1313  if (size >= 0)
1314  return size;
1315  else
1316  goto resync;
1317  }
1318 
1319  if (avi->non_interleaved) {
1320  int best_stream_index = 0;
1321  AVStream *best_st = NULL;
1322  AVIStream *best_ast;
1323  int64_t best_ts = INT64_MAX;
1324  int i;
1325 
1326  for (i = 0; i < s->nb_streams; i++) {
1327  AVStream *st = s->streams[i];
1328  AVIStream *ast = st->priv_data;
1329  int64_t ts = ast->frame_offset;
1330  int64_t last_ts;
1331 
1332  if (!st->nb_index_entries)
1333  continue;
1334 
1335  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1336  if (!ast->remaining && ts > last_ts)
1337  continue;
1338 
1339  ts = av_rescale_q(ts, st->time_base,
1340  (AVRational) { FFMAX(1, ast->sample_size),
1341  AV_TIME_BASE });
1342 
1343  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1344  st->time_base.num, st->time_base.den, ast->frame_offset);
1345  if (ts < best_ts) {
1346  best_ts = ts;
1347  best_st = st;
1348  best_stream_index = i;
1349  }
1350  }
1351  if (!best_st)
1352  return AVERROR_EOF;
1353 
1354  best_ast = best_st->priv_data;
1355  best_ts = best_ast->frame_offset;
1356  if (best_ast->remaining) {
1357  i = av_index_search_timestamp(best_st,
1358  best_ts,
1359  AVSEEK_FLAG_ANY |
1361  } else {
1362  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1363  if (i >= 0)
1364  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1365  }
1366 
1367  if (i >= 0) {
1368  int64_t pos = best_st->index_entries[i].pos;
1369  pos += best_ast->packet_size - best_ast->remaining;
1370  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1371  return AVERROR_EOF;
1372 
1373  av_assert0(best_ast->remaining <= best_ast->packet_size);
1374 
1375  avi->stream_index = best_stream_index;
1376  if (!best_ast->remaining)
1377  best_ast->packet_size =
1378  best_ast->remaining = best_st->index_entries[i].size;
1379  }
1380  else
1381  return AVERROR_EOF;
1382  }
1383 
1384 resync:
1385  if (avi->stream_index >= 0) {
1386  AVStream *st = s->streams[avi->stream_index];
1387  AVIStream *ast = st->priv_data;
1388  int size, err;
1389 
1390  if (get_subtitle_pkt(s, st, pkt))
1391  return 0;
1392 
1393  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1394  if (ast->sample_size <= 1)
1395  size = INT_MAX;
1396  else if (ast->sample_size < 32)
1397  // arbitrary multiplier to avoid tiny packets for raw PCM data
1398  size = 1024 * ast->sample_size;
1399  else
1400  size = ast->sample_size;
1401 
1402  if (size > ast->remaining)
1403  size = ast->remaining;
1404  avi->last_pkt_pos = avio_tell(pb);
1405  err = av_get_packet(pb, pkt, size);
1406  if (err < 0)
1407  return err;
1408  size = err;
1409 
1410  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1411  uint8_t *pal;
1414  AVPALETTE_SIZE);
1415  if (!pal) {
1417  "Failed to allocate data for palette\n");
1418  } else {
1419  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1420  ast->has_pal = 0;
1421  }
1422  }
1423 
1424  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1425  AVBufferRef *avbuf = pkt->buf;
1426 #if FF_API_DESTRUCT_PACKET
1428  dstr = pkt->destruct;
1430 #endif
1431  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1432  pkt->data, pkt->size, pkt->pos);
1433 #if FF_API_DESTRUCT_PACKET
1435  pkt->destruct = dstr;
1437 #endif
1438  pkt->buf = avbuf;
1440  if (size < 0)
1442  } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1443  !st->codec->codec_tag && read_gab2_sub(s, st, pkt)) {
1444  ast->frame_offset++;
1445  avi->stream_index = -1;
1446  ast->remaining = 0;
1447  goto resync;
1448  } else {
1449  /* XXX: How to handle B-frames in AVI? */
1450  pkt->dts = ast->frame_offset;
1451 // pkt->dts += ast->start;
1452  if (ast->sample_size)
1453  pkt->dts /= ast->sample_size;
1455  "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1456  "base:%d st:%d size:%d\n",
1457  pkt->dts,
1458  ast->frame_offset,
1459  ast->scale,
1460  ast->rate,
1461  ast->sample_size,
1462  AV_TIME_BASE,
1463  avi->stream_index,
1464  size);
1465  pkt->stream_index = avi->stream_index;
1466 
1467  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1468  AVIndexEntry *e;
1469  int index;
1470 
1472  e = &st->index_entries[index];
1473 
1474  if (index >= 0 && e->timestamp == ast->frame_offset) {
1475  if (index == st->nb_index_entries-1) {
1476  int key=1;
1477  uint32_t state=-1;
1478  if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1479  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1480  while (ptr < end) {
1481  ptr = avpriv_find_start_code(ptr, end, &state);
1482  if (state == 0x1B6 && ptr < end) {
1483  key = !(*ptr & 0xC0);
1484  break;
1485  }
1486  }
1487  }
1488  if (!key)
1489  e->flags &= ~AVINDEX_KEYFRAME;
1490  }
1491  if (e->flags & AVINDEX_KEYFRAME)
1493  }
1494  } else {
1496  }
1497  ast->frame_offset += get_duration(ast, pkt->size);
1498  }
1499  ast->remaining -= err;
1500  if (!ast->remaining) {
1501  avi->stream_index = -1;
1502  ast->packet_size = 0;
1503  }
1504 
1505  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1507  goto resync;
1508  }
1509  ast->seek_pos= 0;
1510 
1511  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1512  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1513 
1514  if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1515  avi->non_interleaved= 1;
1516  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1517  }else if (avi->dts_max < dts)
1518  avi->dts_max = dts;
1519  }
1520 
1521  return 0;
1522  }
1523 
1524  if ((err = avi_sync(s, 0)) < 0)
1525  return err;
1526  goto resync;
1527 }
1528 
1529 /* XXX: We make the implicit supposition that the positions are sorted
1530  * for each stream. */
1531 static int avi_read_idx1(AVFormatContext *s, int size)
1532 {
1533  AVIContext *avi = s->priv_data;
1534  AVIOContext *pb = s->pb;
1535  int nb_index_entries, i;
1536  AVStream *st;
1537  AVIStream *ast;
1538  unsigned int index, tag, flags, pos, len, first_packet = 1;
1539  unsigned last_pos = -1;
1540  unsigned last_idx = -1;
1541  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1542  int anykey = 0;
1543 
1544  nb_index_entries = size / 16;
1545  if (nb_index_entries <= 0)
1546  return AVERROR_INVALIDDATA;
1547 
1548  idx1_pos = avio_tell(pb);
1549  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1550  if (avi_sync(s, 1) == 0)
1551  first_packet_pos = avio_tell(pb) - 8;
1552  avi->stream_index = -1;
1553  avio_seek(pb, idx1_pos, SEEK_SET);
1554 
1555  if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1556  first_packet_pos = 0;
1557  data_offset = avi->movi_list;
1558  }
1559 
1560  /* Read the entries and sort them in each stream component. */
1561  for (i = 0; i < nb_index_entries; i++) {
1562  if (avio_feof(pb))
1563  return -1;
1564 
1565  tag = avio_rl32(pb);
1566  flags = avio_rl32(pb);
1567  pos = avio_rl32(pb);
1568  len = avio_rl32(pb);
1569  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1570  i, tag, flags, pos, len);
1571 
1572  index = ((tag & 0xff) - '0') * 10;
1573  index += (tag >> 8 & 0xff) - '0';
1574  if (index >= s->nb_streams)
1575  continue;
1576  st = s->streams[index];
1577  ast = st->priv_data;
1578 
1579  if (first_packet && first_packet_pos) {
1580  data_offset = first_packet_pos - pos;
1581  first_packet = 0;
1582  }
1583  pos += data_offset;
1584 
1585  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1586 
1587  // even if we have only a single stream, we should
1588  // switch to non-interleaved to get correct timestamps
1589  if (last_pos == pos)
1590  avi->non_interleaved = 1;
1591  if (last_idx != pos && len) {
1592  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1593  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1594  last_idx= pos;
1595  }
1596  ast->cum_len += get_duration(ast, len);
1597  last_pos = pos;
1598  anykey |= flags&AVIIF_INDEX;
1599  }
1600  if (!anykey) {
1601  for (index = 0; index < s->nb_streams; index++) {
1602  st = s->streams[index];
1603  if (st->nb_index_entries)
1605  }
1606  }
1607  return 0;
1608 }
1609 
1610 /* Scan the index and consider any file with streams more than
1611  * 2 seconds or 64MB apart non-interleaved. */
1613 {
1614  int64_t min_pos, pos;
1615  int i;
1616  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1617  if (!idx)
1618  return AVERROR(ENOMEM);
1619  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1620  int64_t max_dts = INT64_MIN / 2;
1621  int64_t min_dts = INT64_MAX / 2;
1622  int64_t max_buffer = 0;
1623 
1624  min_pos = INT64_MAX;
1625 
1626  for (i = 0; i < s->nb_streams; i++) {
1627  AVStream *st = s->streams[i];
1628  AVIStream *ast = st->priv_data;
1629  int n = st->nb_index_entries;
1630  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1631  idx[i]++;
1632  if (idx[i] < n) {
1633  int64_t dts;
1634  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1635  FFMAX(ast->sample_size, 1),
1636  st->time_base, AV_TIME_BASE_Q);
1637  min_dts = FFMIN(min_dts, dts);
1638  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1639  }
1640  }
1641  for (i = 0; i < s->nb_streams; i++) {
1642  AVStream *st = s->streams[i];
1643  AVIStream *ast = st->priv_data;
1644 
1645  if (idx[i] && min_dts != INT64_MAX / 2) {
1646  int64_t dts;
1647  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1648  FFMAX(ast->sample_size, 1),
1649  st->time_base, AV_TIME_BASE_Q);
1650  max_dts = FFMAX(max_dts, dts);
1651  max_buffer = FFMAX(max_buffer,
1652  av_rescale(dts - min_dts,
1653  st->codec->bit_rate,
1654  AV_TIME_BASE));
1655  }
1656  }
1657  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1658  max_buffer > 1024 * 1024 * 8 * 8) {
1659  av_free(idx);
1660  return 1;
1661  }
1662  }
1663  av_free(idx);
1664  return 0;
1665 }
1666 
1668 {
1669  int i;
1670  int64_t last_start = 0;
1671  int64_t first_end = INT64_MAX;
1672  int64_t oldpos = avio_tell(s->pb);
1673 
1674  for (i = 0; i < s->nb_streams; i++) {
1675  AVStream *st = s->streams[i];
1676  int n = st->nb_index_entries;
1677  unsigned int size;
1678 
1679  if (n <= 0)
1680  continue;
1681 
1682  if (n >= 2) {
1683  int64_t pos = st->index_entries[0].pos;
1684  unsigned tag[2];
1685  avio_seek(s->pb, pos, SEEK_SET);
1686  tag[0] = avio_r8(s->pb);
1687  tag[1] = avio_r8(s->pb);
1688  avio_rl16(s->pb);
1689  size = avio_rl32(s->pb);
1690  if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1691  last_start = INT64_MAX;
1692  }
1693 
1694  if (st->index_entries[0].pos > last_start)
1695  last_start = st->index_entries[0].pos;
1696  if (st->index_entries[n - 1].pos < first_end)
1697  first_end = st->index_entries[n - 1].pos;
1698  }
1699  avio_seek(s->pb, oldpos, SEEK_SET);
1700 
1701  if (last_start > first_end)
1702  return 1;
1703 
1704  return check_stream_max_drift(s);
1705 }
1706 
1708 {
1709  AVIContext *avi = s->priv_data;
1710  AVIOContext *pb = s->pb;
1711  uint32_t tag, size;
1712  int64_t pos = avio_tell(pb);
1713  int64_t next;
1714  int ret = -1;
1715 
1716  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1717  goto the_end; // maybe truncated file
1718  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1719  for (;;) {
1720  tag = avio_rl32(pb);
1721  size = avio_rl32(pb);
1722  if (avio_feof(pb))
1723  break;
1724  next = avio_tell(pb) + size + (size & 1);
1725 
1726  av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n",
1727  tag & 0xff,
1728  (tag >> 8) & 0xff,
1729  (tag >> 16) & 0xff,
1730  (tag >> 24) & 0xff,
1731  size);
1732 
1733  if (tag == MKTAG('i', 'd', 'x', '1') &&
1734  avi_read_idx1(s, size) >= 0) {
1735  avi->index_loaded=2;
1736  ret = 0;
1737  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1738  uint32_t tag1 = avio_rl32(pb);
1739 
1740  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1741  ff_read_riff_info(s, size - 4);
1742  }else if (!ret)
1743  break;
1744 
1745  if (avio_seek(pb, next, SEEK_SET) < 0)
1746  break; // something is wrong here
1747  }
1748 
1749 the_end:
1750  avio_seek(pb, pos, SEEK_SET);
1751  return ret;
1752 }
1753 
1754 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1755 {
1756  AVIStream *ast2 = st2->priv_data;
1757  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1758  av_free_packet(&ast2->sub_pkt);
1759  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1760  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1761  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1762 }
1763 
1764 static int avi_read_seek(AVFormatContext *s, int stream_index,
1765  int64_t timestamp, int flags)
1766 {
1767  AVIContext *avi = s->priv_data;
1768  AVStream *st;
1769  int i, index;
1770  int64_t pos, pos_min;
1771  AVIStream *ast;
1772 
1773  /* Does not matter which stream is requested dv in avi has the
1774  * stream information in the first video stream.
1775  */
1776  if (avi->dv_demux)
1777  stream_index = 0;
1778 
1779  if (!avi->index_loaded) {
1780  /* we only load the index on demand */
1781  avi_load_index(s);
1782  avi->index_loaded |= 1;
1783  }
1784  av_assert0(stream_index >= 0);
1785 
1786  st = s->streams[stream_index];
1787  ast = st->priv_data;
1788  index = av_index_search_timestamp(st,
1789  timestamp * FFMAX(ast->sample_size, 1),
1790  flags);
1791  if (index < 0) {
1792  if (st->nb_index_entries > 0)
1793  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1794  timestamp * FFMAX(ast->sample_size, 1),
1795  st->index_entries[0].timestamp,
1797  return AVERROR_INVALIDDATA;
1798  }
1799 
1800  /* find the position */
1801  pos = st->index_entries[index].pos;
1802  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1803 
1804  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1805  timestamp, index, st->index_entries[index].timestamp);
1806 
1807  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1808  /* One and only one real stream for DV in AVI, and it has video */
1809  /* offsets. Calling with other stream indexes should have failed */
1810  /* the av_index_search_timestamp call above. */
1811 
1812  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1813  return -1;
1814 
1815  /* Feed the DV video stream version of the timestamp to the */
1816  /* DV demux so it can synthesize correct timestamps. */
1817  ff_dv_offset_reset(avi->dv_demux, timestamp);
1818 
1819  avi->stream_index = -1;
1820  return 0;
1821  }
1822 
1823  pos_min = pos;
1824  for (i = 0; i < s->nb_streams; i++) {
1825  AVStream *st2 = s->streams[i];
1826  AVIStream *ast2 = st2->priv_data;
1827 
1828  ast2->packet_size =
1829  ast2->remaining = 0;
1830 
1831  if (ast2->sub_ctx) {
1832  seek_subtitle(st, st2, timestamp);
1833  continue;
1834  }
1835 
1836  if (st2->nb_index_entries <= 0)
1837  continue;
1838 
1839 // av_assert1(st2->codec->block_align);
1840  av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
1841  index = av_index_search_timestamp(st2,
1842  av_rescale_q(timestamp,
1843  st->time_base,
1844  st2->time_base) *
1845  FFMAX(ast2->sample_size, 1),
1846  flags |
1849  if (index < 0)
1850  index = 0;
1851  ast2->seek_pos = st2->index_entries[index].pos;
1852  pos_min = FFMIN(pos_min,ast2->seek_pos);
1853  }
1854  for (i = 0; i < s->nb_streams; i++) {
1855  AVStream *st2 = s->streams[i];
1856  AVIStream *ast2 = st2->priv_data;
1857 
1858  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1859  continue;
1860 
1861  index = av_index_search_timestamp(
1862  st2,
1863  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1865  if (index < 0)
1866  index = 0;
1867  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1868  index--;
1869  ast2->frame_offset = st2->index_entries[index].timestamp;
1870  }
1871 
1872  /* do the seek */
1873  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1874  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1875  return -1;
1876  }
1877  avi->stream_index = -1;
1878  avi->dts_max = INT_MIN;
1879  return 0;
1880 }
1881 
1883 {
1884  int i;
1885  AVIContext *avi = s->priv_data;
1886 
1887  for (i = 0; i < s->nb_streams; i++) {
1888  AVStream *st = s->streams[i];
1889  AVIStream *ast = st->priv_data;
1890  if (ast) {
1891  if (ast->sub_ctx) {
1892  av_freep(&ast->sub_ctx->pb);
1894  }
1895  av_freep(&ast->sub_buffer);
1896  av_free_packet(&ast->sub_pkt);
1897  }
1898  }
1899 
1900  av_freep(&avi->dv_demux);
1901 
1902  return 0;
1903 }
1904 
1905 static int avi_probe(AVProbeData *p)
1906 {
1907  int i;
1908 
1909  /* check file header */
1910  for (i = 0; avi_headers[i][0]; i++)
1911  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1912  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1913  return AVPROBE_SCORE_MAX;
1914 
1915  return 0;
1916 }
1917 
1919  .name = "avi",
1920  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1921  .priv_data_size = sizeof(AVIContext),
1922  .extensions = "avi",
1923  .read_probe = avi_probe,
1928  .priv_class = &demuxer_class,
1929 };
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:221
static AVStream * get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt)
Definition: avidec.c:1106
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2266
#define ff_tlog(ctx,...)
Definition: internal.h:60
#define NULL
Definition: coverity.c:32
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:776
uint32_t handler
Definition: avidec.c:48
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
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:282
uint32_t pal[256]
Definition: avidec.c:57
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:280
AVOption.
Definition: opt.h:255
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
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:1742
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2770
AVFormatContext * sub_ctx
Definition: avidec.c:62
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:127
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:128
#define MAX_ODML_DEPTH
Definition: avidec.c:84
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1447
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:402
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:4071
int64_t pos
Definition: avformat.h:784
int ff_get_extradata(AVCodecContext *avctx, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:2942
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2268
int64_t last_pkt_pos
Definition: avidec.c:76
uint32_t rate
Definition: avidec.c:50
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:914
int dshow_block_align
Definition: avidec.c:59
int num
numerator
Definition: rational.h:44
int index
stream index in AVFormatContext
Definition: avformat.h:843
int size
Definition: avcodec.h:1423
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:204
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:462
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1046
int is_odml
Definition: avidec.c:78
enum AVMediaType codec_type
Definition: rtp.c:37
int64_t movi_end
Definition: avidec.c:72
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
uint32_t scale
Definition: avidec.c:49
static int get_duration(AVIStream *ast, int len)
Definition: avidec.c:128
void * priv_data
Definition: avformat.h:862
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:277
#define AVIIF_INDEX
Definition: avi.h:36
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:3051
discard all
Definition: avcodec.h:688
static AVPacket pkt
EXIF metadata parser.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
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.
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2298
static int check_stream_max_drift(AVFormatContext *s)
Definition: avidec.c:1612
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:112
Format I/O context.
Definition: avformat.h:1272
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1385
Public dictionary API.
int stream_index
Definition: avidec.c:80
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
if()
Definition: avfilter.c:975
uint8_t
static int nb_streams
Definition: ffprobe.c:226
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:203
AVOptions.
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1882
attribute_deprecated void(* destruct)(struct AVPacket *)
Definition: avcodec.h:1443
int64_t riff_end
Definition: avidec.c:71
const AVCodecTag ff_codec_movvideo_tags[]
Definition: isom.c:71
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:690
#define AVPALETTE_SIZE
Definition: pixfmt.h:33
int use_odml
Definition: avidec.c:83
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
enum AVStreamParseType need_parsing
Definition: avformat.h:1035
int id
Format-specific stream ID.
Definition: avformat.h:849
int64_t movi_list
Definition: avidec.c:75
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1616
static void handler(vbi_event *ev, void *user_data)
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3737
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1340
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:111
static void clean_index(AVFormatContext *s)
Definition: avidec.c:271
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:80
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:39
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1383
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:328
uint8_t * data
Definition: avcodec.h:1422
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:187
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
Definition: avidec.c:1041
uint32_t tag
Definition: movenc.c:1333
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:241
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
static const uint8_t header[24]
Definition: sdr2.c:67
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2997
static int64_t duration
Definition: ffplay.c:325
#define av_log(a,...)
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:538
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1468
int packet_size
Definition: avidec.c:46
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:140
#define U(x)
Definition: vp56_arith.h:37
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AVINDEX_KEYFRAME
Definition: avformat.h:791
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:112
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
Read BITMAPINFOHEADER structure and set AVStream codec width, height and bits_per_encoded_sample fiel...
Definition: riffdec.c:203
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1482
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1841
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2900
av_default_item_name
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:659
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
int remaining
Definition: avidec.c:45
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:785
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
Definition: avidec.c:163
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:425
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1405
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
Definition: avidec.c:299
simple assert() macros that are a bit more flexible than ISO C assert().
static int get_stream_idx(const unsigned *d)
Definition: avidec.c:1140
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:925
#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:224
#define fail()
Definition: checkasm.h:55
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1428
Only parse headers, do not repack.
Definition: avformat.h:775
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:529
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
struct AVStream::@152 * info
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1328
int prefix_count
Definition: avidec.c:56
int non_interleaved
Definition: avidec.c:79
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:160
int bit_rate
the average bitrate
Definition: avcodec.h:1566
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:127
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
#define FFMIN(a, b)
Definition: common.h:66
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
Definition: dv.c:441
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:213
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:78
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
ret
Definition: avfilter.c:974
int64_t cum_len
Definition: avidec.c:54
int width
picture width / height.
Definition: avcodec.h:1680
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:470
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
static struct @197 state
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static const char months[12][4]
Definition: avidec.c:323
#define FFABS(a)
Definition: common.h:61
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
Definition: avidec.c:1754
#define AVFMT_FLAG_SORT_DTS
try to interleave outputted packets by dts (using this flag can slow demuxing down) ...
Definition: avformat.h:1402
int n
Definition: avisynth_c.h:547
AVDictionary * metadata
Definition: avformat.h:916
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:107
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:644
static int calculate_bitrate(AVFormatContext *s)
Definition: avidec.c:426
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
Stream structure.
Definition: avformat.h:842
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static const char avi_headers[][8]
Definition: avidec.c:103
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avidec.c:1302
int prefix
Definition: avidec.c:55
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
enum AVMediaType codec_type
Definition: avcodec.h:1509
static int resync(AVIOContext *pb)
Definition: gifdec.c:81
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, uint8_t *buf, int buf_size, int64_t pos)
Definition: dv.c:368
enum AVCodecID codec_id
Definition: avcodec.h:1518
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
int index_loaded
Definition: avidec.c:77
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1533
int avpriv_exif_decode_ifd(AVCodecContext *avctx, GetByteContext *gbytes, int le, int depth, AVDictionary **metadata)
Recursively decodes all IFD's and adds included TAGS into the metadata dictionary.
Definition: exif.c:122
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: avformat.h:985
int extradata_size
Definition: avcodec.h:1617
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:69
int nb_index_entries
Definition: avformat.h:1048
static const AVOption options[]
Definition: avidec.c:89
Describe the class of an AVClass context structure.
Definition: log.h:67
static int avi_read_idx1(AVFormatContext *s, int size)
Definition: avidec.c:1531
int index
Definition: gxfenc.c:89
rational number numerator/denominator
Definition: rational.h:43
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:286
byte swapping routines
discard useless packets like 0 size packets in avi
Definition: avcodec.h:683
#define snprintf
Definition: snprintf.h:34
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:458
static int avi_probe(AVProbeData *p)
Definition: avidec.c:1905
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int size, int big_endian)
Definition: riffdec.c:86
int error
contains the error code or 0 if no error happened
Definition: avio.h:145
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
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:2219
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:454
static int avi_extract_stream_metadata(AVStream *st)
Definition: avidec.c:388
int64_t seek_pos
Definition: avidec.c:66
int ff_copy_whitelists(AVFormatContext *dst, AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:137
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:133
static int flags
Definition: cpu.c:47
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1707
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1918
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:901
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
int64_t io_fsize
Definition: avidec.c:74
A reference to a data buffer.
Definition: buffer.h:81
static const AVClass demuxer_class
Definition: avidec.c:94
full parsing and repack
Definition: avformat.h:774
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:643
Main libavformat public API header.
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
Definition: avidec.c:345
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
Definition: avidec.c:326
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:79
common internal api header.
AVPacket sub_pkt
Definition: avidec.c:63
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:894
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1509
static int get_riff(AVFormatContext *s, AVIOContext *pb)
Definition: avidec.c:138
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:903
int den
denominator
Definition: rational.h:45
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
Definition: dv.c:351
int sample_size
Definition: avidec.c:51
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:3709
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:635
#define av_free(p)
char * value
Definition: dict.h:88
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
int len
int has_pal
Definition: avidec.c:58
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1667
void * priv_data
Format private data.
Definition: avformat.h:1300
#define print_tag(str, tag, size)
Definition: avidec.c:120
int64_t frame_offset
Definition: avidec.c:43
int64_t dts_max
Definition: avidec.c:85
int64_t fsize
Definition: avidec.c:73
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1421
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:228
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1764
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1367
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:301
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:299
int stream_index
Definition: avcodec.h:1424
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:884
#define MKTAG(a, b, c, d)
Definition: common.h:315
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:907
int odml_depth
Definition: avidec.c:82
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1081
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1399
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:667
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:1154
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:252
GLuint buffer
Definition: opengl_enc.c:102
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
const char * name
Definition: opengl_enc.c:103
uint8_t * sub_buffer
Definition: avidec.c:64
DVDemuxContext * dv_demux
Definition: avidec.c:81