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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_BOOL, {.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  int64_t pos;
484  int ret;
485  AVDictionaryEntry *dict_entry;
486 
487  avi->stream_index = -1;
488 
489  ret = get_riff(s, pb);
490  if (ret < 0)
491  return ret;
492 
493  av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
494 
495  avi->io_fsize = avi->fsize = avio_size(pb);
496  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
497  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
498 
499  /* first list tag */
500  stream_index = -1;
501  codec_type = -1;
502  frame_period = 0;
503  for (;;) {
504  if (avio_feof(pb))
505  goto fail;
506  tag = avio_rl32(pb);
507  size = avio_rl32(pb);
508 
509  print_tag("tag", tag, size);
510 
511  switch (tag) {
512  case MKTAG('L', 'I', 'S', 'T'):
513  list_end = avio_tell(pb) + size;
514  /* Ignored, except at start of video packets. */
515  tag1 = avio_rl32(pb);
516 
517  print_tag("list", tag1, 0);
518 
519  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
520  avi->movi_list = avio_tell(pb) - 4;
521  if (size)
522  avi->movi_end = avi->movi_list + size + (size & 1);
523  else
524  avi->movi_end = avi->fsize;
525  av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
526  goto end_of_header;
527  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
528  ff_read_riff_info(s, size - 4);
529  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
530  avi_read_nikon(s, list_end);
531 
532  break;
533  case MKTAG('I', 'D', 'I', 'T'):
534  {
535  unsigned char date[64] = { 0 };
536  size += (size & 1);
537  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
538  avio_skip(pb, size);
540  break;
541  }
542  case MKTAG('d', 'm', 'l', 'h'):
543  avi->is_odml = 1;
544  avio_skip(pb, size + (size & 1));
545  break;
546  case MKTAG('a', 'm', 'v', 'h'):
547  amv_file_format = 1;
548  case MKTAG('a', 'v', 'i', 'h'):
549  /* AVI header */
550  /* using frame_period is bad idea */
551  frame_period = avio_rl32(pb);
552  avio_rl32(pb); /* max. bytes per second */
553  avio_rl32(pb);
555 
556  avio_skip(pb, 2 * 4);
557  avio_rl32(pb);
558  avio_rl32(pb);
559  avih_width = avio_rl32(pb);
560  avih_height = avio_rl32(pb);
561 
562  avio_skip(pb, size - 10 * 4);
563  break;
564  case MKTAG('s', 't', 'r', 'h'):
565  /* stream header */
566 
567  tag1 = avio_rl32(pb);
568  handler = avio_rl32(pb); /* codec tag */
569 
570  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
571  avio_skip(pb, size - 8);
572  break;
573  } else {
574  stream_index++;
575  st = avformat_new_stream(s, NULL);
576  if (!st)
577  goto fail;
578 
579  st->id = stream_index;
580  ast = av_mallocz(sizeof(AVIStream));
581  if (!ast)
582  goto fail;
583  st->priv_data = ast;
584  }
585  if (amv_file_format)
586  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
587  : MKTAG('v', 'i', 'd', 's');
588 
589  print_tag("strh", tag1, -1);
590 
591  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
592  tag1 == MKTAG('i', 'v', 'a', 's')) {
593  int64_t dv_dur;
594 
595  /* After some consideration -- I don't think we
596  * have to support anything but DV in type1 AVIs. */
597  if (s->nb_streams != 1)
598  goto fail;
599 
600  if (handler != MKTAG('d', 'v', 's', 'd') &&
601  handler != MKTAG('d', 'v', 'h', 'd') &&
602  handler != MKTAG('d', 'v', 's', 'l'))
603  goto fail;
604 
605  ast = s->streams[0]->priv_data;
606  av_freep(&s->streams[0]->codec->extradata);
607  av_freep(&s->streams[0]->codec);
608  if (s->streams[0]->info)
610  av_freep(&s->streams[0]->info);
611  av_freep(&s->streams[0]);
612  s->nb_streams = 0;
613  if (CONFIG_DV_DEMUXER) {
614  avi->dv_demux = avpriv_dv_init_demux(s);
615  if (!avi->dv_demux)
616  goto fail;
617  } else
618  goto fail;
619  s->streams[0]->priv_data = ast;
620  avio_skip(pb, 3 * 4);
621  ast->scale = avio_rl32(pb);
622  ast->rate = avio_rl32(pb);
623  avio_skip(pb, 4); /* start time */
624 
625  dv_dur = avio_rl32(pb);
626  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
627  dv_dur *= AV_TIME_BASE;
628  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
629  }
630  /* else, leave duration alone; timing estimation in utils.c
631  * will make a guess based on bitrate. */
632 
633  stream_index = s->nb_streams - 1;
634  avio_skip(pb, size - 9 * 4);
635  break;
636  }
637 
638  av_assert0(stream_index < s->nb_streams);
639  ast->handler = handler;
640 
641  avio_rl32(pb); /* flags */
642  avio_rl16(pb); /* priority */
643  avio_rl16(pb); /* language */
644  avio_rl32(pb); /* initial frame */
645  ast->scale = avio_rl32(pb);
646  ast->rate = avio_rl32(pb);
647  if (!(ast->scale && ast->rate)) {
649  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
650  "(This file has been generated by broken software.)\n",
651  ast->scale,
652  ast->rate);
653  if (frame_period) {
654  ast->rate = 1000000;
655  ast->scale = frame_period;
656  } else {
657  ast->rate = 25;
658  ast->scale = 1;
659  }
660  }
661  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
662 
663  ast->cum_len = avio_rl32(pb); /* start */
664  st->nb_frames = avio_rl32(pb);
665 
666  st->start_time = 0;
667  avio_rl32(pb); /* buffer size */
668  avio_rl32(pb); /* quality */
669  if (ast->cum_len*ast->scale/ast->rate > 3600) {
670  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
671  ast->cum_len = 0;
672  }
673  ast->sample_size = avio_rl32(pb); /* sample ssize */
674  ast->cum_len *= FFMAX(1, ast->sample_size);
675  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
676  ast->rate, ast->scale, ast->sample_size);
677 
678  switch (tag1) {
679  case MKTAG('v', 'i', 'd', 's'):
680  codec_type = AVMEDIA_TYPE_VIDEO;
681 
682  ast->sample_size = 0;
683  st->avg_frame_rate = av_inv_q(st->time_base);
684  break;
685  case MKTAG('a', 'u', 'd', 's'):
686  codec_type = AVMEDIA_TYPE_AUDIO;
687  break;
688  case MKTAG('t', 'x', 't', 's'):
689  codec_type = AVMEDIA_TYPE_SUBTITLE;
690  break;
691  case MKTAG('d', 'a', 't', 's'):
692  codec_type = AVMEDIA_TYPE_DATA;
693  break;
694  default:
695  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
696  }
697 
698  if (ast->sample_size < 0) {
699  if (s->error_recognition & AV_EF_EXPLODE) {
700  av_log(s, AV_LOG_ERROR,
701  "Invalid sample_size %d at stream %d\n",
702  ast->sample_size,
703  stream_index);
704  goto fail;
705  }
707  "Invalid sample_size %d at stream %d "
708  "setting it to 0\n",
709  ast->sample_size,
710  stream_index);
711  ast->sample_size = 0;
712  }
713 
714  if (ast->sample_size == 0) {
715  st->duration = st->nb_frames;
716  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
717  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
718  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
719  }
720  }
721  ast->frame_offset = ast->cum_len;
722  avio_skip(pb, size - 12 * 4);
723  break;
724  case MKTAG('s', 't', 'r', 'f'):
725  /* stream header */
726  if (!size)
727  break;
728  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
729  avio_skip(pb, size);
730  } else {
731  uint64_t cur_pos = avio_tell(pb);
732  unsigned esize;
733  if (cur_pos < list_end)
734  size = FFMIN(size, list_end - cur_pos);
735  st = s->streams[stream_index];
736  if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
737  avio_skip(pb, size);
738  break;
739  }
740  switch (codec_type) {
741  case AVMEDIA_TYPE_VIDEO:
742  if (amv_file_format) {
743  st->codec->width = avih_width;
744  st->codec->height = avih_height;
747  avio_skip(pb, size);
748  break;
749  }
750  tag1 = ff_get_bmp_header(pb, st, &esize);
751 
752  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
753  tag1 == MKTAG('D', 'X', 'S', 'A')) {
755  st->codec->codec_tag = tag1;
757  break;
758  }
759 
760  if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
761  if (esize == size-1 && (esize&1)) {
762  st->codec->extradata_size = esize - 10 * 4;
763  } else
764  st->codec->extradata_size = size - 10 * 4;
765  if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
766  return AVERROR(ENOMEM);
767  }
768 
769  // FIXME: check if the encoder really did this correctly
770  if (st->codec->extradata_size & 1)
771  avio_r8(pb);
772 
773  /* Extract palette from extradata if bpp <= 8.
774  * This code assumes that extradata contains only palette.
775  * This is true for all paletted codecs implemented in
776  * FFmpeg. */
777  if (st->codec->extradata_size &&
778  (st->codec->bits_per_coded_sample <= 8)) {
779  int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
780  const uint8_t *pal_src;
781 
782  pal_size = FFMIN(pal_size, st->codec->extradata_size);
783  pal_src = st->codec->extradata +
784  st->codec->extradata_size - pal_size;
785  /* Exclude the "BottomUp" field from the palette */
786  if (pal_src - st->codec->extradata >= 9 &&
787  !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
788  pal_src -= 9;
789  for (i = 0; i < pal_size / 4; i++)
790  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
791  ast->has_pal = 1;
792  }
793 
794  print_tag("video", tag1, 0);
795 
797  st->codec->codec_tag = tag1;
799  tag1);
800  /* If codec is not found yet, try with the mov tags. */
801  if (!st->codec->codec_id) {
802  char tag_buf[32];
803  av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1);
804  st->codec->codec_id =
806  if (st->codec->codec_id)
808  "mov tag found in avi (fourcc %s)\n",
809  tag_buf);
810  }
811  /* This is needed to get the pict type which is necessary
812  * for generating correct pts. */
814 
815  if (st->codec->codec_id == AV_CODEC_ID_MPEG4 &&
816  ast->handler == MKTAG('X', 'V', 'I', 'D'))
817  st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D');
818 
819  if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
821  if (st->codec->codec_id == AV_CODEC_ID_RV40)
823 
824  if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
825  st->codec->extradata_size < 1U << 30) {
826  st->codec->extradata_size += 9;
827  if ((ret = av_reallocp(&st->codec->extradata,
828  st->codec->extradata_size +
830  st->codec->extradata_size = 0;
831  return ret;
832  } else
833  memcpy(st->codec->extradata + st->codec->extradata_size - 9,
834  "BottomUp", 9);
835  }
836  st->codec->height = FFABS(st->codec->height);
837 
838 // avio_skip(pb, size - 5 * 4);
839  break;
840  case AVMEDIA_TYPE_AUDIO:
841  ret = ff_get_wav_header(s, pb, st->codec, size, 0);
842  if (ret < 0)
843  return ret;
844  ast->dshow_block_align = st->codec->block_align;
845  if (ast->sample_size && st->codec->block_align &&
846  ast->sample_size != st->codec->block_align) {
847  av_log(s,
849  "sample size (%d) != block align (%d)\n",
850  ast->sample_size,
851  st->codec->block_align);
852  ast->sample_size = st->codec->block_align;
853  }
854  /* 2-aligned
855  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
856  if (size & 1)
857  avio_skip(pb, 1);
858  /* Force parsing as several audio frames can be in
859  * one packet and timestamps refer to packet start. */
861  /* ADTS header is in extradata, AAC without header must be
862  * stored as exact frames. Parser not needed and it will
863  * fail. */
864  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
865  st->codec->extradata_size)
867  // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
868  if (st->codec->codec_id == AV_CODEC_ID_FLAC)
870  /* AVI files with Xan DPCM audio (wrongly) declare PCM
871  * audio in the header but have Axan as stream_code_tag. */
872  if (ast->handler == AV_RL32("Axan")) {
874  st->codec->codec_tag = 0;
875  ast->dshow_block_align = 0;
876  }
877  if (amv_file_format) {
879  ast->dshow_block_align = 0;
880  }
881  if ((st->codec->codec_id == AV_CODEC_ID_AAC ||
882  st->codec->codec_id == AV_CODEC_ID_FLAC ||
883  st->codec->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
884  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
885  ast->dshow_block_align = 0;
886  }
887  if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
888  st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
889  st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
890  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
891  ast->sample_size = 0;
892  }
893  break;
896  st->request_probe= 1;
897  avio_skip(pb, size);
898  break;
899  default:
902  st->codec->codec_tag = 0;
903  avio_skip(pb, size);
904  break;
905  }
906  }
907  break;
908  case MKTAG('s', 't', 'r', 'd'):
909  if (stream_index >= (unsigned)s->nb_streams
910  || s->streams[stream_index]->codec->extradata_size
911  || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
912  avio_skip(pb, size);
913  } else {
914  uint64_t cur_pos = avio_tell(pb);
915  if (cur_pos < list_end)
916  size = FFMIN(size, list_end - cur_pos);
917  st = s->streams[stream_index];
918 
919  if (size<(1<<30)) {
920  if (ff_get_extradata(st->codec, pb, size) < 0)
921  return AVERROR(ENOMEM);
922  }
923 
924  if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
925  avio_r8(pb);
926 
927  ret = avi_extract_stream_metadata(st);
928  if (ret < 0) {
929  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
930  }
931  }
932  break;
933  case MKTAG('i', 'n', 'd', 'x'):
934  pos = avio_tell(pb);
935  if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
936  avi->use_odml &&
937  read_braindead_odml_indx(s, 0) < 0 &&
939  goto fail;
940  avio_seek(pb, pos + size, SEEK_SET);
941  break;
942  case MKTAG('v', 'p', 'r', 'p'):
943  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
944  AVRational active, active_aspect;
945 
946  st = s->streams[stream_index];
947  avio_rl32(pb);
948  avio_rl32(pb);
949  avio_rl32(pb);
950  avio_rl32(pb);
951  avio_rl32(pb);
952 
953  active_aspect.den = avio_rl16(pb);
954  active_aspect.num = avio_rl16(pb);
955  active.num = avio_rl32(pb);
956  active.den = avio_rl32(pb);
957  avio_rl32(pb); // nbFieldsPerFrame
958 
959  if (active_aspect.num && active_aspect.den &&
960  active.num && active.den) {
961  st->sample_aspect_ratio = av_div_q(active_aspect, active);
962  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
963  active_aspect.num, active_aspect.den,
964  active.num, active.den);
965  }
966  size -= 9 * 4;
967  }
968  avio_skip(pb, size);
969  break;
970  case MKTAG('s', 't', 'r', 'n'):
971  if (s->nb_streams) {
972  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
973  if (ret < 0)
974  return ret;
975  break;
976  }
977  default:
978  if (size > 1000000) {
979  av_log(s, AV_LOG_ERROR,
980  "Something went wrong during header parsing, "
981  "I will ignore it and try to continue anyway.\n");
983  goto fail;
984  avi->movi_list = avio_tell(pb) - 4;
985  avi->movi_end = avi->fsize;
986  goto end_of_header;
987  }
988  /* skip tag */
989  size += (size & 1);
990  avio_skip(pb, size);
991  break;
992  }
993  }
994 
995 end_of_header:
996  /* check stream number */
997  if (stream_index != s->nb_streams - 1) {
998 
999 fail:
1000  return AVERROR_INVALIDDATA;
1001  }
1002 
1003  if (!avi->index_loaded && pb->seekable)
1004  avi_load_index(s);
1005  calculate_bitrate(s);
1006  avi->index_loaded |= 1;
1007 
1008  if ((ret = guess_ni_flag(s)) < 0)
1009  return ret;
1010 
1011  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1012 
1013  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1014  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1015  for (i = 0; i < s->nb_streams; i++) {
1016  AVStream *st = s->streams[i];
1020  }
1021 
1022  for (i = 0; i < s->nb_streams; i++) {
1023  AVStream *st = s->streams[i];
1024  if (st->nb_index_entries)
1025  break;
1026  }
1027  // DV-in-AVI cannot be non-interleaved, if set this must be
1028  // a mis-detection.
1029  if (avi->dv_demux)
1030  avi->non_interleaved = 0;
1031  if (i == s->nb_streams && avi->non_interleaved) {
1033  "Non-interleaved AVI without index, switching to interleaved\n");
1034  avi->non_interleaved = 0;
1035  }
1036 
1037  if (avi->non_interleaved) {
1038  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1039  clean_index(s);
1040  }
1041 
1042  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1044 
1045  return 0;
1046 }
1047 
1049 {
1050  if (pkt->size >= 7 &&
1051  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1052  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1053  uint8_t desc[256];
1054  int score = AVPROBE_SCORE_EXTENSION, ret;
1055  AVIStream *ast = st->priv_data;
1056  AVInputFormat *sub_demuxer;
1057  AVRational time_base;
1058  int size;
1059  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1060  pkt->size - 7,
1061  0, NULL, NULL, NULL, NULL);
1062  AVProbeData pd;
1063  unsigned int desc_len = avio_rl32(pb);
1064 
1065  if (desc_len > pb->buf_end - pb->buf_ptr)
1066  goto error;
1067 
1068  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1069  avio_skip(pb, desc_len - ret);
1070  if (*desc)
1071  av_dict_set(&st->metadata, "title", desc, 0);
1072 
1073  avio_rl16(pb); /* flags? */
1074  avio_rl32(pb); /* data size */
1075 
1076  size = pb->buf_end - pb->buf_ptr;
1077  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1078  .buf_size = size };
1079  if (!pd.buf)
1080  goto error;
1081  memcpy(pd.buf, pb->buf_ptr, size);
1082  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1083  av_freep(&pd.buf);
1084  if (!sub_demuxer)
1085  goto error;
1086 
1087  if (!(ast->sub_ctx = avformat_alloc_context()))
1088  goto error;
1089 
1090  ast->sub_ctx->pb = pb;
1091 
1092  if (ff_copy_whitelists(ast->sub_ctx, s) < 0)
1093  goto error;
1094 
1095  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1096  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1097  *st->codec = *ast->sub_ctx->streams[0]->codec;
1098  ast->sub_ctx->streams[0]->codec->extradata = NULL;
1099  time_base = ast->sub_ctx->streams[0]->time_base;
1100  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1101  }
1102  ast->sub_buffer = pkt->data;
1103  memset(pkt, 0, sizeof(*pkt));
1104  return 1;
1105 
1106 error:
1107  av_freep(&ast->sub_ctx);
1108  av_freep(&pb);
1109  }
1110  return 0;
1111 }
1112 
1114  AVPacket *pkt)
1115 {
1116  AVIStream *ast, *next_ast = next_st->priv_data;
1117  int64_t ts, next_ts, ts_min = INT64_MAX;
1118  AVStream *st, *sub_st = NULL;
1119  int i;
1120 
1121  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1122  AV_TIME_BASE_Q);
1123 
1124  for (i = 0; i < s->nb_streams; i++) {
1125  st = s->streams[i];
1126  ast = st->priv_data;
1127  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1128  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1129  if (ts <= next_ts && ts < ts_min) {
1130  ts_min = ts;
1131  sub_st = st;
1132  }
1133  }
1134  }
1135 
1136  if (sub_st) {
1137  ast = sub_st->priv_data;
1138  *pkt = ast->sub_pkt;
1139  pkt->stream_index = sub_st->index;
1140 
1141  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1142  ast->sub_pkt.data = NULL;
1143  }
1144  return sub_st;
1145 }
1146 
1147 static int get_stream_idx(const unsigned *d)
1148 {
1149  if (d[0] >= '0' && d[0] <= '9' &&
1150  d[1] >= '0' && d[1] <= '9') {
1151  return (d[0] - '0') * 10 + (d[1] - '0');
1152  } else {
1153  return 100; // invalid stream ID
1154  }
1155 }
1156 
1157 /**
1158  *
1159  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1160  */
1161 static int avi_sync(AVFormatContext *s, int exit_early)
1162 {
1163  AVIContext *avi = s->priv_data;
1164  AVIOContext *pb = s->pb;
1165  int n;
1166  unsigned int d[8];
1167  unsigned int size;
1168  int64_t i, sync;
1169 
1170 start_sync:
1171  memset(d, -1, sizeof(d));
1172  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1173  int j;
1174 
1175  for (j = 0; j < 7; j++)
1176  d[j] = d[j + 1];
1177  d[7] = avio_r8(pb);
1178 
1179  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1180 
1181  n = get_stream_idx(d + 2);
1182  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1183  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1184  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1185  continue;
1186 
1187  // parse ix##
1188  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1189  // parse JUNK
1190  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1191  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1192  avio_skip(pb, size);
1193  goto start_sync;
1194  }
1195 
1196  // parse stray LIST
1197  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1198  avio_skip(pb, 4);
1199  goto start_sync;
1200  }
1201 
1202  n = get_stream_idx(d);
1203 
1204  if (!((i - avi->last_pkt_pos) & 1) &&
1205  get_stream_idx(d + 1) < s->nb_streams)
1206  continue;
1207 
1208  // detect ##ix chunk and skip
1209  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1210  avio_skip(pb, size);
1211  goto start_sync;
1212  }
1213 
1214  if (avi->dv_demux && n != 0)
1215  continue;
1216 
1217  // parse ##dc/##wb
1218  if (n < s->nb_streams) {
1219  AVStream *st;
1220  AVIStream *ast;
1221  st = s->streams[n];
1222  ast = st->priv_data;
1223 
1224  if (!ast) {
1225  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1226  continue;
1227  }
1228 
1229  if (s->nb_streams >= 2) {
1230  AVStream *st1 = s->streams[1];
1231  AVIStream *ast1 = st1->priv_data;
1232  // workaround for broken small-file-bug402.avi
1233  if ( d[2] == 'w' && d[3] == 'b'
1234  && n == 0
1235  && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1236  && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1237  && ast->prefix == 'd'*256+'c'
1238  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1239  ) {
1240  n = 1;
1241  st = st1;
1242  ast = ast1;
1244  "Invalid stream + prefix combination, assuming audio.\n");
1245  }
1246  }
1247 
1248  if (!avi->dv_demux &&
1249  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1250  // FIXME: needs a little reordering
1251  (st->discard >= AVDISCARD_NONKEY &&
1252  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1253  || st->discard >= AVDISCARD_ALL)) {
1254  if (!exit_early) {
1255  ast->frame_offset += get_duration(ast, size);
1256  avio_skip(pb, size);
1257  goto start_sync;
1258  }
1259  }
1260 
1261  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1262  int k = avio_r8(pb);
1263  int last = (k + avio_r8(pb) - 1) & 0xFF;
1264 
1265  avio_rl16(pb); // flags
1266 
1267  // b + (g << 8) + (r << 16);
1268  for (; k <= last; k++)
1269  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1270 
1271  ast->has_pal = 1;
1272  goto start_sync;
1273  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1274  d[2] < 128 && d[3] < 128) ||
1275  d[2] * 256 + d[3] == ast->prefix /* ||
1276  (d[2] == 'd' && d[3] == 'c') ||
1277  (d[2] == 'w' && d[3] == 'b') */) {
1278  if (exit_early)
1279  return 0;
1280  if (d[2] * 256 + d[3] == ast->prefix)
1281  ast->prefix_count++;
1282  else {
1283  ast->prefix = d[2] * 256 + d[3];
1284  ast->prefix_count = 0;
1285  }
1286 
1287  avi->stream_index = n;
1288  ast->packet_size = size + 8;
1289  ast->remaining = size;
1290 
1291  if (size) {
1292  uint64_t pos = avio_tell(pb) - 8;
1293  if (!st->index_entries || !st->nb_index_entries ||
1294  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1295  av_add_index_entry(st, pos, ast->frame_offset, size,
1296  0, AVINDEX_KEYFRAME);
1297  }
1298  }
1299  return 0;
1300  }
1301  }
1302  }
1303 
1304  if (pb->error)
1305  return pb->error;
1306  return AVERROR_EOF;
1307 }
1308 
1310 {
1311  AVIContext *avi = s->priv_data;
1312  int best_stream_index = 0;
1313  AVStream *best_st = NULL;
1314  AVIStream *best_ast;
1315  int64_t best_ts = INT64_MAX;
1316  int i;
1317 
1318  for (i = 0; i < s->nb_streams; i++) {
1319  AVStream *st = s->streams[i];
1320  AVIStream *ast = st->priv_data;
1321  int64_t ts = ast->frame_offset;
1322  int64_t last_ts;
1323 
1324  if (!st->nb_index_entries)
1325  continue;
1326 
1327  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1328  if (!ast->remaining && ts > last_ts)
1329  continue;
1330 
1331  ts = av_rescale_q(ts, st->time_base,
1332  (AVRational) { FFMAX(1, ast->sample_size),
1333  AV_TIME_BASE });
1334 
1335  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1336  st->time_base.num, st->time_base.den, ast->frame_offset);
1337  if (ts < best_ts) {
1338  best_ts = ts;
1339  best_st = st;
1340  best_stream_index = i;
1341  }
1342  }
1343  if (!best_st)
1344  return AVERROR_EOF;
1345 
1346  best_ast = best_st->priv_data;
1347  best_ts = best_ast->frame_offset;
1348  if (best_ast->remaining) {
1349  i = av_index_search_timestamp(best_st,
1350  best_ts,
1351  AVSEEK_FLAG_ANY |
1353  } else {
1354  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1355  if (i >= 0)
1356  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1357  }
1358 
1359  if (i >= 0) {
1360  int64_t pos = best_st->index_entries[i].pos;
1361  pos += best_ast->packet_size - best_ast->remaining;
1362  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1363  return AVERROR_EOF;
1364 
1365  av_assert0(best_ast->remaining <= best_ast->packet_size);
1366 
1367  avi->stream_index = best_stream_index;
1368  if (!best_ast->remaining)
1369  best_ast->packet_size =
1370  best_ast->remaining = best_st->index_entries[i].size;
1371  }
1372  else
1373  return AVERROR_EOF;
1374 
1375  return 0;
1376 }
1377 
1379 {
1380  AVIContext *avi = s->priv_data;
1381  AVIOContext *pb = s->pb;
1382  int err;
1383 
1384  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1385  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1386  if (size >= 0)
1387  return size;
1388  else
1389  goto resync;
1390  }
1391 
1392  if (avi->non_interleaved) {
1393  err = ni_prepare_read(s);
1394  if (err < 0)
1395  return err;
1396  }
1397 
1398 resync:
1399  if (avi->stream_index >= 0) {
1400  AVStream *st = s->streams[avi->stream_index];
1401  AVIStream *ast = st->priv_data;
1402  int size, err;
1403 
1404  if (get_subtitle_pkt(s, st, pkt))
1405  return 0;
1406 
1407  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1408  if (ast->sample_size <= 1)
1409  size = INT_MAX;
1410  else if (ast->sample_size < 32)
1411  // arbitrary multiplier to avoid tiny packets for raw PCM data
1412  size = 1024 * ast->sample_size;
1413  else
1414  size = ast->sample_size;
1415 
1416  if (size > ast->remaining)
1417  size = ast->remaining;
1418  avi->last_pkt_pos = avio_tell(pb);
1419  err = av_get_packet(pb, pkt, size);
1420  if (err < 0)
1421  return err;
1422  size = err;
1423 
1424  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1425  uint8_t *pal;
1426  pal = av_packet_new_side_data(pkt,
1428  AVPALETTE_SIZE);
1429  if (!pal) {
1430  av_log(s, AV_LOG_ERROR,
1431  "Failed to allocate data for palette\n");
1432  } else {
1433  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1434  ast->has_pal = 0;
1435  }
1436  }
1437 
1438  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1439  AVBufferRef *avbuf = pkt->buf;
1440  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1441  pkt->data, pkt->size, pkt->pos);
1442  pkt->buf = avbuf;
1443  pkt->flags |= AV_PKT_FLAG_KEY;
1444  if (size < 0)
1445  av_packet_unref(pkt);
1446  } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1447  !st->codec->codec_tag && read_gab2_sub(s, st, pkt)) {
1448  ast->frame_offset++;
1449  avi->stream_index = -1;
1450  ast->remaining = 0;
1451  goto resync;
1452  } else {
1453  /* XXX: How to handle B-frames in AVI? */
1454  pkt->dts = ast->frame_offset;
1455 // pkt->dts += ast->start;
1456  if (ast->sample_size)
1457  pkt->dts /= ast->sample_size;
1458  av_log(s, AV_LOG_TRACE,
1459  "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1460  "base:%d st:%d size:%d\n",
1461  pkt->dts,
1462  ast->frame_offset,
1463  ast->scale,
1464  ast->rate,
1465  ast->sample_size,
1466  AV_TIME_BASE,
1467  avi->stream_index,
1468  size);
1469  pkt->stream_index = avi->stream_index;
1470 
1471  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1472  AVIndexEntry *e;
1473  int index;
1474 
1476  e = &st->index_entries[index];
1477 
1478  if (index >= 0 && e->timestamp == ast->frame_offset) {
1479  if (index == st->nb_index_entries-1) {
1480  int key=1;
1481  uint32_t state=-1;
1482  if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1483  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1484  while (ptr < end) {
1485  ptr = avpriv_find_start_code(ptr, end, &state);
1486  if (state == 0x1B6 && ptr < end) {
1487  key = !(*ptr & 0xC0);
1488  break;
1489  }
1490  }
1491  }
1492  if (!key)
1493  e->flags &= ~AVINDEX_KEYFRAME;
1494  }
1495  if (e->flags & AVINDEX_KEYFRAME)
1496  pkt->flags |= AV_PKT_FLAG_KEY;
1497  }
1498  } else {
1499  pkt->flags |= AV_PKT_FLAG_KEY;
1500  }
1501  ast->frame_offset += get_duration(ast, pkt->size);
1502  }
1503  ast->remaining -= err;
1504  if (!ast->remaining) {
1505  avi->stream_index = -1;
1506  ast->packet_size = 0;
1507  }
1508 
1509  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1510  av_packet_unref(pkt);
1511  goto resync;
1512  }
1513  ast->seek_pos= 0;
1514 
1515  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1516  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1517 
1518  if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1519  avi->non_interleaved= 1;
1520  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1521  }else if (avi->dts_max < dts)
1522  avi->dts_max = dts;
1523  }
1524 
1525  return 0;
1526  }
1527 
1528  if ((err = avi_sync(s, 0)) < 0)
1529  return err;
1530  goto resync;
1531 }
1532 
1533 /* XXX: We make the implicit supposition that the positions are sorted
1534  * for each stream. */
1536 {
1537  AVIContext *avi = s->priv_data;
1538  AVIOContext *pb = s->pb;
1539  int nb_index_entries, i;
1540  AVStream *st;
1541  AVIStream *ast;
1542  int64_t pos;
1543  unsigned int index, tag, flags, len, first_packet = 1;
1544  int64_t last_pos = -1;
1545  unsigned last_idx = -1;
1546  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1547  int anykey = 0;
1548 
1549  nb_index_entries = size / 16;
1550  if (nb_index_entries <= 0)
1551  return AVERROR_INVALIDDATA;
1552 
1553  idx1_pos = avio_tell(pb);
1554  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1555  if (avi_sync(s, 1) == 0)
1556  first_packet_pos = avio_tell(pb) - 8;
1557  avi->stream_index = -1;
1558  avio_seek(pb, idx1_pos, SEEK_SET);
1559 
1560  if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1561  first_packet_pos = 0;
1562  data_offset = avi->movi_list;
1563  }
1564 
1565  /* Read the entries and sort them in each stream component. */
1566  for (i = 0; i < nb_index_entries; i++) {
1567  if (avio_feof(pb))
1568  return -1;
1569 
1570  tag = avio_rl32(pb);
1571  flags = avio_rl32(pb);
1572  pos = avio_rl32(pb);
1573  len = avio_rl32(pb);
1574  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1575  i, tag, flags, pos, len);
1576 
1577  index = ((tag & 0xff) - '0') * 10;
1578  index += (tag >> 8 & 0xff) - '0';
1579  if (index >= s->nb_streams)
1580  continue;
1581  st = s->streams[index];
1582  ast = st->priv_data;
1583 
1584  if (first_packet && first_packet_pos) {
1585  if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1586  data_offset = first_packet_pos - pos;
1587  first_packet = 0;
1588  }
1589  pos += data_offset;
1590 
1591  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1592 
1593  // even if we have only a single stream, we should
1594  // switch to non-interleaved to get correct timestamps
1595  if (last_pos == pos)
1596  avi->non_interleaved = 1;
1597  if (last_idx != pos && len) {
1598  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1599  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1600  last_idx= pos;
1601  }
1602  ast->cum_len += get_duration(ast, len);
1603  last_pos = pos;
1604  anykey |= flags&AVIIF_INDEX;
1605  }
1606  if (!anykey) {
1607  for (index = 0; index < s->nb_streams; index++) {
1608  st = s->streams[index];
1609  if (st->nb_index_entries)
1611  }
1612  }
1613  return 0;
1614 }
1615 
1616 /* Scan the index and consider any file with streams more than
1617  * 2 seconds or 64MB apart non-interleaved. */
1619 {
1620  int64_t min_pos, pos;
1621  int i;
1622  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1623  if (!idx)
1624  return AVERROR(ENOMEM);
1625  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1626  int64_t max_dts = INT64_MIN / 2;
1627  int64_t min_dts = INT64_MAX / 2;
1628  int64_t max_buffer = 0;
1629 
1630  min_pos = INT64_MAX;
1631 
1632  for (i = 0; i < s->nb_streams; i++) {
1633  AVStream *st = s->streams[i];
1634  AVIStream *ast = st->priv_data;
1635  int n = st->nb_index_entries;
1636  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1637  idx[i]++;
1638  if (idx[i] < n) {
1639  int64_t dts;
1640  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1641  FFMAX(ast->sample_size, 1),
1642  st->time_base, AV_TIME_BASE_Q);
1643  min_dts = FFMIN(min_dts, dts);
1644  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1645  }
1646  }
1647  for (i = 0; i < s->nb_streams; i++) {
1648  AVStream *st = s->streams[i];
1649  AVIStream *ast = st->priv_data;
1650 
1651  if (idx[i] && min_dts != INT64_MAX / 2) {
1652  int64_t dts;
1653  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1654  FFMAX(ast->sample_size, 1),
1655  st->time_base, AV_TIME_BASE_Q);
1656  max_dts = FFMAX(max_dts, dts);
1657  max_buffer = FFMAX(max_buffer,
1658  av_rescale(dts - min_dts,
1659  st->codec->bit_rate,
1660  AV_TIME_BASE));
1661  }
1662  }
1663  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1664  max_buffer > 1024 * 1024 * 8 * 8) {
1665  av_free(idx);
1666  return 1;
1667  }
1668  }
1669  av_free(idx);
1670  return 0;
1671 }
1672 
1674 {
1675  int i;
1676  int64_t last_start = 0;
1677  int64_t first_end = INT64_MAX;
1678  int64_t oldpos = avio_tell(s->pb);
1679 
1680  for (i = 0; i < s->nb_streams; i++) {
1681  AVStream *st = s->streams[i];
1682  int n = st->nb_index_entries;
1683  unsigned int size;
1684 
1685  if (n <= 0)
1686  continue;
1687 
1688  if (n >= 2) {
1689  int64_t pos = st->index_entries[0].pos;
1690  unsigned tag[2];
1691  avio_seek(s->pb, pos, SEEK_SET);
1692  tag[0] = avio_r8(s->pb);
1693  tag[1] = avio_r8(s->pb);
1694  avio_rl16(s->pb);
1695  size = avio_rl32(s->pb);
1696  if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1697  last_start = INT64_MAX;
1698  }
1699 
1700  if (st->index_entries[0].pos > last_start)
1701  last_start = st->index_entries[0].pos;
1702  if (st->index_entries[n - 1].pos < first_end)
1703  first_end = st->index_entries[n - 1].pos;
1704  }
1705  avio_seek(s->pb, oldpos, SEEK_SET);
1706 
1707  if (last_start > first_end)
1708  return 1;
1709 
1710  return check_stream_max_drift(s);
1711 }
1712 
1714 {
1715  AVIContext *avi = s->priv_data;
1716  AVIOContext *pb = s->pb;
1717  uint32_t tag, size;
1718  int64_t pos = avio_tell(pb);
1719  int64_t next;
1720  int ret = -1;
1721 
1722  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1723  goto the_end; // maybe truncated file
1724  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1725  for (;;) {
1726  tag = avio_rl32(pb);
1727  size = avio_rl32(pb);
1728  if (avio_feof(pb))
1729  break;
1730  next = avio_tell(pb) + size + (size & 1);
1731 
1732  av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n",
1733  tag & 0xff,
1734  (tag >> 8) & 0xff,
1735  (tag >> 16) & 0xff,
1736  (tag >> 24) & 0xff,
1737  size);
1738 
1739  if (tag == MKTAG('i', 'd', 'x', '1') &&
1740  avi_read_idx1(s, size) >= 0) {
1741  avi->index_loaded=2;
1742  ret = 0;
1743  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1744  uint32_t tag1 = avio_rl32(pb);
1745 
1746  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1747  ff_read_riff_info(s, size - 4);
1748  }else if (!ret)
1749  break;
1750 
1751  if (avio_seek(pb, next, SEEK_SET) < 0)
1752  break; // something is wrong here
1753  }
1754 
1755 the_end:
1756  avio_seek(pb, pos, SEEK_SET);
1757  return ret;
1758 }
1759 
1760 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1761 {
1762  AVIStream *ast2 = st2->priv_data;
1763  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1764  av_packet_unref(&ast2->sub_pkt);
1765  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1766  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1767  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1768 }
1769 
1770 static int avi_read_seek(AVFormatContext *s, int stream_index,
1771  int64_t timestamp, int flags)
1772 {
1773  AVIContext *avi = s->priv_data;
1774  AVStream *st;
1775  int i, index;
1776  int64_t pos, pos_min;
1777  AVIStream *ast;
1778 
1779  /* Does not matter which stream is requested dv in avi has the
1780  * stream information in the first video stream.
1781  */
1782  if (avi->dv_demux)
1783  stream_index = 0;
1784 
1785  if (!avi->index_loaded) {
1786  /* we only load the index on demand */
1787  avi_load_index(s);
1788  avi->index_loaded |= 1;
1789  }
1790  av_assert0(stream_index >= 0);
1791 
1792  st = s->streams[stream_index];
1793  ast = st->priv_data;
1794  index = av_index_search_timestamp(st,
1795  timestamp * FFMAX(ast->sample_size, 1),
1796  flags);
1797  if (index < 0) {
1798  if (st->nb_index_entries > 0)
1799  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1800  timestamp * FFMAX(ast->sample_size, 1),
1801  st->index_entries[0].timestamp,
1803  return AVERROR_INVALIDDATA;
1804  }
1805 
1806  /* find the position */
1807  pos = st->index_entries[index].pos;
1808  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1809 
1810  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1811  timestamp, index, st->index_entries[index].timestamp);
1812 
1813  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1814  /* One and only one real stream for DV in AVI, and it has video */
1815  /* offsets. Calling with other stream indexes should have failed */
1816  /* the av_index_search_timestamp call above. */
1817 
1818  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1819  return -1;
1820 
1821  /* Feed the DV video stream version of the timestamp to the */
1822  /* DV demux so it can synthesize correct timestamps. */
1823  ff_dv_offset_reset(avi->dv_demux, timestamp);
1824 
1825  avi->stream_index = -1;
1826  return 0;
1827  }
1828 
1829  pos_min = pos;
1830  for (i = 0; i < s->nb_streams; i++) {
1831  AVStream *st2 = s->streams[i];
1832  AVIStream *ast2 = st2->priv_data;
1833 
1834  ast2->packet_size =
1835  ast2->remaining = 0;
1836 
1837  if (ast2->sub_ctx) {
1838  seek_subtitle(st, st2, timestamp);
1839  continue;
1840  }
1841 
1842  if (st2->nb_index_entries <= 0)
1843  continue;
1844 
1845 // av_assert1(st2->codec->block_align);
1846  av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
1847  index = av_index_search_timestamp(st2,
1848  av_rescale_q(timestamp,
1849  st->time_base,
1850  st2->time_base) *
1851  FFMAX(ast2->sample_size, 1),
1852  flags |
1855  if (index < 0)
1856  index = 0;
1857  ast2->seek_pos = st2->index_entries[index].pos;
1858  pos_min = FFMIN(pos_min,ast2->seek_pos);
1859  }
1860  for (i = 0; i < s->nb_streams; i++) {
1861  AVStream *st2 = s->streams[i];
1862  AVIStream *ast2 = st2->priv_data;
1863 
1864  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1865  continue;
1866 
1867  index = av_index_search_timestamp(
1868  st2,
1869  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1871  if (index < 0)
1872  index = 0;
1873  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1874  index--;
1875  ast2->frame_offset = st2->index_entries[index].timestamp;
1876  }
1877 
1878  /* do the seek */
1879  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1880  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1881  return -1;
1882  }
1883  avi->stream_index = -1;
1884  avi->dts_max = INT_MIN;
1885  return 0;
1886 }
1887 
1889 {
1890  int i;
1891  AVIContext *avi = s->priv_data;
1892 
1893  for (i = 0; i < s->nb_streams; i++) {
1894  AVStream *st = s->streams[i];
1895  AVIStream *ast = st->priv_data;
1896  if (ast) {
1897  if (ast->sub_ctx) {
1898  av_freep(&ast->sub_ctx->pb);
1900  }
1901  av_freep(&ast->sub_buffer);
1902  av_packet_unref(&ast->sub_pkt);
1903  }
1904  }
1905 
1906  av_freep(&avi->dv_demux);
1907 
1908  return 0;
1909 }
1910 
1911 static int avi_probe(AVProbeData *p)
1912 {
1913  int i;
1914 
1915  /* check file header */
1916  for (i = 0; avi_headers[i][0]; i++)
1917  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1918  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1919  return AVPROBE_SCORE_MAX;
1920 
1921  return 0;
1922 }
1923 
1925  .name = "avi",
1926  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1927  .priv_data_size = sizeof(AVIContext),
1928  .extensions = "avi",
1929  .read_probe = avi_probe,
1934  .priv_class = &demuxer_class,
1935 };
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:226
static AVStream * get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt)
Definition: avidec.c:1113
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2314
#define ff_tlog(ctx,...)
Definition: internal.h:65
#define NULL
Definition: coverity.c:32
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:809
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:287
uint32_t pal[256]
Definition: avidec.c:57
AVOption.
Definition: opt.h:245
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:1776
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2819
AVFormatContext * sub_ctx
Definition: avidec.c:62
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1597
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:174
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:175
#define MAX_ODML_DEPTH
Definition: avidec.c:84
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1487
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:4147
int64_t pos
Definition: avformat.h:817
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:2998
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2316
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:949
int dshow_block_align
Definition: avidec.c:59
int num
numerator
Definition: rational.h:44
int index
stream index in AVFormatContext
Definition: avformat.h:878
int size
Definition: avcodec.h:1468
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:208
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:474
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1080
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:897
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:282
#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:2669
discard all
Definition: avcodec.h:688
static AVPacket pkt
static int ni_prepare_read(AVFormatContext *s)
Definition: avidec.c:1309
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:2324
static int check_stream_max_drift(AVFormatContext *s)
Definition: avidec.c:1618
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:112
Format I/O context.
Definition: avformat.h:1314
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:1427
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.
uint8_t
static int nb_streams
Definition: ffprobe.c:240
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:195
AVOptions.
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1888
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:698
#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:1069
int id
Format-specific stream ID.
Definition: avformat.h:884
int64_t movi_list
Definition: avidec.c:75
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1647
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:3803
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1382
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:1425
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:328
uint8_t * data
Definition: avcodec.h:1467
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
Definition: avidec.c:1048
uint32_t tag
Definition: movenc.c:1348
#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:248
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:442
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:2917
#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:545
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1499
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:142
#define U(x)
Definition: vp56_arith.h:37
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AVINDEX_KEYFRAME
Definition: avformat.h:824
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:116
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:208
#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:1528
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1875
av_default_item_name
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:667
#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:818
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
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:420
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1450
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:1147
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:960
#define FFMAX(a, b)
Definition: common.h:94
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:241
#define fail()
Definition: checkasm.h:79
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1473
Only parse headers, do not repack.
Definition: avformat.h:808
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:536
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1370
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:207
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:129
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:246
#define FFMIN(a, b)
Definition: common.h:96
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
int64_t cum_len
Definition: avidec.c:54
int width
picture width / height.
Definition: avcodec.h:1711
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:470
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
int64_t duration
Definition: movenc-test.c:63
static const char months[12][4]
Definition: avidec.c:323
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
Definition: avidec.c:1760
#define AVFMT_FLAG_SORT_DTS
try to interleave outputted packets by dts (using this flag can slow demuxing down) ...
Definition: avformat.h:1444
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2822
int n
Definition: avisynth_c.h:547
AVDictionary * metadata
Definition: avformat.h:951
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:192
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:106
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:670
static int calculate_bitrate(AVFormatContext *s)
Definition: avidec.c:426
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
Stream structure.
Definition: avformat.h:877
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:1378
int prefix
Definition: avidec.c:55
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
enum AVMediaType codec_type
Definition: avcodec.h:1540
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:1549
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:252
AVIOContext * pb
I/O context.
Definition: avformat.h:1356
static int resync(AVFormatContext *s)
Definition: flvdec.c:813
int index_loaded
Definition: avidec.c:77
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:545
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1564
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:1020
int extradata_size
Definition: avcodec.h:1648
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:1082
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:1535
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:276
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:470
static int avi_probe(AVProbeData *p)
Definition: avidec.c:1911
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int size, int big_endian)
Definition: riffdec.c:88
int error
contains the error code or 0 if no error happened
Definition: avio.h:192
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
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:2256
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:501
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:140
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:1713
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1924
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:936
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
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:807
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:651
Main libavformat public API header.
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
Definition: avidec.c:345
struct AVStream::@158 * info
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
Definition: avidec.c:326
common internal api header.
AVPacket sub_pkt
Definition: avidec.c:63
if(ret< 0)
Definition: vf_mcdeint.c:282
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:929
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:187
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1555
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:938
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:3775
#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
int len
int has_pal
Definition: avidec.c:58
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1673
void * priv_data
Format private data.
Definition: avformat.h:1342
#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
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:420
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:1466
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1770
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1409
static struct @205 state
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:306
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:1469
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:919
#define MKTAG(a, b, c, d)
Definition: common.h:342
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:942
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:1115
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1444
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:675
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:1161
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