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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 && !avio_feof(s->pb)) {
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 && !avio_feof(s->pb)) {
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->codecpar->extradata;
392  int data_size = st->codecpar->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(s, &gb, 1, 0, &st->metadata);
412  break;
413  case MKTAG('C', 'A', 'S', 'I'):
414  avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
415  break;
416  case MKTAG('Z', 'o', 'r', 'a'):
417  avpriv_request_sample(s, "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->codecpar->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->codecpar->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;
607  av_freep(&s->streams[0]->codecpar);
608 #if FF_API_LAVF_AVCTX
610  av_freep(&s->streams[0]->codec);
612 #endif
613  if (s->streams[0]->info)
615  av_freep(&s->streams[0]->info);
616  if (s->streams[0]->internal)
617  av_freep(&s->streams[0]->internal->avctx);
618  av_freep(&s->streams[0]->internal);
619  av_freep(&s->streams[0]);
620  s->nb_streams = 0;
621  if (CONFIG_DV_DEMUXER) {
622  avi->dv_demux = avpriv_dv_init_demux(s);
623  if (!avi->dv_demux)
624  goto fail;
625  } else
626  goto fail;
627  s->streams[0]->priv_data = ast;
628  avio_skip(pb, 3 * 4);
629  ast->scale = avio_rl32(pb);
630  ast->rate = avio_rl32(pb);
631  avio_skip(pb, 4); /* start time */
632 
633  dv_dur = avio_rl32(pb);
634  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
635  dv_dur *= AV_TIME_BASE;
636  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
637  }
638  /* else, leave duration alone; timing estimation in utils.c
639  * will make a guess based on bitrate. */
640 
641  stream_index = s->nb_streams - 1;
642  avio_skip(pb, size - 9 * 4);
643  break;
644  }
645 
646  av_assert0(stream_index < s->nb_streams);
647  ast->handler = handler;
648 
649  avio_rl32(pb); /* flags */
650  avio_rl16(pb); /* priority */
651  avio_rl16(pb); /* language */
652  avio_rl32(pb); /* initial frame */
653  ast->scale = avio_rl32(pb);
654  ast->rate = avio_rl32(pb);
655  if (!(ast->scale && ast->rate)) {
657  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
658  "(This file has been generated by broken software.)\n",
659  ast->scale,
660  ast->rate);
661  if (frame_period) {
662  ast->rate = 1000000;
663  ast->scale = frame_period;
664  } else {
665  ast->rate = 25;
666  ast->scale = 1;
667  }
668  }
669  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
670 
671  ast->cum_len = avio_rl32(pb); /* start */
672  st->nb_frames = avio_rl32(pb);
673 
674  st->start_time = 0;
675  avio_rl32(pb); /* buffer size */
676  avio_rl32(pb); /* quality */
677  if (ast->cum_len*ast->scale/ast->rate > 3600) {
678  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
679  ast->cum_len = 0;
680  }
681  ast->sample_size = avio_rl32(pb);
682  ast->cum_len *= FFMAX(1, ast->sample_size);
683  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
684  ast->rate, ast->scale, ast->sample_size);
685 
686  switch (tag1) {
687  case MKTAG('v', 'i', 'd', 's'):
688  codec_type = AVMEDIA_TYPE_VIDEO;
689 
690  ast->sample_size = 0;
691  st->avg_frame_rate = av_inv_q(st->time_base);
692  break;
693  case MKTAG('a', 'u', 'd', 's'):
694  codec_type = AVMEDIA_TYPE_AUDIO;
695  break;
696  case MKTAG('t', 'x', 't', 's'):
697  codec_type = AVMEDIA_TYPE_SUBTITLE;
698  break;
699  case MKTAG('d', 'a', 't', 's'):
700  codec_type = AVMEDIA_TYPE_DATA;
701  break;
702  default:
703  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
704  }
705 
706  if (ast->sample_size < 0) {
707  if (s->error_recognition & AV_EF_EXPLODE) {
708  av_log(s, AV_LOG_ERROR,
709  "Invalid sample_size %d at stream %d\n",
710  ast->sample_size,
711  stream_index);
712  goto fail;
713  }
715  "Invalid sample_size %d at stream %d "
716  "setting it to 0\n",
717  ast->sample_size,
718  stream_index);
719  ast->sample_size = 0;
720  }
721 
722  if (ast->sample_size == 0) {
723  st->duration = st->nb_frames;
724  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
725  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
726  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
727  }
728  }
729  ast->frame_offset = ast->cum_len;
730  avio_skip(pb, size - 12 * 4);
731  break;
732  case MKTAG('s', 't', 'r', 'f'):
733  /* stream header */
734  if (!size)
735  break;
736  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
737  avio_skip(pb, size);
738  } else {
739  uint64_t cur_pos = avio_tell(pb);
740  unsigned esize;
741  if (cur_pos < list_end)
742  size = FFMIN(size, list_end - cur_pos);
743  st = s->streams[stream_index];
745  avio_skip(pb, size);
746  break;
747  }
748  switch (codec_type) {
749  case AVMEDIA_TYPE_VIDEO:
750  if (amv_file_format) {
751  st->codecpar->width = avih_width;
752  st->codecpar->height = avih_height;
755  avio_skip(pb, size);
756  break;
757  }
758  tag1 = ff_get_bmp_header(pb, st, &esize);
759 
760  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
761  tag1 == MKTAG('D', 'X', 'S', 'A')) {
763  st->codecpar->codec_tag = tag1;
765  break;
766  }
767 
768  if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
769  if (esize == size-1 && (esize&1)) {
770  st->codecpar->extradata_size = esize - 10 * 4;
771  } else
772  st->codecpar->extradata_size = size - 10 * 4;
773  if (st->codecpar->extradata) {
774  av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
775  av_freep(&st->codecpar->extradata);
776  }
777  if (ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size) < 0)
778  return AVERROR(ENOMEM);
779  }
780 
781  // FIXME: check if the encoder really did this correctly
782  if (st->codecpar->extradata_size & 1)
783  avio_r8(pb);
784 
785  /* Extract palette from extradata if bpp <= 8.
786  * This code assumes that extradata contains only palette.
787  * This is true for all paletted codecs implemented in
788  * FFmpeg. */
789  if (st->codecpar->extradata_size &&
790  (st->codecpar->bits_per_coded_sample <= 8)) {
791  int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
792  const uint8_t *pal_src;
793 
794  pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
795  pal_src = st->codecpar->extradata +
796  st->codecpar->extradata_size - pal_size;
797  /* Exclude the "BottomUp" field from the palette */
798  if (pal_src - st->codecpar->extradata >= 9 &&
799  !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
800  pal_src -= 9;
801  for (i = 0; i < pal_size / 4; i++)
802  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
803  ast->has_pal = 1;
804  }
805 
806  print_tag("video", tag1, 0);
807 
809  st->codecpar->codec_tag = tag1;
811  tag1);
812  /* If codec is not found yet, try with the mov tags. */
813  if (!st->codecpar->codec_id) {
814  char tag_buf[32];
815  av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1);
816  st->codecpar->codec_id =
818  if (st->codecpar->codec_id)
820  "mov tag found in avi (fourcc %s)\n",
821  tag_buf);
822  }
823  /* This is needed to get the pict type which is necessary
824  * for generating correct pts. */
826 
827  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
828  ast->handler == MKTAG('X', 'V', 'I', 'D'))
829  st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
830 
831  if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
833  if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
835 
836  if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
837  st->codecpar->extradata_size < 1U << 30) {
838  st->codecpar->extradata_size += 9;
839  if ((ret = av_reallocp(&st->codecpar->extradata,
840  st->codecpar->extradata_size +
842  st->codecpar->extradata_size = 0;
843  return ret;
844  } else
845  memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
846  "BottomUp", 9);
847  }
848  st->codecpar->height = FFABS(st->codecpar->height);
849 
850 // avio_skip(pb, size - 5 * 4);
851  break;
852  case AVMEDIA_TYPE_AUDIO:
853  ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
854  if (ret < 0)
855  return ret;
857  if (ast->sample_size && st->codecpar->block_align &&
858  ast->sample_size != st->codecpar->block_align) {
859  av_log(s,
861  "sample size (%d) != block align (%d)\n",
862  ast->sample_size,
863  st->codecpar->block_align);
864  ast->sample_size = st->codecpar->block_align;
865  }
866  /* 2-aligned
867  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
868  if (size & 1)
869  avio_skip(pb, 1);
870  /* Force parsing as several audio frames can be in
871  * one packet and timestamps refer to packet start. */
873  /* ADTS header is in extradata, AAC without header must be
874  * stored as exact frames. Parser not needed and it will
875  * fail. */
876  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
879  // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
880  if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
882  /* AVI files with Xan DPCM audio (wrongly) declare PCM
883  * audio in the header but have Axan as stream_code_tag. */
884  if (ast->handler == AV_RL32("Axan")) {
886  st->codecpar->codec_tag = 0;
887  ast->dshow_block_align = 0;
888  }
889  if (amv_file_format) {
891  ast->dshow_block_align = 0;
892  }
893  if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
895  st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
896  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
897  ast->dshow_block_align = 0;
898  }
899  if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
900  st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
901  st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
902  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
903  ast->sample_size = 0;
904  }
905  break;
908  st->request_probe= 1;
909  avio_skip(pb, size);
910  break;
911  default:
914  st->codecpar->codec_tag = 0;
915  avio_skip(pb, size);
916  break;
917  }
918  }
919  break;
920  case MKTAG('s', 't', 'r', 'd'):
921  if (stream_index >= (unsigned)s->nb_streams
922  || s->streams[stream_index]->codecpar->extradata_size
923  || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
924  avio_skip(pb, size);
925  } else {
926  uint64_t cur_pos = avio_tell(pb);
927  if (cur_pos < list_end)
928  size = FFMIN(size, list_end - cur_pos);
929  st = s->streams[stream_index];
930 
931  if (size<(1<<30)) {
932  if (st->codecpar->extradata) {
933  av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
934  av_freep(&st->codecpar->extradata);
935  }
936  if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
937  return AVERROR(ENOMEM);
938  }
939 
940  if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
941  avio_r8(pb);
942 
943  ret = avi_extract_stream_metadata(s, st);
944  if (ret < 0) {
945  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
946  }
947  }
948  break;
949  case MKTAG('i', 'n', 'd', 'x'):
950  pos = avio_tell(pb);
951  if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
952  avi->use_odml &&
953  read_braindead_odml_indx(s, 0) < 0 &&
955  goto fail;
956  avio_seek(pb, pos + size, SEEK_SET);
957  break;
958  case MKTAG('v', 'p', 'r', 'p'):
959  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
960  AVRational active, active_aspect;
961 
962  st = s->streams[stream_index];
963  avio_rl32(pb);
964  avio_rl32(pb);
965  avio_rl32(pb);
966  avio_rl32(pb);
967  avio_rl32(pb);
968 
969  active_aspect.den = avio_rl16(pb);
970  active_aspect.num = avio_rl16(pb);
971  active.num = avio_rl32(pb);
972  active.den = avio_rl32(pb);
973  avio_rl32(pb); // nbFieldsPerFrame
974 
975  if (active_aspect.num && active_aspect.den &&
976  active.num && active.den) {
977  st->sample_aspect_ratio = av_div_q(active_aspect, active);
978  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
979  active_aspect.num, active_aspect.den,
980  active.num, active.den);
981  }
982  size -= 9 * 4;
983  }
984  avio_skip(pb, size);
985  break;
986  case MKTAG('s', 't', 'r', 'n'):
987  if (s->nb_streams) {
988  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
989  if (ret < 0)
990  return ret;
991  break;
992  }
993  default:
994  if (size > 1000000) {
995  char tag_buf[32];
996  av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag);
997  av_log(s, AV_LOG_ERROR,
998  "Something went wrong during header parsing, "
999  "tag %s has size %u, "
1000  "I will ignore it and try to continue anyway.\n",
1001  tag_buf, size);
1003  goto fail;
1004  avi->movi_list = avio_tell(pb) - 4;
1005  avi->movi_end = avi->fsize;
1006  goto end_of_header;
1007  }
1008  /* Do not fail for very large idx1 tags */
1009  case MKTAG('i', 'd', 'x', '1'):
1010  /* skip tag */
1011  size += (size & 1);
1012  avio_skip(pb, size);
1013  break;
1014  }
1015  }
1016 
1017 end_of_header:
1018  /* check stream number */
1019  if (stream_index != s->nb_streams - 1) {
1020 
1021 fail:
1022  return AVERROR_INVALIDDATA;
1023  }
1024 
1025  if (!avi->index_loaded && pb->seekable)
1026  avi_load_index(s);
1027  calculate_bitrate(s);
1028  avi->index_loaded |= 1;
1029 
1030  if ((ret = guess_ni_flag(s)) < 0)
1031  return ret;
1032 
1033  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1034 
1035  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1036  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1037  for (i = 0; i < s->nb_streams; i++) {
1038  AVStream *st = s->streams[i];
1042  }
1043 
1044  for (i = 0; i < s->nb_streams; i++) {
1045  AVStream *st = s->streams[i];
1046  if (st->nb_index_entries)
1047  break;
1048  }
1049  // DV-in-AVI cannot be non-interleaved, if set this must be
1050  // a mis-detection.
1051  if (avi->dv_demux)
1052  avi->non_interleaved = 0;
1053  if (i == s->nb_streams && avi->non_interleaved) {
1055  "Non-interleaved AVI without index, switching to interleaved\n");
1056  avi->non_interleaved = 0;
1057  }
1058 
1059  if (avi->non_interleaved) {
1060  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1061  clean_index(s);
1062  }
1063 
1064  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1066 
1067  return 0;
1068 }
1069 
1071 {
1072  if (pkt->size >= 7 &&
1073  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1074  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1075  uint8_t desc[256];
1076  int score = AVPROBE_SCORE_EXTENSION, ret;
1077  AVIStream *ast = st->priv_data;
1078  AVInputFormat *sub_demuxer;
1079  AVRational time_base;
1080  int size;
1081  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1082  pkt->size - 7,
1083  0, NULL, NULL, NULL, NULL);
1084  AVProbeData pd;
1085  unsigned int desc_len = avio_rl32(pb);
1086 
1087  if (desc_len > pb->buf_end - pb->buf_ptr)
1088  goto error;
1089 
1090  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1091  avio_skip(pb, desc_len - ret);
1092  if (*desc)
1093  av_dict_set(&st->metadata, "title", desc, 0);
1094 
1095  avio_rl16(pb); /* flags? */
1096  avio_rl32(pb); /* data size */
1097 
1098  size = pb->buf_end - pb->buf_ptr;
1099  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1100  .buf_size = size };
1101  if (!pd.buf)
1102  goto error;
1103  memcpy(pd.buf, pb->buf_ptr, size);
1104  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1105  av_freep(&pd.buf);
1106  if (!sub_demuxer)
1107  goto error;
1108 
1109  if (!(ast->sub_ctx = avformat_alloc_context()))
1110  goto error;
1111 
1112  ast->sub_ctx->pb = pb;
1113 
1114  if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1115  goto error;
1116 
1117  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1118  if (ast->sub_ctx->nb_streams != 1)
1119  goto error;
1120  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1122  time_base = ast->sub_ctx->streams[0]->time_base;
1123  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1124  }
1125  ast->sub_buffer = pkt->data;
1126  memset(pkt, 0, sizeof(*pkt));
1127  return 1;
1128 
1129 error:
1130  av_freep(&ast->sub_ctx);
1131  av_freep(&pb);
1132  }
1133  return 0;
1134 }
1135 
1137  AVPacket *pkt)
1138 {
1139  AVIStream *ast, *next_ast = next_st->priv_data;
1140  int64_t ts, next_ts, ts_min = INT64_MAX;
1141  AVStream *st, *sub_st = NULL;
1142  int i;
1143 
1144  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1145  AV_TIME_BASE_Q);
1146 
1147  for (i = 0; i < s->nb_streams; i++) {
1148  st = s->streams[i];
1149  ast = st->priv_data;
1150  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1151  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1152  if (ts <= next_ts && ts < ts_min) {
1153  ts_min = ts;
1154  sub_st = st;
1155  }
1156  }
1157  }
1158 
1159  if (sub_st) {
1160  ast = sub_st->priv_data;
1161  *pkt = ast->sub_pkt;
1162  pkt->stream_index = sub_st->index;
1163 
1164  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1165  ast->sub_pkt.data = NULL;
1166  }
1167  return sub_st;
1168 }
1169 
1170 static int get_stream_idx(const unsigned *d)
1171 {
1172  if (d[0] >= '0' && d[0] <= '9' &&
1173  d[1] >= '0' && d[1] <= '9') {
1174  return (d[0] - '0') * 10 + (d[1] - '0');
1175  } else {
1176  return 100; // invalid stream ID
1177  }
1178 }
1179 
1180 /**
1181  *
1182  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1183  */
1184 static int avi_sync(AVFormatContext *s, int exit_early)
1185 {
1186  AVIContext *avi = s->priv_data;
1187  AVIOContext *pb = s->pb;
1188  int n;
1189  unsigned int d[8];
1190  unsigned int size;
1191  int64_t i, sync;
1192 
1193 start_sync:
1194  memset(d, -1, sizeof(d));
1195  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1196  int j;
1197 
1198  for (j = 0; j < 7; j++)
1199  d[j] = d[j + 1];
1200  d[7] = avio_r8(pb);
1201 
1202  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1203 
1204  n = get_stream_idx(d + 2);
1205  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1206  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1207  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1208  continue;
1209 
1210  // parse ix##
1211  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1212  // parse JUNK
1213  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1214  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1215  avio_skip(pb, size);
1216  goto start_sync;
1217  }
1218 
1219  // parse stray LIST
1220  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1221  avio_skip(pb, 4);
1222  goto start_sync;
1223  }
1224 
1225  n = get_stream_idx(d);
1226 
1227  if (!((i - avi->last_pkt_pos) & 1) &&
1228  get_stream_idx(d + 1) < s->nb_streams)
1229  continue;
1230 
1231  // detect ##ix chunk and skip
1232  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1233  avio_skip(pb, size);
1234  goto start_sync;
1235  }
1236 
1237  if (avi->dv_demux && n != 0)
1238  continue;
1239 
1240  // parse ##dc/##wb
1241  if (n < s->nb_streams) {
1242  AVStream *st;
1243  AVIStream *ast;
1244  st = s->streams[n];
1245  ast = st->priv_data;
1246 
1247  if (!ast) {
1248  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1249  continue;
1250  }
1251 
1252  if (s->nb_streams >= 2) {
1253  AVStream *st1 = s->streams[1];
1254  AVIStream *ast1 = st1->priv_data;
1255  // workaround for broken small-file-bug402.avi
1256  if ( d[2] == 'w' && d[3] == 'b'
1257  && n == 0
1258  && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1260  && ast->prefix == 'd'*256+'c'
1261  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1262  ) {
1263  n = 1;
1264  st = st1;
1265  ast = ast1;
1267  "Invalid stream + prefix combination, assuming audio.\n");
1268  }
1269  }
1270 
1271  if (!avi->dv_demux &&
1272  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1273  // FIXME: needs a little reordering
1274  (st->discard >= AVDISCARD_NONKEY &&
1275  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1276  || st->discard >= AVDISCARD_ALL)) {
1277  if (!exit_early) {
1278  ast->frame_offset += get_duration(ast, size);
1279  avio_skip(pb, size);
1280  goto start_sync;
1281  }
1282  }
1283 
1284  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1285  int k = avio_r8(pb);
1286  int last = (k + avio_r8(pb) - 1) & 0xFF;
1287 
1288  avio_rl16(pb); // flags
1289 
1290  // b + (g << 8) + (r << 16);
1291  for (; k <= last; k++)
1292  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1293 
1294  ast->has_pal = 1;
1295  goto start_sync;
1296  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1297  d[2] < 128 && d[3] < 128) ||
1298  d[2] * 256 + d[3] == ast->prefix /* ||
1299  (d[2] == 'd' && d[3] == 'c') ||
1300  (d[2] == 'w' && d[3] == 'b') */) {
1301  if (exit_early)
1302  return 0;
1303  if (d[2] * 256 + d[3] == ast->prefix)
1304  ast->prefix_count++;
1305  else {
1306  ast->prefix = d[2] * 256 + d[3];
1307  ast->prefix_count = 0;
1308  }
1309 
1310  avi->stream_index = n;
1311  ast->packet_size = size + 8;
1312  ast->remaining = size;
1313 
1314  if (size) {
1315  uint64_t pos = avio_tell(pb) - 8;
1316  if (!st->index_entries || !st->nb_index_entries ||
1317  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1318  av_add_index_entry(st, pos, ast->frame_offset, size,
1319  0, AVINDEX_KEYFRAME);
1320  }
1321  }
1322  return 0;
1323  }
1324  }
1325  }
1326 
1327  if (pb->error)
1328  return pb->error;
1329  return AVERROR_EOF;
1330 }
1331 
1333 {
1334  AVIContext *avi = s->priv_data;
1335  int best_stream_index = 0;
1336  AVStream *best_st = NULL;
1337  AVIStream *best_ast;
1338  int64_t best_ts = INT64_MAX;
1339  int i;
1340 
1341  for (i = 0; i < s->nb_streams; i++) {
1342  AVStream *st = s->streams[i];
1343  AVIStream *ast = st->priv_data;
1344  int64_t ts = ast->frame_offset;
1345  int64_t last_ts;
1346 
1347  if (!st->nb_index_entries)
1348  continue;
1349 
1350  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1351  if (!ast->remaining && ts > last_ts)
1352  continue;
1353 
1354  ts = av_rescale_q(ts, st->time_base,
1355  (AVRational) { FFMAX(1, ast->sample_size),
1356  AV_TIME_BASE });
1357 
1358  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1359  st->time_base.num, st->time_base.den, ast->frame_offset);
1360  if (ts < best_ts) {
1361  best_ts = ts;
1362  best_st = st;
1363  best_stream_index = i;
1364  }
1365  }
1366  if (!best_st)
1367  return AVERROR_EOF;
1368 
1369  best_ast = best_st->priv_data;
1370  best_ts = best_ast->frame_offset;
1371  if (best_ast->remaining) {
1372  i = av_index_search_timestamp(best_st,
1373  best_ts,
1374  AVSEEK_FLAG_ANY |
1376  } else {
1377  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1378  if (i >= 0)
1379  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1380  }
1381 
1382  if (i >= 0) {
1383  int64_t pos = best_st->index_entries[i].pos;
1384  pos += best_ast->packet_size - best_ast->remaining;
1385  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1386  return AVERROR_EOF;
1387 
1388  av_assert0(best_ast->remaining <= best_ast->packet_size);
1389 
1390  avi->stream_index = best_stream_index;
1391  if (!best_ast->remaining)
1392  best_ast->packet_size =
1393  best_ast->remaining = best_st->index_entries[i].size;
1394  }
1395  else
1396  return AVERROR_EOF;
1397 
1398  return 0;
1399 }
1400 
1402 {
1403  AVIContext *avi = s->priv_data;
1404  AVIOContext *pb = s->pb;
1405  int err;
1406 
1407  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1408  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1409  if (size >= 0)
1410  return size;
1411  else
1412  goto resync;
1413  }
1414 
1415  if (avi->non_interleaved) {
1416  err = ni_prepare_read(s);
1417  if (err < 0)
1418  return err;
1419  }
1420 
1421 resync:
1422  if (avi->stream_index >= 0) {
1423  AVStream *st = s->streams[avi->stream_index];
1424  AVIStream *ast = st->priv_data;
1425  int size, err;
1426 
1427  if (get_subtitle_pkt(s, st, pkt))
1428  return 0;
1429 
1430  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1431  if (ast->sample_size <= 1)
1432  size = INT_MAX;
1433  else if (ast->sample_size < 32)
1434  // arbitrary multiplier to avoid tiny packets for raw PCM data
1435  size = 1024 * ast->sample_size;
1436  else
1437  size = ast->sample_size;
1438 
1439  if (size > ast->remaining)
1440  size = ast->remaining;
1441  avi->last_pkt_pos = avio_tell(pb);
1442  err = av_get_packet(pb, pkt, size);
1443  if (err < 0)
1444  return err;
1445  size = err;
1446 
1447  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1448  uint8_t *pal;
1449  pal = av_packet_new_side_data(pkt,
1451  AVPALETTE_SIZE);
1452  if (!pal) {
1453  av_log(s, AV_LOG_ERROR,
1454  "Failed to allocate data for palette\n");
1455  } else {
1456  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1457  ast->has_pal = 0;
1458  }
1459  }
1460 
1461  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1462  AVBufferRef *avbuf = pkt->buf;
1463  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1464  pkt->data, pkt->size, pkt->pos);
1465  pkt->buf = avbuf;
1466  pkt->flags |= AV_PKT_FLAG_KEY;
1467  if (size < 0)
1468  av_packet_unref(pkt);
1469  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1470  !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1471  ast->frame_offset++;
1472  avi->stream_index = -1;
1473  ast->remaining = 0;
1474  goto resync;
1475  } else {
1476  /* XXX: How to handle B-frames in AVI? */
1477  pkt->dts = ast->frame_offset;
1478 // pkt->dts += ast->start;
1479  if (ast->sample_size)
1480  pkt->dts /= ast->sample_size;
1481  av_log(s, AV_LOG_TRACE,
1482  "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1483  "base:%d st:%d size:%d\n",
1484  pkt->dts,
1485  ast->frame_offset,
1486  ast->scale,
1487  ast->rate,
1488  ast->sample_size,
1489  AV_TIME_BASE,
1490  avi->stream_index,
1491  size);
1492  pkt->stream_index = avi->stream_index;
1493 
1494  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1495  AVIndexEntry *e;
1496  int index;
1497 
1499  e = &st->index_entries[index];
1500 
1501  if (index >= 0 && e->timestamp == ast->frame_offset) {
1502  if (index == st->nb_index_entries-1) {
1503  int key=1;
1504  uint32_t state=-1;
1505  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1506  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1507  while (ptr < end) {
1508  ptr = avpriv_find_start_code(ptr, end, &state);
1509  if (state == 0x1B6 && ptr < end) {
1510  key = !(*ptr & 0xC0);
1511  break;
1512  }
1513  }
1514  }
1515  if (!key)
1516  e->flags &= ~AVINDEX_KEYFRAME;
1517  }
1518  if (e->flags & AVINDEX_KEYFRAME)
1519  pkt->flags |= AV_PKT_FLAG_KEY;
1520  }
1521  } else {
1522  pkt->flags |= AV_PKT_FLAG_KEY;
1523  }
1524  ast->frame_offset += get_duration(ast, pkt->size);
1525  }
1526  ast->remaining -= err;
1527  if (!ast->remaining) {
1528  avi->stream_index = -1;
1529  ast->packet_size = 0;
1530  }
1531 
1532  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1533  av_packet_unref(pkt);
1534  goto resync;
1535  }
1536  ast->seek_pos= 0;
1537 
1538  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1539  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1540 
1541  if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1542  avi->non_interleaved= 1;
1543  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1544  }else if (avi->dts_max < dts)
1545  avi->dts_max = dts;
1546  }
1547 
1548  return 0;
1549  }
1550 
1551  if ((err = avi_sync(s, 0)) < 0)
1552  return err;
1553  goto resync;
1554 }
1555 
1556 /* XXX: We make the implicit supposition that the positions are sorted
1557  * for each stream. */
1559 {
1560  AVIContext *avi = s->priv_data;
1561  AVIOContext *pb = s->pb;
1562  int nb_index_entries, i;
1563  AVStream *st;
1564  AVIStream *ast;
1565  int64_t pos;
1566  unsigned int index, tag, flags, len, first_packet = 1;
1567  int64_t last_pos = -1;
1568  unsigned last_idx = -1;
1569  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1570  int anykey = 0;
1571 
1572  nb_index_entries = size / 16;
1573  if (nb_index_entries <= 0)
1574  return AVERROR_INVALIDDATA;
1575 
1576  idx1_pos = avio_tell(pb);
1577  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1578  if (avi_sync(s, 1) == 0)
1579  first_packet_pos = avio_tell(pb) - 8;
1580  avi->stream_index = -1;
1581  avio_seek(pb, idx1_pos, SEEK_SET);
1582 
1583  if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1584  first_packet_pos = 0;
1585  data_offset = avi->movi_list;
1586  }
1587 
1588  /* Read the entries and sort them in each stream component. */
1589  for (i = 0; i < nb_index_entries; i++) {
1590  if (avio_feof(pb))
1591  return -1;
1592 
1593  tag = avio_rl32(pb);
1594  flags = avio_rl32(pb);
1595  pos = avio_rl32(pb);
1596  len = avio_rl32(pb);
1597  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1598  i, tag, flags, pos, len);
1599 
1600  index = ((tag & 0xff) - '0') * 10;
1601  index += (tag >> 8 & 0xff) - '0';
1602  if (index >= s->nb_streams)
1603  continue;
1604  st = s->streams[index];
1605  ast = st->priv_data;
1606 
1607  /* Skip 'xxpc' palette change entries in the index until a logic
1608  * to process these is properly implemented. */
1609  if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1610  continue;
1611 
1612  if (first_packet && first_packet_pos) {
1613  if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1614  data_offset = first_packet_pos - pos;
1615  first_packet = 0;
1616  }
1617  pos += data_offset;
1618 
1619  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1620 
1621  // even if we have only a single stream, we should
1622  // switch to non-interleaved to get correct timestamps
1623  if (last_pos == pos)
1624  avi->non_interleaved = 1;
1625  if (last_idx != pos && len) {
1626  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1627  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1628  last_idx= pos;
1629  }
1630  ast->cum_len += get_duration(ast, len);
1631  last_pos = pos;
1632  anykey |= flags&AVIIF_INDEX;
1633  }
1634  if (!anykey) {
1635  for (index = 0; index < s->nb_streams; index++) {
1636  st = s->streams[index];
1637  if (st->nb_index_entries)
1639  }
1640  }
1641  return 0;
1642 }
1643 
1644 /* Scan the index and consider any file with streams more than
1645  * 2 seconds or 64MB apart non-interleaved. */
1647 {
1648  int64_t min_pos, pos;
1649  int i;
1650  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1651  if (!idx)
1652  return AVERROR(ENOMEM);
1653  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1654  int64_t max_dts = INT64_MIN / 2;
1655  int64_t min_dts = INT64_MAX / 2;
1656  int64_t max_buffer = 0;
1657 
1658  min_pos = INT64_MAX;
1659 
1660  for (i = 0; i < s->nb_streams; i++) {
1661  AVStream *st = s->streams[i];
1662  AVIStream *ast = st->priv_data;
1663  int n = st->nb_index_entries;
1664  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1665  idx[i]++;
1666  if (idx[i] < n) {
1667  int64_t dts;
1668  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1669  FFMAX(ast->sample_size, 1),
1670  st->time_base, AV_TIME_BASE_Q);
1671  min_dts = FFMIN(min_dts, dts);
1672  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1673  }
1674  }
1675  for (i = 0; i < s->nb_streams; i++) {
1676  AVStream *st = s->streams[i];
1677  AVIStream *ast = st->priv_data;
1678 
1679  if (idx[i] && min_dts != INT64_MAX / 2) {
1680  int64_t dts;
1681  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1682  FFMAX(ast->sample_size, 1),
1683  st->time_base, AV_TIME_BASE_Q);
1684  max_dts = FFMAX(max_dts, dts);
1685  max_buffer = FFMAX(max_buffer,
1686  av_rescale(dts - min_dts,
1687  st->codecpar->bit_rate,
1688  AV_TIME_BASE));
1689  }
1690  }
1691  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1692  max_buffer > 1024 * 1024 * 8 * 8) {
1693  av_free(idx);
1694  return 1;
1695  }
1696  }
1697  av_free(idx);
1698  return 0;
1699 }
1700 
1702 {
1703  int i;
1704  int64_t last_start = 0;
1705  int64_t first_end = INT64_MAX;
1706  int64_t oldpos = avio_tell(s->pb);
1707 
1708  for (i = 0; i < s->nb_streams; i++) {
1709  AVStream *st = s->streams[i];
1710  int n = st->nb_index_entries;
1711  unsigned int size;
1712 
1713  if (n <= 0)
1714  continue;
1715 
1716  if (n >= 2) {
1717  int64_t pos = st->index_entries[0].pos;
1718  unsigned tag[2];
1719  avio_seek(s->pb, pos, SEEK_SET);
1720  tag[0] = avio_r8(s->pb);
1721  tag[1] = avio_r8(s->pb);
1722  avio_rl16(s->pb);
1723  size = avio_rl32(s->pb);
1724  if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1725  last_start = INT64_MAX;
1726  if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1727  last_start = INT64_MAX;
1728  }
1729 
1730  if (st->index_entries[0].pos > last_start)
1731  last_start = st->index_entries[0].pos;
1732  if (st->index_entries[n - 1].pos < first_end)
1733  first_end = st->index_entries[n - 1].pos;
1734  }
1735  avio_seek(s->pb, oldpos, SEEK_SET);
1736 
1737  if (last_start > first_end)
1738  return 1;
1739 
1740  return check_stream_max_drift(s);
1741 }
1742 
1744 {
1745  AVIContext *avi = s->priv_data;
1746  AVIOContext *pb = s->pb;
1747  uint32_t tag, size;
1748  int64_t pos = avio_tell(pb);
1749  int64_t next;
1750  int ret = -1;
1751 
1752  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1753  goto the_end; // maybe truncated file
1754  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1755  for (;;) {
1756  tag = avio_rl32(pb);
1757  size = avio_rl32(pb);
1758  if (avio_feof(pb))
1759  break;
1760  next = avio_tell(pb) + size + (size & 1);
1761 
1762  av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n",
1763  tag & 0xff,
1764  (tag >> 8) & 0xff,
1765  (tag >> 16) & 0xff,
1766  (tag >> 24) & 0xff,
1767  size);
1768 
1769  if (tag == MKTAG('i', 'd', 'x', '1') &&
1770  avi_read_idx1(s, size) >= 0) {
1771  avi->index_loaded=2;
1772  ret = 0;
1773  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1774  uint32_t tag1 = avio_rl32(pb);
1775 
1776  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1777  ff_read_riff_info(s, size - 4);
1778  }else if (!ret)
1779  break;
1780 
1781  if (avio_seek(pb, next, SEEK_SET) < 0)
1782  break; // something is wrong here
1783  }
1784 
1785 the_end:
1786  avio_seek(pb, pos, SEEK_SET);
1787  return ret;
1788 }
1789 
1790 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1791 {
1792  AVIStream *ast2 = st2->priv_data;
1793  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1794  av_packet_unref(&ast2->sub_pkt);
1795  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1796  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1797  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1798 }
1799 
1800 static int avi_read_seek(AVFormatContext *s, int stream_index,
1801  int64_t timestamp, int flags)
1802 {
1803  AVIContext *avi = s->priv_data;
1804  AVStream *st;
1805  int i, index;
1806  int64_t pos, pos_min;
1807  AVIStream *ast;
1808 
1809  /* Does not matter which stream is requested dv in avi has the
1810  * stream information in the first video stream.
1811  */
1812  if (avi->dv_demux)
1813  stream_index = 0;
1814 
1815  if (!avi->index_loaded) {
1816  /* we only load the index on demand */
1817  avi_load_index(s);
1818  avi->index_loaded |= 1;
1819  }
1820  av_assert0(stream_index >= 0);
1821 
1822  st = s->streams[stream_index];
1823  ast = st->priv_data;
1824  index = av_index_search_timestamp(st,
1825  timestamp * FFMAX(ast->sample_size, 1),
1826  flags);
1827  if (index < 0) {
1828  if (st->nb_index_entries > 0)
1829  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1830  timestamp * FFMAX(ast->sample_size, 1),
1831  st->index_entries[0].timestamp,
1833  return AVERROR_INVALIDDATA;
1834  }
1835 
1836  /* find the position */
1837  pos = st->index_entries[index].pos;
1838  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1839 
1840  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1841  timestamp, index, st->index_entries[index].timestamp);
1842 
1843  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1844  /* One and only one real stream for DV in AVI, and it has video */
1845  /* offsets. Calling with other stream indexes should have failed */
1846  /* the av_index_search_timestamp call above. */
1847 
1848  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1849  return -1;
1850 
1851  /* Feed the DV video stream version of the timestamp to the */
1852  /* DV demux so it can synthesize correct timestamps. */
1853  ff_dv_offset_reset(avi->dv_demux, timestamp);
1854 
1855  avi->stream_index = -1;
1856  return 0;
1857  }
1858 
1859  pos_min = pos;
1860  for (i = 0; i < s->nb_streams; i++) {
1861  AVStream *st2 = s->streams[i];
1862  AVIStream *ast2 = st2->priv_data;
1863 
1864  ast2->packet_size =
1865  ast2->remaining = 0;
1866 
1867  if (ast2->sub_ctx) {
1868  seek_subtitle(st, st2, timestamp);
1869  continue;
1870  }
1871 
1872  if (st2->nb_index_entries <= 0)
1873  continue;
1874 
1875 // av_assert1(st2->codecpar->block_align);
1876  index = av_index_search_timestamp(st2,
1877  av_rescale_q(timestamp,
1878  st->time_base,
1879  st2->time_base) *
1880  FFMAX(ast2->sample_size, 1),
1881  flags |
1884  if (index < 0)
1885  index = 0;
1886  ast2->seek_pos = st2->index_entries[index].pos;
1887  pos_min = FFMIN(pos_min,ast2->seek_pos);
1888  }
1889  for (i = 0; i < s->nb_streams; i++) {
1890  AVStream *st2 = s->streams[i];
1891  AVIStream *ast2 = st2->priv_data;
1892 
1893  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1894  continue;
1895 
1896  index = av_index_search_timestamp(
1897  st2,
1898  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1900  if (index < 0)
1901  index = 0;
1902  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1903  index--;
1904  ast2->frame_offset = st2->index_entries[index].timestamp;
1905  }
1906 
1907  /* do the seek */
1908  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1909  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1910  return -1;
1911  }
1912  avi->stream_index = -1;
1913  avi->dts_max = INT_MIN;
1914  return 0;
1915 }
1916 
1918 {
1919  int i;
1920  AVIContext *avi = s->priv_data;
1921 
1922  for (i = 0; i < s->nb_streams; i++) {
1923  AVStream *st = s->streams[i];
1924  AVIStream *ast = st->priv_data;
1925  if (ast) {
1926  if (ast->sub_ctx) {
1927  av_freep(&ast->sub_ctx->pb);
1929  }
1930  av_freep(&ast->sub_buffer);
1931  av_packet_unref(&ast->sub_pkt);
1932  }
1933  }
1934 
1935  av_freep(&avi->dv_demux);
1936 
1937  return 0;
1938 }
1939 
1940 static int avi_probe(AVProbeData *p)
1941 {
1942  int i;
1943 
1944  /* check file header */
1945  for (i = 0; avi_headers[i][0]; i++)
1946  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1947  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1948  return AVPROBE_SCORE_MAX;
1949 
1950  return 0;
1951 }
1952 
1954  .name = "avi",
1955  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1956  .priv_data_size = sizeof(AVIContext),
1957  .extensions = "avi",
1958  .read_probe = avi_probe,
1963  .priv_class = &demuxer_class,
1964 };
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:1136
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2401
#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:812
uint32_t handler
Definition: avidec.c:48
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:147
#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:309
uint32_t pal[256]
Definition: avidec.c:57
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
AVOption.
Definition: opt.h:246
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:1957
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3024
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:85
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:210
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:211
#define MAX_ODML_DEPTH
Definition: avidec.c:84
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1621
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:4578
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:145
const char * desc
Definition: nvenc.c:60
int64_t pos
Definition: avformat.h:820
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2403
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
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3981
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:956
int dshow_block_align
Definition: avidec.c:59
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:890
int size
Definition: avcodec.h:1602
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:230
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:475
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1087
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:904
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
#define AVIIF_INDEX
Definition: avi.h:39
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:3166
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
discard all
Definition: avcodec.h:787
static AVPacket pkt
static int ni_prepare_read(AVFormatContext *s)
Definition: avidec.c:1332
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.
static int check_stream_max_drift(AVFormatContext *s)
Definition: avidec.c:1646
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:112
Format I/O context.
Definition: avformat.h:1338
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:1451
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:254
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:197
int width
Video only.
Definition: avcodec.h:4047
AVOptions.
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1917
int64_t riff_end
Definition: avidec.c:71
const AVCodecTag ff_codec_movvideo_tags[]
Definition: isom.c:73
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:757
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
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:1076
int id
Format-specific stream ID.
Definition: avformat.h:896
int64_t movi_list
Definition: avidec.c:75
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:4211
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1406
int64_t duration
Definition: movenc.c:63
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:132
static void clean_index(AVFormatContext *s)
Definition: avidec.c:271
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:40
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1449
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:324
uint8_t * data
Definition: avcodec.h:1601
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
Definition: avidec.c:1070
static int flags
Definition: log.c:57
uint32_t tag
Definition: movenc.c:1412
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
struct AVStream::@190 * info
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:289
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:511
static const uint8_t header[24]
Definition: sdr2.c:67
#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:604
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:88
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:4010
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1633
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:827
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:126
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:4148
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:1554
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2066
av_default_item_name
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:726
#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:821
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
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:517
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3977
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1584
int avpriv_exif_decode_ifd(void *logctx, 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
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:1170
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:967
#define FFMAX(a, b)
Definition: common.h:94
static void error(const char *err)
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:226
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:249
#define fail()
Definition: checkasm.h:84
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1607
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3999
Only parse headers, do not repack.
Definition: avformat.h:811
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:595
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1394
int prefix_count
Definition: avidec.c:56
int non_interleaved
Definition: avidec.c:79
int block_align
Audio only.
Definition: avcodec.h:4098
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:243
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:248
#define FFMIN(a, b)
Definition: common.h:96
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
Definition: dv.c:436
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:76
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int64_t cum_len
Definition: avidec.c:54
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 ...
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:1790
static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
Definition: avidec.c:388
#define AVFMT_FLAG_SORT_DTS
try to interleave outputted packets by dts (using this flag can slow demuxing down) ...
Definition: avformat.h:1468
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2976
int n
Definition: avisynth_c.h:684
AVDictionary * metadata
Definition: avformat.h:958
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:194
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:196
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:776
static int calculate_bitrate(AVFormatContext *s)
Definition: avidec.c:426
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:514
Stream structure.
Definition: avformat.h:889
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:1401
int prefix
Definition: avidec.c:55
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
Definition: mem.c:187
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1230
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, uint8_t *buf, int buf_size, int64_t pos)
Definition: dv.c:364
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:254
AVIOContext * pb
I/O context.
Definition: avformat.h:1380
static int resync(AVFormatContext *s)
Definition: flvdec.c:887
int index_loaded
Definition: avidec.c:77
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:568
static struct @246 state
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: avformat.h:1027
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:70
int nb_index_entries
Definition: avformat.h:1089
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:1558
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:277
byte swapping routines
discard useless packets like 0 size packets in avi
Definition: avcodec.h:782
#define snprintf
Definition: snprintf.h:34
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:471
static int avi_probe(AVProbeData *p)
Definition: avidec.c:1940
int error
contains the error code or 0 if no error happened
Definition: avio.h:228
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
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:2447
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:520
int64_t seek_pos
Definition: avidec.c:66
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1743
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1953
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:943
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
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:810
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:710
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:80
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:936
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1581
static int get_riff(AVFormatContext *s, AVIOContext *pb)
Definition: avidec.c:138
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, 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:3208
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:945
int den
Denominator.
Definition: rational.h:60
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
Definition: dv.c:347
int sample_size
Definition: avidec.c:51
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4183
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:734
#define av_free(p)
char * value
Definition: dict.h:87
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
int len
int has_pal
Definition: avidec.c:58
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1701
void * priv_data
Format private data.
Definition: avformat.h:1366
#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:509
int64_t fsize
Definition: avidec.c:73
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4023
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3995
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:168
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1600
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1800
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1433
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
AVCodecParameters * codecpar
Definition: avformat.h:1241
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3985
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:318
int stream_index
Definition: avcodec.h:1603
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:926
#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:949
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:1122
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1578
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:734
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:1184
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