FFmpeg  4.4
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/opt.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "avformat.h"
32 #include "avi.h"
33 #include "dv.h"
34 #include "internal.h"
35 #include "isom.h"
36 #include "riff.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
39 #include "libavcodec/internal.h"
40 
41 typedef struct AVIStream {
42  int64_t frame_offset; /* current frame (video) or byte (audio) counter
43  * (used to compute the pts) */
44  int remaining;
46 
47  uint32_t handler;
48  uint32_t scale;
49  uint32_t rate;
50  int sample_size; /* size of one sample (or packet)
51  * (in the rate/scale sense) in bytes */
52 
53  int64_t cum_len; /* temporary storage (used during seek) */
54  int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
56  uint32_t pal[256];
57  int has_pal;
58  int dshow_block_align; /* block align variable used to emulate bugs in
59  * the MS dshow demuxer */
60 
64 
65  int64_t seek_pos;
66 } AVIStream;
67 
68 typedef struct AVIContext {
69  const AVClass *class;
70  int64_t riff_end;
71  int64_t movi_end;
72  int64_t fsize;
73  int64_t io_fsize;
74  int64_t movi_list;
75  int64_t last_pkt_pos;
77  int is_odml;
82  int use_odml;
83 #define MAX_ODML_DEPTH 1000
84  int64_t dts_max;
85 } AVIContext;
86 
87 
88 static const AVOption options[] = {
89  { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
90  { NULL },
91 };
92 
93 static const AVClass demuxer_class = {
94  .class_name = "avi",
95  .item_name = av_default_item_name,
96  .option = options,
97  .version = LIBAVUTIL_VERSION_INT,
98  .category = AV_CLASS_CATEGORY_DEMUXER,
99 };
100 
101 
102 static const char avi_headers[][8] = {
103  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
104  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
105  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
106  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
107  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
108  { 0 }
109 };
110 
112  { "strn", "title" },
113  { "isbj", "subject" },
114  { "inam", "title" },
115  { "iart", "artist" },
116  { "icop", "copyright" },
117  { "icmt", "comment" },
118  { "ignr", "genre" },
119  { "iprd", "product" },
120  { "isft", "software" },
121 
122  { 0 },
123 };
124 
125 static int avi_read_close(AVFormatContext *s);
126 static int avi_load_index(AVFormatContext *s);
127 static int guess_ni_flag(AVFormatContext *s);
128 
129 #define print_tag(s, str, tag, size) \
130  av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
131  avio_tell(pb), str, av_fourcc2str(tag), size) \
132 
133 static inline int get_duration(AVIStream *ast, int len)
134 {
135  if (ast->sample_size)
136  return len;
137  else if (ast->dshow_block_align)
138  return (len + (int64_t)ast->dshow_block_align - 1) / ast->dshow_block_align;
139  else
140  return 1;
141 }
142 
144 {
145  AVIContext *avi = s->priv_data;
146  char header[8] = {0};
147  int i;
148 
149  /* check RIFF header */
150  avio_read(pb, header, 4);
151  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
152  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
153  avio_read(pb, header + 4, 4);
154 
155  for (i = 0; avi_headers[i][0]; i++)
156  if (!memcmp(header, avi_headers[i], 8))
157  break;
158  if (!avi_headers[i][0])
159  return AVERROR_INVALIDDATA;
160 
161  if (header[7] == 0x19)
163  "This file has been generated by a totally broken muxer.\n");
164 
165  return 0;
166 }
167 
168 static int read_odml_index(AVFormatContext *s, int frame_num)
169 {
170  AVIContext *avi = s->priv_data;
171  AVIOContext *pb = s->pb;
172  int longs_per_entry = avio_rl16(pb);
173  int index_sub_type = avio_r8(pb);
174  int index_type = avio_r8(pb);
175  int entries_in_use = avio_rl32(pb);
176  int chunk_id = avio_rl32(pb);
177  int64_t base = avio_rl64(pb);
178  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
179  ((chunk_id >> 8 & 0xFF) - '0');
180  AVStream *st;
181  AVIStream *ast;
182  int i;
183  int64_t last_pos = -1;
184  int64_t filesize = avi->fsize;
185 
187  "longs_per_entry:%d index_type:%d entries_in_use:%d "
188  "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
189  longs_per_entry,
190  index_type,
191  entries_in_use,
192  chunk_id,
193  base,
194  frame_num);
195 
196  if (stream_id >= s->nb_streams || stream_id < 0)
197  return AVERROR_INVALIDDATA;
198  st = s->streams[stream_id];
199  ast = st->priv_data;
200 
201  if (index_sub_type)
202  return AVERROR_INVALIDDATA;
203 
204  avio_rl32(pb);
205 
206  if (index_type && longs_per_entry != 2)
207  return AVERROR_INVALIDDATA;
208  if (index_type > 1)
209  return AVERROR_INVALIDDATA;
210 
211  if (filesize > 0 && base >= filesize) {
212  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
213  if (base >> 32 == (base & 0xFFFFFFFF) &&
214  (base & 0xFFFFFFFF) < filesize &&
215  filesize <= 0xFFFFFFFF)
216  base &= 0xFFFFFFFF;
217  else
218  return AVERROR_INVALIDDATA;
219  }
220 
221  for (i = 0; i < entries_in_use; i++) {
222  if (index_type) {
223  int64_t pos = avio_rl32(pb) + base - 8;
224  int len = avio_rl32(pb);
225  int key = len >= 0;
226  len &= 0x7FFFFFFF;
227 
228  av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
229 
230  if (avio_feof(pb))
231  return AVERROR_INVALIDDATA;
232 
233  if (last_pos == pos || pos == base - 8)
234  avi->non_interleaved = 1;
235  if (last_pos != pos && len)
236  av_add_index_entry(st, pos, ast->cum_len, len, 0,
237  key ? AVINDEX_KEYFRAME : 0);
238 
239  ast->cum_len += get_duration(ast, len);
240  last_pos = pos;
241  } else {
242  int64_t offset, pos;
243  int duration;
244  offset = avio_rl64(pb);
245  avio_rl32(pb); /* size */
246  duration = avio_rl32(pb);
247 
248  if (avio_feof(pb))
249  return AVERROR_INVALIDDATA;
250 
251  pos = avio_tell(pb);
252 
253  if (avi->odml_depth > MAX_ODML_DEPTH) {
254  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
255  return AVERROR_INVALIDDATA;
256  }
257 
258  if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
259  return -1;
260  avi->odml_depth++;
261  read_odml_index(s, frame_num);
262  avi->odml_depth--;
263  frame_num += duration;
264 
265  if (avio_seek(pb, pos, SEEK_SET) < 0) {
266  av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
267  return -1;
268  }
269 
270  }
271  }
272  avi->index_loaded = 2;
273  return 0;
274 }
275 
277 {
278  int i;
279  int64_t j;
280 
281  for (i = 0; i < s->nb_streams; i++) {
282  AVStream *st = s->streams[i];
283  AVIStream *ast = st->priv_data;
284  int n = st->nb_index_entries;
285  int max = ast->sample_size;
286  int64_t pos, size, ts;
287 
288  if (n != 1 || ast->sample_size == 0)
289  continue;
290 
291  while (max < 1024)
292  max += max;
293 
294  pos = st->index_entries[0].pos;
295  size = st->index_entries[0].size;
296  ts = st->index_entries[0].timestamp;
297 
298  for (j = 0; j < size; j += max)
299  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
301  }
302 }
303 
304 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
305  uint32_t size)
306 {
307  AVIOContext *pb = s->pb;
308  char key[5] = { 0 };
309  char *value;
310 
311  size += (size & 1);
312 
313  if (size == UINT_MAX)
314  return AVERROR(EINVAL);
315  value = av_malloc(size + 1);
316  if (!value)
317  return AVERROR(ENOMEM);
318  if (avio_read(pb, value, size) != size) {
319  av_freep(&value);
320  return AVERROR_INVALIDDATA;
321  }
322  value[size] = 0;
323 
324  AV_WL32(key, tag);
325 
326  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
328 }
329 
330 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
331  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
332 
333 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
334 {
335  char month[4], time[9], buffer[64];
336  int i, day, year;
337  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
338  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
339  month, &day, time, &year) == 4) {
340  for (i = 0; i < 12; i++)
341  if (!av_strcasecmp(month, months[i])) {
342  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
343  year, i + 1, day, time);
344  av_dict_set(metadata, "creation_time", buffer, 0);
345  }
346  } else if (date[4] == '/' && date[7] == '/') {
347  date[4] = date[7] = '-';
348  av_dict_set(metadata, "creation_time", date, 0);
349  }
350 }
351 
352 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
353 {
354  while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
355  uint32_t tag = avio_rl32(s->pb);
356  uint32_t size = avio_rl32(s->pb);
357  switch (tag) {
358  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
359  {
360  uint64_t tag_end = avio_tell(s->pb) + size;
361  while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
362  uint16_t tag = avio_rl16(s->pb);
363  uint16_t size = avio_rl16(s->pb);
364  const char *name = NULL;
365  char buffer[64] = { 0 };
366  size = FFMIN(size, tag_end - avio_tell(s->pb));
367  size -= avio_read(s->pb, buffer,
368  FFMIN(size, sizeof(buffer) - 1));
369  switch (tag) {
370  case 0x03:
371  name = "maker";
372  break;
373  case 0x04:
374  name = "model";
375  break;
376  case 0x13:
377  name = "creation_time";
378  if (buffer[4] == ':' && buffer[7] == ':')
379  buffer[4] = buffer[7] = '-';
380  break;
381  }
382  if (name)
383  av_dict_set(&s->metadata, name, buffer, 0);
384  avio_skip(s->pb, size);
385  }
386  break;
387  }
388  default:
389  avio_skip(s->pb, size);
390  break;
391  }
392  }
393 }
394 
396 {
397  GetByteContext gb;
398  uint8_t *data = st->codecpar->extradata;
399  int data_size = st->codecpar->extradata_size;
400  int tag, offset;
401 
402  if (!data || data_size < 8) {
403  return AVERROR_INVALIDDATA;
404  }
405 
406  bytestream2_init(&gb, data, data_size);
407 
408  tag = bytestream2_get_le32(&gb);
409 
410  switch (tag) {
411  case MKTAG('A', 'V', 'I', 'F'):
412  // skip 4 byte padding
413  bytestream2_skip(&gb, 4);
414  offset = bytestream2_tell(&gb);
415 
416  // decode EXIF tags from IFD, AVI is always little-endian
417  return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
418  1, 0, &st->metadata);
419  break;
420  case MKTAG('C', 'A', 'S', 'I'):
421  avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
422  break;
423  case MKTAG('Z', 'o', 'r', 'a'):
424  avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
425  break;
426  default:
427  break;
428  }
429 
430  return 0;
431 }
432 
434 {
435  AVIContext *avi = s->priv_data;
436  int i, j;
437  int64_t lensum = 0;
438  int64_t maxpos = 0;
439 
440  for (i = 0; i<s->nb_streams; i++) {
441  int64_t len = 0;
442  AVStream *st = s->streams[i];
443 
444  if (!st->nb_index_entries)
445  continue;
446 
447  for (j = 0; j < st->nb_index_entries; j++)
448  len += st->index_entries[j].size;
449  maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
450  lensum += len;
451  }
452  if (maxpos < av_rescale(avi->io_fsize, 9, 10)) // index does not cover the whole file
453  return 0;
454  if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
455  return 0;
456 
457  for (i = 0; i<s->nb_streams; i++) {
458  int64_t len = 0;
459  AVStream *st = s->streams[i];
460  int64_t duration;
461  int64_t bitrate;
462 
463  for (j = 0; j < st->nb_index_entries; j++)
464  len += st->index_entries[j].size;
465 
466  if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
467  continue;
470  if (bitrate > 0) {
471  st->codecpar->bit_rate = bitrate;
472  }
473  }
474  return 1;
475 }
476 
477 #define RETURN_ERROR(code) do { ret = (code); goto fail; } while (0)
479 {
480  AVIContext *avi = s->priv_data;
481  AVIOContext *pb = s->pb;
482  unsigned int tag, tag1, handler;
483  int codec_type, stream_index, frame_period;
484  unsigned int size;
485  int i;
486  AVStream *st;
487  AVIStream *ast = NULL;
488  int avih_width = 0, avih_height = 0;
489  int amv_file_format = 0;
490  uint64_t list_end = 0;
491  int64_t pos;
492  int ret;
493  AVDictionaryEntry *dict_entry;
494 
495  avi->stream_index = -1;
496 
497  ret = get_riff(s, pb);
498  if (ret < 0)
499  return ret;
500 
501  av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
502 
503  avi->io_fsize = avi->fsize = avio_size(pb);
504  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
505  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
506 
507  /* first list tag */
508  stream_index = -1;
509  codec_type = -1;
510  frame_period = 0;
511  for (;;) {
512  if (avio_feof(pb))
514  tag = avio_rl32(pb);
515  size = avio_rl32(pb);
516 
517  print_tag(s, "tag", tag, size);
518 
519  switch (tag) {
520  case MKTAG('L', 'I', 'S', 'T'):
521  list_end = avio_tell(pb) + size;
522  /* Ignored, except at start of video packets. */
523  tag1 = avio_rl32(pb);
524 
525  print_tag(s, "list", tag1, 0);
526 
527  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
528  avi->movi_list = avio_tell(pb) - 4;
529  if (size)
530  avi->movi_end = avi->movi_list + size + (size & 1);
531  else
532  avi->movi_end = avi->fsize;
533  av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
534  goto end_of_header;
535  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
536  ff_read_riff_info(s, size - 4);
537  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
538  avi_read_nikon(s, list_end);
539 
540  break;
541  case MKTAG('I', 'D', 'I', 'T'):
542  {
543  unsigned char date[64] = { 0 };
544  size += (size & 1);
545  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
546  avio_skip(pb, size);
547  avi_metadata_creation_time(&s->metadata, date);
548  break;
549  }
550  case MKTAG('d', 'm', 'l', 'h'):
551  avi->is_odml = 1;
552  avio_skip(pb, size + (size & 1));
553  break;
554  case MKTAG('a', 'm', 'v', 'h'):
555  amv_file_format = 1;
556  case MKTAG('a', 'v', 'i', 'h'):
557  /* AVI header */
558  /* using frame_period is bad idea */
559  frame_period = avio_rl32(pb);
560  avio_rl32(pb); /* max. bytes per second */
561  avio_rl32(pb);
563 
564  avio_skip(pb, 2 * 4);
565  avio_rl32(pb);
566  avio_rl32(pb);
567  avih_width = avio_rl32(pb);
568  avih_height = avio_rl32(pb);
569 
570  avio_skip(pb, size - 10 * 4);
571  break;
572  case MKTAG('s', 't', 'r', 'h'):
573  /* stream header */
574 
575  tag1 = avio_rl32(pb);
576  handler = avio_rl32(pb); /* codec tag */
577 
578  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
579  avio_skip(pb, size - 8);
580  break;
581  } else {
582  stream_index++;
583  st = avformat_new_stream(s, NULL);
584  if (!st)
585  RETURN_ERROR(AVERROR(ENOMEM));
586 
587  st->id = stream_index;
588  ast = av_mallocz(sizeof(AVIStream));
589  if (!ast)
590  RETURN_ERROR(AVERROR(ENOMEM));
591  st->priv_data = ast;
592  }
593  if (amv_file_format)
594  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
595  : MKTAG('v', 'i', 'd', 's');
596 
597  print_tag(s, "strh", tag1, -1);
598 
599  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
600  tag1 == MKTAG('i', 'v', 'a', 's')) {
601  int64_t dv_dur;
602 
603  /* After some consideration -- I don't think we
604  * have to support anything but DV in type1 AVIs. */
605  if (s->nb_streams != 1)
607 
608  if (handler != MKTAG('d', 'v', 's', 'd') &&
609  handler != MKTAG('d', 'v', 'h', 'd') &&
610  handler != MKTAG('d', 'v', 's', 'l'))
611  return AVERROR_INVALIDDATA;
612 
613  if (!CONFIG_DV_DEMUXER)
615 
616  ast = s->streams[0]->priv_data;
617  st->priv_data = NULL;
618  ff_free_stream(s, st);
619 
621  if (!avi->dv_demux) {
622  av_free(ast);
623  return AVERROR(ENOMEM);
624  }
625 
626  s->streams[0]->priv_data = ast;
627  avio_skip(pb, 3 * 4);
628  ast->scale = avio_rl32(pb);
629  ast->rate = avio_rl32(pb);
630  avio_skip(pb, 4); /* start time */
631 
632  dv_dur = avio_rl32(pb);
633  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
634  dv_dur *= AV_TIME_BASE;
635  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
636  }
637  /* else, leave duration alone; timing estimation in utils.c
638  * will make a guess based on bitrate. */
639 
640  stream_index = s->nb_streams - 1;
641  avio_skip(pb, size - 9 * 4);
642  break;
643  }
644 
645  av_assert0(stream_index < s->nb_streams);
646  ast->handler = handler;
647 
648  avio_rl32(pb); /* flags */
649  avio_rl16(pb); /* priority */
650  avio_rl16(pb); /* language */
651  avio_rl32(pb); /* initial frame */
652  ast->scale = avio_rl32(pb);
653  ast->rate = avio_rl32(pb);
654  if (!(ast->scale && ast->rate)) {
656  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
657  "(This file has been generated by broken software.)\n",
658  ast->scale,
659  ast->rate);
660  if (frame_period) {
661  ast->rate = 1000000;
662  ast->scale = frame_period;
663  } else {
664  ast->rate = 25;
665  ast->scale = 1;
666  }
667  }
668  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
669 
670  ast->cum_len = avio_rl32(pb); /* start */
671  st->nb_frames = avio_rl32(pb);
672 
673  st->start_time = 0;
674  avio_rl32(pb); /* buffer size */
675  avio_rl32(pb); /* quality */
676  if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
677  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
678  ast->cum_len = 0;
679  }
680  ast->sample_size = avio_rl32(pb);
681  ast->cum_len *= FFMAX(1, ast->sample_size);
682  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
683  ast->rate, ast->scale, ast->sample_size);
684 
685  switch (tag1) {
686  case MKTAG('v', 'i', 'd', 's'):
688 
689  ast->sample_size = 0;
690  st->avg_frame_rate = av_inv_q(st->time_base);
691  break;
692  case MKTAG('a', 'u', 'd', 's'):
694  break;
695  case MKTAG('t', 'x', 't', 's'):
697  break;
698  case MKTAG('d', 'a', 't', 's'):
700  break;
701  default:
702  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
703  }
704 
705  if (ast->sample_size < 0) {
706  if (s->error_recognition & AV_EF_EXPLODE) {
708  "Invalid sample_size %d at stream %d\n",
709  ast->sample_size,
710  stream_index);
712  }
714  "Invalid sample_size %d at stream %d "
715  "setting it to 0\n",
716  ast->sample_size,
717  stream_index);
718  ast->sample_size = 0;
719  }
720 
721  if (ast->sample_size == 0) {
722  st->duration = st->nb_frames;
723  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
724  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
725  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
726  }
727  }
728  ast->frame_offset = ast->cum_len;
729  avio_skip(pb, size - 12 * 4);
730  break;
731  case MKTAG('s', 't', 'r', 'f'):
732  /* stream header */
733  if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
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  }
776  ret = ff_get_extradata(s, st->codecpar, pb,
777  st->codecpar->extradata_size);
778  if (ret < 0)
779  return ret;
780  }
781 
782  // FIXME: check if the encoder really did this correctly
783  if (st->codecpar->extradata_size & 1)
784  avio_r8(pb);
785 
786  /* Extract palette from extradata if bpp <= 8.
787  * This code assumes that extradata contains only palette.
788  * This is true for all paletted codecs implemented in
789  * FFmpeg. */
790  if (st->codecpar->extradata_size &&
791  (st->codecpar->bits_per_coded_sample <= 8)) {
792  int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
793  const uint8_t *pal_src;
794 
795  pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
796  pal_src = st->codecpar->extradata +
797  st->codecpar->extradata_size - pal_size;
798  /* Exclude the "BottomUp" field from the palette */
799  if (pal_src - st->codecpar->extradata >= 9 &&
800  !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
801  pal_src -= 9;
802  for (i = 0; i < pal_size / 4; i++)
803  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
804  ast->has_pal = 1;
805  }
806 
807  print_tag(s, "video", tag1, 0);
808 
810  st->codecpar->codec_tag = tag1;
812  tag1);
813  /* If codec is not found yet, try with the mov tags. */
814  if (!st->codecpar->codec_id) {
815  st->codecpar->codec_id =
817  if (st->codecpar->codec_id)
819  "mov tag found in avi (fourcc %s)\n",
820  av_fourcc2str(tag1));
821  }
822  if (!st->codecpar->codec_id)
824 
825  /* This is needed to get the pict type which is necessary
826  * for generating correct pts. */
828 
829  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
830  ast->handler == MKTAG('X', 'V', 'I', 'D'))
831  st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
832 
833  if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
835  if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
837  if (st->codecpar->codec_id == AV_CODEC_ID_HEVC &&
838  st->codecpar->codec_tag == MKTAG('H', '2', '6', '5'))
840 
841  if (st->codecpar->codec_id == AV_CODEC_ID_AVRN &&
842  st->codecpar->codec_tag == MKTAG('A', 'V', 'R', 'n') &&
843  (st->codecpar->extradata_size < 31 ||
844  memcmp(&st->codecpar->extradata[28], "1:1", 3)))
846 
847  if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
848  st->codecpar->extradata_size < 1U << 30) {
849  st->codecpar->extradata_size += 9;
850  if ((ret = av_reallocp(&st->codecpar->extradata,
851  st->codecpar->extradata_size +
853  st->codecpar->extradata_size = 0;
854  return ret;
855  } else
856  memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
857  "BottomUp", 9);
858  }
859  st->codecpar->height = FFABS(st->codecpar->height);
860 
861 // avio_skip(pb, size - 5 * 4);
862  break;
863  case AVMEDIA_TYPE_AUDIO:
864  ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
865  if (ret < 0)
866  return ret;
868  if (ast->sample_size && st->codecpar->block_align &&
869  ast->sample_size != st->codecpar->block_align) {
870  av_log(s,
872  "sample size (%d) != block align (%d)\n",
873  ast->sample_size,
874  st->codecpar->block_align);
875  ast->sample_size = st->codecpar->block_align;
876  }
877  /* 2-aligned
878  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
879  if (size & 1)
880  avio_skip(pb, 1);
881  /* Force parsing as several audio frames can be in
882  * one packet and timestamps refer to packet start. */
884  /* ADTS header is in extradata, AAC without header must be
885  * stored as exact frames. Parser not needed and it will
886  * fail. */
887  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
890  // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
891  if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
893  /* AVI files with Xan DPCM audio (wrongly) declare PCM
894  * audio in the header but have Axan as stream_code_tag. */
895  if (ast->handler == AV_RL32("Axan")) {
897  st->codecpar->codec_tag = 0;
898  ast->dshow_block_align = 0;
899  }
900  if (amv_file_format) {
902  ast->dshow_block_align = 0;
903  }
904  if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
906  st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
907  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
908  ast->dshow_block_align = 0;
909  }
910  if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
911  st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
912  st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
913  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
914  ast->sample_size = 0;
915  }
916  break;
919  st->internal->request_probe= 1;
920  avio_skip(pb, size);
921  break;
922  default:
925  st->codecpar->codec_tag = 0;
926  avio_skip(pb, size);
927  break;
928  }
929  }
930  break;
931  case MKTAG('s', 't', 'r', 'd'):
932  if (stream_index >= (unsigned)s->nb_streams
933  || s->streams[stream_index]->codecpar->extradata_size
934  || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
935  avio_skip(pb, size);
936  } else {
937  uint64_t cur_pos = avio_tell(pb);
938  if (cur_pos < list_end)
939  size = FFMIN(size, list_end - cur_pos);
940  st = s->streams[stream_index];
941 
942  if (size<(1<<30)) {
943  if (st->codecpar->extradata) {
944  av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
945  }
946  if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
947  goto fail;
948  }
949 
950  if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
951  avio_r8(pb);
952 
953  ret = avi_extract_stream_metadata(s, st);
954  if (ret < 0) {
955  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
956  }
957  }
958  break;
959  case MKTAG('i', 'n', 'd', 'x'):
960  pos = avio_tell(pb);
961  if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
962  avi->use_odml &&
963  read_odml_index(s, 0) < 0 &&
964  (s->error_recognition & AV_EF_EXPLODE))
966  avio_seek(pb, pos + size, SEEK_SET);
967  break;
968  case MKTAG('v', 'p', 'r', 'p'):
969  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
970  AVRational active, active_aspect;
971 
972  st = s->streams[stream_index];
973  avio_rl32(pb);
974  avio_rl32(pb);
975  avio_rl32(pb);
976  avio_rl32(pb);
977  avio_rl32(pb);
978 
979  active_aspect.den = avio_rl16(pb);
980  active_aspect.num = avio_rl16(pb);
981  active.num = avio_rl32(pb);
982  active.den = avio_rl32(pb);
983  avio_rl32(pb); // nbFieldsPerFrame
984 
985  if (active_aspect.num && active_aspect.den &&
986  active.num && active.den) {
987  st->sample_aspect_ratio = av_div_q(active_aspect, active);
988  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
989  active_aspect.num, active_aspect.den,
990  active.num, active.den);
991  }
992  size -= 9 * 4;
993  }
994  avio_skip(pb, size);
995  break;
996  case MKTAG('s', 't', 'r', 'n'):
997  case MKTAG('i', 's', 'b', 'j'):
998  case MKTAG('i', 'n', 'a', 'm'):
999  case MKTAG('i', 'a', 'r', 't'):
1000  case MKTAG('i', 'c', 'o', 'p'):
1001  case MKTAG('i', 'c', 'm', 't'):
1002  case MKTAG('i', 'g', 'n', 'r'):
1003  case MKTAG('i', 'p', 'o', 'd'):
1004  case MKTAG('i', 's', 'o', 'f'):
1005  if (s->nb_streams) {
1006  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
1007  if (ret < 0)
1008  goto fail;
1009  break;
1010  }
1011  default:
1012  if (size > 1000000) {
1014  "Something went wrong during header parsing, "
1015  "tag %s has size %u, "
1016  "I will ignore it and try to continue anyway.\n",
1017  av_fourcc2str(tag), size);
1018  if (s->error_recognition & AV_EF_EXPLODE)
1020  avi->movi_list = avio_tell(pb) - 4;
1021  avi->movi_end = avi->fsize;
1022  goto end_of_header;
1023  }
1024  /* Do not fail for very large idx1 tags */
1025  case MKTAG('i', 'd', 'x', '1'):
1026  /* skip tag */
1027  size += (size & 1);
1028  avio_skip(pb, size);
1029  break;
1030  }
1031  }
1032 
1033 end_of_header:
1034  /* check stream number */
1035  if (stream_index != s->nb_streams - 1) {
1037  }
1038 
1039  if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1040  avi_load_index(s);
1042  avi->index_loaded |= 1;
1043 
1044  if ((ret = guess_ni_flag(s)) < 0)
1045  goto fail;
1046 
1047  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1048 
1049  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1050  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1051  for (i = 0; i < s->nb_streams; i++) {
1052  AVStream *st = s->streams[i];
1056  }
1057 
1058  for (i = 0; i < s->nb_streams; i++) {
1059  AVStream *st = s->streams[i];
1060  if (st->nb_index_entries)
1061  break;
1062  }
1063  // DV-in-AVI cannot be non-interleaved, if set this must be
1064  // a mis-detection.
1065  if (avi->dv_demux)
1066  avi->non_interleaved = 0;
1067  if (i == s->nb_streams && avi->non_interleaved) {
1069  "Non-interleaved AVI without index, switching to interleaved\n");
1070  avi->non_interleaved = 0;
1071  }
1072 
1073  if (avi->non_interleaved) {
1074  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1075  clean_index(s);
1076  }
1077 
1080 
1081  return 0;
1082 fail:
1083  avi_read_close(s);
1084  return ret;
1085 }
1086 
1088 {
1089  if (pkt->size >= 7 &&
1090  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1091  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1092  uint8_t desc[256];
1093  int score = AVPROBE_SCORE_EXTENSION, ret;
1094  AVIStream *ast = st->priv_data;
1095  ff_const59 AVInputFormat *sub_demuxer;
1096  AVRational time_base;
1097  int size;
1098  AVProbeData pd;
1099  unsigned int desc_len;
1101  pkt->size - 7,
1102  0, NULL, NULL, NULL, NULL);
1103  if (!pb)
1104  goto error;
1105 
1106  desc_len = avio_rl32(pb);
1107 
1108  if (desc_len > pb->buf_end - pb->buf_ptr)
1109  goto error;
1110 
1111  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1112  avio_skip(pb, desc_len - ret);
1113  if (*desc)
1114  av_dict_set(&st->metadata, "title", desc, 0);
1115 
1116  avio_rl16(pb); /* flags? */
1117  avio_rl32(pb); /* data size */
1118 
1119  size = pb->buf_end - pb->buf_ptr;
1121  .buf_size = size };
1122  if (!pd.buf)
1123  goto error;
1124  memcpy(pd.buf, pb->buf_ptr, size);
1125  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1126  av_freep(&pd.buf);
1127  if (!sub_demuxer)
1128  goto error;
1129 
1130  if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1131  goto error;
1132 
1133  if (!(ast->sub_pkt = av_packet_alloc()))
1134  goto error;
1135 
1136  if (!(ast->sub_ctx = avformat_alloc_context()))
1137  goto error;
1138 
1139  ast->sub_ctx->pb = pb;
1140 
1141  if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1142  goto error;
1143 
1144  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1145  if (ast->sub_ctx->nb_streams != 1)
1146  goto error;
1147  ff_read_packet(ast->sub_ctx, ast->sub_pkt);
1149  time_base = ast->sub_ctx->streams[0]->time_base;
1150  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1151  }
1152  ast->sub_buffer = pkt->buf;
1153  pkt->buf = NULL;
1155  return 1;
1156 
1157 error:
1158  av_packet_free(&ast->sub_pkt);
1159  av_freep(&ast->sub_ctx);
1160  avio_context_free(&pb);
1161  }
1162  return 0;
1163 }
1164 
1166  AVPacket *pkt)
1167 {
1168  AVIStream *ast, *next_ast = next_st->priv_data;
1169  int64_t ts, next_ts, ts_min = INT64_MAX;
1170  AVStream *st, *sub_st = NULL;
1171  int i;
1172 
1173  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1174  AV_TIME_BASE_Q);
1175 
1176  for (i = 0; i < s->nb_streams; i++) {
1177  st = s->streams[i];
1178  ast = st->priv_data;
1179  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt && ast->sub_pkt->data) {
1180  ts = av_rescale_q(ast->sub_pkt->dts, st->time_base, AV_TIME_BASE_Q);
1181  if (ts <= next_ts && ts < ts_min) {
1182  ts_min = ts;
1183  sub_st = st;
1184  }
1185  }
1186  }
1187 
1188  if (sub_st) {
1189  ast = sub_st->priv_data;
1191  pkt->stream_index = sub_st->index;
1192 
1193  if (ff_read_packet(ast->sub_ctx, ast->sub_pkt) < 0)
1194  ast->sub_pkt->data = NULL;
1195  }
1196  return sub_st;
1197 }
1198 
1199 static int get_stream_idx(const unsigned *d)
1200 {
1201  if (d[0] >= '0' && d[0] <= '9' &&
1202  d[1] >= '0' && d[1] <= '9') {
1203  return (d[0] - '0') * 10 + (d[1] - '0');
1204  } else {
1205  return 100; // invalid stream ID
1206  }
1207 }
1208 
1209 /**
1210  *
1211  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1212  */
1213 static int avi_sync(AVFormatContext *s, int exit_early)
1214 {
1215  AVIContext *avi = s->priv_data;
1216  AVIOContext *pb = s->pb;
1217  int n;
1218  unsigned int d[8];
1219  unsigned int size;
1220  int64_t i, sync;
1221 
1222 start_sync:
1223  memset(d, -1, sizeof(d));
1224  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1225  int j;
1226 
1227  for (j = 0; j < 7; j++)
1228  d[j] = d[j + 1];
1229  d[7] = avio_r8(pb);
1230 
1231  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1232 
1233  n = get_stream_idx(d + 2);
1234  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1235  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1236  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1237  continue;
1238 
1239  // parse ix##
1240  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1241  // parse JUNK
1242  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1243  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1244  (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1245  avio_skip(pb, size);
1246  goto start_sync;
1247  }
1248 
1249  // parse stray LIST
1250  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1251  avio_skip(pb, 4);
1252  goto start_sync;
1253  }
1254 
1255  n = get_stream_idx(d);
1256 
1257  if (!((i - avi->last_pkt_pos) & 1) &&
1258  get_stream_idx(d + 1) < s->nb_streams)
1259  continue;
1260 
1261  // detect ##ix chunk and skip
1262  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1263  avio_skip(pb, size);
1264  goto start_sync;
1265  }
1266 
1267  if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1268  avio_skip(pb, 16 * 3 + 8);
1269  goto start_sync;
1270  }
1271 
1272  if (avi->dv_demux && n != 0)
1273  continue;
1274 
1275  // parse ##dc/##wb
1276  if (n < s->nb_streams) {
1277  AVStream *st;
1278  AVIStream *ast;
1279  st = s->streams[n];
1280  ast = st->priv_data;
1281 
1282  if (!ast) {
1283  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1284  continue;
1285  }
1286 
1287  if (s->nb_streams >= 2) {
1288  AVStream *st1 = s->streams[1];
1289  AVIStream *ast1 = st1->priv_data;
1290  // workaround for broken small-file-bug402.avi
1291  if (ast1 && d[2] == 'w' && d[3] == 'b'
1292  && n == 0
1293  && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1295  && ast->prefix == 'd'*256+'c'
1296  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1297  ) {
1298  n = 1;
1299  st = st1;
1300  ast = ast1;
1302  "Invalid stream + prefix combination, assuming audio.\n");
1303  }
1304  }
1305 
1306  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1307  int k = avio_r8(pb);
1308  int last = (k + avio_r8(pb) - 1) & 0xFF;
1309 
1310  avio_rl16(pb); // flags
1311 
1312  // b + (g << 8) + (r << 16);
1313  for (; k <= last; k++)
1314  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1315 
1316  ast->has_pal = 1;
1317  goto start_sync;
1318  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1319  d[2] < 128 && d[3] < 128) ||
1320  d[2] * 256 + d[3] == ast->prefix /* ||
1321  (d[2] == 'd' && d[3] == 'c') ||
1322  (d[2] == 'w' && d[3] == 'b') */) {
1323  if (exit_early)
1324  return 0;
1325  if (d[2] * 256 + d[3] == ast->prefix)
1326  ast->prefix_count++;
1327  else {
1328  ast->prefix = d[2] * 256 + d[3];
1329  ast->prefix_count = 0;
1330  }
1331 
1332  if (!avi->dv_demux &&
1333  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1334  // FIXME: needs a little reordering
1335  (st->discard >= AVDISCARD_NONKEY &&
1336  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1337  || st->discard >= AVDISCARD_ALL)) {
1338 
1339  ast->frame_offset += get_duration(ast, size);
1340  avio_skip(pb, size);
1341  goto start_sync;
1342  }
1343 
1344  avi->stream_index = n;
1345  ast->packet_size = size + 8;
1346  ast->remaining = size;
1347 
1348  if (size) {
1349  uint64_t pos = avio_tell(pb) - 8;
1350  if (!st->index_entries || !st->nb_index_entries ||
1351  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1353  0, AVINDEX_KEYFRAME);
1354  }
1355  }
1356  return 0;
1357  }
1358  }
1359  }
1360 
1361  if (pb->error)
1362  return pb->error;
1363  return AVERROR_EOF;
1364 }
1365 
1367 {
1368  AVIContext *avi = s->priv_data;
1369  int best_stream_index = 0;
1370  AVStream *best_st = NULL;
1371  AVIStream *best_ast;
1372  int64_t best_ts = INT64_MAX;
1373  int i;
1374 
1375  for (i = 0; i < s->nb_streams; i++) {
1376  AVStream *st = s->streams[i];
1377  AVIStream *ast = st->priv_data;
1378  int64_t ts = ast->frame_offset;
1379  int64_t last_ts;
1380 
1381  if (!st->nb_index_entries)
1382  continue;
1383 
1384  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1385  if (!ast->remaining && ts > last_ts)
1386  continue;
1387 
1388  ts = av_rescale_q(ts, st->time_base,
1389  (AVRational) { FFMAX(1, ast->sample_size),
1390  AV_TIME_BASE });
1391 
1392  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1393  st->time_base.num, st->time_base.den, ast->frame_offset);
1394  if (ts < best_ts) {
1395  best_ts = ts;
1396  best_st = st;
1397  best_stream_index = i;
1398  }
1399  }
1400  if (!best_st)
1401  return AVERROR_EOF;
1402 
1403  best_ast = best_st->priv_data;
1404  best_ts = best_ast->frame_offset;
1405  if (best_ast->remaining) {
1406  i = av_index_search_timestamp(best_st,
1407  best_ts,
1408  AVSEEK_FLAG_ANY |
1410  } else {
1411  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1412  if (i >= 0)
1413  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1414  }
1415 
1416  if (i >= 0) {
1417  int64_t pos = best_st->index_entries[i].pos;
1418  pos += best_ast->packet_size - best_ast->remaining;
1419  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1420  return AVERROR_EOF;
1421 
1422  av_assert0(best_ast->remaining <= best_ast->packet_size);
1423 
1424  avi->stream_index = best_stream_index;
1425  if (!best_ast->remaining)
1426  best_ast->packet_size =
1427  best_ast->remaining = best_st->index_entries[i].size;
1428  }
1429  else
1430  return AVERROR_EOF;
1431 
1432  return 0;
1433 }
1434 
1436 {
1437  AVIContext *avi = s->priv_data;
1438  AVIOContext *pb = s->pb;
1439  int err;
1440 
1441  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1442  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1443  if (size >= 0)
1444  return size;
1445  else
1446  goto resync;
1447  }
1448 
1449  if (avi->non_interleaved) {
1450  err = ni_prepare_read(s);
1451  if (err < 0)
1452  return err;
1453  }
1454 
1455 resync:
1456  if (avi->stream_index >= 0) {
1457  AVStream *st = s->streams[avi->stream_index];
1458  AVIStream *ast = st->priv_data;
1459  int dv_demux = CONFIG_DV_DEMUXER && avi->dv_demux;
1460  int size, err;
1461 
1462  if (get_subtitle_pkt(s, st, pkt))
1463  return 0;
1464 
1465  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1466  if (ast->sample_size <= 1)
1467  size = INT_MAX;
1468  else if (ast->sample_size < 32)
1469  // arbitrary multiplier to avoid tiny packets for raw PCM data
1470  size = 1024 * ast->sample_size;
1471  else
1472  size = ast->sample_size;
1473 
1474  if (size > ast->remaining)
1475  size = ast->remaining;
1476  avi->last_pkt_pos = avio_tell(pb);
1477  err = av_get_packet(pb, pkt, size);
1478  if (err < 0)
1479  return err;
1480  size = err;
1481 
1482  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2 && !dv_demux) {
1483  uint8_t *pal;
1486  AVPALETTE_SIZE);
1487  if (!pal) {
1489  "Failed to allocate data for palette\n");
1490  } else {
1491  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1492  ast->has_pal = 0;
1493  }
1494  }
1495 
1496  if (CONFIG_DV_DEMUXER && dv_demux) {
1497  AVBufferRef *avbuf = pkt->buf;
1499  pkt->data, pkt->size, pkt->pos);
1500  pkt->buf = avbuf;
1502  if (size < 0)
1504  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1505  !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1506  ast->frame_offset++;
1507  avi->stream_index = -1;
1508  ast->remaining = 0;
1509  goto resync;
1510  } else {
1511  /* XXX: How to handle B-frames in AVI? */
1512  pkt->dts = ast->frame_offset;
1513 // pkt->dts += ast->start;
1514  if (ast->sample_size)
1515  pkt->dts /= ast->sample_size;
1516  pkt->stream_index = avi->stream_index;
1517 
1518  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1519  AVIndexEntry *e;
1520  int index;
1521 
1523  e = &st->index_entries[index];
1524 
1525  if (index >= 0 && e->timestamp == ast->frame_offset) {
1526  if (index == st->nb_index_entries-1) {
1527  int key=1;
1528  uint32_t state=-1;
1529  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1530  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1531  while (ptr < end) {
1532  ptr = avpriv_find_start_code(ptr, end, &state);
1533  if (state == 0x1B6 && ptr < end) {
1534  key = !(*ptr & 0xC0);
1535  break;
1536  }
1537  }
1538  }
1539  if (!key)
1540  e->flags &= ~AVINDEX_KEYFRAME;
1541  }
1542  if (e->flags & AVINDEX_KEYFRAME)
1544  }
1545  } else {
1547  }
1548  ast->frame_offset += get_duration(ast, pkt->size);
1549  }
1550  ast->remaining -= err;
1551  if (!ast->remaining) {
1552  avi->stream_index = -1;
1553  ast->packet_size = 0;
1554  }
1555 
1556  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1558  goto resync;
1559  }
1560  ast->seek_pos= 0;
1561 
1562  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1563  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1564 
1565  if (avi->dts_max < dts) {
1566  avi->dts_max = dts;
1567  } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1568  avi->non_interleaved= 1;
1569  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1570  }
1571  }
1572 
1573  return 0;
1574  }
1575 
1576  if ((err = avi_sync(s, 0)) < 0)
1577  return err;
1578  goto resync;
1579 }
1580 
1581 /* XXX: We make the implicit supposition that the positions are sorted
1582  * for each stream. */
1584 {
1585  AVIContext *avi = s->priv_data;
1586  AVIOContext *pb = s->pb;
1587  int nb_index_entries, i;
1588  AVStream *st;
1589  AVIStream *ast;
1590  int64_t pos;
1591  unsigned int index, tag, flags, len, first_packet = 1;
1592  int64_t last_pos = -1;
1593  unsigned last_idx = -1;
1594  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1595  int anykey = 0;
1596 
1597  nb_index_entries = size / 16;
1598  if (nb_index_entries <= 0)
1599  return AVERROR_INVALIDDATA;
1600 
1601  idx1_pos = avio_tell(pb);
1602  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1603  if (avi_sync(s, 1) == 0)
1604  first_packet_pos = avio_tell(pb) - 8;
1605  avi->stream_index = -1;
1606  avio_seek(pb, idx1_pos, SEEK_SET);
1607 
1608  if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1609  first_packet_pos = 0;
1610  data_offset = avi->movi_list;
1611  }
1612 
1613  /* Read the entries and sort them in each stream component. */
1614  for (i = 0; i < nb_index_entries; i++) {
1615  if (avio_feof(pb))
1616  return -1;
1617 
1618  tag = avio_rl32(pb);
1619  flags = avio_rl32(pb);
1620  pos = avio_rl32(pb);
1621  len = avio_rl32(pb);
1622  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1623  i, tag, flags, pos, len);
1624 
1625  index = ((tag & 0xff) - '0') * 10;
1626  index += (tag >> 8 & 0xff) - '0';
1627  if (index >= s->nb_streams)
1628  continue;
1629  st = s->streams[index];
1630  ast = st->priv_data;
1631 
1632  /* Skip 'xxpc' palette change entries in the index until a logic
1633  * to process these is properly implemented. */
1634  if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1635  continue;
1636 
1637  if (first_packet && first_packet_pos) {
1638  if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1639  data_offset = first_packet_pos - pos;
1640  first_packet = 0;
1641  }
1642  pos += data_offset;
1643 
1644  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1645 
1646  // even if we have only a single stream, we should
1647  // switch to non-interleaved to get correct timestamps
1648  if (last_pos == pos)
1649  avi->non_interleaved = 1;
1650  if (last_idx != pos && len) {
1651  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1652  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1653  last_idx= pos;
1654  }
1655  ast->cum_len += get_duration(ast, len);
1656  last_pos = pos;
1657  anykey |= flags&AVIIF_INDEX;
1658  }
1659  if (!anykey) {
1660  for (index = 0; index < s->nb_streams; index++) {
1661  st = s->streams[index];
1662  if (st->nb_index_entries)
1664  }
1665  }
1666  return 0;
1667 }
1668 
1669 /* Scan the index and consider any file with streams more than
1670  * 2 seconds or 64MB apart non-interleaved. */
1672 {
1673  int64_t min_pos, pos;
1674  int i;
1675  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1676  if (!idx)
1677  return AVERROR(ENOMEM);
1678  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1679  int64_t max_dts = INT64_MIN / 2;
1680  int64_t min_dts = INT64_MAX / 2;
1681  int64_t max_buffer = 0;
1682 
1683  min_pos = INT64_MAX;
1684 
1685  for (i = 0; i < s->nb_streams; i++) {
1686  AVStream *st = s->streams[i];
1687  AVIStream *ast = st->priv_data;
1688  int n = st->nb_index_entries;
1689  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1690  idx[i]++;
1691  if (idx[i] < n) {
1692  int64_t dts;
1693  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1694  FFMAX(ast->sample_size, 1),
1695  st->time_base, AV_TIME_BASE_Q);
1696  min_dts = FFMIN(min_dts, dts);
1697  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1698  }
1699  }
1700  for (i = 0; i < s->nb_streams; i++) {
1701  AVStream *st = s->streams[i];
1702  AVIStream *ast = st->priv_data;
1703 
1704  if (idx[i] && min_dts != INT64_MAX / 2) {
1705  int64_t dts, delta_dts;
1706  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1707  FFMAX(ast->sample_size, 1),
1708  st->time_base, AV_TIME_BASE_Q);
1709  delta_dts = av_sat_sub64(dts, min_dts);
1710  max_dts = FFMAX(max_dts, dts);
1711  max_buffer = FFMAX(max_buffer,
1712  av_rescale(delta_dts,
1713  st->codecpar->bit_rate,
1714  AV_TIME_BASE));
1715  }
1716  }
1717  if (av_sat_sub64(max_dts, min_dts) > 2 * AV_TIME_BASE ||
1718  max_buffer > 1024 * 1024 * 8 * 8) {
1719  av_free(idx);
1720  return 1;
1721  }
1722  }
1723  av_free(idx);
1724  return 0;
1725 }
1726 
1728 {
1729  int i;
1730  int64_t last_start = 0;
1731  int64_t first_end = INT64_MAX;
1732  int64_t oldpos = avio_tell(s->pb);
1733 
1734  for (i = 0; i < s->nb_streams; i++) {
1735  AVStream *st = s->streams[i];
1736  int n = st->nb_index_entries;
1737  unsigned int size;
1738 
1739  if (n <= 0)
1740  continue;
1741 
1742  if (n >= 2) {
1743  int64_t pos = st->index_entries[0].pos;
1744  unsigned tag[2];
1745  avio_seek(s->pb, pos, SEEK_SET);
1746  tag[0] = avio_r8(s->pb);
1747  tag[1] = avio_r8(s->pb);
1748  avio_rl16(s->pb);
1749  size = avio_rl32(s->pb);
1750  if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1751  last_start = INT64_MAX;
1752  if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1753  last_start = INT64_MAX;
1754  }
1755 
1756  if (st->index_entries[0].pos > last_start)
1757  last_start = st->index_entries[0].pos;
1758  if (st->index_entries[n - 1].pos < first_end)
1759  first_end = st->index_entries[n - 1].pos;
1760  }
1761  avio_seek(s->pb, oldpos, SEEK_SET);
1762 
1763  if (last_start > first_end)
1764  return 1;
1765 
1766  return check_stream_max_drift(s);
1767 }
1768 
1770 {
1771  AVIContext *avi = s->priv_data;
1772  AVIOContext *pb = s->pb;
1773  uint32_t tag, size;
1774  int64_t pos = avio_tell(pb);
1775  int64_t next;
1776  int ret = -1;
1777 
1778  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1779  goto the_end; // maybe truncated file
1780  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1781  for (;;) {
1782  tag = avio_rl32(pb);
1783  size = avio_rl32(pb);
1784  if (avio_feof(pb))
1785  break;
1786  next = avio_tell(pb) + size + (size & 1);
1787 
1788  if (tag == MKTAG('i', 'd', 'x', '1') &&
1789  avi_read_idx1(s, size) >= 0) {
1790  avi->index_loaded=2;
1791  ret = 0;
1792  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1793  uint32_t tag1 = avio_rl32(pb);
1794 
1795  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1796  ff_read_riff_info(s, size - 4);
1797  }else if (!ret)
1798  break;
1799 
1800  if (avio_seek(pb, next, SEEK_SET) < 0)
1801  break; // something is wrong here
1802  }
1803 
1804 the_end:
1805  avio_seek(pb, pos, SEEK_SET);
1806  return ret;
1807 }
1808 
1809 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1810 {
1811  AVIStream *ast2 = st2->priv_data;
1812  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1813  av_packet_unref(ast2->sub_pkt);
1814  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1815  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1816  ff_read_packet(ast2->sub_ctx, ast2->sub_pkt);
1817 }
1818 
1819 static int avi_read_seek(AVFormatContext *s, int stream_index,
1820  int64_t timestamp, int flags)
1821 {
1822  AVIContext *avi = s->priv_data;
1823  AVStream *st;
1824  int i, index;
1825  int64_t pos, pos_min;
1826  AVIStream *ast;
1827 
1828  /* Does not matter which stream is requested dv in avi has the
1829  * stream information in the first video stream.
1830  */
1831  if (avi->dv_demux)
1832  stream_index = 0;
1833 
1834  if (!avi->index_loaded) {
1835  /* we only load the index on demand */
1836  avi_load_index(s);
1837  avi->index_loaded |= 1;
1838  }
1839  av_assert0(stream_index >= 0);
1840 
1841  st = s->streams[stream_index];
1842  ast = st->priv_data;
1844  timestamp * FFMAX(ast->sample_size, 1),
1845  flags);
1846  if (index < 0) {
1847  if (st->nb_index_entries > 0)
1848  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1849  timestamp * FFMAX(ast->sample_size, 1),
1850  st->index_entries[0].timestamp,
1852  return AVERROR_INVALIDDATA;
1853  }
1854 
1855  /* find the position */
1856  pos = st->index_entries[index].pos;
1857  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1858 
1859  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1860  timestamp, index, st->index_entries[index].timestamp);
1861 
1862  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1863  /* One and only one real stream for DV in AVI, and it has video */
1864  /* offsets. Calling with other stream indexes should have failed */
1865  /* the av_index_search_timestamp call above. */
1866 
1867  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1868  return -1;
1869 
1870  /* Feed the DV video stream version of the timestamp to the */
1871  /* DV demux so it can synthesize correct timestamps. */
1872  ff_dv_offset_reset(avi->dv_demux, timestamp);
1873 
1874  avi->stream_index = -1;
1875  return 0;
1876  }
1877 
1878  pos_min = pos;
1879  for (i = 0; i < s->nb_streams; i++) {
1880  AVStream *st2 = s->streams[i];
1881  AVIStream *ast2 = st2->priv_data;
1882 
1883  ast2->packet_size =
1884  ast2->remaining = 0;
1885 
1886  if (ast2->sub_ctx) {
1887  seek_subtitle(st, st2, timestamp);
1888  continue;
1889  }
1890 
1891  if (st2->nb_index_entries <= 0)
1892  continue;
1893 
1894 // av_assert1(st2->codecpar->block_align);
1896  av_rescale_q(timestamp,
1897  st->time_base,
1898  st2->time_base) *
1899  FFMAX(ast2->sample_size, 1),
1900  flags |
1903  if (index < 0)
1904  index = 0;
1905  ast2->seek_pos = st2->index_entries[index].pos;
1906  pos_min = FFMIN(pos_min,ast2->seek_pos);
1907  }
1908  for (i = 0; i < s->nb_streams; i++) {
1909  AVStream *st2 = s->streams[i];
1910  AVIStream *ast2 = st2->priv_data;
1911 
1912  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1913  continue;
1914 
1916  st2,
1917  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1919  if (index < 0)
1920  index = 0;
1921  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1922  index--;
1923  ast2->frame_offset = st2->index_entries[index].timestamp;
1924  }
1925 
1926  /* do the seek */
1927  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1928  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1929  return -1;
1930  }
1931  avi->stream_index = -1;
1932  avi->dts_max = INT_MIN;
1933  return 0;
1934 }
1935 
1937 {
1938  int i;
1939  AVIContext *avi = s->priv_data;
1940 
1941  for (i = 0; i < s->nb_streams; i++) {
1942  AVStream *st = s->streams[i];
1943  AVIStream *ast = st->priv_data;
1944  if (ast) {
1945  if (ast->sub_ctx) {
1946  av_freep(&ast->sub_ctx->pb);
1948  }
1949  av_buffer_unref(&ast->sub_buffer);
1950  av_packet_free(&ast->sub_pkt);
1951  }
1952  }
1953 
1954  av_freep(&avi->dv_demux);
1955 
1956  return 0;
1957 }
1958 
1959 static int avi_probe(const AVProbeData *p)
1960 {
1961  int i;
1962 
1963  /* check file header */
1964  for (i = 0; avi_headers[i][0]; i++)
1965  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1966  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1967  return AVPROBE_SCORE_MAX;
1968 
1969  return 0;
1970 }
1971 
1973  .name = "avi",
1974  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1975  .priv_data_size = sizeof(AVIContext),
1976  .extensions = "avi",
1977  .read_probe = avi_probe,
1982  .priv_class = &demuxer_class,
1983 };
#define U(x)
Definition: vp56_arith.h:37
uint8_t
static int64_t fsize(FILE *f)
Definition: audiomatch.c:29
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1656
Main libavformat public API header.
#define AVFMT_FLAG_SORT_DTS
try to interleave outputted packets by dts (using this flag can slow demuxing down)
Definition: avformat.h:1384
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:455
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1365
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2417
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:310
#define ff_const59
The ff_const59 define is not part of the public API and will be removed without further warning.
Definition: avformat.h:533
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2415
@ AVSTREAM_PARSE_TIMESTAMPS
full parsing and interpolation of timestamps for frames not starting on a packet boundary
Definition: avformat.h:796
@ AVSTREAM_PARSE_HEADERS
Only parse headers, do not repack.
Definition: avformat.h:795
@ AVSTREAM_PARSE_FULL
full parsing and repack
Definition: avformat.h:794
@ AVSTREAM_PARSE_NONE
Definition: avformat.h:793
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AVIIF_INDEX
Definition: avi.h:38
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
Definition: avidec.c:304
static AVStream * get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt)
Definition: avidec.c:1165
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1819
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:1213
static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
Definition: avidec.c:395
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1769
static const AVOption options[]
Definition: avidec.c:88
#define MAX_ODML_DEPTH
Definition: avidec.c:83
static int get_riff(AVFormatContext *s, AVIOContext *pb)
Definition: avidec.c:143
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
Definition: avidec.c:333
static int avi_read_idx1(AVFormatContext *s, int size)
Definition: avidec.c:1583
static int get_duration(AVIStream *ast, int len)
Definition: avidec.c:133
static int check_stream_max_drift(AVFormatContext *s)
Definition: avidec.c:1671
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:111
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
Definition: avidec.c:352
static int calculate_bitrate(AVFormatContext *s)
Definition: avidec.c:433
static const AVClass demuxer_class
Definition: avidec.c:93
static int avi_probe(const AVProbeData *p)
Definition: avidec.c:1959
#define print_tag(s, str, tag, size)
Definition: avidec.c:129
static const char avi_headers[][8]
Definition: avidec.c:102
static int ni_prepare_read(AVFormatContext *s)
Definition: avidec.c:1366
#define RETURN_ERROR(code)
Definition: avidec.c:477
static int read_odml_index(AVFormatContext *s, int frame_num)
Definition: avidec.c:168
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1972
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1936
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:478
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
Definition: avidec.c:1809
static int get_stream_idx(const unsigned *d)
Definition: avidec.c:1199
static void clean_index(AVFormatContext *s)
Definition: avidec.c:276
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1727
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
Definition: avidec.c:1087
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avidec.c:1435
static const char months[12][4]
Definition: avidec.c:330
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:342
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 avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
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:138
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:155
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:781
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:758
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, buffer_size_t size)
Definition: avpacket.c:343
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RL32
Definition: intreadwrite.h:146
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
static struct @321 state
#define fail()
Definition: checkasm.h:133
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: codec_par.c:72
#define FFMIN(a, b)
Definition: common.h:105
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define av_sat_sub64
Definition: common.h:167
#define FFMAX(a, b)
Definition: common.h:103
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define CONFIG_DV_DEMUXER
Definition: config.h:2231
#define NULL
Definition: coverity.c:32
#define max(a, b)
Definition: cuda_runtime.h:33
Public dictionary API.
double value
Definition: eval.c:98
int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size, int le, int depth, AVDictionary **metadata)
Recursively decodes all IFD's and adds included TAGS into the metadata dictionary.
Definition: exif.c:137
EXIF metadata parser.
static int nb_streams
Definition: ffprobe.c:283
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
@ AV_CODEC_ID_XSUB
Definition: codec_id.h:526
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AV_CODEC_ID_ADPCM_IMA_AMV
Definition: codec_id.h:372
@ AV_CODEC_ID_MP2
Definition: codec_id.h:424
@ AV_CODEC_ID_RV40
Definition: codec_id.h:118
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:223
@ AV_CODEC_ID_AAC
Definition: codec_id.h:426
@ AV_CODEC_ID_XAN_DPCM
Definition: codec_id.h:416
@ AV_CODEC_ID_FLAC
Definition: codec_id.h:436
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:61
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:56
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:425
@ AV_CODEC_ID_MPEG1VIDEO
Definition: codec_id.h:50
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:51
@ AV_CODEC_ID_AMV
Definition: codec_id.h:156
@ AV_CODEC_ID_AVRN
Definition: codec_id.h:259
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding.
Definition: avcodec.h:215
@ AVDISCARD_ALL
discard all
Definition: avcodec.h:236
@ AVDISCARD_DEFAULT
discard useless packets like 0 size packets in avi
Definition: avcodec.h:231
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:690
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
@ AV_PKT_DATA_PALETTE
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette.
Definition: packet.h:46
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:211
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
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:2510
ff_const59 AVInputFormat * av_probe_input_format2(ff_const59 AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:205
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4477
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:512
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:2011
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2128
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:125
#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:74
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
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
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AVERROR_DEMUXER_NOT_FOUND
Demuxer not found.
Definition: error.h:53
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:220
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
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
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
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
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:161
void * av_mallocz_array(size_t nmemb, size_t size)
Allocate a memory block for an array with av_mallocz().
Definition: mem.c:190
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ AVMEDIA_TYPE_DATA
Opaque data information usually continuous.
Definition: avutil.h:203
@ AVMEDIA_TYPE_UNKNOWN
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:215
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int index
Definition: gxfenc.c:89
const char * key
int i
Definition: input.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
const AVCodecTag ff_codec_movvideo_tags[]
Definition: isom_tags.c:29
common internal api header.
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
#define ff_tlog(ctx,...)
Definition: internal.h:91
int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, uint8_t *buf, int buf_size, int64_t pos)
Definition: dv.c:371
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:338
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
Definition: dv.c:354
void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
Definition: dv.c:439
static int resync(AVFormatContext *s)
Definition: flvdec.c:970
void ff_free_stream(AVFormatContext *s, AVStream *st)
Definition: utils.c:4424
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:160
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:4941
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:3330
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:811
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3129
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:59
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
const char * desc
Definition: libsvtav1.c:79
static void handler(vbi_event *ev, void *user_data)
@ AV_CLASS_CATEGORY_DEMUXER
Definition: log.h:34
uint32_t tag
Definition: movenc.c:1600
const char data[16]
Definition: mxf.c:142
AVOptions.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:279
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
const char * name
Definition: qsvenc.c:46
const AVCodecTag ff_codec_bmp_tags_unofficial[]
Definition: riff.c:502
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:33
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:603
internal header for RIFF based (de)muxers do NOT include this in end user applications
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
Read BITMAPINFOHEADER structure and set AVStream codec width, height and bits_per_encoded_sample fiel...
Definition: riffdec.c:209
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:91
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:228
enum AVMediaType codec_type
Definition: rtp.c:37
static const uint8_t header[24]
Definition: sdr2.c:67
static char buffer[20]
Definition: seek.c:32
#define snprintf
Definition: snprintf.h:34
unsigned int pos
Definition: spdifenc.c:412
A reference to a data buffer.
Definition: buffer.h:84
Describe the class of an AVClass context structure.
Definition: log.h:67
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
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int width
Video only.
Definition: codec_par.h:126
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int block_align
Audio only.
Definition: codec_par.h:177
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
char * value
Definition: dict.h:83
Format I/O context.
Definition: avformat.h:1232
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1288
AVIOContext * pb
I/O context.
Definition: avformat.h:1274
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1300
int64_t last_pkt_pos
Definition: avidec.c:75
int stream_index
Definition: avidec.c:79
int64_t movi_list
Definition: avidec.c:74
int64_t riff_end
Definition: avidec.c:70
DVDemuxContext * dv_demux
Definition: avidec.c:80
int64_t dts_max
Definition: avidec.c:84
int odml_depth
Definition: avidec.c:81
int non_interleaved
Definition: avidec.c:78
int index_loaded
Definition: avidec.c:76
int64_t io_fsize
Definition: avidec.c:73
int64_t fsize
Definition: avidec.c:72
int64_t movi_end
Definition: avidec.c:71
int use_odml
Definition: avidec.c:82
int is_odml
Definition: avidec.c:77
Bytestream IO Context.
Definition: avio.h:161
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:229
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:228
int error
contains the error code or 0 if no error happened
Definition: avio.h:245
int has_pal
Definition: avidec.c:57
uint32_t handler
Definition: avidec.c:47
int remaining
Definition: avidec.c:44
int dshow_block_align
Definition: avidec.c:58
int64_t frame_offset
Definition: avidec.c:42
int sample_size
Definition: avidec.c:50
uint32_t rate
Definition: avidec.c:49
uint32_t scale
Definition: avidec.c:48
uint32_t pal[256]
Definition: avidec.c:56
int packet_size
Definition: avidec.c:45
AVPacket * sub_pkt
Definition: avidec.c:62
int prefix_count
Definition: avidec.c:55
AVBufferRef * sub_buffer
Definition: avidec.c:63
int64_t seek_pos
Definition: avidec.c:65
AVFormatContext * sub_ctx
Definition: avidec.c:61
int64_t cum_len
Definition: avidec.c:53
int prefix
Definition: avidec.c:54
int64_t pos
Definition: avformat.h:804
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:805
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:352
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int size
Definition: packet.h:370
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:368
uint8_t * data
Definition: packet.h:369
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: internal.h:248
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:935
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:928
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
AVDictionary * metadata
Definition: avformat.h:937
void * priv_data
Definition: avformat.h:888
int id
Format-specific stream ID.
Definition: avformat.h:880
int index
stream index in AVFormatContext
Definition: avformat.h:874
int nb_index_entries
Definition: avformat.h:1092
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:946
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:902
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1090
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1113
#define av_free(p)
#define avpriv_request_sample(...)
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
static void error(const char *err)
int64_t bitrate
Definition: h264_levels.c:131
int64_t duration
Definition: movenc.c:64
AVPacket * pkt
Definition: movenc.c:59
int size
if(ret< 0)
Definition: vf_mcdeint.c:282
static const uint8_t offset[127][2]
Definition: vf_spp.c:107
int len
uint8_t base
Definition: vp3data.h:141