FFmpeg  4.3
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  { 0 },
114 };
115 
116 static int avi_load_index(AVFormatContext *s);
117 static int guess_ni_flag(AVFormatContext *s);
118 
119 #define print_tag(s, str, tag, size) \
120  av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
121  avio_tell(pb), str, av_fourcc2str(tag), size) \
122 
123 static inline int get_duration(AVIStream *ast, int len)
124 {
125  if (ast->sample_size)
126  return len;
127  else if (ast->dshow_block_align)
128  return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
129  else
130  return 1;
131 }
132 
134 {
135  AVIContext *avi = s->priv_data;
136  char header[8] = {0};
137  int i;
138 
139  /* check RIFF header */
140  avio_read(pb, header, 4);
141  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
142  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
143  avio_read(pb, header + 4, 4);
144 
145  for (i = 0; avi_headers[i][0]; i++)
146  if (!memcmp(header, avi_headers[i], 8))
147  break;
148  if (!avi_headers[i][0])
149  return AVERROR_INVALIDDATA;
150 
151  if (header[7] == 0x19)
152  av_log(s, AV_LOG_INFO,
153  "This file has been generated by a totally broken muxer.\n");
154 
155  return 0;
156 }
157 
158 static int read_odml_index(AVFormatContext *s, int frame_num)
159 {
160  AVIContext *avi = s->priv_data;
161  AVIOContext *pb = s->pb;
162  int longs_per_entry = avio_rl16(pb);
163  int index_sub_type = avio_r8(pb);
164  int index_type = avio_r8(pb);
165  int entries_in_use = avio_rl32(pb);
166  int chunk_id = avio_rl32(pb);
167  int64_t base = avio_rl64(pb);
168  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
169  ((chunk_id >> 8 & 0xFF) - '0');
170  AVStream *st;
171  AVIStream *ast;
172  int i;
173  int64_t last_pos = -1;
174  int64_t filesize = avi->fsize;
175 
176  av_log(s, AV_LOG_TRACE,
177  "longs_per_entry:%d index_type:%d entries_in_use:%d "
178  "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
179  longs_per_entry,
180  index_type,
181  entries_in_use,
182  chunk_id,
183  base,
184  frame_num);
185 
186  if (stream_id >= s->nb_streams || stream_id < 0)
187  return AVERROR_INVALIDDATA;
188  st = s->streams[stream_id];
189  ast = st->priv_data;
190 
191  if (index_sub_type)
192  return AVERROR_INVALIDDATA;
193 
194  avio_rl32(pb);
195 
196  if (index_type && longs_per_entry != 2)
197  return AVERROR_INVALIDDATA;
198  if (index_type > 1)
199  return AVERROR_INVALIDDATA;
200 
201  if (filesize > 0 && base >= filesize) {
202  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
203  if (base >> 32 == (base & 0xFFFFFFFF) &&
204  (base & 0xFFFFFFFF) < filesize &&
205  filesize <= 0xFFFFFFFF)
206  base &= 0xFFFFFFFF;
207  else
208  return AVERROR_INVALIDDATA;
209  }
210 
211  for (i = 0; i < entries_in_use; i++) {
212  if (index_type) {
213  int64_t pos = avio_rl32(pb) + base - 8;
214  int len = avio_rl32(pb);
215  int key = len >= 0;
216  len &= 0x7FFFFFFF;
217 
218  av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
219 
220  if (avio_feof(pb))
221  return AVERROR_INVALIDDATA;
222 
223  if (last_pos == pos || pos == base - 8)
224  avi->non_interleaved = 1;
225  if (last_pos != pos && len)
226  av_add_index_entry(st, pos, ast->cum_len, len, 0,
227  key ? AVINDEX_KEYFRAME : 0);
228 
229  ast->cum_len += get_duration(ast, len);
230  last_pos = pos;
231  } else {
232  int64_t offset, pos;
233  int duration;
234  offset = avio_rl64(pb);
235  avio_rl32(pb); /* size */
236  duration = avio_rl32(pb);
237 
238  if (avio_feof(pb))
239  return AVERROR_INVALIDDATA;
240 
241  pos = avio_tell(pb);
242 
243  if (avi->odml_depth > MAX_ODML_DEPTH) {
244  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
245  return AVERROR_INVALIDDATA;
246  }
247 
248  if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
249  return -1;
250  avi->odml_depth++;
251  read_odml_index(s, frame_num);
252  avi->odml_depth--;
253  frame_num += duration;
254 
255  if (avio_seek(pb, pos, SEEK_SET) < 0) {
256  av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
257  return -1;
258  }
259 
260  }
261  }
262  avi->index_loaded = 2;
263  return 0;
264 }
265 
267 {
268  int i;
269  int64_t j;
270 
271  for (i = 0; i < s->nb_streams; i++) {
272  AVStream *st = s->streams[i];
273  AVIStream *ast = st->priv_data;
274  int n = st->nb_index_entries;
275  int max = ast->sample_size;
276  int64_t pos, size, ts;
277 
278  if (n != 1 || ast->sample_size == 0)
279  continue;
280 
281  while (max < 1024)
282  max += max;
283 
284  pos = st->index_entries[0].pos;
285  size = st->index_entries[0].size;
286  ts = st->index_entries[0].timestamp;
287 
288  for (j = 0; j < size; j += max)
289  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
291  }
292 }
293 
294 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
295  uint32_t size)
296 {
297  AVIOContext *pb = s->pb;
298  char key[5] = { 0 };
299  char *value;
300 
301  size += (size & 1);
302 
303  if (size == UINT_MAX)
304  return AVERROR(EINVAL);
305  value = av_malloc(size + 1);
306  if (!value)
307  return AVERROR(ENOMEM);
308  if (avio_read(pb, value, size) != size) {
309  av_freep(&value);
310  return AVERROR_INVALIDDATA;
311  }
312  value[size] = 0;
313 
314  AV_WL32(key, tag);
315 
316  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
318 }
319 
320 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
321  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
322 
323 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
324 {
325  char month[4], time[9], buffer[64];
326  int i, day, year;
327  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
328  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
329  month, &day, time, &year) == 4) {
330  for (i = 0; i < 12; i++)
331  if (!av_strcasecmp(month, months[i])) {
332  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
333  year, i + 1, day, time);
334  av_dict_set(metadata, "creation_time", buffer, 0);
335  }
336  } else if (date[4] == '/' && date[7] == '/') {
337  date[4] = date[7] = '-';
338  av_dict_set(metadata, "creation_time", date, 0);
339  }
340 }
341 
342 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
343 {
344  while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
345  uint32_t tag = avio_rl32(s->pb);
346  uint32_t size = avio_rl32(s->pb);
347  switch (tag) {
348  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
349  {
350  uint64_t tag_end = avio_tell(s->pb) + size;
351  while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
352  uint16_t tag = avio_rl16(s->pb);
353  uint16_t size = avio_rl16(s->pb);
354  const char *name = NULL;
355  char buffer[64] = { 0 };
356  size = FFMIN(size, tag_end - avio_tell(s->pb));
357  size -= avio_read(s->pb, buffer,
358  FFMIN(size, sizeof(buffer) - 1));
359  switch (tag) {
360  case 0x03:
361  name = "maker";
362  break;
363  case 0x04:
364  name = "model";
365  break;
366  case 0x13:
367  name = "creation_time";
368  if (buffer[4] == ':' && buffer[7] == ':')
369  buffer[4] = buffer[7] = '-';
370  break;
371  }
372  if (name)
373  av_dict_set(&s->metadata, name, buffer, 0);
374  avio_skip(s->pb, size);
375  }
376  break;
377  }
378  default:
379  avio_skip(s->pb, size);
380  break;
381  }
382  }
383 }
384 
386 {
387  GetByteContext gb;
388  uint8_t *data = st->codecpar->extradata;
389  int data_size = st->codecpar->extradata_size;
390  int tag, offset;
391 
392  if (!data || data_size < 8) {
393  return AVERROR_INVALIDDATA;
394  }
395 
396  bytestream2_init(&gb, data, data_size);
397 
398  tag = bytestream2_get_le32(&gb);
399 
400  switch (tag) {
401  case MKTAG('A', 'V', 'I', 'F'):
402  // skip 4 byte padding
403  bytestream2_skip(&gb, 4);
404  offset = bytestream2_tell(&gb);
405 
406  // decode EXIF tags from IFD, AVI is always little-endian
407  return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
408  1, 0, &st->metadata);
409  break;
410  case MKTAG('C', 'A', 'S', 'I'):
411  avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
412  break;
413  case MKTAG('Z', 'o', 'r', 'a'):
414  avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
415  break;
416  default:
417  break;
418  }
419 
420  return 0;
421 }
422 
424 {
425  AVIContext *avi = s->priv_data;
426  int i, j;
427  int64_t lensum = 0;
428  int64_t maxpos = 0;
429 
430  for (i = 0; i<s->nb_streams; i++) {
431  int64_t len = 0;
432  AVStream *st = s->streams[i];
433 
434  if (!st->nb_index_entries)
435  continue;
436 
437  for (j = 0; j < st->nb_index_entries; j++)
438  len += st->index_entries[j].size;
439  maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
440  lensum += len;
441  }
442  if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
443  return 0;
444  if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
445  return 0;
446 
447  for (i = 0; i<s->nb_streams; i++) {
448  int64_t len = 0;
449  AVStream *st = s->streams[i];
450  int64_t duration;
451  int64_t bitrate;
452 
453  for (j = 0; j < st->nb_index_entries; j++)
454  len += st->index_entries[j].size;
455 
456  if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
457  continue;
458  duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
459  bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
460  if (bitrate > 0) {
461  st->codecpar->bit_rate = bitrate;
462  }
463  }
464  return 1;
465 }
466 
468 {
469  AVIContext *avi = s->priv_data;
470  AVIOContext *pb = s->pb;
471  unsigned int tag, tag1, handler;
472  int codec_type, stream_index, frame_period;
473  unsigned int size;
474  int i;
475  AVStream *st;
476  AVIStream *ast = NULL;
477  int avih_width = 0, avih_height = 0;
478  int amv_file_format = 0;
479  uint64_t list_end = 0;
480  int64_t pos;
481  int ret;
482  AVDictionaryEntry *dict_entry;
483 
484  avi->stream_index = -1;
485 
486  ret = get_riff(s, pb);
487  if (ret < 0)
488  return ret;
489 
490  av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
491 
492  avi->io_fsize = avi->fsize = avio_size(pb);
493  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
494  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
495 
496  /* first list tag */
497  stream_index = -1;
498  codec_type = -1;
499  frame_period = 0;
500  for (;;) {
501  if (avio_feof(pb))
502  goto fail;
503  tag = avio_rl32(pb);
504  size = avio_rl32(pb);
505 
506  print_tag(s, "tag", tag, size);
507 
508  switch (tag) {
509  case MKTAG('L', 'I', 'S', 'T'):
510  list_end = avio_tell(pb) + size;
511  /* Ignored, except at start of video packets. */
512  tag1 = avio_rl32(pb);
513 
514  print_tag(s, "list", tag1, 0);
515 
516  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
517  avi->movi_list = avio_tell(pb) - 4;
518  if (size)
519  avi->movi_end = avi->movi_list + size + (size & 1);
520  else
521  avi->movi_end = avi->fsize;
522  av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
523  goto end_of_header;
524  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
525  ff_read_riff_info(s, size - 4);
526  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
527  avi_read_nikon(s, list_end);
528 
529  break;
530  case MKTAG('I', 'D', 'I', 'T'):
531  {
532  unsigned char date[64] = { 0 };
533  size += (size & 1);
534  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
535  avio_skip(pb, size);
537  break;
538  }
539  case MKTAG('d', 'm', 'l', 'h'):
540  avi->is_odml = 1;
541  avio_skip(pb, size + (size & 1));
542  break;
543  case MKTAG('a', 'm', 'v', 'h'):
544  amv_file_format = 1;
545  case MKTAG('a', 'v', 'i', 'h'):
546  /* AVI header */
547  /* using frame_period is bad idea */
548  frame_period = avio_rl32(pb);
549  avio_rl32(pb); /* max. bytes per second */
550  avio_rl32(pb);
552 
553  avio_skip(pb, 2 * 4);
554  avio_rl32(pb);
555  avio_rl32(pb);
556  avih_width = avio_rl32(pb);
557  avih_height = avio_rl32(pb);
558 
559  avio_skip(pb, size - 10 * 4);
560  break;
561  case MKTAG('s', 't', 'r', 'h'):
562  /* stream header */
563 
564  tag1 = avio_rl32(pb);
565  handler = avio_rl32(pb); /* codec tag */
566 
567  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
568  avio_skip(pb, size - 8);
569  break;
570  } else {
571  stream_index++;
572  st = avformat_new_stream(s, NULL);
573  if (!st)
574  goto fail;
575 
576  st->id = stream_index;
577  ast = av_mallocz(sizeof(AVIStream));
578  if (!ast)
579  goto fail;
580  st->priv_data = ast;
581  }
582  if (amv_file_format)
583  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
584  : MKTAG('v', 'i', 'd', 's');
585 
586  print_tag(s, "strh", tag1, -1);
587 
588  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
589  tag1 == MKTAG('i', 'v', 'a', 's')) {
590  int64_t dv_dur;
591 
592  /* After some consideration -- I don't think we
593  * have to support anything but DV in type1 AVIs. */
594  if (s->nb_streams != 1)
595  goto fail;
596 
597  if (handler != MKTAG('d', 'v', 's', 'd') &&
598  handler != MKTAG('d', 'v', 'h', 'd') &&
599  handler != MKTAG('d', 'v', 's', 'l'))
600  goto fail;
601 
602  if (!CONFIG_DV_DEMUXER)
604 
605  ast = s->streams[0]->priv_data;
606  st->priv_data = NULL;
607  ff_free_stream(s, st);
608 
609  avi->dv_demux = avpriv_dv_init_demux(s);
610  if (!avi->dv_demux) {
611  av_free(ast);
612  return AVERROR(ENOMEM);
613  }
614 
615  s->streams[0]->priv_data = ast;
616  avio_skip(pb, 3 * 4);
617  ast->scale = avio_rl32(pb);
618  ast->rate = avio_rl32(pb);
619  avio_skip(pb, 4); /* start time */
620 
621  dv_dur = avio_rl32(pb);
622  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
623  dv_dur *= AV_TIME_BASE;
624  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
625  }
626  /* else, leave duration alone; timing estimation in utils.c
627  * will make a guess based on bitrate. */
628 
629  stream_index = s->nb_streams - 1;
630  avio_skip(pb, size - 9 * 4);
631  break;
632  }
633 
634  av_assert0(stream_index < s->nb_streams);
635  ast->handler = handler;
636 
637  avio_rl32(pb); /* flags */
638  avio_rl16(pb); /* priority */
639  avio_rl16(pb); /* language */
640  avio_rl32(pb); /* initial frame */
641  ast->scale = avio_rl32(pb);
642  ast->rate = avio_rl32(pb);
643  if (!(ast->scale && ast->rate)) {
645  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
646  "(This file has been generated by broken software.)\n",
647  ast->scale,
648  ast->rate);
649  if (frame_period) {
650  ast->rate = 1000000;
651  ast->scale = frame_period;
652  } else {
653  ast->rate = 25;
654  ast->scale = 1;
655  }
656  }
657  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
658 
659  ast->cum_len = avio_rl32(pb); /* start */
660  st->nb_frames = avio_rl32(pb);
661 
662  st->start_time = 0;
663  avio_rl32(pb); /* buffer size */
664  avio_rl32(pb); /* quality */
665  if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
666  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
667  ast->cum_len = 0;
668  }
669  ast->sample_size = avio_rl32(pb);
670  ast->cum_len *= FFMAX(1, ast->sample_size);
671  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
672  ast->rate, ast->scale, ast->sample_size);
673 
674  switch (tag1) {
675  case MKTAG('v', 'i', 'd', 's'):
676  codec_type = AVMEDIA_TYPE_VIDEO;
677 
678  ast->sample_size = 0;
679  st->avg_frame_rate = av_inv_q(st->time_base);
680  break;
681  case MKTAG('a', 'u', 'd', 's'):
682  codec_type = AVMEDIA_TYPE_AUDIO;
683  break;
684  case MKTAG('t', 'x', 't', 's'):
685  codec_type = AVMEDIA_TYPE_SUBTITLE;
686  break;
687  case MKTAG('d', 'a', 't', 's'):
688  codec_type = AVMEDIA_TYPE_DATA;
689  break;
690  default:
691  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
692  }
693 
694  if (ast->sample_size < 0) {
695  if (s->error_recognition & AV_EF_EXPLODE) {
696  av_log(s, AV_LOG_ERROR,
697  "Invalid sample_size %d at stream %d\n",
698  ast->sample_size,
699  stream_index);
700  goto fail;
701  }
703  "Invalid sample_size %d at stream %d "
704  "setting it to 0\n",
705  ast->sample_size,
706  stream_index);
707  ast->sample_size = 0;
708  }
709 
710  if (ast->sample_size == 0) {
711  st->duration = st->nb_frames;
712  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
713  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
714  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
715  }
716  }
717  ast->frame_offset = ast->cum_len;
718  avio_skip(pb, size - 12 * 4);
719  break;
720  case MKTAG('s', 't', 'r', 'f'):
721  /* stream header */
722  if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
723  codec_type == AVMEDIA_TYPE_VIDEO))
724  break;
725  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
726  avio_skip(pb, size);
727  } else {
728  uint64_t cur_pos = avio_tell(pb);
729  unsigned esize;
730  if (cur_pos < list_end)
731  size = FFMIN(size, list_end - cur_pos);
732  st = s->streams[stream_index];
734  avio_skip(pb, size);
735  break;
736  }
737  switch (codec_type) {
738  case AVMEDIA_TYPE_VIDEO:
739  if (amv_file_format) {
740  st->codecpar->width = avih_width;
741  st->codecpar->height = avih_height;
744  avio_skip(pb, size);
745  break;
746  }
747  tag1 = ff_get_bmp_header(pb, st, &esize);
748 
749  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
750  tag1 == MKTAG('D', 'X', 'S', 'A')) {
752  st->codecpar->codec_tag = tag1;
754  break;
755  }
756 
757  if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
758  if (esize == size-1 && (esize&1)) {
759  st->codecpar->extradata_size = esize - 10 * 4;
760  } else
761  st->codecpar->extradata_size = size - 10 * 4;
762  if (st->codecpar->extradata) {
763  av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
764  }
765  ret = ff_get_extradata(s, st->codecpar, pb,
766  st->codecpar->extradata_size);
767  if (ret < 0)
768  return ret;
769  }
770 
771  // FIXME: check if the encoder really did this correctly
772  if (st->codecpar->extradata_size & 1)
773  avio_r8(pb);
774 
775  /* Extract palette from extradata if bpp <= 8.
776  * This code assumes that extradata contains only palette.
777  * This is true for all paletted codecs implemented in
778  * FFmpeg. */
779  if (st->codecpar->extradata_size &&
780  (st->codecpar->bits_per_coded_sample <= 8)) {
781  int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
782  const uint8_t *pal_src;
783 
784  pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
785  pal_src = st->codecpar->extradata +
786  st->codecpar->extradata_size - pal_size;
787  /* Exclude the "BottomUp" field from the palette */
788  if (pal_src - st->codecpar->extradata >= 9 &&
789  !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
790  pal_src -= 9;
791  for (i = 0; i < pal_size / 4; i++)
792  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
793  ast->has_pal = 1;
794  }
795 
796  print_tag(s, "video", tag1, 0);
797 
799  st->codecpar->codec_tag = tag1;
801  tag1);
802  /* If codec is not found yet, try with the mov tags. */
803  if (!st->codecpar->codec_id) {
804  st->codecpar->codec_id =
806  if (st->codecpar->codec_id)
808  "mov tag found in avi (fourcc %s)\n",
809  av_fourcc2str(tag1));
810  }
811  if (!st->codecpar->codec_id)
813 
814  /* This is needed to get the pict type which is necessary
815  * for generating correct pts. */
817 
818  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
819  ast->handler == MKTAG('X', 'V', 'I', 'D'))
820  st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
821 
822  if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
824  if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
826  if (st->codecpar->codec_id == AV_CODEC_ID_HEVC &&
827  st->codecpar->codec_tag == MKTAG('H', '2', '6', '5'))
829 
830  if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
831  st->codecpar->extradata_size < 1U << 30) {
832  st->codecpar->extradata_size += 9;
833  if ((ret = av_reallocp(&st->codecpar->extradata,
834  st->codecpar->extradata_size +
836  st->codecpar->extradata_size = 0;
837  return ret;
838  } else
839  memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
840  "BottomUp", 9);
841  }
842  st->codecpar->height = FFABS(st->codecpar->height);
843 
844 // avio_skip(pb, size - 5 * 4);
845  break;
846  case AVMEDIA_TYPE_AUDIO:
847  ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
848  if (ret < 0)
849  return ret;
851  if (ast->sample_size && st->codecpar->block_align &&
852  ast->sample_size != st->codecpar->block_align) {
853  av_log(s,
855  "sample size (%d) != block align (%d)\n",
856  ast->sample_size,
857  st->codecpar->block_align);
858  ast->sample_size = st->codecpar->block_align;
859  }
860  /* 2-aligned
861  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
862  if (size & 1)
863  avio_skip(pb, 1);
864  /* Force parsing as several audio frames can be in
865  * one packet and timestamps refer to packet start. */
867  /* ADTS header is in extradata, AAC without header must be
868  * stored as exact frames. Parser not needed and it will
869  * fail. */
870  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
873  // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
874  if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
876  /* AVI files with Xan DPCM audio (wrongly) declare PCM
877  * audio in the header but have Axan as stream_code_tag. */
878  if (ast->handler == AV_RL32("Axan")) {
880  st->codecpar->codec_tag = 0;
881  ast->dshow_block_align = 0;
882  }
883  if (amv_file_format) {
885  ast->dshow_block_align = 0;
886  }
887  if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
889  st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
890  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
891  ast->dshow_block_align = 0;
892  }
893  if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
894  st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
895  st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
896  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
897  ast->sample_size = 0;
898  }
899  break;
902  st->request_probe= 1;
903  avio_skip(pb, size);
904  break;
905  default:
908  st->codecpar->codec_tag = 0;
909  avio_skip(pb, size);
910  break;
911  }
912  }
913  break;
914  case MKTAG('s', 't', 'r', 'd'):
915  if (stream_index >= (unsigned)s->nb_streams
916  || s->streams[stream_index]->codecpar->extradata_size
917  || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
918  avio_skip(pb, size);
919  } else {
920  uint64_t cur_pos = avio_tell(pb);
921  if (cur_pos < list_end)
922  size = FFMIN(size, list_end - cur_pos);
923  st = s->streams[stream_index];
924 
925  if (size<(1<<30)) {
926  if (st->codecpar->extradata) {
927  av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
928  }
929  if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
930  return ret;
931  }
932 
933  if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
934  avio_r8(pb);
935 
936  ret = avi_extract_stream_metadata(s, st);
937  if (ret < 0) {
938  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
939  }
940  }
941  break;
942  case MKTAG('i', 'n', 'd', 'x'):
943  pos = avio_tell(pb);
944  if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
945  avi->use_odml &&
946  read_odml_index(s, 0) < 0 &&
948  goto fail;
949  avio_seek(pb, pos + size, SEEK_SET);
950  break;
951  case MKTAG('v', 'p', 'r', 'p'):
952  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
953  AVRational active, active_aspect;
954 
955  st = s->streams[stream_index];
956  avio_rl32(pb);
957  avio_rl32(pb);
958  avio_rl32(pb);
959  avio_rl32(pb);
960  avio_rl32(pb);
961 
962  active_aspect.den = avio_rl16(pb);
963  active_aspect.num = avio_rl16(pb);
964  active.num = avio_rl32(pb);
965  active.den = avio_rl32(pb);
966  avio_rl32(pb); // nbFieldsPerFrame
967 
968  if (active_aspect.num && active_aspect.den &&
969  active.num && active.den) {
970  st->sample_aspect_ratio = av_div_q(active_aspect, active);
971  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
972  active_aspect.num, active_aspect.den,
973  active.num, active.den);
974  }
975  size -= 9 * 4;
976  }
977  avio_skip(pb, size);
978  break;
979  case MKTAG('s', 't', 'r', 'n'):
980  if (s->nb_streams) {
981  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
982  if (ret < 0)
983  return ret;
984  break;
985  }
986  default:
987  if (size > 1000000) {
988  av_log(s, AV_LOG_ERROR,
989  "Something went wrong during header parsing, "
990  "tag %s has size %u, "
991  "I will ignore it and try to continue anyway.\n",
992  av_fourcc2str(tag), size);
994  goto fail;
995  avi->movi_list = avio_tell(pb) - 4;
996  avi->movi_end = avi->fsize;
997  goto end_of_header;
998  }
999  /* Do not fail for very large idx1 tags */
1000  case MKTAG('i', 'd', 'x', '1'):
1001  /* skip tag */
1002  size += (size & 1);
1003  avio_skip(pb, size);
1004  break;
1005  }
1006  }
1007 
1008 end_of_header:
1009  /* check stream number */
1010  if (stream_index != s->nb_streams - 1) {
1011 
1012 fail:
1013  return AVERROR_INVALIDDATA;
1014  }
1015 
1016  if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1017  avi_load_index(s);
1018  calculate_bitrate(s);
1019  avi->index_loaded |= 1;
1020 
1021  if ((ret = guess_ni_flag(s)) < 0)
1022  return ret;
1023 
1024  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1025 
1026  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1027  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1028  for (i = 0; i < s->nb_streams; i++) {
1029  AVStream *st = s->streams[i];
1033  }
1034 
1035  for (i = 0; i < s->nb_streams; i++) {
1036  AVStream *st = s->streams[i];
1037  if (st->nb_index_entries)
1038  break;
1039  }
1040  // DV-in-AVI cannot be non-interleaved, if set this must be
1041  // a mis-detection.
1042  if (avi->dv_demux)
1043  avi->non_interleaved = 0;
1044  if (i == s->nb_streams && avi->non_interleaved) {
1046  "Non-interleaved AVI without index, switching to interleaved\n");
1047  avi->non_interleaved = 0;
1048  }
1049 
1050  if (avi->non_interleaved) {
1051  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1052  clean_index(s);
1053  }
1054 
1055  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1057 
1058  return 0;
1059 }
1060 
1062 {
1063  if (pkt->size >= 7 &&
1064  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1065  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1066  uint8_t desc[256];
1067  int score = AVPROBE_SCORE_EXTENSION, ret;
1068  AVIStream *ast = st->priv_data;
1069  ff_const59 AVInputFormat *sub_demuxer;
1070  AVRational time_base;
1071  int size;
1072  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1073  pkt->size - 7,
1074  0, NULL, NULL, NULL, NULL);
1075  AVProbeData pd;
1076  unsigned int desc_len = avio_rl32(pb);
1077 
1078  if (desc_len > pb->buf_end - pb->buf_ptr)
1079  goto error;
1080 
1081  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1082  avio_skip(pb, desc_len - ret);
1083  if (*desc)
1084  av_dict_set(&st->metadata, "title", desc, 0);
1085 
1086  avio_rl16(pb); /* flags? */
1087  avio_rl32(pb); /* data size */
1088 
1089  size = pb->buf_end - pb->buf_ptr;
1090  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1091  .buf_size = size };
1092  if (!pd.buf)
1093  goto error;
1094  memcpy(pd.buf, pb->buf_ptr, size);
1095  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1096  av_freep(&pd.buf);
1097  if (!sub_demuxer)
1098  goto error;
1099 
1100  if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1101  goto error;
1102 
1103  if (!(ast->sub_ctx = avformat_alloc_context()))
1104  goto error;
1105 
1106  ast->sub_ctx->pb = pb;
1107 
1108  if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1109  goto error;
1110 
1111  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1112  if (ast->sub_ctx->nb_streams != 1)
1113  goto error;
1114  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1116  time_base = ast->sub_ctx->streams[0]->time_base;
1117  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1118  }
1119  ast->sub_buffer = pkt->buf;
1120  pkt->buf = NULL;
1121  av_packet_unref(pkt);
1122  return 1;
1123 
1124 error:
1125  av_freep(&ast->sub_ctx);
1126  avio_context_free(&pb);
1127  }
1128  return 0;
1129 }
1130 
1132  AVPacket *pkt)
1133 {
1134  AVIStream *ast, *next_ast = next_st->priv_data;
1135  int64_t ts, next_ts, ts_min = INT64_MAX;
1136  AVStream *st, *sub_st = NULL;
1137  int i;
1138 
1139  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1140  AV_TIME_BASE_Q);
1141 
1142  for (i = 0; i < s->nb_streams; i++) {
1143  st = s->streams[i];
1144  ast = st->priv_data;
1145  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1146  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1147  if (ts <= next_ts && ts < ts_min) {
1148  ts_min = ts;
1149  sub_st = st;
1150  }
1151  }
1152  }
1153 
1154  if (sub_st) {
1155  ast = sub_st->priv_data;
1156  *pkt = ast->sub_pkt;
1157  pkt->stream_index = sub_st->index;
1158 
1159  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1160  ast->sub_pkt.data = NULL;
1161  }
1162  return sub_st;
1163 }
1164 
1165 static int get_stream_idx(const unsigned *d)
1166 {
1167  if (d[0] >= '0' && d[0] <= '9' &&
1168  d[1] >= '0' && d[1] <= '9') {
1169  return (d[0] - '0') * 10 + (d[1] - '0');
1170  } else {
1171  return 100; // invalid stream ID
1172  }
1173 }
1174 
1175 /**
1176  *
1177  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1178  */
1179 static int avi_sync(AVFormatContext *s, int exit_early)
1180 {
1181  AVIContext *avi = s->priv_data;
1182  AVIOContext *pb = s->pb;
1183  int n;
1184  unsigned int d[8];
1185  unsigned int size;
1186  int64_t i, sync;
1187 
1188 start_sync:
1189  memset(d, -1, sizeof(d));
1190  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1191  int j;
1192 
1193  for (j = 0; j < 7; j++)
1194  d[j] = d[j + 1];
1195  d[7] = avio_r8(pb);
1196 
1197  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1198 
1199  n = get_stream_idx(d + 2);
1200  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1201  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1202  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1203  continue;
1204 
1205  // parse ix##
1206  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1207  // parse JUNK
1208  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1209  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1210  (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1211  avio_skip(pb, size);
1212  goto start_sync;
1213  }
1214 
1215  // parse stray LIST
1216  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1217  avio_skip(pb, 4);
1218  goto start_sync;
1219  }
1220 
1221  n = get_stream_idx(d);
1222 
1223  if (!((i - avi->last_pkt_pos) & 1) &&
1224  get_stream_idx(d + 1) < s->nb_streams)
1225  continue;
1226 
1227  // detect ##ix chunk and skip
1228  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1229  avio_skip(pb, size);
1230  goto start_sync;
1231  }
1232 
1233  if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1234  avio_skip(pb, 16 * 3 + 8);
1235  goto start_sync;
1236  }
1237 
1238  if (avi->dv_demux && n != 0)
1239  continue;
1240 
1241  // parse ##dc/##wb
1242  if (n < s->nb_streams) {
1243  AVStream *st;
1244  AVIStream *ast;
1245  st = s->streams[n];
1246  ast = st->priv_data;
1247 
1248  if (!ast) {
1249  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1250  continue;
1251  }
1252 
1253  if (s->nb_streams >= 2) {
1254  AVStream *st1 = s->streams[1];
1255  AVIStream *ast1 = st1->priv_data;
1256  // workaround for broken small-file-bug402.avi
1257  if ( d[2] == 'w' && d[3] == 'b'
1258  && n == 0
1259  && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1261  && ast->prefix == 'd'*256+'c'
1262  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1263  ) {
1264  n = 1;
1265  st = st1;
1266  ast = ast1;
1268  "Invalid stream + prefix combination, assuming audio.\n");
1269  }
1270  }
1271 
1272  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1273  int k = avio_r8(pb);
1274  int last = (k + avio_r8(pb) - 1) & 0xFF;
1275 
1276  avio_rl16(pb); // flags
1277 
1278  // b + (g << 8) + (r << 16);
1279  for (; k <= last; k++)
1280  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1281 
1282  ast->has_pal = 1;
1283  goto start_sync;
1284  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1285  d[2] < 128 && d[3] < 128) ||
1286  d[2] * 256 + d[3] == ast->prefix /* ||
1287  (d[2] == 'd' && d[3] == 'c') ||
1288  (d[2] == 'w' && d[3] == 'b') */) {
1289  if (exit_early)
1290  return 0;
1291  if (d[2] * 256 + d[3] == ast->prefix)
1292  ast->prefix_count++;
1293  else {
1294  ast->prefix = d[2] * 256 + d[3];
1295  ast->prefix_count = 0;
1296  }
1297 
1298  if (!avi->dv_demux &&
1299  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1300  // FIXME: needs a little reordering
1301  (st->discard >= AVDISCARD_NONKEY &&
1302  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1303  || st->discard >= AVDISCARD_ALL)) {
1304 
1305  ast->frame_offset += get_duration(ast, size);
1306  avio_skip(pb, size);
1307  goto start_sync;
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  pkt->stream_index = avi->stream_index;
1482 
1483  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1484  AVIndexEntry *e;
1485  int index;
1486 
1488  e = &st->index_entries[index];
1489 
1490  if (index >= 0 && e->timestamp == ast->frame_offset) {
1491  if (index == st->nb_index_entries-1) {
1492  int key=1;
1493  uint32_t state=-1;
1494  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1495  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1496  while (ptr < end) {
1497  ptr = avpriv_find_start_code(ptr, end, &state);
1498  if (state == 0x1B6 && ptr < end) {
1499  key = !(*ptr & 0xC0);
1500  break;
1501  }
1502  }
1503  }
1504  if (!key)
1505  e->flags &= ~AVINDEX_KEYFRAME;
1506  }
1507  if (e->flags & AVINDEX_KEYFRAME)
1508  pkt->flags |= AV_PKT_FLAG_KEY;
1509  }
1510  } else {
1511  pkt->flags |= AV_PKT_FLAG_KEY;
1512  }
1513  ast->frame_offset += get_duration(ast, pkt->size);
1514  }
1515  ast->remaining -= err;
1516  if (!ast->remaining) {
1517  avi->stream_index = -1;
1518  ast->packet_size = 0;
1519  }
1520 
1521  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1522  av_packet_unref(pkt);
1523  goto resync;
1524  }
1525  ast->seek_pos= 0;
1526 
1527  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1528  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1529 
1530  if (avi->dts_max < dts) {
1531  avi->dts_max = dts;
1532  } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1533  avi->non_interleaved= 1;
1534  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1535  }
1536  }
1537 
1538  return 0;
1539  }
1540 
1541  if ((err = avi_sync(s, 0)) < 0)
1542  return err;
1543  goto resync;
1544 }
1545 
1546 /* XXX: We make the implicit supposition that the positions are sorted
1547  * for each stream. */
1549 {
1550  AVIContext *avi = s->priv_data;
1551  AVIOContext *pb = s->pb;
1552  int nb_index_entries, i;
1553  AVStream *st;
1554  AVIStream *ast;
1555  int64_t pos;
1556  unsigned int index, tag, flags, len, first_packet = 1;
1557  int64_t last_pos = -1;
1558  unsigned last_idx = -1;
1559  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1560  int anykey = 0;
1561 
1562  nb_index_entries = size / 16;
1563  if (nb_index_entries <= 0)
1564  return AVERROR_INVALIDDATA;
1565 
1566  idx1_pos = avio_tell(pb);
1567  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1568  if (avi_sync(s, 1) == 0)
1569  first_packet_pos = avio_tell(pb) - 8;
1570  avi->stream_index = -1;
1571  avio_seek(pb, idx1_pos, SEEK_SET);
1572 
1573  if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1574  first_packet_pos = 0;
1575  data_offset = avi->movi_list;
1576  }
1577 
1578  /* Read the entries and sort them in each stream component. */
1579  for (i = 0; i < nb_index_entries; i++) {
1580  if (avio_feof(pb))
1581  return -1;
1582 
1583  tag = avio_rl32(pb);
1584  flags = avio_rl32(pb);
1585  pos = avio_rl32(pb);
1586  len = avio_rl32(pb);
1587  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1588  i, tag, flags, pos, len);
1589 
1590  index = ((tag & 0xff) - '0') * 10;
1591  index += (tag >> 8 & 0xff) - '0';
1592  if (index >= s->nb_streams)
1593  continue;
1594  st = s->streams[index];
1595  ast = st->priv_data;
1596 
1597  /* Skip 'xxpc' palette change entries in the index until a logic
1598  * to process these is properly implemented. */
1599  if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1600  continue;
1601 
1602  if (first_packet && first_packet_pos) {
1603  if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1604  data_offset = first_packet_pos - pos;
1605  first_packet = 0;
1606  }
1607  pos += data_offset;
1608 
1609  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1610 
1611  // even if we have only a single stream, we should
1612  // switch to non-interleaved to get correct timestamps
1613  if (last_pos == pos)
1614  avi->non_interleaved = 1;
1615  if (last_idx != pos && len) {
1616  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1617  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1618  last_idx= pos;
1619  }
1620  ast->cum_len += get_duration(ast, len);
1621  last_pos = pos;
1622  anykey |= flags&AVIIF_INDEX;
1623  }
1624  if (!anykey) {
1625  for (index = 0; index < s->nb_streams; index++) {
1626  st = s->streams[index];
1627  if (st->nb_index_entries)
1629  }
1630  }
1631  return 0;
1632 }
1633 
1634 /* Scan the index and consider any file with streams more than
1635  * 2 seconds or 64MB apart non-interleaved. */
1637 {
1638  int64_t min_pos, pos;
1639  int i;
1640  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1641  if (!idx)
1642  return AVERROR(ENOMEM);
1643  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1644  int64_t max_dts = INT64_MIN / 2;
1645  int64_t min_dts = INT64_MAX / 2;
1646  int64_t max_buffer = 0;
1647 
1648  min_pos = INT64_MAX;
1649 
1650  for (i = 0; i < s->nb_streams; i++) {
1651  AVStream *st = s->streams[i];
1652  AVIStream *ast = st->priv_data;
1653  int n = st->nb_index_entries;
1654  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1655  idx[i]++;
1656  if (idx[i] < n) {
1657  int64_t dts;
1658  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1659  FFMAX(ast->sample_size, 1),
1660  st->time_base, AV_TIME_BASE_Q);
1661  min_dts = FFMIN(min_dts, dts);
1662  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1663  }
1664  }
1665  for (i = 0; i < s->nb_streams; i++) {
1666  AVStream *st = s->streams[i];
1667  AVIStream *ast = st->priv_data;
1668 
1669  if (idx[i] && min_dts != INT64_MAX / 2) {
1670  int64_t dts;
1671  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1672  FFMAX(ast->sample_size, 1),
1673  st->time_base, AV_TIME_BASE_Q);
1674  max_dts = FFMAX(max_dts, dts);
1675  max_buffer = FFMAX(max_buffer,
1676  av_rescale(dts - min_dts,
1677  st->codecpar->bit_rate,
1678  AV_TIME_BASE));
1679  }
1680  }
1681  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1682  max_buffer > 1024 * 1024 * 8 * 8) {
1683  av_free(idx);
1684  return 1;
1685  }
1686  }
1687  av_free(idx);
1688  return 0;
1689 }
1690 
1692 {
1693  int i;
1694  int64_t last_start = 0;
1695  int64_t first_end = INT64_MAX;
1696  int64_t oldpos = avio_tell(s->pb);
1697 
1698  for (i = 0; i < s->nb_streams; i++) {
1699  AVStream *st = s->streams[i];
1700  int n = st->nb_index_entries;
1701  unsigned int size;
1702 
1703  if (n <= 0)
1704  continue;
1705 
1706  if (n >= 2) {
1707  int64_t pos = st->index_entries[0].pos;
1708  unsigned tag[2];
1709  avio_seek(s->pb, pos, SEEK_SET);
1710  tag[0] = avio_r8(s->pb);
1711  tag[1] = avio_r8(s->pb);
1712  avio_rl16(s->pb);
1713  size = avio_rl32(s->pb);
1714  if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1715  last_start = INT64_MAX;
1716  if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1717  last_start = INT64_MAX;
1718  }
1719 
1720  if (st->index_entries[0].pos > last_start)
1721  last_start = st->index_entries[0].pos;
1722  if (st->index_entries[n - 1].pos < first_end)
1723  first_end = st->index_entries[n - 1].pos;
1724  }
1725  avio_seek(s->pb, oldpos, SEEK_SET);
1726 
1727  if (last_start > first_end)
1728  return 1;
1729 
1730  return check_stream_max_drift(s);
1731 }
1732 
1734 {
1735  AVIContext *avi = s->priv_data;
1736  AVIOContext *pb = s->pb;
1737  uint32_t tag, size;
1738  int64_t pos = avio_tell(pb);
1739  int64_t next;
1740  int ret = -1;
1741 
1742  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1743  goto the_end; // maybe truncated file
1744  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1745  for (;;) {
1746  tag = avio_rl32(pb);
1747  size = avio_rl32(pb);
1748  if (avio_feof(pb))
1749  break;
1750  next = avio_tell(pb) + size + (size & 1);
1751 
1752  if (tag == MKTAG('i', 'd', 'x', '1') &&
1753  avi_read_idx1(s, size) >= 0) {
1754  avi->index_loaded=2;
1755  ret = 0;
1756  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1757  uint32_t tag1 = avio_rl32(pb);
1758 
1759  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1760  ff_read_riff_info(s, size - 4);
1761  }else if (!ret)
1762  break;
1763 
1764  if (avio_seek(pb, next, SEEK_SET) < 0)
1765  break; // something is wrong here
1766  }
1767 
1768 the_end:
1769  avio_seek(pb, pos, SEEK_SET);
1770  return ret;
1771 }
1772 
1773 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1774 {
1775  AVIStream *ast2 = st2->priv_data;
1776  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1777  av_packet_unref(&ast2->sub_pkt);
1778  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1779  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1780  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1781 }
1782 
1783 static int avi_read_seek(AVFormatContext *s, int stream_index,
1784  int64_t timestamp, int flags)
1785 {
1786  AVIContext *avi = s->priv_data;
1787  AVStream *st;
1788  int i, index;
1789  int64_t pos, pos_min;
1790  AVIStream *ast;
1791 
1792  /* Does not matter which stream is requested dv in avi has the
1793  * stream information in the first video stream.
1794  */
1795  if (avi->dv_demux)
1796  stream_index = 0;
1797 
1798  if (!avi->index_loaded) {
1799  /* we only load the index on demand */
1800  avi_load_index(s);
1801  avi->index_loaded |= 1;
1802  }
1803  av_assert0(stream_index >= 0);
1804 
1805  st = s->streams[stream_index];
1806  ast = st->priv_data;
1807  index = av_index_search_timestamp(st,
1808  timestamp * FFMAX(ast->sample_size, 1),
1809  flags);
1810  if (index < 0) {
1811  if (st->nb_index_entries > 0)
1812  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1813  timestamp * FFMAX(ast->sample_size, 1),
1814  st->index_entries[0].timestamp,
1816  return AVERROR_INVALIDDATA;
1817  }
1818 
1819  /* find the position */
1820  pos = st->index_entries[index].pos;
1821  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1822 
1823  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1824  timestamp, index, st->index_entries[index].timestamp);
1825 
1826  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1827  /* One and only one real stream for DV in AVI, and it has video */
1828  /* offsets. Calling with other stream indexes should have failed */
1829  /* the av_index_search_timestamp call above. */
1830 
1831  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1832  return -1;
1833 
1834  /* Feed the DV video stream version of the timestamp to the */
1835  /* DV demux so it can synthesize correct timestamps. */
1836  ff_dv_offset_reset(avi->dv_demux, timestamp);
1837 
1838  avi->stream_index = -1;
1839  return 0;
1840  }
1841 
1842  pos_min = pos;
1843  for (i = 0; i < s->nb_streams; i++) {
1844  AVStream *st2 = s->streams[i];
1845  AVIStream *ast2 = st2->priv_data;
1846 
1847  ast2->packet_size =
1848  ast2->remaining = 0;
1849 
1850  if (ast2->sub_ctx) {
1851  seek_subtitle(st, st2, timestamp);
1852  continue;
1853  }
1854 
1855  if (st2->nb_index_entries <= 0)
1856  continue;
1857 
1858 // av_assert1(st2->codecpar->block_align);
1859  index = av_index_search_timestamp(st2,
1860  av_rescale_q(timestamp,
1861  st->time_base,
1862  st2->time_base) *
1863  FFMAX(ast2->sample_size, 1),
1864  flags |
1867  if (index < 0)
1868  index = 0;
1869  ast2->seek_pos = st2->index_entries[index].pos;
1870  pos_min = FFMIN(pos_min,ast2->seek_pos);
1871  }
1872  for (i = 0; i < s->nb_streams; i++) {
1873  AVStream *st2 = s->streams[i];
1874  AVIStream *ast2 = st2->priv_data;
1875 
1876  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1877  continue;
1878 
1879  index = av_index_search_timestamp(
1880  st2,
1881  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1883  if (index < 0)
1884  index = 0;
1885  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1886  index--;
1887  ast2->frame_offset = st2->index_entries[index].timestamp;
1888  }
1889 
1890  /* do the seek */
1891  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1892  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1893  return -1;
1894  }
1895  avi->stream_index = -1;
1896  avi->dts_max = INT_MIN;
1897  return 0;
1898 }
1899 
1901 {
1902  int i;
1903  AVIContext *avi = s->priv_data;
1904 
1905  for (i = 0; i < s->nb_streams; i++) {
1906  AVStream *st = s->streams[i];
1907  AVIStream *ast = st->priv_data;
1908  if (ast) {
1909  if (ast->sub_ctx) {
1910  av_freep(&ast->sub_ctx->pb);
1912  }
1913  av_buffer_unref(&ast->sub_buffer);
1914  av_packet_unref(&ast->sub_pkt);
1915  }
1916  }
1917 
1918  av_freep(&avi->dv_demux);
1919 
1920  return 0;
1921 }
1922 
1923 static int avi_probe(const AVProbeData *p)
1924 {
1925  int i;
1926 
1927  /* check file header */
1928  for (i = 0; avi_headers[i][0]; i++)
1929  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1930  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1931  return AVPROBE_SCORE_MAX;
1932 
1933  return 0;
1934 }
1935 
1937  .name = "avi",
1938  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1939  .priv_data_size = sizeof(AVIContext),
1940  .extensions = "avi",
1941  .read_probe = avi_probe,
1946  .priv_class = &demuxer_class,
1947 };
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:228
static AVStream * get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt)
Definition: avidec.c:1131
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2512
#define ff_tlog(ctx,...)
Definition: internal.h:86
#define NULL
Definition: coverity.c:32
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:797
uint32_t handler
Definition: avidec.c:47
Bytestream IO Context.
Definition: avio.h:161
#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:334
uint32_t pal[256]
Definition: avidec.c:56
static struct @314 state
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
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
int size
if(ret< 0)
Definition: vf_mcdeint.c:279
AVOption.
Definition: opt.h:246
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:2045
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3158
AVFormatContext * sub_ctx
Definition: avidec.c:61
#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:228
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
#define MAX_ODML_DEPTH
Definition: avidec.c:83
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:375
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:4938
#define print_tag(s, str, tag, size)
Definition: avidec.c:119
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:159
const char * desc
Definition: nvenc.c:79
int64_t pos
Definition: avformat.h:805
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2514
int64_t last_pkt_pos
Definition: avidec.c:75
uint32_t rate
Definition: avidec.c:49
#define avpriv_request_sample(...)
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: codec_par.h:60
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:938
int dshow_block_align
Definition: avidec.c:58
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:877
int size
Definition: packet.h:356
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:455
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1105
int is_odml
Definition: avidec.c:77
enum AVMediaType codec_type
Definition: rtp.c:37
int64_t movi_end
Definition: avidec.c:71
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:48
#define AV_RL16
Definition: intreadwrite.h:42
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:533
static int get_duration(AVIStream *ast, int len)
Definition: avidec.c:123
void * priv_data
Definition: avformat.h:891
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
#define AVIIF_INDEX
Definition: avi.h:38
const char * key
discard all
Definition: avcodec.h:236
static AVPacket pkt
static void error(const char *err)
static int ni_prepare_read(AVFormatContext *s)
Definition: avidec.c:1332
EXIF metadata parser.
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:1636
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:111
uint8_t base
Definition: vp3data.h:202
Format I/O context.
Definition: avformat.h:1351
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:1484
Public dictionary API.
int stream_index
Definition: avidec.c:79
static char buffer[20]
Definition: seek.c:32
uint8_t
static int nb_streams
Definition: ffprobe.c:282
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:203
int width
Video only.
Definition: codec_par.h:126
AVOptions.
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1900
int64_t riff_end
Definition: avidec.c:70
const AVCodecTag ff_codec_movvideo_tags[]
Definition: isom.c:75
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:778
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
int use_odml
Definition: avidec.c:82
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
enum AVStreamParseType need_parsing
Definition: avformat.h:1094
int id
Format-specific stream ID.
Definition: avformat.h:883
int64_t movi_list
Definition: avidec.c:74
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4519
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
int64_t duration
Definition: movenc.c:63
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:144
static void clean_index(AVFormatContext *s)
Definition: avidec.c:266
const char data[16]
Definition: mxf.c:91
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:1482
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:324
uint8_t * data
Definition: packet.h:355
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
Definition: avidec.c:1061
uint32_t tag
Definition: movenc.c:1532
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:304
const AVCodecTag ff_codec_bmp_tags_unofficial[]
Definition: riff.c:500
#define max(a, b)
Definition: cuda_runtime.h:33
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
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:625
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:91
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:388
int packet_size
Definition: avidec.c:45
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 ff_const59
The ff_const59 define is not part of the public API and will be removed without further warning...
Definition: avformat.h:544
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AVINDEX_KEYFRAME
Definition: avformat.h:812
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
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
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#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:1591
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: packet.h:46
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2162
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:747
#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:44
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:806
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
unsigned int pos
Definition: spdifenc.c:410
#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: codec_id.h:411
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:338
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
Definition: avidec.c:294
simple assert() macros that are a bit more flexible than ISO C assert().
static int get_stream_idx(const unsigned *d)
Definition: avidec.c:1165
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:239
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:949
#define FFMAX(a, b)
Definition: common.h:94
#define fail()
Definition: checkasm.h:123
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
Only parse headers, do not repack.
Definition: avformat.h:796
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
int prefix_count
Definition: avidec.c:55
AVBufferRef * sub_buffer
Definition: avidec.c:63
int non_interleaved
Definition: avidec.c:78
int block_align
Audio only.
Definition: codec_par.h:177
const char * name
Definition: qsvenc.c:46
static int avi_probe(const AVProbeData *p)
Definition: avidec.c:1923
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
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:254
#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
void ff_free_stream(AVFormatContext *s, AVStream *st)
Definition: utils.c:4440
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&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
int64_t cum_len
Definition: avidec.c:53
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:467
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static const char months[12][4]
Definition: avidec.c:320
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define s(width, name)
Definition: cbs_vp9.c:257
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
Definition: avidec.c:1773
static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
Definition: avidec.c:385
#define AVFMT_FLAG_SORT_DTS
try to interleave outputted packets by dts (using this flag can slow demuxing down) ...
Definition: avformat.h:1503
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1666
AVDictionary * metadata
Definition: avformat.h:940
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:51
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:825
static int calculate_bitrate(AVFormatContext *s)
Definition: avidec.c:423
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:876
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:102
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:54
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
#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:163
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:260
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
static int resync(AVFormatContext *s)
Definition: flvdec.c:948
int index_loaded
Definition: avidec.c:76
int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size, int le, int depth, AVDictionary **metadata)
Recursively decodes all IFD&#39;s and adds included TAGS into the metadata dictionary.
Definition: exif.c:144
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:605
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:1107
double value
Definition: eval.c:98
static const AVOption options[]
Definition: avidec.c:88
Describe the class of an AVClass context structure.
Definition: log.h:67
static int avi_read_idx1(AVFormatContext *s, int size)
Definition: avidec.c:1548
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
discard useless packets like 0 size packets in avi
Definition: avcodec.h:231
#define snprintf
Definition: snprintf.h:34
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
int error
contains the error code or 0 if no error happened
Definition: avio.h:245
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
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:2543
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:591
int64_t seek_pos
Definition: avidec.c:65
#define flags(name, subs,...)
Definition: cbs_av1.c:564
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1733
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
#define AVERROR_DEMUXER_NOT_FOUND
Demuxer not found.
Definition: error.h:53
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1936
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:925
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:453
int64_t io_fsize
Definition: avidec.c:73
int64_t bitrate
Definition: h264_levels.c:131
A reference to a data buffer.
Definition: buffer.h:81
static const AVClass demuxer_class
Definition: avidec.c:93
full parsing and repack
Definition: avformat.h:795
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:731
Main libavformat public API header.
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
Definition: avidec.c:342
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
Definition: avidec.c:323
common internal api header.
AVPacket sub_pkt
Definition: avidec.c:62
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:915
#define CONFIG_DV_DEMUXER
Definition: config.h:2155
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1618
static int get_riff(AVFormatContext *s, AVIOContext *pb)
Definition: avidec.c:133
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:143
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:3339
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
int den
Denominator.
Definition: rational.h:60
int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
Definition: dv.c:347
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 sample_size
Definition: avidec.c:50
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4491
#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
#define av_free(p)
char * value
Definition: dict.h:87
int len
int has_pal
Definition: avidec.c:57
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1691
void * priv_data
Format private data.
Definition: avformat.h:1379
int64_t frame_offset
Definition: avidec.c:42
int64_t dts_max
Definition: avidec.c:84
int64_t fsize
Definition: avidec.c:72
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:354
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1783
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1466
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
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:332
int stream_index
Definition: packet.h:357
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:905
static int read_odml_index(AVFormatContext *s, int frame_num)
Definition: avidec.c:158
#define MKTAG(a, b, c, d)
Definition: common.h:406
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2064
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:931
int odml_depth
Definition: avidec.c:81
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1133
This structure stores compressed data.
Definition: packet.h:332
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:755
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:1179
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
void * av_mallocz_array(size_t nmemb, size_t size)
Allocate a memory block for an array with av_mallocz().
Definition: mem.c:192
DVDemuxContext * dv_demux
Definition: avidec.c:80