FFmpeg  4.2.3
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/bswap.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/mathematics.h"
32 #include "avformat.h"
33 #include "avi.h"
34 #include "dv.h"
35 #include "internal.h"
36 #include "isom.h"
37 #include "riff.h"
38 #include "libavcodec/bytestream.h"
39 #include "libavcodec/exif.h"
40 #include "libavcodec/internal.h"
41 
42 typedef struct AVIStream {
43  int64_t frame_offset; /* current frame (video) or byte (audio) counter
44  * (used to compute the pts) */
45  int remaining;
47 
48  uint32_t handler;
49  uint32_t scale;
50  uint32_t rate;
51  int sample_size; /* size of one sample (or packet)
52  * (in the rate/scale sense) in bytes */
53 
54  int64_t cum_len; /* temporary storage (used during seek) */
55  int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
57  uint32_t pal[256];
58  int has_pal;
59  int dshow_block_align; /* block align variable used to emulate bugs in
60  * the MS dshow demuxer */
61 
65 
66  int64_t seek_pos;
67 } AVIStream;
68 
69 typedef struct AVIContext {
70  const AVClass *class;
71  int64_t riff_end;
72  int64_t movi_end;
73  int64_t fsize;
74  int64_t io_fsize;
75  int64_t movi_list;
76  int64_t last_pkt_pos;
78  int is_odml;
83  int use_odml;
84 #define MAX_ODML_DEPTH 1000
85  int64_t dts_max;
86 } AVIContext;
87 
88 
89 static const AVOption options[] = {
90  { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
91  { NULL },
92 };
93 
94 static const AVClass demuxer_class = {
95  .class_name = "avi",
96  .item_name = av_default_item_name,
97  .option = options,
98  .version = LIBAVUTIL_VERSION_INT,
99  .category = AV_CLASS_CATEGORY_DEMUXER,
100 };
101 
102 
103 static const char avi_headers[][8] = {
104  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
105  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
106  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
107  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
108  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
109  { 0 }
110 };
111 
113  { "strn", "title" },
114  { 0 },
115 };
116 
117 static int avi_load_index(AVFormatContext *s);
118 static int guess_ni_flag(AVFormatContext *s);
119 
120 #define print_tag(str, tag, size) \
121  av_log(NULL, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
122  avio_tell(pb), str, av_fourcc2str(tag), size) \
123 
124 static inline int get_duration(AVIStream *ast, int len)
125 {
126  if (ast->sample_size)
127  return len;
128  else if (ast->dshow_block_align)
129  return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
130  else
131  return 1;
132 }
133 
135 {
136  AVIContext *avi = s->priv_data;
137  char header[8] = {0};
138  int i;
139 
140  /* check RIFF header */
141  avio_read(pb, header, 4);
142  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
143  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
144  avio_read(pb, header + 4, 4);
145 
146  for (i = 0; avi_headers[i][0]; i++)
147  if (!memcmp(header, avi_headers[i], 8))
148  break;
149  if (!avi_headers[i][0])
150  return AVERROR_INVALIDDATA;
151 
152  if (header[7] == 0x19)
153  av_log(s, AV_LOG_INFO,
154  "This file has been generated by a totally broken muxer.\n");
155 
156  return 0;
157 }
158 
159 static int read_odml_index(AVFormatContext *s, int frame_num)
160 {
161  AVIContext *avi = s->priv_data;
162  AVIOContext *pb = s->pb;
163  int longs_per_entry = avio_rl16(pb);
164  int index_sub_type = avio_r8(pb);
165  int index_type = avio_r8(pb);
166  int entries_in_use = avio_rl32(pb);
167  int chunk_id = avio_rl32(pb);
168  int64_t base = avio_rl64(pb);
169  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
170  ((chunk_id >> 8 & 0xFF) - '0');
171  AVStream *st;
172  AVIStream *ast;
173  int i;
174  int64_t last_pos = -1;
175  int64_t filesize = avi->fsize;
176 
177  av_log(s, AV_LOG_TRACE,
178  "longs_per_entry:%d index_type:%d entries_in_use:%d "
179  "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
180  longs_per_entry,
181  index_type,
182  entries_in_use,
183  chunk_id,
184  base,
185  frame_num);
186 
187  if (stream_id >= s->nb_streams || stream_id < 0)
188  return AVERROR_INVALIDDATA;
189  st = s->streams[stream_id];
190  ast = st->priv_data;
191 
192  if (index_sub_type)
193  return AVERROR_INVALIDDATA;
194 
195  avio_rl32(pb);
196 
197  if (index_type && longs_per_entry != 2)
198  return AVERROR_INVALIDDATA;
199  if (index_type > 1)
200  return AVERROR_INVALIDDATA;
201 
202  if (filesize > 0 && base >= filesize) {
203  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
204  if (base >> 32 == (base & 0xFFFFFFFF) &&
205  (base & 0xFFFFFFFF) < filesize &&
206  filesize <= 0xFFFFFFFF)
207  base &= 0xFFFFFFFF;
208  else
209  return AVERROR_INVALIDDATA;
210  }
211 
212  for (i = 0; i < entries_in_use; i++) {
213  if (index_type) {
214  int64_t pos = avio_rl32(pb) + base - 8;
215  int len = avio_rl32(pb);
216  int key = len >= 0;
217  len &= 0x7FFFFFFF;
218 
219  av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
220 
221  if (avio_feof(pb))
222  return AVERROR_INVALIDDATA;
223 
224  if (last_pos == pos || pos == base - 8)
225  avi->non_interleaved = 1;
226  if (last_pos != pos && len)
227  av_add_index_entry(st, pos, ast->cum_len, len, 0,
228  key ? AVINDEX_KEYFRAME : 0);
229 
230  ast->cum_len += get_duration(ast, len);
231  last_pos = pos;
232  } else {
233  int64_t offset, pos;
234  int duration;
235  offset = avio_rl64(pb);
236  avio_rl32(pb); /* size */
237  duration = avio_rl32(pb);
238 
239  if (avio_feof(pb))
240  return AVERROR_INVALIDDATA;
241 
242  pos = avio_tell(pb);
243 
244  if (avi->odml_depth > MAX_ODML_DEPTH) {
245  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
246  return AVERROR_INVALIDDATA;
247  }
248 
249  if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
250  return -1;
251  avi->odml_depth++;
252  read_odml_index(s, frame_num);
253  avi->odml_depth--;
254  frame_num += duration;
255 
256  if (avio_seek(pb, pos, SEEK_SET) < 0) {
257  av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
258  return -1;
259  }
260 
261  }
262  }
263  avi->index_loaded = 2;
264  return 0;
265 }
266 
268 {
269  int i;
270  int64_t j;
271 
272  for (i = 0; i < s->nb_streams; i++) {
273  AVStream *st = s->streams[i];
274  AVIStream *ast = st->priv_data;
275  int n = st->nb_index_entries;
276  int max = ast->sample_size;
277  int64_t pos, size, ts;
278 
279  if (n != 1 || ast->sample_size == 0)
280  continue;
281 
282  while (max < 1024)
283  max += max;
284 
285  pos = st->index_entries[0].pos;
286  size = st->index_entries[0].size;
287  ts = st->index_entries[0].timestamp;
288 
289  for (j = 0; j < size; j += max)
290  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
292  }
293 }
294 
295 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
296  uint32_t size)
297 {
298  AVIOContext *pb = s->pb;
299  char key[5] = { 0 };
300  char *value;
301 
302  size += (size & 1);
303 
304  if (size == UINT_MAX)
305  return AVERROR(EINVAL);
306  value = av_malloc(size + 1);
307  if (!value)
308  return AVERROR(ENOMEM);
309  if (avio_read(pb, value, size) != size)
310  return AVERROR_INVALIDDATA;
311  value[size] = 0;
312 
313  AV_WL32(key, tag);
314 
315  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
317 }
318 
319 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
320  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
321 
322 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
323 {
324  char month[4], time[9], buffer[64];
325  int i, day, year;
326  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
327  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
328  month, &day, time, &year) == 4) {
329  for (i = 0; i < 12; i++)
330  if (!av_strcasecmp(month, months[i])) {
331  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
332  year, i + 1, day, time);
333  av_dict_set(metadata, "creation_time", buffer, 0);
334  }
335  } else if (date[4] == '/' && date[7] == '/') {
336  date[4] = date[7] = '-';
337  av_dict_set(metadata, "creation_time", date, 0);
338  }
339 }
340 
341 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
342 {
343  while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
344  uint32_t tag = avio_rl32(s->pb);
345  uint32_t size = avio_rl32(s->pb);
346  switch (tag) {
347  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
348  {
349  uint64_t tag_end = avio_tell(s->pb) + size;
350  while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
351  uint16_t tag = avio_rl16(s->pb);
352  uint16_t size = avio_rl16(s->pb);
353  const char *name = NULL;
354  char buffer[64] = { 0 };
355  size = FFMIN(size, tag_end - avio_tell(s->pb));
356  size -= avio_read(s->pb, buffer,
357  FFMIN(size, sizeof(buffer) - 1));
358  switch (tag) {
359  case 0x03:
360  name = "maker";
361  break;
362  case 0x04:
363  name = "model";
364  break;
365  case 0x13:
366  name = "creation_time";
367  if (buffer[4] == ':' && buffer[7] == ':')
368  buffer[4] = buffer[7] = '-';
369  break;
370  }
371  if (name)
372  av_dict_set(&s->metadata, name, buffer, 0);
373  avio_skip(s->pb, size);
374  }
375  break;
376  }
377  default:
378  avio_skip(s->pb, size);
379  break;
380  }
381  }
382 }
383 
385 {
386  GetByteContext gb;
387  uint8_t *data = st->codecpar->extradata;
388  int data_size = st->codecpar->extradata_size;
389  int tag, offset;
390 
391  if (!data || data_size < 8) {
392  return AVERROR_INVALIDDATA;
393  }
394 
395  bytestream2_init(&gb, data, data_size);
396 
397  tag = bytestream2_get_le32(&gb);
398 
399  switch (tag) {
400  case MKTAG('A', 'V', 'I', 'F'):
401  // skip 4 byte padding
402  bytestream2_skip(&gb, 4);
403  offset = bytestream2_tell(&gb);
404 
405  // decode EXIF tags from IFD, AVI is always little-endian
406  return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
407  1, 0, &st->metadata);
408  break;
409  case MKTAG('C', 'A', 'S', 'I'):
410  avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
411  break;
412  case MKTAG('Z', 'o', 'r', 'a'):
413  avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
414  break;
415  default:
416  break;
417  }
418 
419  return 0;
420 }
421 
423 {
424  AVIContext *avi = s->priv_data;
425  int i, j;
426  int64_t lensum = 0;
427  int64_t maxpos = 0;
428 
429  for (i = 0; i<s->nb_streams; i++) {
430  int64_t len = 0;
431  AVStream *st = s->streams[i];
432 
433  if (!st->nb_index_entries)
434  continue;
435 
436  for (j = 0; j < st->nb_index_entries; j++)
437  len += st->index_entries[j].size;
438  maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
439  lensum += len;
440  }
441  if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
442  return 0;
443  if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
444  return 0;
445 
446  for (i = 0; i<s->nb_streams; i++) {
447  int64_t len = 0;
448  AVStream *st = s->streams[i];
449  int64_t duration;
450  int64_t bitrate;
451 
452  for (j = 0; j < st->nb_index_entries; j++)
453  len += st->index_entries[j].size;
454 
455  if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
456  continue;
457  duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
458  bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
459  if (bitrate > 0) {
460  st->codecpar->bit_rate = bitrate;
461  }
462  }
463  return 1;
464 }
465 
467 {
468  AVIContext *avi = s->priv_data;
469  AVIOContext *pb = s->pb;
470  unsigned int tag, tag1, handler;
471  int codec_type, stream_index, frame_period;
472  unsigned int size;
473  int i;
474  AVStream *st;
475  AVIStream *ast = NULL;
476  int avih_width = 0, avih_height = 0;
477  int amv_file_format = 0;
478  uint64_t list_end = 0;
479  int64_t pos;
480  int ret;
481  AVDictionaryEntry *dict_entry;
482 
483  avi->stream_index = -1;
484 
485  ret = get_riff(s, pb);
486  if (ret < 0)
487  return ret;
488 
489  av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
490 
491  avi->io_fsize = avi->fsize = avio_size(pb);
492  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
493  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
494 
495  /* first list tag */
496  stream_index = -1;
497  codec_type = -1;
498  frame_period = 0;
499  for (;;) {
500  if (avio_feof(pb))
501  goto fail;
502  tag = avio_rl32(pb);
503  size = avio_rl32(pb);
504 
505  print_tag("tag", tag, size);
506 
507  switch (tag) {
508  case MKTAG('L', 'I', 'S', 'T'):
509  list_end = avio_tell(pb) + size;
510  /* Ignored, except at start of video packets. */
511  tag1 = avio_rl32(pb);
512 
513  print_tag("list", tag1, 0);
514 
515  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
516  avi->movi_list = avio_tell(pb) - 4;
517  if (size)
518  avi->movi_end = avi->movi_list + size + (size & 1);
519  else
520  avi->movi_end = avi->fsize;
521  av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
522  goto end_of_header;
523  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
524  ff_read_riff_info(s, size - 4);
525  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
526  avi_read_nikon(s, list_end);
527 
528  break;
529  case MKTAG('I', 'D', 'I', 'T'):
530  {
531  unsigned char date[64] = { 0 };
532  size += (size & 1);
533  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
534  avio_skip(pb, size);
536  break;
537  }
538  case MKTAG('d', 'm', 'l', 'h'):
539  avi->is_odml = 1;
540  avio_skip(pb, size + (size & 1));
541  break;
542  case MKTAG('a', 'm', 'v', 'h'):
543  amv_file_format = 1;
544  case MKTAG('a', 'v', 'i', 'h'):
545  /* AVI header */
546  /* using frame_period is bad idea */
547  frame_period = avio_rl32(pb);
548  avio_rl32(pb); /* max. bytes per second */
549  avio_rl32(pb);
551 
552  avio_skip(pb, 2 * 4);
553  avio_rl32(pb);
554  avio_rl32(pb);
555  avih_width = avio_rl32(pb);
556  avih_height = avio_rl32(pb);
557 
558  avio_skip(pb, size - 10 * 4);
559  break;
560  case MKTAG('s', 't', 'r', 'h'):
561  /* stream header */
562 
563  tag1 = avio_rl32(pb);
564  handler = avio_rl32(pb); /* codec tag */
565 
566  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
567  avio_skip(pb, size - 8);
568  break;
569  } else {
570  stream_index++;
571  st = avformat_new_stream(s, NULL);
572  if (!st)
573  goto fail;
574 
575  st->id = stream_index;
576  ast = av_mallocz(sizeof(AVIStream));
577  if (!ast)
578  goto fail;
579  st->priv_data = ast;
580  }
581  if (amv_file_format)
582  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
583  : MKTAG('v', 'i', 'd', 's');
584 
585  print_tag("strh", tag1, -1);
586 
587  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
588  tag1 == MKTAG('i', 'v', 'a', 's')) {
589  int64_t dv_dur;
590 
591  /* After some consideration -- I don't think we
592  * have to support anything but DV in type1 AVIs. */
593  if (s->nb_streams != 1)
594  goto fail;
595 
596  if (handler != MKTAG('d', 'v', 's', 'd') &&
597  handler != MKTAG('d', 'v', 'h', 'd') &&
598  handler != MKTAG('d', 'v', 's', 'l'))
599  goto fail;
600 
601  ast = s->streams[0]->priv_data;
603  av_freep(&s->streams[0]->codecpar);
604 #if FF_API_LAVF_AVCTX
606  av_freep(&s->streams[0]->codec);
608 #endif
609  if (s->streams[0]->info)
611  av_freep(&s->streams[0]->info);
612  if (s->streams[0]->internal)
613  av_freep(&s->streams[0]->internal->avctx);
614  av_freep(&s->streams[0]->internal);
615  av_freep(&s->streams[0]);
616  s->nb_streams = 0;
617  if (CONFIG_DV_DEMUXER) {
618  avi->dv_demux = avpriv_dv_init_demux(s);
619  if (!avi->dv_demux)
620  goto fail;
621  } else
622  goto fail;
623  s->streams[0]->priv_data = ast;
624  avio_skip(pb, 3 * 4);
625  ast->scale = avio_rl32(pb);
626  ast->rate = avio_rl32(pb);
627  avio_skip(pb, 4); /* start time */
628 
629  dv_dur = avio_rl32(pb);
630  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
631  dv_dur *= AV_TIME_BASE;
632  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
633  }
634  /* else, leave duration alone; timing estimation in utils.c
635  * will make a guess based on bitrate. */
636 
637  stream_index = s->nb_streams - 1;
638  avio_skip(pb, size - 9 * 4);
639  break;
640  }
641 
642  av_assert0(stream_index < s->nb_streams);
643  ast->handler = handler;
644 
645  avio_rl32(pb); /* flags */
646  avio_rl16(pb); /* priority */
647  avio_rl16(pb); /* language */
648  avio_rl32(pb); /* initial frame */
649  ast->scale = avio_rl32(pb);
650  ast->rate = avio_rl32(pb);
651  if (!(ast->scale && ast->rate)) {
653  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
654  "(This file has been generated by broken software.)\n",
655  ast->scale,
656  ast->rate);
657  if (frame_period) {
658  ast->rate = 1000000;
659  ast->scale = frame_period;
660  } else {
661  ast->rate = 25;
662  ast->scale = 1;
663  }
664  }
665  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
666 
667  ast->cum_len = avio_rl32(pb); /* start */
668  st->nb_frames = avio_rl32(pb);
669 
670  st->start_time = 0;
671  avio_rl32(pb); /* buffer size */
672  avio_rl32(pb); /* quality */
673  if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
674  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
675  ast->cum_len = 0;
676  }
677  ast->sample_size = avio_rl32(pb);
678  ast->cum_len *= FFMAX(1, ast->sample_size);
679  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
680  ast->rate, ast->scale, ast->sample_size);
681 
682  switch (tag1) {
683  case MKTAG('v', 'i', 'd', 's'):
684  codec_type = AVMEDIA_TYPE_VIDEO;
685 
686  ast->sample_size = 0;
687  st->avg_frame_rate = av_inv_q(st->time_base);
688  break;
689  case MKTAG('a', 'u', 'd', 's'):
690  codec_type = AVMEDIA_TYPE_AUDIO;
691  break;
692  case MKTAG('t', 'x', 't', 's'):
693  codec_type = AVMEDIA_TYPE_SUBTITLE;
694  break;
695  case MKTAG('d', 'a', 't', 's'):
696  codec_type = AVMEDIA_TYPE_DATA;
697  break;
698  default:
699  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
700  }
701 
702  if (ast->sample_size < 0) {
703  if (s->error_recognition & AV_EF_EXPLODE) {
704  av_log(s, AV_LOG_ERROR,
705  "Invalid sample_size %d at stream %d\n",
706  ast->sample_size,
707  stream_index);
708  goto fail;
709  }
711  "Invalid sample_size %d at stream %d "
712  "setting it to 0\n",
713  ast->sample_size,
714  stream_index);
715  ast->sample_size = 0;
716  }
717 
718  if (ast->sample_size == 0) {
719  st->duration = st->nb_frames;
720  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
721  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
722  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
723  }
724  }
725  ast->frame_offset = ast->cum_len;
726  avio_skip(pb, size - 12 * 4);
727  break;
728  case MKTAG('s', 't', 'r', 'f'):
729  /* stream header */
730  if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
731  codec_type == AVMEDIA_TYPE_VIDEO))
732  break;
733  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
734  avio_skip(pb, size);
735  } else {
736  uint64_t cur_pos = avio_tell(pb);
737  unsigned esize;
738  if (cur_pos < list_end)
739  size = FFMIN(size, list_end - cur_pos);
740  st = s->streams[stream_index];
742  avio_skip(pb, size);
743  break;
744  }
745  switch (codec_type) {
746  case AVMEDIA_TYPE_VIDEO:
747  if (amv_file_format) {
748  st->codecpar->width = avih_width;
749  st->codecpar->height = avih_height;
752  avio_skip(pb, size);
753  break;
754  }
755  tag1 = ff_get_bmp_header(pb, st, &esize);
756 
757  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
758  tag1 == MKTAG('D', 'X', 'S', 'A')) {
760  st->codecpar->codec_tag = tag1;
762  break;
763  }
764 
765  if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
766  if (esize == size-1 && (esize&1)) {
767  st->codecpar->extradata_size = esize - 10 * 4;
768  } else
769  st->codecpar->extradata_size = size - 10 * 4;
770  if (st->codecpar->extradata) {
771  av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
772  av_freep(&st->codecpar->extradata);
773  }
774  if (ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size) < 0)
775  return AVERROR(ENOMEM);
776  }
777 
778  // FIXME: check if the encoder really did this correctly
779  if (st->codecpar->extradata_size & 1)
780  avio_r8(pb);
781 
782  /* Extract palette from extradata if bpp <= 8.
783  * This code assumes that extradata contains only palette.
784  * This is true for all paletted codecs implemented in
785  * FFmpeg. */
786  if (st->codecpar->extradata_size &&
787  (st->codecpar->bits_per_coded_sample <= 8)) {
788  int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
789  const uint8_t *pal_src;
790 
791  pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
792  pal_src = st->codecpar->extradata +
793  st->codecpar->extradata_size - pal_size;
794  /* Exclude the "BottomUp" field from the palette */
795  if (pal_src - st->codecpar->extradata >= 9 &&
796  !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
797  pal_src -= 9;
798  for (i = 0; i < pal_size / 4; i++)
799  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
800  ast->has_pal = 1;
801  }
802 
803  print_tag("video", tag1, 0);
804 
806  st->codecpar->codec_tag = tag1;
808  tag1);
809  /* If codec is not found yet, try with the mov tags. */
810  if (!st->codecpar->codec_id) {
811  st->codecpar->codec_id =
813  if (st->codecpar->codec_id)
815  "mov tag found in avi (fourcc %s)\n",
816  av_fourcc2str(tag1));
817  }
818  if (!st->codecpar->codec_id)
820 
821  /* This is needed to get the pict type which is necessary
822  * for generating correct pts. */
824 
825  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
826  ast->handler == MKTAG('X', 'V', 'I', 'D'))
827  st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
828 
829  if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
831  if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
833 
834  if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
835  st->codecpar->extradata_size < 1U << 30) {
836  st->codecpar->extradata_size += 9;
837  if ((ret = av_reallocp(&st->codecpar->extradata,
838  st->codecpar->extradata_size +
840  st->codecpar->extradata_size = 0;
841  return ret;
842  } else
843  memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
844  "BottomUp", 9);
845  }
846  st->codecpar->height = FFABS(st->codecpar->height);
847 
848 // avio_skip(pb, size - 5 * 4);
849  break;
850  case AVMEDIA_TYPE_AUDIO:
851  ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
852  if (ret < 0)
853  return ret;
855  if (ast->sample_size && st->codecpar->block_align &&
856  ast->sample_size != st->codecpar->block_align) {
857  av_log(s,
859  "sample size (%d) != block align (%d)\n",
860  ast->sample_size,
861  st->codecpar->block_align);
862  ast->sample_size = st->codecpar->block_align;
863  }
864  /* 2-aligned
865  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
866  if (size & 1)
867  avio_skip(pb, 1);
868  /* Force parsing as several audio frames can be in
869  * one packet and timestamps refer to packet start. */
871  /* ADTS header is in extradata, AAC without header must be
872  * stored as exact frames. Parser not needed and it will
873  * fail. */
874  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
877  // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
878  if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
880  /* AVI files with Xan DPCM audio (wrongly) declare PCM
881  * audio in the header but have Axan as stream_code_tag. */
882  if (ast->handler == AV_RL32("Axan")) {
884  st->codecpar->codec_tag = 0;
885  ast->dshow_block_align = 0;
886  }
887  if (amv_file_format) {
889  ast->dshow_block_align = 0;
890  }
891  if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
893  st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
894  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
895  ast->dshow_block_align = 0;
896  }
897  if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
898  st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
899  st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
900  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
901  ast->sample_size = 0;
902  }
903  break;
906  st->request_probe= 1;
907  avio_skip(pb, size);
908  break;
909  default:
912  st->codecpar->codec_tag = 0;
913  avio_skip(pb, size);
914  break;
915  }
916  }
917  break;
918  case MKTAG('s', 't', 'r', 'd'):
919  if (stream_index >= (unsigned)s->nb_streams
920  || s->streams[stream_index]->codecpar->extradata_size
921  || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
922  avio_skip(pb, size);
923  } else {
924  uint64_t cur_pos = avio_tell(pb);
925  if (cur_pos < list_end)
926  size = FFMIN(size, list_end - cur_pos);
927  st = s->streams[stream_index];
928 
929  if (size<(1<<30)) {
930  if (st->codecpar->extradata) {
931  av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
932  av_freep(&st->codecpar->extradata);
933  }
934  if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
935  return AVERROR(ENOMEM);
936  }
937 
938  if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
939  avio_r8(pb);
940 
941  ret = avi_extract_stream_metadata(s, st);
942  if (ret < 0) {
943  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
944  }
945  }
946  break;
947  case MKTAG('i', 'n', 'd', 'x'):
948  pos = avio_tell(pb);
949  if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
950  avi->use_odml &&
951  read_odml_index(s, 0) < 0 &&
953  goto fail;
954  avio_seek(pb, pos + size, SEEK_SET);
955  break;
956  case MKTAG('v', 'p', 'r', 'p'):
957  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
958  AVRational active, active_aspect;
959 
960  st = s->streams[stream_index];
961  avio_rl32(pb);
962  avio_rl32(pb);
963  avio_rl32(pb);
964  avio_rl32(pb);
965  avio_rl32(pb);
966 
967  active_aspect.den = avio_rl16(pb);
968  active_aspect.num = avio_rl16(pb);
969  active.num = avio_rl32(pb);
970  active.den = avio_rl32(pb);
971  avio_rl32(pb); // nbFieldsPerFrame
972 
973  if (active_aspect.num && active_aspect.den &&
974  active.num && active.den) {
975  st->sample_aspect_ratio = av_div_q(active_aspect, active);
976  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
977  active_aspect.num, active_aspect.den,
978  active.num, active.den);
979  }
980  size -= 9 * 4;
981  }
982  avio_skip(pb, size);
983  break;
984  case MKTAG('s', 't', 'r', 'n'):
985  if (s->nb_streams) {
986  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
987  if (ret < 0)
988  return ret;
989  break;
990  }
991  default:
992  if (size > 1000000) {
993  av_log(s, AV_LOG_ERROR,
994  "Something went wrong during header parsing, "
995  "tag %s has size %u, "
996  "I will ignore it and try to continue anyway.\n",
997  av_fourcc2str(tag), size);
999  goto fail;
1000  avi->movi_list = avio_tell(pb) - 4;
1001  avi->movi_end = avi->fsize;
1002  goto end_of_header;
1003  }
1004  /* Do not fail for very large idx1 tags */
1005  case MKTAG('i', 'd', 'x', '1'):
1006  /* skip tag */
1007  size += (size & 1);
1008  avio_skip(pb, size);
1009  break;
1010  }
1011  }
1012 
1013 end_of_header:
1014  /* check stream number */
1015  if (stream_index != s->nb_streams - 1) {
1016 
1017 fail:
1018  return AVERROR_INVALIDDATA;
1019  }
1020 
1021  if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1022  avi_load_index(s);
1023  calculate_bitrate(s);
1024  avi->index_loaded |= 1;
1025 
1026  if ((ret = guess_ni_flag(s)) < 0)
1027  return ret;
1028 
1029  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1030 
1031  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1032  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1033  for (i = 0; i < s->nb_streams; i++) {
1034  AVStream *st = s->streams[i];
1038  }
1039 
1040  for (i = 0; i < s->nb_streams; i++) {
1041  AVStream *st = s->streams[i];
1042  if (st->nb_index_entries)
1043  break;
1044  }
1045  // DV-in-AVI cannot be non-interleaved, if set this must be
1046  // a mis-detection.
1047  if (avi->dv_demux)
1048  avi->non_interleaved = 0;
1049  if (i == s->nb_streams && avi->non_interleaved) {
1051  "Non-interleaved AVI without index, switching to interleaved\n");
1052  avi->non_interleaved = 0;
1053  }
1054 
1055  if (avi->non_interleaved) {
1056  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1057  clean_index(s);
1058  }
1059 
1060  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1062 
1063  return 0;
1064 }
1065 
1067 {
1068  if (pkt->size >= 7 &&
1069  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1070  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1071  uint8_t desc[256];
1072  int score = AVPROBE_SCORE_EXTENSION, ret;
1073  AVIStream *ast = st->priv_data;
1074  ff_const59 AVInputFormat *sub_demuxer;
1075  AVRational time_base;
1076  int size;
1077  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1078  pkt->size - 7,
1079  0, NULL, NULL, NULL, NULL);
1080  AVProbeData pd;
1081  unsigned int desc_len = avio_rl32(pb);
1082 
1083  if (desc_len > pb->buf_end - pb->buf_ptr)
1084  goto error;
1085 
1086  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1087  avio_skip(pb, desc_len - ret);
1088  if (*desc)
1089  av_dict_set(&st->metadata, "title", desc, 0);
1090 
1091  avio_rl16(pb); /* flags? */
1092  avio_rl32(pb); /* data size */
1093 
1094  size = pb->buf_end - pb->buf_ptr;
1095  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1096  .buf_size = size };
1097  if (!pd.buf)
1098  goto error;
1099  memcpy(pd.buf, pb->buf_ptr, size);
1100  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1101  av_freep(&pd.buf);
1102  if (!sub_demuxer)
1103  goto error;
1104 
1105  if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1106  goto error;
1107 
1108  if (!(ast->sub_ctx = avformat_alloc_context()))
1109  goto error;
1110 
1111  ast->sub_ctx->pb = pb;
1112 
1113  if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1114  goto error;
1115 
1116  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1117  if (ast->sub_ctx->nb_streams != 1)
1118  goto error;
1119  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1121  time_base = ast->sub_ctx->streams[0]->time_base;
1122  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1123  }
1124  ast->sub_buffer = pkt->buf;
1125  pkt->buf = NULL;
1126  av_packet_unref(pkt);
1127  return 1;
1128 
1129 error:
1130  av_freep(&ast->sub_ctx);
1131  avio_context_free(&pb);
1132  }
1133  return 0;
1134 }
1135 
1137  AVPacket *pkt)
1138 {
1139  AVIStream *ast, *next_ast = next_st->priv_data;
1140  int64_t ts, next_ts, ts_min = INT64_MAX;
1141  AVStream *st, *sub_st = NULL;
1142  int i;
1143 
1144  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1145  AV_TIME_BASE_Q);
1146 
1147  for (i = 0; i < s->nb_streams; i++) {
1148  st = s->streams[i];
1149  ast = st->priv_data;
1150  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1151  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1152  if (ts <= next_ts && ts < ts_min) {
1153  ts_min = ts;
1154  sub_st = st;
1155  }
1156  }
1157  }
1158 
1159  if (sub_st) {
1160  ast = sub_st->priv_data;
1161  *pkt = ast->sub_pkt;
1162  pkt->stream_index = sub_st->index;
1163 
1164  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1165  ast->sub_pkt.data = NULL;
1166  }
1167  return sub_st;
1168 }
1169 
1170 static int get_stream_idx(const unsigned *d)
1171 {
1172  if (d[0] >= '0' && d[0] <= '9' &&
1173  d[1] >= '0' && d[1] <= '9') {
1174  return (d[0] - '0') * 10 + (d[1] - '0');
1175  } else {
1176  return 100; // invalid stream ID
1177  }
1178 }
1179 
1180 /**
1181  *
1182  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1183  */
1184 static int avi_sync(AVFormatContext *s, int exit_early)
1185 {
1186  AVIContext *avi = s->priv_data;
1187  AVIOContext *pb = s->pb;
1188  int n;
1189  unsigned int d[8];
1190  unsigned int size;
1191  int64_t i, sync;
1192 
1193 start_sync:
1194  memset(d, -1, sizeof(d));
1195  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1196  int j;
1197 
1198  for (j = 0; j < 7; j++)
1199  d[j] = d[j + 1];
1200  d[7] = avio_r8(pb);
1201 
1202  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1203 
1204  n = get_stream_idx(d + 2);
1205  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1206  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1207  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1208  continue;
1209 
1210  // parse ix##
1211  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1212  // parse JUNK
1213  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1214  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1215  (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1216  avio_skip(pb, size);
1217  goto start_sync;
1218  }
1219 
1220  // parse stray LIST
1221  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1222  avio_skip(pb, 4);
1223  goto start_sync;
1224  }
1225 
1226  n = get_stream_idx(d);
1227 
1228  if (!((i - avi->last_pkt_pos) & 1) &&
1229  get_stream_idx(d + 1) < s->nb_streams)
1230  continue;
1231 
1232  // detect ##ix chunk and skip
1233  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1234  avio_skip(pb, size);
1235  goto start_sync;
1236  }
1237 
1238  if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1239  avio_skip(pb, 16 * 3 + 8);
1240  goto start_sync;
1241  }
1242 
1243  if (avi->dv_demux && n != 0)
1244  continue;
1245 
1246  // parse ##dc/##wb
1247  if (n < s->nb_streams) {
1248  AVStream *st;
1249  AVIStream *ast;
1250  st = s->streams[n];
1251  ast = st->priv_data;
1252 
1253  if (!ast) {
1254  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1255  continue;
1256  }
1257 
1258  if (s->nb_streams >= 2) {
1259  AVStream *st1 = s->streams[1];
1260  AVIStream *ast1 = st1->priv_data;
1261  // workaround for broken small-file-bug402.avi
1262  if ( d[2] == 'w' && d[3] == 'b'
1263  && n == 0
1264  && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1266  && ast->prefix == 'd'*256+'c'
1267  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1268  ) {
1269  n = 1;
1270  st = st1;
1271  ast = ast1;
1273  "Invalid stream + prefix combination, assuming audio.\n");
1274  }
1275  }
1276 
1277  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1278  int k = avio_r8(pb);
1279  int last = (k + avio_r8(pb) - 1) & 0xFF;
1280 
1281  avio_rl16(pb); // flags
1282 
1283  // b + (g << 8) + (r << 16);
1284  for (; k <= last; k++)
1285  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1286 
1287  ast->has_pal = 1;
1288  goto start_sync;
1289  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1290  d[2] < 128 && d[3] < 128) ||
1291  d[2] * 256 + d[3] == ast->prefix /* ||
1292  (d[2] == 'd' && d[3] == 'c') ||
1293  (d[2] == 'w' && d[3] == 'b') */) {
1294  if (exit_early)
1295  return 0;
1296  if (d[2] * 256 + d[3] == ast->prefix)
1297  ast->prefix_count++;
1298  else {
1299  ast->prefix = d[2] * 256 + d[3];
1300  ast->prefix_count = 0;
1301  }
1302 
1303  if (!avi->dv_demux &&
1304  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1305  // FIXME: needs a little reordering
1306  (st->discard >= AVDISCARD_NONKEY &&
1307  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1308  || st->discard >= AVDISCARD_ALL)) {
1309 
1310  ast->frame_offset += get_duration(ast, size);
1311  avio_skip(pb, size);
1312  goto start_sync;
1313  }
1314 
1315  avi->stream_index = n;
1316  ast->packet_size = size + 8;
1317  ast->remaining = size;
1318 
1319  if (size) {
1320  uint64_t pos = avio_tell(pb) - 8;
1321  if (!st->index_entries || !st->nb_index_entries ||
1322  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1323  av_add_index_entry(st, pos, ast->frame_offset, size,
1324  0, AVINDEX_KEYFRAME);
1325  }
1326  }
1327  return 0;
1328  }
1329  }
1330  }
1331 
1332  if (pb->error)
1333  return pb->error;
1334  return AVERROR_EOF;
1335 }
1336 
1338 {
1339  AVIContext *avi = s->priv_data;
1340  int best_stream_index = 0;
1341  AVStream *best_st = NULL;
1342  AVIStream *best_ast;
1343  int64_t best_ts = INT64_MAX;
1344  int i;
1345 
1346  for (i = 0; i < s->nb_streams; i++) {
1347  AVStream *st = s->streams[i];
1348  AVIStream *ast = st->priv_data;
1349  int64_t ts = ast->frame_offset;
1350  int64_t last_ts;
1351 
1352  if (!st->nb_index_entries)
1353  continue;
1354 
1355  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1356  if (!ast->remaining && ts > last_ts)
1357  continue;
1358 
1359  ts = av_rescale_q(ts, st->time_base,
1360  (AVRational) { FFMAX(1, ast->sample_size),
1361  AV_TIME_BASE });
1362 
1363  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1364  st->time_base.num, st->time_base.den, ast->frame_offset);
1365  if (ts < best_ts) {
1366  best_ts = ts;
1367  best_st = st;
1368  best_stream_index = i;
1369  }
1370  }
1371  if (!best_st)
1372  return AVERROR_EOF;
1373 
1374  best_ast = best_st->priv_data;
1375  best_ts = best_ast->frame_offset;
1376  if (best_ast->remaining) {
1377  i = av_index_search_timestamp(best_st,
1378  best_ts,
1379  AVSEEK_FLAG_ANY |
1381  } else {
1382  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1383  if (i >= 0)
1384  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1385  }
1386 
1387  if (i >= 0) {
1388  int64_t pos = best_st->index_entries[i].pos;
1389  pos += best_ast->packet_size - best_ast->remaining;
1390  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1391  return AVERROR_EOF;
1392 
1393  av_assert0(best_ast->remaining <= best_ast->packet_size);
1394 
1395  avi->stream_index = best_stream_index;
1396  if (!best_ast->remaining)
1397  best_ast->packet_size =
1398  best_ast->remaining = best_st->index_entries[i].size;
1399  }
1400  else
1401  return AVERROR_EOF;
1402 
1403  return 0;
1404 }
1405 
1407 {
1408  AVIContext *avi = s->priv_data;
1409  AVIOContext *pb = s->pb;
1410  int err;
1411 
1412  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1413  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1414  if (size >= 0)
1415  return size;
1416  else
1417  goto resync;
1418  }
1419 
1420  if (avi->non_interleaved) {
1421  err = ni_prepare_read(s);
1422  if (err < 0)
1423  return err;
1424  }
1425 
1426 resync:
1427  if (avi->stream_index >= 0) {
1428  AVStream *st = s->streams[avi->stream_index];
1429  AVIStream *ast = st->priv_data;
1430  int size, err;
1431 
1432  if (get_subtitle_pkt(s, st, pkt))
1433  return 0;
1434 
1435  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1436  if (ast->sample_size <= 1)
1437  size = INT_MAX;
1438  else if (ast->sample_size < 32)
1439  // arbitrary multiplier to avoid tiny packets for raw PCM data
1440  size = 1024 * ast->sample_size;
1441  else
1442  size = ast->sample_size;
1443 
1444  if (size > ast->remaining)
1445  size = ast->remaining;
1446  avi->last_pkt_pos = avio_tell(pb);
1447  err = av_get_packet(pb, pkt, size);
1448  if (err < 0)
1449  return err;
1450  size = err;
1451 
1452  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1453  uint8_t *pal;
1454  pal = av_packet_new_side_data(pkt,
1456  AVPALETTE_SIZE);
1457  if (!pal) {
1458  av_log(s, AV_LOG_ERROR,
1459  "Failed to allocate data for palette\n");
1460  } else {
1461  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1462  ast->has_pal = 0;
1463  }
1464  }
1465 
1466  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1467  AVBufferRef *avbuf = pkt->buf;
1468  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1469  pkt->data, pkt->size, pkt->pos);
1470  pkt->buf = avbuf;
1471  pkt->flags |= AV_PKT_FLAG_KEY;
1472  if (size < 0)
1473  av_packet_unref(pkt);
1474  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1475  !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1476  ast->frame_offset++;
1477  avi->stream_index = -1;
1478  ast->remaining = 0;
1479  goto resync;
1480  } else {
1481  /* XXX: How to handle B-frames in AVI? */
1482  pkt->dts = ast->frame_offset;
1483 // pkt->dts += ast->start;
1484  if (ast->sample_size)
1485  pkt->dts /= ast->sample_size;
1486  pkt->stream_index = avi->stream_index;
1487 
1488  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1489  AVIndexEntry *e;
1490  int index;
1491 
1493  e = &st->index_entries[index];
1494 
1495  if (index >= 0 && e->timestamp == ast->frame_offset) {
1496  if (index == st->nb_index_entries-1) {
1497  int key=1;
1498  uint32_t state=-1;
1499  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1500  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1501  while (ptr < end) {
1502  ptr = avpriv_find_start_code(ptr, end, &state);
1503  if (state == 0x1B6 && ptr < end) {
1504  key = !(*ptr & 0xC0);
1505  break;
1506  }
1507  }
1508  }
1509  if (!key)
1510  e->flags &= ~AVINDEX_KEYFRAME;
1511  }
1512  if (e->flags & AVINDEX_KEYFRAME)
1513  pkt->flags |= AV_PKT_FLAG_KEY;
1514  }
1515  } else {
1516  pkt->flags |= AV_PKT_FLAG_KEY;
1517  }
1518  ast->frame_offset += get_duration(ast, pkt->size);
1519  }
1520  ast->remaining -= err;
1521  if (!ast->remaining) {
1522  avi->stream_index = -1;
1523  ast->packet_size = 0;
1524  }
1525 
1526  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1527  av_packet_unref(pkt);
1528  goto resync;
1529  }
1530  ast->seek_pos= 0;
1531 
1532  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1533  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1534 
1535  if (avi->dts_max < dts) {
1536  avi->dts_max = dts;
1537  } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1538  avi->non_interleaved= 1;
1539  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1540  }
1541  }
1542 
1543  return 0;
1544  }
1545 
1546  if ((err = avi_sync(s, 0)) < 0)
1547  return err;
1548  goto resync;
1549 }
1550 
1551 /* XXX: We make the implicit supposition that the positions are sorted
1552  * for each stream. */
1554 {
1555  AVIContext *avi = s->priv_data;
1556  AVIOContext *pb = s->pb;
1557  int nb_index_entries, i;
1558  AVStream *st;
1559  AVIStream *ast;
1560  int64_t pos;
1561  unsigned int index, tag, flags, len, first_packet = 1;
1562  int64_t last_pos = -1;
1563  unsigned last_idx = -1;
1564  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1565  int anykey = 0;
1566 
1567  nb_index_entries = size / 16;
1568  if (nb_index_entries <= 0)
1569  return AVERROR_INVALIDDATA;
1570 
1571  idx1_pos = avio_tell(pb);
1572  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1573  if (avi_sync(s, 1) == 0)
1574  first_packet_pos = avio_tell(pb) - 8;
1575  avi->stream_index = -1;
1576  avio_seek(pb, idx1_pos, SEEK_SET);
1577 
1578  if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1579  first_packet_pos = 0;
1580  data_offset = avi->movi_list;
1581  }
1582 
1583  /* Read the entries and sort them in each stream component. */
1584  for (i = 0; i < nb_index_entries; i++) {
1585  if (avio_feof(pb))
1586  return -1;
1587 
1588  tag = avio_rl32(pb);
1589  flags = avio_rl32(pb);
1590  pos = avio_rl32(pb);
1591  len = avio_rl32(pb);
1592  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1593  i, tag, flags, pos, len);
1594 
1595  index = ((tag & 0xff) - '0') * 10;
1596  index += (tag >> 8 & 0xff) - '0';
1597  if (index >= s->nb_streams)
1598  continue;
1599  st = s->streams[index];
1600  ast = st->priv_data;
1601 
1602  /* Skip 'xxpc' palette change entries in the index until a logic
1603  * to process these is properly implemented. */
1604  if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1605  continue;
1606 
1607  if (first_packet && first_packet_pos) {
1608  if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1609  data_offset = first_packet_pos - pos;
1610  first_packet = 0;
1611  }
1612  pos += data_offset;
1613 
1614  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1615 
1616  // even if we have only a single stream, we should
1617  // switch to non-interleaved to get correct timestamps
1618  if (last_pos == pos)
1619  avi->non_interleaved = 1;
1620  if (last_idx != pos && len) {
1621  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1622  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1623  last_idx= pos;
1624  }
1625  ast->cum_len += get_duration(ast, len);
1626  last_pos = pos;
1627  anykey |= flags&AVIIF_INDEX;
1628  }
1629  if (!anykey) {
1630  for (index = 0; index < s->nb_streams; index++) {
1631  st = s->streams[index];
1632  if (st->nb_index_entries)
1634  }
1635  }
1636  return 0;
1637 }
1638 
1639 /* Scan the index and consider any file with streams more than
1640  * 2 seconds or 64MB apart non-interleaved. */
1642 {
1643  int64_t min_pos, pos;
1644  int i;
1645  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1646  if (!idx)
1647  return AVERROR(ENOMEM);
1648  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1649  int64_t max_dts = INT64_MIN / 2;
1650  int64_t min_dts = INT64_MAX / 2;
1651  int64_t max_buffer = 0;
1652 
1653  min_pos = INT64_MAX;
1654 
1655  for (i = 0; i < s->nb_streams; i++) {
1656  AVStream *st = s->streams[i];
1657  AVIStream *ast = st->priv_data;
1658  int n = st->nb_index_entries;
1659  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1660  idx[i]++;
1661  if (idx[i] < n) {
1662  int64_t dts;
1663  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1664  FFMAX(ast->sample_size, 1),
1665  st->time_base, AV_TIME_BASE_Q);
1666  min_dts = FFMIN(min_dts, dts);
1667  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1668  }
1669  }
1670  for (i = 0; i < s->nb_streams; i++) {
1671  AVStream *st = s->streams[i];
1672  AVIStream *ast = st->priv_data;
1673 
1674  if (idx[i] && min_dts != INT64_MAX / 2) {
1675  int64_t dts;
1676  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1677  FFMAX(ast->sample_size, 1),
1678  st->time_base, AV_TIME_BASE_Q);
1679  max_dts = FFMAX(max_dts, dts);
1680  max_buffer = FFMAX(max_buffer,
1681  av_rescale(dts - min_dts,
1682  st->codecpar->bit_rate,
1683  AV_TIME_BASE));
1684  }
1685  }
1686  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1687  max_buffer > 1024 * 1024 * 8 * 8) {
1688  av_free(idx);
1689  return 1;
1690  }
1691  }
1692  av_free(idx);
1693  return 0;
1694 }
1695 
1697 {
1698  int i;
1699  int64_t last_start = 0;
1700  int64_t first_end = INT64_MAX;
1701  int64_t oldpos = avio_tell(s->pb);
1702 
1703  for (i = 0; i < s->nb_streams; i++) {
1704  AVStream *st = s->streams[i];
1705  int n = st->nb_index_entries;
1706  unsigned int size;
1707 
1708  if (n <= 0)
1709  continue;
1710 
1711  if (n >= 2) {
1712  int64_t pos = st->index_entries[0].pos;
1713  unsigned tag[2];
1714  avio_seek(s->pb, pos, SEEK_SET);
1715  tag[0] = avio_r8(s->pb);
1716  tag[1] = avio_r8(s->pb);
1717  avio_rl16(s->pb);
1718  size = avio_rl32(s->pb);
1719  if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1720  last_start = INT64_MAX;
1721  if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1722  last_start = INT64_MAX;
1723  }
1724 
1725  if (st->index_entries[0].pos > last_start)
1726  last_start = st->index_entries[0].pos;
1727  if (st->index_entries[n - 1].pos < first_end)
1728  first_end = st->index_entries[n - 1].pos;
1729  }
1730  avio_seek(s->pb, oldpos, SEEK_SET);
1731 
1732  if (last_start > first_end)
1733  return 1;
1734 
1735  return check_stream_max_drift(s);
1736 }
1737 
1739 {
1740  AVIContext *avi = s->priv_data;
1741  AVIOContext *pb = s->pb;
1742  uint32_t tag, size;
1743  int64_t pos = avio_tell(pb);
1744  int64_t next;
1745  int ret = -1;
1746 
1747  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1748  goto the_end; // maybe truncated file
1749  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1750  for (;;) {
1751  tag = avio_rl32(pb);
1752  size = avio_rl32(pb);
1753  if (avio_feof(pb))
1754  break;
1755  next = avio_tell(pb) + size + (size & 1);
1756 
1757  if (tag == MKTAG('i', 'd', 'x', '1') &&
1758  avi_read_idx1(s, size) >= 0) {
1759  avi->index_loaded=2;
1760  ret = 0;
1761  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1762  uint32_t tag1 = avio_rl32(pb);
1763 
1764  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1765  ff_read_riff_info(s, size - 4);
1766  }else if (!ret)
1767  break;
1768 
1769  if (avio_seek(pb, next, SEEK_SET) < 0)
1770  break; // something is wrong here
1771  }
1772 
1773 the_end:
1774  avio_seek(pb, pos, SEEK_SET);
1775  return ret;
1776 }
1777 
1778 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1779 {
1780  AVIStream *ast2 = st2->priv_data;
1781  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1782  av_packet_unref(&ast2->sub_pkt);
1783  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1784  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1785  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1786 }
1787 
1788 static int avi_read_seek(AVFormatContext *s, int stream_index,
1789  int64_t timestamp, int flags)
1790 {
1791  AVIContext *avi = s->priv_data;
1792  AVStream *st;
1793  int i, index;
1794  int64_t pos, pos_min;
1795  AVIStream *ast;
1796 
1797  /* Does not matter which stream is requested dv in avi has the
1798  * stream information in the first video stream.
1799  */
1800  if (avi->dv_demux)
1801  stream_index = 0;
1802 
1803  if (!avi->index_loaded) {
1804  /* we only load the index on demand */
1805  avi_load_index(s);
1806  avi->index_loaded |= 1;
1807  }
1808  av_assert0(stream_index >= 0);
1809 
1810  st = s->streams[stream_index];
1811  ast = st->priv_data;
1812  index = av_index_search_timestamp(st,
1813  timestamp * FFMAX(ast->sample_size, 1),
1814  flags);
1815  if (index < 0) {
1816  if (st->nb_index_entries > 0)
1817  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1818  timestamp * FFMAX(ast->sample_size, 1),
1819  st->index_entries[0].timestamp,
1821  return AVERROR_INVALIDDATA;
1822  }
1823 
1824  /* find the position */
1825  pos = st->index_entries[index].pos;
1826  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1827 
1828  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1829  timestamp, index, st->index_entries[index].timestamp);
1830 
1831  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1832  /* One and only one real stream for DV in AVI, and it has video */
1833  /* offsets. Calling with other stream indexes should have failed */
1834  /* the av_index_search_timestamp call above. */
1835 
1836  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1837  return -1;
1838 
1839  /* Feed the DV video stream version of the timestamp to the */
1840  /* DV demux so it can synthesize correct timestamps. */
1841  ff_dv_offset_reset(avi->dv_demux, timestamp);
1842 
1843  avi->stream_index = -1;
1844  return 0;
1845  }
1846 
1847  pos_min = pos;
1848  for (i = 0; i < s->nb_streams; i++) {
1849  AVStream *st2 = s->streams[i];
1850  AVIStream *ast2 = st2->priv_data;
1851 
1852  ast2->packet_size =
1853  ast2->remaining = 0;
1854 
1855  if (ast2->sub_ctx) {
1856  seek_subtitle(st, st2, timestamp);
1857  continue;
1858  }
1859 
1860  if (st2->nb_index_entries <= 0)
1861  continue;
1862 
1863 // av_assert1(st2->codecpar->block_align);
1864  index = av_index_search_timestamp(st2,
1865  av_rescale_q(timestamp,
1866  st->time_base,
1867  st2->time_base) *
1868  FFMAX(ast2->sample_size, 1),
1869  flags |
1872  if (index < 0)
1873  index = 0;
1874  ast2->seek_pos = st2->index_entries[index].pos;
1875  pos_min = FFMIN(pos_min,ast2->seek_pos);
1876  }
1877  for (i = 0; i < s->nb_streams; i++) {
1878  AVStream *st2 = s->streams[i];
1879  AVIStream *ast2 = st2->priv_data;
1880 
1881  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1882  continue;
1883 
1884  index = av_index_search_timestamp(
1885  st2,
1886  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1888  if (index < 0)
1889  index = 0;
1890  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1891  index--;
1892  ast2->frame_offset = st2->index_entries[index].timestamp;
1893  }
1894 
1895  /* do the seek */
1896  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1897  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1898  return -1;
1899  }
1900  avi->stream_index = -1;
1901  avi->dts_max = INT_MIN;
1902  return 0;
1903 }
1904 
1906 {
1907  int i;
1908  AVIContext *avi = s->priv_data;
1909 
1910  for (i = 0; i < s->nb_streams; i++) {
1911  AVStream *st = s->streams[i];
1912  AVIStream *ast = st->priv_data;
1913  if (ast) {
1914  if (ast->sub_ctx) {
1915  av_freep(&ast->sub_ctx->pb);
1917  }
1918  av_buffer_unref(&ast->sub_buffer);
1919  av_packet_unref(&ast->sub_pkt);
1920  }
1921  }
1922 
1923  av_freep(&avi->dv_demux);
1924 
1925  return 0;
1926 }
1927 
1928 static int avi_probe(const AVProbeData *p)
1929 {
1930  int i;
1931 
1932  /* check file header */
1933  for (i = 0; avi_headers[i][0]; i++)
1934  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1935  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1936  return AVPROBE_SCORE_MAX;
1937 
1938  return 0;
1939 }
1940 
1942  .name = "avi",
1943  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1944  .priv_data_size = sizeof(AVIContext),
1945  .extensions = "avi",
1946  .read_probe = avi_probe,
1951  .priv_class = &demuxer_class,
1952 };
const char * name
Definition: avisynth_c.h:867
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:230
static AVStream * get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt)
Definition: avidec.c:1136
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2511
#define ff_tlog(ctx,...)
Definition: internal.h:75
#define NULL
Definition: coverity.c:32
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:802
uint32_t handler
Definition: avidec.c:48
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:336
uint32_t pal[256]
Definition: avidec.c:57
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
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
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:2052
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3142
AVFormatContext * sub_ctx
Definition: avidec.c:62
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h: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:84
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1497
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:4903
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:164
const char * desc
Definition: nvenc.c:68
int64_t pos
Definition: avformat.h:810
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2513
int64_t last_pkt_pos
Definition: avidec.c:76
uint32_t rate
Definition: avidec.c:50
#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: avcodec.h:3957
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:943
int dshow_block_align
Definition: avidec.c:59
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:882
int size
Definition: avcodec.h:1478
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:460
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1110
int is_odml
Definition: avidec.c:78
enum AVMediaType codec_type
Definition: rtp.c:37
int64_t movi_end
Definition: avidec.c:72
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
uint32_t scale
Definition: avidec.c:49
#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:537
static int get_duration(AVIStream *ast, int len)
Definition: avidec.c:124
void * priv_data
Definition: avformat.h:896
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
#define AVIIF_INDEX
Definition: avi.h:38
const char * key
discard all
Definition: avcodec.h:811
static AVPacket pkt
static int ni_prepare_read(AVFormatContext *s)
Definition: avidec.c:1337
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:1641
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:112
uint8_t base
Definition: vp3data.h:202
Format I/O context.
Definition: avformat.h:1358
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:1491
Public dictionary API.
int stream_index
Definition: avidec.c:80
static char buffer[20]
Definition: seek.c:32
uint8_t
static int nb_streams
Definition: ffprobe.c:280
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:203
int width
Video only.
Definition: avcodec.h:4023
AVOptions.
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1905
int64_t riff_end
Definition: avidec.c:71
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:800
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
int use_odml
Definition: avidec.c:83
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
enum AVStreamParseType need_parsing
Definition: avformat.h:1099
int id
Format-specific stream ID.
Definition: avformat.h:888
int64_t movi_list
Definition: avidec.c:75
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4476
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
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:267
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:1489
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:324
uint8_t * data
Definition: avcodec.h:1477
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
Definition: avidec.c:1066
uint32_t tag
Definition: movenc.c:1496
#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:310
const AVCodecTag ff_codec_bmp_tags_unofficial[]
Definition: riff.c:494
#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:647
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: avcodec.h:3986
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1509
int packet_size
Definition: avidec.c:46
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#define U(x)
Definition: vp56_arith.h:37
#define ff_const59
The ff_const59 define is not part of the public API and will be removed without further warning...
Definition: avformat.h:549
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AVINDEX_KEYFRAME
Definition: avformat.h:817
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:131
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:259
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2040
#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:1598
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: avcodec.h:1190
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2163
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:769
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
int remaining
Definition: avidec.c:45
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:811
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:565
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3953
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1460
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
Definition: avidec.c:295
simple assert() macros that are a bit more flexible than ISO C assert().
static int get_stream_idx(const unsigned *d)
Definition: avidec.c:1170
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:954
#define FFMAX(a, b)
Definition: common.h:94
#define fail()
Definition: checkasm.h:120
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1483
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3975
Only parse headers, do not repack.
Definition: avformat.h:801
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:638
struct AVStream::@247 * info
Stream information used internally by avformat_find_stream_info()
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
int prefix_count
Definition: avidec.c:56
AVBufferRef * sub_buffer
Definition: avidec.c:64
int non_interleaved
Definition: avidec.c:79
int block_align
Audio only.
Definition: avcodec.h:4074
static int avi_probe(const AVProbeData *p)
Definition: avidec.c:1928
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
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:54
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:466
static struct @313 state
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static const char months[12][4]
Definition: avidec.c:319
#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:1778
static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
Definition: avidec.c:384
#define AVFMT_FLAG_SORT_DTS
try to interleave outputted packets by dts (using this flag can slow demuxing down) ...
Definition: avformat.h:1510
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2705
int n
Definition: avisynth_c.h:760
AVDictionary * metadata
Definition: avformat.h:945
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
if(ret< 0)
Definition: vf_mcdeint.c:279
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:220
static void error(const char *err)
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
Read a transport packet from a media file.
Definition: utils.c:836
static int calculate_bitrate(AVFormatContext *s)
Definition: avidec.c:422
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static const char avi_headers[][8]
Definition: avidec.c:103
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avidec.c:1406
int prefix
Definition: avidec.c:55
#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
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1238
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:1400
static int resync(AVFormatContext *s)
Definition: flvdec.c:949
int index_loaded
Definition: avidec.c:77
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:599
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: avformat.h:1049
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:1112
double value
Definition: eval.c:98
static const AVOption options[]
Definition: avidec.c:89
Describe the class of an AVClass context structure.
Definition: log.h:67
static int avi_read_idx1(AVFormatContext *s, int size)
Definition: avidec.c:1553
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:277
byte swapping routines
discard useless packets like 0 size packets in avi
Definition: avcodec.h:806
#define snprintf
Definition: snprintf.h:34
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
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:446
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:2544
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:583
int64_t seek_pos
Definition: avidec.c:66
#define flags(name, subs,...)
Definition: cbs_av1.c:564
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1738
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1941
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
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:458
int64_t io_fsize
Definition: avidec.c:74
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:94
full parsing and repack
Definition: avformat.h:800
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:753
Main libavformat public API header.
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
Definition: avidec.c:341
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
Definition: avidec.c:322
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal api header.
AVPacket sub_pkt
Definition: avidec.c:63
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:920
#define CONFIG_DV_DEMUXER
Definition: config.h:2069
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1625
static int get_riff(AVFormatContext *s, AVIOContext *pb)
Definition: avidec.c:134
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:148
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:3323
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:932
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:211
int sample_size
Definition: avidec.c:51
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4448
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:790
#define av_free(p)
char * value
Definition: dict.h:87
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
int len
int has_pal
Definition: avidec.c:58
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1696
void * priv_data
Format private data.
Definition: avformat.h:1386
#define print_tag(str, tag, size)
Definition: avidec.c:120
int64_t frame_offset
Definition: avidec.c:43
int64_t dts_max
Definition: avidec.c:85
int64_t fsize
Definition: avidec.c:73
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3999
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3971
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:172
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1476
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1788
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1473
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3961
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:329
int stream_index
Definition: avcodec.h:1479
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:910
static int read_odml_index(AVFormatContext *s, int frame_num)
Definition: avidec.c:159
#define MKTAG(a, b, c, d)
Definition: common.h:366
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:936
int odml_depth
Definition: avidec.c:82
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1139
This structure stores compressed data.
Definition: avcodec.h:1454
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:777
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:1184
#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:191
DVDemuxContext * dv_demux
Definition: avidec.c:81