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avidec.c
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1 /*
2  * AVI demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <inttypes.h>
23 
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bswap.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/mathematics.h"
32 #include "avformat.h"
33 #include "avi.h"
34 #include "dv.h"
35 #include "internal.h"
36 #include "isom.h"
37 #include "riff.h"
38 #include "libavcodec/bytestream.h"
39 #include "libavcodec/exif.h"
40 #include "libavcodec/internal.h"
41 
42 typedef struct AVIStream {
43  int64_t frame_offset; /* current frame (video) or byte (audio) counter
44  * (used to compute the pts) */
45  int remaining;
47 
48  uint32_t handler;
49  uint32_t scale;
50  uint32_t rate;
51  int sample_size; /* size of one sample (or packet)
52  * (in the rate/scale sense) in bytes */
53 
54  int64_t cum_len; /* temporary storage (used during seek) */
55  int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
57  uint32_t pal[256];
58  int has_pal;
59  int dshow_block_align; /* block align variable used to emulate bugs in
60  * the MS dshow demuxer */
61 
65 
66  int64_t seek_pos;
67 } AVIStream;
68 
69 typedef struct AVIContext {
70  const AVClass *class;
71  int64_t riff_end;
72  int64_t movi_end;
73  int64_t fsize;
74  int64_t io_fsize;
75  int64_t movi_list;
76  int64_t last_pkt_pos;
78  int is_odml;
83  int use_odml;
84 #define MAX_ODML_DEPTH 1000
85  int64_t dts_max;
86 } AVIContext;
87 
88 
89 static const AVOption options[] = {
90  { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
91  { NULL },
92 };
93 
94 static const AVClass demuxer_class = {
95  .class_name = "avi",
96  .item_name = av_default_item_name,
97  .option = options,
98  .version = LIBAVUTIL_VERSION_INT,
99  .category = AV_CLASS_CATEGORY_DEMUXER,
100 };
101 
102 
103 static const char avi_headers[][8] = {
104  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
105  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
106  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
107  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
108  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
109  { 0 }
110 };
111 
113  { "strn", "title" },
114  { 0 },
115 };
116 
117 static int avi_load_index(AVFormatContext *s);
118 static int guess_ni_flag(AVFormatContext *s);
119 
120 #define print_tag(str, tag, size) \
121  av_log(NULL, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%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  bytestream2_init(&gb, data + offset, data_size - offset);
405 
406  // decode EXIF tags from IFD, AVI is always little-endian
407  return avpriv_exif_decode_ifd(s, &gb, 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 <= INT_MAX && 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*ast->scale/ast->rate > 3600) {
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  /* This is needed to get the pict type which is necessary
819  * for generating correct pts. */
821 
822  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
823  ast->handler == MKTAG('X', 'V', 'I', 'D'))
824  st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
825 
826  if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
828  if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
830 
831  if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
832  st->codecpar->extradata_size < 1U << 30) {
833  st->codecpar->extradata_size += 9;
834  if ((ret = av_reallocp(&st->codecpar->extradata,
835  st->codecpar->extradata_size +
837  st->codecpar->extradata_size = 0;
838  return ret;
839  } else
840  memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
841  "BottomUp", 9);
842  }
843  st->codecpar->height = FFABS(st->codecpar->height);
844 
845 // avio_skip(pb, size - 5 * 4);
846  break;
847  case AVMEDIA_TYPE_AUDIO:
848  ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
849  if (ret < 0)
850  return ret;
852  if (ast->sample_size && st->codecpar->block_align &&
853  ast->sample_size != st->codecpar->block_align) {
854  av_log(s,
856  "sample size (%d) != block align (%d)\n",
857  ast->sample_size,
858  st->codecpar->block_align);
859  ast->sample_size = st->codecpar->block_align;
860  }
861  /* 2-aligned
862  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
863  if (size & 1)
864  avio_skip(pb, 1);
865  /* Force parsing as several audio frames can be in
866  * one packet and timestamps refer to packet start. */
868  /* ADTS header is in extradata, AAC without header must be
869  * stored as exact frames. Parser not needed and it will
870  * fail. */
871  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
874  // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
875  if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
877  /* AVI files with Xan DPCM audio (wrongly) declare PCM
878  * audio in the header but have Axan as stream_code_tag. */
879  if (ast->handler == AV_RL32("Axan")) {
881  st->codecpar->codec_tag = 0;
882  ast->dshow_block_align = 0;
883  }
884  if (amv_file_format) {
886  ast->dshow_block_align = 0;
887  }
888  if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
890  st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
891  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
892  ast->dshow_block_align = 0;
893  }
894  if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
895  st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
896  st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
897  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
898  ast->sample_size = 0;
899  }
900  break;
903  st->request_probe= 1;
904  avio_skip(pb, size);
905  break;
906  default:
909  st->codecpar->codec_tag = 0;
910  avio_skip(pb, size);
911  break;
912  }
913  }
914  break;
915  case MKTAG('s', 't', 'r', 'd'):
916  if (stream_index >= (unsigned)s->nb_streams
917  || s->streams[stream_index]->codecpar->extradata_size
918  || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
919  avio_skip(pb, size);
920  } else {
921  uint64_t cur_pos = avio_tell(pb);
922  if (cur_pos < list_end)
923  size = FFMIN(size, list_end - cur_pos);
924  st = s->streams[stream_index];
925 
926  if (size<(1<<30)) {
927  if (st->codecpar->extradata) {
928  av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
929  av_freep(&st->codecpar->extradata);
930  }
931  if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
932  return AVERROR(ENOMEM);
933  }
934 
935  if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
936  avio_r8(pb);
937 
938  ret = avi_extract_stream_metadata(s, st);
939  if (ret < 0) {
940  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
941  }
942  }
943  break;
944  case MKTAG('i', 'n', 'd', 'x'):
945  pos = avio_tell(pb);
946  if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
947  avi->use_odml &&
948  read_odml_index(s, 0) < 0 &&
950  goto fail;
951  avio_seek(pb, pos + size, SEEK_SET);
952  break;
953  case MKTAG('v', 'p', 'r', 'p'):
954  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
955  AVRational active, active_aspect;
956 
957  st = s->streams[stream_index];
958  avio_rl32(pb);
959  avio_rl32(pb);
960  avio_rl32(pb);
961  avio_rl32(pb);
962  avio_rl32(pb);
963 
964  active_aspect.den = avio_rl16(pb);
965  active_aspect.num = avio_rl16(pb);
966  active.num = avio_rl32(pb);
967  active.den = avio_rl32(pb);
968  avio_rl32(pb); // nbFieldsPerFrame
969 
970  if (active_aspect.num && active_aspect.den &&
971  active.num && active.den) {
972  st->sample_aspect_ratio = av_div_q(active_aspect, active);
973  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
974  active_aspect.num, active_aspect.den,
975  active.num, active.den);
976  }
977  size -= 9 * 4;
978  }
979  avio_skip(pb, size);
980  break;
981  case MKTAG('s', 't', 'r', 'n'):
982  if (s->nb_streams) {
983  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
984  if (ret < 0)
985  return ret;
986  break;
987  }
988  default:
989  if (size > 1000000) {
990  av_log(s, AV_LOG_ERROR,
991  "Something went wrong during header parsing, "
992  "tag %s has size %u, "
993  "I will ignore it and try to continue anyway.\n",
994  av_fourcc2str(tag), size);
996  goto fail;
997  avi->movi_list = avio_tell(pb) - 4;
998  avi->movi_end = avi->fsize;
999  goto end_of_header;
1000  }
1001  /* Do not fail for very large idx1 tags */
1002  case MKTAG('i', 'd', 'x', '1'):
1003  /* skip tag */
1004  size += (size & 1);
1005  avio_skip(pb, size);
1006  break;
1007  }
1008  }
1009 
1010 end_of_header:
1011  /* check stream number */
1012  if (stream_index != s->nb_streams - 1) {
1013 
1014 fail:
1015  return AVERROR_INVALIDDATA;
1016  }
1017 
1018  if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1019  avi_load_index(s);
1020  calculate_bitrate(s);
1021  avi->index_loaded |= 1;
1022 
1023  if ((ret = guess_ni_flag(s)) < 0)
1024  return ret;
1025 
1026  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1027 
1028  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1029  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1030  for (i = 0; i < s->nb_streams; i++) {
1031  AVStream *st = s->streams[i];
1035  }
1036 
1037  for (i = 0; i < s->nb_streams; i++) {
1038  AVStream *st = s->streams[i];
1039  if (st->nb_index_entries)
1040  break;
1041  }
1042  // DV-in-AVI cannot be non-interleaved, if set this must be
1043  // a mis-detection.
1044  if (avi->dv_demux)
1045  avi->non_interleaved = 0;
1046  if (i == s->nb_streams && avi->non_interleaved) {
1048  "Non-interleaved AVI without index, switching to interleaved\n");
1049  avi->non_interleaved = 0;
1050  }
1051 
1052  if (avi->non_interleaved) {
1053  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1054  clean_index(s);
1055  }
1056 
1057  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1059 
1060  return 0;
1061 }
1062 
1064 {
1065  if (pkt->size >= 7 &&
1066  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1067  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1068  uint8_t desc[256];
1069  int score = AVPROBE_SCORE_EXTENSION, ret;
1070  AVIStream *ast = st->priv_data;
1071  AVInputFormat *sub_demuxer;
1072  AVRational time_base;
1073  int size;
1074  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1075  pkt->size - 7,
1076  0, NULL, NULL, NULL, NULL);
1077  AVProbeData pd;
1078  unsigned int desc_len = avio_rl32(pb);
1079 
1080  if (desc_len > pb->buf_end - pb->buf_ptr)
1081  goto error;
1082 
1083  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1084  avio_skip(pb, desc_len - ret);
1085  if (*desc)
1086  av_dict_set(&st->metadata, "title", desc, 0);
1087 
1088  avio_rl16(pb); /* flags? */
1089  avio_rl32(pb); /* data size */
1090 
1091  size = pb->buf_end - pb->buf_ptr;
1092  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1093  .buf_size = size };
1094  if (!pd.buf)
1095  goto error;
1096  memcpy(pd.buf, pb->buf_ptr, size);
1097  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1098  av_freep(&pd.buf);
1099  if (!sub_demuxer)
1100  goto error;
1101 
1102  if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1103  goto error;
1104 
1105  if (!(ast->sub_ctx = avformat_alloc_context()))
1106  goto error;
1107 
1108  ast->sub_ctx->pb = pb;
1109 
1110  if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1111  goto error;
1112 
1113  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1114  if (ast->sub_ctx->nb_streams != 1)
1115  goto error;
1116  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1118  time_base = ast->sub_ctx->streams[0]->time_base;
1119  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1120  }
1121  ast->sub_buffer = pkt->data;
1122  memset(pkt, 0, sizeof(*pkt));
1123  return 1;
1124 
1125 error:
1126  av_freep(&ast->sub_ctx);
1127  avio_context_free(&pb);
1128  }
1129  return 0;
1130 }
1131 
1133  AVPacket *pkt)
1134 {
1135  AVIStream *ast, *next_ast = next_st->priv_data;
1136  int64_t ts, next_ts, ts_min = INT64_MAX;
1137  AVStream *st, *sub_st = NULL;
1138  int i;
1139 
1140  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1141  AV_TIME_BASE_Q);
1142 
1143  for (i = 0; i < s->nb_streams; i++) {
1144  st = s->streams[i];
1145  ast = st->priv_data;
1146  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1147  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1148  if (ts <= next_ts && ts < ts_min) {
1149  ts_min = ts;
1150  sub_st = st;
1151  }
1152  }
1153  }
1154 
1155  if (sub_st) {
1156  ast = sub_st->priv_data;
1157  *pkt = ast->sub_pkt;
1158  pkt->stream_index = sub_st->index;
1159 
1160  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1161  ast->sub_pkt.data = NULL;
1162  }
1163  return sub_st;
1164 }
1165 
1166 static int get_stream_idx(const unsigned *d)
1167 {
1168  if (d[0] >= '0' && d[0] <= '9' &&
1169  d[1] >= '0' && d[1] <= '9') {
1170  return (d[0] - '0') * 10 + (d[1] - '0');
1171  } else {
1172  return 100; // invalid stream ID
1173  }
1174 }
1175 
1176 /**
1177  *
1178  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1179  */
1180 static int avi_sync(AVFormatContext *s, int exit_early)
1181 {
1182  AVIContext *avi = s->priv_data;
1183  AVIOContext *pb = s->pb;
1184  int n;
1185  unsigned int d[8];
1186  unsigned int size;
1187  int64_t i, sync;
1188 
1189 start_sync:
1190  memset(d, -1, sizeof(d));
1191  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1192  int j;
1193 
1194  for (j = 0; j < 7; j++)
1195  d[j] = d[j + 1];
1196  d[7] = avio_r8(pb);
1197 
1198  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1199 
1200  n = get_stream_idx(d + 2);
1201  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1202  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1203  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1204  continue;
1205 
1206  // parse ix##
1207  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1208  // parse JUNK
1209  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1210  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1211  (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1212  avio_skip(pb, size);
1213  goto start_sync;
1214  }
1215 
1216  // parse stray LIST
1217  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1218  avio_skip(pb, 4);
1219  goto start_sync;
1220  }
1221 
1222  n = get_stream_idx(d);
1223 
1224  if (!((i - avi->last_pkt_pos) & 1) &&
1225  get_stream_idx(d + 1) < s->nb_streams)
1226  continue;
1227 
1228  // detect ##ix chunk and skip
1229  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1230  avio_skip(pb, size);
1231  goto start_sync;
1232  }
1233 
1234  if (avi->dv_demux && n != 0)
1235  continue;
1236 
1237  // parse ##dc/##wb
1238  if (n < s->nb_streams) {
1239  AVStream *st;
1240  AVIStream *ast;
1241  st = s->streams[n];
1242  ast = st->priv_data;
1243 
1244  if (!ast) {
1245  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1246  continue;
1247  }
1248 
1249  if (s->nb_streams >= 2) {
1250  AVStream *st1 = s->streams[1];
1251  AVIStream *ast1 = st1->priv_data;
1252  // workaround for broken small-file-bug402.avi
1253  if ( d[2] == 'w' && d[3] == 'b'
1254  && n == 0
1255  && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1257  && ast->prefix == 'd'*256+'c'
1258  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1259  ) {
1260  n = 1;
1261  st = st1;
1262  ast = ast1;
1264  "Invalid stream + prefix combination, assuming audio.\n");
1265  }
1266  }
1267 
1268  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1269  int k = avio_r8(pb);
1270  int last = (k + avio_r8(pb) - 1) & 0xFF;
1271 
1272  avio_rl16(pb); // flags
1273 
1274  // b + (g << 8) + (r << 16);
1275  for (; k <= last; k++)
1276  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1277 
1278  ast->has_pal = 1;
1279  goto start_sync;
1280  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1281  d[2] < 128 && d[3] < 128) ||
1282  d[2] * 256 + d[3] == ast->prefix /* ||
1283  (d[2] == 'd' && d[3] == 'c') ||
1284  (d[2] == 'w' && d[3] == 'b') */) {
1285  if (exit_early)
1286  return 0;
1287  if (d[2] * 256 + d[3] == ast->prefix)
1288  ast->prefix_count++;
1289  else {
1290  ast->prefix = d[2] * 256 + d[3];
1291  ast->prefix_count = 0;
1292  }
1293 
1294  if (!avi->dv_demux &&
1295  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1296  // FIXME: needs a little reordering
1297  (st->discard >= AVDISCARD_NONKEY &&
1298  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1299  || st->discard >= AVDISCARD_ALL)) {
1300 
1301  ast->frame_offset += get_duration(ast, size);
1302  avio_skip(pb, size);
1303  goto start_sync;
1304  }
1305 
1306  avi->stream_index = n;
1307  ast->packet_size = size + 8;
1308  ast->remaining = size;
1309 
1310  if (size) {
1311  uint64_t pos = avio_tell(pb) - 8;
1312  if (!st->index_entries || !st->nb_index_entries ||
1313  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1314  av_add_index_entry(st, pos, ast->frame_offset, size,
1315  0, AVINDEX_KEYFRAME);
1316  }
1317  }
1318  return 0;
1319  }
1320  }
1321  }
1322 
1323  if (pb->error)
1324  return pb->error;
1325  return AVERROR_EOF;
1326 }
1327 
1329 {
1330  AVIContext *avi = s->priv_data;
1331  int best_stream_index = 0;
1332  AVStream *best_st = NULL;
1333  AVIStream *best_ast;
1334  int64_t best_ts = INT64_MAX;
1335  int i;
1336 
1337  for (i = 0; i < s->nb_streams; i++) {
1338  AVStream *st = s->streams[i];
1339  AVIStream *ast = st->priv_data;
1340  int64_t ts = ast->frame_offset;
1341  int64_t last_ts;
1342 
1343  if (!st->nb_index_entries)
1344  continue;
1345 
1346  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1347  if (!ast->remaining && ts > last_ts)
1348  continue;
1349 
1350  ts = av_rescale_q(ts, st->time_base,
1351  (AVRational) { FFMAX(1, ast->sample_size),
1352  AV_TIME_BASE });
1353 
1354  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1355  st->time_base.num, st->time_base.den, ast->frame_offset);
1356  if (ts < best_ts) {
1357  best_ts = ts;
1358  best_st = st;
1359  best_stream_index = i;
1360  }
1361  }
1362  if (!best_st)
1363  return AVERROR_EOF;
1364 
1365  best_ast = best_st->priv_data;
1366  best_ts = best_ast->frame_offset;
1367  if (best_ast->remaining) {
1368  i = av_index_search_timestamp(best_st,
1369  best_ts,
1370  AVSEEK_FLAG_ANY |
1372  } else {
1373  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1374  if (i >= 0)
1375  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1376  }
1377 
1378  if (i >= 0) {
1379  int64_t pos = best_st->index_entries[i].pos;
1380  pos += best_ast->packet_size - best_ast->remaining;
1381  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1382  return AVERROR_EOF;
1383 
1384  av_assert0(best_ast->remaining <= best_ast->packet_size);
1385 
1386  avi->stream_index = best_stream_index;
1387  if (!best_ast->remaining)
1388  best_ast->packet_size =
1389  best_ast->remaining = best_st->index_entries[i].size;
1390  }
1391  else
1392  return AVERROR_EOF;
1393 
1394  return 0;
1395 }
1396 
1398 {
1399  AVIContext *avi = s->priv_data;
1400  AVIOContext *pb = s->pb;
1401  int err;
1402 
1403  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1404  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1405  if (size >= 0)
1406  return size;
1407  else
1408  goto resync;
1409  }
1410 
1411  if (avi->non_interleaved) {
1412  err = ni_prepare_read(s);
1413  if (err < 0)
1414  return err;
1415  }
1416 
1417 resync:
1418  if (avi->stream_index >= 0) {
1419  AVStream *st = s->streams[avi->stream_index];
1420  AVIStream *ast = st->priv_data;
1421  int size, err;
1422 
1423  if (get_subtitle_pkt(s, st, pkt))
1424  return 0;
1425 
1426  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1427  if (ast->sample_size <= 1)
1428  size = INT_MAX;
1429  else if (ast->sample_size < 32)
1430  // arbitrary multiplier to avoid tiny packets for raw PCM data
1431  size = 1024 * ast->sample_size;
1432  else
1433  size = ast->sample_size;
1434 
1435  if (size > ast->remaining)
1436  size = ast->remaining;
1437  avi->last_pkt_pos = avio_tell(pb);
1438  err = av_get_packet(pb, pkt, size);
1439  if (err < 0)
1440  return err;
1441  size = err;
1442 
1443  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1444  uint8_t *pal;
1445  pal = av_packet_new_side_data(pkt,
1447  AVPALETTE_SIZE);
1448  if (!pal) {
1449  av_log(s, AV_LOG_ERROR,
1450  "Failed to allocate data for palette\n");
1451  } else {
1452  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1453  ast->has_pal = 0;
1454  }
1455  }
1456 
1457  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1458  AVBufferRef *avbuf = pkt->buf;
1459  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1460  pkt->data, pkt->size, pkt->pos);
1461  pkt->buf = avbuf;
1462  pkt->flags |= AV_PKT_FLAG_KEY;
1463  if (size < 0)
1464  av_packet_unref(pkt);
1465  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1466  !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1467  ast->frame_offset++;
1468  avi->stream_index = -1;
1469  ast->remaining = 0;
1470  goto resync;
1471  } else {
1472  /* XXX: How to handle B-frames in AVI? */
1473  pkt->dts = ast->frame_offset;
1474 // pkt->dts += ast->start;
1475  if (ast->sample_size)
1476  pkt->dts /= ast->sample_size;
1477  pkt->stream_index = avi->stream_index;
1478 
1479  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1480  AVIndexEntry *e;
1481  int index;
1482 
1484  e = &st->index_entries[index];
1485 
1486  if (index >= 0 && e->timestamp == ast->frame_offset) {
1487  if (index == st->nb_index_entries-1) {
1488  int key=1;
1489  uint32_t state=-1;
1490  if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1491  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1492  while (ptr < end) {
1493  ptr = avpriv_find_start_code(ptr, end, &state);
1494  if (state == 0x1B6 && ptr < end) {
1495  key = !(*ptr & 0xC0);
1496  break;
1497  }
1498  }
1499  }
1500  if (!key)
1501  e->flags &= ~AVINDEX_KEYFRAME;
1502  }
1503  if (e->flags & AVINDEX_KEYFRAME)
1504  pkt->flags |= AV_PKT_FLAG_KEY;
1505  }
1506  } else {
1507  pkt->flags |= AV_PKT_FLAG_KEY;
1508  }
1509  ast->frame_offset += get_duration(ast, pkt->size);
1510  }
1511  ast->remaining -= err;
1512  if (!ast->remaining) {
1513  avi->stream_index = -1;
1514  ast->packet_size = 0;
1515  }
1516 
1517  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1518  av_packet_unref(pkt);
1519  goto resync;
1520  }
1521  ast->seek_pos= 0;
1522 
1523  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1524  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1525 
1526  if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1527  avi->non_interleaved= 1;
1528  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1529  }else if (avi->dts_max < dts)
1530  avi->dts_max = dts;
1531  }
1532 
1533  return 0;
1534  }
1535 
1536  if ((err = avi_sync(s, 0)) < 0)
1537  return err;
1538  goto resync;
1539 }
1540 
1541 /* XXX: We make the implicit supposition that the positions are sorted
1542  * for each stream. */
1544 {
1545  AVIContext *avi = s->priv_data;
1546  AVIOContext *pb = s->pb;
1547  int nb_index_entries, i;
1548  AVStream *st;
1549  AVIStream *ast;
1550  int64_t pos;
1551  unsigned int index, tag, flags, len, first_packet = 1;
1552  int64_t last_pos = -1;
1553  unsigned last_idx = -1;
1554  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1555  int anykey = 0;
1556 
1557  nb_index_entries = size / 16;
1558  if (nb_index_entries <= 0)
1559  return AVERROR_INVALIDDATA;
1560 
1561  idx1_pos = avio_tell(pb);
1562  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1563  if (avi_sync(s, 1) == 0)
1564  first_packet_pos = avio_tell(pb) - 8;
1565  avi->stream_index = -1;
1566  avio_seek(pb, idx1_pos, SEEK_SET);
1567 
1568  if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1569  first_packet_pos = 0;
1570  data_offset = avi->movi_list;
1571  }
1572 
1573  /* Read the entries and sort them in each stream component. */
1574  for (i = 0; i < nb_index_entries; i++) {
1575  if (avio_feof(pb))
1576  return -1;
1577 
1578  tag = avio_rl32(pb);
1579  flags = avio_rl32(pb);
1580  pos = avio_rl32(pb);
1581  len = avio_rl32(pb);
1582  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1583  i, tag, flags, pos, len);
1584 
1585  index = ((tag & 0xff) - '0') * 10;
1586  index += (tag >> 8 & 0xff) - '0';
1587  if (index >= s->nb_streams)
1588  continue;
1589  st = s->streams[index];
1590  ast = st->priv_data;
1591 
1592  /* Skip 'xxpc' palette change entries in the index until a logic
1593  * to process these is properly implemented. */
1594  if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1595  continue;
1596 
1597  if (first_packet && first_packet_pos) {
1598  if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1599  data_offset = first_packet_pos - pos;
1600  first_packet = 0;
1601  }
1602  pos += data_offset;
1603 
1604  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1605 
1606  // even if we have only a single stream, we should
1607  // switch to non-interleaved to get correct timestamps
1608  if (last_pos == pos)
1609  avi->non_interleaved = 1;
1610  if (last_idx != pos && len) {
1611  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1612  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1613  last_idx= pos;
1614  }
1615  ast->cum_len += get_duration(ast, len);
1616  last_pos = pos;
1617  anykey |= flags&AVIIF_INDEX;
1618  }
1619  if (!anykey) {
1620  for (index = 0; index < s->nb_streams; index++) {
1621  st = s->streams[index];
1622  if (st->nb_index_entries)
1624  }
1625  }
1626  return 0;
1627 }
1628 
1629 /* Scan the index and consider any file with streams more than
1630  * 2 seconds or 64MB apart non-interleaved. */
1632 {
1633  int64_t min_pos, pos;
1634  int i;
1635  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1636  if (!idx)
1637  return AVERROR(ENOMEM);
1638  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1639  int64_t max_dts = INT64_MIN / 2;
1640  int64_t min_dts = INT64_MAX / 2;
1641  int64_t max_buffer = 0;
1642 
1643  min_pos = INT64_MAX;
1644 
1645  for (i = 0; i < s->nb_streams; i++) {
1646  AVStream *st = s->streams[i];
1647  AVIStream *ast = st->priv_data;
1648  int n = st->nb_index_entries;
1649  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1650  idx[i]++;
1651  if (idx[i] < n) {
1652  int64_t dts;
1653  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1654  FFMAX(ast->sample_size, 1),
1655  st->time_base, AV_TIME_BASE_Q);
1656  min_dts = FFMIN(min_dts, dts);
1657  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1658  }
1659  }
1660  for (i = 0; i < s->nb_streams; i++) {
1661  AVStream *st = s->streams[i];
1662  AVIStream *ast = st->priv_data;
1663 
1664  if (idx[i] && min_dts != INT64_MAX / 2) {
1665  int64_t dts;
1666  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1667  FFMAX(ast->sample_size, 1),
1668  st->time_base, AV_TIME_BASE_Q);
1669  max_dts = FFMAX(max_dts, dts);
1670  max_buffer = FFMAX(max_buffer,
1671  av_rescale(dts - min_dts,
1672  st->codecpar->bit_rate,
1673  AV_TIME_BASE));
1674  }
1675  }
1676  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1677  max_buffer > 1024 * 1024 * 8 * 8) {
1678  av_free(idx);
1679  return 1;
1680  }
1681  }
1682  av_free(idx);
1683  return 0;
1684 }
1685 
1687 {
1688  int i;
1689  int64_t last_start = 0;
1690  int64_t first_end = INT64_MAX;
1691  int64_t oldpos = avio_tell(s->pb);
1692 
1693  for (i = 0; i < s->nb_streams; i++) {
1694  AVStream *st = s->streams[i];
1695  int n = st->nb_index_entries;
1696  unsigned int size;
1697 
1698  if (n <= 0)
1699  continue;
1700 
1701  if (n >= 2) {
1702  int64_t pos = st->index_entries[0].pos;
1703  unsigned tag[2];
1704  avio_seek(s->pb, pos, SEEK_SET);
1705  tag[0] = avio_r8(s->pb);
1706  tag[1] = avio_r8(s->pb);
1707  avio_rl16(s->pb);
1708  size = avio_rl32(s->pb);
1709  if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1710  last_start = INT64_MAX;
1711  if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1712  last_start = INT64_MAX;
1713  }
1714 
1715  if (st->index_entries[0].pos > last_start)
1716  last_start = st->index_entries[0].pos;
1717  if (st->index_entries[n - 1].pos < first_end)
1718  first_end = st->index_entries[n - 1].pos;
1719  }
1720  avio_seek(s->pb, oldpos, SEEK_SET);
1721 
1722  if (last_start > first_end)
1723  return 1;
1724 
1725  return check_stream_max_drift(s);
1726 }
1727 
1729 {
1730  AVIContext *avi = s->priv_data;
1731  AVIOContext *pb = s->pb;
1732  uint32_t tag, size;
1733  int64_t pos = avio_tell(pb);
1734  int64_t next;
1735  int ret = -1;
1736 
1737  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1738  goto the_end; // maybe truncated file
1739  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1740  for (;;) {
1741  tag = avio_rl32(pb);
1742  size = avio_rl32(pb);
1743  if (avio_feof(pb))
1744  break;
1745  next = avio_tell(pb) + size + (size & 1);
1746 
1747  if (tag == MKTAG('i', 'd', 'x', '1') &&
1748  avi_read_idx1(s, size) >= 0) {
1749  avi->index_loaded=2;
1750  ret = 0;
1751  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1752  uint32_t tag1 = avio_rl32(pb);
1753 
1754  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1755  ff_read_riff_info(s, size - 4);
1756  }else if (!ret)
1757  break;
1758 
1759  if (avio_seek(pb, next, SEEK_SET) < 0)
1760  break; // something is wrong here
1761  }
1762 
1763 the_end:
1764  avio_seek(pb, pos, SEEK_SET);
1765  return ret;
1766 }
1767 
1768 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1769 {
1770  AVIStream *ast2 = st2->priv_data;
1771  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1772  av_packet_unref(&ast2->sub_pkt);
1773  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1774  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1775  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1776 }
1777 
1778 static int avi_read_seek(AVFormatContext *s, int stream_index,
1779  int64_t timestamp, int flags)
1780 {
1781  AVIContext *avi = s->priv_data;
1782  AVStream *st;
1783  int i, index;
1784  int64_t pos, pos_min;
1785  AVIStream *ast;
1786 
1787  /* Does not matter which stream is requested dv in avi has the
1788  * stream information in the first video stream.
1789  */
1790  if (avi->dv_demux)
1791  stream_index = 0;
1792 
1793  if (!avi->index_loaded) {
1794  /* we only load the index on demand */
1795  avi_load_index(s);
1796  avi->index_loaded |= 1;
1797  }
1798  av_assert0(stream_index >= 0);
1799 
1800  st = s->streams[stream_index];
1801  ast = st->priv_data;
1802  index = av_index_search_timestamp(st,
1803  timestamp * FFMAX(ast->sample_size, 1),
1804  flags);
1805  if (index < 0) {
1806  if (st->nb_index_entries > 0)
1807  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1808  timestamp * FFMAX(ast->sample_size, 1),
1809  st->index_entries[0].timestamp,
1811  return AVERROR_INVALIDDATA;
1812  }
1813 
1814  /* find the position */
1815  pos = st->index_entries[index].pos;
1816  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1817 
1818  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1819  timestamp, index, st->index_entries[index].timestamp);
1820 
1821  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1822  /* One and only one real stream for DV in AVI, and it has video */
1823  /* offsets. Calling with other stream indexes should have failed */
1824  /* the av_index_search_timestamp call above. */
1825 
1826  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1827  return -1;
1828 
1829  /* Feed the DV video stream version of the timestamp to the */
1830  /* DV demux so it can synthesize correct timestamps. */
1831  ff_dv_offset_reset(avi->dv_demux, timestamp);
1832 
1833  avi->stream_index = -1;
1834  return 0;
1835  }
1836 
1837  pos_min = pos;
1838  for (i = 0; i < s->nb_streams; i++) {
1839  AVStream *st2 = s->streams[i];
1840  AVIStream *ast2 = st2->priv_data;
1841 
1842  ast2->packet_size =
1843  ast2->remaining = 0;
1844 
1845  if (ast2->sub_ctx) {
1846  seek_subtitle(st, st2, timestamp);
1847  continue;
1848  }
1849 
1850  if (st2->nb_index_entries <= 0)
1851  continue;
1852 
1853 // av_assert1(st2->codecpar->block_align);
1854  index = av_index_search_timestamp(st2,
1855  av_rescale_q(timestamp,
1856  st->time_base,
1857  st2->time_base) *
1858  FFMAX(ast2->sample_size, 1),
1859  flags |
1862  if (index < 0)
1863  index = 0;
1864  ast2->seek_pos = st2->index_entries[index].pos;
1865  pos_min = FFMIN(pos_min,ast2->seek_pos);
1866  }
1867  for (i = 0; i < s->nb_streams; i++) {
1868  AVStream *st2 = s->streams[i];
1869  AVIStream *ast2 = st2->priv_data;
1870 
1871  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1872  continue;
1873 
1874  index = av_index_search_timestamp(
1875  st2,
1876  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1878  if (index < 0)
1879  index = 0;
1880  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1881  index--;
1882  ast2->frame_offset = st2->index_entries[index].timestamp;
1883  }
1884 
1885  /* do the seek */
1886  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1887  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1888  return -1;
1889  }
1890  avi->stream_index = -1;
1891  avi->dts_max = INT_MIN;
1892  return 0;
1893 }
1894 
1896 {
1897  int i;
1898  AVIContext *avi = s->priv_data;
1899 
1900  for (i = 0; i < s->nb_streams; i++) {
1901  AVStream *st = s->streams[i];
1902  AVIStream *ast = st->priv_data;
1903  if (ast) {
1904  if (ast->sub_ctx) {
1905  av_freep(&ast->sub_ctx->pb);
1907  }
1908  av_freep(&ast->sub_buffer);
1909  av_packet_unref(&ast->sub_pkt);
1910  }
1911  }
1912 
1913  av_freep(&avi->dv_demux);
1914 
1915  return 0;
1916 }
1917 
1918 static int avi_probe(AVProbeData *p)
1919 {
1920  int i;
1921 
1922  /* check file header */
1923  for (i = 0; avi_headers[i][0]; i++)
1924  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1925  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1926  return AVPROBE_SCORE_MAX;
1927 
1928  return 0;
1929 }
1930 
1932  .name = "avi",
1933  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1934  .priv_data_size = sizeof(AVIContext),
1935  .extensions = "avi",
1936  .read_probe = avi_probe,
1941  .priv_class = &demuxer_class,
1942 };
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:1132
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2423
#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:812
uint32_t handler
Definition: avidec.c:48
const char * s
Definition: avisynth_c.h:768
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:57
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
AVOption.
Definition: opt.h:246
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1982
static struct @260 state
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3052
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:86
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:1699
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:4741
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:145
const char * desc
Definition: nvenc.c:60
int64_t pos
Definition: avformat.h:820
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2425
int64_t last_pkt_pos
Definition: avidec.c:76
uint32_t rate
Definition: avidec.c:50
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4152
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:959
int dshow_block_align
Definition: avidec.c:59
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:890
int size
Definition: avcodec.h:1680
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:244
#define AVPROBE_PADDING_SIZE
extra allocated bytes at the end of the probe buffer
Definition: avformat.h:475
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1092
int is_odml
Definition: avidec.c:78
enum AVMediaType codec_type
Definition: rtp.c:37
int64_t movi_end
Definition: avidec.c:72
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
uint32_t scale
Definition: avidec.c:49
static int get_duration(AVIStream *ast, int len)
Definition: avidec.c:124
void * priv_data
Definition: avformat.h:904
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
#define AVIIF_INDEX
Definition: avi.h:38
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
discard all
Definition: avcodec.h:830
static AVPacket pkt
static int ni_prepare_read(AVFormatContext *s)
Definition: avidec.c:1328
EXIF metadata parser.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a UTF-16 string from pb and convert it to UTF-8.
static int check_stream_max_drift(AVFormatContext *s)
Definition: avidec.c:1631
static const AVMetadataConv avi_metadata_conv[]
Definition: avidec.c:112
Format I/O context.
Definition: avformat.h:1349
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:1462
Public dictionary API.
int stream_index
Definition: avidec.c:80
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
static int nb_streams
Definition: ffprobe.c:276
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:203
int width
Video only.
Definition: avcodec.h:4218
AVOptions.
static int avi_read_close(AVFormatContext *s)
Definition: avidec.c:1895
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:790
#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:1081
int id
Format-specific stream ID.
Definition: avformat.h:896
int64_t movi_list
Definition: avidec.c:75
static void handler(vbi_event *ev, void *user_data)
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4371
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
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
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:1460
DVDemuxContext * avpriv_dv_init_demux(AVFormatContext *s)
Definition: dv.c:324
uint8_t * data
Definition: avcodec.h:1679
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
Definition: avidec.c:1063
static int flags
Definition: log.c:57
uint32_t tag
Definition: movenc.c:1409
#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:289
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:556
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:637
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:4181
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1711
int packet_size
Definition: avidec.c:46
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#define U(x)
Definition: vp56_arith.h:37
#define AVIF_MUSTUSEINDEX
Definition: avi.h:25
#define AVINDEX_KEYFRAME
Definition: avformat.h:827
AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Allocate and initialize an AVIOContext for buffered I/O.
Definition: aviobuf.c:129
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2279
#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:1567
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: avcodec.h:1411
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2091
av_default_item_name
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
int remaining
Definition: avidec.c:45
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:821
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
#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:557
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4148
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1662
int avpriv_exif_decode_ifd(void *logctx, GetByteContext *gbytes, int le, int depth, AVDictionary **metadata)
Recursively decodes all IFD's and adds included TAGS into the metadata dictionary.
Definition: exif.c:122
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
Definition: avidec.c: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:1166
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:970
#define FFMAX(a, b)
Definition: common.h:94
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:249
#define fail()
Definition: checkasm.h:109
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1685
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:4170
Only parse headers, do not repack.
Definition: avformat.h:811
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:628
struct AVStream::@197 * info
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1405
int prefix_count
Definition: avidec.c:56
int non_interleaved
Definition: avidec.c:79
int block_align
Audio only.
Definition: avcodec.h:4269
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:261
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's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int64_t cum_len
Definition: avidec.c:54
static int avi_read_header(AVFormatContext *s)
Definition: avidec.c:466
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static const char months[12][4]
Definition: avidec.c:319
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
Definition: avidec.c:1768
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:1479
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:3061
int n
Definition: avisynth_c.h:684
AVDictionary * metadata
Definition: avformat.h:961
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:219
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:793
static int calculate_bitrate(AVFormatContext *s)
Definition: avidec.c:422
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:528
Stream structure.
Definition: avformat.h:889
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static const char avi_headers[][8]
Definition: avidec.c:103
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avidec.c:1397
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:1241
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:1391
static int resync(AVFormatContext *s)
Definition: flvdec.c:898
int index_loaded
Definition: avidec.c:77
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:618
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: avformat.h:1032
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:1094
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:1543
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:825
#define snprintf
Definition: snprintf.h:34
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:471
static int avi_probe(AVProbeData *p)
Definition: avidec.c:1918
int error
contains the error code or 0 if no error happened
Definition: avio.h:246
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Seek to timestamp ts.
Definition: utils.c:2472
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:553
int64_t seek_pos
Definition: avidec.c:66
static int avi_load_index(AVFormatContext *s)
Definition: avidec.c:1728
AVInputFormat ff_avi_demuxer
Definition: avidec.c:1931
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:946
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
int64_t io_fsize
Definition: avidec.c:74
A reference to a data buffer.
Definition: buffer.h:81
static const AVClass demuxer_class
Definition: avidec.c:94
full parsing and repack
Definition: avformat.h:810
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:743
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:83
common internal api header.
AVPacket sub_pkt
Definition: avidec.c:63
if(ret< 0)
Definition: vf_mcdeint.c:279
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:936
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1594
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:146
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:3236
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:948
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:4343
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:777
#define av_free(p)
char * value
Definition: dict.h:87
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
int len
int has_pal
Definition: avidec.c:58
static int guess_ni_flag(AVFormatContext *s)
Definition: avidec.c:1686
void * priv_data
Format private data.
Definition: avformat.h:1377
#define print_tag(str, tag, size)
Definition: avidec.c:120
int64_t frame_offset
Definition: avidec.c:43
int64_t dts_max
Definition: avidec.c:85
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:510
int64_t fsize
Definition: avidec.c:73
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4194
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:4166
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:178
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1678
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: avidec.c:1778
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1444
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
AVCodecParameters * codecpar
Definition: avformat.h:1252
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:356
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:4156
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:1681
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:926
static int read_odml_index(AVFormatContext *s, int frame_num)
Definition: avidec.c:159
#define MKTAG(a, b, c, d)
Definition: common.h:342
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:952
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:1127
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1656
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:767
static int avi_sync(AVFormatContext *s, int exit_early)
Definition: avidec.c:1180
GLuint buffer
Definition: opengl_enc.c:102
#define AV_WL32(p, v)
Definition: intreadwrite.h:431
const char * name
Definition: opengl_enc.c:103
uint8_t * sub_buffer
Definition: avidec.c:64
DVDemuxContext * dv_demux
Definition: avidec.c:81