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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_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
91  { NULL },
92 };
93 
94 static const AVClass demuxer_class = {
95  .class_name = "avi",
96  .item_name = av_default_item_name,
97  .option = options,
98  .version = LIBAVUTIL_VERSION_INT,
99  .category = AV_CLASS_CATEGORY_DEMUXER,
100 };
101 
102 
103 static const char avi_headers[][8] = {
104  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
105  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
106  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
107  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
108  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
109  { 0 }
110 };
111 
113  { "strn", "title" },
114  { 0 },
115 };
116 
117 static int avi_load_index(AVFormatContext *s);
118 static int guess_ni_flag(AVFormatContext *s);
119 
120 #define print_tag(str, tag, size) \
121  av_log(NULL, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
122  avio_tell(pb), str, tag & 0xff, \
123  (tag >> 8) & 0xff, \
124  (tag >> 16) & 0xff, \
125  (tag >> 24) & 0xff, \
126  size)
127 
128 static inline int get_duration(AVIStream *ast, int len)
129 {
130  if (ast->sample_size)
131  return len;
132  else if (ast->dshow_block_align > 1)
133  return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
134  else
135  return 1;
136 }
137 
139 {
140  AVIContext *avi = s->priv_data;
141  char header[8] = {0};
142  int i;
143 
144  /* check RIFF header */
145  avio_read(pb, header, 4);
146  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
147  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
148  avio_read(pb, header + 4, 4);
149 
150  for (i = 0; avi_headers[i][0]; i++)
151  if (!memcmp(header, avi_headers[i], 8))
152  break;
153  if (!avi_headers[i][0])
154  return AVERROR_INVALIDDATA;
155 
156  if (header[7] == 0x19)
157  av_log(s, AV_LOG_INFO,
158  "This file has been generated by a totally broken muxer.\n");
159 
160  return 0;
161 }
162 
163 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
164 {
165  AVIContext *avi = s->priv_data;
166  AVIOContext *pb = s->pb;
167  int longs_pre_entry = avio_rl16(pb);
168  int index_sub_type = avio_r8(pb);
169  int index_type = avio_r8(pb);
170  int entries_in_use = avio_rl32(pb);
171  int chunk_id = avio_rl32(pb);
172  int64_t base = avio_rl64(pb);
173  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
174  ((chunk_id >> 8 & 0xFF) - '0');
175  AVStream *st;
176  AVIStream *ast;
177  int i;
178  int64_t last_pos = -1;
179  int64_t filesize = avi->fsize;
180 
181  av_log(s, AV_LOG_TRACE,
182  "longs_pre_entry:%d index_type:%d entries_in_use:%d "
183  "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
184  longs_pre_entry,
185  index_type,
186  entries_in_use,
187  chunk_id,
188  base,
189  frame_num);
190 
191  if (stream_id >= s->nb_streams || stream_id < 0)
192  return AVERROR_INVALIDDATA;
193  st = s->streams[stream_id];
194  ast = st->priv_data;
195 
196  if (index_sub_type)
197  return AVERROR_INVALIDDATA;
198 
199  avio_rl32(pb);
200 
201  if (index_type && longs_pre_entry != 2)
202  return AVERROR_INVALIDDATA;
203  if (index_type > 1)
204  return AVERROR_INVALIDDATA;
205 
206  if (filesize > 0 && base >= filesize) {
207  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
208  if (base >> 32 == (base & 0xFFFFFFFF) &&
209  (base & 0xFFFFFFFF) < filesize &&
210  filesize <= 0xFFFFFFFF)
211  base &= 0xFFFFFFFF;
212  else
213  return AVERROR_INVALIDDATA;
214  }
215 
216  for (i = 0; i < entries_in_use; i++) {
217  if (index_type) {
218  int64_t pos = avio_rl32(pb) + base - 8;
219  int len = avio_rl32(pb);
220  int key = len >= 0;
221  len &= 0x7FFFFFFF;
222 
223  av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
224 
225  if (avio_feof(pb))
226  return AVERROR_INVALIDDATA;
227 
228  if (last_pos == pos || pos == base - 8)
229  avi->non_interleaved = 1;
230  if (last_pos != pos && len)
231  av_add_index_entry(st, pos, ast->cum_len, len, 0,
232  key ? AVINDEX_KEYFRAME : 0);
233 
234  ast->cum_len += get_duration(ast, len);
235  last_pos = pos;
236  } else {
237  int64_t offset, pos;
238  int duration;
239  offset = avio_rl64(pb);
240  avio_rl32(pb); /* size */
241  duration = avio_rl32(pb);
242 
243  if (avio_feof(pb))
244  return AVERROR_INVALIDDATA;
245 
246  pos = avio_tell(pb);
247 
248  if (avi->odml_depth > MAX_ODML_DEPTH) {
249  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
250  return AVERROR_INVALIDDATA;
251  }
252 
253  if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
254  return -1;
255  avi->odml_depth++;
256  read_braindead_odml_indx(s, frame_num);
257  avi->odml_depth--;
258  frame_num += duration;
259 
260  if (avio_seek(pb, pos, SEEK_SET) < 0) {
261  av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
262  return -1;
263  }
264 
265  }
266  }
267  avi->index_loaded = 2;
268  return 0;
269 }
270 
272 {
273  int i;
274  int64_t j;
275 
276  for (i = 0; i < s->nb_streams; i++) {
277  AVStream *st = s->streams[i];
278  AVIStream *ast = st->priv_data;
279  int n = st->nb_index_entries;
280  int max = ast->sample_size;
281  int64_t pos, size, ts;
282 
283  if (n != 1 || ast->sample_size == 0)
284  continue;
285 
286  while (max < 1024)
287  max += max;
288 
289  pos = st->index_entries[0].pos;
290  size = st->index_entries[0].size;
291  ts = st->index_entries[0].timestamp;
292 
293  for (j = 0; j < size; j += max)
294  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
296  }
297 }
298 
299 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
300  uint32_t size)
301 {
302  AVIOContext *pb = s->pb;
303  char key[5] = { 0 };
304  char *value;
305 
306  size += (size & 1);
307 
308  if (size == UINT_MAX)
309  return AVERROR(EINVAL);
310  value = av_malloc(size + 1);
311  if (!value)
312  return AVERROR(ENOMEM);
313  if (avio_read(pb, value, size) != size)
314  return AVERROR_INVALIDDATA;
315  value[size] = 0;
316 
317  AV_WL32(key, tag);
318 
319  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
321 }
322 
323 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
324  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
325 
326 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
327 {
328  char month[4], time[9], buffer[64];
329  int i, day, year;
330  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
331  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
332  month, &day, time, &year) == 4) {
333  for (i = 0; i < 12; i++)
334  if (!av_strcasecmp(month, months[i])) {
335  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
336  year, i + 1, day, time);
337  av_dict_set(metadata, "creation_time", buffer, 0);
338  }
339  } else if (date[4] == '/' && date[7] == '/') {
340  date[4] = date[7] = '-';
341  av_dict_set(metadata, "creation_time", date, 0);
342  }
343 }
344 
345 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
346 {
347  while (avio_tell(s->pb) < end) {
348  uint32_t tag = avio_rl32(s->pb);
349  uint32_t size = avio_rl32(s->pb);
350  switch (tag) {
351  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
352  {
353  uint64_t tag_end = avio_tell(s->pb) + size;
354  while (avio_tell(s->pb) < tag_end) {
355  uint16_t tag = avio_rl16(s->pb);
356  uint16_t size = avio_rl16(s->pb);
357  const char *name = NULL;
358  char buffer[64] = { 0 };
359  size = FFMIN(size, tag_end - avio_tell(s->pb));
360  size -= avio_read(s->pb, buffer,
361  FFMIN(size, sizeof(buffer) - 1));
362  switch (tag) {
363  case 0x03:
364  name = "maker";
365  break;
366  case 0x04:
367  name = "model";
368  break;
369  case 0x13:
370  name = "creation_time";
371  if (buffer[4] == ':' && buffer[7] == ':')
372  buffer[4] = buffer[7] = '-';
373  break;
374  }
375  if (name)
376  av_dict_set(&s->metadata, name, buffer, 0);
377  avio_skip(s->pb, size);
378  }
379  break;
380  }
381  default:
382  avio_skip(s->pb, size);
383  break;
384  }
385  }
386 }
387 
389 {
390  GetByteContext gb;
391  uint8_t *data = st->codec->extradata;
392  int data_size = st->codec->extradata_size;
393  int tag, offset;
394 
395  if (!data || data_size < 8) {
396  return AVERROR_INVALIDDATA;
397  }
398 
399  bytestream2_init(&gb, data, data_size);
400 
401  tag = bytestream2_get_le32(&gb);
402 
403  switch (tag) {
404  case MKTAG('A', 'V', 'I', 'F'):
405  // skip 4 byte padding
406  bytestream2_skip(&gb, 4);
407  offset = bytestream2_tell(&gb);
408  bytestream2_init(&gb, data + offset, data_size - offset);
409 
410  // decode EXIF tags from IFD, AVI is always little-endian
411  return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
412  break;
413  case MKTAG('C', 'A', 'S', 'I'):
414  avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
415  break;
416  case MKTAG('Z', 'o', 'r', 'a'):
417  avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag);
418  break;
419  default:
420  break;
421  }
422 
423  return 0;
424 }
425 
427 {
428  AVIContext *avi = s->priv_data;
429  int i, j;
430  int64_t lensum = 0;
431  int64_t maxpos = 0;
432 
433  for (i = 0; i<s->nb_streams; i++) {
434  int64_t len = 0;
435  AVStream *st = s->streams[i];
436 
437  if (!st->nb_index_entries)
438  continue;
439 
440  for (j = 0; j < st->nb_index_entries; j++)
441  len += st->index_entries[j].size;
442  maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
443  lensum += len;
444  }
445  if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
446  return 0;
447  if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
448  return 0;
449 
450  for (i = 0; i<s->nb_streams; i++) {
451  int64_t len = 0;
452  AVStream *st = s->streams[i];
453  int64_t duration;
454  int64_t bitrate;
455 
456  for (j = 0; j < st->nb_index_entries; j++)
457  len += st->index_entries[j].size;
458 
459  if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
460  continue;
461  duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
462  bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
463  if (bitrate <= INT_MAX && bitrate > 0) {
464  st->codec->bit_rate = bitrate;
465  }
466  }
467  return 1;
468 }
469 
471 {
472  AVIContext *avi = s->priv_data;
473  AVIOContext *pb = s->pb;
474  unsigned int tag, tag1, handler;
475  int codec_type, stream_index, frame_period;
476  unsigned int size;
477  int i;
478  AVStream *st;
479  AVIStream *ast = NULL;
480  int avih_width = 0, avih_height = 0;
481  int amv_file_format = 0;
482  uint64_t list_end = 0;
483  int ret;
484  AVDictionaryEntry *dict_entry;
485 
486  avi->stream_index = -1;
487 
488  ret = get_riff(s, pb);
489  if (ret < 0)
490  return ret;
491 
492  av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
493 
494  avi->io_fsize = avi->fsize = avio_size(pb);
495  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
496  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
497 
498  /* first list tag */
499  stream_index = -1;
500  codec_type = -1;
501  frame_period = 0;
502  for (;;) {
503  if (avio_feof(pb))
504  goto fail;
505  tag = avio_rl32(pb);
506  size = avio_rl32(pb);
507 
508  print_tag("tag", tag, size);
509 
510  switch (tag) {
511  case MKTAG('L', 'I', 'S', 'T'):
512  list_end = avio_tell(pb) + size;
513  /* Ignored, except at start of video packets. */
514  tag1 = avio_rl32(pb);
515 
516  print_tag("list", tag1, 0);
517 
518  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
519  avi->movi_list = avio_tell(pb) - 4;
520  if (size)
521  avi->movi_end = avi->movi_list + size + (size & 1);
522  else
523  avi->movi_end = avi->fsize;
524  av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
525  goto end_of_header;
526  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
527  ff_read_riff_info(s, size - 4);
528  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
529  avi_read_nikon(s, list_end);
530 
531  break;
532  case MKTAG('I', 'D', 'I', 'T'):
533  {
534  unsigned char date[64] = { 0 };
535  size += (size & 1);
536  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
537  avio_skip(pb, size);
539  break;
540  }
541  case MKTAG('d', 'm', 'l', 'h'):
542  avi->is_odml = 1;
543  avio_skip(pb, size + (size & 1));
544  break;
545  case MKTAG('a', 'm', 'v', 'h'):
546  amv_file_format = 1;
547  case MKTAG('a', 'v', 'i', 'h'):
548  /* AVI header */
549  /* using frame_period is bad idea */
550  frame_period = avio_rl32(pb);
551  avio_rl32(pb); /* max. bytes per second */
552  avio_rl32(pb);
554 
555  avio_skip(pb, 2 * 4);
556  avio_rl32(pb);
557  avio_rl32(pb);
558  avih_width = avio_rl32(pb);
559  avih_height = avio_rl32(pb);
560 
561  avio_skip(pb, size - 10 * 4);
562  break;
563  case MKTAG('s', 't', 'r', 'h'):
564  /* stream header */
565 
566  tag1 = avio_rl32(pb);
567  handler = avio_rl32(pb); /* codec tag */
568 
569  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
570  avio_skip(pb, size - 8);
571  break;
572  } else {
573  stream_index++;
574  st = avformat_new_stream(s, NULL);
575  if (!st)
576  goto fail;
577 
578  st->id = stream_index;
579  ast = av_mallocz(sizeof(AVIStream));
580  if (!ast)
581  goto fail;
582  st->priv_data = ast;
583  }
584  if (amv_file_format)
585  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
586  : MKTAG('v', 'i', 'd', 's');
587 
588  print_tag("strh", tag1, -1);
589 
590  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
591  tag1 == MKTAG('i', 'v', 'a', 's')) {
592  int64_t dv_dur;
593 
594  /* After some consideration -- I don't think we
595  * have to support anything but DV in type1 AVIs. */
596  if (s->nb_streams != 1)
597  goto fail;
598 
599  if (handler != MKTAG('d', 'v', 's', 'd') &&
600  handler != MKTAG('d', 'v', 'h', 'd') &&
601  handler != MKTAG('d', 'v', 's', 'l'))
602  goto fail;
603 
604  ast = s->streams[0]->priv_data;
605  av_freep(&s->streams[0]->codec->extradata);
606  av_freep(&s->streams[0]->codec);
607  if (s->streams[0]->info)
609  av_freep(&s->streams[0]->info);
610  av_freep(&s->streams[0]);
611  s->nb_streams = 0;
612  if (CONFIG_DV_DEMUXER) {
613  avi->dv_demux = avpriv_dv_init_demux(s);
614  if (!avi->dv_demux)
615  goto fail;
616  } else
617  goto fail;
618  s->streams[0]->priv_data = ast;
619  avio_skip(pb, 3 * 4);
620  ast->scale = avio_rl32(pb);
621  ast->rate = avio_rl32(pb);
622  avio_skip(pb, 4); /* start time */
623 
624  dv_dur = avio_rl32(pb);
625  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
626  dv_dur *= AV_TIME_BASE;
627  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
628  }
629  /* else, leave duration alone; timing estimation in utils.c
630  * will make a guess based on bitrate. */
631 
632  stream_index = s->nb_streams - 1;
633  avio_skip(pb, size - 9 * 4);
634  break;
635  }
636 
637  av_assert0(stream_index < s->nb_streams);
638  ast->handler = handler;
639 
640  avio_rl32(pb); /* flags */
641  avio_rl16(pb); /* priority */
642  avio_rl16(pb); /* language */
643  avio_rl32(pb); /* initial frame */
644  ast->scale = avio_rl32(pb);
645  ast->rate = avio_rl32(pb);
646  if (!(ast->scale && ast->rate)) {
648  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
649  "(This file has been generated by broken software.)\n",
650  ast->scale,
651  ast->rate);
652  if (frame_period) {
653  ast->rate = 1000000;
654  ast->scale = frame_period;
655  } else {
656  ast->rate = 25;
657  ast->scale = 1;
658  }
659  }
660  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
661 
662  ast->cum_len = avio_rl32(pb); /* start */
663  st->nb_frames = avio_rl32(pb);
664 
665  st->start_time = 0;
666  avio_rl32(pb); /* buffer size */
667  avio_rl32(pb); /* quality */
668  if (ast->cum_len*ast->scale/ast->rate > 3600) {
669  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
670  ast->cum_len = 0;
671  }
672  ast->sample_size = avio_rl32(pb); /* sample ssize */
673  ast->cum_len *= FFMAX(1, ast->sample_size);
674  av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
675  ast->rate, ast->scale, ast->sample_size);
676 
677  switch (tag1) {
678  case MKTAG('v', 'i', 'd', 's'):
679  codec_type = AVMEDIA_TYPE_VIDEO;
680 
681  ast->sample_size = 0;
682  st->avg_frame_rate = av_inv_q(st->time_base);
683  break;
684  case MKTAG('a', 'u', 'd', 's'):
685  codec_type = AVMEDIA_TYPE_AUDIO;
686  break;
687  case MKTAG('t', 'x', 't', 's'):
688  codec_type = AVMEDIA_TYPE_SUBTITLE;
689  break;
690  case MKTAG('d', 'a', 't', 's'):
691  codec_type = AVMEDIA_TYPE_DATA;
692  break;
693  default:
694  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
695  }
696  if (ast->sample_size < 0)
697  av_log(s, AV_LOG_WARNING, "sample size %d is invalid\n", ast->sample_size);
698  ast->sample_size = FFMAX(ast->sample_size, 0);
699  if (ast->sample_size == 0) {
700  st->duration = st->nb_frames;
701  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
702  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
703  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
704  }
705  }
706  ast->frame_offset = ast->cum_len;
707  avio_skip(pb, size - 12 * 4);
708  break;
709  case MKTAG('s', 't', 'r', 'f'):
710  /* stream header */
711  if (!size)
712  break;
713  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
714  avio_skip(pb, size);
715  } else {
716  uint64_t cur_pos = avio_tell(pb);
717  unsigned esize;
718  if (cur_pos < list_end)
719  size = FFMIN(size, list_end - cur_pos);
720  st = s->streams[stream_index];
721  if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
722  avio_skip(pb, size);
723  break;
724  }
725  switch (codec_type) {
726  case AVMEDIA_TYPE_VIDEO:
727  if (amv_file_format) {
728  st->codec->width = avih_width;
729  st->codec->height = avih_height;
732  avio_skip(pb, size);
733  break;
734  }
735  tag1 = ff_get_bmp_header(pb, st, &esize);
736 
737  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
738  tag1 == MKTAG('D', 'X', 'S', 'A')) {
740  st->codec->codec_tag = tag1;
742  break;
743  }
744 
745  if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
746  if (esize == size-1 && (esize&1)) {
747  st->codec->extradata_size = esize - 10 * 4;
748  } else
749  st->codec->extradata_size = size - 10 * 4;
750  if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
751  return AVERROR(ENOMEM);
752  }
753 
754  // FIXME: check if the encoder really did this correctly
755  if (st->codec->extradata_size & 1)
756  avio_r8(pb);
757 
758  /* Extract palette from extradata if bpp <= 8.
759  * This code assumes that extradata contains only palette.
760  * This is true for all paletted codecs implemented in
761  * FFmpeg. */
762  if (st->codec->extradata_size &&
763  (st->codec->bits_per_coded_sample <= 8)) {
764  int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
765  const uint8_t *pal_src;
766 
767  pal_size = FFMIN(pal_size, st->codec->extradata_size);
768  pal_src = st->codec->extradata +
769  st->codec->extradata_size - pal_size;
770  /* Exclude the "BottomUp" field from the palette */
771  if (pal_src - st->codec->extradata >= 9 &&
772  !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
773  pal_src -= 9;
774  for (i = 0; i < pal_size / 4; i++)
775  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
776  ast->has_pal = 1;
777  }
778 
779  print_tag("video", tag1, 0);
780 
782  st->codec->codec_tag = tag1;
784  tag1);
785  /* If codec is not found yet, try with the mov tags. */
786  if (!st->codec->codec_id) {
787  char tag_buf[32];
788  av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1);
789  st->codec->codec_id =
791  if (st->codec->codec_id)
793  "mov tag found in avi (fourcc %s)\n",
794  tag_buf);
795  }
796  /* This is needed to get the pict type which is necessary
797  * for generating correct pts. */
799 
800  if (st->codec->codec_id == AV_CODEC_ID_MPEG4 &&
801  ast->handler == MKTAG('X', 'V', 'I', 'D'))
802  st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D');
803 
804  if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
806 
807  if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
808  st->codec->extradata_size < 1U << 30) {
809  st->codec->extradata_size += 9;
810  if ((ret = av_reallocp(&st->codec->extradata,
811  st->codec->extradata_size +
813  st->codec->extradata_size = 0;
814  return ret;
815  } else
816  memcpy(st->codec->extradata + st->codec->extradata_size - 9,
817  "BottomUp", 9);
818  }
819  st->codec->height = FFABS(st->codec->height);
820 
821 // avio_skip(pb, size - 5 * 4);
822  break;
823  case AVMEDIA_TYPE_AUDIO:
824  ret = ff_get_wav_header(pb, st->codec, size, 0);
825  if (ret < 0)
826  return ret;
827  ast->dshow_block_align = st->codec->block_align;
828  if (ast->sample_size && st->codec->block_align &&
829  ast->sample_size != st->codec->block_align) {
830  av_log(s,
832  "sample size (%d) != block align (%d)\n",
833  ast->sample_size,
834  st->codec->block_align);
835  ast->sample_size = st->codec->block_align;
836  }
837  /* 2-aligned
838  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
839  if (size & 1)
840  avio_skip(pb, 1);
841  /* Force parsing as several audio frames can be in
842  * one packet and timestamps refer to packet start. */
844  /* ADTS header is in extradata, AAC without header must be
845  * stored as exact frames. Parser not needed and it will
846  * fail. */
847  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
848  st->codec->extradata_size)
850  /* AVI files with Xan DPCM audio (wrongly) declare PCM
851  * audio in the header but have Axan as stream_code_tag. */
852  if (ast->handler == AV_RL32("Axan")) {
854  st->codec->codec_tag = 0;
855  ast->dshow_block_align = 0;
856  }
857  if (amv_file_format) {
859  ast->dshow_block_align = 0;
860  }
861  if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
862  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
863  ast->dshow_block_align = 0;
864  }
865  if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
866  st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
867  st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
868  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
869  ast->sample_size = 0;
870  }
871  break;
874  st->request_probe= 1;
875  avio_skip(pb, size);
876  break;
877  default:
880  st->codec->codec_tag = 0;
881  avio_skip(pb, size);
882  break;
883  }
884  }
885  break;
886  case MKTAG('s', 't', 'r', 'd'):
887  if (stream_index >= (unsigned)s->nb_streams
888  || s->streams[stream_index]->codec->extradata_size
889  || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
890  avio_skip(pb, size);
891  } else {
892  uint64_t cur_pos = avio_tell(pb);
893  if (cur_pos < list_end)
894  size = FFMIN(size, list_end - cur_pos);
895  st = s->streams[stream_index];
896 
897  if (size<(1<<30)) {
898  if (ff_get_extradata(st->codec, pb, size) < 0)
899  return AVERROR(ENOMEM);
900  }
901 
902  if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
903  avio_r8(pb);
904 
905  ret = avi_extract_stream_metadata(st);
906  if (ret < 0) {
907  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
908  }
909  }
910  break;
911  case MKTAG('i', 'n', 'd', 'x'):
912  i = avio_tell(pb);
913  if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
914  avi->use_odml &&
915  read_braindead_odml_indx(s, 0) < 0 &&
917  goto fail;
918  avio_seek(pb, i + size, SEEK_SET);
919  break;
920  case MKTAG('v', 'p', 'r', 'p'):
921  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
922  AVRational active, active_aspect;
923 
924  st = s->streams[stream_index];
925  avio_rl32(pb);
926  avio_rl32(pb);
927  avio_rl32(pb);
928  avio_rl32(pb);
929  avio_rl32(pb);
930 
931  active_aspect.den = avio_rl16(pb);
932  active_aspect.num = avio_rl16(pb);
933  active.num = avio_rl32(pb);
934  active.den = avio_rl32(pb);
935  avio_rl32(pb); // nbFieldsPerFrame
936 
937  if (active_aspect.num && active_aspect.den &&
938  active.num && active.den) {
939  st->sample_aspect_ratio = av_div_q(active_aspect, active);
940  av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
941  active_aspect.num, active_aspect.den,
942  active.num, active.den);
943  }
944  size -= 9 * 4;
945  }
946  avio_skip(pb, size);
947  break;
948  case MKTAG('s', 't', 'r', 'n'):
949  if (s->nb_streams) {
950  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
951  if (ret < 0)
952  return ret;
953  break;
954  }
955  default:
956  if (size > 1000000) {
957  av_log(s, AV_LOG_ERROR,
958  "Something went wrong during header parsing, "
959  "I will ignore it and try to continue anyway.\n");
961  goto fail;
962  avi->movi_list = avio_tell(pb) - 4;
963  avi->movi_end = avi->fsize;
964  goto end_of_header;
965  }
966  /* skip tag */
967  size += (size & 1);
968  avio_skip(pb, size);
969  break;
970  }
971  }
972 
973 end_of_header:
974  /* check stream number */
975  if (stream_index != s->nb_streams - 1) {
976 
977 fail:
978  return AVERROR_INVALIDDATA;
979  }
980 
981  if (!avi->index_loaded && pb->seekable)
982  avi_load_index(s);
984  avi->index_loaded |= 1;
985 
986  if ((ret = guess_ni_flag(s)) < 0)
987  return ret;
988 
989  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
990 
991  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
992  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
993  for (i = 0; i < s->nb_streams; i++) {
994  AVStream *st = s->streams[i];
998  }
999 
1000  for (i = 0; i < s->nb_streams; i++) {
1001  AVStream *st = s->streams[i];
1002  if (st->nb_index_entries)
1003  break;
1004  }
1005  // DV-in-AVI cannot be non-interleaved, if set this must be
1006  // a mis-detection.
1007  if (avi->dv_demux)
1008  avi->non_interleaved = 0;
1009  if (i == s->nb_streams && avi->non_interleaved) {
1011  "Non-interleaved AVI without index, switching to interleaved\n");
1012  avi->non_interleaved = 0;
1013  }
1014 
1015  if (avi->non_interleaved) {
1016  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1017  clean_index(s);
1018  }
1019 
1020  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1022 
1023  return 0;
1024 }
1025 
1027 {
1028  if (pkt->size >= 7 &&
1029  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1030  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1031  uint8_t desc[256];
1032  int score = AVPROBE_SCORE_EXTENSION, ret;
1033  AVIStream *ast = st->priv_data;
1034  AVInputFormat *sub_demuxer;
1035  AVRational time_base;
1036  int size;
1037  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1038  pkt->size - 7,
1039  0, NULL, NULL, NULL, NULL);
1040  AVProbeData pd;
1041  unsigned int desc_len = avio_rl32(pb);
1042 
1043  if (desc_len > pb->buf_end - pb->buf_ptr)
1044  goto error;
1045 
1046  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1047  avio_skip(pb, desc_len - ret);
1048  if (*desc)
1049  av_dict_set(&st->metadata, "title", desc, 0);
1050 
1051  avio_rl16(pb); /* flags? */
1052  avio_rl32(pb); /* data size */
1053 
1054  size = pb->buf_end - pb->buf_ptr;
1055  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1056  .buf_size = size };
1057  if (!pd.buf)
1058  goto error;
1059  memcpy(pd.buf, pb->buf_ptr, size);
1060  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1061  av_freep(&pd.buf);
1062  if (!sub_demuxer)
1063  goto error;
1064 
1065  if (!(ast->sub_ctx = avformat_alloc_context()))
1066  goto error;
1067 
1068  ast->sub_ctx->pb = pb;
1069 
1070  if (ff_copy_whitelists(ast->sub_ctx, s) < 0)
1071  goto error;
1072 
1073  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1074  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1075  *st->codec = *ast->sub_ctx->streams[0]->codec;
1076  ast->sub_ctx->streams[0]->codec->extradata = NULL;
1077  time_base = ast->sub_ctx->streams[0]->time_base;
1078  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1079  }
1080  ast->sub_buffer = pkt->data;
1081  memset(pkt, 0, sizeof(*pkt));
1082  return 1;
1083 
1084 error:
1085  av_freep(&ast->sub_ctx);
1086  av_freep(&pb);
1087  }
1088  return 0;
1089 }
1090 
1092  AVPacket *pkt)
1093 {
1094  AVIStream *ast, *next_ast = next_st->priv_data;
1095  int64_t ts, next_ts, ts_min = INT64_MAX;
1096  AVStream *st, *sub_st = NULL;
1097  int i;
1098 
1099  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1100  AV_TIME_BASE_Q);
1101 
1102  for (i = 0; i < s->nb_streams; i++) {
1103  st = s->streams[i];
1104  ast = st->priv_data;
1105  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1106  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1107  if (ts <= next_ts && ts < ts_min) {
1108  ts_min = ts;
1109  sub_st = st;
1110  }
1111  }
1112  }
1113 
1114  if (sub_st) {
1115  ast = sub_st->priv_data;
1116  *pkt = ast->sub_pkt;
1117  pkt->stream_index = sub_st->index;
1118 
1119  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1120  ast->sub_pkt.data = NULL;
1121  }
1122  return sub_st;
1123 }
1124 
1125 static int get_stream_idx(const unsigned *d)
1126 {
1127  if (d[0] >= '0' && d[0] <= '9' &&
1128  d[1] >= '0' && d[1] <= '9') {
1129  return (d[0] - '0') * 10 + (d[1] - '0');
1130  } else {
1131  return 100; // invalid stream ID
1132  }
1133 }
1134 
1135 /**
1136  *
1137  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1138  */
1139 static int avi_sync(AVFormatContext *s, int exit_early)
1140 {
1141  AVIContext *avi = s->priv_data;
1142  AVIOContext *pb = s->pb;
1143  int n;
1144  unsigned int d[8];
1145  unsigned int size;
1146  int64_t i, sync;
1147 
1148 start_sync:
1149  memset(d, -1, sizeof(d));
1150  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1151  int j;
1152 
1153  for (j = 0; j < 7; j++)
1154  d[j] = d[j + 1];
1155  d[7] = avio_r8(pb);
1156 
1157  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1158 
1159  n = get_stream_idx(d + 2);
1160  ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1161  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1162  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1163  continue;
1164 
1165  // parse ix##
1166  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1167  // parse JUNK
1168  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1169  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1170  avio_skip(pb, size);
1171  goto start_sync;
1172  }
1173 
1174  // parse stray LIST
1175  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1176  avio_skip(pb, 4);
1177  goto start_sync;
1178  }
1179 
1180  n = get_stream_idx(d);
1181 
1182  if (!((i - avi->last_pkt_pos) & 1) &&
1183  get_stream_idx(d + 1) < s->nb_streams)
1184  continue;
1185 
1186  // detect ##ix chunk and skip
1187  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1188  avio_skip(pb, size);
1189  goto start_sync;
1190  }
1191 
1192  if (avi->dv_demux && n != 0)
1193  continue;
1194 
1195  // parse ##dc/##wb
1196  if (n < s->nb_streams) {
1197  AVStream *st;
1198  AVIStream *ast;
1199  st = s->streams[n];
1200  ast = st->priv_data;
1201 
1202  if (!ast) {
1203  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1204  continue;
1205  }
1206 
1207  if (s->nb_streams >= 2) {
1208  AVStream *st1 = s->streams[1];
1209  AVIStream *ast1 = st1->priv_data;
1210  // workaround for broken small-file-bug402.avi
1211  if ( d[2] == 'w' && d[3] == 'b'
1212  && n == 0
1213  && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1214  && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1215  && ast->prefix == 'd'*256+'c'
1216  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1217  ) {
1218  n = 1;
1219  st = st1;
1220  ast = ast1;
1222  "Invalid stream + prefix combination, assuming audio.\n");
1223  }
1224  }
1225 
1226  if (!avi->dv_demux &&
1227  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1228  // FIXME: needs a little reordering
1229  (st->discard >= AVDISCARD_NONKEY &&
1230  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1231  || st->discard >= AVDISCARD_ALL)) {
1232  if (!exit_early) {
1233  ast->frame_offset += get_duration(ast, size);
1234  avio_skip(pb, size);
1235  goto start_sync;
1236  }
1237  }
1238 
1239  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1240  int k = avio_r8(pb);
1241  int last = (k + avio_r8(pb) - 1) & 0xFF;
1242 
1243  avio_rl16(pb); // flags
1244 
1245  // b + (g << 8) + (r << 16);
1246  for (; k <= last; k++)
1247  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1248 
1249  ast->has_pal = 1;
1250  goto start_sync;
1251  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1252  d[2] < 128 && d[3] < 128) ||
1253  d[2] * 256 + d[3] == ast->prefix /* ||
1254  (d[2] == 'd' && d[3] == 'c') ||
1255  (d[2] == 'w' && d[3] == 'b') */) {
1256  if (exit_early)
1257  return 0;
1258  if (d[2] * 256 + d[3] == ast->prefix)
1259  ast->prefix_count++;
1260  else {
1261  ast->prefix = d[2] * 256 + d[3];
1262  ast->prefix_count = 0;
1263  }
1264 
1265  avi->stream_index = n;
1266  ast->packet_size = size + 8;
1267  ast->remaining = size;
1268 
1269  if (size) {
1270  uint64_t pos = avio_tell(pb) - 8;
1271  if (!st->index_entries || !st->nb_index_entries ||
1272  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1273  av_add_index_entry(st, pos, ast->frame_offset, size,
1274  0, AVINDEX_KEYFRAME);
1275  }
1276  }
1277  return 0;
1278  }
1279  }
1280  }
1281 
1282  if (pb->error)
1283  return pb->error;
1284  return AVERROR_EOF;
1285 }
1286 
1288 {
1289  AVIContext *avi = s->priv_data;
1290  AVIOContext *pb = s->pb;
1291  int err;
1292 #if FF_API_DESTRUCT_PACKET
1293  void *dstr;
1294 #endif
1295 
1296  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1297  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1298  if (size >= 0)
1299  return size;
1300  else
1301  goto resync;
1302  }
1303 
1304  if (avi->non_interleaved) {
1305  int best_stream_index = 0;
1306  AVStream *best_st = NULL;
1307  AVIStream *best_ast;
1308  int64_t best_ts = INT64_MAX;
1309  int i;
1310 
1311  for (i = 0; i < s->nb_streams; i++) {
1312  AVStream *st = s->streams[i];
1313  AVIStream *ast = st->priv_data;
1314  int64_t ts = ast->frame_offset;
1315  int64_t last_ts;
1316 
1317  if (!st->nb_index_entries)
1318  continue;
1319 
1320  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1321  if (!ast->remaining && ts > last_ts)
1322  continue;
1323 
1324  ts = av_rescale_q(ts, st->time_base,
1325  (AVRational) { FFMAX(1, ast->sample_size),
1326  AV_TIME_BASE });
1327 
1328  av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1329  st->time_base.num, st->time_base.den, ast->frame_offset);
1330  if (ts < best_ts) {
1331  best_ts = ts;
1332  best_st = st;
1333  best_stream_index = i;
1334  }
1335  }
1336  if (!best_st)
1337  return AVERROR_EOF;
1338 
1339  best_ast = best_st->priv_data;
1340  best_ts = best_ast->frame_offset;
1341  if (best_ast->remaining) {
1342  i = av_index_search_timestamp(best_st,
1343  best_ts,
1344  AVSEEK_FLAG_ANY |
1346  } else {
1347  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1348  if (i >= 0)
1349  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1350  }
1351 
1352  if (i >= 0) {
1353  int64_t pos = best_st->index_entries[i].pos;
1354  pos += best_ast->packet_size - best_ast->remaining;
1355  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1356  return AVERROR_EOF;
1357 
1358  av_assert0(best_ast->remaining <= best_ast->packet_size);
1359 
1360  avi->stream_index = best_stream_index;
1361  if (!best_ast->remaining)
1362  best_ast->packet_size =
1363  best_ast->remaining = best_st->index_entries[i].size;
1364  }
1365  else
1366  return AVERROR_EOF;
1367  }
1368 
1369 resync:
1370  if (avi->stream_index >= 0) {
1371  AVStream *st = s->streams[avi->stream_index];
1372  AVIStream *ast = st->priv_data;
1373  int size, err;
1374 
1375  if (get_subtitle_pkt(s, st, pkt))
1376  return 0;
1377 
1378  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1379  if (ast->sample_size <= 1)
1380  size = INT_MAX;
1381  else if (ast->sample_size < 32)
1382  // arbitrary multiplier to avoid tiny packets for raw PCM data
1383  size = 1024 * ast->sample_size;
1384  else
1385  size = ast->sample_size;
1386 
1387  if (size > ast->remaining)
1388  size = ast->remaining;
1389  avi->last_pkt_pos = avio_tell(pb);
1390  err = av_get_packet(pb, pkt, size);
1391  if (err < 0)
1392  return err;
1393  size = err;
1394 
1395  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1396  uint8_t *pal;
1399  AVPALETTE_SIZE);
1400  if (!pal) {
1402  "Failed to allocate data for palette\n");
1403  } else {
1404  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1405  ast->has_pal = 0;
1406  }
1407  }
1408 
1409  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1410  AVBufferRef *avbuf = pkt->buf;
1411 #if FF_API_DESTRUCT_PACKET
1413  dstr = pkt->destruct;
1415 #endif
1416  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1417  pkt->data, pkt->size, pkt->pos);
1418 #if FF_API_DESTRUCT_PACKET
1420  pkt->destruct = dstr;
1422 #endif
1423  pkt->buf = avbuf;
1425  if (size < 0)
1427  } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1428  !st->codec->codec_tag && read_gab2_sub(s, st, pkt)) {
1429  ast->frame_offset++;
1430  avi->stream_index = -1;
1431  ast->remaining = 0;
1432  goto resync;
1433  } else {
1434  /* XXX: How to handle B-frames in AVI? */
1435  pkt->dts = ast->frame_offset;
1436 // pkt->dts += ast->start;
1437  if (ast->sample_size)
1438  pkt->dts /= ast->sample_size;
1440  "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1441  "base:%d st:%d size:%d\n",
1442  pkt->dts,
1443  ast->frame_offset,
1444  ast->scale,
1445  ast->rate,
1446  ast->sample_size,
1447  AV_TIME_BASE,
1448  avi->stream_index,
1449  size);
1450  pkt->stream_index = avi->stream_index;
1451 
1452  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1453  AVIndexEntry *e;
1454  int index;
1455 
1457  e = &st->index_entries[index];
1458 
1459  if (index >= 0 && e->timestamp == ast->frame_offset) {
1460  if (index == st->nb_index_entries-1) {
1461  int key=1;
1462  uint32_t state=-1;
1463  if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1464  const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1465  while (ptr < end) {
1466  ptr = avpriv_find_start_code(ptr, end, &state);
1467  if (state == 0x1B6 && ptr < end) {
1468  key = !(*ptr & 0xC0);
1469  break;
1470  }
1471  }
1472  }
1473  if (!key)
1474  e->flags &= ~AVINDEX_KEYFRAME;
1475  }
1476  if (e->flags & AVINDEX_KEYFRAME)
1478  }
1479  } else {
1481  }
1482  ast->frame_offset += get_duration(ast, pkt->size);
1483  }
1484  ast->remaining -= err;
1485  if (!ast->remaining) {
1486  avi->stream_index = -1;
1487  ast->packet_size = 0;
1488  }
1489 
1490  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1492  goto resync;
1493  }
1494  ast->seek_pos= 0;
1495 
1496  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1497  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1498 
1499  if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1500  avi->non_interleaved= 1;
1501  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1502  }else if (avi->dts_max < dts)
1503  avi->dts_max = dts;
1504  }
1505 
1506  return 0;
1507  }
1508 
1509  if ((err = avi_sync(s, 0)) < 0)
1510  return err;
1511  goto resync;
1512 }
1513 
1514 /* XXX: We make the implicit supposition that the positions are sorted
1515  * for each stream. */
1516 static int avi_read_idx1(AVFormatContext *s, int size)
1517 {
1518  AVIContext *avi = s->priv_data;
1519  AVIOContext *pb = s->pb;
1520  int nb_index_entries, i;
1521  AVStream *st;
1522  AVIStream *ast;
1523  unsigned int index, tag, flags, pos, len, first_packet = 1;
1524  unsigned last_pos = -1;
1525  unsigned last_idx = -1;
1526  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1527  int anykey = 0;
1528 
1529  nb_index_entries = size / 16;
1530  if (nb_index_entries <= 0)
1531  return AVERROR_INVALIDDATA;
1532 
1533  idx1_pos = avio_tell(pb);
1534  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1535  if (avi_sync(s, 1) == 0)
1536  first_packet_pos = avio_tell(pb) - 8;
1537  avi->stream_index = -1;
1538  avio_seek(pb, idx1_pos, SEEK_SET);
1539 
1540  if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1541  first_packet_pos = 0;
1542  data_offset = avi->movi_list;
1543  }
1544 
1545  /* Read the entries and sort them in each stream component. */
1546  for (i = 0; i < nb_index_entries; i++) {
1547  if (avio_feof(pb))
1548  return -1;
1549 
1550  tag = avio_rl32(pb);
1551  flags = avio_rl32(pb);
1552  pos = avio_rl32(pb);
1553  len = avio_rl32(pb);
1554  av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1555  i, tag, flags, pos, len);
1556 
1557  index = ((tag & 0xff) - '0') * 10;
1558  index += (tag >> 8 & 0xff) - '0';
1559  if (index >= s->nb_streams)
1560  continue;
1561  st = s->streams[index];
1562  ast = st->priv_data;
1563 
1564  if (first_packet && first_packet_pos) {
1565  data_offset = first_packet_pos - pos;
1566  first_packet = 0;
1567  }
1568  pos += data_offset;
1569 
1570  av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1571 
1572  // even if we have only a single stream, we should
1573  // switch to non-interleaved to get correct timestamps
1574  if (last_pos == pos)
1575  avi->non_interleaved = 1;
1576  if (last_idx != pos && len) {
1577  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1578  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1579  last_idx= pos;
1580  }
1581  ast->cum_len += get_duration(ast, len);
1582  last_pos = pos;
1583  anykey |= flags&AVIIF_INDEX;
1584  }
1585  if (!anykey) {
1586  for (index = 0; index < s->nb_streams; index++) {
1587  st = s->streams[index];
1588  if (st->nb_index_entries)
1590  }
1591  }
1592  return 0;
1593 }
1594 
1595 /* Scan the index and consider any file with streams more than
1596  * 2 seconds or 64MB apart non-interleaved. */
1598 {
1599  int64_t min_pos, pos;
1600  int i;
1601  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1602  if (!idx)
1603  return AVERROR(ENOMEM);
1604  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1605  int64_t max_dts = INT64_MIN / 2;
1606  int64_t min_dts = INT64_MAX / 2;
1607  int64_t max_buffer = 0;
1608 
1609  min_pos = INT64_MAX;
1610 
1611  for (i = 0; i < s->nb_streams; i++) {
1612  AVStream *st = s->streams[i];
1613  AVIStream *ast = st->priv_data;
1614  int n = st->nb_index_entries;
1615  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1616  idx[i]++;
1617  if (idx[i] < n) {
1618  int64_t dts;
1619  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1620  FFMAX(ast->sample_size, 1),
1621  st->time_base, AV_TIME_BASE_Q);
1622  min_dts = FFMIN(min_dts, dts);
1623  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1624  }
1625  }
1626  for (i = 0; i < s->nb_streams; i++) {
1627  AVStream *st = s->streams[i];
1628  AVIStream *ast = st->priv_data;
1629 
1630  if (idx[i] && min_dts != INT64_MAX / 2) {
1631  int64_t dts;
1632  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1633  FFMAX(ast->sample_size, 1),
1634  st->time_base, AV_TIME_BASE_Q);
1635  max_dts = FFMAX(max_dts, dts);
1636  max_buffer = FFMAX(max_buffer,
1637  av_rescale(dts - min_dts,
1638  st->codec->bit_rate,
1639  AV_TIME_BASE));
1640  }
1641  }
1642  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1643  max_buffer > 1024 * 1024 * 8 * 8) {
1644  av_free(idx);
1645  return 1;
1646  }
1647  }
1648  av_free(idx);
1649  return 0;
1650 }
1651 
1653 {
1654  int i;
1655  int64_t last_start = 0;
1656  int64_t first_end = INT64_MAX;
1657  int64_t oldpos = avio_tell(s->pb);
1658 
1659  for (i = 0; i < s->nb_streams; i++) {
1660  AVStream *st = s->streams[i];
1661  int n = st->nb_index_entries;
1662  unsigned int size;
1663 
1664  if (n <= 0)
1665  continue;
1666 
1667  if (n >= 2) {
1668  int64_t pos = st->index_entries[0].pos;
1669  avio_seek(s->pb, pos + 4, SEEK_SET);
1670  size = avio_rl32(s->pb);
1671  if (pos + size > st->index_entries[1].pos)
1672  last_start = INT64_MAX;
1673  }
1674 
1675  if (st->index_entries[0].pos > last_start)
1676  last_start = st->index_entries[0].pos;
1677  if (st->index_entries[n - 1].pos < first_end)
1678  first_end = st->index_entries[n - 1].pos;
1679  }
1680  avio_seek(s->pb, oldpos, SEEK_SET);
1681 
1682  if (last_start > first_end)
1683  return 1;
1684 
1685  return check_stream_max_drift(s);
1686 }
1687 
1689 {
1690  AVIContext *avi = s->priv_data;
1691  AVIOContext *pb = s->pb;
1692  uint32_t tag, size;
1693  int64_t pos = avio_tell(pb);
1694  int64_t next;
1695  int ret = -1;
1696 
1697  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1698  goto the_end; // maybe truncated file
1699  av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1700  for (;;) {
1701  tag = avio_rl32(pb);
1702  size = avio_rl32(pb);
1703  if (avio_feof(pb))
1704  break;
1705  next = avio_tell(pb) + size + (size & 1);
1706 
1707  av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n",
1708  tag & 0xff,
1709  (tag >> 8) & 0xff,
1710  (tag >> 16) & 0xff,
1711  (tag >> 24) & 0xff,
1712  size);
1713 
1714  if (tag == MKTAG('i', 'd', 'x', '1') &&
1715  avi_read_idx1(s, size) >= 0) {
1716  avi->index_loaded=2;
1717  ret = 0;
1718  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1719  uint32_t tag1 = avio_rl32(pb);
1720 
1721  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1722  ff_read_riff_info(s, size - 4);
1723  }else if (!ret)
1724  break;
1725 
1726  if (avio_seek(pb, next, SEEK_SET) < 0)
1727  break; // something is wrong here
1728  }
1729 
1730 the_end:
1731  avio_seek(pb, pos, SEEK_SET);
1732  return ret;
1733 }
1734 
1735 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1736 {
1737  AVIStream *ast2 = st2->priv_data;
1738  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1739  av_free_packet(&ast2->sub_pkt);
1740  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1741  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1742  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1743 }
1744 
1745 static int avi_read_seek(AVFormatContext *s, int stream_index,
1746  int64_t timestamp, int flags)
1747 {
1748  AVIContext *avi = s->priv_data;
1749  AVStream *st;
1750  int i, index;
1751  int64_t pos, pos_min;
1752  AVIStream *ast;
1753 
1754  /* Does not matter which stream is requested dv in avi has the
1755  * stream information in the first video stream.
1756  */
1757  if (avi->dv_demux)
1758  stream_index = 0;
1759 
1760  if (!avi->index_loaded) {
1761  /* we only load the index on demand */
1762  avi_load_index(s);
1763  avi->index_loaded |= 1;
1764  }
1765  av_assert0(stream_index >= 0);
1766 
1767  st = s->streams[stream_index];
1768  ast = st->priv_data;
1769  index = av_index_search_timestamp(st,
1770  timestamp * FFMAX(ast->sample_size, 1),
1771  flags);
1772  if (index < 0) {
1773  if (st->nb_index_entries > 0)
1774  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1775  timestamp * FFMAX(ast->sample_size, 1),
1776  st->index_entries[0].timestamp,
1778  return AVERROR_INVALIDDATA;
1779  }
1780 
1781  /* find the position */
1782  pos = st->index_entries[index].pos;
1783  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1784 
1785  av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1786  timestamp, index, st->index_entries[index].timestamp);
1787 
1788  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1789  /* One and only one real stream for DV in AVI, and it has video */
1790  /* offsets. Calling with other stream indexes should have failed */
1791  /* the av_index_search_timestamp call above. */
1792 
1793  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1794  return -1;
1795 
1796  /* Feed the DV video stream version of the timestamp to the */
1797  /* DV demux so it can synthesize correct timestamps. */
1798  ff_dv_offset_reset(avi->dv_demux, timestamp);
1799 
1800  avi->stream_index = -1;
1801  return 0;
1802  }
1803 
1804  pos_min = pos;
1805  for (i = 0; i < s->nb_streams; i++) {
1806  AVStream *st2 = s->streams[i];
1807  AVIStream *ast2 = st2->priv_data;
1808 
1809  ast2->packet_size =
1810  ast2->remaining = 0;
1811 
1812  if (ast2->sub_ctx) {
1813  seek_subtitle(st, st2, timestamp);
1814  continue;
1815  }
1816 
1817  if (st2->nb_index_entries <= 0)
1818  continue;
1819 
1820 // av_assert1(st2->codec->block_align);
1821  av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
1822  index = av_index_search_timestamp(st2,
1823  av_rescale_q(timestamp,
1824  st->time_base,
1825  st2->time_base) *
1826  FFMAX(ast2->sample_size, 1),
1827  flags |
1830  if (index < 0)
1831  index = 0;
1832  ast2->seek_pos = st2->index_entries[index].pos;
1833  pos_min = FFMIN(pos_min,ast2->seek_pos);
1834  }
1835  for (i = 0; i < s->nb_streams; i++) {
1836  AVStream *st2 = s->streams[i];
1837  AVIStream *ast2 = st2->priv_data;
1838 
1839  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1840  continue;
1841 
1842  index = av_index_search_timestamp(
1843  st2,
1844  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1846  if (index < 0)
1847  index = 0;
1848  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1849  index--;
1850  ast2->frame_offset = st2->index_entries[index].timestamp;
1851  }
1852 
1853  /* do the seek */
1854  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1855  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1856  return -1;
1857  }
1858  avi->stream_index = -1;
1859  avi->dts_max = INT_MIN;
1860  return 0;
1861 }
1862 
1864 {
1865  int i;
1866  AVIContext *avi = s->priv_data;
1867 
1868  for (i = 0; i < s->nb_streams; i++) {
1869  AVStream *st = s->streams[i];
1870  AVIStream *ast = st->priv_data;
1871  if (ast) {
1872  if (ast->sub_ctx) {
1873  av_freep(&ast->sub_ctx->pb);
1875  }
1876  av_freep(&ast->sub_buffer);
1877  av_free_packet(&ast->sub_pkt);
1878  }
1879  }
1880 
1881  av_freep(&avi->dv_demux);
1882 
1883  return 0;
1884 }
1885 
1886 static int avi_probe(AVProbeData *p)
1887 {
1888  int i;
1889 
1890  /* check file header */
1891  for (i = 0; avi_headers[i][0]; i++)
1892  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1893  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1894  return AVPROBE_SCORE_MAX;
1895 
1896  return 0;
1897 }
1898 
1900  .name = "avi",
1901  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1902  .priv_data_size = sizeof(AVIContext),
1903  .extensions = "avi",
1904  .read_probe = avi_probe,
1909  .priv_class = &demuxer_class,
1910 };