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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 "riff.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
39 
40 typedef struct AVIStream {
41  int64_t frame_offset; /* current frame (video) or byte (audio) counter
42  * (used to compute the pts) */
43  int remaining;
45 
46  uint32_t handler;
47  uint32_t scale;
48  uint32_t rate;
49  int sample_size; /* size of one sample (or packet)
50  * (in the rate/scale sense) in bytes */
51 
52  int64_t cum_len; /* temporary storage (used during seek) */
53  int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
55  uint32_t pal[256];
56  int has_pal;
57  int dshow_block_align; /* block align variable used to emulate bugs in
58  * the MS dshow demuxer */
59 
63 
64  int64_t seek_pos;
65 } AVIStream;
66 
67 typedef struct {
68  const AVClass *class;
69  int64_t riff_end;
70  int64_t movi_end;
71  int64_t fsize;
72  int64_t io_fsize;
73  int64_t movi_list;
74  int64_t last_pkt_pos;
76  int is_odml;
81  int use_odml;
82 #define MAX_ODML_DEPTH 1000
83  int64_t dts_max;
84 } AVIContext;
85 
86 
87 static const AVOption options[] = {
88  { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
89  { NULL },
90 };
91 
92 static const AVClass demuxer_class = {
93  .class_name = "avi",
94  .item_name = av_default_item_name,
95  .option = options,
96  .version = LIBAVUTIL_VERSION_INT,
97  .category = AV_CLASS_CATEGORY_DEMUXER,
98 };
99 
100 
101 static const char avi_headers[][8] = {
102  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
103  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
104  { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
105  { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
106  { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
107  { 0 }
108 };
109 
111  { "strn", "title" },
112  { 0 },
113 };
114 
115 static int avi_load_index(AVFormatContext *s);
116 static int guess_ni_flag(AVFormatContext *s);
117 
118 #define print_tag(str, tag, size) \
119  av_dlog(NULL, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
120  avio_tell(pb), str, tag & 0xff, \
121  (tag >> 8) & 0xff, \
122  (tag >> 16) & 0xff, \
123  (tag >> 24) & 0xff, \
124  size)
125 
126 static inline int get_duration(AVIStream *ast, int len)
127 {
128  if (ast->sample_size)
129  return len;
130  else if (ast->dshow_block_align > 1)
131  return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
132  else
133  return 1;
134 }
135 
137 {
138  AVIContext *avi = s->priv_data;
139  char header[8];
140  int i;
141 
142  /* check RIFF header */
143  avio_read(pb, header, 4);
144  avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
145  avi->riff_end += avio_tell(pb); /* RIFF chunk end */
146  avio_read(pb, header + 4, 4);
147 
148  for (i = 0; avi_headers[i][0]; i++)
149  if (!memcmp(header, avi_headers[i], 8))
150  break;
151  if (!avi_headers[i][0])
152  return AVERROR_INVALIDDATA;
153 
154  if (header[7] == 0x19)
155  av_log(s, AV_LOG_INFO,
156  "This file has been generated by a totally broken muxer.\n");
157 
158  return 0;
159 }
160 
161 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
162 {
163  AVIContext *avi = s->priv_data;
164  AVIOContext *pb = s->pb;
165  int longs_pre_entry = avio_rl16(pb);
166  int index_sub_type = avio_r8(pb);
167  int index_type = avio_r8(pb);
168  int entries_in_use = avio_rl32(pb);
169  int chunk_id = avio_rl32(pb);
170  int64_t base = avio_rl64(pb);
171  int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
172  ((chunk_id >> 8 & 0xFF) - '0');
173  AVStream *st;
174  AVIStream *ast;
175  int i;
176  int64_t last_pos = -1;
177  int64_t filesize = avi->fsize;
178 
179  av_dlog(s,
180  "longs_pre_entry:%d index_type:%d entries_in_use:%d "
181  "chunk_id:%X base:%16"PRIX64"\n",
182  longs_pre_entry,
183  index_type,
184  entries_in_use,
185  chunk_id,
186  base);
187 
188  if (stream_id >= s->nb_streams || stream_id < 0)
189  return AVERROR_INVALIDDATA;
190  st = s->streams[stream_id];
191  ast = st->priv_data;
192 
193  if (index_sub_type)
194  return AVERROR_INVALIDDATA;
195 
196  avio_rl32(pb);
197 
198  if (index_type && longs_pre_entry != 2)
199  return AVERROR_INVALIDDATA;
200  if (index_type > 1)
201  return AVERROR_INVALIDDATA;
202 
203  if (filesize > 0 && base >= filesize) {
204  av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
205  if (base >> 32 == (base & 0xFFFFFFFF) &&
206  (base & 0xFFFFFFFF) < filesize &&
207  filesize <= 0xFFFFFFFF)
208  base &= 0xFFFFFFFF;
209  else
210  return AVERROR_INVALIDDATA;
211  }
212 
213  for (i = 0; i < entries_in_use; i++) {
214  if (index_type) {
215  int64_t pos = avio_rl32(pb) + base - 8;
216  int len = avio_rl32(pb);
217  int key = len >= 0;
218  len &= 0x7FFFFFFF;
219 
220 #ifdef DEBUG_SEEK
221  av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
222 #endif
223  if (avio_feof(pb))
224  return AVERROR_INVALIDDATA;
225 
226  if (last_pos == pos || pos == base - 8)
227  avi->non_interleaved = 1;
228  if (last_pos != pos && len)
229  av_add_index_entry(st, pos, ast->cum_len, len, 0,
230  key ? AVINDEX_KEYFRAME : 0);
231 
232  ast->cum_len += get_duration(ast, len);
233  last_pos = pos;
234  } else {
235  int64_t offset, pos;
236  int duration;
237  offset = avio_rl64(pb);
238  avio_rl32(pb); /* size */
239  duration = avio_rl32(pb);
240 
241  if (avio_feof(pb))
242  return AVERROR_INVALIDDATA;
243 
244  pos = avio_tell(pb);
245 
246  if (avi->odml_depth > MAX_ODML_DEPTH) {
247  av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
248  return AVERROR_INVALIDDATA;
249  }
250 
251  if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
252  return -1;
253  avi->odml_depth++;
254  read_braindead_odml_indx(s, frame_num);
255  avi->odml_depth--;
256  frame_num += duration;
257 
258  if (avio_seek(pb, pos, SEEK_SET) < 0) {
259  av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
260  return -1;
261  }
262 
263  }
264  }
265  avi->index_loaded = 2;
266  return 0;
267 }
268 
270 {
271  int i;
272  int64_t j;
273 
274  for (i = 0; i < s->nb_streams; i++) {
275  AVStream *st = s->streams[i];
276  AVIStream *ast = st->priv_data;
277  int n = st->nb_index_entries;
278  int max = ast->sample_size;
279  int64_t pos, size, ts;
280 
281  if (n != 1 || ast->sample_size == 0)
282  continue;
283 
284  while (max < 1024)
285  max += max;
286 
287  pos = st->index_entries[0].pos;
288  size = st->index_entries[0].size;
289  ts = st->index_entries[0].timestamp;
290 
291  for (j = 0; j < size; j += max)
292  av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
294  }
295 }
296 
297 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
298  uint32_t size)
299 {
300  AVIOContext *pb = s->pb;
301  char key[5] = { 0 };
302  char *value;
303 
304  size += (size & 1);
305 
306  if (size == UINT_MAX)
307  return AVERROR(EINVAL);
308  value = av_malloc(size + 1);
309  if (!value)
310  return AVERROR(ENOMEM);
311  avio_read(pb, value, size);
312  value[size] = 0;
313 
314  AV_WL32(key, tag);
315 
316  return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
318 }
319 
320 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
321  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
322 
323 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
324 {
325  char month[4], time[9], buffer[64];
326  int i, day, year;
327  /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
328  if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
329  month, &day, time, &year) == 4) {
330  for (i = 0; i < 12; i++)
331  if (!av_strcasecmp(month, months[i])) {
332  snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
333  year, i + 1, day, time);
334  av_dict_set(metadata, "creation_time", buffer, 0);
335  }
336  } else if (date[4] == '/' && date[7] == '/') {
337  date[4] = date[7] = '-';
338  av_dict_set(metadata, "creation_time", date, 0);
339  }
340 }
341 
342 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
343 {
344  while (avio_tell(s->pb) < end) {
345  uint32_t tag = avio_rl32(s->pb);
346  uint32_t size = avio_rl32(s->pb);
347  switch (tag) {
348  case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
349  {
350  uint64_t tag_end = avio_tell(s->pb) + size;
351  while (avio_tell(s->pb) < tag_end) {
352  uint16_t tag = avio_rl16(s->pb);
353  uint16_t size = avio_rl16(s->pb);
354  const char *name = NULL;
355  char buffer[64] = { 0 };
356  size = FFMIN(size, tag_end - avio_tell(s->pb));
357  size -= avio_read(s->pb, buffer,
358  FFMIN(size, sizeof(buffer) - 1));
359  switch (tag) {
360  case 0x03:
361  name = "maker";
362  break;
363  case 0x04:
364  name = "model";
365  break;
366  case 0x13:
367  name = "creation_time";
368  if (buffer[4] == ':' && buffer[7] == ':')
369  buffer[4] = buffer[7] = '-';
370  break;
371  }
372  if (name)
373  av_dict_set(&s->metadata, name, buffer, 0);
374  avio_skip(s->pb, size);
375  }
376  break;
377  }
378  default:
379  avio_skip(s->pb, size);
380  break;
381  }
382  }
383 }
384 
386 {
387  GetByteContext gb;
388  uint8_t *data = st->codec->extradata;
389  int data_size = st->codec->extradata_size;
390  int tag, offset;
391 
392  if (!data || data_size < 8) {
393  return AVERROR_INVALIDDATA;
394  }
395 
396  bytestream2_init(&gb, data, data_size);
397 
398  tag = bytestream2_get_le32(&gb);
399 
400  switch (tag) {
401  case MKTAG('A', 'V', 'I', 'F'):
402  // skip 4 byte padding
403  bytestream2_skip(&gb, 4);
404  offset = bytestream2_tell(&gb);
405  bytestream2_init(&gb, data + offset, data_size - offset);
406 
407  // decode EXIF tags from IFD, AVI is always little-endian
408  return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
409  break;
410  case MKTAG('C', 'A', 'S', 'I'):
411  avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
412  break;
413  case MKTAG('Z', 'o', 'r', 'a'):
414  avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag);
415  break;
416  default:
417  break;
418  }
419 
420  return 0;
421 }
422 
424 {
425  AVIContext *avi = s->priv_data;
426  int i, j;
427  int64_t lensum = 0;
428  int64_t maxpos = 0;
429 
430  for (i = 0; i<s->nb_streams; i++) {
431  int64_t len = 0;
432  AVStream *st = s->streams[i];
433 
434  if (!st->nb_index_entries)
435  continue;
436 
437  for (j = 0; j < st->nb_index_entries; j++)
438  len += st->index_entries[j].size;
439  maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
440  lensum += len;
441  }
442  if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
443  return 0;
444  if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
445  return 0;
446 
447  for (i = 0; i<s->nb_streams; i++) {
448  int64_t len = 0;
449  AVStream *st = s->streams[i];
450  int64_t duration;
451 
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->codec->bit_rate > 0)
456  continue;
457  duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
458  st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
459  }
460  return 1;
461 }
462 
464 {
465  AVIContext *avi = s->priv_data;
466  AVIOContext *pb = s->pb;
467  unsigned int tag, tag1, handler;
468  int codec_type, stream_index, frame_period;
469  unsigned int size;
470  int i;
471  AVStream *st;
472  AVIStream *ast = NULL;
473  int avih_width = 0, avih_height = 0;
474  int amv_file_format = 0;
475  uint64_t list_end = 0;
476  int ret;
477  AVDictionaryEntry *dict_entry;
478 
479  avi->stream_index = -1;
480 
481  ret = get_riff(s, pb);
482  if (ret < 0)
483  return ret;
484 
485  av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
486 
487  avi->io_fsize = avi->fsize = avio_size(pb);
488  if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
489  avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
490 
491  /* first list tag */
492  stream_index = -1;
493  codec_type = -1;
494  frame_period = 0;
495  for (;;) {
496  if (avio_feof(pb))
497  goto fail;
498  tag = avio_rl32(pb);
499  size = avio_rl32(pb);
500 
501  print_tag("tag", tag, size);
502 
503  switch (tag) {
504  case MKTAG('L', 'I', 'S', 'T'):
505  list_end = avio_tell(pb) + size;
506  /* Ignored, except at start of video packets. */
507  tag1 = avio_rl32(pb);
508 
509  print_tag("list", tag1, 0);
510 
511  if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
512  avi->movi_list = avio_tell(pb) - 4;
513  if (size)
514  avi->movi_end = avi->movi_list + size + (size & 1);
515  else
516  avi->movi_end = avi->fsize;
517  av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
518  goto end_of_header;
519  } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
520  ff_read_riff_info(s, size - 4);
521  else if (tag1 == MKTAG('n', 'c', 'd', 't'))
522  avi_read_nikon(s, list_end);
523 
524  break;
525  case MKTAG('I', 'D', 'I', 'T'):
526  {
527  unsigned char date[64] = { 0 };
528  size += (size & 1);
529  size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
530  avio_skip(pb, size);
532  break;
533  }
534  case MKTAG('d', 'm', 'l', 'h'):
535  avi->is_odml = 1;
536  avio_skip(pb, size + (size & 1));
537  break;
538  case MKTAG('a', 'm', 'v', 'h'):
539  amv_file_format = 1;
540  case MKTAG('a', 'v', 'i', 'h'):
541  /* AVI header */
542  /* using frame_period is bad idea */
543  frame_period = avio_rl32(pb);
544  avio_rl32(pb); /* max. bytes per second */
545  avio_rl32(pb);
547 
548  avio_skip(pb, 2 * 4);
549  avio_rl32(pb);
550  avio_rl32(pb);
551  avih_width = avio_rl32(pb);
552  avih_height = avio_rl32(pb);
553 
554  avio_skip(pb, size - 10 * 4);
555  break;
556  case MKTAG('s', 't', 'r', 'h'):
557  /* stream header */
558 
559  tag1 = avio_rl32(pb);
560  handler = avio_rl32(pb); /* codec tag */
561 
562  if (tag1 == MKTAG('p', 'a', 'd', 's')) {
563  avio_skip(pb, size - 8);
564  break;
565  } else {
566  stream_index++;
567  st = avformat_new_stream(s, NULL);
568  if (!st)
569  goto fail;
570 
571  st->id = stream_index;
572  ast = av_mallocz(sizeof(AVIStream));
573  if (!ast)
574  goto fail;
575  st->priv_data = ast;
576  }
577  if (amv_file_format)
578  tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
579  : MKTAG('v', 'i', 'd', 's');
580 
581  print_tag("strh", tag1, -1);
582 
583  if (tag1 == MKTAG('i', 'a', 'v', 's') ||
584  tag1 == MKTAG('i', 'v', 'a', 's')) {
585  int64_t dv_dur;
586 
587  /* After some consideration -- I don't think we
588  * have to support anything but DV in type1 AVIs. */
589  if (s->nb_streams != 1)
590  goto fail;
591 
592  if (handler != MKTAG('d', 'v', 's', 'd') &&
593  handler != MKTAG('d', 'v', 'h', 'd') &&
594  handler != MKTAG('d', 'v', 's', 'l'))
595  goto fail;
596 
597  ast = s->streams[0]->priv_data;
598  av_freep(&s->streams[0]->codec->extradata);
599  av_freep(&s->streams[0]->codec);
600  if (s->streams[0]->info)
602  av_freep(&s->streams[0]->info);
603  av_freep(&s->streams[0]);
604  s->nb_streams = 0;
605  if (CONFIG_DV_DEMUXER) {
606  avi->dv_demux = avpriv_dv_init_demux(s);
607  if (!avi->dv_demux)
608  goto fail;
609  } else
610  goto fail;
611  s->streams[0]->priv_data = ast;
612  avio_skip(pb, 3 * 4);
613  ast->scale = avio_rl32(pb);
614  ast->rate = avio_rl32(pb);
615  avio_skip(pb, 4); /* start time */
616 
617  dv_dur = avio_rl32(pb);
618  if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
619  dv_dur *= AV_TIME_BASE;
620  s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
621  }
622  /* else, leave duration alone; timing estimation in utils.c
623  * will make a guess based on bitrate. */
624 
625  stream_index = s->nb_streams - 1;
626  avio_skip(pb, size - 9 * 4);
627  break;
628  }
629 
630  av_assert0(stream_index < s->nb_streams);
631  ast->handler = handler;
632 
633  avio_rl32(pb); /* flags */
634  avio_rl16(pb); /* priority */
635  avio_rl16(pb); /* language */
636  avio_rl32(pb); /* initial frame */
637  ast->scale = avio_rl32(pb);
638  ast->rate = avio_rl32(pb);
639  if (!(ast->scale && ast->rate)) {
641  "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
642  "(This file has been generated by broken software.)\n",
643  ast->scale,
644  ast->rate);
645  if (frame_period) {
646  ast->rate = 1000000;
647  ast->scale = frame_period;
648  } else {
649  ast->rate = 25;
650  ast->scale = 1;
651  }
652  }
653  avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
654 
655  ast->cum_len = avio_rl32(pb); /* start */
656  st->nb_frames = avio_rl32(pb);
657 
658  st->start_time = 0;
659  avio_rl32(pb); /* buffer size */
660  avio_rl32(pb); /* quality */
661  if (ast->cum_len*ast->scale/ast->rate > 3600) {
662  av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
663  ast->cum_len = 0;
664  }
665  ast->sample_size = avio_rl32(pb); /* sample ssize */
666  ast->cum_len *= FFMAX(1, ast->sample_size);
667  av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
668  ast->rate, ast->scale, ast->sample_size);
669 
670  switch (tag1) {
671  case MKTAG('v', 'i', 'd', 's'):
672  codec_type = AVMEDIA_TYPE_VIDEO;
673 
674  ast->sample_size = 0;
675  st->avg_frame_rate = av_inv_q(st->time_base);
676  break;
677  case MKTAG('a', 'u', 'd', 's'):
678  codec_type = AVMEDIA_TYPE_AUDIO;
679  break;
680  case MKTAG('t', 'x', 't', 's'):
681  codec_type = AVMEDIA_TYPE_SUBTITLE;
682  break;
683  case MKTAG('d', 'a', 't', 's'):
684  codec_type = AVMEDIA_TYPE_DATA;
685  break;
686  default:
687  av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
688  }
689  if (ast->sample_size == 0) {
690  st->duration = st->nb_frames;
691  if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
692  av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
693  st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
694  }
695  }
696  ast->frame_offset = ast->cum_len;
697  avio_skip(pb, size - 12 * 4);
698  break;
699  case MKTAG('s', 't', 'r', 'f'):
700  /* stream header */
701  if (!size)
702  break;
703  if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
704  avio_skip(pb, size);
705  } else {
706  uint64_t cur_pos = avio_tell(pb);
707  unsigned esize;
708  if (cur_pos < list_end)
709  size = FFMIN(size, list_end - cur_pos);
710  st = s->streams[stream_index];
711  if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
712  avio_skip(pb, size);
713  break;
714  }
715  switch (codec_type) {
716  case AVMEDIA_TYPE_VIDEO:
717  if (amv_file_format) {
718  st->codec->width = avih_width;
719  st->codec->height = avih_height;
722  avio_skip(pb, size);
723  break;
724  }
725  tag1 = ff_get_bmp_header(pb, st, &esize);
726 
727  if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
728  tag1 == MKTAG('D', 'X', 'S', 'A')) {
730  st->codec->codec_tag = tag1;
732  break;
733  }
734 
735  if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
736  if (esize == size-1 && (esize&1)) {
737  st->codec->extradata_size = esize - 10 * 4;
738  } else
739  st->codec->extradata_size = size - 10 * 4;
740  if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
741  return AVERROR(ENOMEM);
742  }
743 
744  // FIXME: check if the encoder really did this correctly
745  if (st->codec->extradata_size & 1)
746  avio_r8(pb);
747 
748  /* Extract palette from extradata if bpp <= 8.
749  * This code assumes that extradata contains only palette.
750  * This is true for all paletted codecs implemented in
751  * FFmpeg. */
752  if (st->codec->extradata_size &&
753  (st->codec->bits_per_coded_sample <= 8)) {
754  int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
755  const uint8_t *pal_src;
756 
757  pal_size = FFMIN(pal_size, st->codec->extradata_size);
758  pal_src = st->codec->extradata +
759  st->codec->extradata_size - pal_size;
760  /* Exclude the "BottomUp" field from the palette */
761  if (pal_src - st->codec->extradata >= 9 &&
762  !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
763  pal_src -= 9;
764  for (i = 0; i < pal_size / 4; i++)
765  ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
766  ast->has_pal = 1;
767  }
768 
769  print_tag("video", tag1, 0);
770 
772  st->codec->codec_tag = tag1;
774  tag1);
775  /* This is needed to get the pict type which is necessary
776  * for generating correct pts. */
778 
779  if (st->codec->codec_id == AV_CODEC_ID_MPEG4 &&
780  ast->handler == MKTAG('X', 'V', 'I', 'D'))
781  st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D');
782 
783  if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
785 
786  if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
787  st->codec->extradata_size < 1U << 30) {
788  st->codec->extradata_size += 9;
789  if ((ret = av_reallocp(&st->codec->extradata,
790  st->codec->extradata_size +
792  st->codec->extradata_size = 0;
793  return ret;
794  } else
795  memcpy(st->codec->extradata + st->codec->extradata_size - 9,
796  "BottomUp", 9);
797  }
798  st->codec->height = FFABS(st->codec->height);
799 
800 // avio_skip(pb, size - 5 * 4);
801  break;
802  case AVMEDIA_TYPE_AUDIO:
803  ret = ff_get_wav_header(pb, st->codec, size, 0);
804  if (ret < 0)
805  return ret;
806  ast->dshow_block_align = st->codec->block_align;
807  if (ast->sample_size && st->codec->block_align &&
808  ast->sample_size != st->codec->block_align) {
809  av_log(s,
811  "sample size (%d) != block align (%d)\n",
812  ast->sample_size,
813  st->codec->block_align);
814  ast->sample_size = st->codec->block_align;
815  }
816  /* 2-aligned
817  * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
818  if (size & 1)
819  avio_skip(pb, 1);
820  /* Force parsing as several audio frames can be in
821  * one packet and timestamps refer to packet start. */
823  /* ADTS header is in extradata, AAC without header must be
824  * stored as exact frames. Parser not needed and it will
825  * fail. */
826  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
827  st->codec->extradata_size)
829  /* AVI files with Xan DPCM audio (wrongly) declare PCM
830  * audio in the header but have Axan as stream_code_tag. */
831  if (ast->handler == AV_RL32("Axan")) {
833  st->codec->codec_tag = 0;
834  ast->dshow_block_align = 0;
835  }
836  if (amv_file_format) {
838  ast->dshow_block_align = 0;
839  }
840  if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
841  av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
842  ast->dshow_block_align = 0;
843  }
844  if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
845  st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
846  st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
847  av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
848  ast->sample_size = 0;
849  }
850  break;
853  st->request_probe= 1;
854  avio_skip(pb, size);
855  break;
856  default:
859  st->codec->codec_tag = 0;
860  avio_skip(pb, size);
861  break;
862  }
863  }
864  break;
865  case MKTAG('s', 't', 'r', 'd'):
866  if (stream_index >= (unsigned)s->nb_streams
867  || s->streams[stream_index]->codec->extradata_size
868  || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
869  avio_skip(pb, size);
870  } else {
871  uint64_t cur_pos = avio_tell(pb);
872  if (cur_pos < list_end)
873  size = FFMIN(size, list_end - cur_pos);
874  st = s->streams[stream_index];
875 
876  if (size<(1<<30)) {
877  if (ff_get_extradata(st->codec, pb, size) < 0)
878  return AVERROR(ENOMEM);
879  }
880 
881  if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
882  avio_r8(pb);
883 
884  ret = avi_extract_stream_metadata(st);
885  if (ret < 0) {
886  av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
887  }
888  }
889  break;
890  case MKTAG('i', 'n', 'd', 'x'):
891  i = avio_tell(pb);
892  if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
893  avi->use_odml &&
894  read_braindead_odml_indx(s, 0) < 0 &&
896  goto fail;
897  avio_seek(pb, i + size, SEEK_SET);
898  break;
899  case MKTAG('v', 'p', 'r', 'p'):
900  if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
901  AVRational active, active_aspect;
902 
903  st = s->streams[stream_index];
904  avio_rl32(pb);
905  avio_rl32(pb);
906  avio_rl32(pb);
907  avio_rl32(pb);
908  avio_rl32(pb);
909 
910  active_aspect.den = avio_rl16(pb);
911  active_aspect.num = avio_rl16(pb);
912  active.num = avio_rl32(pb);
913  active.den = avio_rl32(pb);
914  avio_rl32(pb); // nbFieldsPerFrame
915 
916  if (active_aspect.num && active_aspect.den &&
917  active.num && active.den) {
918  st->sample_aspect_ratio = av_div_q(active_aspect, active);
919  av_dlog(s, "vprp %d/%d %d/%d\n",
920  active_aspect.num, active_aspect.den,
921  active.num, active.den);
922  }
923  size -= 9 * 4;
924  }
925  avio_skip(pb, size);
926  break;
927  case MKTAG('s', 't', 'r', 'n'):
928  if (s->nb_streams) {
929  ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
930  if (ret < 0)
931  return ret;
932  break;
933  }
934  default:
935  if (size > 1000000) {
936  av_log(s, AV_LOG_ERROR,
937  "Something went wrong during header parsing, "
938  "I will ignore it and try to continue anyway.\n");
940  goto fail;
941  avi->movi_list = avio_tell(pb) - 4;
942  avi->movi_end = avi->fsize;
943  goto end_of_header;
944  }
945  /* skip tag */
946  size += (size & 1);
947  avio_skip(pb, size);
948  break;
949  }
950  }
951 
952 end_of_header:
953  /* check stream number */
954  if (stream_index != s->nb_streams - 1) {
955 
956 fail:
957  return AVERROR_INVALIDDATA;
958  }
959 
960  if (!avi->index_loaded && pb->seekable)
961  avi_load_index(s);
963  avi->index_loaded |= 1;
964 
965  if ((ret = guess_ni_flag(s)) < 0)
966  return ret;
967 
968  avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
969 
970  dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
971  if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
972  for (i = 0; i < s->nb_streams; i++) {
973  AVStream *st = s->streams[i];
977  }
978 
979  for (i = 0; i < s->nb_streams; i++) {
980  AVStream *st = s->streams[i];
981  if (st->nb_index_entries)
982  break;
983  }
984  // DV-in-AVI cannot be non-interleaved, if set this must be
985  // a mis-detection.
986  if (avi->dv_demux)
987  avi->non_interleaved = 0;
988  if (i == s->nb_streams && avi->non_interleaved) {
990  "Non-interleaved AVI without index, switching to interleaved\n");
991  avi->non_interleaved = 0;
992  }
993 
994  if (avi->non_interleaved) {
995  av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
996  clean_index(s);
997  }
998 
999  ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1001 
1002  return 0;
1003 }
1004 
1006 {
1007  if (pkt->size >= 7 &&
1008  pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1009  !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1010  uint8_t desc[256];
1011  int score = AVPROBE_SCORE_EXTENSION, ret;
1012  AVIStream *ast = st->priv_data;
1013  AVInputFormat *sub_demuxer;
1014  AVRational time_base;
1015  int size;
1016  AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1017  pkt->size - 7,
1018  0, NULL, NULL, NULL, NULL);
1019  AVProbeData pd;
1020  unsigned int desc_len = avio_rl32(pb);
1021 
1022  if (desc_len > pb->buf_end - pb->buf_ptr)
1023  goto error;
1024 
1025  ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1026  avio_skip(pb, desc_len - ret);
1027  if (*desc)
1028  av_dict_set(&st->metadata, "title", desc, 0);
1029 
1030  avio_rl16(pb); /* flags? */
1031  avio_rl32(pb); /* data size */
1032 
1033  size = pb->buf_end - pb->buf_ptr;
1034  pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1035  .buf_size = size };
1036  if (!pd.buf)
1037  goto error;
1038  memcpy(pd.buf, pb->buf_ptr, size);
1039  sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1040  av_freep(&pd.buf);
1041  if (!sub_demuxer)
1042  goto error;
1043 
1044  if (!(ast->sub_ctx = avformat_alloc_context()))
1045  goto error;
1046 
1047  ast->sub_ctx->pb = pb;
1048 
1049  if (ff_copy_whitelists(ast->sub_ctx, s) < 0)
1050  goto error;
1051 
1052  if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1053  ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1054  *st->codec = *ast->sub_ctx->streams[0]->codec;
1055  ast->sub_ctx->streams[0]->codec->extradata = NULL;
1056  time_base = ast->sub_ctx->streams[0]->time_base;
1057  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1058  }
1059  ast->sub_buffer = pkt->data;
1060  memset(pkt, 0, sizeof(*pkt));
1061  return 1;
1062 
1063 error:
1064  av_freep(&ast->sub_ctx);
1065  av_freep(&pb);
1066  }
1067  return 0;
1068 }
1069 
1071  AVPacket *pkt)
1072 {
1073  AVIStream *ast, *next_ast = next_st->priv_data;
1074  int64_t ts, next_ts, ts_min = INT64_MAX;
1075  AVStream *st, *sub_st = NULL;
1076  int i;
1077 
1078  next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1079  AV_TIME_BASE_Q);
1080 
1081  for (i = 0; i < s->nb_streams; i++) {
1082  st = s->streams[i];
1083  ast = st->priv_data;
1084  if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1085  ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1086  if (ts <= next_ts && ts < ts_min) {
1087  ts_min = ts;
1088  sub_st = st;
1089  }
1090  }
1091  }
1092 
1093  if (sub_st) {
1094  ast = sub_st->priv_data;
1095  *pkt = ast->sub_pkt;
1096  pkt->stream_index = sub_st->index;
1097 
1098  if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1099  ast->sub_pkt.data = NULL;
1100  }
1101  return sub_st;
1102 }
1103 
1104 static int get_stream_idx(const unsigned *d)
1105 {
1106  if (d[0] >= '0' && d[0] <= '9' &&
1107  d[1] >= '0' && d[1] <= '9') {
1108  return (d[0] - '0') * 10 + (d[1] - '0');
1109  } else {
1110  return 100; // invalid stream ID
1111  }
1112 }
1113 
1114 /**
1115  *
1116  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1117  */
1118 static int avi_sync(AVFormatContext *s, int exit_early)
1119 {
1120  AVIContext *avi = s->priv_data;
1121  AVIOContext *pb = s->pb;
1122  int n;
1123  unsigned int d[8];
1124  unsigned int size;
1125  int64_t i, sync;
1126 
1127 start_sync:
1128  memset(d, -1, sizeof(d));
1129  for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1130  int j;
1131 
1132  for (j = 0; j < 7; j++)
1133  d[j] = d[j + 1];
1134  d[7] = avio_r8(pb);
1135 
1136  size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1137 
1138  n = get_stream_idx(d + 2);
1139  av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1140  d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1141  if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1142  continue;
1143 
1144  // parse ix##
1145  if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1146  // parse JUNK
1147  (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1148  (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1149  avio_skip(pb, size);
1150  goto start_sync;
1151  }
1152 
1153  // parse stray LIST
1154  if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1155  avio_skip(pb, 4);
1156  goto start_sync;
1157  }
1158 
1159  n = get_stream_idx(d);
1160 
1161  if (!((i - avi->last_pkt_pos) & 1) &&
1162  get_stream_idx(d + 1) < s->nb_streams)
1163  continue;
1164 
1165  // detect ##ix chunk and skip
1166  if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1167  avio_skip(pb, size);
1168  goto start_sync;
1169  }
1170 
1171  if (avi->dv_demux && n != 0)
1172  continue;
1173 
1174  // parse ##dc/##wb
1175  if (n < s->nb_streams) {
1176  AVStream *st;
1177  AVIStream *ast;
1178  st = s->streams[n];
1179  ast = st->priv_data;
1180 
1181  if (!ast) {
1182  av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1183  continue;
1184  }
1185 
1186  if (s->nb_streams >= 2) {
1187  AVStream *st1 = s->streams[1];
1188  AVIStream *ast1 = st1->priv_data;
1189  // workaround for broken small-file-bug402.avi
1190  if ( d[2] == 'w' && d[3] == 'b'
1191  && n == 0
1192  && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1193  && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1194  && ast->prefix == 'd'*256+'c'
1195  && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1196  ) {
1197  n = 1;
1198  st = st1;
1199  ast = ast1;
1201  "Invalid stream + prefix combination, assuming audio.\n");
1202  }
1203  }
1204 
1205  if (!avi->dv_demux &&
1206  ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1207  // FIXME: needs a little reordering
1208  (st->discard >= AVDISCARD_NONKEY &&
1209  !(pkt->flags & AV_PKT_FLAG_KEY)) */
1210  || st->discard >= AVDISCARD_ALL)) {
1211  if (!exit_early) {
1212  ast->frame_offset += get_duration(ast, size);
1213  avio_skip(pb, size);
1214  goto start_sync;
1215  }
1216  }
1217 
1218  if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1219  int k = avio_r8(pb);
1220  int last = (k + avio_r8(pb) - 1) & 0xFF;
1221 
1222  avio_rl16(pb); // flags
1223 
1224  // b + (g << 8) + (r << 16);
1225  for (; k <= last; k++)
1226  ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1227 
1228  ast->has_pal = 1;
1229  goto start_sync;
1230  } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1231  d[2] < 128 && d[3] < 128) ||
1232  d[2] * 256 + d[3] == ast->prefix /* ||
1233  (d[2] == 'd' && d[3] == 'c') ||
1234  (d[2] == 'w' && d[3] == 'b') */) {
1235  if (exit_early)
1236  return 0;
1237  if (d[2] * 256 + d[3] == ast->prefix)
1238  ast->prefix_count++;
1239  else {
1240  ast->prefix = d[2] * 256 + d[3];
1241  ast->prefix_count = 0;
1242  }
1243 
1244  avi->stream_index = n;
1245  ast->packet_size = size + 8;
1246  ast->remaining = size;
1247 
1248  if (size) {
1249  uint64_t pos = avio_tell(pb) - 8;
1250  if (!st->index_entries || !st->nb_index_entries ||
1251  st->index_entries[st->nb_index_entries - 1].pos < pos) {
1252  av_add_index_entry(st, pos, ast->frame_offset, size,
1253  0, AVINDEX_KEYFRAME);
1254  }
1255  }
1256  return 0;
1257  }
1258  }
1259  }
1260 
1261  if (pb->error)
1262  return pb->error;
1263  return AVERROR_EOF;
1264 }
1265 
1267 {
1268  AVIContext *avi = s->priv_data;
1269  AVIOContext *pb = s->pb;
1270  int err;
1271 #if FF_API_DESTRUCT_PACKET
1272  void *dstr;
1273 #endif
1274 
1275  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1276  int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1277  if (size >= 0)
1278  return size;
1279  else
1280  goto resync;
1281  }
1282 
1283  if (avi->non_interleaved) {
1284  int best_stream_index = 0;
1285  AVStream *best_st = NULL;
1286  AVIStream *best_ast;
1287  int64_t best_ts = INT64_MAX;
1288  int i;
1289 
1290  for (i = 0; i < s->nb_streams; i++) {
1291  AVStream *st = s->streams[i];
1292  AVIStream *ast = st->priv_data;
1293  int64_t ts = ast->frame_offset;
1294  int64_t last_ts;
1295 
1296  if (!st->nb_index_entries)
1297  continue;
1298 
1299  last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1300  if (!ast->remaining && ts > last_ts)
1301  continue;
1302 
1303  ts = av_rescale_q(ts, st->time_base,
1304  (AVRational) { FFMAX(1, ast->sample_size),
1305  AV_TIME_BASE });
1306 
1307  av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1308  st->time_base.num, st->time_base.den, ast->frame_offset);
1309  if (ts < best_ts) {
1310  best_ts = ts;
1311  best_st = st;
1312  best_stream_index = i;
1313  }
1314  }
1315  if (!best_st)
1316  return AVERROR_EOF;
1317 
1318  best_ast = best_st->priv_data;
1319  best_ts = best_ast->frame_offset;
1320  if (best_ast->remaining) {
1321  i = av_index_search_timestamp(best_st,
1322  best_ts,
1323  AVSEEK_FLAG_ANY |
1325  } else {
1326  i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1327  if (i >= 0)
1328  best_ast->frame_offset = best_st->index_entries[i].timestamp;
1329  }
1330 
1331  if (i >= 0) {
1332  int64_t pos = best_st->index_entries[i].pos;
1333  pos += best_ast->packet_size - best_ast->remaining;
1334  if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1335  return AVERROR_EOF;
1336 
1337  av_assert0(best_ast->remaining <= best_ast->packet_size);
1338 
1339  avi->stream_index = best_stream_index;
1340  if (!best_ast->remaining)
1341  best_ast->packet_size =
1342  best_ast->remaining = best_st->index_entries[i].size;
1343  }
1344  else
1345  return AVERROR_EOF;
1346  }
1347 
1348 resync:
1349  if (avi->stream_index >= 0) {
1350  AVStream *st = s->streams[avi->stream_index];
1351  AVIStream *ast = st->priv_data;
1352  int size, err;
1353 
1354  if (get_subtitle_pkt(s, st, pkt))
1355  return 0;
1356 
1357  // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1358  if (ast->sample_size <= 1)
1359  size = INT_MAX;
1360  else if (ast->sample_size < 32)
1361  // arbitrary multiplier to avoid tiny packets for raw PCM data
1362  size = 1024 * ast->sample_size;
1363  else
1364  size = ast->sample_size;
1365 
1366  if (size > ast->remaining)
1367  size = ast->remaining;
1368  avi->last_pkt_pos = avio_tell(pb);
1369  err = av_get_packet(pb, pkt, size);
1370  if (err < 0)
1371  return err;
1372  size = err;
1373 
1374  if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1375  uint8_t *pal;
1378  AVPALETTE_SIZE);
1379  if (!pal) {
1381  "Failed to allocate data for palette\n");
1382  } else {
1383  memcpy(pal, ast->pal, AVPALETTE_SIZE);
1384  ast->has_pal = 0;
1385  }
1386  }
1387 
1388  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1389  AVBufferRef *avbuf = pkt->buf;
1390 #if FF_API_DESTRUCT_PACKET
1392  dstr = pkt->destruct;
1394 #endif
1395  size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1396  pkt->data, pkt->size, pkt->pos);
1397 #if FF_API_DESTRUCT_PACKET
1399  pkt->destruct = dstr;
1401 #endif
1402  pkt->buf = avbuf;
1404  if (size < 0)
1406  } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1407  !st->codec->codec_tag && read_gab2_sub(s, st, pkt)) {
1408  ast->frame_offset++;
1409  avi->stream_index = -1;
1410  ast->remaining = 0;
1411  goto resync;
1412  } else {
1413  /* XXX: How to handle B-frames in AVI? */
1414  pkt->dts = ast->frame_offset;
1415 // pkt->dts += ast->start;
1416  if (ast->sample_size)
1417  pkt->dts /= ast->sample_size;
1418  av_dlog(s,
1419  "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1420  "base:%d st:%d size:%d\n",
1421  pkt->dts,
1422  ast->frame_offset,
1423  ast->scale,
1424  ast->rate,
1425  ast->sample_size,
1426  AV_TIME_BASE,
1427  avi->stream_index,
1428  size);
1429  pkt->stream_index = avi->stream_index;
1430 
1431  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1432  AVIndexEntry *e;
1433  int index;
1434 
1436  e = &st->index_entries[index];
1437 
1438  if (index >= 0 && e->timestamp == ast->frame_offset) {
1439  if (index == st->nb_index_entries-1) {
1440  int key=1;
1441  int i;
1442  uint32_t state=-1;
1443  for (i=0; i<FFMIN(size,256); i++) {
1444  if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1445  if (state == 0x1B6) {
1446  key= !(pkt->data[i]&0xC0);
1447  break;
1448  }
1449  }else
1450  break;
1451  state= (state<<8) + pkt->data[i];
1452  }
1453  if (!key)
1454  e->flags &= ~AVINDEX_KEYFRAME;
1455  }
1456  if (e->flags & AVINDEX_KEYFRAME)
1458  }
1459  } else {
1461  }
1462  ast->frame_offset += get_duration(ast, pkt->size);
1463  }
1464  ast->remaining -= err;
1465  if (!ast->remaining) {
1466  avi->stream_index = -1;
1467  ast->packet_size = 0;
1468  }
1469 
1470  if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1472  goto resync;
1473  }
1474  ast->seek_pos= 0;
1475 
1476  if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1477  int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1478 
1479  if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1480  avi->non_interleaved= 1;
1481  av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1482  }else if (avi->dts_max < dts)
1483  avi->dts_max = dts;
1484  }
1485 
1486  return 0;
1487  }
1488 
1489  if ((err = avi_sync(s, 0)) < 0)
1490  return err;
1491  goto resync;
1492 }
1493 
1494 /* XXX: We make the implicit supposition that the positions are sorted
1495  * for each stream. */
1496 static int avi_read_idx1(AVFormatContext *s, int size)
1497 {
1498  AVIContext *avi = s->priv_data;
1499  AVIOContext *pb = s->pb;
1500  int nb_index_entries, i;
1501  AVStream *st;
1502  AVIStream *ast;
1503  unsigned int index, tag, flags, pos, len, first_packet = 1;
1504  unsigned last_pos = -1;
1505  unsigned last_idx = -1;
1506  int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1507  int anykey = 0;
1508 
1509  nb_index_entries = size / 16;
1510  if (nb_index_entries <= 0)
1511  return AVERROR_INVALIDDATA;
1512 
1513  idx1_pos = avio_tell(pb);
1514  avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1515  if (avi_sync(s, 1) == 0)
1516  first_packet_pos = avio_tell(pb) - 8;
1517  avi->stream_index = -1;
1518  avio_seek(pb, idx1_pos, SEEK_SET);
1519 
1520  if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1521  first_packet_pos = 0;
1522  data_offset = avi->movi_list;
1523  }
1524 
1525  /* Read the entries and sort them in each stream component. */
1526  for (i = 0; i < nb_index_entries; i++) {
1527  if (avio_feof(pb))
1528  return -1;
1529 
1530  tag = avio_rl32(pb);
1531  flags = avio_rl32(pb);
1532  pos = avio_rl32(pb);
1533  len = avio_rl32(pb);
1534  av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1535  i, tag, flags, pos, len);
1536 
1537  index = ((tag & 0xff) - '0') * 10;
1538  index += (tag >> 8 & 0xff) - '0';
1539  if (index >= s->nb_streams)
1540  continue;
1541  st = s->streams[index];
1542  ast = st->priv_data;
1543 
1544  if (first_packet && first_packet_pos) {
1545  data_offset = first_packet_pos - pos;
1546  first_packet = 0;
1547  }
1548  pos += data_offset;
1549 
1550  av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1551 
1552  // even if we have only a single stream, we should
1553  // switch to non-interleaved to get correct timestamps
1554  if (last_pos == pos)
1555  avi->non_interleaved = 1;
1556  if (last_idx != pos && len) {
1557  av_add_index_entry(st, pos, ast->cum_len, len, 0,
1558  (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1559  last_idx= pos;
1560  }
1561  ast->cum_len += get_duration(ast, len);
1562  last_pos = pos;
1563  anykey |= flags&AVIIF_INDEX;
1564  }
1565  if (!anykey) {
1566  for (index = 0; index < s->nb_streams; index++) {
1567  st = s->streams[index];
1568  if (st->nb_index_entries)
1570  }
1571  }
1572  return 0;
1573 }
1574 
1575 /* Scan the index and consider any file with streams more than
1576  * 2 seconds or 64MB apart non-interleaved. */
1578 {
1579  int64_t min_pos, pos;
1580  int i;
1581  int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1582  if (!idx)
1583  return AVERROR(ENOMEM);
1584  for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1585  int64_t max_dts = INT64_MIN / 2;
1586  int64_t min_dts = INT64_MAX / 2;
1587  int64_t max_buffer = 0;
1588 
1589  min_pos = INT64_MAX;
1590 
1591  for (i = 0; i < s->nb_streams; i++) {
1592  AVStream *st = s->streams[i];
1593  AVIStream *ast = st->priv_data;
1594  int n = st->nb_index_entries;
1595  while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1596  idx[i]++;
1597  if (idx[i] < n) {
1598  int64_t dts;
1599  dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1600  FFMAX(ast->sample_size, 1),
1601  st->time_base, AV_TIME_BASE_Q);
1602  min_dts = FFMIN(min_dts, dts);
1603  min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1604  }
1605  }
1606  for (i = 0; i < s->nb_streams; i++) {
1607  AVStream *st = s->streams[i];
1608  AVIStream *ast = st->priv_data;
1609 
1610  if (idx[i] && min_dts != INT64_MAX / 2) {
1611  int64_t dts;
1612  dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1613  FFMAX(ast->sample_size, 1),
1614  st->time_base, AV_TIME_BASE_Q);
1615  max_dts = FFMAX(max_dts, dts);
1616  max_buffer = FFMAX(max_buffer,
1617  av_rescale(dts - min_dts,
1618  st->codec->bit_rate,
1619  AV_TIME_BASE));
1620  }
1621  }
1622  if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1623  max_buffer > 1024 * 1024 * 8 * 8) {
1624  av_free(idx);
1625  return 1;
1626  }
1627  }
1628  av_free(idx);
1629  return 0;
1630 }
1631 
1633 {
1634  int i;
1635  int64_t last_start = 0;
1636  int64_t first_end = INT64_MAX;
1637  int64_t oldpos = avio_tell(s->pb);
1638 
1639  for (i = 0; i < s->nb_streams; i++) {
1640  AVStream *st = s->streams[i];
1641  int n = st->nb_index_entries;
1642  unsigned int size;
1643 
1644  if (n <= 0)
1645  continue;
1646 
1647  if (n >= 2) {
1648  int64_t pos = st->index_entries[0].pos;
1649  avio_seek(s->pb, pos + 4, SEEK_SET);
1650  size = avio_rl32(s->pb);
1651  if (pos + size > st->index_entries[1].pos)
1652  last_start = INT64_MAX;
1653  }
1654 
1655  if (st->index_entries[0].pos > last_start)
1656  last_start = st->index_entries[0].pos;
1657  if (st->index_entries[n - 1].pos < first_end)
1658  first_end = st->index_entries[n - 1].pos;
1659  }
1660  avio_seek(s->pb, oldpos, SEEK_SET);
1661 
1662  if (last_start > first_end)
1663  return 1;
1664 
1665  return check_stream_max_drift(s);
1666 }
1667 
1669 {
1670  AVIContext *avi = s->priv_data;
1671  AVIOContext *pb = s->pb;
1672  uint32_t tag, size;
1673  int64_t pos = avio_tell(pb);
1674  int64_t next;
1675  int ret = -1;
1676 
1677  if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1678  goto the_end; // maybe truncated file
1679  av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1680  for (;;) {
1681  tag = avio_rl32(pb);
1682  size = avio_rl32(pb);
1683  if (avio_feof(pb))
1684  break;
1685  next = avio_tell(pb) + size + (size & 1);
1686 
1687  av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1688  tag & 0xff,
1689  (tag >> 8) & 0xff,
1690  (tag >> 16) & 0xff,
1691  (tag >> 24) & 0xff,
1692  size);
1693 
1694  if (tag == MKTAG('i', 'd', 'x', '1') &&
1695  avi_read_idx1(s, size) >= 0) {
1696  avi->index_loaded=2;
1697  ret = 0;
1698  }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1699  uint32_t tag1 = avio_rl32(pb);
1700 
1701  if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1702  ff_read_riff_info(s, size - 4);
1703  }else if (!ret)
1704  break;
1705 
1706  if (avio_seek(pb, next, SEEK_SET) < 0)
1707  break; // something is wrong here
1708  }
1709 
1710 the_end:
1711  avio_seek(pb, pos, SEEK_SET);
1712  return ret;
1713 }
1714 
1715 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1716 {
1717  AVIStream *ast2 = st2->priv_data;
1718  int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1719  av_free_packet(&ast2->sub_pkt);
1720  if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1721  avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1722  ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1723 }
1724 
1725 static int avi_read_seek(AVFormatContext *s, int stream_index,
1726  int64_t timestamp, int flags)
1727 {
1728  AVIContext *avi = s->priv_data;
1729  AVStream *st;
1730  int i, index;
1731  int64_t pos, pos_min;
1732  AVIStream *ast;
1733 
1734  /* Does not matter which stream is requested dv in avi has the
1735  * stream information in the first video stream.
1736  */
1737  if (avi->dv_demux)
1738  stream_index = 0;
1739 
1740  if (!avi->index_loaded) {
1741  /* we only load the index on demand */
1742  avi_load_index(s);
1743  avi->index_loaded |= 1;
1744  }
1745  av_assert0(stream_index >= 0);
1746 
1747  st = s->streams[stream_index];
1748  ast = st->priv_data;
1749  index = av_index_search_timestamp(st,
1750  timestamp * FFMAX(ast->sample_size, 1),
1751  flags);
1752  if (index < 0) {
1753  if (st->nb_index_entries > 0)
1754  av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1755  timestamp * FFMAX(ast->sample_size, 1),
1756  st->index_entries[0].timestamp,
1758  return AVERROR_INVALIDDATA;
1759  }
1760 
1761  /* find the position */
1762  pos = st->index_entries[index].pos;
1763  timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1764 
1765  av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1766  timestamp, index, st->index_entries[index].timestamp);
1767 
1768  if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1769  /* One and only one real stream for DV in AVI, and it has video */
1770  /* offsets. Calling with other stream indexes should have failed */
1771  /* the av_index_search_timestamp call above. */
1772 
1773  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1774  return -1;
1775 
1776  /* Feed the DV video stream version of the timestamp to the */
1777  /* DV demux so it can synthesize correct timestamps. */
1778  ff_dv_offset_reset(avi->dv_demux, timestamp);
1779 
1780  avi->stream_index = -1;
1781  return 0;
1782  }
1783 
1784  pos_min = pos;
1785  for (i = 0; i < s->nb_streams; i++) {
1786  AVStream *st2 = s->streams[i];
1787  AVIStream *ast2 = st2->priv_data;
1788 
1789  ast2->packet_size =
1790  ast2->remaining = 0;
1791 
1792  if (ast2->sub_ctx) {
1793  seek_subtitle(st, st2, timestamp);
1794  continue;
1795  }
1796 
1797  if (st2->nb_index_entries <= 0)
1798  continue;
1799 
1800 // av_assert1(st2->codec->block_align);
1801  av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
1802  index = av_index_search_timestamp(st2,
1803  av_rescale_q(timestamp,
1804  st->time_base,
1805  st2->time_base) *
1806  FFMAX(ast2->sample_size, 1),
1807  flags |
1810  if (index < 0)
1811  index = 0;
1812  ast2->seek_pos = st2->index_entries[index].pos;
1813  pos_min = FFMIN(pos_min,ast2->seek_pos);
1814  }
1815  for (i = 0; i < s->nb_streams; i++) {
1816  AVStream *st2 = s->streams[i];
1817  AVIStream *ast2 = st2->priv_data;
1818 
1819  if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1820  continue;
1821 
1822  index = av_index_search_timestamp(
1823  st2,
1824  av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1826  if (index < 0)
1827  index = 0;
1828  while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1829  index--;
1830  ast2->frame_offset = st2->index_entries[index].timestamp;
1831  }
1832 
1833  /* do the seek */
1834  if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1835  av_log(s, AV_LOG_ERROR, "Seek failed\n");
1836  return -1;
1837  }
1838  avi->stream_index = -1;
1839  avi->dts_max = INT_MIN;
1840  return 0;
1841 }
1842 
1844 {
1845  int i;
1846  AVIContext *avi = s->priv_data;
1847 
1848  for (i = 0; i < s->nb_streams; i++) {
1849  AVStream *st = s->streams[i];
1850  AVIStream *ast = st->priv_data;
1851  if (ast) {
1852  if (ast->sub_ctx) {
1853  av_freep(&ast->sub_ctx->pb);
1855  }
1856  av_freep(&ast->sub_buffer);
1857  av_free_packet(&ast->sub_pkt);
1858  }
1859  }
1860 
1861  av_freep(&avi->dv_demux);
1862 
1863  return 0;
1864 }
1865 
1866 static int avi_probe(AVProbeData *p)
1867 {
1868  int i;
1869 
1870  /* check file header */
1871  for (i = 0; avi_headers[i][0]; i++)
1872  if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1873  AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1874  return AVPROBE_SCORE_MAX;
1875 
1876  return 0;
1877 }
1878 
1880  .name = "avi",
1881  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1882  .priv_data_size = sizeof(AVIContext),
1883  .extensions = "avi",
1884  .read_probe = avi_probe,
1889  .priv_class = &demuxer_class,
1890 };