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mov.c
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1 /*
2  * MOV demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <limits.h>
24 
25 //#define DEBUG
26 //#define MOV_EXPORT_ALL_METADATA
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/intfloat.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/timecode.h"
37 #include "libavcodec/ac3tab.h"
38 #include "avformat.h"
39 #include "internal.h"
40 #include "avio_internal.h"
41 #include "riff.h"
42 #include "isom.h"
43 #include "libavcodec/get_bits.h"
44 #include "id3v1.h"
45 #include "mov_chan.h"
46 
47 #if CONFIG_ZLIB
48 #include <zlib.h>
49 #endif
50 
51 /*
52  * First version by Francois Revol revol@free.fr
53  * Seek function by Gael Chardon gael.dev@4now.net
54  */
55 
56 #include "qtpalette.h"
57 
58 
59 #undef NDEBUG
60 #include <assert.h>
61 
62 /* those functions parse an atom */
63 /* links atom IDs to parse functions */
64 typedef struct MOVParseTableEntry {
65  uint32_t type;
66  int (*parse)(MOVContext *ctx, AVIOContext *pb, MOVAtom atom);
67 } MOVParseTableEntry;
68 
69 static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom);
70 
71 static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
72  unsigned len, const char *key)
73 {
74  char buf[16];
75 
76  short current, total = 0;
77  avio_rb16(pb); // unknown
78  current = avio_rb16(pb);
79  if (len >= 6)
80  total = avio_rb16(pb);
81  if (!total)
82  snprintf(buf, sizeof(buf), "%d", current);
83  else
84  snprintf(buf, sizeof(buf), "%d/%d", current, total);
85  av_dict_set(&c->fc->metadata, key, buf, 0);
86 
87  return 0;
88 }
89 
90 static int mov_metadata_int8_bypass_padding(MOVContext *c, AVIOContext *pb,
91  unsigned len, const char *key)
92 {
93  char buf[16];
94 
95  /* bypass padding bytes */
96  avio_r8(pb);
97  avio_r8(pb);
98  avio_r8(pb);
99 
100  snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
101  av_dict_set(&c->fc->metadata, key, buf, 0);
102 
103  return 0;
104 }
105 
106 static int mov_metadata_int8_no_padding(MOVContext *c, AVIOContext *pb,
107  unsigned len, const char *key)
108 {
109  char buf[16];
110 
111  snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
112  av_dict_set(&c->fc->metadata, key, buf, 0);
113 
114  return 0;
115 }
116 
117 static int mov_metadata_gnre(MOVContext *c, AVIOContext *pb,
118  unsigned len, const char *key)
119 {
120  short genre;
121  char buf[20];
122 
123  avio_r8(pb); // unknown
124 
125  genre = avio_r8(pb);
126  if (genre < 1 || genre > ID3v1_GENRE_MAX)
127  return 0;
128  snprintf(buf, sizeof(buf), "%s", ff_id3v1_genre_str[genre-1]);
129  av_dict_set(&c->fc->metadata, key, buf, 0);
130 
131  return 0;
132 }
133 
134 static int mov_read_custom_metadata(MOVContext *c, AVIOContext *pb, MOVAtom atom)
135 {
136  char key[1024]={0}, data[1024]={0};
137  int i;
138  AVStream *st;
139  MOVStreamContext *sc;
140 
141  if (c->fc->nb_streams < 1)
142  return 0;
143  st = c->fc->streams[c->fc->nb_streams-1];
144  sc = st->priv_data;
145 
146  if (atom.size <= 8) return 0;
147 
148  for (i = 0; i < 3; i++) { // Parse up to three sub-atoms looking for name and data.
149  int data_size = avio_rb32(pb);
150  int tag = avio_rl32(pb);
151  int str_size = 0, skip_size = 0;
152  char *target = NULL;
153 
154  switch (tag) {
155  case MKTAG('n','a','m','e'):
156  avio_rb32(pb); // version/flags
157  str_size = skip_size = data_size - 12;
158  atom.size -= 12;
159  target = key;
160  break;
161  case MKTAG('d','a','t','a'):
162  avio_rb32(pb); // version/flags
163  avio_rb32(pb); // reserved (zero)
164  str_size = skip_size = data_size - 16;
165  atom.size -= 16;
166  target = data;
167  break;
168  default:
169  skip_size = data_size - 8;
170  str_size = 0;
171  break;
172  }
173 
174  if (target) {
175  str_size = FFMIN3(sizeof(data)-1, str_size, atom.size);
176  avio_read(pb, target, str_size);
177  target[str_size] = 0;
178  }
179  atom.size -= skip_size;
180 
181  // If we didn't read the full data chunk for the sub-atom, skip to the end of it.
182  if (skip_size > str_size) avio_skip(pb, skip_size - str_size);
183  }
184 
185  if (*key && *data) {
186  if (strcmp(key, "iTunSMPB") == 0) {
187  int priming, remainder, samples;
188  if(sscanf(data, "%*X %X %X %X", &priming, &remainder, &samples) == 3){
189  if(priming>0 && priming<16384)
190  sc->start_pad = priming;
191  return 1;
192  }
193  }
194  if (strcmp(key, "cdec") == 0) {
195 // av_dict_set(&st->metadata, key, data, 0);
196  return 1;
197  }
198  }
199  return 0;
200 }
201 
202 static const uint32_t mac_to_unicode[128] = {
203  0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,
204  0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,
205  0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,
206  0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,
207  0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,
208  0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,
209  0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,
210  0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,
211  0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,
212  0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,
213  0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,
214  0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,
215  0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,
216  0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,
217  0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,
218  0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,
219 };
220 
221 static int mov_read_mac_string(MOVContext *c, AVIOContext *pb, int len,
222  char *dst, int dstlen)
223 {
224  char *p = dst;
225  char *end = dst+dstlen-1;
226  int i;
227 
228  for (i = 0; i < len; i++) {
229  uint8_t t, c = avio_r8(pb);
230  if (c < 0x80 && p < end)
231  *p++ = c;
232  else if (p < end)
233  PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);
234  }
235  *p = 0;
236  return p - dst;
237 }
238 
239 static int mov_read_covr(MOVContext *c, AVIOContext *pb, int type, int len)
240 {
241  AVPacket pkt;
242  AVStream *st;
243  MOVStreamContext *sc;
244  enum AVCodecID id;
245  int ret;
246 
247  switch (type) {
248  case 0xd: id = AV_CODEC_ID_MJPEG; break;
249  case 0xe: id = AV_CODEC_ID_PNG; break;
250  case 0x1b: id = AV_CODEC_ID_BMP; break;
251  default:
252  av_log(c->fc, AV_LOG_WARNING, "Unknown cover type: 0x%x.\n", type);
253  avio_skip(pb, len);
254  return 0;
255  }
256 
257  st = avformat_new_stream(c->fc, NULL);
258  if (!st)
259  return AVERROR(ENOMEM);
260  sc = av_mallocz(sizeof(*sc));
261  if (!sc)
262  return AVERROR(ENOMEM);
263  st->priv_data = sc;
264 
265  ret = av_get_packet(pb, &pkt, len);
266  if (ret < 0)
267  return ret;
268 
269  st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
270 
271  st->attached_pic = pkt;
272  st->attached_pic.stream_index = st->index;
273  st->attached_pic.flags |= AV_PKT_FLAG_KEY;
274 
275  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
276  st->codec->codec_id = id;
277 
278  return 0;
279 }
280 
281 static int mov_metadata_raw(MOVContext *c, AVIOContext *pb,
282  unsigned len, const char *key)
283 {
284  char *value = av_malloc(len + 1);
285  if (!value)
286  return AVERROR(ENOMEM);
287  avio_read(pb, value, len);
288  value[len] = 0;
289  return av_dict_set(&c->fc->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
290 }
291 
292 static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
293 {
294 #ifdef MOV_EXPORT_ALL_METADATA
295  char tmp_key[5];
296 #endif
297  char str[1024], key2[16], language[4] = {0};
298  const char *key = NULL;
299  uint16_t langcode = 0;
300  uint32_t data_type = 0, str_size;
301  int (*parse)(MOVContext*, AVIOContext*, unsigned, const char*) = NULL;
302 
303  if (c->itunes_metadata && atom.type == MKTAG('-','-','-','-'))
304  return mov_read_custom_metadata(c, pb, atom);
305 
306  switch (atom.type) {
307  case MKTAG(0xa9,'n','a','m'): key = "title"; break;
308  case MKTAG(0xa9,'a','u','t'):
309  case MKTAG(0xa9,'A','R','T'): key = "artist"; break;
310  case MKTAG( 'a','A','R','T'): key = "album_artist"; break;
311  case MKTAG(0xa9,'w','r','t'): key = "composer"; break;
312  case MKTAG( 'c','p','r','t'):
313  case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;
314  case MKTAG(0xa9,'g','r','p'): key = "grouping"; break;
315  case MKTAG(0xa9,'l','y','r'): key = "lyrics"; break;
316  case MKTAG(0xa9,'c','m','t'):
317  case MKTAG(0xa9,'i','n','f'): key = "comment"; break;
318  case MKTAG(0xa9,'a','l','b'): key = "album"; break;
319  case MKTAG(0xa9,'d','a','y'): key = "date"; break;
320  case MKTAG(0xa9,'g','e','n'): key = "genre"; break;
321  case MKTAG( 'g','n','r','e'): key = "genre";
322  parse = mov_metadata_gnre; break;
323  case MKTAG(0xa9,'t','o','o'):
324  case MKTAG(0xa9,'s','w','r'): key = "encoder"; break;
325  case MKTAG(0xa9,'e','n','c'): key = "encoder"; break;
326  case MKTAG(0xa9,'m','a','k'): key = "make"; break;
327  case MKTAG(0xa9,'m','o','d'): key = "model"; break;
328  case MKTAG(0xa9,'x','y','z'): key = "location"; break;
329  case MKTAG( 'd','e','s','c'): key = "description";break;
330  case MKTAG( 'l','d','e','s'): key = "synopsis"; break;
331  case MKTAG( 't','v','s','h'): key = "show"; break;
332  case MKTAG( 't','v','e','n'): key = "episode_id";break;
333  case MKTAG( 't','v','n','n'): key = "network"; break;
334  case MKTAG( 't','r','k','n'): key = "track";
335  parse = mov_metadata_track_or_disc_number; break;
336  case MKTAG( 'd','i','s','k'): key = "disc";
337  parse = mov_metadata_track_or_disc_number; break;
338  case MKTAG( 't','v','e','s'): key = "episode_sort";
339  parse = mov_metadata_int8_bypass_padding; break;
340  case MKTAG( 't','v','s','n'): key = "season_number";
341  parse = mov_metadata_int8_bypass_padding; break;
342  case MKTAG( 's','t','i','k'): key = "media_type";
343  parse = mov_metadata_int8_no_padding; break;
344  case MKTAG( 'h','d','v','d'): key = "hd_video";
345  parse = mov_metadata_int8_no_padding; break;
346  case MKTAG( 'p','g','a','p'): key = "gapless_playback";
347  parse = mov_metadata_int8_no_padding; break;
348  case MKTAG( '@','P','R','M'):
349  return mov_metadata_raw(c, pb, atom.size, "premiere_version");
350  case MKTAG( '@','P','R','Q'):
351  return mov_metadata_raw(c, pb, atom.size, "quicktime_version");
352  }
353 
354  if (c->itunes_metadata && atom.size > 8) {
355  int data_size = avio_rb32(pb);
356  int tag = avio_rl32(pb);
357  if (tag == MKTAG('d','a','t','a')) {
358  data_type = avio_rb32(pb); // type
359  avio_rb32(pb); // unknown
360  str_size = data_size - 16;
361  atom.size -= 16;
362 
363  if (atom.type == MKTAG('c', 'o', 'v', 'r')) {
364  int ret = mov_read_covr(c, pb, data_type, str_size);
365  if (ret < 0) {
366  av_log(c->fc, AV_LOG_ERROR, "Error parsing cover art.\n");
367  return ret;
368  }
369  }
370  } else return 0;
371  } else if (atom.size > 4 && key && !c->itunes_metadata) {
372  str_size = avio_rb16(pb); // string length
373  langcode = avio_rb16(pb);
374  ff_mov_lang_to_iso639(langcode, language);
375  atom.size -= 4;
376  } else
377  str_size = atom.size;
378 
379 #ifdef MOV_EXPORT_ALL_METADATA
380  if (!key) {
381  snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);
382  key = tmp_key;
383  }
384 #endif
385 
386  if (!key)
387  return 0;
388  if (atom.size < 0)
389  return AVERROR_INVALIDDATA;
390 
391  str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);
392 
393  if (parse)
394  parse(c, pb, str_size, key);
395  else {
396  if (data_type == 3 || (data_type == 0 && (langcode < 0x400 || langcode == 0x7fff))) { // MAC Encoded
397  mov_read_mac_string(c, pb, str_size, str, sizeof(str));
398  } else {
399  avio_read(pb, str, str_size);
400  str[str_size] = 0;
401  }
402  av_dict_set(&c->fc->metadata, key, str, 0);
403  if (*language && strcmp(language, "und")) {
404  snprintf(key2, sizeof(key2), "%s-%s", key, language);
405  av_dict_set(&c->fc->metadata, key2, str, 0);
406  }
407  }
408  av_dlog(c->fc, "lang \"%3s\" ", language);
409  av_dlog(c->fc, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %"PRId64"\n",
410  key, str, (char*)&atom.type, str_size, atom.size);
411 
412  return 0;
413 }
414 
415 static int mov_read_chpl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
416 {
417  int64_t start;
418  int i, nb_chapters, str_len, version;
419  char str[256+1];
420 
421  if ((atom.size -= 5) < 0)
422  return 0;
423 
424  version = avio_r8(pb);
425  avio_rb24(pb);
426  if (version)
427  avio_rb32(pb); // ???
428  nb_chapters = avio_r8(pb);
429 
430  for (i = 0; i < nb_chapters; i++) {
431  if (atom.size < 9)
432  return 0;
433 
434  start = avio_rb64(pb);
435  str_len = avio_r8(pb);
436 
437  if ((atom.size -= 9+str_len) < 0)
438  return 0;
439 
440  avio_read(pb, str, str_len);
441  str[str_len] = 0;
442  avpriv_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);
443  }
444  return 0;
445 }
446 
447 #define MIN_DATA_ENTRY_BOX_SIZE 12
448 static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
449 {
450  AVStream *st;
451  MOVStreamContext *sc;
452  int entries, i, j;
453 
454  if (c->fc->nb_streams < 1)
455  return 0;
456  st = c->fc->streams[c->fc->nb_streams-1];
457  sc = st->priv_data;
458 
459  avio_rb32(pb); // version + flags
460  entries = avio_rb32(pb);
461  if (entries > (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||
462  entries >= UINT_MAX / sizeof(*sc->drefs))
463  return AVERROR_INVALIDDATA;
464  av_free(sc->drefs);
465  sc->drefs_count = 0;
466  sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
467  if (!sc->drefs)
468  return AVERROR(ENOMEM);
469  sc->drefs_count = entries;
470 
471  for (i = 0; i < sc->drefs_count; i++) {
472  MOVDref *dref = &sc->drefs[i];
473  uint32_t size = avio_rb32(pb);
474  int64_t next = avio_tell(pb) + size - 4;
475 
476  if (size < 12)
477  return AVERROR_INVALIDDATA;
478 
479  dref->type = avio_rl32(pb);
480  avio_rb32(pb); // version + flags
481  av_dlog(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);
482 
483  if (dref->type == MKTAG('a','l','i','s') && size > 150) {
484  /* macintosh alias record */
485  uint16_t volume_len, len;
486  int16_t type;
487 
488  avio_skip(pb, 10);
489 
490  volume_len = avio_r8(pb);
491  volume_len = FFMIN(volume_len, 27);
492  avio_read(pb, dref->volume, 27);
493  dref->volume[volume_len] = 0;
494  av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);
495 
496  avio_skip(pb, 12);
497 
498  len = avio_r8(pb);
499  len = FFMIN(len, 63);
500  avio_read(pb, dref->filename, 63);
501  dref->filename[len] = 0;
502  av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);
503 
504  avio_skip(pb, 16);
505 
506  /* read next level up_from_alias/down_to_target */
507  dref->nlvl_from = avio_rb16(pb);
508  dref->nlvl_to = avio_rb16(pb);
509  av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
510  dref->nlvl_from, dref->nlvl_to);
511 
512  avio_skip(pb, 16);
513 
514  for (type = 0; type != -1 && avio_tell(pb) < next; ) {
515  if(url_feof(pb))
516  return AVERROR_EOF;
517  type = avio_rb16(pb);
518  len = avio_rb16(pb);
519  av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
520  if (len&1)
521  len += 1;
522  if (type == 2) { // absolute path
523  av_free(dref->path);
524  dref->path = av_mallocz(len+1);
525  if (!dref->path)
526  return AVERROR(ENOMEM);
527  avio_read(pb, dref->path, len);
528  if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
529  len -= volume_len;
530  memmove(dref->path, dref->path+volume_len, len);
531  dref->path[len] = 0;
532  }
533  for (j = 0; j < len; j++)
534  if (dref->path[j] == ':')
535  dref->path[j] = '/';
536  av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
537  } else if (type == 0) { // directory name
538  av_free(dref->dir);
539  dref->dir = av_malloc(len+1);
540  if (!dref->dir)
541  return AVERROR(ENOMEM);
542  avio_read(pb, dref->dir, len);
543  dref->dir[len] = 0;
544  for (j = 0; j < len; j++)
545  if (dref->dir[j] == ':')
546  dref->dir[j] = '/';
547  av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
548  } else
549  avio_skip(pb, len);
550  }
551  }
552  avio_seek(pb, next, SEEK_SET);
553  }
554  return 0;
555 }
556 
557 static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
558 {
559  AVStream *st;
560  uint32_t type;
561  uint32_t av_unused ctype;
562  int title_size;
563  char *title_str;
564 
565  if (c->fc->nb_streams < 1) // meta before first trak
566  return 0;
567 
568  st = c->fc->streams[c->fc->nb_streams-1];
569 
570  avio_r8(pb); /* version */
571  avio_rb24(pb); /* flags */
572 
573  /* component type */
574  ctype = avio_rl32(pb);
575  type = avio_rl32(pb); /* component subtype */
576 
577  av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
578  av_dlog(c->fc, "stype= %.4s\n", (char*)&type);
579 
580  if (type == MKTAG('v','i','d','e'))
581  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
582  else if (type == MKTAG('s','o','u','n'))
583  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
584  else if (type == MKTAG('m','1','a',' '))
585  st->codec->codec_id = AV_CODEC_ID_MP2;
586  else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))
587  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
588 
589  avio_rb32(pb); /* component manufacture */
590  avio_rb32(pb); /* component flags */
591  avio_rb32(pb); /* component flags mask */
592 
593  title_size = atom.size - 24;
594  if (title_size > 0) {
595  title_str = av_malloc(title_size + 1); /* Add null terminator */
596  if (!title_str)
597  return AVERROR(ENOMEM);
598  avio_read(pb, title_str, title_size);
599  title_str[title_size] = 0;
600  if (title_str[0])
601  av_dict_set(&st->metadata, "handler_name", title_str +
602  (!c->isom && title_str[0] == title_size - 1), 0);
603  av_freep(&title_str);
604  }
605 
606  return 0;
607 }
608 
609 int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
610 {
611  AVStream *st;
612  int tag;
613 
614  if (fc->nb_streams < 1)
615  return 0;
616  st = fc->streams[fc->nb_streams-1];
617 
618  avio_rb32(pb); /* version + flags */
619  ff_mp4_read_descr(fc, pb, &tag);
620  if (tag == MP4ESDescrTag) {
621  ff_mp4_parse_es_descr(pb, NULL);
622  } else
623  avio_rb16(pb); /* ID */
624 
625  ff_mp4_read_descr(fc, pb, &tag);
626  if (tag == MP4DecConfigDescrTag)
627  ff_mp4_read_dec_config_descr(fc, st, pb);
628  return 0;
629 }
630 
631 static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)
632 {
633  return ff_mov_read_esds(c->fc, pb, atom);
634 }
635 
636 static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
637 {
638  AVStream *st;
639  int ac3info, acmod, lfeon, bsmod;
640 
641  if (c->fc->nb_streams < 1)
642  return 0;
643  st = c->fc->streams[c->fc->nb_streams-1];
644 
645  ac3info = avio_rb24(pb);
646  bsmod = (ac3info >> 14) & 0x7;
647  acmod = (ac3info >> 11) & 0x7;
648  lfeon = (ac3info >> 10) & 0x1;
649  st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
650  st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
651  if (lfeon)
652  st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
653  st->codec->audio_service_type = bsmod;
654  if (st->codec->channels > 1 && bsmod == 0x7)
655  st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
656 
657  return 0;
658 }
659 
660 static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
661 {
662  AVStream *st;
663  int eac3info, acmod, lfeon, bsmod;
664 
665  if (c->fc->nb_streams < 1)
666  return 0;
667  st = c->fc->streams[c->fc->nb_streams-1];
668 
669  /* No need to parse fields for additional independent substreams and its
670  * associated dependent substreams since libavcodec's E-AC-3 decoder
671  * does not support them yet. */
672  avio_rb16(pb); /* data_rate and num_ind_sub */
673  eac3info = avio_rb24(pb);
674  bsmod = (eac3info >> 12) & 0x1f;
675  acmod = (eac3info >> 9) & 0x7;
676  lfeon = (eac3info >> 8) & 0x1;
677  st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
678  if (lfeon)
679  st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
680  st->codec->channels = av_get_channel_layout_nb_channels(st->codec->channel_layout);
681  st->codec->audio_service_type = bsmod;
682  if (st->codec->channels > 1 && bsmod == 0x7)
683  st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
684 
685  return 0;
686 }
687 
688 static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
689 {
690  AVStream *st;
691 
692  if (c->fc->nb_streams < 1)
693  return 0;
694  st = c->fc->streams[c->fc->nb_streams-1];
695 
696  if (atom.size < 16)
697  return 0;
698 
699  /* skip version and flags */
700  avio_skip(pb, 4);
701 
702  ff_mov_read_chan(c->fc, pb, st, atom.size - 4);
703 
704  return 0;
705 }
706 
707 static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
708 {
709  AVStream *st;
710 
711  if (c->fc->nb_streams < 1)
712  return 0;
713  st = c->fc->streams[c->fc->nb_streams-1];
714 
715  if (ff_get_wav_header(pb, st->codec, atom.size) < 0) {
716  av_log(c->fc, AV_LOG_WARNING, "get_wav_header failed\n");
717  }
718 
719  return 0;
720 }
721 
722 static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
723 {
724  const int num = avio_rb32(pb);
725  const int den = avio_rb32(pb);
726  AVStream *st;
727 
728  if (c->fc->nb_streams < 1)
729  return 0;
730  st = c->fc->streams[c->fc->nb_streams-1];
731 
732  if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default
733  (den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num)) {
734  av_log(c->fc, AV_LOG_WARNING,
735  "sample aspect ratio already set to %d:%d, ignoring 'pasp' atom (%d:%d)\n",
736  st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
737  num, den);
738  } else if (den != 0) {
739  st->sample_aspect_ratio.num = num;
740  st->sample_aspect_ratio.den = den;
741  }
742  return 0;
743 }
744 
745 /* this atom contains actual media data */
746 static int mov_read_mdat(MOVContext *c, AVIOContext *pb, MOVAtom atom)
747 {
748  if (atom.size == 0) /* wrong one (MP4) */
749  return 0;
750  c->found_mdat=1;
751  return 0; /* now go for moov */
752 }
753 
754 /* read major brand, minor version and compatible brands and store them as metadata */
755 static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
756 {
757  uint32_t minor_ver;
758  int comp_brand_size;
759  char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */
760  char* comp_brands_str;
761  uint8_t type[5] = {0};
762 
763  avio_read(pb, type, 4);
764  if (strcmp(type, "qt "))
765  c->isom = 1;
766  av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
767  av_dict_set(&c->fc->metadata, "major_brand", type, 0);
768  minor_ver = avio_rb32(pb); /* minor version */
769  snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);
770  av_dict_set(&c->fc->metadata, "minor_version", minor_ver_str, 0);
771 
772  comp_brand_size = atom.size - 8;
773  if (comp_brand_size < 0)
774  return AVERROR_INVALIDDATA;
775  comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
776  if (!comp_brands_str)
777  return AVERROR(ENOMEM);
778  avio_read(pb, comp_brands_str, comp_brand_size);
779  comp_brands_str[comp_brand_size] = 0;
780  av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);
781  av_freep(&comp_brands_str);
782 
783  return 0;
784 }
785 
786 /* this atom should contain all header atoms */
787 static int mov_read_moov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
788 {
789  int ret;
790 
791  if ((ret = mov_read_default(c, pb, atom)) < 0)
792  return ret;
793  /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
794  /* so we don't parse the whole file if over a network */
795  c->found_moov=1;
796  return 0; /* now go for mdat */
797 }
798 
799 static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
800 {
801  c->fragment.moof_offset = avio_tell(pb) - 8;
802  av_dlog(c->fc, "moof offset %"PRIx64"\n", c->fragment.moof_offset);
803  return mov_read_default(c, pb, atom);
804 }
805 
806 static void mov_metadata_creation_time(AVDictionary **metadata, int64_t time)
807 {
808  char buffer[32];
809  if (time) {
810  struct tm *ptm;
811  time_t timet;
812  if(time >= 2082844800)
813  time -= 2082844800; /* seconds between 1904-01-01 and Epoch */
814  timet = time;
815  ptm = gmtime(&timet);
816  if (!ptm) return;
817  strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
818  av_dict_set(metadata, "creation_time", buffer, 0);
819  }
820 }
821 
822 static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
823 {
824  AVStream *st;
825  MOVStreamContext *sc;
826  int version;
827  char language[4] = {0};
828  unsigned lang;
829  int64_t creation_time;
830 
831  if (c->fc->nb_streams < 1)
832  return 0;
833  st = c->fc->streams[c->fc->nb_streams-1];
834  sc = st->priv_data;
835 
836  version = avio_r8(pb);
837  if (version > 1) {
838  av_log_ask_for_sample(c->fc, "unsupported version %d\n", version);
839  return AVERROR_PATCHWELCOME;
840  }
841  avio_rb24(pb); /* flags */
842  if (version == 1) {
843  creation_time = avio_rb64(pb);
844  avio_rb64(pb);
845  } else {
846  creation_time = avio_rb32(pb);
847  avio_rb32(pb); /* modification time */
848  }
849  mov_metadata_creation_time(&st->metadata, creation_time);
850 
851  sc->time_scale = avio_rb32(pb);
852  st->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
853 
854  lang = avio_rb16(pb); /* language */
855  if (ff_mov_lang_to_iso639(lang, language))
856  av_dict_set(&st->metadata, "language", language, 0);
857  avio_rb16(pb); /* quality */
858 
859  return 0;
860 }
861 
862 static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
863 {
864  int64_t creation_time;
865  int version = avio_r8(pb); /* version */
866  avio_rb24(pb); /* flags */
867 
868  if (version == 1) {
869  creation_time = avio_rb64(pb);
870  avio_rb64(pb);
871  } else {
872  creation_time = avio_rb32(pb);
873  avio_rb32(pb); /* modification time */
874  }
875  mov_metadata_creation_time(&c->fc->metadata, creation_time);
876  c->time_scale = avio_rb32(pb); /* time scale */
877 
878  av_dlog(c->fc, "time scale = %i\n", c->time_scale);
879 
880  c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
881  // set the AVCodecContext duration because the duration of individual tracks
882  // may be inaccurate
883  if (c->time_scale > 0)
884  c->fc->duration = av_rescale(c->duration, AV_TIME_BASE, c->time_scale);
885  avio_rb32(pb); /* preferred scale */
886 
887  avio_rb16(pb); /* preferred volume */
888 
889  avio_skip(pb, 10); /* reserved */
890 
891  avio_skip(pb, 36); /* display matrix */
892 
893  avio_rb32(pb); /* preview time */
894  avio_rb32(pb); /* preview duration */
895  avio_rb32(pb); /* poster time */
896  avio_rb32(pb); /* selection time */
897  avio_rb32(pb); /* selection duration */
898  avio_rb32(pb); /* current time */
899  avio_rb32(pb); /* next track ID */
900  return 0;
901 }
902 
903 static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
904 {
905  AVStream *st;
906  int little_endian;
907 
908  if (c->fc->nb_streams < 1)
909  return 0;
910  st = c->fc->streams[c->fc->nb_streams-1];
911 
912  little_endian = avio_rb16(pb) & 0xFF;
913  av_dlog(c->fc, "enda %d\n", little_endian);
914  if (little_endian == 1) {
915  switch (st->codec->codec_id) {
916  case AV_CODEC_ID_PCM_S24BE:
917  st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
918  break;
919  case AV_CODEC_ID_PCM_S32BE:
920  st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
921  break;
922  case AV_CODEC_ID_PCM_F32BE:
923  st->codec->codec_id = AV_CODEC_ID_PCM_F32LE;
924  break;
925  case AV_CODEC_ID_PCM_F64BE:
926  st->codec->codec_id = AV_CODEC_ID_PCM_F64LE;
927  break;
928  default:
929  break;
930  }
931  }
932  return 0;
933 }
934 
935 static int mov_read_fiel(MOVContext *c, AVIOContext *pb, MOVAtom atom)
936 {
937  AVStream *st;
938  unsigned mov_field_order;
939  enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;
940 
941  if (c->fc->nb_streams < 1) // will happen with jp2 files
942  return 0;
943  st = c->fc->streams[c->fc->nb_streams-1];
944  if (atom.size < 2)
945  return AVERROR_INVALIDDATA;
946  mov_field_order = avio_rb16(pb);
947  if ((mov_field_order & 0xFF00) == 0x0100)
948  decoded_field_order = AV_FIELD_PROGRESSIVE;
949  else if ((mov_field_order & 0xFF00) == 0x0200) {
950  switch (mov_field_order & 0xFF) {
951  case 0x01: decoded_field_order = AV_FIELD_TT;
952  break;
953  case 0x06: decoded_field_order = AV_FIELD_BB;
954  break;
955  case 0x09: decoded_field_order = AV_FIELD_TB;
956  break;
957  case 0x0E: decoded_field_order = AV_FIELD_BT;
958  break;
959  }
960  }
961  if (decoded_field_order == AV_FIELD_UNKNOWN && mov_field_order) {
962  av_log(NULL, AV_LOG_ERROR, "Unknown MOV field order 0x%04x\n", mov_field_order);
963  }
964  st->codec->field_order = decoded_field_order;
965 
966  return 0;
967 }
968 
969 /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
970 static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom,
971  enum AVCodecID codec_id)
972 {
973  AVStream *st;
974  uint64_t size;
975  uint8_t *buf;
976 
977  if (c->fc->nb_streams < 1) // will happen with jp2 files
978  return 0;
979  st= c->fc->streams[c->fc->nb_streams-1];
980 
981  if (st->codec->codec_id != codec_id)
982  return 0; /* unexpected codec_id - don't mess with extradata */
983 
984  size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
985  if (size > INT_MAX || (uint64_t)atom.size > INT_MAX)
986  return AVERROR_INVALIDDATA;
987  buf= av_realloc(st->codec->extradata, size);
988  if (!buf)
989  return AVERROR(ENOMEM);
990  st->codec->extradata= buf;
991  buf+= st->codec->extradata_size;
992  st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
993  AV_WB32( buf , atom.size + 8);
994  AV_WL32( buf + 4, atom.type);
995  avio_read(pb, buf + 8, atom.size);
996  return 0;
997 }
998 
999 /* wrapper functions for reading ALAC/AVS/MJPEG/MJPEG2000 extradata atoms only for those codecs */
1000 static int mov_read_alac(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1001 {
1002  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_ALAC);
1003 }
1004 
1005 static int mov_read_avss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1006 {
1007  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVS);
1008 }
1009 
1010 static int mov_read_jp2h(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1011 {
1012  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_JPEG2000);
1013 }
1014 
1015 static int mov_read_avid(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1016 {
1017  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVUI);
1018 }
1019 
1020 static int mov_read_svq3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1021 {
1022  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_SVQ3);
1023 }
1024 
1025 static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1026 {
1027  AVStream *st;
1028 
1029  if (c->fc->nb_streams < 1)
1030  return 0;
1031  st = c->fc->streams[c->fc->nb_streams-1];
1032 
1033  if ((uint64_t)atom.size > (1<<30))
1034  return AVERROR_INVALIDDATA;
1035 
1036  if (st->codec->codec_id == AV_CODEC_ID_QDM2 || st->codec->codec_id == AV_CODEC_ID_QDMC) {
1037  // pass all frma atom to codec, needed at least for QDMC and QDM2
1038  av_free(st->codec->extradata);
1039  st->codec->extradata_size = 0;
1040  st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
1041  if (!st->codec->extradata)
1042  return AVERROR(ENOMEM);
1043  st->codec->extradata_size = atom.size;
1044  avio_read(pb, st->codec->extradata, atom.size);
1045  } else if (atom.size > 8) { /* to read frma, esds atoms */
1046  int ret;
1047  if ((ret = mov_read_default(c, pb, atom)) < 0)
1048  return ret;
1049  } else
1050  avio_skip(pb, atom.size);
1051  return 0;
1052 }
1053 
1054 /**
1055  * This function reads atom content and puts data in extradata without tag
1056  * nor size unlike mov_read_extradata.
1057  */
1058 static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1059 {
1060  AVStream *st;
1061 
1062  if (c->fc->nb_streams < 1)
1063  return 0;
1064  st = c->fc->streams[c->fc->nb_streams-1];
1065 
1066  if ((uint64_t)atom.size > (1<<30))
1067  return AVERROR_INVALIDDATA;
1068 
1069  if (atom.size >= 10) {
1070  // Broken files created by legacy versions of libavformat will
1071  // wrap a whole fiel atom inside of a glbl atom.
1072  unsigned size = avio_rb32(pb);
1073  unsigned type = avio_rl32(pb);
1074  avio_seek(pb, -8, SEEK_CUR);
1075  if (type == MKTAG('f','i','e','l') && size == atom.size)
1076  return mov_read_default(c, pb, atom);
1077  }
1078  av_free(st->codec->extradata);
1079  st->codec->extradata_size = 0;
1080  st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
1081  if (!st->codec->extradata)
1082  return AVERROR(ENOMEM);
1083  st->codec->extradata_size = atom.size;
1084  avio_read(pb, st->codec->extradata, atom.size);
1085  return 0;
1086 }
1087 
1088 static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1089 {
1090  AVStream *st;
1091  uint8_t profile_level;
1092 
1093  if (c->fc->nb_streams < 1)
1094  return 0;
1095  st = c->fc->streams[c->fc->nb_streams-1];
1096 
1097  if (atom.size >= (1<<28) || atom.size < 7)
1098  return AVERROR_INVALIDDATA;
1099 
1100  profile_level = avio_r8(pb);
1101  if ((profile_level & 0xf0) != 0xc0)
1102  return 0;
1103 
1104  av_free(st->codec->extradata);
1105  st->codec->extradata_size = 0;
1106  st->codec->extradata = av_mallocz(atom.size - 7 + FF_INPUT_BUFFER_PADDING_SIZE);
1107  if (!st->codec->extradata)
1108  return AVERROR(ENOMEM);
1109  st->codec->extradata_size = atom.size - 7;
1110  avio_seek(pb, 6, SEEK_CUR);
1111  avio_read(pb, st->codec->extradata, st->codec->extradata_size);
1112  return 0;
1113 }
1114 
1115 /**
1116  * An strf atom is a BITMAPINFOHEADER struct. This struct is 40 bytes itself,
1117  * but can have extradata appended at the end after the 40 bytes belonging
1118  * to the struct.
1119  */
1120 static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1121 {
1122  AVStream *st;
1123 
1124  if (c->fc->nb_streams < 1)
1125  return 0;
1126  if (atom.size <= 40)
1127  return 0;
1128  st = c->fc->streams[c->fc->nb_streams-1];
1129 
1130  if ((uint64_t)atom.size > (1<<30))
1131  return AVERROR_INVALIDDATA;
1132 
1133  av_free(st->codec->extradata);
1134  st->codec->extradata_size = 0;
1135  st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);
1136  if (!st->codec->extradata)
1137  return AVERROR(ENOMEM);
1138  st->codec->extradata_size = atom.size - 40;
1139  avio_skip(pb, 40);
1140  avio_read(pb, st->codec->extradata, atom.size - 40);
1141  return 0;
1142 }
1143 
1144 static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1145 {
1146  AVStream *st;
1147  MOVStreamContext *sc;
1148  unsigned int i, entries;
1149 
1150  if (c->fc->nb_streams < 1)
1151  return 0;
1152  st = c->fc->streams[c->fc->nb_streams-1];
1153  sc = st->priv_data;
1154 
1155  avio_r8(pb); /* version */
1156  avio_rb24(pb); /* flags */
1157 
1158  entries = avio_rb32(pb);
1159 
1160  if (!entries)
1161  return 0;
1162  if (entries >= UINT_MAX/sizeof(int64_t))
1163  return AVERROR_INVALIDDATA;
1164 
1165  sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
1166  if (!sc->chunk_offsets)
1167  return AVERROR(ENOMEM);
1168  sc->chunk_count = entries;
1169 
1170  if (atom.type == MKTAG('s','t','c','o'))
1171  for (i = 0; i < entries && !pb->eof_reached; i++)
1172  sc->chunk_offsets[i] = avio_rb32(pb);
1173  else if (atom.type == MKTAG('c','o','6','4'))
1174  for (i = 0; i < entries && !pb->eof_reached; i++)
1175  sc->chunk_offsets[i] = avio_rb64(pb);
1176  else
1177  return AVERROR_INVALIDDATA;
1178 
1179  sc->chunk_count = i;
1180 
1181  if (pb->eof_reached)
1182  return AVERROR_EOF;
1183 
1184  return 0;
1185 }
1186 
1187 /**
1188  * Compute codec id for 'lpcm' tag.
1189  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.
1190  */
1191 enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
1192 {
1193  /* lpcm flags:
1194  * 0x1 = float
1195  * 0x2 = big-endian
1196  * 0x4 = signed
1197  */
1198  return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);
1199 }
1200 
1201 int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
1202 {
1203  AVStream *st;
1204  MOVStreamContext *sc;
1205  int j, pseudo_stream_id;
1206 
1207  if (c->fc->nb_streams < 1)
1208  return 0;
1209  st = c->fc->streams[c->fc->nb_streams-1];
1210  sc = st->priv_data;
1211 
1212  for (pseudo_stream_id = 0;
1213  pseudo_stream_id < entries && !pb->eof_reached;
1214  pseudo_stream_id++) {
1215  //Parsing Sample description table
1216  enum AVCodecID id;
1217  int dref_id = 1;
1218  MOVAtom a = { AV_RL32("stsd") };
1219  int64_t start_pos = avio_tell(pb);
1220  int64_t size = avio_rb32(pb); /* size */
1221  uint32_t format = avio_rl32(pb); /* data format */
1222 
1223  if (size >= 16) {
1224  avio_rb32(pb); /* reserved */
1225  avio_rb16(pb); /* reserved */
1226  dref_id = avio_rb16(pb);
1227  }else if (size <= 7){
1228  av_log(c->fc, AV_LOG_ERROR, "invalid size %"PRId64" in stsd\n", size);
1229  return AVERROR_INVALIDDATA;
1230  }
1231 
1232  if (st->codec->codec_tag &&
1233  st->codec->codec_tag != format &&
1234  (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags, format) != c->fc->video_codec_id
1235  : st->codec->codec_tag != MKTAG('j','p','e','g'))
1236  ){
1237  /* Multiple fourcc, we skip JPEG. This is not correct, we should
1238  * export it as a separate AVStream but this needs a few changes
1239  * in the MOV demuxer, patch welcome. */
1240  av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
1241  avio_skip(pb, size - (avio_tell(pb) - start_pos));
1242  continue;
1243  }
1244  /* we cannot demux concatenated h264 streams because of different extradata */
1245  if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))
1246  av_log(c->fc, AV_LOG_WARNING, "Concatenated H.264 might not play corrently.\n");
1247  sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
1248  sc->dref_id= dref_id;
1249 
1250  st->codec->codec_tag = format;
1251  id = ff_codec_get_id(ff_codec_movaudio_tags, format);
1252  if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))
1253  id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);
1254 
1255  if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {
1256  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1257  } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */
1258  format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
1259  id = ff_codec_get_id(ff_codec_movvideo_tags, format);
1260  if (id <= 0)
1261  id = ff_codec_get_id(ff_codec_bmp_tags, format);
1262  if (id > 0)
1263  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1264  else if (st->codec->codec_type == AVMEDIA_TYPE_DATA ||
1265  (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1266  st->codec->codec_id == AV_CODEC_ID_NONE)){
1267  id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
1268  if (id > 0)
1269  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1270  }
1271  }
1272 
1273  av_dlog(c->fc, "size=%"PRId64" 4CC= %c%c%c%c codec_type=%d\n", size,
1274  (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
1275  (format >> 24) & 0xff, st->codec->codec_type);
1276 
1277  if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
1278  unsigned int color_depth, len;
1279  int color_greyscale;
1280  int color_table_id;
1281 
1282  st->codec->codec_id = id;
1283  avio_rb16(pb); /* version */
1284  avio_rb16(pb); /* revision level */
1285  avio_rb32(pb); /* vendor */
1286  avio_rb32(pb); /* temporal quality */
1287  avio_rb32(pb); /* spatial quality */
1288 
1289  st->codec->width = avio_rb16(pb); /* width */
1290  st->codec->height = avio_rb16(pb); /* height */
1291 
1292  avio_rb32(pb); /* horiz resolution */
1293  avio_rb32(pb); /* vert resolution */
1294  avio_rb32(pb); /* data size, always 0 */
1295  avio_rb16(pb); /* frames per samples */
1296 
1297  len = avio_r8(pb); /* codec name, pascal string */
1298  if (len > 31)
1299  len = 31;
1300  mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);
1301  if (len < 31)
1302  avio_skip(pb, 31 - len);
1303  /* codec_tag YV12 triggers an UV swap in rawdec.c */
1304  if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25)){
1305  st->codec->codec_tag=MKTAG('I', '4', '2', '0');
1306  st->codec->width &= ~1;
1307  st->codec->height &= ~1;
1308  }
1309  /* Flash Media Server uses tag H263 with Sorenson Spark */
1310  if (format == MKTAG('H','2','6','3') &&
1311  !memcmp(st->codec->codec_name, "Sorenson H263", 13))
1312  st->codec->codec_id = AV_CODEC_ID_FLV1;
1313 
1314  st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */
1315  color_table_id = avio_rb16(pb); /* colortable id */
1316  av_dlog(c->fc, "depth %d, ctab id %d\n",
1317  st->codec->bits_per_coded_sample, color_table_id);
1318  /* figure out the palette situation */
1319  color_depth = st->codec->bits_per_coded_sample & 0x1F;
1320  color_greyscale = st->codec->bits_per_coded_sample & 0x20;
1321 
1322  /* if the depth is 2, 4, or 8 bpp, file is palettized */
1323  if ((color_depth == 2) || (color_depth == 4) ||
1324  (color_depth == 8)) {
1325  /* for palette traversal */
1326  unsigned int color_start, color_count, color_end;
1327  unsigned char a, r, g, b;
1328 
1329  if (color_greyscale) {
1330  int color_index, color_dec;
1331  /* compute the greyscale palette */
1332  st->codec->bits_per_coded_sample = color_depth;
1333  color_count = 1 << color_depth;
1334  color_index = 255;
1335  color_dec = 256 / (color_count - 1);
1336  for (j = 0; j < color_count; j++) {
1337  if (id == AV_CODEC_ID_CINEPAK){
1338  r = g = b = color_count - 1 - color_index;
1339  }else
1340  r = g = b = color_index;
1341  sc->palette[j] =
1342  (0xFFU << 24) | (r << 16) | (g << 8) | (b);
1343  color_index -= color_dec;
1344  if (color_index < 0)
1345  color_index = 0;
1346  }
1347  } else if (color_table_id) {
1348  const uint8_t *color_table;
1349  /* if flag bit 3 is set, use the default palette */
1350  color_count = 1 << color_depth;
1351  if (color_depth == 2)
1352  color_table = ff_qt_default_palette_4;
1353  else if (color_depth == 4)
1354  color_table = ff_qt_default_palette_16;
1355  else
1356  color_table = ff_qt_default_palette_256;
1357 
1358  for (j = 0; j < color_count; j++) {
1359  r = color_table[j * 3 + 0];
1360  g = color_table[j * 3 + 1];
1361  b = color_table[j * 3 + 2];
1362  sc->palette[j] =
1363  (0xFFU << 24) | (r << 16) | (g << 8) | (b);
1364  }
1365  } else {
1366  /* load the palette from the file */
1367  color_start = avio_rb32(pb);
1368  color_count = avio_rb16(pb);
1369  color_end = avio_rb16(pb);
1370  if ((color_start <= 255) &&
1371  (color_end <= 255)) {
1372  for (j = color_start; j <= color_end; j++) {
1373  /* each A, R, G, or B component is 16 bits;
1374  * only use the top 8 bits */
1375  a = avio_r8(pb);
1376  avio_r8(pb);
1377  r = avio_r8(pb);
1378  avio_r8(pb);
1379  g = avio_r8(pb);
1380  avio_r8(pb);
1381  b = avio_r8(pb);
1382  avio_r8(pb);
1383  sc->palette[j] =
1384  (a << 24 ) | (r << 16) | (g << 8) | (b);
1385  }
1386  }
1387  }
1388  sc->has_palette = 1;
1389  }
1390  } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
1391  int bits_per_sample, flags;
1392  uint16_t version = avio_rb16(pb);
1393  AVDictionaryEntry *compatible_brands = av_dict_get(c->fc->metadata, "compatible_brands", NULL, AV_DICT_MATCH_CASE);
1394 
1395  st->codec->codec_id = id;
1396  avio_rb16(pb); /* revision level */
1397  avio_rb32(pb); /* vendor */
1398 
1399  st->codec->channels = avio_rb16(pb); /* channel count */
1400  av_dlog(c->fc, "audio channels %d\n", st->codec->channels);
1401  st->codec->bits_per_coded_sample = avio_rb16(pb); /* sample size */
1402 
1403  sc->audio_cid = avio_rb16(pb);
1404  avio_rb16(pb); /* packet size = 0 */
1405 
1406  st->codec->sample_rate = ((avio_rb32(pb) >> 16));
1407 
1408  //Read QT version 1 fields. In version 0 these do not exist.
1409  av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);
1410  if (!c->isom ||
1411  (compatible_brands && strstr(compatible_brands->value, "qt "))) {
1412  if (version==1) {
1413  sc->samples_per_frame = avio_rb32(pb);
1414  avio_rb32(pb); /* bytes per packet */
1415  sc->bytes_per_frame = avio_rb32(pb);
1416  avio_rb32(pb); /* bytes per sample */
1417  } else if (version==2) {
1418  avio_rb32(pb); /* sizeof struct only */
1419  st->codec->sample_rate = av_int2double(avio_rb64(pb)); /* float 64 */
1420  st->codec->channels = avio_rb32(pb);
1421  avio_rb32(pb); /* always 0x7F000000 */
1422  st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */
1423  flags = avio_rb32(pb); /* lpcm format specific flag */
1424  sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */
1425  sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */
1426  if (format == MKTAG('l','p','c','m'))
1427  st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);
1428  }
1429  }
1430 
1431  switch (st->codec->codec_id) {
1432  case AV_CODEC_ID_PCM_S8:
1433  case AV_CODEC_ID_PCM_U8:
1434  if (st->codec->bits_per_coded_sample == 16)
1435  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
1436  break;
1437  case AV_CODEC_ID_PCM_S16LE:
1438  case AV_CODEC_ID_PCM_S16BE:
1439  if (st->codec->bits_per_coded_sample == 8)
1440  st->codec->codec_id = AV_CODEC_ID_PCM_S8;
1441  else if (st->codec->bits_per_coded_sample == 24)
1442  st->codec->codec_id =
1443  st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?
1444  AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
1445  break;
1446  /* set values for old format before stsd version 1 appeared */
1447  case AV_CODEC_ID_MACE3:
1448  sc->samples_per_frame = 6;
1449  sc->bytes_per_frame = 2*st->codec->channels;
1450  break;
1451  case AV_CODEC_ID_MACE6:
1452  sc->samples_per_frame = 6;
1453  sc->bytes_per_frame = 1*st->codec->channels;
1454  break;
1455  case AV_CODEC_ID_ADPCM_IMA_QT:
1456  sc->samples_per_frame = 64;
1457  sc->bytes_per_frame = 34*st->codec->channels;
1458  break;
1459  case AV_CODEC_ID_GSM:
1460  sc->samples_per_frame = 160;
1461  sc->bytes_per_frame = 33;
1462  break;
1463  default:
1464  break;
1465  }
1466 
1467  bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
1468  if (bits_per_sample) {
1469  st->codec->bits_per_coded_sample = bits_per_sample;
1470  sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
1471  }
1472  } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){
1473  // ttxt stsd contains display flags, justification, background
1474  // color, fonts, and default styles, so fake an atom to read it
1475  MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };
1476  if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom
1477  mov_read_glbl(c, pb, fake_atom);
1478  st->codec->codec_id= id;
1479  st->codec->width = sc->width;
1480  st->codec->height = sc->height;
1481  } else {
1482  if (st->codec->codec_tag == MKTAG('t','m','c','d')) {
1483  MOVStreamContext *tmcd_ctx = st->priv_data;
1484  int val;
1485  avio_rb32(pb); /* reserved */
1486  val = avio_rb32(pb); /* flags */
1487  tmcd_ctx->tmcd_flags = val;
1488  if (val & 1)
1489  st->codec->flags2 |= CODEC_FLAG2_DROP_FRAME_TIMECODE;
1490  avio_rb32(pb); /* time scale */
1491  avio_rb32(pb); /* frame duration */
1492  st->codec->time_base.den = avio_r8(pb); /* number of frame */
1493  st->codec->time_base.num = 1;
1494  }
1495  /* other codec type, just skip (rtp, mp4s, ...) */
1496  avio_skip(pb, size - (avio_tell(pb) - start_pos));
1497  }
1498  /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
1499  a.size = size - (avio_tell(pb) - start_pos);
1500  if (a.size > 8) {
1501  int ret;
1502  if ((ret = mov_read_default(c, pb, a)) < 0)
1503  return ret;
1504  } else if (a.size > 0)
1505  avio_skip(pb, a.size);
1506  }
1507 
1508  if (pb->eof_reached)
1509  return AVERROR_EOF;
1510 
1511  if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)
1512  st->codec->sample_rate= sc->time_scale;
1513 
1514  /* special codec parameters handling */
1515  switch (st->codec->codec_id) {
1516 #if CONFIG_DV_DEMUXER
1517  case AV_CODEC_ID_DVAUDIO:
1518  c->dv_fctx = avformat_alloc_context();
1519  c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);
1520  if (!c->dv_demux) {
1521  av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
1522  return AVERROR(ENOMEM);
1523  }
1524  sc->dv_audio_container = 1;
1525  st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
1526  break;
1527 #endif
1528  /* no ifdef since parameters are always those */
1529  case AV_CODEC_ID_QCELP:
1530  // force sample rate for qcelp when not stored in mov
1531  if (st->codec->codec_tag != MKTAG('Q','c','l','p'))
1532  st->codec->sample_rate = 8000;
1533  st->codec->channels= 1; /* really needed */
1534  break;
1535  case AV_CODEC_ID_AMR_NB:
1536  st->codec->channels= 1; /* really needed */
1537  /* force sample rate for amr, stsd in 3gp does not store sample rate */
1538  st->codec->sample_rate = 8000;
1539  break;
1540  case AV_CODEC_ID_AMR_WB:
1541  st->codec->channels = 1;
1542  st->codec->sample_rate = 16000;
1543  break;
1544  case AV_CODEC_ID_MP2:
1545  case AV_CODEC_ID_MP3:
1546  st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
1547  st->need_parsing = AVSTREAM_PARSE_FULL;
1548  break;
1549  case AV_CODEC_ID_GSM:
1550  case AV_CODEC_ID_ADPCM_MS:
1551  case AV_CODEC_ID_ADPCM_IMA_WAV:
1552  case AV_CODEC_ID_ILBC:
1553  st->codec->block_align = sc->bytes_per_frame;
1554  break;
1555  case AV_CODEC_ID_ALAC:
1556  if (st->codec->extradata_size == 36) {
1557  st->codec->channels = AV_RB8 (st->codec->extradata+21);
1558  st->codec->sample_rate = AV_RB32(st->codec->extradata+32);
1559  }
1560  break;
1561  case AV_CODEC_ID_AC3:
1562  st->need_parsing = AVSTREAM_PARSE_FULL;
1563  break;
1564  case AV_CODEC_ID_MPEG1VIDEO:
1565  st->need_parsing = AVSTREAM_PARSE_FULL;
1566  break;
1567  case AV_CODEC_ID_VC1:
1568  st->need_parsing = AVSTREAM_PARSE_FULL;
1569  break;
1570  default:
1571  break;
1572  }
1573 
1574  return 0;
1575 }
1576 
1577 static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1578 {
1579  int entries;
1580 
1581  avio_r8(pb); /* version */
1582  avio_rb24(pb); /* flags */
1583  entries = avio_rb32(pb);
1584 
1585  return ff_mov_read_stsd_entries(c, pb, entries);
1586 }
1587 
1588 static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1589 {
1590  AVStream *st;
1591  MOVStreamContext *sc;
1592  unsigned int i, entries;
1593 
1594  if (c->fc->nb_streams < 1)
1595  return 0;
1596  st = c->fc->streams[c->fc->nb_streams-1];
1597  sc = st->priv_data;
1598 
1599  avio_r8(pb); /* version */
1600  avio_rb24(pb); /* flags */
1601 
1602  entries = avio_rb32(pb);
1603 
1604  av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
1605 
1606  if (!entries)
1607  return 0;
1608  if (entries >= UINT_MAX / sizeof(*sc->stsc_data))
1609  return AVERROR_INVALIDDATA;
1610  sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
1611  if (!sc->stsc_data)
1612  return AVERROR(ENOMEM);
1613 
1614  for (i = 0; i < entries && !pb->eof_reached; i++) {
1615  sc->stsc_data[i].first = avio_rb32(pb);
1616  sc->stsc_data[i].count = avio_rb32(pb);
1617  sc->stsc_data[i].id = avio_rb32(pb);
1618  }
1619 
1620  sc->stsc_count = i;
1621 
1622  if (pb->eof_reached)
1623  return AVERROR_EOF;
1624 
1625  return 0;
1626 }
1627 
1628 static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1629 {
1630  AVStream *st;
1631  MOVStreamContext *sc;
1632  unsigned i, entries;
1633 
1634  if (c->fc->nb_streams < 1)
1635  return 0;
1636  st = c->fc->streams[c->fc->nb_streams-1];
1637  sc = st->priv_data;
1638 
1639  avio_rb32(pb); // version + flags
1640 
1641  entries = avio_rb32(pb);
1642  if (entries >= UINT_MAX / sizeof(*sc->stps_data))
1643  return AVERROR_INVALIDDATA;
1644  sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));
1645  if (!sc->stps_data)
1646  return AVERROR(ENOMEM);
1647 
1648  for (i = 0; i < entries && !pb->eof_reached; i++) {
1649  sc->stps_data[i] = avio_rb32(pb);
1650  //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);
1651  }
1652 
1653  sc->stps_count = i;
1654 
1655  if (pb->eof_reached)
1656  return AVERROR_EOF;
1657 
1658  return 0;
1659 }
1660 
1661 static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1662 {
1663  AVStream *st;
1664  MOVStreamContext *sc;
1665  unsigned int i, entries;
1666 
1667  if (c->fc->nb_streams < 1)
1668  return 0;
1669  st = c->fc->streams[c->fc->nb_streams-1];
1670  sc = st->priv_data;
1671 
1672  avio_r8(pb); /* version */
1673  avio_rb24(pb); /* flags */
1674 
1675  entries = avio_rb32(pb);
1676 
1677  av_dlog(c->fc, "keyframe_count = %d\n", entries);
1678 
1679  if (!entries)
1680  {
1681  sc->keyframe_absent = 1;
1682  return 0;
1683  }
1684  if (entries >= UINT_MAX / sizeof(int))
1685  return AVERROR_INVALIDDATA;
1686  sc->keyframes = av_malloc(entries * sizeof(int));
1687  if (!sc->keyframes)
1688  return AVERROR(ENOMEM);
1689 
1690  for (i = 0; i < entries && !pb->eof_reached; i++) {
1691  sc->keyframes[i] = avio_rb32(pb);
1692  //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
1693  }
1694 
1695  sc->keyframe_count = i;
1696 
1697  if (pb->eof_reached)
1698  return AVERROR_EOF;
1699 
1700  return 0;
1701 }
1702 
1703 static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1704 {
1705  AVStream *st;
1706  MOVStreamContext *sc;
1707  unsigned int i, entries, sample_size, field_size, num_bytes;
1708  GetBitContext gb;
1709  unsigned char* buf;
1710 
1711  if (c->fc->nb_streams < 1)
1712  return 0;
1713  st = c->fc->streams[c->fc->nb_streams-1];
1714  sc = st->priv_data;
1715 
1716  avio_r8(pb); /* version */
1717  avio_rb24(pb); /* flags */
1718 
1719  if (atom.type == MKTAG('s','t','s','z')) {
1720  sample_size = avio_rb32(pb);
1721  if (!sc->sample_size) /* do not overwrite value computed in stsd */
1722  sc->sample_size = sample_size;
1723  sc->alt_sample_size = sample_size;
1724  field_size = 32;
1725  } else {
1726  sample_size = 0;
1727  avio_rb24(pb); /* reserved */
1728  field_size = avio_r8(pb);
1729  }
1730  entries = avio_rb32(pb);
1731 
1732  av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);
1733 
1734  sc->sample_count = entries;
1735  if (sample_size)
1736  return 0;
1737 
1738  if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
1739  av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);
1740  return AVERROR_INVALIDDATA;
1741  }
1742 
1743  if (!entries)
1744  return 0;
1745  if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
1746  return AVERROR_INVALIDDATA;
1747  sc->sample_sizes = av_malloc(entries * sizeof(int));
1748  if (!sc->sample_sizes)
1749  return AVERROR(ENOMEM);
1750 
1751  num_bytes = (entries*field_size+4)>>3;
1752 
1753  buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
1754  if (!buf) {
1755  av_freep(&sc->sample_sizes);
1756  return AVERROR(ENOMEM);
1757  }
1758 
1759  if (avio_read(pb, buf, num_bytes) < num_bytes) {
1760  av_freep(&sc->sample_sizes);
1761  av_free(buf);
1762  return AVERROR_INVALIDDATA;
1763  }
1764 
1765  init_get_bits(&gb, buf, 8*num_bytes);
1766 
1767  for (i = 0; i < entries && !pb->eof_reached; i++) {
1768  sc->sample_sizes[i] = get_bits_long(&gb, field_size);
1769  sc->data_size += sc->sample_sizes[i];
1770  }
1771 
1772  sc->sample_count = i;
1773 
1774  if (pb->eof_reached)
1775  return AVERROR_EOF;
1776 
1777  av_free(buf);
1778  return 0;
1779 }
1780 
1781 static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1782 {
1783  AVStream *st;
1784  MOVStreamContext *sc;
1785  unsigned int i, entries;
1786  int64_t duration=0;
1787  int64_t total_sample_count=0;
1788 
1789  if (c->fc->nb_streams < 1)
1790  return 0;
1791  st = c->fc->streams[c->fc->nb_streams-1];
1792  sc = st->priv_data;
1793 
1794  avio_r8(pb); /* version */
1795  avio_rb24(pb); /* flags */
1796  entries = avio_rb32(pb);
1797 
1798  av_dlog(c->fc, "track[%i].stts.entries = %i\n",
1799  c->fc->nb_streams-1, entries);
1800 
1801  if (entries >= UINT_MAX / sizeof(*sc->stts_data))
1802  return -1;
1803 
1804  sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
1805  if (!sc->stts_data)
1806  return AVERROR(ENOMEM);
1807 
1808  for (i = 0; i < entries && !pb->eof_reached; i++) {
1809  int sample_duration;
1810  int sample_count;
1811 
1812  sample_count=avio_rb32(pb);
1813  sample_duration = avio_rb32(pb);
1814  /* sample_duration < 0 is invalid based on the spec */
1815  if (sample_duration < 0) {
1816  av_log(c->fc, AV_LOG_ERROR, "Invalid SampleDelta in STTS %d\n", sample_duration);
1817  sample_duration = 1;
1818  }
1819  sc->stts_data[i].count= sample_count;
1820  sc->stts_data[i].duration= sample_duration;
1821 
1822  av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",
1823  sample_count, sample_duration);
1824 
1825  duration+=(int64_t)sample_duration*sample_count;
1826  total_sample_count+=sample_count;
1827  }
1828 
1829  sc->stts_count = i;
1830 
1831  if (pb->eof_reached)
1832  return AVERROR_EOF;
1833 
1834  st->nb_frames= total_sample_count;
1835  if (duration)
1836  st->duration= duration;
1837  sc->track_end = duration;
1838  return 0;
1839 }
1840 
1841 static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1842 {
1843  AVStream *st;
1844  MOVStreamContext *sc;
1845  unsigned int i, entries;
1846 
1847  if (c->fc->nb_streams < 1)
1848  return 0;
1849  st = c->fc->streams[c->fc->nb_streams-1];
1850  sc = st->priv_data;
1851 
1852  avio_r8(pb); /* version */
1853  avio_rb24(pb); /* flags */
1854  entries = avio_rb32(pb);
1855 
1856  av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
1857 
1858  if (!entries)
1859  return 0;
1860  if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
1861  return AVERROR_INVALIDDATA;
1862  sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
1863  if (!sc->ctts_data)
1864  return AVERROR(ENOMEM);
1865 
1866  for (i = 0; i < entries && !pb->eof_reached; i++) {
1867  int count =avio_rb32(pb);
1868  int duration =avio_rb32(pb);
1869 
1870  sc->ctts_data[i].count = count;
1871  sc->ctts_data[i].duration= duration;
1872 
1873  av_dlog(c->fc, "count=%d, duration=%d\n",
1874  count, duration);
1875 
1876  if (FFABS(duration) > (1<<28) && i+2<entries) {
1877  av_log(c->fc, AV_LOG_WARNING, "CTTS invalid\n");
1878  av_freep(&sc->ctts_data);
1879  sc->ctts_count = 0;
1880  return 0;
1881  }
1882 
1883  if (duration < 0 && i+2<entries)
1884  sc->dts_shift = FFMAX(sc->dts_shift, -duration);
1885  }
1886 
1887  sc->ctts_count = i;
1888 
1889  if (pb->eof_reached)
1890  return AVERROR_EOF;
1891 
1892  av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);
1893 
1894  return 0;
1895 }
1896 
1897 static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1898 {
1899  AVStream *st;
1900  MOVStreamContext *sc;
1901  unsigned int i, entries;
1902  uint8_t version;
1903  uint32_t grouping_type;
1904 
1905  if (c->fc->nb_streams < 1)
1906  return 0;
1907  st = c->fc->streams[c->fc->nb_streams-1];
1908  sc = st->priv_data;
1909 
1910  version = avio_r8(pb); /* version */
1911  avio_rb24(pb); /* flags */
1912  grouping_type = avio_rl32(pb);
1913  if (grouping_type != MKTAG( 'r','a','p',' '))
1914  return 0; /* only support 'rap ' grouping */
1915  if (version == 1)
1916  avio_rb32(pb); /* grouping_type_parameter */
1917 
1918  entries = avio_rb32(pb);
1919  if (!entries)
1920  return 0;
1921  if (entries >= UINT_MAX / sizeof(*sc->rap_group))
1922  return AVERROR_INVALIDDATA;
1923  sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));
1924  if (!sc->rap_group)
1925  return AVERROR(ENOMEM);
1926 
1927  for (i = 0; i < entries && !pb->eof_reached; i++) {
1928  sc->rap_group[i].count = avio_rb32(pb); /* sample_count */
1929  sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */
1930  }
1931 
1932  sc->rap_group_count = i;
1933 
1934  return pb->eof_reached ? AVERROR_EOF : 0;
1935 }
1936 
1937 static void mov_build_index(MOVContext *mov, AVStream *st)
1938 {
1939  MOVStreamContext *sc = st->priv_data;
1940  int64_t current_offset;
1941  int64_t current_dts = 0;
1942  unsigned int stts_index = 0;
1943  unsigned int stsc_index = 0;
1944  unsigned int stss_index = 0;
1945  unsigned int stps_index = 0;
1946  unsigned int i, j;
1947  uint64_t stream_size = 0;
1948  AVIndexEntry *mem;
1949 
1950  /* adjust first dts according to edit list */
1951  if ((sc->empty_duration || sc->start_time) && mov->time_scale > 0) {
1952  if (sc->empty_duration)
1953  sc->empty_duration = av_rescale(sc->empty_duration, sc->time_scale, mov->time_scale);
1954  sc->time_offset = sc->start_time - sc->empty_duration;
1955  current_dts = -sc->time_offset;
1956  if (sc->ctts_count>0 && sc->stts_count>0 &&
1957  sc->ctts_data[0].duration / FFMAX(sc->stts_data[0].duration, 1) > 16) {
1958  /* more than 16 frames delay, dts are likely wrong
1959  this happens with files created by iMovie */
1960  sc->wrong_dts = 1;
1961  st->codec->has_b_frames = 1;
1962  }
1963  }
1964 
1965  /* only use old uncompressed audio chunk demuxing when stts specifies it */
1966  if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
1967  sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
1968  unsigned int current_sample = 0;
1969  unsigned int stts_sample = 0;
1970  unsigned int sample_size;
1971  unsigned int distance = 0;
1972  unsigned int rap_group_index = 0;
1973  unsigned int rap_group_sample = 0;
1974  int rap_group_present = sc->rap_group_count && sc->rap_group;
1975  int key_off = (sc->keyframe_count && sc->keyframes[0] > 0) || (sc->stps_count && sc->stps_data[0] > 0);
1976 
1977  current_dts -= sc->dts_shift;
1978 
1979  if (!sc->sample_count || st->nb_index_entries)
1980  return;
1981  if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
1982  return;
1983  mem = av_realloc(st->index_entries, (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries));
1984  if (!mem)
1985  return;
1986  st->index_entries = mem;
1987  st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);
1988 
1989  for (i = 0; i < sc->chunk_count; i++) {
1990  current_offset = sc->chunk_offsets[i];
1991  while (stsc_index + 1 < sc->stsc_count &&
1992  i + 1 == sc->stsc_data[stsc_index + 1].first)
1993  stsc_index++;
1994  for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
1995  int keyframe = 0;
1996  if (current_sample >= sc->sample_count) {
1997  av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
1998  return;
1999  }
2000 
2001  if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {
2002  keyframe = 1;
2003  if (stss_index + 1 < sc->keyframe_count)
2004  stss_index++;
2005  } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
2006  keyframe = 1;
2007  if (stps_index + 1 < sc->stps_count)
2008  stps_index++;
2009  }
2010  if (rap_group_present && rap_group_index < sc->rap_group_count) {
2011  if (sc->rap_group[rap_group_index].index > 0)
2012  keyframe = 1;
2013  if (++rap_group_sample == sc->rap_group[rap_group_index].count) {
2014  rap_group_sample = 0;
2015  rap_group_index++;
2016  }
2017  }
2018  if (keyframe)
2019  distance = 0;
2020  sample_size = sc->alt_sample_size > 0 ? sc->alt_sample_size : sc->sample_sizes[current_sample];
2021  if (sc->pseudo_stream_id == -1 ||
2022  sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
2023  AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];
2024  e->pos = current_offset;
2025  e->timestamp = current_dts;
2026  e->size = sample_size;
2027  e->min_distance = distance;
2028  e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
2029  av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
2030  "size %d, distance %d, keyframe %d\n", st->index, current_sample,
2031  current_offset, current_dts, sample_size, distance, keyframe);
2032  }
2033 
2034  current_offset += sample_size;
2035  stream_size += sample_size;
2036  current_dts += sc->stts_data[stts_index].duration;
2037  distance++;
2038  stts_sample++;
2039  current_sample++;
2040  if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
2041  stts_sample = 0;
2042  stts_index++;
2043  }
2044  }
2045  }
2046  if (st->duration > 0)
2047  st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;
2048  } else {
2049  unsigned chunk_samples, total = 0;
2050 
2051  // compute total chunk count
2052  for (i = 0; i < sc->stsc_count; i++) {
2053  unsigned count, chunk_count;
2054 
2055  chunk_samples = sc->stsc_data[i].count;
2056  if (i != sc->stsc_count - 1 &&
2057  sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
2058  av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
2059  return;
2060  }
2061 
2062  if (sc->samples_per_frame >= 160) { // gsm
2063  count = chunk_samples / sc->samples_per_frame;
2064  } else if (sc->samples_per_frame > 1) {
2065  unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
2066  count = (chunk_samples+samples-1) / samples;
2067  } else {
2068  count = (chunk_samples+1023) / 1024;
2069  }
2070 
2071  if (i < sc->stsc_count - 1)
2072  chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
2073  else
2074  chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
2075  total += chunk_count * count;
2076  }
2077 
2078  av_dlog(mov->fc, "chunk count %d\n", total);
2079  if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
2080  return;
2081  mem = av_realloc(st->index_entries, (st->nb_index_entries + total) * sizeof(*st->index_entries));
2082  if (!mem)
2083  return;
2084  st->index_entries = mem;
2085  st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);
2086 
2087  // populate index
2088  for (i = 0; i < sc->chunk_count; i++) {
2089  current_offset = sc->chunk_offsets[i];
2090  if (stsc_index + 1 < sc->stsc_count &&
2091  i + 1 == sc->stsc_data[stsc_index + 1].first)
2092  stsc_index++;
2093  chunk_samples = sc->stsc_data[stsc_index].count;
2094 
2095  while (chunk_samples > 0) {
2096  AVIndexEntry *e;
2097  unsigned size, samples;
2098 
2099  if (sc->samples_per_frame >= 160) { // gsm
2100  samples = sc->samples_per_frame;
2101  size = sc->bytes_per_frame;
2102  } else {
2103  if (sc->samples_per_frame > 1) {
2104  samples = FFMIN((1024 / sc->samples_per_frame)*
2105  sc->samples_per_frame, chunk_samples);
2106  size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
2107  } else {
2108  samples = FFMIN(1024, chunk_samples);
2109  size = samples * sc->sample_size;
2110  }
2111  }
2112 
2113  if (st->nb_index_entries >= total) {
2114  av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);
2115  return;
2116  }
2117  e = &st->index_entries[st->nb_index_entries++];
2118  e->pos = current_offset;
2119  e->timestamp = current_dts;
2120  e->size = size;
2121  e->min_distance = 0;
2122  e->flags = AVINDEX_KEYFRAME;
2123  av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "
2124  "size %d, duration %d\n", st->index, i, current_offset, current_dts,
2125  size, samples);
2126 
2127  current_offset += size;
2128  current_dts += samples;
2129  chunk_samples -= samples;
2130  }
2131  }
2132  }
2133 }
2134 
2135 static int mov_open_dref(AVIOContext **pb, const char *src, MOVDref *ref,
2136  AVIOInterruptCB *int_cb, int use_absolute_path, AVFormatContext *fc)
2137 {
2138  /* try relative path, we do not try the absolute because it can leak information about our
2139  system to an attacker */
2140  if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
2141  char filename[1024];
2142  const char *src_path;
2143  int i, l;
2144 
2145  /* find a source dir */
2146  src_path = strrchr(src, '/');
2147  if (src_path)
2148  src_path++;
2149  else
2150  src_path = src;
2151 
2152  /* find a next level down to target */
2153  for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)
2154  if (ref->path[l] == '/') {
2155  if (i == ref->nlvl_to - 1)
2156  break;
2157  else
2158  i++;
2159  }
2160 
2161  /* compose filename if next level down to target was found */
2162  if (i == ref->nlvl_to - 1 && src_path - src < sizeof(filename)) {
2163  memcpy(filename, src, src_path - src);
2164  filename[src_path - src] = 0;
2165 
2166  for (i = 1; i < ref->nlvl_from; i++)
2167  av_strlcat(filename, "../", 1024);
2168 
2169  av_strlcat(filename, ref->path + l + 1, 1024);
2170 
2171  if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))
2172  return 0;
2173  }
2174  } else if (use_absolute_path) {
2175  av_log(fc, AV_LOG_WARNING, "Using absolute path on user request, "
2176  "this is a possible security issue\n");
2177  if (!avio_open2(pb, ref->path, AVIO_FLAG_READ, int_cb, NULL))
2178  return 0;
2179  }
2180 
2181  return AVERROR(ENOENT);
2182 }
2183 
2184 static void fix_timescale(MOVContext *c, MOVStreamContext *sc)
2185 {
2186  if (sc->time_scale <= 0) {
2187  av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", sc->ffindex);
2188  sc->time_scale = c->time_scale;
2189  if (sc->time_scale <= 0)
2190  sc->time_scale = 1;
2191  }
2192 }
2193 
2194 static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2195 {
2196  AVStream *st;
2197  MOVStreamContext *sc;
2198  int ret;
2199 
2200  st = avformat_new_stream(c->fc, NULL);
2201  if (!st) return AVERROR(ENOMEM);
2202  st->id = c->fc->nb_streams;
2203  sc = av_mallocz(sizeof(MOVStreamContext));
2204  if (!sc) return AVERROR(ENOMEM);
2205 
2206  st->priv_data = sc;
2207  st->codec->codec_type = AVMEDIA_TYPE_DATA;
2208  sc->ffindex = st->index;
2209 
2210  if ((ret = mov_read_default(c, pb, atom)) < 0)
2211  return ret;
2212 
2213  /* sanity checks */
2214  if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
2215  (!sc->sample_size && !sc->sample_count))) {
2216  av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
2217  st->index);
2218  return 0;
2219  }
2220 
2221  fix_timescale(c, sc);
2222 
2223  avpriv_set_pts_info(st, 64, 1, sc->time_scale);
2224 
2225  mov_build_index(c, st);
2226 
2227  if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
2228  MOVDref *dref = &sc->drefs[sc->dref_id - 1];
2229  if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback,
2230  c->use_absolute_path, c->fc) < 0)
2231  av_log(c->fc, AV_LOG_ERROR,
2232  "stream %d, error opening alias: path='%s', dir='%s', "
2233  "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
2234  st->index, dref->path, dref->dir, dref->filename,
2235  dref->volume, dref->nlvl_from, dref->nlvl_to);
2236  } else {
2237  sc->pb = c->fc->pb;
2238  sc->pb_is_copied = 1;
2239  }
2240 
2241  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
2242  if (!st->sample_aspect_ratio.num &&
2243  (st->codec->width != sc->width || st->codec->height != sc->height)) {
2244  st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /
2245  ((double)st->codec->width * sc->height), INT_MAX);
2246  }
2247 
2248  if (st->duration > 0)
2249  av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2250  sc->time_scale*st->nb_frames, st->duration, INT_MAX);
2251 
2252 #if FF_API_R_FRAME_RATE
2253  if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))
2254  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
2255  sc->time_scale, sc->stts_data[0].duration, INT_MAX);
2256 #endif
2257  }
2258 
2259  // done for ai5q, ai52, ai55, ai1q, ai12 and ai15.
2260  if (!st->codec->extradata_size && st->codec->codec_id == AV_CODEC_ID_H264 &&
2261  st->codec->codec_tag != MKTAG('a', 'v', 'c', '1')) {
2262  ff_generate_avci_extradata(st);
2263  }
2264 
2265  switch (st->codec->codec_id) {
2266 #if CONFIG_H261_DECODER
2267  case AV_CODEC_ID_H261:
2268 #endif
2269 #if CONFIG_H263_DECODER
2270  case AV_CODEC_ID_H263:
2271 #endif
2272 #if CONFIG_MPEG4_DECODER
2273  case AV_CODEC_ID_MPEG4:
2274 #endif
2275  st->codec->width = 0; /* let decoder init width/height */
2276  st->codec->height= 0;
2277  break;
2278  }
2279 
2280  /* Do not need those anymore. */
2281  av_freep(&sc->chunk_offsets);
2282  av_freep(&sc->stsc_data);
2283  av_freep(&sc->sample_sizes);
2284  av_freep(&sc->keyframes);
2285  av_freep(&sc->stts_data);
2286  av_freep(&sc->stps_data);
2287  av_freep(&sc->rap_group);
2288 
2289  return 0;
2290 }
2291 
2292 static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2293 {
2294  int ret;
2295  c->itunes_metadata = 1;
2296  ret = mov_read_default(c, pb, atom);
2297  c->itunes_metadata = 0;
2298  return ret;
2299 }
2300 
2301 static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2302 {
2303  while (atom.size > 8) {
2304  uint32_t tag = avio_rl32(pb);
2305  atom.size -= 4;
2306  if (tag == MKTAG('h','d','l','r')) {
2307  avio_seek(pb, -8, SEEK_CUR);
2308  atom.size += 8;
2309  return mov_read_default(c, pb, atom);
2310  }
2311  }
2312  return 0;
2313 }
2314 
2315 static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2316 {
2317  int i;
2318  int width;
2319  int height;
2320  int64_t disp_transform[2];
2321  int display_matrix[3][2];
2322  AVStream *st;
2323  MOVStreamContext *sc;
2324  int version;
2325 
2326  if (c->fc->nb_streams < 1)
2327  return 0;
2328  st = c->fc->streams[c->fc->nb_streams-1];
2329  sc = st->priv_data;
2330 
2331  version = avio_r8(pb);
2332  avio_rb24(pb); /* flags */
2333  /*
2334  MOV_TRACK_ENABLED 0x0001
2335  MOV_TRACK_IN_MOVIE 0x0002
2336  MOV_TRACK_IN_PREVIEW 0x0004
2337  MOV_TRACK_IN_POSTER 0x0008
2338  */
2339 
2340  if (version == 1) {
2341  avio_rb64(pb);
2342  avio_rb64(pb);
2343  } else {
2344  avio_rb32(pb); /* creation time */
2345  avio_rb32(pb); /* modification time */
2346  }
2347  st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/
2348  avio_rb32(pb); /* reserved */
2349 
2350  /* highlevel (considering edits) duration in movie timebase */
2351  (version == 1) ? avio_rb64(pb) : avio_rb32(pb);
2352  avio_rb32(pb); /* reserved */
2353  avio_rb32(pb); /* reserved */
2354 
2355  avio_rb16(pb); /* layer */
2356  avio_rb16(pb); /* alternate group */
2357  avio_rb16(pb); /* volume */
2358  avio_rb16(pb); /* reserved */
2359 
2360  //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)
2361  // they're kept in fixed point format through all calculations
2362  // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio
2363  for (i = 0; i < 3; i++) {
2364  display_matrix[i][0] = avio_rb32(pb); // 16.16 fixed point
2365  display_matrix[i][1] = avio_rb32(pb); // 16.16 fixed point
2366  avio_rb32(pb); // 2.30 fixed point (not used)
2367  }
2368 
2369  width = avio_rb32(pb); // 16.16 fixed point track width
2370  height = avio_rb32(pb); // 16.16 fixed point track height
2371  sc->width = width >> 16;
2372  sc->height = height >> 16;
2373 
2374  //Assign clockwise rotate values based on transform matrix so that
2375  //we can compensate for iPhone orientation during capture.
2376 
2377  if (display_matrix[1][0] == -65536 && display_matrix[0][1] == 65536) {
2378  av_dict_set(&st->metadata, "rotate", "90", 0);
2379  }
2380 
2381  if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {
2382  av_dict_set(&st->metadata, "rotate", "180", 0);
2383  }
2384 
2385  if (display_matrix[1][0] == 65536 && display_matrix[0][1] == -65536) {
2386  av_dict_set(&st->metadata, "rotate", "270", 0);
2387  }
2388 
2389  // transform the display width/height according to the matrix
2390  // skip this if the display matrix is the default identity matrix
2391  // or if it is rotating the picture, ex iPhone 3GS
2392  // to keep the same scale, use [width height 1<<16]
2393  if (width && height &&
2394  ((display_matrix[0][0] != 65536 ||
2395  display_matrix[1][1] != 65536) &&
2396  !display_matrix[0][1] &&
2397  !display_matrix[1][0] &&
2398  !display_matrix[2][0] && !display_matrix[2][1])) {
2399  for (i = 0; i < 2; i++)
2400  disp_transform[i] =
2401  (int64_t) width * display_matrix[0][i] +
2402  (int64_t) height * display_matrix[1][i] +
2403  ((int64_t) display_matrix[2][i] << 16);
2404 
2405  //sample aspect ratio is new width/height divided by old width/height
2406  st->sample_aspect_ratio = av_d2q(
2407  ((double) disp_transform[0] * height) /
2408  ((double) disp_transform[1] * width), INT_MAX);
2409  }
2410  return 0;
2411 }
2412 
2413 static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2414 {
2415  MOVFragment *frag = &c->fragment;
2416  MOVTrackExt *trex = NULL;
2417  int flags, track_id, i;
2418 
2419  avio_r8(pb); /* version */
2420  flags = avio_rb24(pb);
2421 
2422  track_id = avio_rb32(pb);
2423  if (!track_id)
2424  return AVERROR_INVALIDDATA;
2425  frag->track_id = track_id;
2426  for (i = 0; i < c->trex_count; i++)
2427  if (c->trex_data[i].track_id == frag->track_id) {
2428  trex = &c->trex_data[i];
2429  break;
2430  }
2431  if (!trex) {
2432  av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
2433  return AVERROR_INVALIDDATA;
2434  }
2435 
2436  frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?
2437  avio_rb64(pb) : frag->moof_offset;
2438  frag->stsd_id = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;
2439 
2440  frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?
2441  avio_rb32(pb) : trex->duration;
2442  frag->size = flags & MOV_TFHD_DEFAULT_SIZE ?
2443  avio_rb32(pb) : trex->size;
2444  frag->flags = flags & MOV_TFHD_DEFAULT_FLAGS ?
2445  avio_rb32(pb) : trex->flags;
2446  av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);
2447  return 0;
2448 }
2449 
2450 static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2451 {
2452  c->chapter_track = avio_rb32(pb);
2453  return 0;
2454 }
2455 
2456 static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2457 {
2458  MOVTrackExt *trex;
2459 
2460  if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))
2461  return AVERROR_INVALIDDATA;
2462  trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));
2463  if (!trex)
2464  return AVERROR(ENOMEM);
2465 
2466  c->fc->duration = AV_NOPTS_VALUE; // the duration from mvhd is not representing the whole file when fragments are used.
2467 
2468  c->trex_data = trex;
2469  trex = &c->trex_data[c->trex_count++];
2470  avio_r8(pb); /* version */
2471  avio_rb24(pb); /* flags */
2472  trex->track_id = avio_rb32(pb);
2473  trex->stsd_id = avio_rb32(pb);
2474  trex->duration = avio_rb32(pb);
2475  trex->size = avio_rb32(pb);
2476  trex->flags = avio_rb32(pb);
2477  return 0;
2478 }
2479 
2480 static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2481 {
2482  MOVFragment *frag = &c->fragment;
2483  AVStream *st = NULL;
2484  MOVStreamContext *sc;
2485  MOVStts *ctts_data;
2486  uint64_t offset;
2487  int64_t dts;
2488  int data_offset = 0;
2489  unsigned entries, first_sample_flags = frag->flags;
2490  int flags, distance, i, found_keyframe = 0;
2491 
2492  for (i = 0; i < c->fc->nb_streams; i++) {
2493  if (c->fc->streams[i]->id == frag->track_id) {
2494  st = c->fc->streams[i];
2495  break;
2496  }
2497  }
2498  if (!st) {
2499  av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);
2500  return AVERROR_INVALIDDATA;
2501  }
2502  sc = st->priv_data;
2503  if (sc->pseudo_stream_id+1 != frag->stsd_id)
2504  return 0;
2505  avio_r8(pb); /* version */
2506  flags = avio_rb24(pb);
2507  entries = avio_rb32(pb);
2508  av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);
2509 
2510  /* Always assume the presence of composition time offsets.
2511  * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.
2512  * 1) in the initial movie, there are no samples.
2513  * 2) in the first movie fragment, there is only one sample without composition time offset.
2514  * 3) in the subsequent movie fragments, there are samples with composition time offset. */
2515  if (!sc->ctts_count && sc->sample_count)
2516  {
2517  /* Complement ctts table if moov atom doesn't have ctts atom. */
2518  ctts_data = av_malloc(sizeof(*sc->ctts_data));
2519  if (!ctts_data)
2520  return AVERROR(ENOMEM);
2521  sc->ctts_data = ctts_data;
2522  sc->ctts_data[sc->ctts_count].count = sc->sample_count;
2523  sc->ctts_data[sc->ctts_count].duration = 0;
2524  sc->ctts_count++;
2525  }
2526  if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
2527  return AVERROR_INVALIDDATA;
2528  ctts_data = av_realloc(sc->ctts_data,
2529  (entries+sc->ctts_count)*sizeof(*sc->ctts_data));
2530  if (!ctts_data)
2531  return AVERROR(ENOMEM);
2532  sc->ctts_data = ctts_data;
2533 
2534  if (flags & MOV_TRUN_DATA_OFFSET) data_offset = avio_rb32(pb);
2535  if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);
2536  dts = sc->track_end - sc->time_offset;
2537  offset = frag->base_data_offset + data_offset;
2538  distance = 0;
2539  av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);
2540  for (i = 0; i < entries && !pb->eof_reached; i++) {
2541  unsigned sample_size = frag->size;
2542  int sample_flags = i ? frag->flags : first_sample_flags;
2543  unsigned sample_duration = frag->duration;
2544  int keyframe = 0;
2545 
2546  if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);
2547  if (flags & MOV_TRUN_SAMPLE_SIZE) sample_size = avio_rb32(pb);
2548  if (flags & MOV_TRUN_SAMPLE_FLAGS) sample_flags = avio_rb32(pb);
2549  sc->ctts_data[sc->ctts_count].count = 1;
2550  sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?
2551  avio_rb32(pb) : 0;
2552  sc->ctts_count++;
2553  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
2554  keyframe = 1;
2555  else if (!found_keyframe)
2556  keyframe = found_keyframe =
2557  !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |
2558  MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
2559  if (keyframe)
2560  distance = 0;
2561  av_add_index_entry(st, offset, dts, sample_size, distance,
2562  keyframe ? AVINDEX_KEYFRAME : 0);
2563  av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
2564  "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
2565  offset, dts, sample_size, distance, keyframe);
2566  distance++;
2567  dts += sample_duration;
2568  offset += sample_size;
2569  sc->data_size += sample_size;
2570  }
2571 
2572  if (pb->eof_reached)
2573  return AVERROR_EOF;
2574 
2575  frag->moof_offset = offset;
2576  st->duration = sc->track_end = dts + sc->time_offset;
2577  return 0;
2578 }
2579 
2580 /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
2581 /* like the files created with Adobe Premiere 5.0, for samples see */
2582 /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
2583 static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2584 {
2585  int err;
2586 
2587  if (atom.size < 8)
2588  return 0; /* continue */
2589  if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
2590  avio_skip(pb, atom.size - 4);
2591  return 0;
2592  }
2593  atom.type = avio_rl32(pb);
2594  atom.size -= 8;
2595  if (atom.type != MKTAG('m','d','a','t')) {
2596  avio_skip(pb, atom.size);
2597  return 0;
2598  }
2599  err = mov_read_mdat(c, pb, atom);
2600  return err;
2601 }
2602 
2603 static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2604 {
2605 #if CONFIG_ZLIB
2606  AVIOContext ctx;
2607  uint8_t *cmov_data;
2608  uint8_t *moov_data; /* uncompressed data */
2609  long cmov_len, moov_len;
2610  int ret = -1;
2611 
2612  avio_rb32(pb); /* dcom atom */
2613  if (avio_rl32(pb) != MKTAG('d','c','o','m'))
2614  return AVERROR_INVALIDDATA;
2615  if (avio_rl32(pb) != MKTAG('z','l','i','b')) {
2616  av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !\n");
2617  return AVERROR_INVALIDDATA;
2618  }
2619  avio_rb32(pb); /* cmvd atom */
2620  if (avio_rl32(pb) != MKTAG('c','m','v','d'))
2621  return AVERROR_INVALIDDATA;
2622  moov_len = avio_rb32(pb); /* uncompressed size */
2623  cmov_len = atom.size - 6 * 4;
2624 
2625  cmov_data = av_malloc(cmov_len);
2626  if (!cmov_data)
2627  return AVERROR(ENOMEM);
2628  moov_data = av_malloc(moov_len);
2629  if (!moov_data) {
2630  av_free(cmov_data);
2631  return AVERROR(ENOMEM);
2632  }
2633  avio_read(pb, cmov_data, cmov_len);
2634  if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
2635  goto free_and_return;
2636  if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
2637  goto free_and_return;
2638  atom.type = MKTAG('m','o','o','v');
2639  atom.size = moov_len;
2640  ret = mov_read_default(c, &ctx, atom);
2641 free_and_return:
2642  av_free(moov_data);
2643  av_free(cmov_data);
2644  return ret;
2645 #else
2646  av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
2647  return AVERROR(ENOSYS);
2648 #endif
2649 }
2650 
2651 /* edit list atom */
2652 static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2653 {
2654  MOVStreamContext *sc;
2655  int i, edit_count, version, edit_start_index = 0;
2656  int unsupported = 0;
2657 
2658  if (c->fc->nb_streams < 1 || c->ignore_editlist)
2659  return 0;
2660  sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;
2661 
2662  version = avio_r8(pb); /* version */
2663  avio_rb24(pb); /* flags */
2664  edit_count = avio_rb32(pb); /* entries */
2665 
2666  if ((uint64_t)edit_count*12+8 > atom.size)
2667  return AVERROR_INVALIDDATA;
2668 
2669  av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);
2670  for (i=0; i<edit_count; i++){
2671  int64_t time;
2672  int64_t duration;
2673  int rate;
2674  if (version == 1) {
2675  duration = avio_rb64(pb);
2676  time = avio_rb64(pb);
2677  } else {
2678  duration = avio_rb32(pb); /* segment duration */
2679  time = (int32_t)avio_rb32(pb); /* media time */
2680  }
2681  rate = avio_rb32(pb);
2682  if (i == 0 && time == -1) {
2683  sc->empty_duration = duration;
2684  edit_start_index = 1;
2685  } else if (i == edit_start_index && time >= 0)
2686  sc->start_time = time;
2687  else
2688  unsupported = 1;
2689 
2690  av_dlog(c->fc, "duration=%"PRId64" time=%"PRId64" rate=%f\n",
2691  duration, time, rate / 65536.0);
2692  }
2693 
2694  if (unsupported)
2695  av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "
2696  "a/v desync might occur, patch welcome\n");
2697 
2698  return 0;
2699 }
2700 
2701 static int mov_read_tmcd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2702 {
2703  MOVStreamContext *sc;
2704 
2705  if (c->fc->nb_streams < 1)
2706  return AVERROR_INVALIDDATA;
2707  sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;
2708  sc->timecode_track = avio_rb32(pb);
2709  return 0;
2710 }
2711 
2712 static const MOVParseTableEntry mov_default_parse_table[] = {
2713 { MKTAG('A','C','L','R'), mov_read_avid },
2714 { MKTAG('A','P','R','G'), mov_read_avid },
2715 { MKTAG('A','A','L','P'), mov_read_avid },
2716 { MKTAG('A','R','E','S'), mov_read_avid },
2717 { MKTAG('a','v','s','s'), mov_read_avss },
2718 { MKTAG('c','h','p','l'), mov_read_chpl },
2719 { MKTAG('c','o','6','4'), mov_read_stco },
2720 { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */
2721 { MKTAG('d','i','n','f'), mov_read_default },
2722 { MKTAG('d','r','e','f'), mov_read_dref },
2723 { MKTAG('e','d','t','s'), mov_read_default },
2724 { MKTAG('e','l','s','t'), mov_read_elst },
2725 { MKTAG('e','n','d','a'), mov_read_enda },
2726 { MKTAG('f','i','e','l'), mov_read_fiel },
2727 { MKTAG('f','t','y','p'), mov_read_ftyp },
2728 { MKTAG('g','l','b','l'), mov_read_glbl },
2729 { MKTAG('h','d','l','r'), mov_read_hdlr },
2730 { MKTAG('i','l','s','t'), mov_read_ilst },
2731 { MKTAG('j','p','2','h'), mov_read_jp2h },
2732 { MKTAG('m','d','a','t'), mov_read_mdat },
2733 { MKTAG('m','d','h','d'), mov_read_mdhd },
2734 { MKTAG('m','d','i','a'), mov_read_default },
2735 { MKTAG('m','e','t','a'), mov_read_meta },
2736 { MKTAG('m','i','n','f'), mov_read_default },
2737 { MKTAG('m','o','o','f'), mov_read_moof },
2738 { MKTAG('m','o','o','v'), mov_read_moov },
2739 { MKTAG('m','v','e','x'), mov_read_default },
2740 { MKTAG('m','v','h','d'), mov_read_mvhd },
2741 { MKTAG('S','M','I',' '), mov_read_svq3 },
2742 { MKTAG('a','l','a','c'), mov_read_alac }, /* alac specific atom */
2743 { MKTAG('a','v','c','C'), mov_read_glbl },
2744 { MKTAG('p','a','s','p'), mov_read_pasp },
2745 { MKTAG('s','t','b','l'), mov_read_default },
2746 { MKTAG('s','t','c','o'), mov_read_stco },
2747 { MKTAG('s','t','p','s'), mov_read_stps },
2748 { MKTAG('s','t','r','f'), mov_read_strf },
2749 { MKTAG('s','t','s','c'), mov_read_stsc },
2750 { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */
2751 { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */
2752 { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */
2753 { MKTAG('s','t','t','s'), mov_read_stts },
2754 { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */
2755 { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */
2756 { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */
2757 { MKTAG('t','r','a','k'), mov_read_trak },
2758 { MKTAG('t','r','a','f'), mov_read_default },
2759 { MKTAG('t','r','e','f'), mov_read_default },
2760 { MKTAG('t','m','c','d'), mov_read_tmcd },
2761 { MKTAG('c','h','a','p'), mov_read_chap },
2762 { MKTAG('t','r','e','x'), mov_read_trex },
2763 { MKTAG('t','r','u','n'), mov_read_trun },
2764 { MKTAG('u','d','t','a'), mov_read_default },
2765 { MKTAG('w','a','v','e'), mov_read_wave },
2766 { MKTAG('e','s','d','s'), mov_read_esds },
2767 { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */
2768 { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */
2769 { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
2770 { MKTAG('w','f','e','x'), mov_read_wfex },
2771 { MKTAG('c','m','o','v'), mov_read_cmov },
2772 { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */
2773 { MKTAG('d','v','c','1'), mov_read_dvc1 },
2774 { MKTAG('s','b','g','p'), mov_read_sbgp },
2775 { 0, NULL }
2776 };
2777 
2778 static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2779 {
2780  int64_t total_size = 0;
2781  MOVAtom a;
2782  int i;
2783 
2784  if (atom.size < 0)
2785  atom.size = INT64_MAX;
2786  while (total_size + 8 <= atom.size && !url_feof(pb)) {
2787  int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;
2788  a.size = atom.size;
2789  a.type=0;
2790  if (atom.size >= 8) {
2791  a.size = avio_rb32(pb);
2792  a.type = avio_rl32(pb);
2793  if (atom.type != MKTAG('r','o','o','t') &&
2794  atom.type != MKTAG('m','o','o','v'))
2795  {
2796  if (a.type == MKTAG('t','r','a','k') || a.type == MKTAG('m','d','a','t'))
2797  {
2798  av_log(c->fc, AV_LOG_ERROR, "Broken file, trak/mdat not at top-level\n");
2799  avio_skip(pb, -8);
2800  return 0;
2801  }
2802  }
2803  total_size += 8;
2804  if (a.size == 1) { /* 64 bit extended size */
2805  a.size = avio_rb64(pb) - 8;
2806  total_size += 8;
2807  }
2808  }
2809  av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",
2810  a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);
2811  if (a.size == 0) {
2812  a.size = atom.size - total_size + 8;
2813  }
2814  a.size -= 8;
2815  if (a.size < 0)
2816  break;
2817  a.size = FFMIN(a.size, atom.size - total_size);
2818 
2819  for (i = 0; mov_default_parse_table[i].type; i++)
2820  if (mov_default_parse_table[i].type == a.type) {
2821  parse = mov_default_parse_table[i].parse;
2822  break;
2823  }
2824 
2825  // container is user data
2826  if (!parse && (atom.type == MKTAG('u','d','t','a') ||
2827  atom.type == MKTAG('i','l','s','t')))
2828  parse = mov_read_udta_string;
2829 
2830  if (!parse) { /* skip leaf atoms data */
2831  avio_skip(pb, a.size);
2832  } else {
2833  int64_t start_pos = avio_tell(pb);
2834  int64_t left;
2835  int err = parse(c, pb, a);
2836  if (err < 0)
2837  return err;
2838  if (c->found_moov && c->found_mdat &&
2839  ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||
2840  start_pos + a.size == avio_size(pb))) {
2841  if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)
2842  c->next_root_atom = start_pos + a.size;
2843  return 0;
2844  }
2845  left = a.size - avio_tell(pb) + start_pos;
2846  if (left > 0) /* skip garbage at atom end */
2847  avio_skip(pb, left);
2848  else if(left < 0) {
2849  av_log(c->fc, AV_LOG_DEBUG, "undoing overread of %"PRId64" in '%.4s'\n", -left, (char*)&a.type);
2850  avio_seek(pb, left, SEEK_CUR);
2851  }
2852  }
2853 
2854  total_size += a.size;
2855  }
2856 
2857  if (total_size < atom.size && atom.size < 0x7ffff)
2858  avio_skip(pb, atom.size - total_size);
2859 
2860  return 0;
2861 }
2862 
2863 static int mov_probe(AVProbeData *p)
2864 {
2865  int64_t offset;
2866  uint32_t tag;
2867  int score = 0;
2868  int moov_offset = -1;
2869 
2870  /* check file header */
2871  offset = 0;
2872  for (;;) {
2873  /* ignore invalid offset */
2874  if ((offset + 8) > (unsigned int)p->buf_size)
2875  break;
2876  tag = AV_RL32(p->buf + offset + 4);
2877  switch(tag) {
2878  /* check for obvious tags */
2879  case MKTAG('m','o','o','v'):
2880  moov_offset = offset + 4;
2881  case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */
2882  case MKTAG('m','d','a','t'):
2883  case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
2884  case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
2885  case MKTAG('f','t','y','p'):
2886  if (AV_RB32(p->buf+offset) < 8 &&
2887  (AV_RB32(p->buf+offset) != 1 ||
2888  offset + 12 > (unsigned int)p->buf_size ||
2889  AV_RB64(p->buf+offset + 8) == 0)) {
2890  score = FFMAX(score, AVPROBE_SCORE_MAX - 50);
2891  } else {
2892  score = AVPROBE_SCORE_MAX;
2893  }
2894  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2895  break;
2896  /* those are more common words, so rate then a bit less */
2897  case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
2898  case MKTAG('w','i','d','e'):
2899  case MKTAG('f','r','e','e'):
2900  case MKTAG('j','u','n','k'):
2901  case MKTAG('p','i','c','t'):
2902  score = FFMAX(score, AVPROBE_SCORE_MAX - 5);
2903  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2904  break;
2905  case MKTAG(0x82,0x82,0x7f,0x7d):
2906  case MKTAG('s','k','i','p'):
2907  case MKTAG('u','u','i','d'):
2908  case MKTAG('p','r','f','l'):
2909  /* if we only find those cause probedata is too small at least rate them */
2910  score = FFMAX(score, AVPROBE_SCORE_MAX - 50);
2911  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2912  break;
2913  default:
2914  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2915  }
2916  }
2917  if(score > AVPROBE_SCORE_MAX - 50 && moov_offset != -1) {
2918  /* moov atom in the header - we should make sure that this is not a
2919  * MOV-packed MPEG-PS */
2920  offset = moov_offset;
2921 
2922  while(offset < (p->buf_size - 16)){ /* Sufficient space */
2923  /* We found an actual hdlr atom */
2924  if(AV_RL32(p->buf + offset ) == MKTAG('h','d','l','r') &&
2925  AV_RL32(p->buf + offset + 8) == MKTAG('m','h','l','r') &&
2926  AV_RL32(p->buf + offset + 12) == MKTAG('M','P','E','G')){
2927  av_log(NULL, AV_LOG_WARNING, "Found media data tag MPEG indicating this is a MOV-packed MPEG-PS.\n");
2928  /* We found a media handler reference atom describing an
2929  * MPEG-PS-in-MOV, return a
2930  * low score to force expanding the probe window until
2931  * mpegps_probe finds what it needs */
2932  return 5;
2933  }else
2934  /* Keep looking */
2935  offset+=2;
2936  }
2937  }
2938 
2939  return score;
2940 }
2941 
2942 // must be done after parsing all trak because there's no order requirement
2943 static void mov_read_chapters(AVFormatContext *s)
2944 {
2945  MOVContext *mov = s->priv_data;
2946  AVStream *st = NULL;
2947  MOVStreamContext *sc;
2948  int64_t cur_pos;
2949  int i;
2950 
2951  for (i = 0; i < s->nb_streams; i++)
2952  if (s->streams[i]->id == mov->chapter_track) {
2953  st = s->streams[i];
2954  break;
2955  }
2956  if (!st) {
2957  av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
2958  return;
2959  }
2960 
2961  st->discard = AVDISCARD_ALL;
2962  sc = st->priv_data;
2963  cur_pos = avio_tell(sc->pb);
2964 
2965  for (i = 0; i < st->nb_index_entries; i++) {
2966  AVIndexEntry *sample = &st->index_entries[i];
2967  int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
2968  uint8_t *title;
2969  uint16_t ch;
2970  int len, title_len;
2971 
2972  if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
2973  av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);
2974  goto finish;
2975  }
2976 
2977  // the first two bytes are the length of the title
2978  len = avio_rb16(sc->pb);
2979  if (len > sample->size-2)
2980  continue;
2981  title_len = 2*len + 1;
2982  if (!(title = av_mallocz(title_len)))
2983  goto finish;
2984 
2985  // The samples could theoretically be in any encoding if there's an encd
2986  // atom following, but in practice are only utf-8 or utf-16, distinguished
2987  // instead by the presence of a BOM
2988  if (!len) {
2989  title[0] = 0;
2990  } else {
2991  ch = avio_rb16(sc->pb);
2992  if (ch == 0xfeff)
2993  avio_get_str16be(sc->pb, len, title, title_len);
2994  else if (ch == 0xfffe)
2995  avio_get_str16le(sc->pb, len, title, title_len);
2996  else {
2997  AV_WB16(title, ch);
2998  if (len == 1 || len == 2)
2999  title[len] = 0;
3000  else
3001  avio_get_str(sc->pb, INT_MAX, title + 2, len - 1);
3002  }
3003  }
3004 
3005  avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);
3006  av_freep(&title);
3007  }
3008 finish:
3009  avio_seek(sc->pb, cur_pos, SEEK_SET);
3010 }
3011 
3012 static int parse_timecode_in_framenum_format(AVFormatContext *s, AVStream *st,
3013  uint32_t value, int flags)
3014 {
3015  AVTimecode tc;
3016  char buf[AV_TIMECODE_STR_SIZE];
3017  AVRational rate = {st->codec->time_base.den,
3018  st->codec->time_base.num};
3019  int ret = av_timecode_init(&tc, rate, flags, 0, s);
3020  if (ret < 0)
3021  return ret;
3022  av_dict_set(&st->metadata, "timecode",
3023  av_timecode_make_string(&tc, buf, value), 0);
3024  return 0;
3025 }
3026 
3027 static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
3028 {
3029  MOVStreamContext *sc = st->priv_data;
3030  int flags = 0;
3031  int64_t cur_pos = avio_tell(sc->pb);
3032  uint32_t value;
3033 
3034  if (!st->nb_index_entries)
3035  return -1;
3036 
3037  avio_seek(sc->pb, st->index_entries->pos, SEEK_SET);
3038  value = avio_rb32(s->pb);
3039 
3040  if (sc->tmcd_flags & 0x0001) flags |= AV_TIMECODE_FLAG_DROPFRAME;
3041  if (sc->tmcd_flags & 0x0002) flags |= AV_TIMECODE_FLAG_24HOURSMAX;
3042  if (sc->tmcd_flags & 0x0004) flags |= AV_TIMECODE_FLAG_ALLOWNEGATIVE;
3043 
3044  /* Assume Counter flag is set to 1 in tmcd track (even though it is likely
3045  * not the case) and thus assume "frame number format" instead of QT one.
3046  * No sample with tmcd track can be found with a QT timecode at the moment,
3047  * despite what the tmcd track "suggests" (Counter flag set to 0 means QT
3048  * format). */
3049  parse_timecode_in_framenum_format(s, st, value, flags);
3050 
3051  avio_seek(sc->pb, cur_pos, SEEK_SET);
3052  return 0;
3053 }
3054 
3055 static int mov_read_close(AVFormatContext *s)
3056 {
3057  MOVContext *mov = s->priv_data;
3058  int i, j;
3059 
3060  for (i = 0; i < s->nb_streams; i++) {
3061  AVStream *st = s->streams[i];
3062  MOVStreamContext *sc = st->priv_data;
3063 
3064  av_freep(&sc->ctts_data);
3065  for (j = 0; j < sc->drefs_count; j++) {
3066  av_freep(&sc->drefs[j].path);
3067  av_freep(&sc->drefs[j].dir);
3068  }
3069  av_freep(&sc->drefs);
3070  if (!sc->pb_is_copied)
3071  avio_close(sc->pb);
3072  sc->pb = NULL;
3073  av_freep(&sc->chunk_offsets);
3074  av_freep(&sc->keyframes);
3075  av_freep(&sc->sample_sizes);
3076  av_freep(&sc->stps_data);
3077  av_freep(&sc->stsc_data);
3078  av_freep(&sc->stts_data);
3079  }
3080 
3081  if (mov->dv_demux) {
3082  for (i = 0; i < mov->dv_fctx->nb_streams; i++) {
3083  av_freep(&mov->dv_fctx->streams[i]->codec);
3084  av_freep(&mov->dv_fctx->streams[i]);
3085  }
3086  av_freep(&mov->dv_fctx);
3087  av_freep(&mov->dv_demux);
3088  }
3089 
3090  av_freep(&mov->trex_data);
3091 
3092  return 0;
3093 }
3094 
3095 static int tmcd_is_referenced(AVFormatContext *s, int tmcd_id)
3096 {
3097  int i;
3098 
3099  for (i = 0; i < s->nb_streams; i++) {
3100  AVStream *st = s->streams[i];
3101  MOVStreamContext *sc = st->priv_data;
3102 
3103  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
3104  sc->timecode_track == tmcd_id)
3105  return 1;
3106  }
3107  return 0;
3108 }
3109 
3110 /* look for a tmcd track not referenced by any video track, and export it globally */
3111 static void export_orphan_timecode(AVFormatContext *s)
3112 {
3113  int i;
3114 
3115  for (i = 0; i < s->nb_streams; i++) {
3116  AVStream *st = s->streams[i];
3117 
3118  if (st->codec->codec_tag == MKTAG('t','m','c','d') &&
3119  !tmcd_is_referenced(s, i + 1)) {
3120  AVDictionaryEntry *tcr = av_dict_get(st->metadata, "timecode", NULL, 0);
3121  if (tcr) {
3122  av_dict_set(&s->metadata, "timecode", tcr->value, 0);
3123  break;
3124  }
3125  }
3126  }
3127 }
3128 
3129 static int mov_read_header(AVFormatContext *s)
3130 {
3131  MOVContext *mov = s->priv_data;
3132  AVIOContext *pb = s->pb;
3133  int i, j, err;
3134  MOVAtom atom = { AV_RL32("root") };
3135 
3136  mov->fc = s;
3137  /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
3138  if (pb->seekable)
3139  atom.size = avio_size(pb);
3140  else
3141  atom.size = INT64_MAX;
3142 
3143  /* check MOV header */
3144  if ((err = mov_read_default(mov, pb, atom)) < 0) {
3145  av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);
3146  mov_read_close(s);
3147  return err;
3148  }
3149  if (!mov->found_moov) {
3150  av_log(s, AV_LOG_ERROR, "moov atom not found\n");
3151  mov_read_close(s);
3152  return AVERROR_INVALIDDATA;
3153  }
3154  av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));
3155 
3156  if (pb->seekable) {
3157  if (mov->chapter_track > 0)
3158  mov_read_chapters(s);
3159  for (i = 0; i < s->nb_streams; i++)
3160  if (s->streams[i]->codec->codec_tag == AV_RL32("tmcd"))
3161  mov_read_timecode_track(s, s->streams[i]);
3162  }
3163 
3164  /* copy timecode metadata from tmcd tracks to the related video streams */
3165  for (i = 0; i < s->nb_streams; i++) {
3166  AVStream *st = s->streams[i];
3167  MOVStreamContext *sc = st->priv_data;
3168  if (sc->timecode_track > 0) {
3169  AVDictionaryEntry *tcr;
3170  int tmcd_st_id = -1;
3171 
3172  for (j = 0; j < s->nb_streams; j++)
3173  if (s->streams[j]->id == sc->timecode_track)
3174  tmcd_st_id = j;
3175 
3176  if (tmcd_st_id < 0 || tmcd_st_id == i)
3177  continue;
3178  tcr = av_dict_get(s->streams[tmcd_st_id]->metadata, "timecode", NULL, 0);
3179  if (tcr)
3180  av_dict_set(&st->metadata, "timecode", tcr->value, 0);
3181  }
3182  }
3183  export_orphan_timecode(s);
3184 
3185  for (i = 0; i < s->nb_streams; i++) {
3186  AVStream *st = s->streams[i];
3187  MOVStreamContext *sc = st->priv_data;
3188  fix_timescale(mov, sc);
3189  if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->codec_id == AV_CODEC_ID_AAC) {
3190  st->skip_samples = sc->start_pad;
3191  }
3192  }
3193 
3194  if (mov->trex_data) {
3195  for (i = 0; i < s->nb_streams; i++) {
3196  AVStream *st = s->streams[i];
3197  MOVStreamContext *sc = st->priv_data;
3198  if (st->duration)
3199  st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;
3200  }
3201  }
3202 
3203  return 0;
3204 }
3205 
3206 static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
3207 {
3208  AVIndexEntry *sample = NULL;
3209  int64_t best_dts = INT64_MAX;
3210  int i;
3211  for (i = 0; i < s->nb_streams; i++) {
3212  AVStream *avst = s->streams[i];
3213  MOVStreamContext *msc = avst->priv_data;
3214  if (msc->pb && msc->current_sample < avst->nb_index_entries) {
3215  AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
3216  int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
3217  av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
3218  if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||
3219  (s->pb->seekable &&
3220  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
3221  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
3222  (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
3223  sample = current_sample;
3224  best_dts = dts;
3225  *st = avst;
3226  }
3227  }
3228  }
3229  return sample;
3230 }
3231 
3232 static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
3233 {
3234  MOVContext *mov = s->priv_data;
3235  MOVStreamContext *sc;
3236  AVIndexEntry *sample;
3237  AVStream *st = NULL;
3238  int ret;
3239  mov->fc = s;
3240  retry:
3241  sample = mov_find_next_sample(s, &st);
3242  if (!sample) {
3243  mov->found_mdat = 0;
3244  if (!mov->next_root_atom)
3245  return AVERROR_EOF;
3246  avio_seek(s->pb, mov->next_root_atom, SEEK_SET);
3247  mov->next_root_atom = 0;
3248  if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
3249  url_feof(s->pb))
3250  return AVERROR_EOF;
3251  av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
3252  goto retry;
3253  }
3254  sc = st->priv_data;
3255  /* must be done just before reading, to avoid infinite loop on sample */
3256  sc->current_sample++;
3257 
3258  if (st->discard != AVDISCARD_ALL) {
3259  if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
3260  av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
3261  sc->ffindex, sample->pos);
3262  return AVERROR_INVALIDDATA;
3263  }
3264  ret = av_get_packet(sc->pb, pkt, sample->size);
3265  if (ret < 0)
3266  return ret;
3267  if (sc->has_palette) {
3268  uint8_t *pal;
3269 
3270  pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
3271  if (!pal) {
3272  av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");
3273  } else {
3274  memcpy(pal, sc->palette, AVPALETTE_SIZE);
3275  sc->has_palette = 0;
3276  }
3277  }
3278 #if CONFIG_DV_DEMUXER
3279  if (mov->dv_demux && sc->dv_audio_container) {
3280  avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size, pkt->pos);
3281  av_free(pkt->data);
3282  pkt->size = 0;
3283  ret = avpriv_dv_get_packet(mov->dv_demux, pkt);
3284  if (ret < 0)
3285  return ret;
3286  }
3287 #endif
3288  }
3289 
3290  pkt->stream_index = sc->ffindex;
3291  pkt->dts = sample->timestamp;
3292  if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {
3293  pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
3294  /* update ctts context */
3295  sc->ctts_sample++;
3296  if (sc->ctts_index < sc->ctts_count &&
3297  sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
3298  sc->ctts_index++;
3299  sc->ctts_sample = 0;
3300  }
3301  if (sc->wrong_dts)
3302  pkt->dts = AV_NOPTS_VALUE;
3303  } else {
3304  int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?
3305  st->index_entries[sc->current_sample].timestamp : st->duration;
3306  pkt->duration = next_dts - pkt->dts;
3307  pkt->pts = pkt->dts;
3308  }
3309  if (st->discard == AVDISCARD_ALL)
3310  goto retry;
3311  pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
3312  pkt->pos = sample->pos;
3313  av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",
3314  pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
3315  return 0;
3316 }
3317 
3318 static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
3319 {
3320  MOVStreamContext *sc = st->priv_data;
3321  int sample, time_sample;
3322  int i;
3323 
3324  sample = av_index_search_timestamp(st, timestamp, flags);
3325  av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
3326  if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)
3327  sample = 0;
3328  if (sample < 0) /* not sure what to do */
3329  return AVERROR_INVALIDDATA;
3330  sc->current_sample = sample;
3331  av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);
3332  /* adjust ctts index */
3333  if (sc->ctts_data) {
3334  time_sample = 0;
3335  for (i = 0; i < sc->ctts_count; i++) {
3336  int next = time_sample + sc->ctts_data[i].count;
3337  if (next > sc->current_sample) {
3338  sc->ctts_index = i;
3339  sc->ctts_sample = sc->current_sample - time_sample;
3340  break;
3341  }
3342  time_sample = next;
3343  }
3344  }
3345  return sample;
3346 }
3347 
3348 static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
3349 {
3350  AVStream *st;
3351  int64_t seek_timestamp, timestamp;
3352  int sample;
3353  int i;
3354 
3355  if (stream_index >= s->nb_streams)
3356  return AVERROR_INVALIDDATA;
3357 
3358  st = s->streams[stream_index];
3359  sample = mov_seek_stream(s, st, sample_time, flags);
3360  if (sample < 0)
3361  return sample;
3362 
3363  /* adjust seek timestamp to found sample timestamp */
3364  seek_timestamp = st->index_entries[sample].timestamp;
3365 
3366  for (i = 0; i < s->nb_streams; i++) {
3367  MOVStreamContext *sc = s->streams[i]->priv_data;
3368  st = s->streams[i];
3369  st->skip_samples = (sample_time <= 0) ? sc->start_pad : 0;
3370 
3371  if (stream_index == i)
3372  continue;
3373 
3374  timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
3375  mov_seek_stream(s, st, timestamp, flags);
3376  }
3377  return 0;
3378 }
3379 
3380 static const AVOption options[] = {
3381  {"use_absolute_path",
3382  "allow using absolute path when opening alias, this is a possible security issue",
3383  offsetof(MOVContext, use_absolute_path), FF_OPT_TYPE_INT, {.i64 = 0},
3384  0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},
3385  {"ignore_editlist", "", offsetof(MOVContext, ignore_editlist), FF_OPT_TYPE_INT, {.i64 = 0},
3386  0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},
3387  {NULL}
3388 };
3389 
3390 static const AVClass class = {
3391  .class_name = "mov,mp4,m4a,3gp,3g2,mj2",
3392  .item_name = av_default_item_name,
3393  .option = options,
3394  .version = LIBAVUTIL_VERSION_INT,
3395 };
3396 
3397 AVInputFormat ff_mov_demuxer = {
3398  .name = "mov,mp4,m4a,3gp,3g2,mj2",
3399  .long_name = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),
3400  .priv_data_size = sizeof(MOVContext),
3401  .read_probe = mov_probe,
3402  .read_header = mov_read_header,
3403  .read_packet = mov_read_packet,
3404  .read_close = mov_read_close,
3405  .read_seek = mov_read_seek,
3406  .priv_class = &class,
3407  .flags = AVFMT_NO_BYTE_SEEK,
3408 };
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