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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  * first version by Francois Revol <revol@free.fr>
7  * seek function by Gael Chardon <gael.dev@4now.net>
8  *
9  * This file is part of FFmpeg.
10  *
11  * FFmpeg is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU Lesser General Public
13  * License as published by the Free Software Foundation; either
14  * version 2.1 of the License, or (at your option) any later version.
15  *
16  * FFmpeg is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with FFmpeg; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24  */
25 
26 #include <limits.h>
27 
28 //#define MOV_EXPORT_ALL_METADATA
29 
30 #include "libavutil/attributes.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/intfloat.h"
34 #include "libavutil/mathematics.h"
35 #include "libavutil/avstring.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/timecode.h"
39 #include "libavcodec/ac3tab.h"
40 #include "avformat.h"
41 #include "internal.h"
42 #include "avio_internal.h"
43 #include "riff.h"
44 #include "isom.h"
45 #include "libavcodec/get_bits.h"
46 #include "id3v1.h"
47 #include "mov_chan.h"
48 
49 #if CONFIG_ZLIB
50 #include <zlib.h>
51 #endif
52 
53 #include "qtpalette.h"
54 
55 
56 #undef NDEBUG
57 #include <assert.h>
58 
59 /* those functions parse an atom */
60 /* links atom IDs to parse functions */
61 typedef struct MOVParseTableEntry {
62  uint32_t type;
63  int (*parse)(MOVContext *ctx, AVIOContext *pb, MOVAtom atom);
64 } MOVParseTableEntry;
65 
66 static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom);
67 
68 static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
69  unsigned len, const char *key)
70 {
71  char buf[16];
72 
73  short current, total = 0;
74  avio_rb16(pb); // unknown
75  current = avio_rb16(pb);
76  if (len >= 6)
77  total = avio_rb16(pb);
78  if (!total)
79  snprintf(buf, sizeof(buf), "%d", current);
80  else
81  snprintf(buf, sizeof(buf), "%d/%d", current, total);
82  av_dict_set(&c->fc->metadata, key, buf, 0);
83 
84  return 0;
85 }
86 
87 static int mov_metadata_int8_bypass_padding(MOVContext *c, AVIOContext *pb,
88  unsigned len, const char *key)
89 {
90  char buf[16];
91 
92  /* bypass padding bytes */
93  avio_r8(pb);
94  avio_r8(pb);
95  avio_r8(pb);
96 
97  snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
98  av_dict_set(&c->fc->metadata, key, buf, 0);
99 
100  return 0;
101 }
102 
103 static int mov_metadata_int8_no_padding(MOVContext *c, AVIOContext *pb,
104  unsigned len, const char *key)
105 {
106  char buf[16];
107 
108  snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
109  av_dict_set(&c->fc->metadata, key, buf, 0);
110 
111  return 0;
112 }
113 
114 static int mov_metadata_gnre(MOVContext *c, AVIOContext *pb,
115  unsigned len, const char *key)
116 {
117  short genre;
118  char buf[20];
119 
120  avio_r8(pb); // unknown
121 
122  genre = avio_r8(pb);
123  if (genre < 1 || genre > ID3v1_GENRE_MAX)
124  return 0;
125  snprintf(buf, sizeof(buf), "%s", ff_id3v1_genre_str[genre-1]);
126  av_dict_set(&c->fc->metadata, key, buf, 0);
127 
128  return 0;
129 }
130 
131 static int mov_read_custom_metadata(MOVContext *c, AVIOContext *pb, MOVAtom atom)
132 {
133  char key[1024]={0}, data[1024]={0};
134  int i;
135  AVStream *st;
136  MOVStreamContext *sc;
137 
138  if (c->fc->nb_streams < 1)
139  return 0;
140  st = c->fc->streams[c->fc->nb_streams-1];
141  sc = st->priv_data;
142 
143  if (atom.size <= 8) return 0;
144 
145  for (i = 0; i < 3; i++) { // Parse up to three sub-atoms looking for name and data.
146  int data_size = avio_rb32(pb);
147  int tag = avio_rl32(pb);
148  int str_size = 0, skip_size = 0;
149  char *target = NULL;
150 
151  switch (tag) {
152  case MKTAG('n','a','m','e'):
153  avio_rb32(pb); // version/flags
154  str_size = skip_size = data_size - 12;
155  atom.size -= 12;
156  target = key;
157  break;
158  case MKTAG('d','a','t','a'):
159  avio_rb32(pb); // version/flags
160  avio_rb32(pb); // reserved (zero)
161  str_size = skip_size = data_size - 16;
162  atom.size -= 16;
163  target = data;
164  break;
165  default:
166  skip_size = data_size - 8;
167  str_size = 0;
168  break;
169  }
170 
171  if (target) {
172  str_size = FFMIN3(sizeof(data)-1, str_size, atom.size);
173  avio_read(pb, target, str_size);
174  target[str_size] = 0;
175  }
176  atom.size -= skip_size;
177 
178  // If we didn't read the full data chunk for the sub-atom, skip to the end of it.
179  if (skip_size > str_size) avio_skip(pb, skip_size - str_size);
180  }
181 
182  if (*key && *data) {
183  if (strcmp(key, "iTunSMPB") == 0) {
184  int priming, remainder, samples;
185  if(sscanf(data, "%*X %X %X %X", &priming, &remainder, &samples) == 3){
186  if(priming>0 && priming<16384)
187  sc->start_pad = priming;
188  return 1;
189  }
190  }
191  if (strcmp(key, "cdec") == 0) {
192 // av_dict_set(&st->metadata, key, data, 0);
193  return 1;
194  }
195  }
196  return 0;
197 }
198 
199 static const uint32_t mac_to_unicode[128] = {
200  0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,
201  0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,
202  0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,
203  0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,
204  0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,
205  0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,
206  0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,
207  0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,
208  0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,
209  0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,
210  0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,
211  0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,
212  0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,
213  0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,
214  0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,
215  0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,
216 };
217 
218 static int mov_read_mac_string(MOVContext *c, AVIOContext *pb, int len,
219  char *dst, int dstlen)
220 {
221  char *p = dst;
222  char *end = dst+dstlen-1;
223  int i;
224 
225  for (i = 0; i < len; i++) {
226  uint8_t t, c = avio_r8(pb);
227  if (c < 0x80 && p < end)
228  *p++ = c;
229  else if (p < end)
230  PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);
231  }
232  *p = 0;
233  return p - dst;
234 }
235 
236 static int mov_read_covr(MOVContext *c, AVIOContext *pb, int type, int len)
237 {
238  AVPacket pkt;
239  AVStream *st;
240  MOVStreamContext *sc;
241  enum AVCodecID id;
242  int ret;
243 
244  switch (type) {
245  case 0xd: id = AV_CODEC_ID_MJPEG; break;
246  case 0xe: id = AV_CODEC_ID_PNG; break;
247  case 0x1b: id = AV_CODEC_ID_BMP; break;
248  default:
249  av_log(c->fc, AV_LOG_WARNING, "Unknown cover type: 0x%x.\n", type);
250  avio_skip(pb, len);
251  return 0;
252  }
253 
254  st = avformat_new_stream(c->fc, NULL);
255  if (!st)
256  return AVERROR(ENOMEM);
257  sc = av_mallocz(sizeof(*sc));
258  if (!sc)
259  return AVERROR(ENOMEM);
260  st->priv_data = sc;
261 
262  ret = av_get_packet(pb, &pkt, len);
263  if (ret < 0)
264  return ret;
265 
266  st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
267 
268  st->attached_pic = pkt;
269  st->attached_pic.stream_index = st->index;
270  st->attached_pic.flags |= AV_PKT_FLAG_KEY;
271 
272  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
273  st->codec->codec_id = id;
274 
275  return 0;
276 }
277 
278 static int mov_metadata_raw(MOVContext *c, AVIOContext *pb,
279  unsigned len, const char *key)
280 {
281  char *value = av_malloc(len + 1);
282  if (!value)
283  return AVERROR(ENOMEM);
284  avio_read(pb, value, len);
285  value[len] = 0;
286  return av_dict_set(&c->fc->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
287 }
288 
289 static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
290 {
291 #ifdef MOV_EXPORT_ALL_METADATA
292  char tmp_key[5];
293 #endif
294  char str[1024], key2[16], language[4] = {0};
295  const char *key = NULL;
296  uint16_t langcode = 0;
297  uint32_t data_type = 0, str_size;
298  int (*parse)(MOVContext*, AVIOContext*, unsigned, const char*) = NULL;
299 
300  if (c->itunes_metadata && atom.type == MKTAG('-','-','-','-'))
301  return mov_read_custom_metadata(c, pb, atom);
302 
303  switch (atom.type) {
304  case MKTAG(0xa9,'n','a','m'): key = "title"; break;
305  case MKTAG(0xa9,'a','u','t'):
306  case MKTAG(0xa9,'A','R','T'): key = "artist"; break;
307  case MKTAG( 'a','A','R','T'): key = "album_artist"; break;
308  case MKTAG(0xa9,'w','r','t'): key = "composer"; break;
309  case MKTAG( 'c','p','r','t'):
310  case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;
311  case MKTAG(0xa9,'g','r','p'): key = "grouping"; break;
312  case MKTAG(0xa9,'l','y','r'): key = "lyrics"; break;
313  case MKTAG(0xa9,'c','m','t'):
314  case MKTAG(0xa9,'i','n','f'): key = "comment"; break;
315  case MKTAG(0xa9,'a','l','b'): key = "album"; break;
316  case MKTAG(0xa9,'d','a','y'): key = "date"; break;
317  case MKTAG(0xa9,'g','e','n'): key = "genre"; break;
318  case MKTAG( 'g','n','r','e'): key = "genre";
319  parse = mov_metadata_gnre; break;
320  case MKTAG(0xa9,'t','o','o'):
321  case MKTAG(0xa9,'s','w','r'): key = "encoder"; break;
322  case MKTAG(0xa9,'e','n','c'): key = "encoder"; break;
323  case MKTAG(0xa9,'m','a','k'): key = "make"; break;
324  case MKTAG(0xa9,'m','o','d'): key = "model"; break;
325  case MKTAG(0xa9,'x','y','z'): key = "location"; break;
326  case MKTAG( 'd','e','s','c'): key = "description";break;
327  case MKTAG( 'l','d','e','s'): key = "synopsis"; break;
328  case MKTAG( 't','v','s','h'): key = "show"; break;
329  case MKTAG( 't','v','e','n'): key = "episode_id";break;
330  case MKTAG( 't','v','n','n'): key = "network"; break;
331  case MKTAG( 't','r','k','n'): key = "track";
332  parse = mov_metadata_track_or_disc_number; break;
333  case MKTAG( 'd','i','s','k'): key = "disc";
334  parse = mov_metadata_track_or_disc_number; break;
335  case MKTAG( 't','v','e','s'): key = "episode_sort";
336  parse = mov_metadata_int8_bypass_padding; break;
337  case MKTAG( 't','v','s','n'): key = "season_number";
338  parse = mov_metadata_int8_bypass_padding; break;
339  case MKTAG( 's','t','i','k'): key = "media_type";
340  parse = mov_metadata_int8_no_padding; break;
341  case MKTAG( 'h','d','v','d'): key = "hd_video";
342  parse = mov_metadata_int8_no_padding; break;
343  case MKTAG( 'p','g','a','p'): key = "gapless_playback";
344  parse = mov_metadata_int8_no_padding; break;
345  case MKTAG( '@','P','R','M'):
346  return mov_metadata_raw(c, pb, atom.size, "premiere_version");
347  case MKTAG( '@','P','R','Q'):
348  return mov_metadata_raw(c, pb, atom.size, "quicktime_version");
349  }
350 
351  if (c->itunes_metadata && atom.size > 8) {
352  int data_size = avio_rb32(pb);
353  int tag = avio_rl32(pb);
354  if (tag == MKTAG('d','a','t','a')) {
355  data_type = avio_rb32(pb); // type
356  avio_rb32(pb); // unknown
357  str_size = data_size - 16;
358  atom.size -= 16;
359 
360  if (atom.type == MKTAG('c', 'o', 'v', 'r')) {
361  int ret = mov_read_covr(c, pb, data_type, str_size);
362  if (ret < 0) {
363  av_log(c->fc, AV_LOG_ERROR, "Error parsing cover art.\n");
364  return ret;
365  }
366  }
367  } else return 0;
368  } else if (atom.size > 4 && key && !c->itunes_metadata) {
369  str_size = avio_rb16(pb); // string length
370  langcode = avio_rb16(pb);
371  ff_mov_lang_to_iso639(langcode, language);
372  atom.size -= 4;
373  } else
374  str_size = atom.size;
375 
376 #ifdef MOV_EXPORT_ALL_METADATA
377  if (!key) {
378  snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);
379  key = tmp_key;
380  }
381 #endif
382 
383  if (!key)
384  return 0;
385  if (atom.size < 0)
386  return AVERROR_INVALIDDATA;
387 
388  str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);
389 
390  if (parse)
391  parse(c, pb, str_size, key);
392  else {
393  if (data_type == 3 || (data_type == 0 && (langcode < 0x400 || langcode == 0x7fff))) { // MAC Encoded
394  mov_read_mac_string(c, pb, str_size, str, sizeof(str));
395  } else {
396  avio_read(pb, str, str_size);
397  str[str_size] = 0;
398  }
399  av_dict_set(&c->fc->metadata, key, str, 0);
400  if (*language && strcmp(language, "und")) {
401  snprintf(key2, sizeof(key2), "%s-%s", key, language);
402  av_dict_set(&c->fc->metadata, key2, str, 0);
403  }
404  }
405  av_dlog(c->fc, "lang \"%3s\" ", language);
406  av_dlog(c->fc, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %"PRId64"\n",
407  key, str, (char*)&atom.type, str_size, atom.size);
408 
409  return 0;
410 }
411 
412 static int mov_read_chpl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
413 {
414  int64_t start;
415  int i, nb_chapters, str_len, version;
416  char str[256+1];
417 
418  if ((atom.size -= 5) < 0)
419  return 0;
420 
421  version = avio_r8(pb);
422  avio_rb24(pb);
423  if (version)
424  avio_rb32(pb); // ???
425  nb_chapters = avio_r8(pb);
426 
427  for (i = 0; i < nb_chapters; i++) {
428  if (atom.size < 9)
429  return 0;
430 
431  start = avio_rb64(pb);
432  str_len = avio_r8(pb);
433 
434  if ((atom.size -= 9+str_len) < 0)
435  return 0;
436 
437  avio_read(pb, str, str_len);
438  str[str_len] = 0;
439  avpriv_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);
440  }
441  return 0;
442 }
443 
444 #define MIN_DATA_ENTRY_BOX_SIZE 12
445 static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
446 {
447  AVStream *st;
448  MOVStreamContext *sc;
449  int entries, i, j;
450 
451  if (c->fc->nb_streams < 1)
452  return 0;
453  st = c->fc->streams[c->fc->nb_streams-1];
454  sc = st->priv_data;
455 
456  avio_rb32(pb); // version + flags
457  entries = avio_rb32(pb);
458  if (entries > (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||
459  entries >= UINT_MAX / sizeof(*sc->drefs))
460  return AVERROR_INVALIDDATA;
461  av_free(sc->drefs);
462  sc->drefs_count = 0;
463  sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
464  if (!sc->drefs)
465  return AVERROR(ENOMEM);
466  sc->drefs_count = entries;
467 
468  for (i = 0; i < sc->drefs_count; i++) {
469  MOVDref *dref = &sc->drefs[i];
470  uint32_t size = avio_rb32(pb);
471  int64_t next = avio_tell(pb) + size - 4;
472 
473  if (size < 12)
474  return AVERROR_INVALIDDATA;
475 
476  dref->type = avio_rl32(pb);
477  avio_rb32(pb); // version + flags
478  av_dlog(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);
479 
480  if (dref->type == MKTAG('a','l','i','s') && size > 150) {
481  /* macintosh alias record */
482  uint16_t volume_len, len;
483  int16_t type;
484 
485  avio_skip(pb, 10);
486 
487  volume_len = avio_r8(pb);
488  volume_len = FFMIN(volume_len, 27);
489  avio_read(pb, dref->volume, 27);
490  dref->volume[volume_len] = 0;
491  av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);
492 
493  avio_skip(pb, 12);
494 
495  len = avio_r8(pb);
496  len = FFMIN(len, 63);
497  avio_read(pb, dref->filename, 63);
498  dref->filename[len] = 0;
499  av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);
500 
501  avio_skip(pb, 16);
502 
503  /* read next level up_from_alias/down_to_target */
504  dref->nlvl_from = avio_rb16(pb);
505  dref->nlvl_to = avio_rb16(pb);
506  av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
507  dref->nlvl_from, dref->nlvl_to);
508 
509  avio_skip(pb, 16);
510 
511  for (type = 0; type != -1 && avio_tell(pb) < next; ) {
512  if(url_feof(pb))
513  return AVERROR_EOF;
514  type = avio_rb16(pb);
515  len = avio_rb16(pb);
516  av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
517  if (len&1)
518  len += 1;
519  if (type == 2) { // absolute path
520  av_free(dref->path);
521  dref->path = av_mallocz(len+1);
522  if (!dref->path)
523  return AVERROR(ENOMEM);
524  avio_read(pb, dref->path, len);
525  if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
526  len -= volume_len;
527  memmove(dref->path, dref->path+volume_len, len);
528  dref->path[len] = 0;
529  }
530  for (j = 0; j < len; j++)
531  if (dref->path[j] == ':')
532  dref->path[j] = '/';
533  av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
534  } else if (type == 0) { // directory name
535  av_free(dref->dir);
536  dref->dir = av_malloc(len+1);
537  if (!dref->dir)
538  return AVERROR(ENOMEM);
539  avio_read(pb, dref->dir, len);
540  dref->dir[len] = 0;
541  for (j = 0; j < len; j++)
542  if (dref->dir[j] == ':')
543  dref->dir[j] = '/';
544  av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
545  } else
546  avio_skip(pb, len);
547  }
548  }
549  avio_seek(pb, next, SEEK_SET);
550  }
551  return 0;
552 }
553 
554 static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
555 {
556  AVStream *st;
557  uint32_t type;
558  uint32_t av_unused ctype;
559  int title_size;
560  char *title_str;
561 
562  if (c->fc->nb_streams < 1) // meta before first trak
563  return 0;
564 
565  st = c->fc->streams[c->fc->nb_streams-1];
566 
567  avio_r8(pb); /* version */
568  avio_rb24(pb); /* flags */
569 
570  /* component type */
571  ctype = avio_rl32(pb);
572  type = avio_rl32(pb); /* component subtype */
573 
574  av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
575  av_dlog(c->fc, "stype= %.4s\n", (char*)&type);
576 
577  if (type == MKTAG('v','i','d','e'))
578  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
579  else if (type == MKTAG('s','o','u','n'))
580  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
581  else if (type == MKTAG('m','1','a',' '))
582  st->codec->codec_id = AV_CODEC_ID_MP2;
583  else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))
584  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
585 
586  avio_rb32(pb); /* component manufacture */
587  avio_rb32(pb); /* component flags */
588  avio_rb32(pb); /* component flags mask */
589 
590  title_size = atom.size - 24;
591  if (title_size > 0) {
592  title_str = av_malloc(title_size + 1); /* Add null terminator */
593  if (!title_str)
594  return AVERROR(ENOMEM);
595  avio_read(pb, title_str, title_size);
596  title_str[title_size] = 0;
597  if (title_str[0])
598  av_dict_set(&st->metadata, "handler_name", title_str +
599  (!c->isom && title_str[0] == title_size - 1), 0);
600  av_freep(&title_str);
601  }
602 
603  return 0;
604 }
605 
606 int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
607 {
608  AVStream *st;
609  int tag;
610 
611  if (fc->nb_streams < 1)
612  return 0;
613  st = fc->streams[fc->nb_streams-1];
614 
615  avio_rb32(pb); /* version + flags */
616  ff_mp4_read_descr(fc, pb, &tag);
617  if (tag == MP4ESDescrTag) {
618  ff_mp4_parse_es_descr(pb, NULL);
619  } else
620  avio_rb16(pb); /* ID */
621 
622  ff_mp4_read_descr(fc, pb, &tag);
623  if (tag == MP4DecConfigDescrTag)
624  ff_mp4_read_dec_config_descr(fc, st, pb);
625  return 0;
626 }
627 
628 static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)
629 {
630  return ff_mov_read_esds(c->fc, pb, atom);
631 }
632 
633 static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
634 {
635  AVStream *st;
636  int ac3info, acmod, lfeon, bsmod;
637 
638  if (c->fc->nb_streams < 1)
639  return 0;
640  st = c->fc->streams[c->fc->nb_streams-1];
641 
642  ac3info = avio_rb24(pb);
643  bsmod = (ac3info >> 14) & 0x7;
644  acmod = (ac3info >> 11) & 0x7;
645  lfeon = (ac3info >> 10) & 0x1;
646  st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
647  st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
648  if (lfeon)
649  st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
650  st->codec->audio_service_type = bsmod;
651  if (st->codec->channels > 1 && bsmod == 0x7)
652  st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
653 
654  return 0;
655 }
656 
657 static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
658 {
659  AVStream *st;
660  int eac3info, acmod, lfeon, bsmod;
661 
662  if (c->fc->nb_streams < 1)
663  return 0;
664  st = c->fc->streams[c->fc->nb_streams-1];
665 
666  /* No need to parse fields for additional independent substreams and its
667  * associated dependent substreams since libavcodec's E-AC-3 decoder
668  * does not support them yet. */
669  avio_rb16(pb); /* data_rate and num_ind_sub */
670  eac3info = avio_rb24(pb);
671  bsmod = (eac3info >> 12) & 0x1f;
672  acmod = (eac3info >> 9) & 0x7;
673  lfeon = (eac3info >> 8) & 0x1;
674  st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
675  if (lfeon)
676  st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
677  st->codec->channels = av_get_channel_layout_nb_channels(st->codec->channel_layout);
678  st->codec->audio_service_type = bsmod;
679  if (st->codec->channels > 1 && bsmod == 0x7)
680  st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
681 
682  return 0;
683 }
684 
685 static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
686 {
687  AVStream *st;
688 
689  if (c->fc->nb_streams < 1)
690  return 0;
691  st = c->fc->streams[c->fc->nb_streams-1];
692 
693  if (atom.size < 16)
694  return 0;
695 
696  /* skip version and flags */
697  avio_skip(pb, 4);
698 
699  ff_mov_read_chan(c->fc, pb, st, atom.size - 4);
700 
701  return 0;
702 }
703 
704 static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
705 {
706  AVStream *st;
707 
708  if (c->fc->nb_streams < 1)
709  return 0;
710  st = c->fc->streams[c->fc->nb_streams-1];
711 
712  if (ff_get_wav_header(pb, st->codec, atom.size) < 0) {
713  av_log(c->fc, AV_LOG_WARNING, "get_wav_header failed\n");
714  }
715 
716  return 0;
717 }
718 
719 static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
720 {
721  const int num = avio_rb32(pb);
722  const int den = avio_rb32(pb);
723  AVStream *st;
724 
725  if (c->fc->nb_streams < 1)
726  return 0;
727  st = c->fc->streams[c->fc->nb_streams-1];
728 
729  if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default
730  (den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num)) {
731  av_log(c->fc, AV_LOG_WARNING,
732  "sample aspect ratio already set to %d:%d, ignoring 'pasp' atom (%d:%d)\n",
733  st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
734  num, den);
735  } else if (den != 0) {
736  st->sample_aspect_ratio.num = num;
737  st->sample_aspect_ratio.den = den;
738  }
739  return 0;
740 }
741 
742 /* this atom contains actual media data */
743 static int mov_read_mdat(MOVContext *c, AVIOContext *pb, MOVAtom atom)
744 {
745  if (atom.size == 0) /* wrong one (MP4) */
746  return 0;
747  c->found_mdat=1;
748  return 0; /* now go for moov */
749 }
750 
751 /* read major brand, minor version and compatible brands and store them as metadata */
752 static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
753 {
754  uint32_t minor_ver;
755  int comp_brand_size;
756  char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */
757  char* comp_brands_str;
758  uint8_t type[5] = {0};
759 
760  avio_read(pb, type, 4);
761  if (strcmp(type, "qt "))
762  c->isom = 1;
763  av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
764  av_dict_set(&c->fc->metadata, "major_brand", type, 0);
765  minor_ver = avio_rb32(pb); /* minor version */
766  snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);
767  av_dict_set(&c->fc->metadata, "minor_version", minor_ver_str, 0);
768 
769  comp_brand_size = atom.size - 8;
770  if (comp_brand_size < 0)
771  return AVERROR_INVALIDDATA;
772  comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
773  if (!comp_brands_str)
774  return AVERROR(ENOMEM);
775  avio_read(pb, comp_brands_str, comp_brand_size);
776  comp_brands_str[comp_brand_size] = 0;
777  av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);
778  av_freep(&comp_brands_str);
779 
780  return 0;
781 }
782 
783 /* this atom should contain all header atoms */
784 static int mov_read_moov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
785 {
786  int ret;
787 
788  if ((ret = mov_read_default(c, pb, atom)) < 0)
789  return ret;
790  /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
791  /* so we don't parse the whole file if over a network */
792  c->found_moov=1;
793  return 0; /* now go for mdat */
794 }
795 
796 static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
797 {
798  c->fragment.moof_offset = avio_tell(pb) - 8;
799  av_dlog(c->fc, "moof offset %"PRIx64"\n", c->fragment.moof_offset);
800  return mov_read_default(c, pb, atom);
801 }
802 
803 static void mov_metadata_creation_time(AVDictionary **metadata, int64_t time)
804 {
805  char buffer[32];
806  if (time) {
807  struct tm *ptm;
808  time_t timet;
809  if(time >= 2082844800)
810  time -= 2082844800; /* seconds between 1904-01-01 and Epoch */
811  timet = time;
812  ptm = gmtime(&timet);
813  if (!ptm) return;
814  strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
815  av_dict_set(metadata, "creation_time", buffer, 0);
816  }
817 }
818 
819 static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
820 {
821  AVStream *st;
822  MOVStreamContext *sc;
823  int version;
824  char language[4] = {0};
825  unsigned lang;
826  int64_t creation_time;
827 
828  if (c->fc->nb_streams < 1)
829  return 0;
830  st = c->fc->streams[c->fc->nb_streams-1];
831  sc = st->priv_data;
832 
833  version = avio_r8(pb);
834  if (version > 1) {
835  avpriv_request_sample(c->fc, "Version %d", version);
836  return AVERROR_PATCHWELCOME;
837  }
838  avio_rb24(pb); /* flags */
839  if (version == 1) {
840  creation_time = avio_rb64(pb);
841  avio_rb64(pb);
842  } else {
843  creation_time = avio_rb32(pb);
844  avio_rb32(pb); /* modification time */
845  }
846  mov_metadata_creation_time(&st->metadata, creation_time);
847 
848  sc->time_scale = avio_rb32(pb);
849  st->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
850 
851  lang = avio_rb16(pb); /* language */
852  if (ff_mov_lang_to_iso639(lang, language))
853  av_dict_set(&st->metadata, "language", language, 0);
854  avio_rb16(pb); /* quality */
855 
856  return 0;
857 }
858 
859 static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
860 {
861  int64_t creation_time;
862  int version = avio_r8(pb); /* version */
863  avio_rb24(pb); /* flags */
864 
865  if (version == 1) {
866  creation_time = avio_rb64(pb);
867  avio_rb64(pb);
868  } else {
869  creation_time = avio_rb32(pb);
870  avio_rb32(pb); /* modification time */
871  }
872  mov_metadata_creation_time(&c->fc->metadata, creation_time);
873  c->time_scale = avio_rb32(pb); /* time scale */
874 
875  av_dlog(c->fc, "time scale = %i\n", c->time_scale);
876 
877  c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
878  // set the AVCodecContext duration because the duration of individual tracks
879  // may be inaccurate
880  if (c->time_scale > 0)
881  c->fc->duration = av_rescale(c->duration, AV_TIME_BASE, c->time_scale);
882  avio_rb32(pb); /* preferred scale */
883 
884  avio_rb16(pb); /* preferred volume */
885 
886  avio_skip(pb, 10); /* reserved */
887 
888  avio_skip(pb, 36); /* display matrix */
889 
890  avio_rb32(pb); /* preview time */
891  avio_rb32(pb); /* preview duration */
892  avio_rb32(pb); /* poster time */
893  avio_rb32(pb); /* selection time */
894  avio_rb32(pb); /* selection duration */
895  avio_rb32(pb); /* current time */
896  avio_rb32(pb); /* next track ID */
897  return 0;
898 }
899 
900 static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
901 {
902  AVStream *st;
903  int little_endian;
904 
905  if (c->fc->nb_streams < 1)
906  return 0;
907  st = c->fc->streams[c->fc->nb_streams-1];
908 
909  little_endian = avio_rb16(pb) & 0xFF;
910  av_dlog(c->fc, "enda %d\n", little_endian);
911  if (little_endian == 1) {
912  switch (st->codec->codec_id) {
913  case AV_CODEC_ID_PCM_S24BE:
914  st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
915  break;
916  case AV_CODEC_ID_PCM_S32BE:
917  st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
918  break;
919  case AV_CODEC_ID_PCM_F32BE:
920  st->codec->codec_id = AV_CODEC_ID_PCM_F32LE;
921  break;
922  case AV_CODEC_ID_PCM_F64BE:
923  st->codec->codec_id = AV_CODEC_ID_PCM_F64LE;
924  break;
925  default:
926  break;
927  }
928  }
929  return 0;
930 }
931 
932 static int mov_read_fiel(MOVContext *c, AVIOContext *pb, MOVAtom atom)
933 {
934  AVStream *st;
935  unsigned mov_field_order;
936  enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;
937 
938  if (c->fc->nb_streams < 1) // will happen with jp2 files
939  return 0;
940  st = c->fc->streams[c->fc->nb_streams-1];
941  if (atom.size < 2)
942  return AVERROR_INVALIDDATA;
943  mov_field_order = avio_rb16(pb);
944  if ((mov_field_order & 0xFF00) == 0x0100)
945  decoded_field_order = AV_FIELD_PROGRESSIVE;
946  else if ((mov_field_order & 0xFF00) == 0x0200) {
947  switch (mov_field_order & 0xFF) {
948  case 0x01: decoded_field_order = AV_FIELD_TT;
949  break;
950  case 0x06: decoded_field_order = AV_FIELD_BB;
951  break;
952  case 0x09: decoded_field_order = AV_FIELD_TB;
953  break;
954  case 0x0E: decoded_field_order = AV_FIELD_BT;
955  break;
956  }
957  }
958  if (decoded_field_order == AV_FIELD_UNKNOWN && mov_field_order) {
959  av_log(NULL, AV_LOG_ERROR, "Unknown MOV field order 0x%04x\n", mov_field_order);
960  }
961  st->codec->field_order = decoded_field_order;
962 
963  return 0;
964 }
965 
966 /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
967 static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom,
968  enum AVCodecID codec_id)
969 {
970  AVStream *st;
971  uint64_t size;
972  uint8_t *buf;
973 
974  if (c->fc->nb_streams < 1) // will happen with jp2 files
975  return 0;
976  st= c->fc->streams[c->fc->nb_streams-1];
977 
978  if (st->codec->codec_id != codec_id)
979  return 0; /* unexpected codec_id - don't mess with extradata */
980 
981  size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
982  if (size > INT_MAX || (uint64_t)atom.size > INT_MAX)
983  return AVERROR_INVALIDDATA;
984  buf= av_realloc(st->codec->extradata, size);
985  if (!buf)
986  return AVERROR(ENOMEM);
987  st->codec->extradata= buf;
988  buf+= st->codec->extradata_size;
989  st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
990  AV_WB32( buf , atom.size + 8);
991  AV_WL32( buf + 4, atom.type);
992  avio_read(pb, buf + 8, atom.size);
993  return 0;
994 }
995 
996 /* wrapper functions for reading ALAC/AVS/MJPEG/MJPEG2000 extradata atoms only for those codecs */
997 static int mov_read_alac(MOVContext *c, AVIOContext *pb, MOVAtom atom)
998 {
999  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_ALAC);
1000 }
1001 
1002 static int mov_read_avss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1003 {
1004  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVS);
1005 }
1006 
1007 static int mov_read_jp2h(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1008 {
1009  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_JPEG2000);
1010 }
1011 
1012 static int mov_read_avid(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1013 {
1014  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVUI);
1015 }
1016 
1017 static int mov_read_svq3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1018 {
1019  return mov_read_extradata(c, pb, atom, AV_CODEC_ID_SVQ3);
1020 }
1021 
1022 static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1023 {
1024  AVStream *st;
1025 
1026  if (c->fc->nb_streams < 1)
1027  return 0;
1028  st = c->fc->streams[c->fc->nb_streams-1];
1029 
1030  if ((uint64_t)atom.size > (1<<30))
1031  return AVERROR_INVALIDDATA;
1032 
1033  if (st->codec->codec_id == AV_CODEC_ID_QDM2 ||
1034  st->codec->codec_id == AV_CODEC_ID_QDMC ||
1035  st->codec->codec_id == AV_CODEC_ID_SPEEX) {
1036  // pass all frma atom to codec, needed at least for QDMC and QDM2
1037  av_free(st->codec->extradata);
1038  st->codec->extradata_size = 0;
1039  st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
1040  if (!st->codec->extradata)
1041  return AVERROR(ENOMEM);
1042  st->codec->extradata_size = atom.size;
1043  avio_read(pb, st->codec->extradata, atom.size);
1044  } else if (atom.size > 8) { /* to read frma, esds atoms */
1045  int ret;
1046  if ((ret = mov_read_default(c, pb, atom)) < 0)
1047  return ret;
1048  } else
1049  avio_skip(pb, atom.size);
1050  return 0;
1051 }
1052 
1053 /**
1054  * This function reads atom content and puts data in extradata without tag
1055  * nor size unlike mov_read_extradata.
1056  */
1057 static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1058 {
1059  AVStream *st;
1060 
1061  if (c->fc->nb_streams < 1)
1062  return 0;
1063  st = c->fc->streams[c->fc->nb_streams-1];
1064 
1065  if ((uint64_t)atom.size > (1<<30))
1066  return AVERROR_INVALIDDATA;
1067 
1068  if (atom.size >= 10) {
1069  // Broken files created by legacy versions of libavformat will
1070  // wrap a whole fiel atom inside of a glbl atom.
1071  unsigned size = avio_rb32(pb);
1072  unsigned type = avio_rl32(pb);
1073  avio_seek(pb, -8, SEEK_CUR);
1074  if (type == MKTAG('f','i','e','l') && size == atom.size)
1075  return mov_read_default(c, pb, atom);
1076  }
1077  av_free(st->codec->extradata);
1078  st->codec->extradata_size = 0;
1079  st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
1080  if (!st->codec->extradata)
1081  return AVERROR(ENOMEM);
1082  st->codec->extradata_size = atom.size;
1083  avio_read(pb, st->codec->extradata, atom.size);
1084  return 0;
1085 }
1086 
1087 static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1088 {
1089  AVStream *st;
1090  uint8_t profile_level;
1091 
1092  if (c->fc->nb_streams < 1)
1093  return 0;
1094  st = c->fc->streams[c->fc->nb_streams-1];
1095 
1096  if (atom.size >= (1<<28) || atom.size < 7)
1097  return AVERROR_INVALIDDATA;
1098 
1099  profile_level = avio_r8(pb);
1100  if ((profile_level & 0xf0) != 0xc0)
1101  return 0;
1102 
1103  av_free(st->codec->extradata);
1104  st->codec->extradata_size = 0;
1105  st->codec->extradata = av_mallocz(atom.size - 7 + FF_INPUT_BUFFER_PADDING_SIZE);
1106  if (!st->codec->extradata)
1107  return AVERROR(ENOMEM);
1108  st->codec->extradata_size = atom.size - 7;
1109  avio_seek(pb, 6, SEEK_CUR);
1110  avio_read(pb, st->codec->extradata, st->codec->extradata_size);
1111  return 0;
1112 }
1113 
1114 /**
1115  * An strf atom is a BITMAPINFOHEADER struct. This struct is 40 bytes itself,
1116  * but can have extradata appended at the end after the 40 bytes belonging
1117  * to the struct.
1118  */
1119 static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1120 {
1121  AVStream *st;
1122 
1123  if (c->fc->nb_streams < 1)
1124  return 0;
1125  if (atom.size <= 40)
1126  return 0;
1127  st = c->fc->streams[c->fc->nb_streams-1];
1128 
1129  if ((uint64_t)atom.size > (1<<30))
1130  return AVERROR_INVALIDDATA;
1131 
1132  av_free(st->codec->extradata);
1133  st->codec->extradata_size = 0;
1134  st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);
1135  if (!st->codec->extradata)
1136  return AVERROR(ENOMEM);
1137  st->codec->extradata_size = atom.size - 40;
1138  avio_skip(pb, 40);
1139  avio_read(pb, st->codec->extradata, atom.size - 40);
1140  return 0;
1141 }
1142 
1143 static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1144 {
1145  AVStream *st;
1146  MOVStreamContext *sc;
1147  unsigned int i, entries;
1148 
1149  if (c->fc->nb_streams < 1)
1150  return 0;
1151  st = c->fc->streams[c->fc->nb_streams-1];
1152  sc = st->priv_data;
1153 
1154  avio_r8(pb); /* version */
1155  avio_rb24(pb); /* flags */
1156 
1157  entries = avio_rb32(pb);
1158 
1159  if (!entries)
1160  return 0;
1161  if (entries >= UINT_MAX/sizeof(int64_t))
1162  return AVERROR_INVALIDDATA;
1163 
1164  sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
1165  if (!sc->chunk_offsets)
1166  return AVERROR(ENOMEM);
1167  sc->chunk_count = entries;
1168 
1169  if (atom.type == MKTAG('s','t','c','o'))
1170  for (i = 0; i < entries && !pb->eof_reached; i++)
1171  sc->chunk_offsets[i] = avio_rb32(pb);
1172  else if (atom.type == MKTAG('c','o','6','4'))
1173  for (i = 0; i < entries && !pb->eof_reached; i++)
1174  sc->chunk_offsets[i] = avio_rb64(pb);
1175  else
1176  return AVERROR_INVALIDDATA;
1177 
1178  sc->chunk_count = i;
1179 
1180  if (pb->eof_reached)
1181  return AVERROR_EOF;
1182 
1183  return 0;
1184 }
1185 
1186 /**
1187  * Compute codec id for 'lpcm' tag.
1188  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.
1189  */
1190 enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
1191 {
1192  /* lpcm flags:
1193  * 0x1 = float
1194  * 0x2 = big-endian
1195  * 0x4 = signed
1196  */
1197  return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);
1198 }
1199 
1200 int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
1201 {
1202  AVStream *st;
1203  MOVStreamContext *sc;
1204  int j, pseudo_stream_id;
1205 
1206  if (c->fc->nb_streams < 1)
1207  return 0;
1208  st = c->fc->streams[c->fc->nb_streams-1];
1209  sc = st->priv_data;
1210 
1211  for (pseudo_stream_id = 0;
1212  pseudo_stream_id < entries && !pb->eof_reached;
1213  pseudo_stream_id++) {
1214  //Parsing Sample description table
1215  enum AVCodecID id;
1216  int dref_id = 1;
1217  MOVAtom a = { AV_RL32("stsd") };
1218  int64_t start_pos = avio_tell(pb);
1219  int64_t size = avio_rb32(pb); /* size */
1220  uint32_t format = avio_rl32(pb); /* data format */
1221 
1222  if (size >= 16) {
1223  avio_rb32(pb); /* reserved */
1224  avio_rb16(pb); /* reserved */
1225  dref_id = avio_rb16(pb);
1226  }else if (size <= 7){
1227  av_log(c->fc, AV_LOG_ERROR, "invalid size %"PRId64" in stsd\n", size);
1228  return AVERROR_INVALIDDATA;
1229  }
1230 
1231  if (st->codec->codec_tag &&
1232  st->codec->codec_tag != format &&
1233  (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags, format) != c->fc->video_codec_id
1234  : st->codec->codec_tag != MKTAG('j','p','e','g'))
1235  ){
1236  /* Multiple fourcc, we skip JPEG. This is not correct, we should
1237  * export it as a separate AVStream but this needs a few changes
1238  * in the MOV demuxer, patch welcome. */
1239  av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
1240  avio_skip(pb, size - (avio_tell(pb) - start_pos));
1241  continue;
1242  }
1243  /* we cannot demux concatenated h264 streams because of different extradata */
1244  if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))
1245  av_log(c->fc, AV_LOG_WARNING, "Concatenated H.264 might not play corrently.\n");
1246  sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
1247  sc->dref_id= dref_id;
1248 
1249  st->codec->codec_tag = format;
1250  id = ff_codec_get_id(ff_codec_movaudio_tags, format);
1251  if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))
1252  id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);
1253 
1254  if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {
1255  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1256  } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */
1257  format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
1258  id = ff_codec_get_id(ff_codec_movvideo_tags, format);
1259  if (id <= 0)
1260  id = ff_codec_get_id(ff_codec_bmp_tags, format);
1261  if (id > 0)
1262  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1263  else if (st->codec->codec_type == AVMEDIA_TYPE_DATA ||
1264  (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1265  st->codec->codec_id == AV_CODEC_ID_NONE)){
1266  id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
1267  if (id > 0)
1268  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1269  }
1270  }
1271 
1272  av_dlog(c->fc, "size=%"PRId64" 4CC= %c%c%c%c codec_type=%d\n", size,
1273  (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
1274  (format >> 24) & 0xff, st->codec->codec_type);
1275 
1276  if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
1277  unsigned int color_depth, len;
1278  int color_greyscale;
1279  int color_table_id;
1280 
1281  st->codec->codec_id = id;
1282  avio_rb16(pb); /* version */
1283  avio_rb16(pb); /* revision level */
1284  avio_rb32(pb); /* vendor */
1285  avio_rb32(pb); /* temporal quality */
1286  avio_rb32(pb); /* spatial quality */
1287 
1288  st->codec->width = avio_rb16(pb); /* width */
1289  st->codec->height = avio_rb16(pb); /* height */
1290 
1291  avio_rb32(pb); /* horiz resolution */
1292  avio_rb32(pb); /* vert resolution */
1293  avio_rb32(pb); /* data size, always 0 */
1294  avio_rb16(pb); /* frames per samples */
1295 
1296  len = avio_r8(pb); /* codec name, pascal string */
1297  if (len > 31)
1298  len = 31;
1299  mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);
1300  if (len < 31)
1301  avio_skip(pb, 31 - len);
1302  /* codec_tag YV12 triggers an UV swap in rawdec.c */
1303  if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25)){
1304  st->codec->codec_tag=MKTAG('I', '4', '2', '0');
1305  st->codec->width &= ~1;
1306  st->codec->height &= ~1;
1307  }
1308  /* Flash Media Server uses tag H263 with Sorenson Spark */
1309  if (format == MKTAG('H','2','6','3') &&
1310  !memcmp(st->codec->codec_name, "Sorenson H263", 13))
1311  st->codec->codec_id = AV_CODEC_ID_FLV1;
1312 
1313  st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */
1314  color_table_id = avio_rb16(pb); /* colortable id */
1315  av_dlog(c->fc, "depth %d, ctab id %d\n",
1316  st->codec->bits_per_coded_sample, color_table_id);
1317  /* figure out the palette situation */
1318  color_depth = st->codec->bits_per_coded_sample & 0x1F;
1319  color_greyscale = st->codec->bits_per_coded_sample & 0x20;
1320 
1321  /* if the depth is 2, 4, or 8 bpp, file is palettized */
1322  if ((color_depth == 2) || (color_depth == 4) ||
1323  (color_depth == 8)) {
1324  /* for palette traversal */
1325  unsigned int color_start, color_count, color_end;
1326  unsigned char a, r, g, b;
1327 
1328  if (color_greyscale) {
1329  int color_index, color_dec;
1330  /* compute the greyscale palette */
1331  st->codec->bits_per_coded_sample = color_depth;
1332  color_count = 1 << color_depth;
1333  color_index = 255;
1334  color_dec = 256 / (color_count - 1);
1335  for (j = 0; j < color_count; j++) {
1336  if (id == AV_CODEC_ID_CINEPAK){
1337  r = g = b = color_count - 1 - color_index;
1338  }else
1339  r = g = b = color_index;
1340  sc->palette[j] =
1341  (0xFFU << 24) | (r << 16) | (g << 8) | (b);
1342  color_index -= color_dec;
1343  if (color_index < 0)
1344  color_index = 0;
1345  }
1346  } else if (color_table_id) {
1347  const uint8_t *color_table;
1348  /* if flag bit 3 is set, use the default palette */
1349  color_count = 1 << color_depth;
1350  if (color_depth == 2)
1351  color_table = ff_qt_default_palette_4;
1352  else if (color_depth == 4)
1353  color_table = ff_qt_default_palette_16;
1354  else
1355  color_table = ff_qt_default_palette_256;
1356 
1357  for (j = 0; j < color_count; j++) {
1358  r = color_table[j * 3 + 0];
1359  g = color_table[j * 3 + 1];
1360  b = color_table[j * 3 + 2];
1361  sc->palette[j] =
1362  (0xFFU << 24) | (r << 16) | (g << 8) | (b);
1363  }
1364  } else {
1365  /* load the palette from the file */
1366  color_start = avio_rb32(pb);
1367  color_count = avio_rb16(pb);
1368  color_end = avio_rb16(pb);
1369  if ((color_start <= 255) &&
1370  (color_end <= 255)) {
1371  for (j = color_start; j <= color_end; j++) {
1372  /* each A, R, G, or B component is 16 bits;
1373  * only use the top 8 bits */
1374  a = avio_r8(pb);
1375  avio_r8(pb);
1376  r = avio_r8(pb);
1377  avio_r8(pb);
1378  g = avio_r8(pb);
1379  avio_r8(pb);
1380  b = avio_r8(pb);
1381  avio_r8(pb);
1382  sc->palette[j] =
1383  (a << 24 ) | (r << 16) | (g << 8) | (b);
1384  }
1385  }
1386  }
1387  sc->has_palette = 1;
1388  }
1389  } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
1390  int bits_per_sample, flags;
1391  uint16_t version = avio_rb16(pb);
1392  AVDictionaryEntry *compatible_brands = av_dict_get(c->fc->metadata, "compatible_brands", NULL, AV_DICT_MATCH_CASE);
1393 
1394  st->codec->codec_id = id;
1395  avio_rb16(pb); /* revision level */
1396  avio_rb32(pb); /* vendor */
1397 
1398  st->codec->channels = avio_rb16(pb); /* channel count */
1399  av_dlog(c->fc, "audio channels %d\n", st->codec->channels);
1400  st->codec->bits_per_coded_sample = avio_rb16(pb); /* sample size */
1401 
1402  sc->audio_cid = avio_rb16(pb);
1403  avio_rb16(pb); /* packet size = 0 */
1404 
1405  st->codec->sample_rate = ((avio_rb32(pb) >> 16));
1406 
1407  //Read QT version 1 fields. In version 0 these do not exist.
1408  av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);
1409  if (!c->isom ||
1410  (compatible_brands && strstr(compatible_brands->value, "qt "))) {
1411  if (version==1) {
1412  sc->samples_per_frame = avio_rb32(pb);
1413  avio_rb32(pb); /* bytes per packet */
1414  sc->bytes_per_frame = avio_rb32(pb);
1415  avio_rb32(pb); /* bytes per sample */
1416  } else if (version==2) {
1417  avio_rb32(pb); /* sizeof struct only */
1418  st->codec->sample_rate = av_int2double(avio_rb64(pb)); /* float 64 */
1419  st->codec->channels = avio_rb32(pb);
1420  avio_rb32(pb); /* always 0x7F000000 */
1421  st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */
1422  flags = avio_rb32(pb); /* lpcm format specific flag */
1423  sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */
1424  sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */
1425  if (format == MKTAG('l','p','c','m'))
1426  st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);
1427  }
1428  }
1429 
1430  switch (st->codec->codec_id) {
1431  case AV_CODEC_ID_PCM_S8:
1432  case AV_CODEC_ID_PCM_U8:
1433  if (st->codec->bits_per_coded_sample == 16)
1434  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
1435  break;
1436  case AV_CODEC_ID_PCM_S16LE:
1437  case AV_CODEC_ID_PCM_S16BE:
1438  if (st->codec->bits_per_coded_sample == 8)
1439  st->codec->codec_id = AV_CODEC_ID_PCM_S8;
1440  else if (st->codec->bits_per_coded_sample == 24)
1441  st->codec->codec_id =
1442  st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?
1443  AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
1444  break;
1445  /* set values for old format before stsd version 1 appeared */
1446  case AV_CODEC_ID_MACE3:
1447  sc->samples_per_frame = 6;
1448  sc->bytes_per_frame = 2*st->codec->channels;
1449  break;
1450  case AV_CODEC_ID_MACE6:
1451  sc->samples_per_frame = 6;
1452  sc->bytes_per_frame = 1*st->codec->channels;
1453  break;
1454  case AV_CODEC_ID_ADPCM_IMA_QT:
1455  sc->samples_per_frame = 64;
1456  sc->bytes_per_frame = 34*st->codec->channels;
1457  break;
1458  case AV_CODEC_ID_GSM:
1459  sc->samples_per_frame = 160;
1460  sc->bytes_per_frame = 33;
1461  break;
1462  default:
1463  break;
1464  }
1465 
1466  bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
1467  if (bits_per_sample) {
1468  st->codec->bits_per_coded_sample = bits_per_sample;
1469  sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
1470  }
1471  } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){
1472  // ttxt stsd contains display flags, justification, background
1473  // color, fonts, and default styles, so fake an atom to read it
1474  MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };
1475  if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom
1476  mov_read_glbl(c, pb, fake_atom);
1477  st->codec->codec_id= id;
1478  st->codec->width = sc->width;
1479  st->codec->height = sc->height;
1480  } else {
1481  if (st->codec->codec_tag == MKTAG('t','m','c','d')) {
1482  MOVStreamContext *tmcd_ctx = st->priv_data;
1483  int val;
1484  avio_rb32(pb); /* reserved */
1485  val = avio_rb32(pb); /* flags */
1486  tmcd_ctx->tmcd_flags = val;
1487  if (val & 1)
1488  st->codec->flags2 |= CODEC_FLAG2_DROP_FRAME_TIMECODE;
1489  avio_rb32(pb); /* time scale */
1490  avio_rb32(pb); /* frame duration */
1491  st->codec->time_base.den = avio_r8(pb); /* number of frame */
1492  st->codec->time_base.num = 1;
1493  }
1494  /* other codec type, just skip (rtp, mp4s, ...) */
1495  avio_skip(pb, size - (avio_tell(pb) - start_pos));
1496  }
1497  /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
1498  a.size = size - (avio_tell(pb) - start_pos);
1499  if (a.size > 8) {
1500  int ret;
1501  if ((ret = mov_read_default(c, pb, a)) < 0)
1502  return ret;
1503  } else if (a.size > 0)
1504  avio_skip(pb, a.size);
1505  }
1506 
1507  if (pb->eof_reached)
1508  return AVERROR_EOF;
1509 
1510  if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)
1511  st->codec->sample_rate= sc->time_scale;
1512 
1513  /* special codec parameters handling */
1514  switch (st->codec->codec_id) {
1515 #if CONFIG_DV_DEMUXER
1516  case AV_CODEC_ID_DVAUDIO:
1517  c->dv_fctx = avformat_alloc_context();
1518  c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);
1519  if (!c->dv_demux) {
1520  av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
1521  return AVERROR(ENOMEM);
1522  }
1523  sc->dv_audio_container = 1;
1524  st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
1525  break;
1526 #endif
1527  /* no ifdef since parameters are always those */
1528  case AV_CODEC_ID_QCELP:
1529  // force sample rate for qcelp when not stored in mov
1530  if (st->codec->codec_tag != MKTAG('Q','c','l','p'))
1531  st->codec->sample_rate = 8000;
1532  st->codec->channels= 1; /* really needed */
1533  break;
1534  case AV_CODEC_ID_AMR_NB:
1535  st->codec->channels= 1; /* really needed */
1536  /* force sample rate for amr, stsd in 3gp does not store sample rate */
1537  st->codec->sample_rate = 8000;
1538  break;
1539  case AV_CODEC_ID_AMR_WB:
1540  st->codec->channels = 1;
1541  st->codec->sample_rate = 16000;
1542  break;
1543  case AV_CODEC_ID_MP2:
1544  case AV_CODEC_ID_MP3:
1545  st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
1546  st->need_parsing = AVSTREAM_PARSE_FULL;
1547  break;
1548  case AV_CODEC_ID_GSM:
1549  case AV_CODEC_ID_ADPCM_MS:
1550  case AV_CODEC_ID_ADPCM_IMA_WAV:
1551  case AV_CODEC_ID_ILBC:
1552  case AV_CODEC_ID_MACE3:
1553  case AV_CODEC_ID_MACE6:
1554  st->codec->block_align = sc->bytes_per_frame;
1555  break;
1556  case AV_CODEC_ID_ALAC:
1557  if (st->codec->extradata_size == 36) {
1558  st->codec->channels = AV_RB8 (st->codec->extradata+21);
1559  st->codec->sample_rate = AV_RB32(st->codec->extradata+32);
1560  }
1561  break;
1562  case AV_CODEC_ID_AC3:
1563  st->need_parsing = AVSTREAM_PARSE_FULL;
1564  break;
1565  case AV_CODEC_ID_MPEG1VIDEO:
1566  st->need_parsing = AVSTREAM_PARSE_FULL;
1567  break;
1568  case AV_CODEC_ID_VC1:
1569  st->need_parsing = AVSTREAM_PARSE_FULL;
1570  break;
1571  default:
1572  break;
1573  }
1574 
1575  return 0;
1576 }
1577 
1578 static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1579 {
1580  int entries;
1581 
1582  avio_r8(pb); /* version */
1583  avio_rb24(pb); /* flags */
1584  entries = avio_rb32(pb);
1585 
1586  return ff_mov_read_stsd_entries(c, pb, entries);
1587 }
1588 
1589 static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1590 {
1591  AVStream *st;
1592  MOVStreamContext *sc;
1593  unsigned int i, entries;
1594 
1595  if (c->fc->nb_streams < 1)
1596  return 0;
1597  st = c->fc->streams[c->fc->nb_streams-1];
1598  sc = st->priv_data;
1599 
1600  avio_r8(pb); /* version */
1601  avio_rb24(pb); /* flags */
1602 
1603  entries = avio_rb32(pb);
1604 
1605  av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
1606 
1607  if (!entries)
1608  return 0;
1609  if (entries >= UINT_MAX / sizeof(*sc->stsc_data))
1610  return AVERROR_INVALIDDATA;
1611  sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
1612  if (!sc->stsc_data)
1613  return AVERROR(ENOMEM);
1614 
1615  for (i = 0; i < entries && !pb->eof_reached; i++) {
1616  sc->stsc_data[i].first = avio_rb32(pb);
1617  sc->stsc_data[i].count = avio_rb32(pb);
1618  sc->stsc_data[i].id = avio_rb32(pb);
1619  }
1620 
1621  sc->stsc_count = i;
1622 
1623  if (pb->eof_reached)
1624  return AVERROR_EOF;
1625 
1626  return 0;
1627 }
1628 
1629 static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1630 {
1631  AVStream *st;
1632  MOVStreamContext *sc;
1633  unsigned i, entries;
1634 
1635  if (c->fc->nb_streams < 1)
1636  return 0;
1637  st = c->fc->streams[c->fc->nb_streams-1];
1638  sc = st->priv_data;
1639 
1640  avio_rb32(pb); // version + flags
1641 
1642  entries = avio_rb32(pb);
1643  if (entries >= UINT_MAX / sizeof(*sc->stps_data))
1644  return AVERROR_INVALIDDATA;
1645  sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));
1646  if (!sc->stps_data)
1647  return AVERROR(ENOMEM);
1648 
1649  for (i = 0; i < entries && !pb->eof_reached; i++) {
1650  sc->stps_data[i] = avio_rb32(pb);
1651  //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);
1652  }
1653 
1654  sc->stps_count = i;
1655 
1656  if (pb->eof_reached)
1657  return AVERROR_EOF;
1658 
1659  return 0;
1660 }
1661 
1662 static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1663 {
1664  AVStream *st;
1665  MOVStreamContext *sc;
1666  unsigned int i, entries;
1667 
1668  if (c->fc->nb_streams < 1)
1669  return 0;
1670  st = c->fc->streams[c->fc->nb_streams-1];
1671  sc = st->priv_data;
1672 
1673  avio_r8(pb); /* version */
1674  avio_rb24(pb); /* flags */
1675 
1676  entries = avio_rb32(pb);
1677 
1678  av_dlog(c->fc, "keyframe_count = %d\n", entries);
1679 
1680  if (!entries)
1681  {
1682  sc->keyframe_absent = 1;
1683  return 0;
1684  }
1685  if (entries >= UINT_MAX / sizeof(int))
1686  return AVERROR_INVALIDDATA;
1687  sc->keyframes = av_malloc(entries * sizeof(int));
1688  if (!sc->keyframes)
1689  return AVERROR(ENOMEM);
1690 
1691  for (i = 0; i < entries && !pb->eof_reached; i++) {
1692  sc->keyframes[i] = avio_rb32(pb);
1693  //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
1694  }
1695 
1696  sc->keyframe_count = i;
1697 
1698  if (pb->eof_reached)
1699  return AVERROR_EOF;
1700 
1701  return 0;
1702 }
1703 
1704 static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1705 {
1706  AVStream *st;
1707  MOVStreamContext *sc;
1708  unsigned int i, entries, sample_size, field_size, num_bytes;
1709  GetBitContext gb;
1710  unsigned char* buf;
1711 
1712  if (c->fc->nb_streams < 1)
1713  return 0;
1714  st = c->fc->streams[c->fc->nb_streams-1];
1715  sc = st->priv_data;
1716 
1717  avio_r8(pb); /* version */
1718  avio_rb24(pb); /* flags */
1719 
1720  if (atom.type == MKTAG('s','t','s','z')) {
1721  sample_size = avio_rb32(pb);
1722  if (!sc->sample_size) /* do not overwrite value computed in stsd */
1723  sc->sample_size = sample_size;
1724  sc->alt_sample_size = sample_size;
1725  field_size = 32;
1726  } else {
1727  sample_size = 0;
1728  avio_rb24(pb); /* reserved */
1729  field_size = avio_r8(pb);
1730  }
1731  entries = avio_rb32(pb);
1732 
1733  av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);
1734 
1735  sc->sample_count = entries;
1736  if (sample_size)
1737  return 0;
1738 
1739  if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
1740  av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);
1741  return AVERROR_INVALIDDATA;
1742  }
1743 
1744  if (!entries)
1745  return 0;
1746  if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
1747  return AVERROR_INVALIDDATA;
1748  sc->sample_sizes = av_malloc(entries * sizeof(int));
1749  if (!sc->sample_sizes)
1750  return AVERROR(ENOMEM);
1751 
1752  num_bytes = (entries*field_size+4)>>3;
1753 
1754  buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
1755  if (!buf) {
1756  av_freep(&sc->sample_sizes);
1757  return AVERROR(ENOMEM);
1758  }
1759 
1760  if (avio_read(pb, buf, num_bytes) < num_bytes) {
1761  av_freep(&sc->sample_sizes);
1762  av_free(buf);
1763  return AVERROR_INVALIDDATA;
1764  }
1765 
1766  init_get_bits(&gb, buf, 8*num_bytes);
1767 
1768  for (i = 0; i < entries && !pb->eof_reached; i++) {
1769  sc->sample_sizes[i] = get_bits_long(&gb, field_size);
1770  sc->data_size += sc->sample_sizes[i];
1771  }
1772 
1773  sc->sample_count = i;
1774 
1775  if (pb->eof_reached)
1776  return AVERROR_EOF;
1777 
1778  av_free(buf);
1779  return 0;
1780 }
1781 
1782 static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1783 {
1784  AVStream *st;
1785  MOVStreamContext *sc;
1786  unsigned int i, entries;
1787  int64_t duration=0;
1788  int64_t total_sample_count=0;
1789 
1790  if (c->fc->nb_streams < 1)
1791  return 0;
1792  st = c->fc->streams[c->fc->nb_streams-1];
1793  sc = st->priv_data;
1794 
1795  avio_r8(pb); /* version */
1796  avio_rb24(pb); /* flags */
1797  entries = avio_rb32(pb);
1798 
1799  av_dlog(c->fc, "track[%i].stts.entries = %i\n",
1800  c->fc->nb_streams-1, entries);
1801 
1802  if (entries >= UINT_MAX / sizeof(*sc->stts_data))
1803  return -1;
1804 
1805  sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
1806  if (!sc->stts_data)
1807  return AVERROR(ENOMEM);
1808 
1809  for (i = 0; i < entries && !pb->eof_reached; i++) {
1810  int sample_duration;
1811  int sample_count;
1812 
1813  sample_count=avio_rb32(pb);
1814  sample_duration = avio_rb32(pb);
1815  /* sample_duration < 0 is invalid based on the spec */
1816  if (sample_duration < 0) {
1817  av_log(c->fc, AV_LOG_ERROR, "Invalid SampleDelta in STTS %d\n", sample_duration);
1818  sample_duration = 1;
1819  }
1820  sc->stts_data[i].count= sample_count;
1821  sc->stts_data[i].duration= sample_duration;
1822 
1823  av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",
1824  sample_count, sample_duration);
1825 
1826  duration+=(int64_t)sample_duration*sample_count;
1827  total_sample_count+=sample_count;
1828  }
1829 
1830  sc->stts_count = i;
1831 
1832  if (pb->eof_reached)
1833  return AVERROR_EOF;
1834 
1835  st->nb_frames= total_sample_count;
1836  if (duration)
1837  st->duration= duration;
1838  sc->track_end = duration;
1839  return 0;
1840 }
1841 
1842 static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1843 {
1844  AVStream *st;
1845  MOVStreamContext *sc;
1846  unsigned int i, entries;
1847 
1848  if (c->fc->nb_streams < 1)
1849  return 0;
1850  st = c->fc->streams[c->fc->nb_streams-1];
1851  sc = st->priv_data;
1852 
1853  avio_r8(pb); /* version */
1854  avio_rb24(pb); /* flags */
1855  entries = avio_rb32(pb);
1856 
1857  av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
1858 
1859  if (!entries)
1860  return 0;
1861  if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
1862  return AVERROR_INVALIDDATA;
1863  sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
1864  if (!sc->ctts_data)
1865  return AVERROR(ENOMEM);
1866 
1867  for (i = 0; i < entries && !pb->eof_reached; i++) {
1868  int count =avio_rb32(pb);
1869  int duration =avio_rb32(pb);
1870 
1871  sc->ctts_data[i].count = count;
1872  sc->ctts_data[i].duration= duration;
1873 
1874  av_dlog(c->fc, "count=%d, duration=%d\n",
1875  count, duration);
1876 
1877  if (FFABS(duration) > (1<<28) && i+2<entries) {
1878  av_log(c->fc, AV_LOG_WARNING, "CTTS invalid\n");
1879  av_freep(&sc->ctts_data);
1880  sc->ctts_count = 0;
1881  return 0;
1882  }
1883 
1884  if (duration < 0 && i+2<entries)
1885  sc->dts_shift = FFMAX(sc->dts_shift, -duration);
1886  }
1887 
1888  sc->ctts_count = i;
1889 
1890  if (pb->eof_reached)
1891  return AVERROR_EOF;
1892 
1893  av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);
1894 
1895  return 0;
1896 }
1897 
1898 static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1899 {
1900  AVStream *st;
1901  MOVStreamContext *sc;
1902  unsigned int i, entries;
1903  uint8_t version;
1904  uint32_t grouping_type;
1905 
1906  if (c->fc->nb_streams < 1)
1907  return 0;
1908  st = c->fc->streams[c->fc->nb_streams-1];
1909  sc = st->priv_data;
1910 
1911  version = avio_r8(pb); /* version */
1912  avio_rb24(pb); /* flags */
1913  grouping_type = avio_rl32(pb);
1914  if (grouping_type != MKTAG( 'r','a','p',' '))
1915  return 0; /* only support 'rap ' grouping */
1916  if (version == 1)
1917  avio_rb32(pb); /* grouping_type_parameter */
1918 
1919  entries = avio_rb32(pb);
1920  if (!entries)
1921  return 0;
1922  if (entries >= UINT_MAX / sizeof(*sc->rap_group))
1923  return AVERROR_INVALIDDATA;
1924  sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));
1925  if (!sc->rap_group)
1926  return AVERROR(ENOMEM);
1927 
1928  for (i = 0; i < entries && !pb->eof_reached; i++) {
1929  sc->rap_group[i].count = avio_rb32(pb); /* sample_count */
1930  sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */
1931  }
1932 
1933  sc->rap_group_count = i;
1934 
1935  return pb->eof_reached ? AVERROR_EOF : 0;
1936 }
1937 
1938 static void mov_build_index(MOVContext *mov, AVStream *st)
1939 {
1940  MOVStreamContext *sc = st->priv_data;
1941  int64_t current_offset;
1942  int64_t current_dts = 0;
1943  unsigned int stts_index = 0;
1944  unsigned int stsc_index = 0;
1945  unsigned int stss_index = 0;
1946  unsigned int stps_index = 0;
1947  unsigned int i, j;
1948  uint64_t stream_size = 0;
1949  AVIndexEntry *mem;
1950 
1951  /* adjust first dts according to edit list */
1952  if ((sc->empty_duration || sc->start_time) && mov->time_scale > 0) {
1953  if (sc->empty_duration)
1954  sc->empty_duration = av_rescale(sc->empty_duration, sc->time_scale, mov->time_scale);
1955  sc->time_offset = sc->start_time - sc->empty_duration;
1956  current_dts = -sc->time_offset;
1957  if (sc->ctts_count>0 && sc->stts_count>0 &&
1958  sc->ctts_data[0].duration / FFMAX(sc->stts_data[0].duration, 1) > 16) {
1959  /* more than 16 frames delay, dts are likely wrong
1960  this happens with files created by iMovie */
1961  sc->wrong_dts = 1;
1962  st->codec->has_b_frames = 1;
1963  }
1964  }
1965 
1966  /* only use old uncompressed audio chunk demuxing when stts specifies it */
1967  if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
1968  sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
1969  unsigned int current_sample = 0;
1970  unsigned int stts_sample = 0;
1971  unsigned int sample_size;
1972  unsigned int distance = 0;
1973  unsigned int rap_group_index = 0;
1974  unsigned int rap_group_sample = 0;
1975  int rap_group_present = sc->rap_group_count && sc->rap_group;
1976  int key_off = (sc->keyframe_count && sc->keyframes[0] > 0) || (sc->stps_count && sc->stps_data[0] > 0);
1977 
1978  current_dts -= sc->dts_shift;
1979 
1980  if (!sc->sample_count || st->nb_index_entries)
1981  return;
1982  if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
1983  return;
1984  mem = av_realloc(st->index_entries, (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries));
1985  if (!mem)
1986  return;
1987  st->index_entries = mem;
1988  st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);
1989 
1990  for (i = 0; i < sc->chunk_count; i++) {
1991  current_offset = sc->chunk_offsets[i];
1992  while (stsc_index + 1 < sc->stsc_count &&
1993  i + 1 == sc->stsc_data[stsc_index + 1].first)
1994  stsc_index++;
1995  for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
1996  int keyframe = 0;
1997  if (current_sample >= sc->sample_count) {
1998  av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
1999  return;
2000  }
2001 
2002  if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {
2003  keyframe = 1;
2004  if (stss_index + 1 < sc->keyframe_count)
2005  stss_index++;
2006  } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
2007  keyframe = 1;
2008  if (stps_index + 1 < sc->stps_count)
2009  stps_index++;
2010  }
2011  if (rap_group_present && rap_group_index < sc->rap_group_count) {
2012  if (sc->rap_group[rap_group_index].index > 0)
2013  keyframe = 1;
2014  if (++rap_group_sample == sc->rap_group[rap_group_index].count) {
2015  rap_group_sample = 0;
2016  rap_group_index++;
2017  }
2018  }
2019  if (keyframe)
2020  distance = 0;
2021  sample_size = sc->alt_sample_size > 0 ? sc->alt_sample_size : sc->sample_sizes[current_sample];
2022  if (sc->pseudo_stream_id == -1 ||
2023  sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
2024  AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];
2025  e->pos = current_offset;
2026  e->timestamp = current_dts;
2027  e->size = sample_size;
2028  e->min_distance = distance;
2029  e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
2030  av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
2031  "size %d, distance %d, keyframe %d\n", st->index, current_sample,
2032  current_offset, current_dts, sample_size, distance, keyframe);
2033  }
2034 
2035  current_offset += sample_size;
2036  stream_size += sample_size;
2037  current_dts += sc->stts_data[stts_index].duration;
2038  distance++;
2039  stts_sample++;
2040  current_sample++;
2041  if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
2042  stts_sample = 0;
2043  stts_index++;
2044  }
2045  }
2046  }
2047  if (st->duration > 0)
2048  st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;
2049  } else {
2050  unsigned chunk_samples, total = 0;
2051 
2052  // compute total chunk count
2053  for (i = 0; i < sc->stsc_count; i++) {
2054  unsigned count, chunk_count;
2055 
2056  chunk_samples = sc->stsc_data[i].count;
2057  if (i != sc->stsc_count - 1 &&
2058  sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
2059  av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
2060  return;
2061  }
2062 
2063  if (sc->samples_per_frame >= 160) { // gsm
2064  count = chunk_samples / sc->samples_per_frame;
2065  } else if (sc->samples_per_frame > 1) {
2066  unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
2067  count = (chunk_samples+samples-1) / samples;
2068  } else {
2069  count = (chunk_samples+1023) / 1024;
2070  }
2071 
2072  if (i < sc->stsc_count - 1)
2073  chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
2074  else
2075  chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
2076  total += chunk_count * count;
2077  }
2078 
2079  av_dlog(mov->fc, "chunk count %d\n", total);
2080  if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
2081  return;
2082  mem = av_realloc(st->index_entries, (st->nb_index_entries + total) * sizeof(*st->index_entries));
2083  if (!mem)
2084  return;
2085  st->index_entries = mem;
2086  st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);
2087 
2088  // populate index
2089  for (i = 0; i < sc->chunk_count; i++) {
2090  current_offset = sc->chunk_offsets[i];
2091  if (stsc_index + 1 < sc->stsc_count &&
2092  i + 1 == sc->stsc_data[stsc_index + 1].first)
2093  stsc_index++;
2094  chunk_samples = sc->stsc_data[stsc_index].count;
2095 
2096  while (chunk_samples > 0) {
2097  AVIndexEntry *e;
2098  unsigned size, samples;
2099 
2100  if (sc->samples_per_frame >= 160) { // gsm
2101  samples = sc->samples_per_frame;
2102  size = sc->bytes_per_frame;
2103  } else {
2104  if (sc->samples_per_frame > 1) {
2105  samples = FFMIN((1024 / sc->samples_per_frame)*
2106  sc->samples_per_frame, chunk_samples);
2107  size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
2108  } else {
2109  samples = FFMIN(1024, chunk_samples);
2110  size = samples * sc->sample_size;
2111  }
2112  }
2113 
2114  if (st->nb_index_entries >= total) {
2115  av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);
2116  return;
2117  }
2118  e = &st->index_entries[st->nb_index_entries++];
2119  e->pos = current_offset;
2120  e->timestamp = current_dts;
2121  e->size = size;
2122  e->min_distance = 0;
2123  e->flags = AVINDEX_KEYFRAME;
2124  av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "
2125  "size %d, duration %d\n", st->index, i, current_offset, current_dts,
2126  size, samples);
2127 
2128  current_offset += size;
2129  current_dts += samples;
2130  chunk_samples -= samples;
2131  }
2132  }
2133  }
2134 }
2135 
2136 static int mov_open_dref(AVIOContext **pb, const char *src, MOVDref *ref,
2137  AVIOInterruptCB *int_cb, int use_absolute_path, AVFormatContext *fc)
2138 {
2139  /* try relative path, we do not try the absolute because it can leak information about our
2140  system to an attacker */
2141  if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
2142  char filename[1024];
2143  const char *src_path;
2144  int i, l;
2145 
2146  /* find a source dir */
2147  src_path = strrchr(src, '/');
2148  if (src_path)
2149  src_path++;
2150  else
2151  src_path = src;
2152 
2153  /* find a next level down to target */
2154  for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)
2155  if (ref->path[l] == '/') {
2156  if (i == ref->nlvl_to - 1)
2157  break;
2158  else
2159  i++;
2160  }
2161 
2162  /* compose filename if next level down to target was found */
2163  if (i == ref->nlvl_to - 1 && src_path - src < sizeof(filename)) {
2164  memcpy(filename, src, src_path - src);
2165  filename[src_path - src] = 0;
2166 
2167  for (i = 1; i < ref->nlvl_from; i++)
2168  av_strlcat(filename, "../", 1024);
2169 
2170  av_strlcat(filename, ref->path + l + 1, 1024);
2171 
2172  if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))
2173  return 0;
2174  }
2175  } else if (use_absolute_path) {
2176  av_log(fc, AV_LOG_WARNING, "Using absolute path on user request, "
2177  "this is a possible security issue\n");
2178  if (!avio_open2(pb, ref->path, AVIO_FLAG_READ, int_cb, NULL))
2179  return 0;
2180  }
2181 
2182  return AVERROR(ENOENT);
2183 }
2184 
2185 static void fix_timescale(MOVContext *c, MOVStreamContext *sc)
2186 {
2187  if (sc->time_scale <= 0) {
2188  av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", sc->ffindex);
2189  sc->time_scale = c->time_scale;
2190  if (sc->time_scale <= 0)
2191  sc->time_scale = 1;
2192  }
2193 }
2194 
2195 static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2196 {
2197  AVStream *st;
2198  MOVStreamContext *sc;
2199  int ret;
2200 
2201  st = avformat_new_stream(c->fc, NULL);
2202  if (!st) return AVERROR(ENOMEM);
2203  st->id = c->fc->nb_streams;
2204  sc = av_mallocz(sizeof(MOVStreamContext));
2205  if (!sc) return AVERROR(ENOMEM);
2206 
2207  st->priv_data = sc;
2208  st->codec->codec_type = AVMEDIA_TYPE_DATA;
2209  sc->ffindex = st->index;
2210 
2211  if ((ret = mov_read_default(c, pb, atom)) < 0)
2212  return ret;
2213 
2214  /* sanity checks */
2215  if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
2216  (!sc->sample_size && !sc->sample_count))) {
2217  av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
2218  st->index);
2219  return 0;
2220  }
2221 
2222  fix_timescale(c, sc);
2223 
2224  avpriv_set_pts_info(st, 64, 1, sc->time_scale);
2225 
2226  mov_build_index(c, st);
2227 
2228  if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
2229  MOVDref *dref = &sc->drefs[sc->dref_id - 1];
2230  if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback,
2231  c->use_absolute_path, c->fc) < 0)
2232  av_log(c->fc, AV_LOG_ERROR,
2233  "stream %d, error opening alias: path='%s', dir='%s', "
2234  "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
2235  st->index, dref->path, dref->dir, dref->filename,
2236  dref->volume, dref->nlvl_from, dref->nlvl_to);
2237  } else {
2238  sc->pb = c->fc->pb;
2239  sc->pb_is_copied = 1;
2240  }
2241 
2242  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
2243  if (!st->sample_aspect_ratio.num &&
2244  (st->codec->width != sc->width || st->codec->height != sc->height)) {
2245  st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /
2246  ((double)st->codec->width * sc->height), INT_MAX);
2247  }
2248 
2249  if (st->duration > 0)
2250  av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2251  sc->time_scale*st->nb_frames, st->duration, INT_MAX);
2252 
2253 #if FF_API_R_FRAME_RATE
2254  if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))
2255  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
2256  sc->time_scale, sc->stts_data[0].duration, INT_MAX);
2257 #endif
2258  }
2259 
2260  // done for ai5q, ai52, ai55, ai1q, ai12 and ai15.
2261  if (!st->codec->extradata_size && st->codec->codec_id == AV_CODEC_ID_H264 &&
2262  st->codec->codec_tag != MKTAG('a', 'v', 'c', '1')) {
2263  ff_generate_avci_extradata(st);
2264  }
2265 
2266  switch (st->codec->codec_id) {
2267 #if CONFIG_H261_DECODER
2268  case AV_CODEC_ID_H261:
2269 #endif
2270 #if CONFIG_H263_DECODER
2271  case AV_CODEC_ID_H263:
2272 #endif
2273 #if CONFIG_MPEG4_DECODER
2274  case AV_CODEC_ID_MPEG4:
2275 #endif
2276  st->codec->width = 0; /* let decoder init width/height */
2277  st->codec->height= 0;
2278  break;
2279  }
2280 
2281  /* Do not need those anymore. */
2282  av_freep(&sc->chunk_offsets);
2283  av_freep(&sc->stsc_data);
2284  av_freep(&sc->sample_sizes);
2285  av_freep(&sc->keyframes);
2286  av_freep(&sc->stts_data);
2287  av_freep(&sc->stps_data);
2288  av_freep(&sc->rap_group);
2289 
2290  return 0;
2291 }
2292 
2293 static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2294 {
2295  int ret;
2296  c->itunes_metadata = 1;
2297  ret = mov_read_default(c, pb, atom);
2298  c->itunes_metadata = 0;
2299  return ret;
2300 }
2301 
2302 static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2303 {
2304  while (atom.size > 8) {
2305  uint32_t tag = avio_rl32(pb);
2306  atom.size -= 4;
2307  if (tag == MKTAG('h','d','l','r')) {
2308  avio_seek(pb, -8, SEEK_CUR);
2309  atom.size += 8;
2310  return mov_read_default(c, pb, atom);
2311  }
2312  }
2313  return 0;
2314 }
2315 
2316 static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2317 {
2318  int i;
2319  int width;
2320  int height;
2321  int64_t disp_transform[2];
2322  int display_matrix[3][2];
2323  AVStream *st;
2324  MOVStreamContext *sc;
2325  int version;
2326 
2327  if (c->fc->nb_streams < 1)
2328  return 0;
2329  st = c->fc->streams[c->fc->nb_streams-1];
2330  sc = st->priv_data;
2331 
2332  version = avio_r8(pb);
2333  avio_rb24(pb); /* flags */
2334  /*
2335  MOV_TRACK_ENABLED 0x0001
2336  MOV_TRACK_IN_MOVIE 0x0002
2337  MOV_TRACK_IN_PREVIEW 0x0004
2338  MOV_TRACK_IN_POSTER 0x0008
2339  */
2340 
2341  if (version == 1) {
2342  avio_rb64(pb);
2343  avio_rb64(pb);
2344  } else {
2345  avio_rb32(pb); /* creation time */
2346  avio_rb32(pb); /* modification time */
2347  }
2348  st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/
2349  avio_rb32(pb); /* reserved */
2350 
2351  /* highlevel (considering edits) duration in movie timebase */
2352  (version == 1) ? avio_rb64(pb) : avio_rb32(pb);
2353  avio_rb32(pb); /* reserved */
2354  avio_rb32(pb); /* reserved */
2355 
2356  avio_rb16(pb); /* layer */
2357  avio_rb16(pb); /* alternate group */
2358  avio_rb16(pb); /* volume */
2359  avio_rb16(pb); /* reserved */
2360 
2361  //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)
2362  // they're kept in fixed point format through all calculations
2363  // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio
2364  for (i = 0; i < 3; i++) {
2365  display_matrix[i][0] = avio_rb32(pb); // 16.16 fixed point
2366  display_matrix[i][1] = avio_rb32(pb); // 16.16 fixed point
2367  avio_rb32(pb); // 2.30 fixed point (not used)
2368  }
2369 
2370  width = avio_rb32(pb); // 16.16 fixed point track width
2371  height = avio_rb32(pb); // 16.16 fixed point track height
2372  sc->width = width >> 16;
2373  sc->height = height >> 16;
2374 
2375  //Assign clockwise rotate values based on transform matrix so that
2376  //we can compensate for iPhone orientation during capture.
2377 
2378  if (display_matrix[1][0] == -65536 && display_matrix[0][1] == 65536) {
2379  av_dict_set(&st->metadata, "rotate", "90", 0);
2380  }
2381 
2382  if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {
2383  av_dict_set(&st->metadata, "rotate", "180", 0);
2384  }
2385 
2386  if (display_matrix[1][0] == 65536 && display_matrix[0][1] == -65536) {
2387  av_dict_set(&st->metadata, "rotate", "270", 0);
2388  }
2389 
2390  // transform the display width/height according to the matrix
2391  // skip this if the display matrix is the default identity matrix
2392  // or if it is rotating the picture, ex iPhone 3GS
2393  // to keep the same scale, use [width height 1<<16]
2394  if (width && height &&
2395  ((display_matrix[0][0] != 65536 ||
2396  display_matrix[1][1] != 65536) &&
2397  !display_matrix[0][1] &&
2398  !display_matrix[1][0] &&
2399  !display_matrix[2][0] && !display_matrix[2][1])) {
2400  for (i = 0; i < 2; i++)
2401  disp_transform[i] =
2402  (int64_t) width * display_matrix[0][i] +
2403  (int64_t) height * display_matrix[1][i] +
2404  ((int64_t) display_matrix[2][i] << 16);
2405 
2406  //sample aspect ratio is new width/height divided by old width/height
2407  st->sample_aspect_ratio = av_d2q(
2408  ((double) disp_transform[0] * height) /
2409  ((double) disp_transform[1] * width), INT_MAX);
2410  }
2411  return 0;
2412 }
2413 
2414 static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2415 {
2416  MOVFragment *frag = &c->fragment;
2417  MOVTrackExt *trex = NULL;
2418  int flags, track_id, i;
2419 
2420  avio_r8(pb); /* version */
2421  flags = avio_rb24(pb);
2422 
2423  track_id = avio_rb32(pb);
2424  if (!track_id)
2425  return AVERROR_INVALIDDATA;
2426  frag->track_id = track_id;
2427  for (i = 0; i < c->trex_count; i++)
2428  if (c->trex_data[i].track_id == frag->track_id) {
2429  trex = &c->trex_data[i];
2430  break;
2431  }
2432  if (!trex) {
2433  av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
2434  return AVERROR_INVALIDDATA;
2435  }
2436 
2437  frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?
2438  avio_rb64(pb) : frag->moof_offset;
2439  frag->stsd_id = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;
2440 
2441  frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?
2442  avio_rb32(pb) : trex->duration;
2443  frag->size = flags & MOV_TFHD_DEFAULT_SIZE ?
2444  avio_rb32(pb) : trex->size;
2445  frag->flags = flags & MOV_TFHD_DEFAULT_FLAGS ?
2446  avio_rb32(pb) : trex->flags;
2447  av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);
2448  return 0;
2449 }
2450 
2451 static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2452 {
2453  c->chapter_track = avio_rb32(pb);
2454  return 0;
2455 }
2456 
2457 static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2458 {
2459  MOVTrackExt *trex;
2460 
2461  if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))
2462  return AVERROR_INVALIDDATA;
2463  trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));
2464  if (!trex)
2465  return AVERROR(ENOMEM);
2466 
2467  c->fc->duration = AV_NOPTS_VALUE; // the duration from mvhd is not representing the whole file when fragments are used.
2468 
2469  c->trex_data = trex;
2470  trex = &c->trex_data[c->trex_count++];
2471  avio_r8(pb); /* version */
2472  avio_rb24(pb); /* flags */
2473  trex->track_id = avio_rb32(pb);
2474  trex->stsd_id = avio_rb32(pb);
2475  trex->duration = avio_rb32(pb);
2476  trex->size = avio_rb32(pb);
2477  trex->flags = avio_rb32(pb);
2478  return 0;
2479 }
2480 
2481 static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2482 {
2483  MOVFragment *frag = &c->fragment;
2484  AVStream *st = NULL;
2485  MOVStreamContext *sc;
2486  MOVStts *ctts_data;
2487  uint64_t offset;
2488  int64_t dts;
2489  int data_offset = 0;
2490  unsigned entries, first_sample_flags = frag->flags;
2491  int flags, distance, i, found_keyframe = 0;
2492 
2493  for (i = 0; i < c->fc->nb_streams; i++) {
2494  if (c->fc->streams[i]->id == frag->track_id) {
2495  st = c->fc->streams[i];
2496  break;
2497  }
2498  }
2499  if (!st) {
2500  av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);
2501  return AVERROR_INVALIDDATA;
2502  }
2503  sc = st->priv_data;
2504  if (sc->pseudo_stream_id+1 != frag->stsd_id)
2505  return 0;
2506  avio_r8(pb); /* version */
2507  flags = avio_rb24(pb);
2508  entries = avio_rb32(pb);
2509  av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);
2510 
2511  /* Always assume the presence of composition time offsets.
2512  * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.
2513  * 1) in the initial movie, there are no samples.
2514  * 2) in the first movie fragment, there is only one sample without composition time offset.
2515  * 3) in the subsequent movie fragments, there are samples with composition time offset. */
2516  if (!sc->ctts_count && sc->sample_count)
2517  {
2518  /* Complement ctts table if moov atom doesn't have ctts atom. */
2519  ctts_data = av_malloc(sizeof(*sc->ctts_data));
2520  if (!ctts_data)
2521  return AVERROR(ENOMEM);
2522  sc->ctts_data = ctts_data;
2523  sc->ctts_data[sc->ctts_count].count = sc->sample_count;
2524  sc->ctts_data[sc->ctts_count].duration = 0;
2525  sc->ctts_count++;
2526  }
2527  if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
2528  return AVERROR_INVALIDDATA;
2529  ctts_data = av_realloc(sc->ctts_data,
2530  (entries+sc->ctts_count)*sizeof(*sc->ctts_data));
2531  if (!ctts_data)
2532  return AVERROR(ENOMEM);
2533  sc->ctts_data = ctts_data;
2534 
2535  if (flags & MOV_TRUN_DATA_OFFSET) data_offset = avio_rb32(pb);
2536  if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);
2537  dts = sc->track_end - sc->time_offset;
2538  offset = frag->base_data_offset + data_offset;
2539  distance = 0;
2540  av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);
2541  for (i = 0; i < entries && !pb->eof_reached; i++) {
2542  unsigned sample_size = frag->size;
2543  int sample_flags = i ? frag->flags : first_sample_flags;
2544  unsigned sample_duration = frag->duration;
2545  int keyframe = 0;
2546 
2547  if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);
2548  if (flags & MOV_TRUN_SAMPLE_SIZE) sample_size = avio_rb32(pb);
2549  if (flags & MOV_TRUN_SAMPLE_FLAGS) sample_flags = avio_rb32(pb);
2550  sc->ctts_data[sc->ctts_count].count = 1;
2551  sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?
2552  avio_rb32(pb) : 0;
2553  sc->ctts_count++;
2554  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
2555  keyframe = 1;
2556  else if (!found_keyframe)
2557  keyframe = found_keyframe =
2558  !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |
2559  MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
2560  if (keyframe)
2561  distance = 0;
2562  av_add_index_entry(st, offset, dts, sample_size, distance,
2563  keyframe ? AVINDEX_KEYFRAME : 0);
2564  av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
2565  "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
2566  offset, dts, sample_size, distance, keyframe);
2567  distance++;
2568  dts += sample_duration;
2569  offset += sample_size;
2570  sc->data_size += sample_size;
2571  }
2572 
2573  if (pb->eof_reached)
2574  return AVERROR_EOF;
2575 
2576  frag->moof_offset = offset;
2577  st->duration = sc->track_end = dts + sc->time_offset;
2578  return 0;
2579 }
2580 
2581 /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
2582 /* like the files created with Adobe Premiere 5.0, for samples see */
2583 /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
2584 static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2585 {
2586  int err;
2587 
2588  if (atom.size < 8)
2589  return 0; /* continue */
2590  if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
2591  avio_skip(pb, atom.size - 4);
2592  return 0;
2593  }
2594  atom.type = avio_rl32(pb);
2595  atom.size -= 8;
2596  if (atom.type != MKTAG('m','d','a','t')) {
2597  avio_skip(pb, atom.size);
2598  return 0;
2599  }
2600  err = mov_read_mdat(c, pb, atom);
2601  return err;
2602 }
2603 
2604 static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2605 {
2606 #if CONFIG_ZLIB
2607  AVIOContext ctx;
2608  uint8_t *cmov_data;
2609  uint8_t *moov_data; /* uncompressed data */
2610  long cmov_len, moov_len;
2611  int ret = -1;
2612 
2613  avio_rb32(pb); /* dcom atom */
2614  if (avio_rl32(pb) != MKTAG('d','c','o','m'))
2615  return AVERROR_INVALIDDATA;
2616  if (avio_rl32(pb) != MKTAG('z','l','i','b')) {
2617  av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !\n");
2618  return AVERROR_INVALIDDATA;
2619  }
2620  avio_rb32(pb); /* cmvd atom */
2621  if (avio_rl32(pb) != MKTAG('c','m','v','d'))
2622  return AVERROR_INVALIDDATA;
2623  moov_len = avio_rb32(pb); /* uncompressed size */
2624  cmov_len = atom.size - 6 * 4;
2625 
2626  cmov_data = av_malloc(cmov_len);
2627  if (!cmov_data)
2628  return AVERROR(ENOMEM);
2629  moov_data = av_malloc(moov_len);
2630  if (!moov_data) {
2631  av_free(cmov_data);
2632  return AVERROR(ENOMEM);
2633  }
2634  avio_read(pb, cmov_data, cmov_len);
2635  if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
2636  goto free_and_return;
2637  if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
2638  goto free_and_return;
2639  atom.type = MKTAG('m','o','o','v');
2640  atom.size = moov_len;
2641  ret = mov_read_default(c, &ctx, atom);
2642 free_and_return:
2643  av_free(moov_data);
2644  av_free(cmov_data);
2645  return ret;
2646 #else
2647  av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
2648  return AVERROR(ENOSYS);
2649 #endif
2650 }
2651 
2652 /* edit list atom */
2653 static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2654 {
2655  MOVStreamContext *sc;
2656  int i, edit_count, version, edit_start_index = 0;
2657  int unsupported = 0;
2658 
2659  if (c->fc->nb_streams < 1 || c->ignore_editlist)
2660  return 0;
2661  sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;
2662 
2663  version = avio_r8(pb); /* version */
2664  avio_rb24(pb); /* flags */
2665  edit_count = avio_rb32(pb); /* entries */
2666 
2667  if ((uint64_t)edit_count*12+8 > atom.size)
2668  return AVERROR_INVALIDDATA;
2669 
2670  av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);
2671  for (i=0; i<edit_count; i++){
2672  int64_t time;
2673  int64_t duration;
2674  int rate;
2675  if (version == 1) {
2676  duration = avio_rb64(pb);
2677  time = avio_rb64(pb);
2678  } else {
2679  duration = avio_rb32(pb); /* segment duration */
2680  time = (int32_t)avio_rb32(pb); /* media time */
2681  }
2682  rate = avio_rb32(pb);
2683  if (i == 0 && time == -1) {
2684  sc->empty_duration = duration;
2685  edit_start_index = 1;
2686  } else if (i == edit_start_index && time >= 0)
2687  sc->start_time = time;
2688  else
2689  unsupported = 1;
2690 
2691  av_dlog(c->fc, "duration=%"PRId64" time=%"PRId64" rate=%f\n",
2692  duration, time, rate / 65536.0);
2693  }
2694 
2695  if (unsupported)
2696  av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "
2697  "a/v desync might occur, patch welcome\n");
2698 
2699  return 0;
2700 }
2701 
2702 static int mov_read_tmcd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2703 {
2704  MOVStreamContext *sc;
2705 
2706  if (c->fc->nb_streams < 1)
2707  return AVERROR_INVALIDDATA;
2708  sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;
2709  sc->timecode_track = avio_rb32(pb);
2710  return 0;
2711 }
2712 
2713 static const MOVParseTableEntry mov_default_parse_table[] = {
2714 { MKTAG('A','C','L','R'), mov_read_avid },
2715 { MKTAG('A','P','R','G'), mov_read_avid },
2716 { MKTAG('A','A','L','P'), mov_read_avid },
2717 { MKTAG('A','R','E','S'), mov_read_avid },
2718 { MKTAG('a','v','s','s'), mov_read_avss },
2719 { MKTAG('c','h','p','l'), mov_read_chpl },
2720 { MKTAG('c','o','6','4'), mov_read_stco },
2721 { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */
2722 { MKTAG('d','i','n','f'), mov_read_default },
2723 { MKTAG('d','r','e','f'), mov_read_dref },
2724 { MKTAG('e','d','t','s'), mov_read_default },
2725 { MKTAG('e','l','s','t'), mov_read_elst },
2726 { MKTAG('e','n','d','a'), mov_read_enda },
2727 { MKTAG('f','i','e','l'), mov_read_fiel },
2728 { MKTAG('f','t','y','p'), mov_read_ftyp },
2729 { MKTAG('g','l','b','l'), mov_read_glbl },
2730 { MKTAG('h','d','l','r'), mov_read_hdlr },
2731 { MKTAG('i','l','s','t'), mov_read_ilst },
2732 { MKTAG('j','p','2','h'), mov_read_jp2h },
2733 { MKTAG('m','d','a','t'), mov_read_mdat },
2734 { MKTAG('m','d','h','d'), mov_read_mdhd },
2735 { MKTAG('m','d','i','a'), mov_read_default },
2736 { MKTAG('m','e','t','a'), mov_read_meta },
2737 { MKTAG('m','i','n','f'), mov_read_default },
2738 { MKTAG('m','o','o','f'), mov_read_moof },
2739 { MKTAG('m','o','o','v'), mov_read_moov },
2740 { MKTAG('m','v','e','x'), mov_read_default },
2741 { MKTAG('m','v','h','d'), mov_read_mvhd },
2742 { MKTAG('S','M','I',' '), mov_read_svq3 },
2743 { MKTAG('a','l','a','c'), mov_read_alac }, /* alac specific atom */
2744 { MKTAG('a','v','c','C'), mov_read_glbl },
2745 { MKTAG('p','a','s','p'), mov_read_pasp },
2746 { MKTAG('s','t','b','l'), mov_read_default },
2747 { MKTAG('s','t','c','o'), mov_read_stco },
2748 { MKTAG('s','t','p','s'), mov_read_stps },
2749 { MKTAG('s','t','r','f'), mov_read_strf },
2750 { MKTAG('s','t','s','c'), mov_read_stsc },
2751 { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */
2752 { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */
2753 { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */
2754 { MKTAG('s','t','t','s'), mov_read_stts },
2755 { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */
2756 { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */
2757 { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */
2758 { MKTAG('t','r','a','k'), mov_read_trak },
2759 { MKTAG('t','r','a','f'), mov_read_default },
2760 { MKTAG('t','r','e','f'), mov_read_default },
2761 { MKTAG('t','m','c','d'), mov_read_tmcd },
2762 { MKTAG('c','h','a','p'), mov_read_chap },
2763 { MKTAG('t','r','e','x'), mov_read_trex },
2764 { MKTAG('t','r','u','n'), mov_read_trun },
2765 { MKTAG('u','d','t','a'), mov_read_default },
2766 { MKTAG('w','a','v','e'), mov_read_wave },
2767 { MKTAG('e','s','d','s'), mov_read_esds },
2768 { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */
2769 { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */
2770 { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
2771 { MKTAG('w','f','e','x'), mov_read_wfex },
2772 { MKTAG('c','m','o','v'), mov_read_cmov },
2773 { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */
2774 { MKTAG('d','v','c','1'), mov_read_dvc1 },
2775 { MKTAG('s','b','g','p'), mov_read_sbgp },
2776 { 0, NULL }
2777 };
2778 
2779 static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2780 {
2781  int64_t total_size = 0;
2782  MOVAtom a;
2783  int i;
2784 
2785  if (atom.size < 0)
2786  atom.size = INT64_MAX;
2787  while (total_size + 8 <= atom.size && !url_feof(pb)) {
2788  int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;
2789  a.size = atom.size;
2790  a.type=0;
2791  if (atom.size >= 8) {
2792  a.size = avio_rb32(pb);
2793  a.type = avio_rl32(pb);
2794  if (atom.type != MKTAG('r','o','o','t') &&
2795  atom.type != MKTAG('m','o','o','v'))
2796  {
2797  if (a.type == MKTAG('t','r','a','k') || a.type == MKTAG('m','d','a','t'))
2798  {
2799  av_log(c->fc, AV_LOG_ERROR, "Broken file, trak/mdat not at top-level\n");
2800  avio_skip(pb, -8);
2801  return 0;
2802  }
2803  }
2804  total_size += 8;
2805  if (a.size == 1) { /* 64 bit extended size */
2806  a.size = avio_rb64(pb) - 8;
2807  total_size += 8;
2808  }
2809  }
2810  av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",
2811  a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);
2812  if (a.size == 0) {
2813  a.size = atom.size - total_size + 8;
2814  }
2815  a.size -= 8;
2816  if (a.size < 0)
2817  break;
2818  a.size = FFMIN(a.size, atom.size - total_size);
2819 
2820  for (i = 0; mov_default_parse_table[i].type; i++)
2821  if (mov_default_parse_table[i].type == a.type) {
2822  parse = mov_default_parse_table[i].parse;
2823  break;
2824  }
2825 
2826  // container is user data
2827  if (!parse && (atom.type == MKTAG('u','d','t','a') ||
2828  atom.type == MKTAG('i','l','s','t')))
2829  parse = mov_read_udta_string;
2830 
2831  if (!parse) { /* skip leaf atoms data */
2832  avio_skip(pb, a.size);
2833  } else {
2834  int64_t start_pos = avio_tell(pb);
2835  int64_t left;
2836  int err = parse(c, pb, a);
2837  if (err < 0)
2838  return err;
2839  if (c->found_moov && c->found_mdat &&
2840  ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||
2841  start_pos + a.size == avio_size(pb))) {
2842  if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)
2843  c->next_root_atom = start_pos + a.size;
2844  return 0;
2845  }
2846  left = a.size - avio_tell(pb) + start_pos;
2847  if (left > 0) /* skip garbage at atom end */
2848  avio_skip(pb, left);
2849  else if(left < 0) {
2850  av_log(c->fc, AV_LOG_DEBUG, "undoing overread of %"PRId64" in '%.4s'\n", -left, (char*)&a.type);
2851  avio_seek(pb, left, SEEK_CUR);
2852  }
2853  }
2854 
2855  total_size += a.size;
2856  }
2857 
2858  if (total_size < atom.size && atom.size < 0x7ffff)
2859  avio_skip(pb, atom.size - total_size);
2860 
2861  return 0;
2862 }
2863 
2864 static int mov_probe(AVProbeData *p)
2865 {
2866  int64_t offset;
2867  uint32_t tag;
2868  int score = 0;
2869  int moov_offset = -1;
2870 
2871  /* check file header */
2872  offset = 0;
2873  for (;;) {
2874  /* ignore invalid offset */
2875  if ((offset + 8) > (unsigned int)p->buf_size)
2876  break;
2877  tag = AV_RL32(p->buf + offset + 4);
2878  switch(tag) {
2879  /* check for obvious tags */
2880  case MKTAG('m','o','o','v'):
2881  moov_offset = offset + 4;
2882  case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */
2883  case MKTAG('m','d','a','t'):
2884  case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
2885  case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
2886  case MKTAG('f','t','y','p'):
2887  if (AV_RB32(p->buf+offset) < 8 &&
2888  (AV_RB32(p->buf+offset) != 1 ||
2889  offset + 12 > (unsigned int)p->buf_size ||
2890  AV_RB64(p->buf+offset + 8) == 0)) {
2891  score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
2892  } else {
2893  score = AVPROBE_SCORE_MAX;
2894  }
2895  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2896  break;
2897  /* those are more common words, so rate then a bit less */
2898  case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
2899  case MKTAG('w','i','d','e'):
2900  case MKTAG('f','r','e','e'):
2901  case MKTAG('j','u','n','k'):
2902  case MKTAG('p','i','c','t'):
2903  score = FFMAX(score, AVPROBE_SCORE_MAX - 5);
2904  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2905  break;
2906  case MKTAG(0x82,0x82,0x7f,0x7d):
2907  case MKTAG('s','k','i','p'):
2908  case MKTAG('u','u','i','d'):
2909  case MKTAG('p','r','f','l'):
2910  /* if we only find those cause probedata is too small at least rate them */
2911  score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
2912  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2913  break;
2914  default:
2915  offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
2916  }
2917  }
2918  if(score > AVPROBE_SCORE_MAX - 50 && moov_offset != -1) {
2919  /* moov atom in the header - we should make sure that this is not a
2920  * MOV-packed MPEG-PS */
2921  offset = moov_offset;
2922 
2923  while(offset < (p->buf_size - 16)){ /* Sufficient space */
2924  /* We found an actual hdlr atom */
2925  if(AV_RL32(p->buf + offset ) == MKTAG('h','d','l','r') &&
2926  AV_RL32(p->buf + offset + 8) == MKTAG('m','h','l','r') &&
2927  AV_RL32(p->buf + offset + 12) == MKTAG('M','P','E','G')){
2928  av_log(NULL, AV_LOG_WARNING, "Found media data tag MPEG indicating this is a MOV-packed MPEG-PS.\n");
2929  /* We found a media handler reference atom describing an
2930  * MPEG-PS-in-MOV, return a
2931  * low score to force expanding the probe window until
2932  * mpegps_probe finds what it needs */
2933  return 5;
2934  }else
2935  /* Keep looking */
2936  offset+=2;
2937  }
2938  }
2939 
2940  return score;
2941 }
2942 
2943 // must be done after parsing all trak because there's no order requirement
2944 static void mov_read_chapters(AVFormatContext *s)
2945 {
2946  MOVContext *mov = s->priv_data;
2947  AVStream *st = NULL;
2948  MOVStreamContext *sc;
2949  int64_t cur_pos;
2950  int i;
2951 
2952  for (i = 0; i < s->nb_streams; i++)
2953  if (s->streams[i]->id == mov->chapter_track) {
2954  st = s->streams[i];
2955  break;
2956  }
2957  if (!st) {
2958  av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
2959  return;
2960  }
2961 
2962  st->discard = AVDISCARD_ALL;
2963  sc = st->priv_data;
2964  cur_pos = avio_tell(sc->pb);
2965 
2966  for (i = 0; i < st->nb_index_entries; i++) {
2967  AVIndexEntry *sample = &st->index_entries[i];
2968  int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
2969  uint8_t *title;
2970  uint16_t ch;
2971  int len, title_len;
2972 
2973  if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
2974  av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);
2975  goto finish;
2976  }
2977 
2978  // the first two bytes are the length of the title
2979  len = avio_rb16(sc->pb);
2980  if (len > sample->size-2)
2981  continue;
2982  title_len = 2*len + 1;
2983  if (!(title = av_mallocz(title_len)))
2984  goto finish;
2985 
2986  // The samples could theoretically be in any encoding if there's an encd
2987  // atom following, but in practice are only utf-8 or utf-16, distinguished
2988  // instead by the presence of a BOM
2989  if (!len) {
2990  title[0] = 0;
2991  } else {
2992  ch = avio_rb16(sc->pb);
2993  if (ch == 0xfeff)
2994  avio_get_str16be(sc->pb, len, title, title_len);
2995  else if (ch == 0xfffe)
2996  avio_get_str16le(sc->pb, len, title, title_len);
2997  else {
2998  AV_WB16(title, ch);
2999  if (len == 1 || len == 2)
3000  title[len] = 0;
3001  else
3002  avio_get_str(sc->pb, INT_MAX, title + 2, len - 1);
3003  }
3004  }
3005 
3006  avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);
3007  av_freep(&title);
3008  }
3009 finish:
3010  avio_seek(sc->pb, cur_pos, SEEK_SET);
3011 }
3012 
3013 static int parse_timecode_in_framenum_format(AVFormatContext *s, AVStream *st,
3014  uint32_t value, int flags)
3015 {
3016  AVTimecode tc;
3017  char buf[AV_TIMECODE_STR_SIZE];
3018  AVRational rate = {st->codec->time_base.den,
3019  st->codec->time_base.num};
3020  int ret = av_timecode_init(&tc, rate, flags, 0, s);
3021  if (ret < 0)
3022  return ret;
3023  av_dict_set(&st->metadata, "timecode",
3024  av_timecode_make_string(&tc, buf, value), 0);
3025  return 0;
3026 }
3027 
3028 static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
3029 {
3030  MOVStreamContext *sc = st->priv_data;
3031  int flags = 0;
3032  int64_t cur_pos = avio_tell(sc->pb);
3033  uint32_t value;
3034 
3035  if (!st->nb_index_entries)
3036  return -1;
3037 
3038  avio_seek(sc->pb, st->index_entries->pos, SEEK_SET);
3039  value = avio_rb32(s->pb);
3040 
3041  if (sc->tmcd_flags & 0x0001) flags |= AV_TIMECODE_FLAG_DROPFRAME;
3042  if (sc->tmcd_flags & 0x0002) flags |= AV_TIMECODE_FLAG_24HOURSMAX;
3043  if (sc->tmcd_flags & 0x0004) flags |= AV_TIMECODE_FLAG_ALLOWNEGATIVE;
3044 
3045  /* Assume Counter flag is set to 1 in tmcd track (even though it is likely
3046  * not the case) and thus assume "frame number format" instead of QT one.
3047  * No sample with tmcd track can be found with a QT timecode at the moment,
3048  * despite what the tmcd track "suggests" (Counter flag set to 0 means QT
3049  * format). */
3050  parse_timecode_in_framenum_format(s, st, value, flags);
3051 
3052  avio_seek(sc->pb, cur_pos, SEEK_SET);
3053  return 0;
3054 }
3055 
3056 static int mov_read_close(AVFormatContext *s)
3057 {
3058  MOVContext *mov = s->priv_data;
3059  int i, j;
3060 
3061  for (i = 0; i < s->nb_streams; i++) {
3062  AVStream *st = s->streams[i];
3063  MOVStreamContext *sc = st->priv_data;
3064 
3065  av_freep(&sc->ctts_data);
3066  for (j = 0; j < sc->drefs_count; j++) {
3067  av_freep(&sc->drefs[j].path);
3068  av_freep(&sc->drefs[j].dir);
3069  }
3070  av_freep(&sc->drefs);
3071  if (!sc->pb_is_copied)
3072  avio_close(sc->pb);
3073  sc->pb = NULL;
3074  av_freep(&sc->chunk_offsets);
3075  av_freep(&sc->keyframes);
3076  av_freep(&sc->sample_sizes);
3077  av_freep(&sc->stps_data);
3078  av_freep(&sc->stsc_data);
3079  av_freep(&sc->stts_data);
3080  }
3081 
3082  if (mov->dv_demux) {
3083  for (i = 0; i < mov->dv_fctx->nb_streams; i++) {
3084  av_freep(&mov->dv_fctx->streams[i]->codec);
3085  av_freep(&mov->dv_fctx->streams[i]);
3086  }
3087  av_freep(&mov->dv_fctx);
3088  av_freep(&mov->dv_demux);
3089  }
3090 
3091  av_freep(&mov->trex_data);
3092 
3093  return 0;
3094 }
3095 
3096 static int tmcd_is_referenced(AVFormatContext *s, int tmcd_id)
3097 {
3098  int i;
3099 
3100  for (i = 0; i < s->nb_streams; i++) {
3101  AVStream *st = s->streams[i];
3102  MOVStreamContext *sc = st->priv_data;
3103 
3104  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
3105  sc->timecode_track == tmcd_id)
3106  return 1;
3107  }
3108  return 0;
3109 }
3110 
3111 /* look for a tmcd track not referenced by any video track, and export it globally */
3112 static void export_orphan_timecode(AVFormatContext *s)
3113 {
3114  int i;
3115 
3116  for (i = 0; i < s->nb_streams; i++) {
3117  AVStream *st = s->streams[i];
3118 
3119  if (st->codec->codec_tag == MKTAG('t','m','c','d') &&
3120  !tmcd_is_referenced(s, i + 1)) {
3121  AVDictionaryEntry *tcr = av_dict_get(st->metadata, "timecode", NULL, 0);
3122  if (tcr) {
3123  av_dict_set(&s->metadata, "timecode", tcr->value, 0);
3124  break;
3125  }
3126  }
3127  }
3128 }
3129 
3130 static int mov_read_header(AVFormatContext *s)
3131 {
3132  MOVContext *mov = s->priv_data;
3133  AVIOContext *pb = s->pb;
3134  int i, j, err;
3135  MOVAtom atom = { AV_RL32("root") };
3136 
3137  mov->fc = s;
3138  /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
3139  if (pb->seekable)
3140  atom.size = avio_size(pb);
3141  else
3142  atom.size = INT64_MAX;
3143 
3144  /* check MOV header */
3145  if ((err = mov_read_default(mov, pb, atom)) < 0) {
3146  av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);
3147  mov_read_close(s);
3148  return err;
3149  }
3150  if (!mov->found_moov) {
3151  av_log(s, AV_LOG_ERROR, "moov atom not found\n");
3152  mov_read_close(s);
3153  return AVERROR_INVALIDDATA;
3154  }
3155  av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));
3156 
3157  if (pb->seekable) {
3158  if (mov->chapter_track > 0)
3159  mov_read_chapters(s);
3160  for (i = 0; i < s->nb_streams; i++)
3161  if (s->streams[i]->codec->codec_tag == AV_RL32("tmcd"))
3162  mov_read_timecode_track(s, s->streams[i]);
3163  }
3164 
3165  /* copy timecode metadata from tmcd tracks to the related video streams */
3166  for (i = 0; i < s->nb_streams; i++) {
3167  AVStream *st = s->streams[i];
3168  MOVStreamContext *sc = st->priv_data;
3169  if (sc->timecode_track > 0) {
3170  AVDictionaryEntry *tcr;
3171  int tmcd_st_id = -1;
3172 
3173  for (j = 0; j < s->nb_streams; j++)
3174  if (s->streams[j]->id == sc->timecode_track)
3175  tmcd_st_id = j;
3176 
3177  if (tmcd_st_id < 0 || tmcd_st_id == i)
3178  continue;
3179  tcr = av_dict_get(s->streams[tmcd_st_id]->metadata, "timecode", NULL, 0);
3180  if (tcr)
3181  av_dict_set(&st->metadata, "timecode", tcr->value, 0);
3182  }
3183  }
3184  export_orphan_timecode(s);
3185 
3186  for (i = 0; i < s->nb_streams; i++) {
3187  AVStream *st = s->streams[i];
3188  MOVStreamContext *sc = st->priv_data;
3189  fix_timescale(mov, sc);
3190  if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->codec_id == AV_CODEC_ID_AAC) {
3191  st->skip_samples = sc->start_pad;
3192  }
3193  }
3194 
3195  if (mov->trex_data) {
3196  for (i = 0; i < s->nb_streams; i++) {
3197  AVStream *st = s->streams[i];
3198  MOVStreamContext *sc = st->priv_data;
3199  if (st->duration)
3200  st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;
3201  }
3202  }
3203 
3204  return 0;
3205 }
3206 
3207 static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
3208 {
3209  AVIndexEntry *sample = NULL;
3210  int64_t best_dts = INT64_MAX;
3211  int i;
3212  for (i = 0; i < s->nb_streams; i++) {
3213  AVStream *avst = s->streams[i];
3214  MOVStreamContext *msc = avst->priv_data;
3215  if (msc->pb && msc->current_sample < avst->nb_index_entries) {
3216  AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
3217  int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
3218  av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
3219  if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||
3220  (s->pb->seekable &&
3221  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
3222  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
3223  (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
3224  sample = current_sample;
3225  best_dts = dts;
3226  *st = avst;
3227  }
3228  }
3229  }
3230  return sample;
3231 }
3232 
3233 static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
3234 {
3235  MOVContext *mov = s->priv_data;
3236  MOVStreamContext *sc;
3237  AVIndexEntry *sample;
3238  AVStream *st = NULL;
3239  int ret;
3240  mov->fc = s;
3241  retry:
3242  sample = mov_find_next_sample(s, &st);
3243  if (!sample) {
3244  mov->found_mdat = 0;
3245  if (!mov->next_root_atom)
3246  return AVERROR_EOF;
3247  avio_seek(s->pb, mov->next_root_atom, SEEK_SET);
3248  mov->next_root_atom = 0;
3249  if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
3250  url_feof(s->pb))
3251  return AVERROR_EOF;
3252  av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
3253  goto retry;
3254  }
3255  sc = st->priv_data;
3256  /* must be done just before reading, to avoid infinite loop on sample */
3257  sc->current_sample++;
3258 
3259  if (st->discard != AVDISCARD_ALL) {
3260  if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
3261  av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
3262  sc->ffindex, sample->pos);
3263  return AVERROR_INVALIDDATA;
3264  }
3265  ret = av_get_packet(sc->pb, pkt, sample->size);
3266  if (ret < 0)
3267  return ret;
3268  if (sc->has_palette) {
3269  uint8_t *pal;
3270 
3271  pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
3272  if (!pal) {
3273  av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");
3274  } else {
3275  memcpy(pal, sc->palette, AVPALETTE_SIZE);
3276  sc->has_palette = 0;
3277  }
3278  }
3279 #if CONFIG_DV_DEMUXER
3280  if (mov->dv_demux && sc->dv_audio_container) {
3281  avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size, pkt->pos);
3282  av_free(pkt->data);
3283  pkt->size = 0;
3284  ret = avpriv_dv_get_packet(mov->dv_demux, pkt);
3285  if (ret < 0)
3286  return ret;
3287  }
3288 #endif
3289  }
3290 
3291  pkt->stream_index = sc->ffindex;
3292  pkt->dts = sample->timestamp;
3293  if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {
3294  pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
3295  /* update ctts context */
3296  sc->ctts_sample++;
3297  if (sc->ctts_index < sc->ctts_count &&
3298  sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
3299  sc->ctts_index++;
3300  sc->ctts_sample = 0;
3301  }
3302  if (sc->wrong_dts)
3303  pkt->dts = AV_NOPTS_VALUE;
3304  } else {
3305  int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?
3306  st->index_entries[sc->current_sample].timestamp : st->duration;
3307  pkt->duration = next_dts - pkt->dts;
3308  pkt->pts = pkt->dts;
3309  }
3310  if (st->discard == AVDISCARD_ALL)
3311  goto retry;
3312  pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
3313  pkt->pos = sample->pos;
3314  av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",
3315  pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
3316  return 0;
3317 }
3318 
3319 static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
3320 {
3321  MOVStreamContext *sc = st->priv_data;
3322  int sample, time_sample;
3323  int i;
3324 
3325  sample = av_index_search_timestamp(st, timestamp, flags);
3326  av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
3327  if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)
3328  sample = 0;
3329  if (sample < 0) /* not sure what to do */
3330  return AVERROR_INVALIDDATA;
3331  sc->current_sample = sample;
3332  av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);
3333  /* adjust ctts index */
3334  if (sc->ctts_data) {
3335  time_sample = 0;
3336  for (i = 0; i < sc->ctts_count; i++) {
3337  int next = time_sample + sc->ctts_data[i].count;
3338  if (next > sc->current_sample) {
3339  sc->ctts_index = i;
3340  sc->ctts_sample = sc->current_sample - time_sample;
3341  break;
3342  }
3343  time_sample = next;
3344  }
3345  }
3346  return sample;
3347 }
3348 
3349 static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
3350 {
3351  AVStream *st;
3352  int64_t seek_timestamp, timestamp;
3353  int sample;
3354  int i;
3355 
3356  if (stream_index >= s->nb_streams)
3357  return AVERROR_INVALIDDATA;
3358 
3359  st = s->streams[stream_index];
3360  sample = mov_seek_stream(s, st, sample_time, flags);
3361  if (sample < 0)
3362  return sample;
3363 
3364  /* adjust seek timestamp to found sample timestamp */
3365  seek_timestamp = st->index_entries[sample].timestamp;
3366 
3367  for (i = 0; i < s->nb_streams; i++) {
3368  MOVStreamContext *sc = s->streams[i]->priv_data;
3369  st = s->streams[i];
3370  st->skip_samples = (sample_time <= 0) ? sc->start_pad : 0;
3371 
3372  if (stream_index == i)
3373  continue;
3374 
3375  timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
3376  mov_seek_stream(s, st, timestamp, flags);
3377  }
3378  return 0;
3379 }
3380 
3381 static const AVOption options[] = {
3382  {"use_absolute_path",
3383  "allow using absolute path when opening alias, this is a possible security issue",
3384  offsetof(MOVContext, use_absolute_path), FF_OPT_TYPE_INT, {.i64 = 0},
3385  0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},
3386  {"ignore_editlist", "", offsetof(MOVContext, ignore_editlist), FF_OPT_TYPE_INT, {.i64 = 0},
3387  0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},
3388  {NULL}
3389 };
3390 
3391 static const AVClass class = {
3392  .class_name = "mov,mp4,m4a,3gp,3g2,mj2",
3393  .item_name = av_default_item_name,
3394  .option = options,
3395  .version = LIBAVUTIL_VERSION_INT,
3396 };
3397 
3398 AVInputFormat ff_mov_demuxer = {
3399  .name = "mov,mp4,m4a,3gp,3g2,mj2",
3400  .long_name = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),
3401  .priv_data_size = sizeof(MOVContext),
3402  .read_probe = mov_probe,
3403  .read_header = mov_read_header,
3404  .read_packet = mov_read_packet,
3405  .read_close = mov_read_close,
3406  .read_seek = mov_read_seek,
3407  .priv_class = &class,
3408  .flags = AVFMT_NO_BYTE_SEEK,
3409 };
Generated on Sun May 19 2013 19:21:04 for FFmpeg by   doxygen 1.8.2