mov.c
Go to the documentation of this file.
1 /*
2  * MOV demuxer
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <limits.h>
24 
25 //#define DEBUG
26 //#define MOV_EXPORT_ALL_METADATA
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/intfloat.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/dict.h"
35 #include "libavcodec/ac3tab.h"
36 #include "avformat.h"
37 #include "internal.h"
38 #include "avio_internal.h"
39 #include "riff.h"
40 #include "isom.h"
41 #include "libavcodec/get_bits.h"
42 #include "id3v1.h"
43 #include "mov_chan.h"
44 
45 #if CONFIG_ZLIB
46 #include <zlib.h>
47 #endif
48 
49 /*
50  * First version by Francois Revol revol@free.fr
51  * Seek function by Gael Chardon gael.dev@4now.net
52  */
53 
54 #include "qtpalette.h"
55 
56 
57 #undef NDEBUG
58 #include <assert.h>
59 
60 /* those functions parse an atom */
61 /* links atom IDs to parse functions */
62 typedef struct MOVParseTableEntry {
63  uint32_t type;
64  int (*parse)(MOVContext *ctx, AVIOContext *pb, MOVAtom atom);
65 } MOVParseTableEntry;
66 
67 static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom);
68 
69 static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
70  unsigned len, const char *key)
71 {
72  char buf[16];
73 
74  short current, total = 0;
75  avio_rb16(pb); // unknown
76  current = avio_rb16(pb);
77  if (len >= 6)
78  total = avio_rb16(pb);
79  if (!total)
80  snprintf(buf, sizeof(buf), "%d", current);
81  else
82  snprintf(buf, sizeof(buf), "%d/%d", current, total);
83  av_dict_set(&c->fc->metadata, key, buf, 0);
84 
85  return 0;
86 }
87 
88 static int mov_metadata_int8_bypass_padding(MOVContext *c, AVIOContext *pb,
89  unsigned len, const char *key)
90 {
91  char buf[16];
92 
93  /* bypass padding bytes */
94  avio_r8(pb);
95  avio_r8(pb);
96  avio_r8(pb);
97 
98  snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
99  av_dict_set(&c->fc->metadata, key, buf, 0);
100 
101  return 0;
102 }
103 
104 static int mov_metadata_int8_no_padding(MOVContext *c, AVIOContext *pb,
105  unsigned len, const char *key)
106 {
107  char buf[16];
108 
109  snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
110  av_dict_set(&c->fc->metadata, key, buf, 0);
111 
112  return 0;
113 }
114 
115 static int mov_metadata_gnre(MOVContext *c, AVIOContext *pb,
116  unsigned len, const char *key)
117 {
118  short genre;
119  char buf[20];
120 
121  avio_r8(pb); // unknown
122 
123  genre = avio_r8(pb);
124  if (genre < 1 || genre > ID3v1_GENRE_MAX)
125  return 0;
126  snprintf(buf, sizeof(buf), "%s", ff_id3v1_genre_str[genre-1]);
127  av_dict_set(&c->fc->metadata, key, buf, 0);
128 
129  return 0;
130 }
131 
132 static const uint32_t mac_to_unicode[128] = {
133  0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,
134  0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,
135  0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,
136  0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,
137  0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,
138  0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,
139  0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,
140  0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,
141  0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,
142  0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,
143  0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,
144  0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,
145  0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,
146  0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,
147  0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,
148  0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,
149 };
150 
151 static int mov_read_mac_string(MOVContext *c, AVIOContext *pb, int len,
152  char *dst, int dstlen)
153 {
154  char *p = dst;
155  char *end = dst+dstlen-1;
156  int i;
157 
158  for (i = 0; i < len; i++) {
159  uint8_t t, c = avio_r8(pb);
160  if (c < 0x80 && p < end)
161  *p++ = c;
162  else
163  PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);
164  }
165  *p = 0;
166  return p - dst;
167 }
168 
169 static int mov_read_covr(MOVContext *c, AVIOContext *pb, int type, int len)
170 {
171  AVPacket pkt;
172  AVStream *st;
173  MOVStreamContext *sc;
174  enum AVCodecID id;
175  int ret;
176 
177  switch (type) {
178  case 0xd: id = AV_CODEC_ID_MJPEG; break;
179  case 0xe: id = AV_CODEC_ID_PNG; break;
180  case 0x1b: id = AV_CODEC_ID_BMP; break;
181  default:
182  av_log(c->fc, AV_LOG_WARNING, "Unknown cover type: 0x%x.\n", type);
183  avio_skip(pb, len);
184  return 0;
185  }
186 
187  st = avformat_new_stream(c->fc, NULL);
188  if (!st)
189  return AVERROR(ENOMEM);
190  sc = av_mallocz(sizeof(*sc));
191  if (!sc)
192  return AVERROR(ENOMEM);
193  st->priv_data = sc;
194 
195  ret = av_get_packet(pb, &pkt, len);
196  if (ret < 0)
197  return ret;
198 
199  st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
200 
201  st->attached_pic = pkt;
202  st->attached_pic.stream_index = st->index;
203  st->attached_pic.flags |= AV_PKT_FLAG_KEY;
204 
205  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
206  st->codec->codec_id = id;
207 
208  return 0;
209 }
210 
211 static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
212 {
213 #ifdef MOV_EXPORT_ALL_METADATA
214  char tmp_key[5];
215 #endif
216  char str[1024], key2[16], language[4] = {0};
217  const char *key = NULL;
218  uint16_t langcode = 0;
219  uint32_t data_type = 0, str_size;
220  int (*parse)(MOVContext*, AVIOContext*, unsigned, const char*) = NULL;
221 
222  switch (atom.type) {
223  case MKTAG(0xa9,'n','a','m'): key = "title"; break;
224  case MKTAG(0xa9,'a','u','t'):
225  case MKTAG(0xa9,'A','R','T'): key = "artist"; break;
226  case MKTAG( 'a','A','R','T'): key = "album_artist"; break;
227  case MKTAG(0xa9,'w','r','t'): key = "composer"; break;
228  case MKTAG( 'c','p','r','t'):
229  case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;
230  case MKTAG(0xa9,'c','m','t'):
231  case MKTAG(0xa9,'i','n','f'): key = "comment"; break;
232  case MKTAG(0xa9,'a','l','b'): key = "album"; break;
233  case MKTAG(0xa9,'d','a','y'): key = "date"; break;
234  case MKTAG(0xa9,'g','e','n'): key = "genre"; break;
235  case MKTAG( 'g','n','r','e'): key = "genre";
236  parse = mov_metadata_gnre; break;
237  case MKTAG(0xa9,'t','o','o'):
238  case MKTAG(0xa9,'s','w','r'): key = "encoder"; break;
239  case MKTAG(0xa9,'e','n','c'): key = "encoder"; break;
240  case MKTAG( 'd','e','s','c'): key = "description";break;
241  case MKTAG( 'l','d','e','s'): key = "synopsis"; break;
242  case MKTAG( 't','v','s','h'): key = "show"; break;
243  case MKTAG( 't','v','e','n'): key = "episode_id";break;
244  case MKTAG( 't','v','n','n'): key = "network"; break;
245  case MKTAG( 't','r','k','n'): key = "track";
246  parse = mov_metadata_track_or_disc_number; break;
247  case MKTAG( 'd','i','s','k'): key = "disc";
248  parse = mov_metadata_track_or_disc_number; break;
249  case MKTAG( 't','v','e','s'): key = "episode_sort";
250  parse = mov_metadata_int8_bypass_padding; break;
251  case MKTAG( 't','v','s','n'): key = "season_number";
252  parse = mov_metadata_int8_bypass_padding; break;
253  case MKTAG( 's','t','i','k'): key = "media_type";
254  parse = mov_metadata_int8_no_padding; break;
255  case MKTAG( 'h','d','v','d'): key = "hd_video";
256  parse = mov_metadata_int8_no_padding; break;
257  case MKTAG( 'p','g','a','p'): key = "gapless_playback";
258  parse = mov_metadata_int8_no_padding; break;
259  }
260 
261  if (c->itunes_metadata && atom.size > 8) {
262  int data_size = avio_rb32(pb);
263  int tag = avio_rl32(pb);
264  if (tag == MKTAG('d','a','t','a')) {
265  data_type = avio_rb32(pb); // type
266  avio_rb32(pb); // unknown
267  str_size = data_size - 16;
268  atom.size -= 16;
269 
270  if (atom.type == MKTAG('c', 'o', 'v', 'r')) {
271  int ret = mov_read_covr(c, pb, data_type, str_size);
272  if (ret < 0) {
273  av_log(c->fc, AV_LOG_ERROR, "Error parsing cover art.\n");
274  return ret;
275  }
276  }
277  } else return 0;
278  } else if (atom.size > 4 && key && !c->itunes_metadata) {
279  str_size = avio_rb16(pb); // string length
280  langcode = avio_rb16(pb);
281  ff_mov_lang_to_iso639(langcode, language);
282  atom.size -= 4;
283  } else
284  str_size = atom.size;
285 
286 #ifdef MOV_EXPORT_ALL_METADATA
287  if (!key) {
288  snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);
289  key = tmp_key;
290  }
291 #endif
292 
293  if (!key)
294  return 0;
295  if (atom.size < 0)
296  return AVERROR_INVALIDDATA;
297 
298  str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);
299 
300  if (parse)
301  parse(c, pb, str_size, key);
302  else {
303  if (data_type == 3 || (data_type == 0 && langcode < 0x800)) { // MAC Encoded
304  mov_read_mac_string(c, pb, str_size, str, sizeof(str));
305  } else {
306  avio_read(pb, str, str_size);
307  str[str_size] = 0;
308  }
309  av_dict_set(&c->fc->metadata, key, str, 0);
310  if (*language && strcmp(language, "und")) {
311  snprintf(key2, sizeof(key2), "%s-%s", key, language);
312  av_dict_set(&c->fc->metadata, key2, str, 0);
313  }
314  }
315  av_dlog(c->fc, "lang \"%3s\" ", language);
316  av_dlog(c->fc, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %"PRId64"\n",
317  key, str, (char*)&atom.type, str_size, atom.size);
318 
319  return 0;
320 }
321 
322 static int mov_read_chpl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
323 {
324  int64_t start;
325  int i, nb_chapters, str_len, version;
326  char str[256+1];
327 
328  if ((atom.size -= 5) < 0)
329  return 0;
330 
331  version = avio_r8(pb);
332  avio_rb24(pb);
333  if (version)
334  avio_rb32(pb); // ???
335  nb_chapters = avio_r8(pb);
336 
337  for (i = 0; i < nb_chapters; i++) {
338  if (atom.size < 9)
339  return 0;
340 
341  start = avio_rb64(pb);
342  str_len = avio_r8(pb);
343 
344  if ((atom.size -= 9+str_len) < 0)
345  return 0;
346 
347  avio_read(pb, str, str_len);
348  str[str_len] = 0;
349  avpriv_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);
350  }
351  return 0;
352 }
353 
354 #define MIN_DATA_ENTRY_BOX_SIZE 12
355 static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
356 {
357  AVStream *st;
358  MOVStreamContext *sc;
359  int entries, i, j;
360 
361  if (c->fc->nb_streams < 1)
362  return 0;
363  st = c->fc->streams[c->fc->nb_streams-1];
364  sc = st->priv_data;
365 
366  avio_rb32(pb); // version + flags
367  entries = avio_rb32(pb);
368  if (entries > (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||
369  entries >= UINT_MAX / sizeof(*sc->drefs))
370  return AVERROR_INVALIDDATA;
371  av_free(sc->drefs);
372  sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
373  if (!sc->drefs)
374  return AVERROR(ENOMEM);
375  sc->drefs_count = entries;
376 
377  for (i = 0; i < sc->drefs_count; i++) {
378  MOVDref *dref = &sc->drefs[i];
379  uint32_t size = avio_rb32(pb);
380  int64_t next = avio_tell(pb) + size - 4;
381 
382  if (size < 12)
383  return AVERROR_INVALIDDATA;
384 
385  dref->type = avio_rl32(pb);
386  avio_rb32(pb); // version + flags
387  av_dlog(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);
388 
389  if (dref->type == MKTAG('a','l','i','s') && size > 150) {
390  /* macintosh alias record */
391  uint16_t volume_len, len;
392  int16_t type;
393 
394  avio_skip(pb, 10);
395 
396  volume_len = avio_r8(pb);
397  volume_len = FFMIN(volume_len, 27);
398  avio_read(pb, dref->volume, 27);
399  dref->volume[volume_len] = 0;
400  av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);
401 
402  avio_skip(pb, 12);
403 
404  len = avio_r8(pb);
405  len = FFMIN(len, 63);
406  avio_read(pb, dref->filename, 63);
407  dref->filename[len] = 0;
408  av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);
409 
410  avio_skip(pb, 16);
411 
412  /* read next level up_from_alias/down_to_target */
413  dref->nlvl_from = avio_rb16(pb);
414  dref->nlvl_to = avio_rb16(pb);
415  av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
416  dref->nlvl_from, dref->nlvl_to);
417 
418  avio_skip(pb, 16);
419 
420  for (type = 0; type != -1 && avio_tell(pb) < next; ) {
421  if (pb->eof_reached)
422  return AVERROR_EOF;
423  type = avio_rb16(pb);
424  len = avio_rb16(pb);
425  av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
426  if (len&1)
427  len += 1;
428  if (type == 2) { // absolute path
429  av_free(dref->path);
430  dref->path = av_mallocz(len+1);
431  if (!dref->path)
432  return AVERROR(ENOMEM);
433  avio_read(pb, dref->path, len);
434  if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
435  len -= volume_len;
436  memmove(dref->path, dref->path+volume_len, len);
437  dref->path[len] = 0;
438  }
439  for (j = 0; j < len; j++)
440  if (dref->path[j] == ':')
441  dref->path[j] = '/';
442  av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
443  } else if (type == 0) { // directory name
444  av_free(dref->dir);
445  dref->dir = av_malloc(len+1);
446  if (!dref->dir)
447  return AVERROR(ENOMEM);
448  avio_read(pb, dref->dir, len);
449  dref->dir[len] = 0;
450  for (j = 0; j < len; j++)
451  if (dref->dir[j] == ':')
452  dref->dir[j] = '/';
453  av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
454  } else
455  avio_skip(pb, len);
456  }
457  }
458  avio_seek(pb, next, SEEK_SET);
459  }
460  return 0;
461 }
462 
463 static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
464 {
465  AVStream *st;
466  uint32_t type;
467  uint32_t av_unused ctype;
468 
469  if (c->fc->nb_streams < 1) // meta before first trak
470  return 0;
471 
472  st = c->fc->streams[c->fc->nb_streams-1];
473 
474  avio_r8(pb); /* version */
475  avio_rb24(pb); /* flags */
476 
477  /* component type */
478  ctype = avio_rl32(pb);
479  type = avio_rl32(pb); /* component subtype */
480 
481  av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
482  av_dlog(c->fc, "stype= %.4s\n", (char*)&type);
483 
484  if (type == MKTAG('v','i','d','e'))
485  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
486  else if (type == MKTAG('s','o','u','n'))
487  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
488  else if (type == MKTAG('m','1','a',' '))
489  st->codec->codec_id = AV_CODEC_ID_MP2;
490  else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))
491  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
492 
493  avio_rb32(pb); /* component manufacture */
494  avio_rb32(pb); /* component flags */
495  avio_rb32(pb); /* component flags mask */
496 
497  return 0;
498 }
499 
500 int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
501 {
502  AVStream *st;
503  int tag;
504 
505  if (fc->nb_streams < 1)
506  return 0;
507  st = fc->streams[fc->nb_streams-1];
508 
509  avio_rb32(pb); /* version + flags */
510  ff_mp4_read_descr(fc, pb, &tag);
511  if (tag == MP4ESDescrTag) {
512  ff_mp4_parse_es_descr(pb, NULL);
513  } else
514  avio_rb16(pb); /* ID */
515 
516  ff_mp4_read_descr(fc, pb, &tag);
517  if (tag == MP4DecConfigDescrTag)
518  ff_mp4_read_dec_config_descr(fc, st, pb);
519  return 0;
520 }
521 
522 static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)
523 {
524  return ff_mov_read_esds(c->fc, pb, atom);
525 }
526 
527 static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
528 {
529  AVStream *st;
530  int ac3info, acmod, lfeon, bsmod;
531 
532  if (c->fc->nb_streams < 1)
533  return 0;
534  st = c->fc->streams[c->fc->nb_streams-1];
535 
536  ac3info = avio_rb24(pb);
537  bsmod = (ac3info >> 14) & 0x7;
538  acmod = (ac3info >> 11) & 0x7;
539  lfeon = (ac3info >> 10) & 0x1;
540  st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
541  st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
542  if (lfeon)
543  st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
544  st->codec->audio_service_type = bsmod;
545  if (st->codec->channels > 1 && bsmod == 0x7)
546  st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
547 
548  return 0;
549 }
550 
551 static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
552 {
553  AVStream *st;
554  int eac3info, acmod, lfeon, bsmod;
555 
556  if (c->fc->nb_streams < 1)
557  return 0;
558  st = c->fc->streams[c->fc->nb_streams-1];
559 
560  /* No need to parse fields for additional independent substreams and its
561  * associated dependent substreams since libavcodec's E-AC-3 decoder
562  * does not support them yet. */
563  avio_rb16(pb); /* data_rate and num_ind_sub */
564  eac3info = avio_rb24(pb);
565  bsmod = (eac3info >> 12) & 0x1f;
566  acmod = (eac3info >> 9) & 0x7;
567  lfeon = (eac3info >> 8) & 0x1;
568  st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];
569  if (lfeon)
570  st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;
571  st->codec->channels = av_get_channel_layout_nb_channels(st->codec->channel_layout);
572  st->codec->audio_service_type = bsmod;
573  if (st->codec->channels > 1 && bsmod == 0x7)
574  st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
575 
576  return 0;
577 }
578 
579 static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
580 {
581  AVStream *st;
582 
583  if (c->fc->nb_streams < 1)
584  return 0;
585  st = c->fc->streams[c->fc->nb_streams-1];
586 
587  if (atom.size < 16)
588  return 0;
589 
590  ff_mov_read_chan(c->fc, pb, st, atom.size - 4);
591 
592  return 0;
593 }
594 
595 static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
596 {
597  AVStream *st;
598 
599  if (c->fc->nb_streams < 1)
600  return 0;
601  st = c->fc->streams[c->fc->nb_streams-1];
602 
603  ff_get_wav_header(pb, st->codec, atom.size);
604 
605  return 0;
606 }
607 
608 static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
609 {
610  const int num = avio_rb32(pb);
611  const int den = avio_rb32(pb);
612  AVStream *st;
613 
614  if (c->fc->nb_streams < 1)
615  return 0;
616  st = c->fc->streams[c->fc->nb_streams-1];
617 
618  if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default
619  (den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num)) {
620  av_log(c->fc, AV_LOG_WARNING,
621  "sample aspect ratio already set to %d:%d, ignoring 'pasp' atom (%d:%d)\n",
622  st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
623  num, den);
624  } else if (den != 0) {
625  st->sample_aspect_ratio.num = num;
626  st->sample_aspect_ratio.den = den;
627  }
628  return 0;
629 }
630 
631 /* this atom contains actual media data */
632 static int mov_read_mdat(MOVContext *c, AVIOContext *pb, MOVAtom atom)
633 {
634  if (atom.size == 0) /* wrong one (MP4) */
635  return 0;
636  c->found_mdat=1;
637  return 0; /* now go for moov */
638 }
639 
640 /* read major brand, minor version and compatible brands and store them as metadata */
641 static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
642 {
643  uint32_t minor_ver;
644  int comp_brand_size;
645  char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */
646  char* comp_brands_str;
647  uint8_t type[5] = {0};
648 
649  avio_read(pb, type, 4);
650  if (strcmp(type, "qt "))
651  c->isom = 1;
652  av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
653  av_dict_set(&c->fc->metadata, "major_brand", type, 0);
654  minor_ver = avio_rb32(pb); /* minor version */
655  snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);
656  av_dict_set(&c->fc->metadata, "minor_version", minor_ver_str, 0);
657 
658  comp_brand_size = atom.size - 8;
659  if (comp_brand_size < 0)
660  return AVERROR_INVALIDDATA;
661  comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
662  if (!comp_brands_str)
663  return AVERROR(ENOMEM);
664  avio_read(pb, comp_brands_str, comp_brand_size);
665  comp_brands_str[comp_brand_size] = 0;
666  av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);
667  av_freep(&comp_brands_str);
668 
669  return 0;
670 }
671 
672 /* this atom should contain all header atoms */
673 static int mov_read_moov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
674 {
675  int ret;
676 
677  if ((ret = mov_read_default(c, pb, atom)) < 0)
678  return ret;
679  /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
680  /* so we don't parse the whole file if over a network */
681  c->found_moov=1;
682  return 0; /* now go for mdat */
683 }
684 
685 static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
686 {
687  c->fragment.moof_offset = avio_tell(pb) - 8;
688  av_dlog(c->fc, "moof offset %"PRIx64"\n", c->fragment.moof_offset);
689  return mov_read_default(c, pb, atom);
690 }
691 
692 static void mov_metadata_creation_time(AVDictionary **metadata, time_t time)
693 {
694  char buffer[32];
695  if (time) {
696  struct tm *ptm;
697  time -= 2082844800; /* seconds between 1904-01-01 and Epoch */
698  ptm = gmtime(&time);
699  if (!ptm) return;
700  strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
701  av_dict_set(metadata, "creation_time", buffer, 0);
702  }
703 }
704 
705 static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
706 {
707  AVStream *st;
708  MOVStreamContext *sc;
709  int version;
710  char language[4] = {0};
711  unsigned lang;
712  time_t creation_time;
713 
714  if (c->fc->nb_streams < 1)
715  return 0;
716  st = c->fc->streams[c->fc->nb_streams-1];
717  sc = st->priv_data;
718 
719  version = avio_r8(pb);
720  if (version > 1) {
721  av_log_ask_for_sample(c->fc, "unsupported version %d\n", version);
722  return AVERROR_PATCHWELCOME;
723  }
724  avio_rb24(pb); /* flags */
725  if (version == 1) {
726  creation_time = avio_rb64(pb);
727  avio_rb64(pb);
728  } else {
729  creation_time = avio_rb32(pb);
730  avio_rb32(pb); /* modification time */
731  }
732  mov_metadata_creation_time(&st->metadata, creation_time);
733 
734  sc->time_scale = avio_rb32(pb);
735  st->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
736 
737  lang = avio_rb16(pb); /* language */
738  if (ff_mov_lang_to_iso639(lang, language))
739  av_dict_set(&st->metadata, "language", language, 0);
740  avio_rb16(pb); /* quality */
741 
742  return 0;
743 }
744 
745 static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
746 {
747  time_t creation_time;
748  int version = avio_r8(pb); /* version */
749  avio_rb24(pb); /* flags */
750 
751  if (version == 1) {
752  creation_time = avio_rb64(pb);
753  avio_rb64(pb);
754  } else {
755  creation_time = avio_rb32(pb);
756  avio_rb32(pb); /* modification time */
757  }
758  mov_metadata_creation_time(&c->fc->metadata, creation_time);
759  c->time_scale = avio_rb32(pb); /* time scale */
760 
761  av_dlog(c->fc, "time scale = %i\n", c->time_scale);
762 
763  c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
764  avio_rb32(pb); /* preferred scale */
765 
766  avio_rb16(pb); /* preferred volume */
767 
768  avio_skip(pb, 10); /* reserved */
769 
770  avio_skip(pb, 36); /* display matrix */
771 
772  avio_rb32(pb); /* preview time */
773  avio_rb32(pb); /* preview duration */
774  avio_rb32(pb); /* poster time */
775  avio_rb32(pb); /* selection time */
776  avio_rb32(pb); /* selection duration */
777  avio_rb32(pb); /* current time */
778  avio_rb32(pb); /* next track ID */
779 
780  return 0;
781 }
782 
783 static int mov_read_smi(MOVContext *c, AVIOContext *pb, MOVAtom atom)
784 {
785  AVStream *st;
786 
787  if (c->fc->nb_streams < 1)
788  return 0;
789  st = c->fc->streams[c->fc->nb_streams-1];
790 
791  if ((uint64_t)atom.size > (1<<30))
792  return AVERROR_INVALIDDATA;
793 
794  // currently SVQ3 decoder expect full STSD header - so let's fake it
795  // this should be fixed and just SMI header should be passed
796  av_free(st->codec->extradata);
797  st->codec->extradata = av_mallocz(atom.size + 0x5a + FF_INPUT_BUFFER_PADDING_SIZE);
798  if (!st->codec->extradata)
799  return AVERROR(ENOMEM);
800  st->codec->extradata_size = 0x5a + atom.size;
801  memcpy(st->codec->extradata, "SVQ3", 4); // fake
802  avio_read(pb, st->codec->extradata + 0x5a, atom.size);
803  av_dlog(c->fc, "Reading SMI %"PRId64" %s\n", atom.size, st->codec->extradata + 0x5a);
804  return 0;
805 }
806 
807 static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
808 {
809  AVStream *st;
810  int little_endian;
811 
812  if (c->fc->nb_streams < 1)
813  return 0;
814  st = c->fc->streams[c->fc->nb_streams-1];
815 
816  little_endian = avio_rb16(pb);
817  av_dlog(c->fc, "enda %d\n", little_endian);
818  if (little_endian == 1) {
819  switch (st->codec->codec_id) {
820  case AV_CODEC_ID_PCM_S24BE:
821  st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
822  break;
823  case AV_CODEC_ID_PCM_S32BE:
824  st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
825  break;
826  case AV_CODEC_ID_PCM_F32BE:
827  st->codec->codec_id = AV_CODEC_ID_PCM_F32LE;
828  break;
829  case AV_CODEC_ID_PCM_F64BE:
830  st->codec->codec_id = AV_CODEC_ID_PCM_F64LE;
831  break;
832  default:
833  break;
834  }
835  }
836  return 0;
837 }
838 
839 static int mov_read_fiel(MOVContext *c, AVIOContext *pb, MOVAtom atom)
840 {
841  AVStream *st;
842  unsigned mov_field_order;
843  enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;
844 
845  if (c->fc->nb_streams < 1) // will happen with jp2 files
846  return 0;
847  st = c->fc->streams[c->fc->nb_streams-1];
848  if (atom.size < 2)
849  return AVERROR_INVALIDDATA;
850  mov_field_order = avio_rb16(pb);
851  if ((mov_field_order & 0xFF00) == 0x0100)
852  decoded_field_order = AV_FIELD_PROGRESSIVE;
853  else if ((mov_field_order & 0xFF00) == 0x0200) {
854  switch (mov_field_order & 0xFF) {
855  case 0x01: decoded_field_order = AV_FIELD_TT;
856  break;
857  case 0x06: decoded_field_order = AV_FIELD_BB;
858  break;
859  case 0x09: decoded_field_order = AV_FIELD_TB;
860  break;
861  case 0x0E: decoded_field_order = AV_FIELD_BT;
862  break;
863  }
864  }
865  if (decoded_field_order == AV_FIELD_UNKNOWN && mov_field_order) {
866  av_log(NULL, AV_LOG_ERROR, "Unknown MOV field order 0x%04x\n", mov_field_order);
867  }
868  st->codec->field_order = decoded_field_order;
869 
870  return 0;
871 }
872 
873 /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
874 static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom)
875 {
876  AVStream *st;
877  uint64_t size;
878  uint8_t *buf;
879 
880  if (c->fc->nb_streams < 1) // will happen with jp2 files
881  return 0;
882  st= c->fc->streams[c->fc->nb_streams-1];
883  size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
884  if (size > INT_MAX || (uint64_t)atom.size > INT_MAX)
885  return AVERROR_INVALIDDATA;
886  buf= av_realloc(st->codec->extradata, size);
887  if (!buf)
888  return AVERROR(ENOMEM);
889  st->codec->extradata= buf;
890  buf+= st->codec->extradata_size;
891  st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
892  AV_WB32( buf , atom.size + 8);
893  AV_WL32( buf + 4, atom.type);
894  avio_read(pb, buf + 8, atom.size);
895  return 0;
896 }
897 
898 static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)
899 {
900  AVStream *st;
901 
902  if (c->fc->nb_streams < 1)
903  return 0;
904  st = c->fc->streams[c->fc->nb_streams-1];
905 
906  if ((uint64_t)atom.size > (1<<30))
907  return AVERROR_INVALIDDATA;
908 
909  if (st->codec->codec_id == AV_CODEC_ID_QDM2 || st->codec->codec_id == AV_CODEC_ID_QDMC) {
910  // pass all frma atom to codec, needed at least for QDMC and QDM2
911  av_free(st->codec->extradata);
912  st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
913  if (!st->codec->extradata)
914  return AVERROR(ENOMEM);
915  st->codec->extradata_size = atom.size;
916  avio_read(pb, st->codec->extradata, atom.size);
917  } else if (atom.size > 8) { /* to read frma, esds atoms */
918  int ret;
919  if ((ret = mov_read_default(c, pb, atom)) < 0)
920  return ret;
921  } else
922  avio_skip(pb, atom.size);
923  return 0;
924 }
925 
930 static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
931 {
932  AVStream *st;
933 
934  if (c->fc->nb_streams < 1)
935  return 0;
936  st = c->fc->streams[c->fc->nb_streams-1];
937 
938  if ((uint64_t)atom.size > (1<<30))
939  return AVERROR_INVALIDDATA;
940 
941  if (atom.size >= 10) {
942  // Broken files created by legacy versions of libavformat will
943  // wrap a whole fiel atom inside of a glbl atom.
944  unsigned size = avio_rb32(pb);
945  unsigned type = avio_rl32(pb);
946  avio_seek(pb, -8, SEEK_CUR);
947  if (type == MKTAG('f','i','e','l') && size == atom.size)
948  return mov_read_default(c, pb, atom);
949  }
950  av_free(st->codec->extradata);
951  st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
952  if (!st->codec->extradata)
953  return AVERROR(ENOMEM);
954  st->codec->extradata_size = atom.size;
955  avio_read(pb, st->codec->extradata, atom.size);
956  return 0;
957 }
958 
959 static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)
960 {
961  AVStream *st;
962  uint8_t profile_level;
963 
964  if (c->fc->nb_streams < 1)
965  return 0;
966  st = c->fc->streams[c->fc->nb_streams-1];
967 
968  if (atom.size >= (1<<28) || atom.size < 7)
969  return AVERROR_INVALIDDATA;
970 
971  profile_level = avio_r8(pb);
972  if ((profile_level & 0xf0) != 0xc0)
973  return 0;
974 
975  av_free(st->codec->extradata);
976  st->codec->extradata = av_mallocz(atom.size - 7 + FF_INPUT_BUFFER_PADDING_SIZE);
977  if (!st->codec->extradata)
978  return AVERROR(ENOMEM);
979  st->codec->extradata_size = atom.size - 7;
980  avio_seek(pb, 6, SEEK_CUR);
981  avio_read(pb, st->codec->extradata, st->codec->extradata_size);
982  return 0;
983 }
984 
990 static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)
991 {
992  AVStream *st;
993 
994  if (c->fc->nb_streams < 1)
995  return 0;
996  if (atom.size <= 40)
997  return 0;
998  st = c->fc->streams[c->fc->nb_streams-1];
999 
1000  if ((uint64_t)atom.size > (1<<30))
1001  return AVERROR_INVALIDDATA;
1002 
1003  av_free(st->codec->extradata);
1004  st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);
1005  if (!st->codec->extradata)
1006  return AVERROR(ENOMEM);
1007  st->codec->extradata_size = atom.size - 40;
1008  avio_skip(pb, 40);
1009  avio_read(pb, st->codec->extradata, atom.size - 40);
1010  return 0;
1011 }
1012 
1013 static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1014 {
1015  AVStream *st;
1016  MOVStreamContext *sc;
1017  unsigned int i, entries;
1018 
1019  if (c->fc->nb_streams < 1)
1020  return 0;
1021  st = c->fc->streams[c->fc->nb_streams-1];
1022  sc = st->priv_data;
1023 
1024  avio_r8(pb); /* version */
1025  avio_rb24(pb); /* flags */
1026 
1027  entries = avio_rb32(pb);
1028 
1029  if (!entries)
1030  return 0;
1031  if (entries >= UINT_MAX/sizeof(int64_t))
1032  return AVERROR_INVALIDDATA;
1033 
1034  sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
1035  if (!sc->chunk_offsets)
1036  return AVERROR(ENOMEM);
1037  sc->chunk_count = entries;
1038 
1039  if (atom.type == MKTAG('s','t','c','o'))
1040  for (i = 0; i < entries && !pb->eof_reached; i++)
1041  sc->chunk_offsets[i] = avio_rb32(pb);
1042  else if (atom.type == MKTAG('c','o','6','4'))
1043  for (i = 0; i < entries && !pb->eof_reached; i++)
1044  sc->chunk_offsets[i] = avio_rb64(pb);
1045  else
1046  return AVERROR_INVALIDDATA;
1047 
1048  sc->chunk_count = i;
1049 
1050  if (pb->eof_reached)
1051  return AVERROR_EOF;
1052 
1053  return 0;
1054 }
1055 
1060 enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
1061 {
1062  /* lpcm flags:
1063  * 0x1 = float
1064  * 0x2 = big-endian
1065  * 0x4 = signed
1066  */
1067  return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);
1068 }
1069 
1070 int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
1071 {
1072  AVStream *st;
1073  MOVStreamContext *sc;
1074  int j, pseudo_stream_id;
1075 
1076  if (c->fc->nb_streams < 1)
1077  return 0;
1078  st = c->fc->streams[c->fc->nb_streams-1];
1079  sc = st->priv_data;
1080 
1081  for (pseudo_stream_id = 0;
1082  pseudo_stream_id < entries && !pb->eof_reached;
1083  pseudo_stream_id++) {
1084  //Parsing Sample description table
1085  enum AVCodecID id;
1086  int dref_id = 1;
1087  MOVAtom a = { AV_RL32("stsd") };
1088  int64_t start_pos = avio_tell(pb);
1089  uint32_t size = avio_rb32(pb); /* size */
1090  uint32_t format = avio_rl32(pb); /* data format */
1091 
1092  if (size >= 16) {
1093  avio_rb32(pb); /* reserved */
1094  avio_rb16(pb); /* reserved */
1095  dref_id = avio_rb16(pb);
1096  } else {
1097  av_log(c->fc, AV_LOG_ERROR, "invalid size %d in stsd\n", size);
1098  return AVERROR_INVALIDDATA;
1099  }
1100 
1101  if (st->codec->codec_tag &&
1102  st->codec->codec_tag != format &&
1103  (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags, format) != c->fc->video_codec_id
1104  : st->codec->codec_tag != MKTAG('j','p','e','g'))
1105  ){
1106  /* Multiple fourcc, we skip JPEG. This is not correct, we should
1107  * export it as a separate AVStream but this needs a few changes
1108  * in the MOV demuxer, patch welcome. */
1109  multiple_stsd:
1110  av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
1111  avio_skip(pb, size - (avio_tell(pb) - start_pos));
1112  continue;
1113  }
1114  /* we cannot demux concatenated h264 streams because of different extradata */
1115  if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))
1116  goto multiple_stsd;
1117  sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
1118  sc->dref_id= dref_id;
1119 
1120  st->codec->codec_tag = format;
1121  id = ff_codec_get_id(ff_codec_movaudio_tags, format);
1122  if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))
1123  id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);
1124 
1125  if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {
1126  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1127  } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */
1128  format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
1129  id = ff_codec_get_id(ff_codec_movvideo_tags, format);
1130  if (id <= 0)
1131  id = ff_codec_get_id(ff_codec_bmp_tags, format);
1132  if (id > 0)
1133  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1134  else if (st->codec->codec_type == AVMEDIA_TYPE_DATA){
1135  id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
1136  if (id > 0)
1137  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1138  }
1139  }
1140 
1141  av_dlog(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,
1142  (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
1143  (format >> 24) & 0xff, st->codec->codec_type);
1144 
1145  if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
1146  unsigned int color_depth, len;
1147  int color_greyscale;
1148  int color_table_id;
1149 
1150  st->codec->codec_id = id;
1151  avio_rb16(pb); /* version */
1152  avio_rb16(pb); /* revision level */
1153  avio_rb32(pb); /* vendor */
1154  avio_rb32(pb); /* temporal quality */
1155  avio_rb32(pb); /* spatial quality */
1156 
1157  st->codec->width = avio_rb16(pb); /* width */
1158  st->codec->height = avio_rb16(pb); /* height */
1159 
1160  avio_rb32(pb); /* horiz resolution */
1161  avio_rb32(pb); /* vert resolution */
1162  avio_rb32(pb); /* data size, always 0 */
1163  avio_rb16(pb); /* frames per samples */
1164 
1165  len = avio_r8(pb); /* codec name, pascal string */
1166  if (len > 31)
1167  len = 31;
1168  mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);
1169  if (len < 31)
1170  avio_skip(pb, 31 - len);
1171  /* codec_tag YV12 triggers an UV swap in rawdec.c */
1172  if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))
1173  st->codec->codec_tag=MKTAG('I', '4', '2', '0');
1174  /* Flash Media Server uses tag H263 with Sorenson Spark */
1175  if (format == MKTAG('H','2','6','3') &&
1176  !memcmp(st->codec->codec_name, "Sorenson H263", 13))
1177  st->codec->codec_id = AV_CODEC_ID_FLV1;
1178 
1179  st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */
1180  color_table_id = avio_rb16(pb); /* colortable id */
1181  av_dlog(c->fc, "depth %d, ctab id %d\n",
1182  st->codec->bits_per_coded_sample, color_table_id);
1183  /* figure out the palette situation */
1184  color_depth = st->codec->bits_per_coded_sample & 0x1F;
1185  color_greyscale = st->codec->bits_per_coded_sample & 0x20;
1186 
1187  /* if the depth is 2, 4, or 8 bpp, file is palettized */
1188  if ((color_depth == 2) || (color_depth == 4) ||
1189  (color_depth == 8)) {
1190  /* for palette traversal */
1191  unsigned int color_start, color_count, color_end;
1192  unsigned char r, g, b;
1193 
1194  if (color_greyscale) {
1195  int color_index, color_dec;
1196  /* compute the greyscale palette */
1197  st->codec->bits_per_coded_sample = color_depth;
1198  color_count = 1 << color_depth;
1199  color_index = 255;
1200  color_dec = 256 / (color_count - 1);
1201  for (j = 0; j < color_count; j++) {
1202  r = g = b = color_index;
1203  sc->palette[j] =
1204  (r << 16) | (g << 8) | (b);
1205  color_index -= color_dec;
1206  if (color_index < 0)
1207  color_index = 0;
1208  }
1209  } else if (color_table_id) {
1210  const uint8_t *color_table;
1211  /* if flag bit 3 is set, use the default palette */
1212  color_count = 1 << color_depth;
1213  if (color_depth == 2)
1214  color_table = ff_qt_default_palette_4;
1215  else if (color_depth == 4)
1216  color_table = ff_qt_default_palette_16;
1217  else
1218  color_table = ff_qt_default_palette_256;
1219 
1220  for (j = 0; j < color_count; j++) {
1221  r = color_table[j * 3 + 0];
1222  g = color_table[j * 3 + 1];
1223  b = color_table[j * 3 + 2];
1224  sc->palette[j] =
1225  (r << 16) | (g << 8) | (b);
1226  }
1227  } else {
1228  /* load the palette from the file */
1229  color_start = avio_rb32(pb);
1230  color_count = avio_rb16(pb);
1231  color_end = avio_rb16(pb);
1232  if ((color_start <= 255) &&
1233  (color_end <= 255)) {
1234  for (j = color_start; j <= color_end; j++) {
1235  /* each R, G, or B component is 16 bits;
1236  * only use the top 8 bits; skip alpha bytes
1237  * up front */
1238  avio_r8(pb);
1239  avio_r8(pb);
1240  r = avio_r8(pb);
1241  avio_r8(pb);
1242  g = avio_r8(pb);
1243  avio_r8(pb);
1244  b = avio_r8(pb);
1245  avio_r8(pb);
1246  sc->palette[j] =
1247  (r << 16) | (g << 8) | (b);
1248  }
1249  }
1250  }
1251  sc->has_palette = 1;
1252  }
1253  } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
1254  int bits_per_sample, flags;
1255  uint16_t version = avio_rb16(pb);
1256 
1257  st->codec->codec_id = id;
1258  avio_rb16(pb); /* revision level */
1259  avio_rb32(pb); /* vendor */
1260 
1261  st->codec->channels = avio_rb16(pb); /* channel count */
1262  av_dlog(c->fc, "audio channels %d\n", st->codec->channels);
1263  st->codec->bits_per_coded_sample = avio_rb16(pb); /* sample size */
1264 
1265  sc->audio_cid = avio_rb16(pb);
1266  avio_rb16(pb); /* packet size = 0 */
1267 
1268  st->codec->sample_rate = ((avio_rb32(pb) >> 16));
1269 
1270  //Read QT version 1 fields. In version 0 these do not exist.
1271  av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);
1272  if (!c->isom) {
1273  if (version==1) {
1274  sc->samples_per_frame = avio_rb32(pb);
1275  avio_rb32(pb); /* bytes per packet */
1276  sc->bytes_per_frame = avio_rb32(pb);
1277  avio_rb32(pb); /* bytes per sample */
1278  } else if (version==2) {
1279  avio_rb32(pb); /* sizeof struct only */
1280  st->codec->sample_rate = av_int2double(avio_rb64(pb)); /* float 64 */
1281  st->codec->channels = avio_rb32(pb);
1282  avio_rb32(pb); /* always 0x7F000000 */
1283  st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */
1284  flags = avio_rb32(pb); /* lpcm format specific flag */
1285  sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */
1286  sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */
1287  if (format == MKTAG('l','p','c','m'))
1288  st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);
1289  }
1290  }
1291 
1292  switch (st->codec->codec_id) {
1293  case AV_CODEC_ID_PCM_S8:
1294  case AV_CODEC_ID_PCM_U8:
1295  if (st->codec->bits_per_coded_sample == 16)
1296  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
1297  break;
1298  case AV_CODEC_ID_PCM_S16LE:
1299  case AV_CODEC_ID_PCM_S16BE:
1300  if (st->codec->bits_per_coded_sample == 8)
1301  st->codec->codec_id = AV_CODEC_ID_PCM_S8;
1302  else if (st->codec->bits_per_coded_sample == 24)
1303  st->codec->codec_id =
1304  st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?
1305  AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
1306  break;
1307  /* set values for old format before stsd version 1 appeared */
1308  case AV_CODEC_ID_MACE3:
1309  sc->samples_per_frame = 6;
1310  sc->bytes_per_frame = 2*st->codec->channels;
1311  break;
1312  case AV_CODEC_ID_MACE6:
1313  sc->samples_per_frame = 6;
1314  sc->bytes_per_frame = 1*st->codec->channels;
1315  break;
1316  case AV_CODEC_ID_ADPCM_IMA_QT:
1317  sc->samples_per_frame = 64;
1318  sc->bytes_per_frame = 34*st->codec->channels;
1319  break;
1320  case AV_CODEC_ID_GSM:
1321  sc->samples_per_frame = 160;
1322  sc->bytes_per_frame = 33;
1323  break;
1324  default:
1325  break;
1326  }
1327 
1328  bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
1329  if (bits_per_sample) {
1330  st->codec->bits_per_coded_sample = bits_per_sample;
1331  sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
1332  }
1333  } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){
1334  // ttxt stsd contains display flags, justification, background
1335  // color, fonts, and default styles, so fake an atom to read it
1336  MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };
1337  if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom
1338  mov_read_glbl(c, pb, fake_atom);
1339  st->codec->codec_id= id;
1340  st->codec->width = sc->width;
1341  st->codec->height = sc->height;
1342  } else {
1343  /* other codec type, just skip (rtp, mp4s, tmcd ...) */
1344  avio_skip(pb, size - (avio_tell(pb) - start_pos));
1345  }
1346  /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
1347  a.size = size - (avio_tell(pb) - start_pos);
1348  if (a.size > 8) {
1349  int ret;
1350  if ((ret = mov_read_default(c, pb, a)) < 0)
1351  return ret;
1352  } else if (a.size > 0)
1353  avio_skip(pb, a.size);
1354  }
1355 
1356  if (pb->eof_reached)
1357  return AVERROR_EOF;
1358 
1359  if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)
1360  st->codec->sample_rate= sc->time_scale;
1361 
1362  /* special codec parameters handling */
1363  switch (st->codec->codec_id) {
1364 #if CONFIG_DV_DEMUXER
1365  case AV_CODEC_ID_DVAUDIO:
1366  c->dv_fctx = avformat_alloc_context();
1367  c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);
1368  if (!c->dv_demux) {
1369  av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
1370  return AVERROR(ENOMEM);
1371  }
1372  sc->dv_audio_container = 1;
1373  st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
1374  break;
1375 #endif
1376  /* no ifdef since parameters are always those */
1377  case AV_CODEC_ID_QCELP:
1378  // force sample rate for qcelp when not stored in mov
1379  if (st->codec->codec_tag != MKTAG('Q','c','l','p'))
1380  st->codec->sample_rate = 8000;
1381  st->codec->channels= 1; /* really needed */
1382  break;
1383  case AV_CODEC_ID_AMR_NB:
1384  st->codec->channels= 1; /* really needed */
1385  /* force sample rate for amr, stsd in 3gp does not store sample rate */
1386  st->codec->sample_rate = 8000;
1387  break;
1388  case AV_CODEC_ID_AMR_WB:
1389  st->codec->channels = 1;
1390  st->codec->sample_rate = 16000;
1391  break;
1392  case AV_CODEC_ID_MP2:
1393  case AV_CODEC_ID_MP3:
1394  st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
1395  st->need_parsing = AVSTREAM_PARSE_FULL;
1396  break;
1397  case AV_CODEC_ID_GSM:
1398  case AV_CODEC_ID_ADPCM_MS:
1399  case AV_CODEC_ID_ADPCM_IMA_WAV:
1400  case AV_CODEC_ID_ILBC:
1401  st->codec->block_align = sc->bytes_per_frame;
1402  break;
1403  case AV_CODEC_ID_ALAC:
1404  if (st->codec->extradata_size == 36) {
1405  st->codec->channels = AV_RB8 (st->codec->extradata+21);
1406  st->codec->sample_rate = AV_RB32(st->codec->extradata+32);
1407  }
1408  break;
1409  case AV_CODEC_ID_VC1:
1410  st->need_parsing = AVSTREAM_PARSE_FULL;
1411  break;
1412  default:
1413  break;
1414  }
1415 
1416  return 0;
1417 }
1418 
1419 static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1420 {
1421  int entries;
1422 
1423  avio_r8(pb); /* version */
1424  avio_rb24(pb); /* flags */
1425  entries = avio_rb32(pb);
1426 
1427  return ff_mov_read_stsd_entries(c, pb, entries);
1428 }
1429 
1430 static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1431 {
1432  AVStream *st;
1433  MOVStreamContext *sc;
1434  unsigned int i, entries;
1435 
1436  if (c->fc->nb_streams < 1)
1437  return 0;
1438  st = c->fc->streams[c->fc->nb_streams-1];
1439  sc = st->priv_data;
1440 
1441  avio_r8(pb); /* version */
1442  avio_rb24(pb); /* flags */
1443 
1444  entries = avio_rb32(pb);
1445 
1446  av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
1447 
1448  if (!entries)
1449  return 0;
1450  if (entries >= UINT_MAX / sizeof(*sc->stsc_data))
1451  return AVERROR_INVALIDDATA;
1452  sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
1453  if (!sc->stsc_data)
1454  return AVERROR(ENOMEM);
1455 
1456  for (i = 0; i < entries && !pb->eof_reached; i++) {
1457  sc->stsc_data[i].first = avio_rb32(pb);
1458  sc->stsc_data[i].count = avio_rb32(pb);
1459  sc->stsc_data[i].id = avio_rb32(pb);
1460  }
1461 
1462  sc->stsc_count = i;
1463 
1464  if (pb->eof_reached)
1465  return AVERROR_EOF;
1466 
1467  return 0;
1468 }
1469 
1470 static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1471 {
1472  AVStream *st;
1473  MOVStreamContext *sc;
1474  unsigned i, entries;
1475 
1476  if (c->fc->nb_streams < 1)
1477  return 0;
1478  st = c->fc->streams[c->fc->nb_streams-1];
1479  sc = st->priv_data;
1480 
1481  avio_rb32(pb); // version + flags
1482 
1483  entries = avio_rb32(pb);
1484  if (entries >= UINT_MAX / sizeof(*sc->stps_data))
1485  return AVERROR_INVALIDDATA;
1486  sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));
1487  if (!sc->stps_data)
1488  return AVERROR(ENOMEM);
1489 
1490  for (i = 0; i < entries && !pb->eof_reached; i++) {
1491  sc->stps_data[i] = avio_rb32(pb);
1492  //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);
1493  }
1494 
1495  sc->stps_count = i;
1496 
1497  if (pb->eof_reached)
1498  return AVERROR_EOF;
1499 
1500  return 0;
1501 }
1502 
1503 static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1504 {
1505  AVStream *st;
1506  MOVStreamContext *sc;
1507  unsigned int i, entries;
1508 
1509  if (c->fc->nb_streams < 1)
1510  return 0;
1511  st = c->fc->streams[c->fc->nb_streams-1];
1512  sc = st->priv_data;
1513 
1514  avio_r8(pb); /* version */
1515  avio_rb24(pb); /* flags */
1516 
1517  entries = avio_rb32(pb);
1518 
1519  av_dlog(c->fc, "keyframe_count = %d\n", entries);
1520 
1521  if (!entries)
1522  {
1523  sc->keyframe_absent = 1;
1524  return 0;
1525  }
1526  if (entries >= UINT_MAX / sizeof(int))
1527  return AVERROR_INVALIDDATA;
1528  sc->keyframes = av_malloc(entries * sizeof(int));
1529  if (!sc->keyframes)
1530  return AVERROR(ENOMEM);
1531 
1532  for (i = 0; i < entries && !pb->eof_reached; i++) {
1533  sc->keyframes[i] = avio_rb32(pb);
1534  //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
1535  }
1536 
1537  sc->keyframe_count = i;
1538 
1539  if (pb->eof_reached)
1540  return AVERROR_EOF;
1541 
1542  return 0;
1543 }
1544 
1545 static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1546 {
1547  AVStream *st;
1548  MOVStreamContext *sc;
1549  unsigned int i, entries, sample_size, field_size, num_bytes;
1550  GetBitContext gb;
1551  unsigned char* buf;
1552 
1553  if (c->fc->nb_streams < 1)
1554  return 0;
1555  st = c->fc->streams[c->fc->nb_streams-1];
1556  sc = st->priv_data;
1557 
1558  avio_r8(pb); /* version */
1559  avio_rb24(pb); /* flags */
1560 
1561  if (atom.type == MKTAG('s','t','s','z')) {
1562  sample_size = avio_rb32(pb);
1563  if (!sc->sample_size) /* do not overwrite value computed in stsd */
1564  sc->sample_size = sample_size;
1565  field_size = 32;
1566  } else {
1567  sample_size = 0;
1568  avio_rb24(pb); /* reserved */
1569  field_size = avio_r8(pb);
1570  }
1571  entries = avio_rb32(pb);
1572 
1573  av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);
1574 
1575  sc->sample_count = entries;
1576  if (sample_size)
1577  return 0;
1578 
1579  if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
1580  av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);
1581  return AVERROR_INVALIDDATA;
1582  }
1583 
1584  if (!entries)
1585  return 0;
1586  if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
1587  return AVERROR_INVALIDDATA;
1588  sc->sample_sizes = av_malloc(entries * sizeof(int));
1589  if (!sc->sample_sizes)
1590  return AVERROR(ENOMEM);
1591 
1592  num_bytes = (entries*field_size+4)>>3;
1593 
1594  buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
1595  if (!buf) {
1596  av_freep(&sc->sample_sizes);
1597  return AVERROR(ENOMEM);
1598  }
1599 
1600  if (avio_read(pb, buf, num_bytes) < num_bytes) {
1601  av_freep(&sc->sample_sizes);
1602  av_free(buf);
1603  return AVERROR_INVALIDDATA;
1604  }
1605 
1606  init_get_bits(&gb, buf, 8*num_bytes);
1607 
1608  for (i = 0; i < entries && !pb->eof_reached; i++) {
1609  sc->sample_sizes[i] = get_bits_long(&gb, field_size);
1610  sc->data_size += sc->sample_sizes[i];
1611  }
1612 
1613  sc->sample_count = i;
1614 
1615  if (pb->eof_reached)
1616  return AVERROR_EOF;
1617 
1618  av_free(buf);
1619  return 0;
1620 }
1621 
1622 static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1623 {
1624  AVStream *st;
1625  MOVStreamContext *sc;
1626  unsigned int i, entries;
1627  int64_t duration=0;
1628  int64_t total_sample_count=0;
1629 
1630  if (c->fc->nb_streams < 1)
1631  return 0;
1632  st = c->fc->streams[c->fc->nb_streams-1];
1633  sc = st->priv_data;
1634 
1635  avio_r8(pb); /* version */
1636  avio_rb24(pb); /* flags */
1637  entries = avio_rb32(pb);
1638 
1639  av_dlog(c->fc, "track[%i].stts.entries = %i\n",
1640  c->fc->nb_streams-1, entries);
1641 
1642  if (!entries)
1643  return 0;
1644  if (entries >= UINT_MAX / sizeof(*sc->stts_data))
1645  return AVERROR(EINVAL);
1646 
1647  sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
1648  if (!sc->stts_data)
1649  return AVERROR(ENOMEM);
1650 
1651  for (i = 0; i < entries && !pb->eof_reached; i++) {
1652  int sample_duration;
1653  int sample_count;
1654 
1655  sample_count=avio_rb32(pb);
1656  sample_duration = avio_rb32(pb);
1657  sc->stts_data[i].count= sample_count;
1658  sc->stts_data[i].duration= sample_duration;
1659 
1660  av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",
1661  sample_count, sample_duration);
1662 
1663  duration+=(int64_t)sample_duration*sample_count;
1664  total_sample_count+=sample_count;
1665  }
1666 
1667  sc->stts_count = i;
1668 
1669  if (pb->eof_reached)
1670  return AVERROR_EOF;
1671 
1672  st->nb_frames= total_sample_count;
1673  if (duration)
1674  st->duration= duration;
1675  sc->track_end = duration;
1676  return 0;
1677 }
1678 
1679 static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1680 {
1681  AVStream *st;
1682  MOVStreamContext *sc;
1683  unsigned int i, entries;
1684 
1685  if (c->fc->nb_streams < 1)
1686  return 0;
1687  st = c->fc->streams[c->fc->nb_streams-1];
1688  sc = st->priv_data;
1689 
1690  avio_r8(pb); /* version */
1691  avio_rb24(pb); /* flags */
1692  entries = avio_rb32(pb);
1693 
1694  av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
1695 
1696  if (!entries)
1697  return 0;
1698  if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
1699  return AVERROR_INVALIDDATA;
1700  sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
1701  if (!sc->ctts_data)
1702  return AVERROR(ENOMEM);
1703 
1704  for (i = 0; i < entries && !pb->eof_reached; i++) {
1705  int count =avio_rb32(pb);
1706  int duration =avio_rb32(pb);
1707 
1708  sc->ctts_data[i].count = count;
1709  sc->ctts_data[i].duration= duration;
1710  if (duration < 0)
1711  sc->dts_shift = FFMAX(sc->dts_shift, -duration);
1712  }
1713 
1714  sc->ctts_count = i;
1715 
1716  if (pb->eof_reached)
1717  return AVERROR_EOF;
1718 
1719  av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);
1720 
1721  return 0;
1722 }
1723 
1724 static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
1725 {
1726  AVStream *st;
1727  MOVStreamContext *sc;
1728  unsigned int i, entries;
1729  uint8_t version;
1730  uint32_t grouping_type;
1731 
1732  if (c->fc->nb_streams < 1)
1733  return 0;
1734  st = c->fc->streams[c->fc->nb_streams-1];
1735  sc = st->priv_data;
1736 
1737  version = avio_r8(pb); /* version */
1738  avio_rb24(pb); /* flags */
1739  grouping_type = avio_rl32(pb);
1740  if (grouping_type != MKTAG( 'r','a','p',' '))
1741  return 0; /* only support 'rap ' grouping */
1742  if (version == 1)
1743  avio_rb32(pb); /* grouping_type_parameter */
1744 
1745  entries = avio_rb32(pb);
1746  if (!entries)
1747  return 0;
1748  if (entries >= UINT_MAX / sizeof(*sc->rap_group))
1749  return AVERROR_INVALIDDATA;
1750  sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));
1751  if (!sc->rap_group)
1752  return AVERROR(ENOMEM);
1753 
1754  for (i = 0; i < entries && !pb->eof_reached; i++) {
1755  sc->rap_group[i].count = avio_rb32(pb); /* sample_count */
1756  sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */
1757  }
1758 
1759  sc->rap_group_count = i;
1760 
1761  return pb->eof_reached ? AVERROR_EOF : 0;
1762 }
1763 
1764 static void mov_build_index(MOVContext *mov, AVStream *st)
1765 {
1766  MOVStreamContext *sc = st->priv_data;
1767  int64_t current_offset;
1768  int64_t current_dts = 0;
1769  unsigned int stts_index = 0;
1770  unsigned int stsc_index = 0;
1771  unsigned int stss_index = 0;
1772  unsigned int stps_index = 0;
1773  unsigned int i, j;
1774  uint64_t stream_size = 0;
1775  AVIndexEntry *mem;
1776 
1777  /* adjust first dts according to edit list */
1778  if (sc->time_offset && mov->time_scale > 0) {
1779  if (sc->time_offset < 0)
1780  sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);
1781  current_dts = -sc->time_offset;
1782  if (sc->ctts_data && sc->stts_data && sc->stts_data[0].duration &&
1783  sc->ctts_data[0].duration / sc->stts_data[0].duration > 16) {
1784  /* more than 16 frames delay, dts are likely wrong
1785  this happens with files created by iMovie */
1786  sc->wrong_dts = 1;
1787  st->codec->has_b_frames = 1;
1788  }
1789  }
1790 
1791  /* only use old uncompressed audio chunk demuxing when stts specifies it */
1792  if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
1793  sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
1794  unsigned int current_sample = 0;
1795  unsigned int stts_sample = 0;
1796  unsigned int sample_size;
1797  unsigned int distance = 0;
1798  unsigned int rap_group_index = 0;
1799  unsigned int rap_group_sample = 0;
1800  int rap_group_present = sc->rap_group_count && sc->rap_group;
1801  int key_off = (sc->keyframes && sc->keyframes[0] > 0) || (sc->stps_data && sc->stps_data[0] > 0);
1802 
1803  current_dts -= sc->dts_shift;
1804 
1805  if (!sc->sample_count)
1806  return;
1807  if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
1808  return;
1809  mem = av_realloc(st->index_entries, (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries));
1810  if (!mem)
1811  return;
1812  st->index_entries = mem;
1813  st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);
1814 
1815  for (i = 0; i < sc->chunk_count; i++) {
1816  current_offset = sc->chunk_offsets[i];
1817  while (stsc_index + 1 < sc->stsc_count &&
1818  i + 1 == sc->stsc_data[stsc_index + 1].first)
1819  stsc_index++;
1820  for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
1821  int keyframe = 0;
1822  if (current_sample >= sc->sample_count) {
1823  av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
1824  return;
1825  }
1826 
1827  if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {
1828  keyframe = 1;
1829  if (stss_index + 1 < sc->keyframe_count)
1830  stss_index++;
1831  } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
1832  keyframe = 1;
1833  if (stps_index + 1 < sc->stps_count)
1834  stps_index++;
1835  }
1836  if (rap_group_present && rap_group_index < sc->rap_group_count) {
1837  if (sc->rap_group[rap_group_index].index > 0)
1838  keyframe = 1;
1839  if (++rap_group_sample == sc->rap_group[rap_group_index].count) {
1840  rap_group_sample = 0;
1841  rap_group_index++;
1842  }
1843  }
1844  if (keyframe)
1845  distance = 0;
1846  sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];
1847  if (sc->pseudo_stream_id == -1 ||
1848  sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
1849  AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];
1850  e->pos = current_offset;
1851  e->timestamp = current_dts;
1852  e->size = sample_size;
1853  e->min_distance = distance;
1854  e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
1855  av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
1856  "size %d, distance %d, keyframe %d\n", st->index, current_sample,
1857  current_offset, current_dts, sample_size, distance, keyframe);
1858  }
1859 
1860  current_offset += sample_size;
1861  stream_size += sample_size;
1862  current_dts += sc->stts_data[stts_index].duration;
1863  distance++;
1864  stts_sample++;
1865  current_sample++;
1866  if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
1867  stts_sample = 0;
1868  stts_index++;
1869  }
1870  }
1871  }
1872  if (st->duration > 0)
1873  st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;
1874  } else {
1875  unsigned chunk_samples, total = 0;
1876 
1877  // compute total chunk count
1878  for (i = 0; i < sc->stsc_count; i++) {
1879  unsigned count, chunk_count;
1880 
1881  chunk_samples = sc->stsc_data[i].count;
1882  if (i != sc->stsc_count - 1 &&
1883  sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
1884  av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
1885  return;
1886  }
1887 
1888  if (sc->samples_per_frame >= 160) { // gsm
1889  count = chunk_samples / sc->samples_per_frame;
1890  } else if (sc->samples_per_frame > 1) {
1891  unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
1892  count = (chunk_samples+samples-1) / samples;
1893  } else {
1894  count = (chunk_samples+1023) / 1024;
1895  }
1896 
1897  if (i < sc->stsc_count - 1)
1898  chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
1899  else
1900  chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
1901  total += chunk_count * count;
1902  }
1903 
1904  av_dlog(mov->fc, "chunk count %d\n", total);
1905  if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)
1906  return;
1907  mem = av_realloc(st->index_entries, (st->nb_index_entries + total) * sizeof(*st->index_entries));
1908  if (!mem)
1909  return;
1910  st->index_entries = mem;
1911  st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);
1912 
1913  // populate index
1914  for (i = 0; i < sc->chunk_count; i++) {
1915  current_offset = sc->chunk_offsets[i];
1916  if (stsc_index + 1 < sc->stsc_count &&
1917  i + 1 == sc->stsc_data[stsc_index + 1].first)
1918  stsc_index++;
1919  chunk_samples = sc->stsc_data[stsc_index].count;
1920 
1921  while (chunk_samples > 0) {
1922  AVIndexEntry *e;
1923  unsigned size, samples;
1924 
1925  if (sc->samples_per_frame >= 160) { // gsm
1926  samples = sc->samples_per_frame;
1927  size = sc->bytes_per_frame;
1928  } else {
1929  if (sc->samples_per_frame > 1) {
1930  samples = FFMIN((1024 / sc->samples_per_frame)*
1931  sc->samples_per_frame, chunk_samples);
1932  size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
1933  } else {
1934  samples = FFMIN(1024, chunk_samples);
1935  size = samples * sc->sample_size;
1936  }
1937  }
1938 
1939  if (st->nb_index_entries >= total) {
1940  av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);
1941  return;
1942  }
1943  e = &st->index_entries[st->nb_index_entries++];
1944  e->pos = current_offset;
1945  e->timestamp = current_dts;
1946  e->size = size;
1947  e->min_distance = 0;
1948  e->flags = AVINDEX_KEYFRAME;
1949  av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "
1950  "size %d, duration %d\n", st->index, i, current_offset, current_dts,
1951  size, samples);
1952 
1953  current_offset += size;
1954  current_dts += samples;
1955  chunk_samples -= samples;
1956  }
1957  }
1958  }
1959 }
1960 
1961 static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,
1962  AVIOInterruptCB *int_cb)
1963 {
1964  /* try relative path, we do not try the absolute because it can leak information about our
1965  system to an attacker */
1966  if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
1967  char filename[1024];
1968  char *src_path;
1969  int i, l;
1970 
1971  /* find a source dir */
1972  src_path = strrchr(src, '/');
1973  if (src_path)
1974  src_path++;
1975  else
1976  src_path = src;
1977 
1978  /* find a next level down to target */
1979  for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)
1980  if (ref->path[l] == '/') {
1981  if (i == ref->nlvl_to - 1)
1982  break;
1983  else
1984  i++;
1985  }
1986 
1987  /* compose filename if next level down to target was found */
1988  if (i == ref->nlvl_to - 1 && src_path - src < sizeof(filename)) {
1989  memcpy(filename, src, src_path - src);
1990  filename[src_path - src] = 0;
1991 
1992  for (i = 1; i < ref->nlvl_from; i++)
1993  av_strlcat(filename, "../", 1024);
1994 
1995  av_strlcat(filename, ref->path + l + 1, 1024);
1996 
1997  if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))
1998  return 0;
1999  }
2000  }
2001 
2002  return AVERROR(ENOENT);
2003 }
2004 
2005 static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2006 {
2007  AVStream *st;
2008  MOVStreamContext *sc;
2009  int ret;
2010 
2011  st = avformat_new_stream(c->fc, NULL);
2012  if (!st) return AVERROR(ENOMEM);
2013  st->id = c->fc->nb_streams;
2014  sc = av_mallocz(sizeof(MOVStreamContext));
2015  if (!sc) return AVERROR(ENOMEM);
2016 
2017  st->priv_data = sc;
2018  st->codec->codec_type = AVMEDIA_TYPE_DATA;
2019  sc->ffindex = st->index;
2020 
2021  if ((ret = mov_read_default(c, pb, atom)) < 0)
2022  return ret;
2023 
2024  /* sanity checks */
2025  if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
2026  (!sc->sample_size && !sc->sample_count))) {
2027  av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
2028  st->index);
2029  return 0;
2030  }
2031 
2032  if (sc->time_scale <= 0) {
2033  av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);
2034  sc->time_scale = c->time_scale;
2035  if (sc->time_scale <= 0)
2036  sc->time_scale = 1;
2037  }
2038 
2039  avpriv_set_pts_info(st, 64, 1, sc->time_scale);
2040 
2041  mov_build_index(c, st);
2042 
2043  if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
2044  MOVDref *dref = &sc->drefs[sc->dref_id - 1];
2045  if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback) < 0)
2046  av_log(c->fc, AV_LOG_ERROR,
2047  "stream %d, error opening alias: path='%s', dir='%s', "
2048  "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
2049  st->index, dref->path, dref->dir, dref->filename,
2050  dref->volume, dref->nlvl_from, dref->nlvl_to);
2051  } else
2052  sc->pb = c->fc->pb;
2053 
2054  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
2055  if (!st->sample_aspect_ratio.num &&
2056  (st->codec->width != sc->width || st->codec->height != sc->height)) {
2057  st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /
2058  ((double)st->codec->width * sc->height), INT_MAX);
2059  }
2060 
2061  if (st->duration != AV_NOPTS_VALUE)
2062  av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2063  sc->time_scale*st->nb_frames, st->duration, INT_MAX);
2064 
2065 #if FF_API_R_FRAME_RATE
2066  if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))
2067  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
2068  sc->time_scale, sc->stts_data[0].duration, INT_MAX);
2069 #endif
2070  }
2071 
2072  switch (st->codec->codec_id) {
2073 #if CONFIG_H261_DECODER
2074  case AV_CODEC_ID_H261:
2075 #endif
2076 #if CONFIG_H263_DECODER
2077  case AV_CODEC_ID_H263:
2078 #endif
2079 #if CONFIG_MPEG4_DECODER
2080  case AV_CODEC_ID_MPEG4:
2081 #endif
2082  st->codec->width = 0; /* let decoder init width/height */
2083  st->codec->height= 0;
2084  break;
2085  }
2086 
2087  /* Do not need those anymore. */
2088  av_freep(&sc->chunk_offsets);
2089  av_freep(&sc->stsc_data);
2090  av_freep(&sc->sample_sizes);
2091  av_freep(&sc->keyframes);
2092  av_freep(&sc->stts_data);
2093  av_freep(&sc->stps_data);
2094  av_freep(&sc->rap_group);
2095 
2096  return 0;
2097 }
2098 
2099 static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2100 {
2101  int ret;
2102  c->itunes_metadata = 1;
2103  ret = mov_read_default(c, pb, atom);
2104  c->itunes_metadata = 0;
2105  return ret;
2106 }
2107 
2108 static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2109 {
2110  while (atom.size > 8) {
2111  uint32_t tag = avio_rl32(pb);
2112  atom.size -= 4;
2113  if (tag == MKTAG('h','d','l','r')) {
2114  avio_seek(pb, -8, SEEK_CUR);
2115  atom.size += 8;
2116  return mov_read_default(c, pb, atom);
2117  }
2118  }
2119  return 0;
2120 }
2121 
2122 static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2123 {
2124  int i;
2125  int width;
2126  int height;
2127  int64_t disp_transform[2];
2128  int display_matrix[3][2];
2129  AVStream *st;
2130  MOVStreamContext *sc;
2131  int version;
2132 
2133  if (c->fc->nb_streams < 1)
2134  return 0;
2135  st = c->fc->streams[c->fc->nb_streams-1];
2136  sc = st->priv_data;
2137 
2138  version = avio_r8(pb);
2139  avio_rb24(pb); /* flags */
2140  /*
2141  MOV_TRACK_ENABLED 0x0001
2142  MOV_TRACK_IN_MOVIE 0x0002
2143  MOV_TRACK_IN_PREVIEW 0x0004
2144  MOV_TRACK_IN_POSTER 0x0008
2145  */
2146 
2147  if (version == 1) {
2148  avio_rb64(pb);
2149  avio_rb64(pb);
2150  } else {
2151  avio_rb32(pb); /* creation time */
2152  avio_rb32(pb); /* modification time */
2153  }
2154  st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/
2155  avio_rb32(pb); /* reserved */
2156 
2157  /* highlevel (considering edits) duration in movie timebase */
2158  (version == 1) ? avio_rb64(pb) : avio_rb32(pb);
2159  avio_rb32(pb); /* reserved */
2160  avio_rb32(pb); /* reserved */
2161 
2162  avio_rb16(pb); /* layer */
2163  avio_rb16(pb); /* alternate group */
2164  avio_rb16(pb); /* volume */
2165  avio_rb16(pb); /* reserved */
2166 
2167  //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)
2168  // they're kept in fixed point format through all calculations
2169  // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio
2170  for (i = 0; i < 3; i++) {
2171  display_matrix[i][0] = avio_rb32(pb); // 16.16 fixed point
2172  display_matrix[i][1] = avio_rb32(pb); // 16.16 fixed point
2173  avio_rb32(pb); // 2.30 fixed point (not used)
2174  }
2175 
2176  width = avio_rb32(pb); // 16.16 fixed point track width
2177  height = avio_rb32(pb); // 16.16 fixed point track height
2178  sc->width = width >> 16;
2179  sc->height = height >> 16;
2180 
2181  // transform the display width/height according to the matrix
2182  // skip this if the display matrix is the default identity matrix
2183  // or if it is rotating the picture, ex iPhone 3GS
2184  // to keep the same scale, use [width height 1<<16]
2185  if (width && height &&
2186  ((display_matrix[0][0] != 65536 ||
2187  display_matrix[1][1] != 65536) &&
2188  !display_matrix[0][1] &&
2189  !display_matrix[1][0] &&
2190  !display_matrix[2][0] && !display_matrix[2][1])) {
2191  for (i = 0; i < 2; i++)
2192  disp_transform[i] =
2193  (int64_t) width * display_matrix[0][i] +
2194  (int64_t) height * display_matrix[1][i] +
2195  ((int64_t) display_matrix[2][i] << 16);
2196 
2197  //sample aspect ratio is new width/height divided by old width/height
2198  st->sample_aspect_ratio = av_d2q(
2199  ((double) disp_transform[0] * height) /
2200  ((double) disp_transform[1] * width), INT_MAX);
2201  }
2202  return 0;
2203 }
2204 
2205 static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2206 {
2207  MOVFragment *frag = &c->fragment;
2208  MOVTrackExt *trex = NULL;
2209  int flags, track_id, i;
2210 
2211  avio_r8(pb); /* version */
2212  flags = avio_rb24(pb);
2213 
2214  track_id = avio_rb32(pb);
2215  if (!track_id)
2216  return AVERROR_INVALIDDATA;
2217  frag->track_id = track_id;
2218  for (i = 0; i < c->trex_count; i++)
2219  if (c->trex_data[i].track_id == frag->track_id) {
2220  trex = &c->trex_data[i];
2221  break;
2222  }
2223  if (!trex) {
2224  av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
2225  return AVERROR_INVALIDDATA;
2226  }
2227 
2228  frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?
2229  avio_rb64(pb) : frag->moof_offset;
2230  frag->stsd_id = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;
2231 
2232  frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?
2233  avio_rb32(pb) : trex->duration;
2234  frag->size = flags & MOV_TFHD_DEFAULT_SIZE ?
2235  avio_rb32(pb) : trex->size;
2236  frag->flags = flags & MOV_TFHD_DEFAULT_FLAGS ?
2237  avio_rb32(pb) : trex->flags;
2238  av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);
2239  return 0;
2240 }
2241 
2242 static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2243 {
2244  c->chapter_track = avio_rb32(pb);
2245  return 0;
2246 }
2247 
2248 static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2249 {
2250  MOVTrackExt *trex;
2251 
2252  if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))
2253  return AVERROR_INVALIDDATA;
2254  trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));
2255  if (!trex)
2256  return AVERROR(ENOMEM);
2257  c->trex_data = trex;
2258  trex = &c->trex_data[c->trex_count++];
2259  avio_r8(pb); /* version */
2260  avio_rb24(pb); /* flags */
2261  trex->track_id = avio_rb32(pb);
2262  trex->stsd_id = avio_rb32(pb);
2263  trex->duration = avio_rb32(pb);
2264  trex->size = avio_rb32(pb);
2265  trex->flags = avio_rb32(pb);
2266  return 0;
2267 }
2268 
2269 static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2270 {
2271  MOVFragment *frag = &c->fragment;
2272  AVStream *st = NULL;
2273  MOVStreamContext *sc;
2274  MOVStts *ctts_data;
2275  uint64_t offset;
2276  int64_t dts;
2277  int data_offset = 0;
2278  unsigned entries, first_sample_flags = frag->flags;
2279  int flags, distance, i, found_keyframe = 0;
2280 
2281  for (i = 0; i < c->fc->nb_streams; i++) {
2282  if (c->fc->streams[i]->id == frag->track_id) {
2283  st = c->fc->streams[i];
2284  break;
2285  }
2286  }
2287  if (!st) {
2288  av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);
2289  return AVERROR_INVALIDDATA;
2290  }
2291  sc = st->priv_data;
2292  if (sc->pseudo_stream_id+1 != frag->stsd_id)
2293  return 0;
2294  avio_r8(pb); /* version */
2295  flags = avio_rb24(pb);
2296  entries = avio_rb32(pb);
2297  av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);
2298 
2299  /* Always assume the presence of composition time offsets.
2300  * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.
2301  * 1) in the initial movie, there are no samples.
2302  * 2) in the first movie fragment, there is only one sample without composition time offset.
2303  * 3) in the subsequent movie fragments, there are samples with composition time offset. */
2304  if (!sc->ctts_count && sc->sample_count)
2305  {
2306  /* Complement ctts table if moov atom doesn't have ctts atom. */
2307  ctts_data = av_malloc(sizeof(*sc->ctts_data));
2308  if (!ctts_data)
2309  return AVERROR(ENOMEM);
2310  sc->ctts_data = ctts_data;
2311  sc->ctts_data[sc->ctts_count].count = sc->sample_count;
2312  sc->ctts_data[sc->ctts_count].duration = 0;
2313  sc->ctts_count++;
2314  }
2315  if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
2316  return AVERROR_INVALIDDATA;
2317  ctts_data = av_realloc(sc->ctts_data,
2318  (entries+sc->ctts_count)*sizeof(*sc->ctts_data));
2319  if (!ctts_data)
2320  return AVERROR(ENOMEM);
2321  sc->ctts_data = ctts_data;
2322 
2323  if (flags & MOV_TRUN_DATA_OFFSET) data_offset = avio_rb32(pb);
2324  if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);
2325  dts = sc->track_end - sc->time_offset;
2326  offset = frag->base_data_offset + data_offset;
2327  distance = 0;
2328  av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);
2329  for (i = 0; i < entries && !pb->eof_reached; i++) {
2330  unsigned sample_size = frag->size;
2331  int sample_flags = i ? frag->flags : first_sample_flags;
2332  unsigned sample_duration = frag->duration;
2333  int keyframe = 0;
2334 
2335  if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);
2336  if (flags & MOV_TRUN_SAMPLE_SIZE) sample_size = avio_rb32(pb);
2337  if (flags & MOV_TRUN_SAMPLE_FLAGS) sample_flags = avio_rb32(pb);
2338  sc->ctts_data[sc->ctts_count].count = 1;
2339  sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?
2340  avio_rb32(pb) : 0;
2341  sc->ctts_count++;
2342  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
2343  keyframe = 1;
2344  else if (!found_keyframe)
2345  keyframe = found_keyframe =
2346  !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |
2347  MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));
2348  if (keyframe)
2349  distance = 0;
2350  av_add_index_entry(st, offset, dts, sample_size, distance,
2351  keyframe ? AVINDEX_KEYFRAME : 0);
2352  av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
2353  "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
2354  offset, dts, sample_size, distance, keyframe);
2355  distance++;
2356  dts += sample_duration;
2357  offset += sample_size;
2358  sc->data_size += sample_size;
2359  }
2360 
2361  if (pb->eof_reached)
2362  return AVERROR_EOF;
2363 
2364  frag->moof_offset = offset;
2365  st->duration = sc->track_end = dts + sc->time_offset;
2366  return 0;
2367 }
2368 
2369 /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
2370 /* like the files created with Adobe Premiere 5.0, for samples see */
2371 /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
2372 static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2373 {
2374  int err;
2375 
2376  if (atom.size < 8)
2377  return 0; /* continue */
2378  if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
2379  avio_skip(pb, atom.size - 4);
2380  return 0;
2381  }
2382  atom.type = avio_rl32(pb);
2383  atom.size -= 8;
2384  if (atom.type != MKTAG('m','d','a','t')) {
2385  avio_skip(pb, atom.size);
2386  return 0;
2387  }
2388  err = mov_read_mdat(c, pb, atom);
2389  return err;
2390 }
2391 
2392 static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2393 {
2394 #if CONFIG_ZLIB
2395  AVIOContext ctx;
2396  uint8_t *cmov_data;
2397  uint8_t *moov_data; /* uncompressed data */
2398  long cmov_len, moov_len;
2399  int ret = -1;
2400 
2401  avio_rb32(pb); /* dcom atom */
2402  if (avio_rl32(pb) != MKTAG('d','c','o','m'))
2403  return AVERROR_INVALIDDATA;
2404  if (avio_rl32(pb) != MKTAG('z','l','i','b')) {
2405  av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");
2406  return AVERROR_INVALIDDATA;
2407  }
2408  avio_rb32(pb); /* cmvd atom */
2409  if (avio_rl32(pb) != MKTAG('c','m','v','d'))
2410  return AVERROR_INVALIDDATA;
2411  moov_len = avio_rb32(pb); /* uncompressed size */
2412  cmov_len = atom.size - 6 * 4;
2413 
2414  cmov_data = av_malloc(cmov_len);
2415  if (!cmov_data)
2416  return AVERROR(ENOMEM);
2417  moov_data = av_malloc(moov_len);
2418  if (!moov_data) {
2419  av_free(cmov_data);
2420  return AVERROR(ENOMEM);
2421  }
2422  avio_read(pb, cmov_data, cmov_len);
2423  if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
2424  goto free_and_return;
2425  if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
2426  goto free_and_return;
2427  atom.type = MKTAG('m','o','o','v');
2428  atom.size = moov_len;
2429  ret = mov_read_default(c, &ctx, atom);
2430 free_and_return:
2431  av_free(moov_data);
2432  av_free(cmov_data);
2433  return ret;
2434 #else
2435  av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
2436  return AVERROR(ENOSYS);
2437 #endif
2438 }
2439 
2440 /* edit list atom */
2441 static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2442 {
2443  MOVStreamContext *sc;
2444  int i, edit_count, version;
2445 
2446  if (c->fc->nb_streams < 1)
2447  return 0;
2448  sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;
2449 
2450  version = avio_r8(pb); /* version */
2451  avio_rb24(pb); /* flags */
2452  edit_count = avio_rb32(pb); /* entries */
2453 
2454  if ((uint64_t)edit_count*12+8 > atom.size)
2455  return AVERROR_INVALIDDATA;
2456 
2457  for (i=0; i<edit_count; i++){
2458  int64_t time;
2459  int64_t duration;
2460  if (version == 1) {
2461  duration = avio_rb64(pb);
2462  time = avio_rb64(pb);
2463  } else {
2464  duration = avio_rb32(pb); /* segment duration */
2465  time = (int32_t)avio_rb32(pb); /* media time */
2466  }
2467  avio_rb32(pb); /* Media rate */
2468  if (i == 0 && time >= -1) {
2469  sc->time_offset = time != -1 ? time : -duration;
2470  }
2471  }
2472 
2473  if (edit_count > 1)
2474  av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "
2475  "a/v desync might occur, patch welcome\n");
2476 
2477  av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);
2478  return 0;
2479 }
2480 
2481 static const MOVParseTableEntry mov_default_parse_table[] = {
2482 { MKTAG('a','v','s','s'), mov_read_extradata },
2483 { MKTAG('c','h','p','l'), mov_read_chpl },
2484 { MKTAG('c','o','6','4'), mov_read_stco },
2485 { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */
2486 { MKTAG('d','i','n','f'), mov_read_default },
2487 { MKTAG('d','r','e','f'), mov_read_dref },
2488 { MKTAG('e','d','t','s'), mov_read_default },
2489 { MKTAG('e','l','s','t'), mov_read_elst },
2490 { MKTAG('e','n','d','a'), mov_read_enda },
2491 { MKTAG('f','i','e','l'), mov_read_fiel },
2492 { MKTAG('f','t','y','p'), mov_read_ftyp },
2493 { MKTAG('g','l','b','l'), mov_read_glbl },
2494 { MKTAG('h','d','l','r'), mov_read_hdlr },
2495 { MKTAG('i','l','s','t'), mov_read_ilst },
2496 { MKTAG('j','p','2','h'), mov_read_extradata },
2497 { MKTAG('m','d','a','t'), mov_read_mdat },
2498 { MKTAG('m','d','h','d'), mov_read_mdhd },
2499 { MKTAG('m','d','i','a'), mov_read_default },
2500 { MKTAG('m','e','t','a'), mov_read_meta },
2501 { MKTAG('m','i','n','f'), mov_read_default },
2502 { MKTAG('m','o','o','f'), mov_read_moof },
2503 { MKTAG('m','o','o','v'), mov_read_moov },
2504 { MKTAG('m','v','e','x'), mov_read_default },
2505 { MKTAG('m','v','h','d'), mov_read_mvhd },
2506 { MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */
2507 { MKTAG('a','l','a','c'), mov_read_extradata }, /* alac specific atom */
2508 { MKTAG('a','v','c','C'), mov_read_glbl },
2509 { MKTAG('p','a','s','p'), mov_read_pasp },
2510 { MKTAG('s','t','b','l'), mov_read_default },
2511 { MKTAG('s','t','c','o'), mov_read_stco },
2512 { MKTAG('s','t','p','s'), mov_read_stps },
2513 { MKTAG('s','t','r','f'), mov_read_strf },
2514 { MKTAG('s','t','s','c'), mov_read_stsc },
2515 { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */
2516 { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */
2517 { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */
2518 { MKTAG('s','t','t','s'), mov_read_stts },
2519 { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */
2520 { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */
2521 { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */
2522 { MKTAG('t','r','a','k'), mov_read_trak },
2523 { MKTAG('t','r','a','f'), mov_read_default },
2524 { MKTAG('t','r','e','f'), mov_read_default },
2525 { MKTAG('c','h','a','p'), mov_read_chap },
2526 { MKTAG('t','r','e','x'), mov_read_trex },
2527 { MKTAG('t','r','u','n'), mov_read_trun },
2528 { MKTAG('u','d','t','a'), mov_read_default },
2529 { MKTAG('w','a','v','e'), mov_read_wave },
2530 { MKTAG('e','s','d','s'), mov_read_esds },
2531 { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */
2532 { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */
2533 { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
2534 { MKTAG('w','f','e','x'), mov_read_wfex },
2535 { MKTAG('c','m','o','v'), mov_read_cmov },
2536 { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */
2537 { MKTAG('d','v','c','1'), mov_read_dvc1 },
2538 { MKTAG('s','b','g','p'), mov_read_sbgp },
2539 { 0, NULL }
2540 };
2541 
2542 static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
2543 {
2544  int64_t total_size = 0;
2545  MOVAtom a;
2546  int i;
2547 
2548  if (atom.size < 0)
2549  atom.size = INT64_MAX;
2550  while (total_size + 8 < atom.size && !pb->eof_reached) {
2551  int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;
2552  a.size = atom.size;
2553  a.type=0;
2554  if (atom.size >= 8) {
2555  a.size = avio_rb32(pb);
2556  a.type = avio_rl32(pb);
2557  }
2558  av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",
2559  a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);
2560  total_size += 8;
2561  if (a.size == 1) { /* 64 bit extended size */
2562  a.size = avio_rb64(pb) - 8;
2563  total_size += 8;
2564  }
2565  if (a.size == 0) {
2566  a.size = atom.size - total_size;
2567  if (a.size <= 8)
2568  break;
2569  }
2570  a.size -= 8;
2571  if (a.size < 0)
2572  break;
2573  a.size = FFMIN(a.size, atom.size - total_size);
2574 
2575  for (i = 0; mov_default_parse_table[i].type; i++)
2576  if (mov_default_parse_table[i].type == a.type) {
2577  parse = mov_default_parse_table[i].parse;
2578  break;
2579  }
2580 
2581  // container is user data
2582  if (!parse && (atom.type == MKTAG('u','d','t','a') ||
2583  atom.type == MKTAG('i','l','s','t')))
2584  parse = mov_read_udta_string;
2585 
2586  if (!parse) { /* skip leaf atoms data */
2587  avio_skip(pb, a.size);
2588  } else {
2589  int64_t start_pos = avio_tell(pb);
2590  int64_t left;
2591  int err = parse(c, pb, a);
2592  if (err < 0)
2593  return err;
2594  if (c->found_moov && c->found_mdat &&
2595  ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||
2596  start_pos + a.size == avio_size(pb))) {
2597  if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)
2598  c->next_root_atom = start_pos + a.size;
2599  return 0;
2600  }
2601  left = a.size - avio_tell(pb) + start_pos;
2602  if (left > 0) /* skip garbage at atom end */
2603  avio_skip(pb, left);
2604  }
2605 
2606  total_size += a.size;
2607  }
2608 
2609  if (total_size < atom.size && atom.size < 0x7ffff)
2610  avio_skip(pb, atom.size - total_size);
2611 
2612  return 0;
2613 }
2614 
2615 static int mov_probe(AVProbeData *p)
2616 {
2617  unsigned int offset;
2618  uint32_t tag;
2619  int score = 0;
2620 
2621  /* check file header */
2622  offset = 0;
2623  for (;;) {
2624  /* ignore invalid offset */
2625  if ((offset + 8) > (unsigned int)p->buf_size)
2626  return score;
2627  tag = AV_RL32(p->buf + offset + 4);
2628  switch(tag) {
2629  /* check for obvious tags */
2630  case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */
2631  case MKTAG('m','o','o','v'):
2632  case MKTAG('m','d','a','t'):
2633  case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
2634  case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
2635  case MKTAG('f','t','y','p'):
2636  return AVPROBE_SCORE_MAX;
2637  /* those are more common words, so rate then a bit less */
2638  case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
2639  case MKTAG('w','i','d','e'):
2640  case MKTAG('f','r','e','e'):
2641  case MKTAG('j','u','n','k'):
2642  case MKTAG('p','i','c','t'):
2643  return AVPROBE_SCORE_MAX - 5;
2644  case MKTAG(0x82,0x82,0x7f,0x7d):
2645  case MKTAG('s','k','i','p'):
2646  case MKTAG('u','u','i','d'):
2647  case MKTAG('p','r','f','l'):
2648  offset = AV_RB32(p->buf+offset) + offset;
2649  /* if we only find those cause probedata is too small at least rate them */
2650  score = AVPROBE_SCORE_MAX - 50;
2651  break;
2652  default:
2653  /* unrecognized tag */
2654  return score;
2655  }
2656  }
2657 }
2658 
2659 // must be done after parsing all trak because there's no order requirement
2660 static void mov_read_chapters(AVFormatContext *s)
2661 {
2662  MOVContext *mov = s->priv_data;
2663  AVStream *st = NULL;
2664  MOVStreamContext *sc;
2665  int64_t cur_pos;
2666  int i;
2667 
2668  for (i = 0; i < s->nb_streams; i++)
2669  if (s->streams[i]->id == mov->chapter_track) {
2670  st = s->streams[i];
2671  break;
2672  }
2673  if (!st) {
2674  av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
2675  return;
2676  }
2677 
2678  st->discard = AVDISCARD_ALL;
2679  sc = st->priv_data;
2680  cur_pos = avio_tell(sc->pb);
2681 
2682  for (i = 0; i < st->nb_index_entries; i++) {
2683  AVIndexEntry *sample = &st->index_entries[i];
2684  int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
2685  uint8_t *title;
2686  uint16_t ch;
2687  int len, title_len;
2688 
2689  if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
2690  av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);
2691  goto finish;
2692  }
2693 
2694  // the first two bytes are the length of the title
2695  len = avio_rb16(sc->pb);
2696  if (len > sample->size-2)
2697  continue;
2698  title_len = 2*len + 1;
2699  if (!(title = av_mallocz(title_len)))
2700  goto finish;
2701 
2702  // The samples could theoretically be in any encoding if there's an encd
2703  // atom following, but in practice are only utf-8 or utf-16, distinguished
2704  // instead by the presence of a BOM
2705  if (!len) {
2706  title[0] = 0;
2707  } else {
2708  ch = avio_rb16(sc->pb);
2709  if (ch == 0xfeff)
2710  avio_get_str16be(sc->pb, len, title, title_len);
2711  else if (ch == 0xfffe)
2712  avio_get_str16le(sc->pb, len, title, title_len);
2713  else {
2714  AV_WB16(title, ch);
2715  if (len == 1 || len == 2)
2716  title[len] = 0;
2717  else
2718  avio_get_str(sc->pb, len - 2, title + 2, title_len - 2);
2719  }
2720  }
2721 
2722  avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);
2723  av_freep(&title);
2724  }
2725 finish:
2726  avio_seek(sc->pb, cur_pos, SEEK_SET);
2727 }
2728 
2729 static int mov_read_close(AVFormatContext *s)
2730 {
2731  MOVContext *mov = s->priv_data;
2732  int i, j;
2733 
2734  for (i = 0; i < s->nb_streams; i++) {
2735  AVStream *st = s->streams[i];
2736  MOVStreamContext *sc = st->priv_data;
2737 
2738  av_freep(&sc->ctts_data);
2739  for (j = 0; j < sc->drefs_count; j++) {
2740  av_freep(&sc->drefs[j].path);
2741  av_freep(&sc->drefs[j].dir);
2742  }
2743  av_freep(&sc->drefs);
2744  if (sc->pb && sc->pb != s->pb)
2745  avio_close(sc->pb);
2746  }
2747 
2748  if (mov->dv_demux) {
2749  for (i = 0; i < mov->dv_fctx->nb_streams; i++) {
2750  av_freep(&mov->dv_fctx->streams[i]->codec);
2751  av_freep(&mov->dv_fctx->streams[i]);
2752  }
2753  av_freep(&mov->dv_fctx);
2754  av_freep(&mov->dv_demux);
2755  }
2756 
2757  av_freep(&mov->trex_data);
2758 
2759  return 0;
2760 }
2761 
2762 static int mov_read_header(AVFormatContext *s)
2763 {
2764  MOVContext *mov = s->priv_data;
2765  AVIOContext *pb = s->pb;
2766  int err;
2767  MOVAtom atom = { AV_RL32("root") };
2768 
2769  mov->fc = s;
2770  /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
2771  if (pb->seekable)
2772  atom.size = avio_size(pb);
2773  else
2774  atom.size = INT64_MAX;
2775 
2776  /* check MOV header */
2777  if ((err = mov_read_default(mov, pb, atom)) < 0) {
2778  av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);
2779  mov_read_close(s);
2780  return err;
2781  }
2782  if (!mov->found_moov) {
2783  av_log(s, AV_LOG_ERROR, "moov atom not found\n");
2784  mov_read_close(s);
2785  return AVERROR_INVALIDDATA;
2786  }
2787  av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));
2788 
2789  if (pb->seekable && mov->chapter_track > 0)
2790  mov_read_chapters(s);
2791 
2792  if (mov->trex_data) {
2793  int i;
2794  for (i = 0; i < s->nb_streams; i++) {
2795  AVStream *st = s->streams[i];
2796  MOVStreamContext *sc = st->priv_data;
2797  if (st->duration)
2798  st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;
2799  }
2800  }
2801 
2802  return 0;
2803 }
2804 
2805 static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
2806 {
2807  AVIndexEntry *sample = NULL;
2808  int64_t best_dts = INT64_MAX;
2809  int i;
2810  for (i = 0; i < s->nb_streams; i++) {
2811  AVStream *avst = s->streams[i];
2812  MOVStreamContext *msc = avst->priv_data;
2813  if (msc->pb && msc->current_sample < avst->nb_index_entries) {
2814  AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
2815  int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
2816  av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
2817  if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||
2818  (s->pb->seekable &&
2819  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
2820  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
2821  (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
2822  sample = current_sample;
2823  best_dts = dts;
2824  *st = avst;
2825  }
2826  }
2827  }
2828  return sample;
2829 }
2830 
2831 static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
2832 {
2833  MOVContext *mov = s->priv_data;
2834  MOVStreamContext *sc;
2835  AVIndexEntry *sample;
2836  AVStream *st = NULL;
2837  int ret;
2838  retry:
2839  sample = mov_find_next_sample(s, &st);
2840  if (!sample) {
2841  mov->found_mdat = 0;
2842  if (!mov->next_root_atom)
2843  return AVERROR_EOF;
2844  avio_seek(s->pb, mov->next_root_atom, SEEK_SET);
2845  mov->next_root_atom = 0;
2846  if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
2847  s->pb->eof_reached)
2848  return AVERROR_EOF;
2849  av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
2850  goto retry;
2851  }
2852  sc = st->priv_data;
2853  /* must be done just before reading, to avoid infinite loop on sample */
2854  sc->current_sample++;
2855 
2856  if (st->discard != AVDISCARD_ALL) {
2857  if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
2858  av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
2859  sc->ffindex, sample->pos);
2860  return AVERROR_INVALIDDATA;
2861  }
2862  ret = av_get_packet(sc->pb, pkt, sample->size);
2863  if (ret < 0)
2864  return ret;
2865  if (sc->has_palette) {
2866  uint8_t *pal;
2867 
2868  pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
2869  if (!pal) {
2870  av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");
2871  } else {
2872  memcpy(pal, sc->palette, AVPALETTE_SIZE);
2873  sc->has_palette = 0;
2874  }
2875  }
2876 #if CONFIG_DV_DEMUXER
2877  if (mov->dv_demux && sc->dv_audio_container) {
2878  avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);
2879  av_free(pkt->data);
2880  pkt->size = 0;
2881  ret = avpriv_dv_get_packet(mov->dv_demux, pkt);
2882  if (ret < 0)
2883  return ret;
2884  }
2885 #endif
2886  }
2887 
2888  pkt->stream_index = sc->ffindex;
2889  pkt->dts = sample->timestamp;
2890  if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {
2891  pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
2892  /* update ctts context */
2893  sc->ctts_sample++;
2894  if (sc->ctts_index < sc->ctts_count &&
2895  sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
2896  sc->ctts_index++;
2897  sc->ctts_sample = 0;
2898  }
2899  if (sc->wrong_dts)
2900  pkt->dts = AV_NOPTS_VALUE;
2901  } else {
2902  int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?
2903  st->index_entries[sc->current_sample].timestamp : st->duration;
2904  pkt->duration = next_dts - pkt->dts;
2905  pkt->pts = pkt->dts;
2906  }
2907  if (st->discard == AVDISCARD_ALL)
2908  goto retry;
2909  pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
2910  pkt->pos = sample->pos;
2911  av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",
2912  pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
2913  return 0;
2914 }
2915 
2916 static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
2917 {
2918  MOVStreamContext *sc = st->priv_data;
2919  int sample, time_sample;
2920  int i;
2921 
2922  sample = av_index_search_timestamp(st, timestamp, flags);
2923  av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
2924  if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)
2925  sample = 0;
2926  if (sample < 0) /* not sure what to do */
2927  return AVERROR_INVALIDDATA;
2928  sc->current_sample = sample;
2929  av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);
2930  /* adjust ctts index */
2931  if (sc->ctts_data) {
2932  time_sample = 0;
2933  for (i = 0; i < sc->ctts_count; i++) {
2934  int next = time_sample + sc->ctts_data[i].count;
2935  if (next > sc->current_sample) {
2936  sc->ctts_index = i;
2937  sc->ctts_sample = sc->current_sample - time_sample;
2938  break;
2939  }
2940  time_sample = next;
2941  }
2942  }
2943  return sample;
2944 }
2945 
2946 static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
2947 {
2948  AVStream *st;
2949  int64_t seek_timestamp, timestamp;
2950  int sample;
2951  int i;
2952 
2953  if (stream_index >= s->nb_streams)
2954  return AVERROR_INVALIDDATA;
2955  if (sample_time < 0)
2956  sample_time = 0;
2957 
2958  st = s->streams[stream_index];
2959  sample = mov_seek_stream(s, st, sample_time, flags);
2960  if (sample < 0)
2961  return sample;
2962 
2963  /* adjust seek timestamp to found sample timestamp */
2964  seek_timestamp = st->index_entries[sample].timestamp;
2965 
2966  for (i = 0; i < s->nb_streams; i++) {
2967  st = s->streams[i];
2968  if (stream_index == i)
2969  continue;
2970 
2971  timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
2972  mov_seek_stream(s, st, timestamp, flags);
2973  }
2974  return 0;
2975 }
2976 
2977 AVInputFormat ff_mov_demuxer = {
2978  .name = "mov,mp4,m4a,3gp,3g2,mj2",
2979  .long_name = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),
2980  .priv_data_size = sizeof(MOVContext),
2981  .read_probe = mov_probe,
2982  .read_header = mov_read_header,
2983  .read_packet = mov_read_packet,
2984  .read_close = mov_read_close,
2985  .read_seek = mov_read_seek,
2986 };