aboutsummaryrefslogtreecommitdiffstats
path: root/src/mp4ff/mp4atom.c
blob: b75a3da7f23dae132df7e96399c44f25b88d137e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
**
** $Id: mp4atom.c,v 1.17 2004/01/11 15:52:18 menno Exp $
**/

#include <stdlib.h>
#include "mp4ffint.h"

#include "drms.h"

/* parse atom header size */
static int32_t mp4ff_atom_get_size(const int8_t *data)
{
    uint32_t result;
    uint32_t a, b, c, d;

    a = (uint8_t)data[0];
    b = (uint8_t)data[1];
    c = (uint8_t)data[2];
    d = (uint8_t)data[3];

    result = (a<<24) | (b<<16) | (c<<8) | d;
    //if (result > 0 && result < 8) result = 8;

    return (int32_t)result;
}

/* comnapre 2 atom names, returns 1 for equal, 0 for unequal */
static int32_t mp4ff_atom_compare(const int8_t a1, const int8_t b1, const int8_t c1, const int8_t d1,
                                  const int8_t a2, const int8_t b2, const int8_t c2, const int8_t d2)
{
    if (a1 == a2 && b1 == b2 && c1 == c2 && d1 == d2)
        return 1;
    else
        return 0;
}

static uint8_t mp4ff_atom_name_to_type(const int8_t a, const int8_t b,
                                       const int8_t c, const int8_t d)
{
    if (a == 'm')
    {
        if (mp4ff_atom_compare(a,b,c,d, 'm','o','o','v'))
            return ATOM_MOOV;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','i','n','f'))
            return ATOM_MINF;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','d','i','a'))
            return ATOM_MDIA;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','d','a','t'))
            return ATOM_MDAT;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','d','h','d'))
            return ATOM_MDHD;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','v','h','d'))
            return ATOM_MVHD;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','p','4','a'))
            return ATOM_MP4A;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','p','4','v'))
            return ATOM_MP4V;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','p','4','s'))
            return ATOM_MP4S;
        else if (mp4ff_atom_compare(a,b,c,d, 'm','e','t','a'))
            return ATOM_META;
    } else if (a == 't') {
        if (mp4ff_atom_compare(a,b,c,d, 't','r','a','k'))
            return ATOM_TRAK;
        else if (mp4ff_atom_compare(a,b,c,d, 't','k','h','d'))
            return ATOM_TKHD;
        else if (mp4ff_atom_compare(a,b,c,d, 't','r','e','f'))
            return ATOM_TREF;
        else if (mp4ff_atom_compare(a,b,c,d, 't','r','k','n'))
            return ATOM_TRACK;
        else if (mp4ff_atom_compare(a,b,c,d, 't','m','p','o'))
            return ATOM_TEMPO;
    } else if (a == 's') {
        if (mp4ff_atom_compare(a,b,c,d, 's','t','b','l'))
            return ATOM_STBL;
        else if (mp4ff_atom_compare(a,b,c,d, 's','m','h','d'))
            return ATOM_SMHD;
        else if (mp4ff_atom_compare(a,b,c,d, 's','t','s','d'))
            return ATOM_STSD;
        else if (mp4ff_atom_compare(a,b,c,d, 's','t','t','s'))
            return ATOM_STTS;
        else if (mp4ff_atom_compare(a,b,c,d, 's','t','c','o'))
            return ATOM_STCO;
        else if (mp4ff_atom_compare(a,b,c,d, 's','t','s','c'))
            return ATOM_STSC;
        else if (mp4ff_atom_compare(a,b,c,d, 's','t','s','z'))
            return ATOM_STSZ;
        else if (mp4ff_atom_compare(a,b,c,d, 's','t','z','2'))
            return ATOM_STZ2;
        else if (mp4ff_atom_compare(a,b,c,d, 's','k','i','p'))
            return ATOM_SKIP;
        else if (mp4ff_atom_compare(a,b,c,d, 's','i','n','f'))
            return ATOM_SINF;
        else if (mp4ff_atom_compare(a,b,c,d, 's','c','h','i'))
            return ATOM_SCHI;
    } else if (a == '�') {
        if (mp4ff_atom_compare(a,b,c,d, '�','n','a','m'))
            return ATOM_TITLE;
        else if (mp4ff_atom_compare(a,b,c,d, '�','A','R','T'))
            return ATOM_ARTIST;
        else if (mp4ff_atom_compare(a,b,c,d, '�','w','r','t'))
            return ATOM_WRITER;
        else if (mp4ff_atom_compare(a,b,c,d, '�','a','l','b'))
            return ATOM_ALBUM;
        else if (mp4ff_atom_compare(a,b,c,d, '�','d','a','y'))
            return ATOM_DATE;
        else if (mp4ff_atom_compare(a,b,c,d, '�','t','o','o'))
            return ATOM_TOOL;
        else if (mp4ff_atom_compare(a,b,c,d, '�','c','m','t'))
            return ATOM_COMMENT;
        else if (mp4ff_atom_compare(a,b,c,d, '�','g','e','n'))
            return ATOM_GENRE1;
    }

    if (mp4ff_atom_compare(a,b,c,d, 'e','d','t','s'))
        return ATOM_EDTS;
    else if (mp4ff_atom_compare(a,b,c,d, 'e','s','d','s'))
        return ATOM_ESDS;
    else if (mp4ff_atom_compare(a,b,c,d, 'f','t','y','p'))
        return ATOM_FTYP;
    else if (mp4ff_atom_compare(a,b,c,d, 'f','r','e','e'))
        return ATOM_FREE;
    else if (mp4ff_atom_compare(a,b,c,d, 'h','m','h','d'))
        return ATOM_HMHD;
    else if (mp4ff_atom_compare(a,b,c,d, 'v','m','h','d'))
        return ATOM_VMHD;
    else if (mp4ff_atom_compare(a,b,c,d, 'u','d','t','a'))
        return ATOM_UDTA;
    else if (mp4ff_atom_compare(a,b,c,d, 'i','l','s','t'))
        return ATOM_ILST;
    else if (mp4ff_atom_compare(a,b,c,d, 'n','a','m','e'))
        return ATOM_NAME;
    else if (mp4ff_atom_compare(a,b,c,d, 'd','a','t','a'))
        return ATOM_DATA;
    else if (mp4ff_atom_compare(a,b,c,d, 'd','i','s','k'))
        return ATOM_DISC;
    else if (mp4ff_atom_compare(a,b,c,d, 'g','n','r','e'))
        return ATOM_GENRE2;
    else if (mp4ff_atom_compare(a,b,c,d, 'c','o','v','r'))
		return ATOM_COVER;
    else if (mp4ff_atom_compare(a,b,c,d, 'c','p','i','l'))
        return ATOM_COMPILATION;
    else if (mp4ff_atom_compare(a,b,c,d, 'c','t','t','s'))
		return ATOM_CTTS;
    else if (mp4ff_atom_compare(a,b,c,d, 'd','r','m','s'))
		return ATOM_DRMS;
    else if (mp4ff_atom_compare(a,b,c,d, 'f','r','m','a'))
		return ATOM_FRMA;
    else if (mp4ff_atom_compare(a,b,c,d, 'p','r','i','v'))
		return ATOM_PRIV;
    else if (mp4ff_atom_compare(a,b,c,d, 'i','v','i','v'))
		return ATOM_IVIV;
	else
        return ATOM_UNKNOWN;
}

/* read atom header, return atom size, atom size is with header included */
uint64_t mp4ff_atom_read_header(mp4ff_t *f, uint8_t *atom_type, uint8_t *header_size)
{
    uint64_t size;
    int32_t ret;
    int8_t atom_header[8];

    ret = mp4ff_read_data(f, atom_header, 8);
    if (ret != 8)
        return 0;

    size = mp4ff_atom_get_size(atom_header);
    *header_size = 8;

    /* check for 64 bit atom size */
    if (size == 1)
    {
        *header_size = 16;
        size = mp4ff_read_int64(f);
    }

    //printf("%c%c%c%c\n", atom_header[4], atom_header[5], atom_header[6], atom_header[7]);

    *atom_type = mp4ff_atom_name_to_type(atom_header[4], atom_header[5], atom_header[6], atom_header[7]);

    return size;
}

static int32_t mp4ff_read_stsz(mp4ff_t *f)
{
    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */
    f->track[f->total_tracks - 1]->stsz_sample_size = mp4ff_read_int32(f);
    f->track[f->total_tracks - 1]->stsz_sample_count = mp4ff_read_int32(f);

    if (f->track[f->total_tracks - 1]->stsz_sample_size == 0)
    {
        int32_t i;
        f->track[f->total_tracks - 1]->stsz_table =
            (int32_t*)malloc(f->track[f->total_tracks - 1]->stsz_sample_count*sizeof(int32_t));

        for (i = 0; i < f->track[f->total_tracks - 1]->stsz_sample_count; i++)
        {
            f->track[f->total_tracks - 1]->stsz_table[i] = mp4ff_read_int32(f);
        }
    }

    return 0;
}

static int32_t mp4ff_read_esds(mp4ff_t *f)
{
    uint8_t tag;
	uint32_t temp;
	
    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */

    /* get and verify ES_DescrTag */
    tag = mp4ff_read_char(f);
    if (tag == 0x03)
    {
        /* read length */
        if (mp4ff_read_mp4_descr_length(f) < 5 + 15)
        {
            return 1;
        }
        /* skip 3 bytes */
        mp4ff_read_int24(f);
    } else {
        /* skip 2 bytes */
        mp4ff_read_int16(f);
    }

    /* get and verify DecoderConfigDescrTab */
    if (mp4ff_read_char(f) != 0x04)
    {
        return 1;
    }

    /* read length */
	temp = mp4ff_read_mp4_descr_length(f);
    if (temp < 13) return 1;

	f->track[f->total_tracks - 1]->audioType = mp4ff_read_char(f);
    mp4ff_read_int32(f);//0x15000414 ????
    f->track[f->total_tracks - 1]->maxBitrate = mp4ff_read_int32(f);
    f->track[f->total_tracks - 1]->avgBitrate = mp4ff_read_int32(f);
    
    /* get and verify DecSpecificInfoTag */
    if (mp4ff_read_char(f) != 0x05)
    {
        return 1;
    }

    /* read length */
    f->track[f->total_tracks - 1]->decoderConfigLen = mp4ff_read_mp4_descr_length(f); 

    if (f->track[f->total_tracks - 1]->decoderConfig)
        free(f->track[f->total_tracks - 1]->decoderConfig);
    f->track[f->total_tracks - 1]->decoderConfig = malloc(f->track[f->total_tracks - 1]->decoderConfigLen);
    if (f->track[f->total_tracks - 1]->decoderConfig)
    {
        mp4ff_read_data(f, f->track[f->total_tracks - 1]->decoderConfig, f->track[f->total_tracks - 1]->decoderConfigLen);
    } else {
        f->track[f->total_tracks - 1]->decoderConfigLen = 0;
    }

    /* will skip the remainder of the atom */
    return 0;
}

static int32_t mp4ff_read_mp4a(mp4ff_t *f)
{
    uint64_t size;
    int32_t i;
    uint8_t atom_type = 0;
    uint8_t header_size = 0;

    for (i = 0; i < 6; i++)
    {
        mp4ff_read_char(f); /* reserved */
    }
    /* data_reference_index */ mp4ff_read_int16(f);

    mp4ff_read_int32(f); /* reserved */
    mp4ff_read_int32(f); /* reserved */

    f->track[f->total_tracks - 1]->channelCount = mp4ff_read_int16(f);
    f->track[f->total_tracks - 1]->sampleSize = mp4ff_read_int16(f);

    mp4ff_read_int16(f);
    mp4ff_read_int16(f);

    f->track[f->total_tracks - 1]->sampleRate = mp4ff_read_int16(f);

    mp4ff_read_int16(f);

    size = mp4ff_atom_read_header(f, &atom_type, &header_size);
    if (atom_type == ATOM_ESDS)
    {
        mp4ff_read_esds(f);
    }

    return 0;
}

#ifdef ITUNES_DRM
static int32_t mp4ff_read_drms(mp4ff_t *f, uint64_t skip)
{
    uint64_t size;
    int32_t i;
    uint8_t atom_type = 0;
    uint8_t header_size = 0;
    uint32_t drms_user_key[4];

    if (drms_get_user_key(NULL, drms_user_key) == 0)
    {
        f->track[f->total_tracks - 1]->p_drms = drms_alloc();

        drms_init( f->track[f->total_tracks - 1]->p_drms,
            DRMS_INIT_UKEY, (uint8_t *)drms_user_key,
            sizeof(drms_user_key) );
    }

    for (i = 0; i < 6; i++)
    {
        mp4ff_read_char(f); /* reserved */
    }
    /* data_reference_index */ mp4ff_read_int16(f);

    mp4ff_read_int32(f); /* reserved */
    mp4ff_read_int32(f); /* reserved */

    f->track[f->total_tracks - 1]->channelCount = mp4ff_read_int16(f);
    f->track[f->total_tracks - 1]->sampleSize = mp4ff_read_int16(f);

    mp4ff_read_int16(f);
    mp4ff_read_int16(f);

    f->track[f->total_tracks - 1]->sampleRate = mp4ff_read_int16(f);

    mp4ff_read_int16(f);

    size = mp4ff_atom_read_header(f, &atom_type, &header_size);
    if (atom_type == ATOM_ESDS)
    {
        mp4ff_read_esds(f);
    }
    mp4ff_set_position(f, skip+size+28);

    size = mp4ff_atom_read_header(f, &atom_type, &header_size);
    if (atom_type == ATOM_SINF)
    {
        parse_sub_atoms(f, size-header_size);
    }

    return 0;
}

static int32_t mp4ff_read_frma(mp4ff_t *f)
{
    uint8_t atom_type;
    int8_t type[4];

    mp4ff_read_data(f, type, 4);

    atom_type = mp4ff_atom_name_to_type(type[0], type[1], type[2], type[3]);

    if (atom_type == ATOM_MP4A)
    {
        f->track[f->total_tracks - 1]->type = TRACK_AUDIO;
    } else if (atom_type == ATOM_MP4V) {
        f->track[f->total_tracks - 1]->type = TRACK_VIDEO;
    } else if (atom_type == ATOM_MP4S) {
        f->track[f->total_tracks - 1]->type = TRACK_SYSTEM;
    } else {
        f->track[f->total_tracks - 1]->type = TRACK_UNKNOWN;
    }

    return 0;
}

static int32_t mp4ff_read_name(mp4ff_t *f, uint64_t size)
{
    uint8_t *data = malloc(size);
    mp4ff_read_data(f, data, size);

    if (f->track[f->total_tracks - 1]->p_drms != NULL)
    {
        drms_init(f->track[f->total_tracks - 1]->p_drms,
            DRMS_INIT_NAME, data, strlen(data) );
    }

    if (data)
        free(data);

    return 0;
}

static int32_t mp4ff_read_priv(mp4ff_t *f, uint64_t size)
{
    uint8_t *data = malloc(size);
    mp4ff_read_data(f, data, size);

    if (f->track[f->total_tracks - 1]->p_drms != 0)
    {
        drms_init(f->track[f->total_tracks - 1]->p_drms,
            DRMS_INIT_PRIV, data, size );
    }

    if (data)
        free(data);

    return 0;
}

static int32_t mp4ff_read_iviv(mp4ff_t *f, uint64_t size)
{
    uint8_t *data = malloc(size);
    mp4ff_read_data(f, data, size);

    if (f->track[f->total_tracks - 1]->p_drms != 0)
    {
        drms_init(f->track[f->total_tracks - 1]->p_drms,
            DRMS_INIT_IVIV, data, sizeof(uint32_t) * 4 );
    }

    if (data)
        free(data);

    return 0;
}
#endif

static int32_t mp4ff_read_stsd(mp4ff_t *f)
{
    int32_t i;
    uint8_t header_size = 0;

    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */

    f->track[f->total_tracks - 1]->stsd_entry_count = mp4ff_read_int32(f);

    for (i = 0; i < f->track[f->total_tracks - 1]->stsd_entry_count; i++)
    {
        uint64_t skip = mp4ff_position(f);
        uint64_t size;
        uint8_t atom_type = 0;
        size = mp4ff_atom_read_header(f, &atom_type, &header_size);
        skip += size;

        if (atom_type == ATOM_MP4A)
        {
            f->track[f->total_tracks - 1]->type = TRACK_AUDIO;
            mp4ff_read_mp4a(f);
        } else if (atom_type == ATOM_MP4V) {
            f->track[f->total_tracks - 1]->type = TRACK_VIDEO;
        } else if (atom_type == ATOM_MP4S) {
            f->track[f->total_tracks - 1]->type = TRACK_SYSTEM;
#ifdef ITUNES_DRM
        } else if (atom_type == ATOM_DRMS) {
            // track type is read from the "frma" atom
            f->track[f->total_tracks - 1]->type = TRACK_UNKNOWN;
            mp4ff_read_drms(f, skip-size+header_size);
#endif
        } else {
            f->track[f->total_tracks - 1]->type = TRACK_UNKNOWN;
        }

        mp4ff_set_position(f, skip);
    }

    return 0;
}

static int32_t mp4ff_read_stsc(mp4ff_t *f)
{
    int32_t i;

    mp4ff_read_char(f); /* version */ 
    mp4ff_read_int24(f); /* flags */ 
    f->track[f->total_tracks - 1]->stsc_entry_count = mp4ff_read_int32(f);

    f->track[f->total_tracks - 1]->stsc_first_chunk =
        (int32_t*)malloc(f->track[f->total_tracks - 1]->stsc_entry_count*sizeof(int32_t));
    f->track[f->total_tracks - 1]->stsc_samples_per_chunk =
        (int32_t*)malloc(f->track[f->total_tracks - 1]->stsc_entry_count*sizeof(int32_t));
    f->track[f->total_tracks - 1]->stsc_sample_desc_index =
        (int32_t*)malloc(f->track[f->total_tracks - 1]->stsc_entry_count*sizeof(int32_t));

    for (i = 0; i < f->track[f->total_tracks - 1]->stsc_entry_count; i++)
    {
        f->track[f->total_tracks - 1]->stsc_first_chunk[i] = mp4ff_read_int32(f);
        f->track[f->total_tracks - 1]->stsc_samples_per_chunk[i] = mp4ff_read_int32(f);
        f->track[f->total_tracks - 1]->stsc_sample_desc_index[i] = mp4ff_read_int32(f);
    }

    return 0;
}

static int32_t mp4ff_read_stco(mp4ff_t *f)
{
    int32_t i;

    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */
    f->track[f->total_tracks - 1]->stco_entry_count = mp4ff_read_int32(f);

    f->track[f->total_tracks - 1]->stco_chunk_offset =
        (int32_t*)malloc(f->track[f->total_tracks - 1]->stco_entry_count*sizeof(int32_t));

    for (i = 0; i < f->track[f->total_tracks - 1]->stco_entry_count; i++)
    {
        f->track[f->total_tracks - 1]->stco_chunk_offset[i] = mp4ff_read_int32(f);
    }

    return 0;
}

static int32_t mp4ff_read_ctts(mp4ff_t *f)
{
    int32_t i;
	mp4ff_track_t * p_track = f->track[f->total_tracks - 1];

	if (p_track->ctts_entry_count) return 0;

    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */
    p_track->ctts_entry_count = mp4ff_read_int32(f);

    p_track->ctts_sample_count = (int32_t*)malloc(p_track->ctts_entry_count * sizeof(int32_t));
    p_track->ctts_sample_offset = (int32_t*)malloc(p_track->ctts_entry_count * sizeof(int32_t));

	if (p_track->ctts_sample_count == 0 || p_track->ctts_sample_offset == 0)
	{
		if (p_track->ctts_sample_count) {free(p_track->ctts_sample_count);p_track->ctts_sample_count=0;}
		if (p_track->ctts_sample_offset) {free(p_track->ctts_sample_offset);p_track->ctts_sample_offset=0;}
		p_track->ctts_entry_count = 0;
		return 0;
	}
	else
	{
		for (i = 0; i < f->track[f->total_tracks - 1]->ctts_entry_count; i++)
		{
			p_track->ctts_sample_count[i] = mp4ff_read_int32(f);
			p_track->ctts_sample_offset[i] = mp4ff_read_int32(f);
		}
		return 1;
	}
}

static int32_t mp4ff_read_stts(mp4ff_t *f)
{
    int32_t i;
	mp4ff_track_t * p_track = f->track[f->total_tracks - 1];

	if (p_track->stts_entry_count) return 0;

    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */
    p_track->stts_entry_count = mp4ff_read_int32(f);

    p_track->stts_sample_count = (int32_t*)malloc(p_track->stts_entry_count * sizeof(int32_t));
    p_track->stts_sample_delta = (int32_t*)malloc(p_track->stts_entry_count * sizeof(int32_t));
	
	if (p_track->stts_sample_count == 0 || p_track->stts_sample_delta == 0)
	{
		if (p_track->stts_sample_count) {free(p_track->stts_sample_count);p_track->stts_sample_count=0;}
		if (p_track->stts_sample_delta) {free(p_track->stts_sample_delta);p_track->stts_sample_delta=0;}
		p_track->stts_entry_count = 0;
		return 0;
	}
	else
	{
		for (i = 0; i < f->track[f->total_tracks - 1]->stts_entry_count; i++)
		{
			p_track->stts_sample_count[i] = mp4ff_read_int32(f);
			p_track->stts_sample_delta[i] = mp4ff_read_int32(f);
		}
		return 1;
	}
}

static int32_t mp4ff_read_mvhd(mp4ff_t *f)
{
    int32_t i;

    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */
    /* creation_time */ mp4ff_read_int32(f);
    /* modification_time */ mp4ff_read_int32(f);
    f->time_scale = mp4ff_read_int32(f);
    f->duration = mp4ff_read_int32(f);
    /* preferred_rate */ mp4ff_read_int32(f); /*mp4ff_read_fixed32(f);*/
    /* preferred_volume */ mp4ff_read_int16(f); /*mp4ff_read_fixed16(f);*/
    for (i = 0; i < 10; i++)
    {
        /* reserved */ mp4ff_read_char(f);
    }
    for (i = 0; i < 9; i++)
    {
        mp4ff_read_int32(f); /* matrix */
    }
    /* preview_time */ mp4ff_read_int32(f);
    /* preview_duration */ mp4ff_read_int32(f);
    /* poster_time */ mp4ff_read_int32(f);
    /* selection_time */ mp4ff_read_int32(f);
    /* selection_duration */ mp4ff_read_int32(f);
    /* current_time */ mp4ff_read_int32(f);
    /* next_track_id */ mp4ff_read_int32(f);

    return 0;
}

#if 0
static int32_t mp4ff_read_tkhd(mp4ff_t *f)
{
	uint8_t version;
	uint32_t flags;
    version = mp4ff_read_char(f); /* version */
    flags = mp4ff_read_int24(f); /* flags */
	if (version==1)
	{
		mp4ff_read_int64(f);//creation-time
		mp4ff_read_int64(f);//modification-time
		mp4ff_read_int32(f);//track-id
		mp4ff_read_int32(f);//reserved
		f->track[f->total_tracks - 1]->duration = mp4ff_read_int64(f);//duration
	}
	else //version == 0
	{
		mp4ff_read_int32(f);//creation-time
		mp4ff_read_int32(f);//modification-time
		mp4ff_read_int32(f);//track-id
		mp4ff_read_int32(f);//reserved
		f->track[f->total_tracks - 1]->duration = mp4ff_read_int32(f);//duration
		if (f->track[f->total_tracks - 1]->duration == 0xFFFFFFFF)
			f->track[f->total_tracks - 1]->duration = 0xFFFFFFFFFFFFFFFF;

	}
	mp4ff_read_int32(f);//reserved
	mp4ff_read_int32(f);//reserved
	mp4ff_read_int16(f);//layer
	mp4ff_read_int16(f);//pre-defined
	mp4ff_read_int16(f);//volume
	mp4ff_read_int16(f);//reserved
	
	//matrix
	mp4ff_read_int32(f); mp4ff_read_int32(f); mp4ff_read_int32(f);
	mp4ff_read_int32(f); mp4ff_read_int32(f); mp4ff_read_int32(f);
	mp4ff_read_int32(f); mp4ff_read_int32(f); mp4ff_read_int32(f);
	mp4ff_read_int32(f);//width
	mp4ff_read_int32(f);//height
	return 1;
}
#endif

static int32_t mp4ff_read_mdhd(mp4ff_t *f)
{
	uint32_t version;

	version = mp4ff_read_int32(f);
	if (version==1)
	{
		mp4ff_read_int64(f);//creation-time
		mp4ff_read_int64(f);//modification-time
		f->track[f->total_tracks - 1]->timeScale = mp4ff_read_int32(f);//timescale
		f->track[f->total_tracks - 1]->duration = mp4ff_read_int64(f);//duration
	}
	else //version == 0
	{
		uint32_t temp;

		mp4ff_read_int32(f);//creation-time
		mp4ff_read_int32(f);//modification-time
		f->track[f->total_tracks - 1]->timeScale = mp4ff_read_int32(f);//timescale
		temp = mp4ff_read_int32(f);
		f->track[f->total_tracks - 1]->duration = (temp == (uint32_t)(-1)) ? (uint64_t)(-1) : (uint64_t)(temp);
	}
	mp4ff_read_int16(f);
	mp4ff_read_int16(f);
	return 1;
}
#ifdef USE_TAGGING
static int32_t mp4ff_read_meta(mp4ff_t *f, const uint64_t size)
{
    uint64_t subsize, sumsize = 0;
    uint8_t atom_type;
    uint8_t header_size = 0;

    mp4ff_read_char(f); /* version */
    mp4ff_read_int24(f); /* flags */

    while (sumsize < (size-12))
    {
        subsize = mp4ff_atom_read_header(f, &atom_type, &header_size);
        if (atom_type == ATOM_ILST)
        {
            mp4ff_parse_metadata(f, (uint32_t)(subsize-(header_size+4)));
        } else {
            mp4ff_set_position(f, mp4ff_position(f)+subsize-header_size);
        }
        sumsize += subsize;
    }

    return 0;
}
#endif

int32_t mp4ff_atom_read(mp4ff_t *f, const int32_t size, const uint8_t atom_type)
{
	uint64_t dest_position = mp4ff_position(f)+size-8;
    if (atom_type == ATOM_STSZ)
    {
        /* sample size box */
        mp4ff_read_stsz(f);
    } else if (atom_type == ATOM_STTS) {
        /* time to sample box */
        mp4ff_read_stts(f);
	} else if (atom_type == ATOM_CTTS) {
		/* composition offset box */
		mp4ff_read_ctts(f);
    } else if (atom_type == ATOM_STSC) {
        /* sample to chunk box */
        mp4ff_read_stsc(f);
    } else if (atom_type == ATOM_STCO) {
        /* chunk offset box */
        mp4ff_read_stco(f);
    } else if (atom_type == ATOM_STSD) {
        /* sample description box */
        mp4ff_read_stsd(f);
    } else if (atom_type == ATOM_MVHD) {
        /* movie header box */
        mp4ff_read_mvhd(f);
    } else if (atom_type == ATOM_MDHD) {
        /* track header */
        mp4ff_read_mdhd(f);
#ifdef ITUNES_DRM
    } else if (atom_type == ATOM_FRMA) {
        /* DRM track format */
        mp4ff_read_frma(f);
    } else if (atom_type == ATOM_IVIV) {
        mp4ff_read_iviv(f, size-8);
    } else if (atom_type == ATOM_NAME) {
        mp4ff_read_name(f, size-8);
    } else if (atom_type == ATOM_PRIV) {
        mp4ff_read_priv(f, size-8);
#endif
#ifdef USE_TAGGING
    } else if (atom_type == ATOM_META) {
        /* iTunes Metadata box */
        mp4ff_read_meta(f, size);
#endif
    }
     
    mp4ff_set_position(f, dest_position);


    return 0;
}