aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/movenc.c
blob: cc809b649f707bd039863043dd12abe26ddfb719 (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
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
/*
 * MOV, 3GP, MP4 encoder.
 * Copyright (c) 2003 Thomas Raivio.
 * Copyright (c) 2004 Gildas Bazin <gbazin at videolan dot org>.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "avformat.h"
#include "avi.h"
#include "avio.h"

#undef NDEBUG
#include <assert.h>

#define MOV_INDEX_CLUSTER_SIZE 16384
#define globalTimescale 1000

#define MODE_MP4 0
#define MODE_MOV 1
#define MODE_3GP 2

typedef struct MOVIentry {
    unsigned int flags, pos, size;
    unsigned int samplesInChunk;
    char         key_frame;
    unsigned int entries;
} MOVIentry;

typedef struct MOVIndex {
    int         mode;
    int         entry;
    int         mdat_size;
    int         ents_allocated;
    long        timescale;
    long        time;
    long        trackDuration;
    long        sampleCount;
    long        sampleDuration;
    int         hasKeyframes;
    int         trackID;
    AVCodecContext *enc;

    int         vosLen;
    uint8_t     *vosData;
    MOVIentry** cluster;
} MOVTrack;

typedef struct {
    int     mode;
    long    time;
    int     nb_streams;
    int     mdat_written;
    offset_t mdat_pos;
    long    timescale;
    MOVTrack tracks[MAX_STREAMS];
} MOVContext;

static int mov_write_esds_tag(ByteIOContext *pb, MOVTrack* track);

//FIXME supprt 64bit varaint with wide placeholders
static int updateSize (ByteIOContext *pb, int pos)
{
    long curpos = url_ftell(pb);
    url_fseek(pb, pos, SEEK_SET);
    put_be32(pb, curpos - pos); /* rewrite size */
    url_fseek(pb, curpos, SEEK_SET);

    return curpos - pos;
}

/* Chunk offset atom */
static int mov_write_stco_tag(ByteIOContext *pb, MOVTrack* track)
{
    int i;
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "stco");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, track->entry); /* entry count */
    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
        put_be32(pb, track->cluster[cl][id].pos);
    }
    return updateSize (pb, pos);
}

/* Sample size atom */
static int mov_write_stsz_tag(ByteIOContext *pb, MOVTrack* track)
{
    int equalChunks = 1;
    int i, j, entries = 0, tst = -1, oldtst = -1;

    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "stsz");
    put_be32(pb, 0); /* version & flags */

    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
        tst = track->cluster[cl][id].size/track->cluster[cl][id].entries;
        if(oldtst != -1 && tst != oldtst) {
            equalChunks = 0;
        }
        oldtst = tst;
        entries += track->cluster[cl][id].entries;
    }
    if (equalChunks) {
        int sSize = track->cluster[0][0].size/track->cluster[0][0].entries;
        put_be32(pb, sSize); // sample size 
        put_be32(pb, entries); // sample count
    }
    else {
        put_be32(pb, 0); // sample size 
        put_be32(pb, entries); // sample count 
        for (i=0; i<track->entry; i++) {
            int cl = i / MOV_INDEX_CLUSTER_SIZE;
            int id = i % MOV_INDEX_CLUSTER_SIZE;
            for ( j=0; j<track->cluster[cl][id].entries; j++) {
                put_be32(pb, track->cluster[cl][id].size /
                         track->cluster[cl][id].entries);
            }
        }
    }
    return updateSize (pb, pos);
}

/* Sample to chunk atom */
static int mov_write_stsc_tag(ByteIOContext *pb, MOVTrack* track)
{
    int index = 0, oldval = -1, i, entryPos, curpos;

    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "stsc");
    put_be32(pb, 0); // version & flags 
    entryPos = url_ftell(pb);
    put_be32(pb, track->entry); // entry count 
    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
        if(oldval != track->cluster[cl][id].samplesInChunk)
        {
            put_be32(pb, i+1); // first chunk 
            put_be32(pb, track->cluster[cl][id].samplesInChunk); // samples per chunk
            put_be32(pb, 0x1); // sample description index 
            oldval = track->cluster[cl][id].samplesInChunk;
            index++;
        }
    }
    curpos = url_ftell(pb);
    url_fseek(pb, entryPos, SEEK_SET);
    put_be32(pb, index); // rewrite size 
    url_fseek(pb, curpos, SEEK_SET);

    return updateSize (pb, pos);
}

/* Sync sample atom */
static int mov_write_stss_tag(ByteIOContext *pb, MOVTrack* track)
{
    long curpos;
    int i, index = 0, entryPos;
    int pos = url_ftell(pb);
    put_be32(pb, 0); // size 
    put_tag(pb, "stss");
    put_be32(pb, 0); // version & flags 
    entryPos = url_ftell(pb);
    put_be32(pb, track->entry); // entry count 
    for (i=0; i<track->entry; i++) {
        int cl = i / MOV_INDEX_CLUSTER_SIZE;
        int id = i % MOV_INDEX_CLUSTER_SIZE;
        if(track->cluster[cl][id].key_frame == 1) {
            put_be32(pb, i+1);
            index++;
        }
    }
    curpos = url_ftell(pb);
    url_fseek(pb, entryPos, SEEK_SET);
    put_be32(pb, index); // rewrite size 
    url_fseek(pb, curpos, SEEK_SET);
    return updateSize (pb, pos);
}

static int mov_write_damr_tag(ByteIOContext *pb)
{
    put_be32(pb, 0x11); /* size */
    put_tag(pb, "damr");
    put_tag(pb, "FFMP");
    put_byte(pb, 0);

    put_be16(pb, 0x80); /* Mode set (all modes for AMR_NB) */
    put_be16(pb, 0xa); /* Mode change period (no restriction) */
    //put_be16(pb, 0x81ff); /* Mode set (all modes for AMR_NB) */
    //put_be16(pb, 1); /* Mode change period (no restriction) */
    return 0x11;
}

static int mov_write_wave_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);

    put_be32(pb, 0);     /* size */
    put_tag(pb, "wave");

    put_be32(pb, 12);    /* size */
    put_tag(pb, "frma");
    put_tag(pb, "mp4a");

    put_be32(pb, 12);    /* size */
    put_tag(pb, "mp4a");
    put_be32(pb, 0);

    mov_write_esds_tag(pb, track);

    put_be32(pb, 12);    /* size */
    put_tag(pb, "srcq");
    put_be32(pb, 0x40);

    put_be32(pb, 8);     /* size */
    put_be32(pb, 0);     /* null tag */

    return updateSize (pb, pos);
}

static int mov_write_audio_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */

    if(track->enc->codec_id == CODEC_ID_PCM_MULAW)
      put_tag(pb, "ulaw");
    else if(track->enc->codec_id == CODEC_ID_PCM_ALAW)
      put_tag(pb, "alaw");
    else if(track->enc->codec_id == CODEC_ID_ADPCM_IMA_QT)
      put_tag(pb, "ima4");
    else if(track->enc->codec_id == CODEC_ID_MACE3)
      put_tag(pb, "MAC3");
    else if(track->enc->codec_id == CODEC_ID_MACE6)
      put_tag(pb, "MAC6");
    else if(track->enc->codec_id == CODEC_ID_AAC)
      put_tag(pb, "mp4a");
    else if(track->enc->codec_id == CODEC_ID_AMR_NB)
      put_tag(pb, "samr");
    else if(track->enc->codec_id == CODEC_ID_PCM_S16BE)
      put_tag(pb, "twos");
    else if(track->enc->codec_id == CODEC_ID_PCM_S16LE)
      put_tag(pb, "sowt");
    else
      put_tag(pb, "    ");

    put_be32(pb, 0); /* Reserved */
    put_be16(pb, 0); /* Reserved */
    put_be16(pb, 1); /* Data-reference index, XXX  == 1 */

    /* SoundDescription */
    if(track->mode == MODE_MOV && track->enc->codec_id == CODEC_ID_AAC)
        put_be16(pb, 1); /* Version 1 */
    else
        put_be16(pb, 0); /* Version 0 */
    put_be16(pb, 0); /* Revision level */
    put_be32(pb, 0); /* Reserved */

    put_be16(pb, track->enc->channels); /* Number of channels */
    /* TODO: Currently hard-coded to 16-bit, there doesn't seem
                 to be a good way to get number of bits of audio */
    put_be16(pb, 0x10); /* Reserved */
    put_be16(pb, 0xfffe); /* compression ID (= 0) */
    put_be16(pb, 0xac); /* packet size (= 0) */
    put_be16(pb, track->timescale); /* Time scale */
    put_be16(pb, 0); /* Reserved */

    if(track->mode == MODE_MOV && track->enc->codec_id == CODEC_ID_AAC)
    {
        /* SoundDescription V1 extended info */
        put_be32(pb, track->enc->frame_size); /* Samples per packet  */
        put_be32(pb, 1536); /* Bytes per packet */
        put_be32(pb, 2); /* Bytes per frame */
        put_be32(pb, 2); /* Bytes per sample */
    }

    if(track->enc->codec_id == CODEC_ID_AAC) {
        if( track->mode == MODE_MOV ) mov_write_wave_tag(pb, track);
        else mov_write_esds_tag(pb, track);
    }
    if(track->enc->codec_id == CODEC_ID_AMR_NB)
        mov_write_damr_tag(pb);
    return updateSize (pb, pos);
}

static int mov_write_d263_tag(ByteIOContext *pb)
{
    put_be32(pb, 0xf); /* size */
    put_tag(pb, "d263");
    put_tag(pb, "FFMP");
    put_be16(pb, 0x0a);
    put_byte(pb, 0);
    return 0xf;
}

/* TODO: No idea about these values */
static int mov_write_svq3_tag(ByteIOContext *pb)
{
    put_be32(pb, 0x15);
    put_tag(pb, "SMI ");
    put_tag(pb, "SEQH");
    put_be32(pb, 0x5);
    put_be32(pb, 0xe2c0211d);
    put_be32(pb, 0xc0000000);
    put_byte(pb, 0);   
    return 0x15;
}

static unsigned int descrLength(unsigned int len)
{
    if (len < 0x00000080)
        return 2 + len;
    else if (len < 0x00004000)
        return 3 + len;
    else if(len < 0x00200000)
        return 4 + len;
    else
        return 5 + len;
}

static void putDescr(ByteIOContext *pb, int tag, int size)
{
    uint32_t len;
    uint8_t  vals[4];

    len = size;
    vals[3] = (uint8_t)(len & 0x7f);
    len >>= 7;
    vals[2] = (uint8_t)((len & 0x7f) | 0x80); 
    len >>= 7;
    vals[1] = (uint8_t)((len & 0x7f) | 0x80); 
    len >>= 7;
    vals[0] = (uint8_t)((len & 0x7f) | 0x80);

    put_byte(pb, tag); // DescriptorTag

    if (size < 0x00000080)
    {
        put_byte(pb, vals[3]);
    }
    else if (size < 0x00004000)
    {
        put_byte(pb, vals[2]);
        put_byte(pb, vals[3]);
    }
    else if (size < 0x00200000)
    {
        put_byte(pb, vals[1]);
        put_byte(pb, vals[2]);
        put_byte(pb, vals[3]);
    }
    else if (size < 0x10000000)
    {
        put_byte(pb, vals[0]);
        put_byte(pb, vals[1]);
        put_byte(pb, vals[2]);
        put_byte(pb, vals[3]);
    }
}

static int mov_write_esds_tag(ByteIOContext *pb, MOVTrack* track) // Basic
{
    int decoderSpecificInfoLen = track->vosLen ? descrLength(track->vosLen):0;
    int pos = url_ftell(pb);

    put_be32(pb, 0);               // size
    put_tag(pb, "esds");
    put_be32(pb, 0);               // Version

    // ES descriptor
    putDescr(pb, 0x03, 3 + descrLength(13 + decoderSpecificInfoLen) +
             descrLength(1));
    put_be16(pb, 0x0001);          // ID (= 1)
    put_byte(pb, 0x00);            // flags (= no flags)

    // DecoderConfig descriptor
    putDescr(pb, 0x04, 13 + decoderSpecificInfoLen);

    if(track->enc->codec_id == CODEC_ID_AAC)
        put_byte(pb, 0x40);        // Object type indication
    else if(track->enc->codec_id == CODEC_ID_MPEG4)
        put_byte(pb, 0x20);        // Object type indication (Visual 14496-2)

    if(track->enc->codec_type == CODEC_TYPE_AUDIO)
        put_byte(pb, 0x15);            // flags (= Audiostream)
    else
        put_byte(pb, 0x11);            // flags (= Visualstream)

    put_byte(pb, 0x0);             // Buffersize DB (24 bits)
    put_be16(pb, 0x0dd2);          // Buffersize DB

    // TODO: find real values for these
    put_be32(pb, 0x0002e918);     // maxbitrate
    put_be32(pb, 0x00017e6b);     // avg bitrate

    if (track->vosLen)
    {
        // DecoderSpecific info descriptor
        putDescr(pb, 0x05, track->vosLen);
        put_buffer(pb, track->vosData, track->vosLen);
    }

    // SL descriptor
    putDescr(pb, 0x06, 1);
    put_byte(pb, 0x02);
    return updateSize (pb, pos);
}

static int mov_write_video_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    if(track->enc->codec_id == CODEC_ID_SVQ1)
      put_tag(pb, "SVQ1");
    else if(track->enc->codec_id == CODEC_ID_SVQ3)
      put_tag(pb, "SVQ3");
    else if(track->enc->codec_id == CODEC_ID_MPEG4)
      put_tag(pb, "mp4v");
    else if(track->enc->codec_id == CODEC_ID_H263)
      put_tag(pb, "s263");
    else if(track->enc->codec_id == CODEC_ID_DVVIDEO)
      put_tag(pb, "dvc ");
    else
      put_tag(pb, "    "); /* Unknown tag */

    put_be32(pb, 0); /* Reserved */
    put_be16(pb, 0); /* Reserved */
    put_be16(pb, 1); /* Data-reference index */

    put_be32(pb, 0); /* Reserved (= 02000c) */
    put_be32(pb, 0); /* Reserved ("SVis")*/
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved (400)*/
    put_be16(pb, track->enc->width); /* Video width */
    put_be16(pb, track->enc->height); /* Video height */
    put_be32(pb, 0x00480000); /* Reserved */
    put_be32(pb, 0x00480000); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */

    put_be16(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be32(pb, 0); /* Reserved */
    put_be16(pb, 0x18); /* Reserved */
    put_be16(pb, 0xffff); /* Reserved */
    if(track->enc->codec_id == CODEC_ID_MPEG4)
        mov_write_esds_tag(pb, track);
    else if(track->enc->codec_id == CODEC_ID_H263)
        mov_write_d263_tag(pb);
    else if(track->enc->codec_id == CODEC_ID_SVQ3)
        mov_write_svq3_tag(pb);    

    return updateSize (pb, pos);
}

static int mov_write_stsd_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "stsd");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */
    if (track->enc->codec_type == CODEC_TYPE_VIDEO)
        mov_write_video_tag(pb, track);
    else if (track->enc->codec_type == CODEC_TYPE_AUDIO)
        mov_write_audio_tag(pb, track);
    return updateSize(pb, pos);
}

/* TODO?: Currently all samples/frames seem to have same duration */
/* Time to sample atom */
static int mov_write_stts_tag(ByteIOContext *pb, MOVTrack* track)
{
    put_be32(pb, 0x18); /* size */
    put_tag(pb, "stts");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */

    put_be32(pb, track->sampleCount); /* sample count */
    put_be32(pb, track->sampleDuration); /* sample duration */
    return 0x18;
}

static int mov_write_dref_tag(ByteIOContext *pb)
{
    put_be32(pb, 28); /* size */
    put_tag(pb, "dref");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */

    put_be32(pb, 0xc); /* size */
    put_tag(pb, "url ");
    put_be32(pb, 1); /* version & flags */

    return 28;
}

static int mov_write_stbl_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "stbl");
    mov_write_stsd_tag(pb, track);
    mov_write_stts_tag(pb, track);
    if (track->enc->codec_type == CODEC_TYPE_VIDEO &&
        track->hasKeyframes)
        mov_write_stss_tag(pb, track);
    mov_write_stsc_tag(pb, track);
    mov_write_stsz_tag(pb, track);
    mov_write_stco_tag(pb, track);
    return updateSize(pb, pos);
}

static int mov_write_dinf_tag(ByteIOContext *pb)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "dinf");
    mov_write_dref_tag(pb);
    return updateSize(pb, pos);
}

static int mov_write_smhd_tag(ByteIOContext *pb)
{
    put_be32(pb, 16); /* size */
    put_tag(pb, "smhd");
    put_be32(pb, 0); /* version & flags */
    put_be16(pb, 0); /* reserved (balance, normally = 0) */
    put_be16(pb, 0); /* reserved */
    return 16;
}

static int mov_write_vmhd_tag(ByteIOContext *pb)
{
    put_be32(pb, 0x14); /* size (always 0x14) */
    put_tag(pb, "vmhd");
    put_be32(pb, 0x01); /* version & flags */
    put_be64(pb, 0); /* reserved (graphics mode = copy) */
    return 0x14;
}

static int mov_write_minf_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "minf");
    if(track->enc->codec_type == CODEC_TYPE_VIDEO)
        mov_write_vmhd_tag(pb);
    else
        mov_write_smhd_tag(pb);
    mov_write_dinf_tag(pb);
    mov_write_stbl_tag(pb, track);
    return updateSize(pb, pos);
}

static int mov_write_hdlr_tag(ByteIOContext *pb, MOVTrack* track)
{
    char *str;
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "hdlr");
    put_be32(pb, 0); /* Version & flags */
    if (track->mode == MODE_MOV)
        put_tag(pb, "mhlr"); /* handler */
    else
	put_be32(pb, 0); /* reserved */
    if(track->enc->codec_type == CODEC_TYPE_VIDEO)
        put_tag(pb, "vide"); /* handler type */
    else
        put_tag(pb, "soun"); /* handler type */
    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
    if(track->enc->codec_type == CODEC_TYPE_VIDEO)
        str = "VideoHandler";
    else
        str = "SoundHandler";
    put_byte(pb, strlen(str)); /* string counter */
    put_buffer(pb, str, strlen(str));
    return updateSize(pb, pos);
}

static int mov_write_mdhd_tag(ByteIOContext *pb, MOVTrack* track)
{
    put_be32(pb, 32); /* size */
    put_tag(pb, "mdhd");
    put_be32(pb, 0); /* Version & flags */
    put_be32(pb, track->time); /* creation time */
    put_be32(pb, track->time); /* modification time */
    put_be32(pb, track->timescale); /* time scale (sample rate for audio) */ 
    put_be32(pb, track->trackDuration); /* duration */
    put_be16(pb, 0); /* language, 0 = english */
    put_be16(pb, 0); /* reserved (quality) */
    return 32;
}

static int mov_write_mdia_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "mdia");
    mov_write_mdhd_tag(pb, track);
    mov_write_hdlr_tag(pb, track);
    mov_write_minf_tag(pb, track);
    return updateSize(pb, pos);
}

static int mov_write_tkhd_tag(ByteIOContext *pb, MOVTrack* track)
{
    int64_t maxTrackLenTemp;
    put_be32(pb, 0x5c); /* size (always 0x5c) */
    put_tag(pb, "tkhd");
    put_be32(pb, 0xf); /* version & flags (track enabled) */
    put_be32(pb, track->time); /* creation time */
    put_be32(pb, track->time); /* modification time */
    put_be32(pb, track->trackID); /* track-id */
    put_be32(pb, 0); /* reserved */
    maxTrackLenTemp = ((int64_t)globalTimescale*(int64_t)track->trackDuration)/(int64_t)track->timescale;
    put_be32(pb, (long)maxTrackLenTemp); /* duration */

    put_be32(pb, 0); /* reserved */
    put_be32(pb, 0); /* reserved */
    put_be32(pb, 0x0); /* reserved (Layer & Alternate group) */
    /* Volume, only for audio */
    if(track->enc->codec_type == CODEC_TYPE_AUDIO)
        put_be16(pb, 0x0100);
    else
        put_be16(pb, 0);
    put_be16(pb, 0); /* reserved */

    /* Matrix structure */
    put_be32(pb, 0x00010000); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x00010000); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x40000000); /* reserved */

    /* Track width and height, for visual only */
    if(track->enc->codec_type == CODEC_TYPE_VIDEO) {
        double sample_aspect_ratio = av_q2d(track->enc->sample_aspect_ratio);
        if( !sample_aspect_ratio ) sample_aspect_ratio = 1;
        put_be32(pb, sample_aspect_ratio * track->enc->width*0x10000);
        put_be32(pb, track->enc->height*0x10000);
    }
    else {
        put_be32(pb, 0);
        put_be32(pb, 0);
    }
    return 0x5c;
}

static int mov_write_trak_tag(ByteIOContext *pb, MOVTrack* track)
{
    int pos = url_ftell(pb);
    put_be32(pb, 0); /* size */
    put_tag(pb, "trak");
    mov_write_tkhd_tag(pb, track);
    mov_write_mdia_tag(pb, track);
    return updateSize(pb, pos);
}

/* TODO: Not sorted out, but not necessary either */
static int mov_write_iods_tag(ByteIOContext *pb, MOVContext *mov)
{
    put_be32(pb, 0x15); /* size */
    put_tag(pb, "iods");
    put_be32(pb, 0);    /* version & flags */
    put_be16(pb, 0x1007);
    put_byte(pb, 0);
    put_be16(pb, 0x4fff);
    put_be16(pb, 0xfffe);
    put_be16(pb, 0x01ff);
    return 0x15;
}

static int mov_write_mvhd_tag(ByteIOContext *pb, MOVContext *mov)
{
    int maxTrackID = 1, maxTrackLen = 0, i;
    int64_t maxTrackLenTemp;

    put_be32(pb, 0x6c); /* size (always 0x6c) */
    put_tag(pb, "mvhd");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, mov->time); /* creation time */
    put_be32(pb, mov->time); /* modification time */
    put_be32(pb, mov->timescale); /* timescale */
    for (i=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].entry > 0) {
            maxTrackLenTemp = ((int64_t)globalTimescale*(int64_t)mov->tracks[i].trackDuration)/(int64_t)mov->tracks[i].timescale;
            if(maxTrackLen < maxTrackLenTemp)
                maxTrackLen = maxTrackLenTemp;
            if(maxTrackID < mov->tracks[i].trackID)
                maxTrackID = mov->tracks[i].trackID;
        }
    }
    put_be32(pb, maxTrackLen); /* duration of longest track */

    put_be32(pb, 0x00010000); /* reserved (preferred rate) 1.0 = normal */
    put_be16(pb, 0x0100); /* reserved (preferred volume) 1.0 = normal */
    put_be16(pb, 0); /* reserved */
    put_be32(pb, 0); /* reserved */
    put_be32(pb, 0); /* reserved */

    /* Matrix structure */
    put_be32(pb, 0x00010000); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x00010000); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x0); /* reserved */
    put_be32(pb, 0x40000000); /* reserved */

    put_be32(pb, 0); /* reserved (preview time) */
    put_be32(pb, 0); /* reserved (preview duration) */
    put_be32(pb, 0); /* reserved (poster time) */
    put_be32(pb, 0); /* reserved (selection time) */
    put_be32(pb, 0); /* reserved (selection duration) */
    put_be32(pb, 0); /* reserved (current time) */
    put_be32(pb, maxTrackID+1); /* Next track id */
    return 0x6c;
}

static int mov_write_udta_tag(ByteIOContext *pb, MOVContext* mov,
                              AVFormatContext *s)
{
    int pos = url_ftell(pb);
    int i;

    put_be32(pb, 0); /* size */
    put_tag(pb, "udta");

    /* Requirements */
    for (i=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].entry <= 0) continue;
        if (mov->tracks[i].enc->codec_id == CODEC_ID_AAC ||
            mov->tracks[i].enc->codec_id == CODEC_ID_MPEG4) {
            int pos = url_ftell(pb);
            put_be32(pb, 0); /* size */
            put_tag(pb, "\251req");
            put_be16(pb, sizeof("QuickTime 6.0 or greater") - 1);
            put_be16(pb, 0);
            put_buffer(pb, "QuickTime 6.0 or greater",
                       sizeof("QuickTime 6.0 or greater") - 1);
            updateSize(pb, pos);
            break;
        }
    }

    /* Encoder */
    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251enc");
        put_be16(pb, sizeof(LIBAVFORMAT_IDENT) - 1); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, LIBAVFORMAT_IDENT, sizeof(LIBAVFORMAT_IDENT) - 1);
        updateSize(pb, pos);
    }

    if( s->title[0] )
    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251nam");
        put_be16(pb, strlen(s->title)); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, s->title, strlen(s->title));
        updateSize(pb, pos);
    }

    if( s->author[0] )
    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, /*"\251aut"*/ "\251day" );
        put_be16(pb, strlen(s->author)); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, s->author, strlen(s->author));
        updateSize(pb, pos);
    }

    if( s->comment[0] )
    {
        int pos = url_ftell(pb);
        put_be32(pb, 0); /* size */
        put_tag(pb, "\251des");
        put_be16(pb, strlen(s->comment)); /* string length */
        put_be16(pb, 0);
        put_buffer(pb, s->comment, strlen(s->comment));
        updateSize(pb, pos);
    }

    return updateSize(pb, pos);
}

static int mov_write_moov_tag(ByteIOContext *pb, MOVContext *mov,
                              AVFormatContext *s)
{
    int pos, i;
    pos = url_ftell(pb);
    put_be32(pb, 0); /* size placeholder*/
    put_tag(pb, "moov");
    mov->timescale = globalTimescale;

    for (i=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].entry <= 0) continue;

        if(mov->tracks[i].enc->codec_type == CODEC_TYPE_VIDEO) {
            mov->tracks[i].timescale = mov->tracks[i].enc->frame_rate;
            mov->tracks[i].sampleDuration = mov->tracks[i].enc->frame_rate_base;
        }
        else if(mov->tracks[i].enc->codec_type == CODEC_TYPE_AUDIO) {
            /* If AMR, track timescale = 8000, AMR_WB = 16000 */
            if(mov->tracks[i].enc->codec_id == CODEC_ID_AMR_NB) {
                mov->tracks[i].sampleDuration = 160;  // Bytes per chunk
                mov->tracks[i].timescale = 8000;
            }
            else {
                mov->tracks[i].timescale = mov->tracks[i].enc->sample_rate;
                mov->tracks[i].sampleDuration = mov->tracks[i].enc->frame_size;
            }
        }

        mov->tracks[i].trackDuration = 
            mov->tracks[i].sampleCount * mov->tracks[i].sampleDuration;
        mov->tracks[i].time = mov->time;
        mov->tracks[i].trackID = i+1;
    }

    mov_write_mvhd_tag(pb, mov);
    //mov_write_iods_tag(pb, mov);
    for (i=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].entry > 0) {
            mov_write_trak_tag(pb, &(mov->tracks[i]));
        }
    }

    mov_write_udta_tag(pb, mov, s);

    return updateSize(pb, pos);
}

int mov_write_mdat_tag(ByteIOContext *pb, MOVContext* mov)
{
    mov->mdat_pos = url_ftell(pb); 
    put_be32(pb, 0); /* size placeholder*/
    put_tag(pb, "mdat");
    return 0;
}

/* TODO: This needs to be more general */
int mov_write_ftyp_tag(ByteIOContext *pb, AVFormatContext *s)
{
    MOVContext *mov = s->priv_data;

    put_be32(pb, 0x14 ); /* size */
    put_tag(pb, "ftyp");

    if ( mov->mode == MODE_3GP )
        put_tag(pb, "3gp4");
    else
        put_tag(pb, "isom");

    put_be32(pb, 0x200 );

    if ( mov->mode == MODE_3GP )
        put_tag(pb, "3gp4");
    else
        put_tag(pb, "mp41");

    return 0x14;
}

static int mov_write_header(AVFormatContext *s)
{
    ByteIOContext *pb = &s->pb;
    MOVContext *mov = s->priv_data;
    int i;

    /* Default mode == MP4 */
    mov->mode = MODE_MP4;

    if (s->oformat != NULL) {
        if (!strcmp("3gp", s->oformat->name)) mov->mode = MODE_3GP;
        else if (!strcmp("mov", s->oformat->name)) mov->mode = MODE_MOV;

        if ( mov->mode == MODE_3GP || mov->mode == MODE_MP4 )
            mov_write_ftyp_tag(pb,s);
    }

    for (i=0; i<MAX_STREAMS; i++) {
        mov->tracks[i].mode = mov->mode;
    }

    put_flush_packet(pb);

    return 0;
}

static int Timestamp(void) {
    return 1067949799U+(24107*86400); //its the modification time of this line :)
}

static int mov_write_packet(AVFormatContext *s, int stream_index,
                            const uint8_t *buf, int size, int64_t pts)
{
    MOVContext *mov = s->priv_data;
    ByteIOContext *pb = &s->pb;
    AVCodecContext *enc = &s->streams[stream_index]->codec;
    MOVTrack* trk = &mov->tracks[stream_index];
    int cl, id;
    unsigned int samplesInChunk = 0;

    if (url_is_streamed(&s->pb)) return 0; /* Can't handle that */
    if (!size) return 0; /* Discard 0 sized packets */

    if (enc->codec_type == CODEC_TYPE_VIDEO ) {
        samplesInChunk = 1;
    }
    else if (enc->codec_type == CODEC_TYPE_AUDIO ) {
        if( enc->codec_id == CODEC_ID_AMR_NB) {
            /* We must find out how many AMR blocks there are in one packet */
            static uint16_t packed_size[16] =
                {13, 14, 16, 18, 20, 21, 27, 32, 6, 0, 0, 0, 0, 0, 0, 0};
            int len = 0;

            while (len < size && samplesInChunk < 100) {
                len += packed_size[(buf[len] >> 3) & 0x0F];
                samplesInChunk++;
            }
        }
        else if(enc->codec_id == CODEC_ID_PCM_ALAW) {
            samplesInChunk = size/enc->channels;
        }
        else {
            samplesInChunk = 1;
        }
    }

    if ((enc->codec_id == CODEC_ID_MPEG4 || enc->codec_id == CODEC_ID_AAC)
        && trk->vosLen == 0) {
        assert(enc->extradata_size);

        trk->vosLen = enc->extradata_size;
        trk->vosData = av_malloc(trk->vosLen);
        memcpy(trk->vosData, enc->extradata, trk->vosLen);
    }

    cl = trk->entry / MOV_INDEX_CLUSTER_SIZE;
    id = trk->entry % MOV_INDEX_CLUSTER_SIZE;

    if (trk->ents_allocated <= trk->entry) {
        trk->cluster = av_realloc(trk->cluster, (cl+1)*sizeof(void*)); 
        if (!trk->cluster)
            return -1;
        trk->cluster[cl] = av_malloc(MOV_INDEX_CLUSTER_SIZE*sizeof(MOVIentry));
        if (!trk->cluster[cl])
            return -1;
        trk->ents_allocated += MOV_INDEX_CLUSTER_SIZE;
    }
    if (mov->mdat_written == 0) {
        mov_write_mdat_tag(pb, mov);
        mov->mdat_written = 1;
        mov->time = Timestamp();
    }

    trk->cluster[cl][id].pos = url_ftell(pb);
    trk->cluster[cl][id].samplesInChunk = samplesInChunk;
    trk->cluster[cl][id].size = size;
    trk->cluster[cl][id].entries = samplesInChunk;
    if(enc->codec_type == CODEC_TYPE_VIDEO) {
        trk->cluster[cl][id].key_frame = enc->coded_frame->key_frame;
        if(enc->coded_frame->pict_type == FF_I_TYPE)
            trk->hasKeyframes = 1;
    }
    trk->enc = enc;
    trk->entry++;
    trk->sampleCount += samplesInChunk;
    trk->mdat_size += size;

    put_buffer(pb, buf, size);

    put_flush_packet(pb);
    return 0;
}

static int mov_write_trailer(AVFormatContext *s)
{
    MOVContext *mov = s->priv_data;
    ByteIOContext *pb = &s->pb;
    int res = 0;
    int i, j;

    offset_t moov_pos = url_ftell(pb);

    /* Write size of mdat tag */
    for (i=0, j=0; i<MAX_STREAMS; i++) {
        if(mov->tracks[i].ents_allocated > 0) {
            j += mov->tracks[i].mdat_size;
        }
    }
    url_fseek(pb, mov->mdat_pos, SEEK_SET);
    put_be32(pb, j+8);
    url_fseek(pb, moov_pos, SEEK_SET);

    mov_write_moov_tag(pb, mov, s);

    for (i=0; i<MAX_STREAMS; i++) {
        for (j=0; j<mov->tracks[i].ents_allocated/MOV_INDEX_CLUSTER_SIZE; j++) {
            av_free(mov->tracks[i].cluster[j]);
        }
        av_free(mov->tracks[i].cluster);
        if( mov->tracks[i].vosLen ) av_free( mov->tracks[i].vosData );

        mov->tracks[i].cluster = NULL;
        mov->tracks[i].ents_allocated = mov->tracks[i].entry = 0;
    }

    put_flush_packet(pb);

    return res;
}

static AVOutputFormat mov_oformat = {
    "mov",
    "mov format",
    NULL,
    "mov",
    sizeof(MOVContext),
    CODEC_ID_AAC,
    CODEC_ID_MPEG4,
    mov_write_header,
    mov_write_packet,
    mov_write_trailer,
};

static AVOutputFormat _3gp_oformat = {
    "3gp",
    "3gp format",
    NULL,
    "3gp",
    sizeof(MOVContext),
    CODEC_ID_AMR_NB,
    CODEC_ID_H263,
    mov_write_header,
    mov_write_packet,
    mov_write_trailer,
};

static AVOutputFormat mp4_oformat = {
    "mp4",
    "mp4 format",
    "application/mp4",
    "mp4,m4a",
    sizeof(MOVContext),
    CODEC_ID_AAC,
    CODEC_ID_MPEG4,
    mov_write_header,
    mov_write_packet,
    mov_write_trailer,
};

int movenc_init(void)
{
    av_register_output_format(&mov_oformat);
    av_register_output_format(&_3gp_oformat);
    av_register_output_format(&mp4_oformat);
    return 0;
}