summaryrefslogtreecommitdiffstats
path: root/libavformat/mxfenc.c
blob: ab8f36b487df6cf666ace31e0e3a0a726c5b3a9e (plain)
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
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
/*
 * MXF muxer
 * Copyright (c) 2008 GUCAS, Zhentan Feng <spyfeng at gmail dot com>
 * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/*
 * References
 * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
 * SMPTE 377M MXF File Format Specifications
 * SMPTE 379M MXF Generic Container
 * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
 * SMPTE RP210: SMPTE Metadata Dictionary
 * SMPTE RP224: Registry of SMPTE Universal Labels
 */

//#define DEBUG

#include <math.h>
#include <time.h>

#include "libavutil/fifo.h"
#include "libavutil/random_seed.h"
#include "libavcodec/bytestream.h"
#include "audiointerleave.h"
#include "avformat.h"
#include "mxf.h"

static const int NTSC_samples_per_frame[] = { 1602, 1601, 1602, 1601, 1602, 0 };
static const int PAL_samples_per_frame[]  = { 1920, 0 };

AVOutputFormat mxf_d10_muxer;

#define EDIT_UNITS_PER_BODY 250
#define KAG_SIZE 512

typedef struct {
    int local_tag;
    UID uid;
} MXFLocalTagPair;

typedef struct {
    uint8_t flags;
    uint64_t offset;
    unsigned slice_offset; ///< offset of audio slice
} MXFIndexEntry;

typedef struct {
    AudioInterleaveContext aic;
    UID track_essence_element_key;
    int index;            ///< index in mxf_essence_container_uls table
    const UID *codec_ul;
    int order;            ///< interleaving order if dts are equal
    int interlaced;       ///< wether picture is interlaced
    int temporal_reordering;
    AVRational aspect_ratio; ///< display aspect ratio
} MXFStreamContext;

typedef struct {
    UID container_ul;
    UID element_ul;
    UID codec_ul;
    void (*write_desc)();
} MXFContainerEssenceEntry;

static const struct {
    enum CodecID id;
    int index;
} mxf_essence_mappings[] = {
    { CODEC_ID_MPEG2VIDEO, 0 },
    { CODEC_ID_PCM_S24LE,  1 },
    { CODEC_ID_PCM_S16LE,  1 },
    { 0 }
};

static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st);
static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st);
static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st);
static void mxf_write_cdci_desc(AVFormatContext *s, AVStream *st);
static void mxf_write_generic_sound_desc(AVFormatContext *s, AVStream *st);

static const MXFContainerEssenceEntry mxf_essence_container_uls[] = {
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x15,0x01,0x05,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x00,0x00,0x00 },
      mxf_write_mpegvideo_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x03,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_aes3_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x16,0x01,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_wav_desc },
    // D-10 625/50 PAL 50mb/s
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 },
      mxf_write_cdci_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_generic_sound_desc },
    // D-10 525/60 NTSC 50mb/s
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x02,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x02 },
      mxf_write_cdci_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x02,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_generic_sound_desc },
    // D-10 625/50 PAL 40mb/s
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x03,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x03 },
      mxf_write_cdci_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x03,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_generic_sound_desc },
    // D-10 525/60 NTSC 40mb/s
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x04,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x04 },
      mxf_write_cdci_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x04,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_generic_sound_desc },
    // D-10 625/50 PAL 30mb/s
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 },
      mxf_write_cdci_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_generic_sound_desc },
    // D-10 525/60 NTSC 30mb/s
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x06,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x05,0x01,0x01,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x06 },
      mxf_write_cdci_desc },
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x06,0x01 },
      { 0x06,0x0E,0x2B,0x34,0x01,0x02,0x01,0x01,0x0D,0x01,0x03,0x01,0x06,0x01,0x10,0x00 },
      { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },
      mxf_write_generic_sound_desc },
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
      { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
      { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
      NULL },
};

typedef struct MXFContext {
    int64_t footer_partition_offset;
    int essence_container_count;
    AVRational time_base;
    int header_written;
    MXFIndexEntry *index_entries;
    unsigned edit_units_count;
    uint64_t timestamp;   ///< timestamp, as year(16),month(8),day(8),hour(8),minutes(8),msec/4(8)
    uint8_t slice_count;  ///< index slice count minus 1 (1 if no audio, 0 otherwise)
    int last_indexed_edit_unit;
    uint64_t *body_partition_offset;
    unsigned body_partitions_count;
    int last_key_index;  ///< index of last key frame
    uint64_t duration;
    AVStream *timecode_track;
    int timecode_base;       ///< rounded time code base (25 or 30)
    int timecode_start;      ///< frame number computed from mpeg-2 gop header timecode
    int timecode_drop_frame; ///< time code use drop frame method frop mpeg-2 essence gop header
    int edit_unit_byte_count; ///< fixed edit unit byte count
    uint64_t body_offset;
    uint32_t instance_number;
    uint8_t umid[16];        ///< unique material identifier
} MXFContext;

static const uint8_t uuid_base[]            = { 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
static const uint8_t umid_ul[]              = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13 };

/**
 * complete key for operation pattern, partitions, and primer pack
 */
static const uint8_t op1a_ul[]                     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x09,0x00 };
static const uint8_t footer_partition_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }; // ClosedComplete
static const uint8_t primer_pack_key[]             = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x05,0x01,0x00 };
static const uint8_t index_table_segment_key[]     = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 };
static const uint8_t random_index_pack_key[]       = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x11,0x01,0x00 };
static const uint8_t header_open_partition_key[]   = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }; // OpenIncomplete
static const uint8_t header_closed_partition_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }; // ClosedComplete
static const uint8_t klv_fill_key[]                = { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x03,0x01,0x02,0x10,0x01,0x00,0x00,0x00 };
static const uint8_t body_partition_key[]          = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }; // ClosedComplete

/**
 * partial key for header metadata
 */
static const uint8_t header_metadata_key[]  = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01 };
static const uint8_t multiple_desc_ul[]     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x0D,0x01,0x03,0x01,0x02,0x7F,0x01,0x00 };

/**
 * SMPTE RP210 http://www.smpte-ra.org/mdd/index.html
 */
static const MXFLocalTagPair mxf_local_tag_batch[] = {
    // preface set
    { 0x3C0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x02,0x00,0x00,0x00,0x00}}, /* Instance UID */
    { 0x3B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x04,0x00,0x00}}, /* Last Modified Date */
    { 0x3B05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x03,0x01,0x02,0x01,0x05,0x00,0x00,0x00}}, /* Version */
    { 0x3B06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x04,0x00,0x00}}, /* Identifications reference */
    { 0x3B03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x01,0x00,0x00}}, /* Content Storage reference */
    { 0x3B09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x03,0x00,0x00,0x00,0x00}}, /* Operational Pattern UL */
    { 0x3B0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x01,0x00,0x00}}, /* Essence Containers UL batch */
    { 0x3B0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x02,0x02,0x10,0x02,0x02,0x00,0x00}}, /* DM Schemes UL batch */
    // Identification
    { 0x3C09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x01,0x00,0x00,0x00}}, /* This Generation UID */
    { 0x3C01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x02,0x01,0x00,0x00}}, /* Company Name */
    { 0x3C02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x03,0x01,0x00,0x00}}, /* Product Name */
    { 0x3C04, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x05,0x01,0x00,0x00}}, /* Version String */
    { 0x3C05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x20,0x07,0x01,0x07,0x00,0x00,0x00}}, /* Product ID */
    { 0x3C06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x03,0x00,0x00}}, /* Modification Date */
    // Content Storage
    { 0x1901, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x01,0x00,0x00}}, /* Package strong reference batch */
    { 0x1902, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x05,0x02,0x00,0x00}}, /* Package strong reference batch */
    // Essence Container Data
    { 0x2701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x06,0x01,0x00,0x00,0x00}}, /* Linked Package UID */
    { 0x3F07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x04,0x00,0x00,0x00,0x00}}, /* BodySID */
    // Package
    { 0x4401, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x01,0x01,0x15,0x10,0x00,0x00,0x00,0x00}}, /* Package UID */
    { 0x4405, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x01,0x03,0x00,0x00}}, /* Package Creation Date */
    { 0x4404, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x10,0x02,0x05,0x00,0x00}}, /* Package Modified Date */
    { 0x4403, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x05,0x00,0x00}}, /* Tracks Strong reference array */
    { 0x4701, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x03,0x00,0x00}}, /* Descriptor */
    // Track
    { 0x4801, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00}}, /* Track ID */
    { 0x4804, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x01,0x04,0x01,0x03,0x00,0x00,0x00,0x00}}, /* Track Number */
    { 0x4B01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x05,0x30,0x04,0x05,0x00,0x00,0x00,0x00}}, /* Edit Rate */
    { 0x4B02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x03,0x00,0x00}}, /* Origin */
    { 0x4803, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x02,0x04,0x00,0x00}}, /* Sequence reference */
    // Sequence
    { 0x0201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x07,0x01,0x00,0x00,0x00,0x00,0x00}}, /* Data Definition UL */
    { 0x0202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x02,0x01,0x01,0x03,0x00,0x00}}, /* Duration */
    { 0x1001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x06,0x09,0x00,0x00}}, /* Structural Components reference array */
    // Source Clip
    { 0x1201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x04,0x00,0x00}}, /* Start position */
    { 0x1101, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x01,0x00,0x00,0x00}}, /* SourcePackageID */
    { 0x1102, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x03,0x02,0x00,0x00,0x00}}, /* SourceTrackID */
    // Timecode Component
    { 0x1501, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x07,0x02,0x01,0x03,0x01,0x05,0x00,0x00}}, /* Start Time Code */
    { 0x1502, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x04,0x01,0x01,0x02,0x06,0x00,0x00}}, /* Rounded Time Code Base */
    { 0x1503, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x04,0x01,0x01,0x05,0x00,0x00,0x00}}, /* Drop Frame */
    // File Descriptor
    { 0x3F01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x04,0x06,0x0B,0x00,0x00}}, /* Sub Descriptors reference array */
    { 0x3006, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x06,0x01,0x01,0x03,0x05,0x00,0x00,0x00}}, /* Linked Track ID */
    { 0x3001, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x06,0x01,0x01,0x00,0x00,0x00,0x00}}, /* SampleRate */
    { 0x3004, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x06,0x01,0x01,0x04,0x01,0x02,0x00,0x00}}, /* Essence Container */
    // Generic Picture Essence Descriptor
    { 0x320C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Frame Layout */
    { 0x320D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x03,0x02,0x05,0x00,0x00,0x00}}, /* Video Line Map */
    { 0x3203, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x02,0x00,0x00,0x00}}, /* Stored Width */
    { 0x3202, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x02,0x01,0x00,0x00,0x00}}, /* Stored Height */
    { 0x3209, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0C,0x00,0x00,0x00}}, /* Display Width */
    { 0x3208, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0B,0x00,0x00,0x00}}, /* Display Height */
    { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */
    { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */
    // CDCI Picture Essence Descriptor
    { 0x3301, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x05,0x03,0x0A,0x00,0x00,0x00}}, /* Component Depth */
    { 0x3302, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x05,0x00,0x00,0x00}}, /* Horizontal Subsampling */
    // Generic Sound Essence Descriptor
    { 0x3D02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Locked/Unlocked */
    { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */
    { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */
    { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */
    { 0x3D06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x02,0x04,0x02,0x00,0x00,0x00,0x00}}, /* Sound Essence Compression */
    // Index Table Segment
    { 0x3F0B, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x05,0x30,0x04,0x06,0x00,0x00,0x00,0x00}}, /* Index Edit Rate */
    { 0x3F0C, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x01,0x03,0x01,0x0A,0x00,0x00}}, /* Index Start Position */
    { 0x3F0D, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x07,0x02,0x02,0x01,0x01,0x02,0x00,0x00}}, /* Index Duration */
    { 0x3F05, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x06,0x02,0x01,0x00,0x00,0x00,0x00}}, /* Edit Unit Byte Count */
    { 0x3F06, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x01,0x03,0x04,0x05,0x00,0x00,0x00,0x00}}, /* IndexSID */
    { 0x3F08, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x04,0x04,0x01,0x01,0x00,0x00,0x00}}, /* Slice Count */
    { 0x3F09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x01,0x06,0x00,0x00,0x00}}, /* Delta Entry Array */
    { 0x3F0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x04,0x04,0x02,0x05,0x00,0x00,0x00}}, /* Index Entry Array */
    // MPEG video Descriptor
    { 0x8000, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x01,0x06,0x02,0x01,0x0B,0x00,0x00}}, /* BitRate */
    // Wave Audio Essence Descriptor
    { 0x3D09, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x03,0x05,0x00,0x00,0x00}}, /* Average Bytes Per Second */
    { 0x3D0A, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x02,0x01,0x00,0x00,0x00}}, /* Block Align */
};

static void mxf_write_uuid(ByteIOContext *pb, enum MXFMetadataSetType type, int value)
{
    put_buffer(pb, uuid_base, 12);
    put_be16(pb, type);
    put_be16(pb, value);
}

static void mxf_write_umid(AVFormatContext *s, int type)
{
    MXFContext *mxf = s->priv_data;
    put_buffer(s->pb, umid_ul, 13);
    put_be24(s->pb, mxf->instance_number);
    put_buffer(s->pb, mxf->umid, 15);
    put_byte(s->pb, type);
}

static void mxf_write_refs_count(ByteIOContext *pb, int ref_count)
{
    put_be32(pb, ref_count);
    put_be32(pb, 16);
}

static int klv_ber_length(uint64_t len)
{
    if (len < 128)
        return 1;
    else
        return (av_log2(len) >> 3) + 2;
}

static int klv_encode_ber_length(ByteIOContext *pb, uint64_t len)
{
    // Determine the best BER size
    int size;
    if (len < 128) {
        //short form
        put_byte(pb, len);
        return 1;
    }

    size = (av_log2(len) >> 3) + 1;

    // long form
    put_byte(pb, 0x80 + size);
    while(size) {
        size--;
        put_byte(pb, len >> 8 * size & 0xff);
    }
    return 0;
}

static void klv_encode_ber4_length(ByteIOContext *pb, int len)
{
    put_byte(pb, 0x80 + 3);
    put_be24(pb, len);
}

/*
 * Get essence container ul index
 */
static int mxf_get_essence_container_ul_index(enum CodecID id)
{
    int i;
    for (i = 0; mxf_essence_mappings[i].id; i++)
        if (mxf_essence_mappings[i].id == id)
            return mxf_essence_mappings[i].index;
    return -1;
}

static void mxf_write_primer_pack(AVFormatContext *s)
{
    ByteIOContext *pb = s->pb;
    int local_tag_number, i = 0;

    local_tag_number = FF_ARRAY_ELEMS(mxf_local_tag_batch);

    put_buffer(pb, primer_pack_key, 16);
    klv_encode_ber_length(pb, local_tag_number * 18 + 8);

    put_be32(pb, local_tag_number); // local_tag num
    put_be32(pb, 18); // item size, always 18 according to the specs

    for (i = 0; i < local_tag_number; i++) {
        put_be16(pb, mxf_local_tag_batch[i].local_tag);
        put_buffer(pb, mxf_local_tag_batch[i].uid, 16);
    }
}

static void mxf_write_local_tag(ByteIOContext *pb, int size, int tag)
{
    put_be16(pb, tag);
    put_be16(pb, size);
}

static void mxf_write_metadata_key(ByteIOContext *pb, unsigned int value)
{
    put_buffer(pb, header_metadata_key, 13);
    put_be24(pb, value);
}

static void mxf_free(AVFormatContext *s)
{
    int i;

    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        av_freep(&st->priv_data);
    }
}

static const MXFCodecUL *mxf_get_data_definition_ul(int type)
{
    const MXFCodecUL *uls = ff_mxf_data_definition_uls;
    while (uls->uid[0]) {
        if (type == uls->id)
            break;
        uls++;
    }
    return uls;
}

static void mxf_write_essence_container_refs(AVFormatContext *s)
{
    MXFContext *c = s->priv_data;
    ByteIOContext *pb = s->pb;
    int i;

    mxf_write_refs_count(pb, c->essence_container_count);
    av_log(s,AV_LOG_DEBUG, "essence container count:%d\n", c->essence_container_count);
    for (i = 0; i < c->essence_container_count; i++) {
        MXFStreamContext *sc = s->streams[i]->priv_data;
        put_buffer(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
    }
}

static void mxf_write_preface(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;

    mxf_write_metadata_key(pb, 0x012f00);
    PRINT_KEY(s, "preface key", pb->buf_ptr - 16);
    klv_encode_ber_length(pb, 130 + 16 * mxf->essence_container_count);

    // write preface set uid
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, Preface, 0);
    PRINT_KEY(s, "preface uid", pb->buf_ptr - 16);

    // last modified date
    mxf_write_local_tag(pb, 8, 0x3B02);
    put_be64(pb, mxf->timestamp);

    // write version
    mxf_write_local_tag(pb, 2, 0x3B05);
    put_be16(pb, 258); // v1.2

    // write identification_refs
    mxf_write_local_tag(pb, 16 + 8, 0x3B06);
    mxf_write_refs_count(pb, 1);
    mxf_write_uuid(pb, Identification, 0);

    // write content_storage_refs
    mxf_write_local_tag(pb, 16, 0x3B03);
    mxf_write_uuid(pb, ContentStorage, 0);

    // operational pattern
    mxf_write_local_tag(pb, 16, 0x3B09);
    put_buffer(pb, op1a_ul, 16);

    // write essence_container_refs
    mxf_write_local_tag(pb, 8 + 16 * mxf->essence_container_count, 0x3B0A);
    mxf_write_essence_container_refs(s);

    // write dm_scheme_refs
    mxf_write_local_tag(pb, 8, 0x3B0B);
    put_be64(pb, 0);
}

/*
 * Write a local tag containing an ascii string as utf-16
 */
static void mxf_write_local_tag_utf16(ByteIOContext *pb, int tag, const char *value)
{
    int i, size = strlen(value);
    mxf_write_local_tag(pb, size*2, tag);
    for (i = 0; i < size; i++)
        put_be16(pb, value[i]);
}

static void mxf_write_identification(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    const char *company = "FFmpeg";
    const char *product = "OP1a Muxer";
    const char *version;
    int length;

    mxf_write_metadata_key(pb, 0x013000);
    PRINT_KEY(s, "identification key", pb->buf_ptr - 16);

    version = s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT ?
        "0.0.0" : AV_STRINGIFY(LIBAVFORMAT_VERSION);
    length = 84 + (strlen(company)+strlen(product)+strlen(version))*2; // utf-16
    klv_encode_ber_length(pb, length);

    // write uid
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, Identification, 0);
    PRINT_KEY(s, "identification uid", pb->buf_ptr - 16);

    // write generation uid
    mxf_write_local_tag(pb, 16, 0x3C09);
    mxf_write_uuid(pb, Identification, 1);

    mxf_write_local_tag_utf16(pb, 0x3C01, company); // Company Name
    mxf_write_local_tag_utf16(pb, 0x3C02, product); // Product Name
    mxf_write_local_tag_utf16(pb, 0x3C04, version); // Version String

    // write product uid
    mxf_write_local_tag(pb, 16, 0x3C05);
    mxf_write_uuid(pb, Identification, 2);

    // modification date
    mxf_write_local_tag(pb, 8, 0x3C06);
    put_be64(pb, mxf->timestamp);
}

static void mxf_write_content_storage(AVFormatContext *s)
{
    ByteIOContext *pb = s->pb;

    mxf_write_metadata_key(pb, 0x011800);
    PRINT_KEY(s, "content storage key", pb->buf_ptr - 16);
    klv_encode_ber_length(pb, 92);

    // write uid
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, ContentStorage, 0);
    PRINT_KEY(s, "content storage uid", pb->buf_ptr - 16);

    // write package reference
    mxf_write_local_tag(pb, 16 * 2 + 8, 0x1901);
    mxf_write_refs_count(pb, 2);
    mxf_write_uuid(pb, MaterialPackage, 0);
    mxf_write_uuid(pb, SourcePackage, 0);

    // write essence container data
    mxf_write_local_tag(pb, 8 + 16, 0x1902);
    mxf_write_refs_count(pb, 1);
    mxf_write_uuid(pb, EssenceContainerData, 0);
}

static void mxf_write_track(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    MXFStreamContext *sc = st->priv_data;

    mxf_write_metadata_key(pb, 0x013b00);
    PRINT_KEY(s, "track key", pb->buf_ptr - 16);
    klv_encode_ber_length(pb, 80);

    // write track uid
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, st->index);
    PRINT_KEY(s, "track uid", pb->buf_ptr - 16);

    // write track id
    mxf_write_local_tag(pb, 4, 0x4801);
    put_be32(pb, st->index+2);

    // write track number
    mxf_write_local_tag(pb, 4, 0x4804);
    if (type == MaterialPackage)
        put_be32(pb, 0); // track number of material package is 0
    else
        put_buffer(pb, sc->track_essence_element_key + 12, 4);

    mxf_write_local_tag(pb, 8, 0x4B01);
    put_be32(pb, mxf->time_base.den);
    put_be32(pb, mxf->time_base.num);

    // write origin
    mxf_write_local_tag(pb, 8, 0x4B02);
    put_be64(pb, 0);

    // write sequence refs
    mxf_write_local_tag(pb, 16, 0x4803);
    mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);
}

static const uint8_t smpte_12m_timecode_track_data_ul[] = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x01,0x01,0x00,0x00,0x00 };

static void mxf_write_common_fields(AVFormatContext *s, AVStream *st)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;

    // find data define uls
    mxf_write_local_tag(pb, 16, 0x0201);
    if (st == mxf->timecode_track)
        put_buffer(pb, smpte_12m_timecode_track_data_ul, 16);
    else {
        const MXFCodecUL *data_def_ul = mxf_get_data_definition_ul(st->codec->codec_type);
        put_buffer(pb, data_def_ul->uid, 16);
    }

    // write duration
    mxf_write_local_tag(pb, 8, 0x0202);
    put_be64(pb, mxf->duration);
}

static void mxf_write_sequence(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    enum MXFMetadataSetType component;

    mxf_write_metadata_key(pb, 0x010f00);
    PRINT_KEY(s, "sequence key", pb->buf_ptr - 16);
    klv_encode_ber_length(pb, 80);

    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, type == MaterialPackage ? Sequence: Sequence + TypeBottom, st->index);

    PRINT_KEY(s, "sequence uid", pb->buf_ptr - 16);
    mxf_write_common_fields(s, st);

    // write structural component
    mxf_write_local_tag(pb, 16 + 8, 0x1001);
    mxf_write_refs_count(pb, 1);
    if (st == mxf->timecode_track)
        component = TimecodeComponent;
    else
        component = SourceClip;
    if (type == SourcePackage)
        component += TypeBottom;
    mxf_write_uuid(pb, component, st->index);
}

static void mxf_write_timecode_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;

    mxf_write_metadata_key(pb, 0x011400);
    klv_encode_ber_length(pb, 75);

    // UID
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, type == MaterialPackage ? TimecodeComponent :
                   TimecodeComponent + TypeBottom, st->index);

    mxf_write_common_fields(s, st);

    // Start Time Code
    mxf_write_local_tag(pb, 8, 0x1501);
    put_be64(pb, mxf->timecode_start);

    // Rounded Time Code Base
    mxf_write_local_tag(pb, 2, 0x1502);
    put_be16(pb, mxf->timecode_base);

    // Drop Frame
    mxf_write_local_tag(pb, 1, 0x1503);
    put_byte(pb, mxf->timecode_drop_frame);
}

static void mxf_write_structural_component(AVFormatContext *s, AVStream *st, enum MXFMetadataSetType type)
{
    ByteIOContext *pb = s->pb;
    int i;

    mxf_write_metadata_key(pb, 0x011100);
    PRINT_KEY(s, "sturctural component key", pb->buf_ptr - 16);
    klv_encode_ber_length(pb, 108);

    // write uid
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, type == MaterialPackage ? SourceClip: SourceClip + TypeBottom, st->index);

    PRINT_KEY(s, "structural component uid", pb->buf_ptr - 16);
    mxf_write_common_fields(s, st);

    // write start_position
    mxf_write_local_tag(pb, 8, 0x1201);
    put_be64(pb, 0);

    // write source package uid, end of the reference
    mxf_write_local_tag(pb, 32, 0x1101);
    if (type == SourcePackage) {
        for (i = 0; i < 4; i++)
            put_be64(pb, 0);
    } else
        mxf_write_umid(s, 1);

    // write source track id
    mxf_write_local_tag(pb, 4, 0x1102);
    if (type == SourcePackage)
        put_be32(pb, 0);
    else
        put_be32(pb, st->index+2);
}

static void mxf_write_multi_descriptor(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    const uint8_t *ul;
    int i;

    mxf_write_metadata_key(pb, 0x014400);
    PRINT_KEY(s, "multiple descriptor key", pb->buf_ptr - 16);
    klv_encode_ber_length(pb, 64 + 16 * s->nb_streams);

    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, MultipleDescriptor, 0);
    PRINT_KEY(s, "multi_desc uid", pb->buf_ptr - 16);

    // write sample rate
    mxf_write_local_tag(pb, 8, 0x3001);
    put_be32(pb, mxf->time_base.den);
    put_be32(pb, mxf->time_base.num);

    // write essence container ul
    mxf_write_local_tag(pb, 16, 0x3004);
    if (mxf->essence_container_count > 1)
        ul = multiple_desc_ul;
    else {
        MXFStreamContext *sc = s->streams[0]->priv_data;
        ul = mxf_essence_container_uls[sc->index].container_ul;
    }
    put_buffer(pb, ul, 16);

    // write sub descriptor refs
    mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x3F01);
    mxf_write_refs_count(pb, s->nb_streams);
    for (i = 0; i < s->nb_streams; i++)
        mxf_write_uuid(pb, SubDescriptor, i);
}

static void mxf_write_generic_desc(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
{
    MXFContext *mxf = s->priv_data;
    MXFStreamContext *sc = st->priv_data;
    ByteIOContext *pb = s->pb;

    put_buffer(pb, key, 16);
    klv_encode_ber_length(pb, size+20+8+12+20);

    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, SubDescriptor, st->index);

    mxf_write_local_tag(pb, 4, 0x3006);
    put_be32(pb, st->index+2);

    mxf_write_local_tag(pb, 8, 0x3001);
    put_be32(pb, mxf->time_base.den);
    put_be32(pb, mxf->time_base.num);

    mxf_write_local_tag(pb, 16, 0x3004);
    put_buffer(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
}

static const UID mxf_mpegvideo_descriptor_key = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 };
static const UID mxf_wav_descriptor_key       = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 };
static const UID mxf_aes3_descriptor_key      = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 };
static const UID mxf_cdci_descriptor_key      = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01,0x01,0x28,0x00 };
static const UID mxf_generic_sound_descriptor_key = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01,0x01,0x42,0x00 };

static void mxf_write_cdci_common(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
{
    MXFStreamContext *sc = st->priv_data;
    ByteIOContext *pb = s->pb;
    int stored_height = (st->codec->height+15)/16*16;
    int display_height;
    int f1, f2;

    mxf_write_generic_desc(s, st, key, size+8+8+8+8+8+8+5+16+sc->interlaced*4+12+20);

    mxf_write_local_tag(pb, 4, 0x3203);
    put_be32(pb, st->codec->width);

    mxf_write_local_tag(pb, 4, 0x3202);
    put_be32(pb, stored_height>>sc->interlaced);

    mxf_write_local_tag(pb, 4, 0x3209);
    put_be32(pb, st->codec->width);

    if (st->codec->height == 608) // PAL + VBI
        display_height = 576;
    else if (st->codec->height == 512)  // NTSC + VBI
        display_height = 486;
    else
        display_height = st->codec->height;

    mxf_write_local_tag(pb, 4, 0x3208);
    put_be32(pb, display_height>>sc->interlaced);

    // component depth
    mxf_write_local_tag(pb, 4, 0x3301);
    put_be32(pb, 8);

    // horizontal subsampling
    mxf_write_local_tag(pb, 4, 0x3302);
    put_be32(pb, 2);

    // frame layout
    mxf_write_local_tag(pb, 1, 0x320C);
    put_byte(pb, sc->interlaced);

    // video line map
    switch (st->codec->height) {
    case  576: f1 = 23; f2 = 336; break;
    case  608: f1 =  7; f2 = 320; break;
    case  480: f1 = 20; f2 = 283; break;
    case  512: f1 =  7; f2 = 270; break;
    case  720: f1 = 26; f2 =   0; break; // progressive
    case 1080: f1 = 21; f2 = 584; break;
    default:   f1 =  0; f2 =   0; break;
    }

    if (!sc->interlaced) {
        f2  = 0;
        f1 *= 2;
    }

    mxf_write_local_tag(pb, 12+sc->interlaced*4, 0x320D);
    put_be32(pb, sc->interlaced ? 2 : 1);
    put_be32(pb, 4);
    put_be32(pb, f1);
    if (sc->interlaced)
        put_be32(pb, f2);

    mxf_write_local_tag(pb, 8, 0x320E);
    put_be32(pb, sc->aspect_ratio.num);
    put_be32(pb, sc->aspect_ratio.den);

    mxf_write_local_tag(pb, 16, 0x3201);
    put_buffer(pb, *sc->codec_ul, 16);
}

static void mxf_write_cdci_desc(AVFormatContext *s, AVStream *st)
{
    mxf_write_cdci_common(s, st, mxf_cdci_descriptor_key, 0);
}

static void mxf_write_mpegvideo_desc(AVFormatContext *s, AVStream *st)
{
    ByteIOContext *pb = s->pb;

    mxf_write_cdci_common(s, st, mxf_mpegvideo_descriptor_key, 8);

    // bit rate
    mxf_write_local_tag(pb, 4, 0x8000);
    put_be32(pb, st->codec->bit_rate);
}

static void mxf_write_generic_sound_common(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
{
    ByteIOContext *pb = s->pb;

    mxf_write_generic_desc(s, st, key, size+5+12+8+8);

    // audio locked
    mxf_write_local_tag(pb, 1, 0x3D02);
    put_byte(pb, 1);

    // write audio sampling rate
    mxf_write_local_tag(pb, 8, 0x3D03);
    put_be32(pb, st->codec->sample_rate);
    put_be32(pb, 1);

    mxf_write_local_tag(pb, 4, 0x3D07);
    put_be32(pb, st->codec->channels);

    mxf_write_local_tag(pb, 4, 0x3D01);
    put_be32(pb, av_get_bits_per_sample(st->codec->codec_id));
}

static void mxf_write_wav_common(AVFormatContext *s, AVStream *st, const UID key, unsigned size)
{
    ByteIOContext *pb = s->pb;

    mxf_write_generic_sound_common(s, st, key, size+6+8);

    mxf_write_local_tag(pb, 2, 0x3D0A);
    put_be16(pb, st->codec->block_align);

    // avg bytes per sec
    mxf_write_local_tag(pb, 4, 0x3D09);
    put_be32(pb, st->codec->block_align*st->codec->sample_rate);
}

static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st)
{
    mxf_write_wav_common(s, st, mxf_wav_descriptor_key, 0);
}

static void mxf_write_aes3_desc(AVFormatContext *s, AVStream *st)
{
    mxf_write_wav_common(s, st, mxf_aes3_descriptor_key, 0);
}

static void mxf_write_generic_sound_desc(AVFormatContext *s, AVStream *st)
{
    mxf_write_generic_sound_common(s, st, mxf_generic_sound_descriptor_key, 0);
}

static void mxf_write_package(AVFormatContext *s, enum MXFMetadataSetType type)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    int i, track_count = s->nb_streams+1;

    if (type == MaterialPackage) {
        mxf_write_metadata_key(pb, 0x013600);
        PRINT_KEY(s, "Material Package key", pb->buf_ptr - 16);
        klv_encode_ber_length(pb, 92 + 16*track_count);
    } else {
        mxf_write_metadata_key(pb, 0x013700);
        PRINT_KEY(s, "Source Package key", pb->buf_ptr - 16);
        klv_encode_ber_length(pb, 112 + 16*track_count); // 20 bytes length for descriptor reference
    }

    // write uid
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, type, 0);
    av_log(s,AV_LOG_DEBUG, "package type:%d\n", type);
    PRINT_KEY(s, "package uid", pb->buf_ptr - 16);

    // write package umid
    mxf_write_local_tag(pb, 32, 0x4401);
    mxf_write_umid(s, type == SourcePackage);
    PRINT_KEY(s, "package umid second part", pb->buf_ptr - 16);

    // package creation date
    mxf_write_local_tag(pb, 8, 0x4405);
    put_be64(pb, mxf->timestamp);

    // package modified date
    mxf_write_local_tag(pb, 8, 0x4404);
    put_be64(pb, mxf->timestamp);

    // write track refs
    mxf_write_local_tag(pb, track_count*16 + 8, 0x4403);
    mxf_write_refs_count(pb, track_count);
    mxf_write_uuid(pb, type == MaterialPackage ? Track :
                   Track + TypeBottom, -1); // timecode track
    for (i = 0; i < s->nb_streams; i++)
        mxf_write_uuid(pb, type == MaterialPackage ? Track : Track + TypeBottom, i);

    // write multiple descriptor reference
    if (type == SourcePackage) {
        mxf_write_local_tag(pb, 16, 0x4701);
        if (s->nb_streams > 1) {
            mxf_write_uuid(pb, MultipleDescriptor, 0);
            mxf_write_multi_descriptor(s);
        } else
            mxf_write_uuid(pb, SubDescriptor, 0);
    }

    // write timecode track
    mxf_write_track(s, mxf->timecode_track, type);
    mxf_write_sequence(s, mxf->timecode_track, type);
    mxf_write_timecode_component(s, mxf->timecode_track, type);

    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        mxf_write_track(s, st, type);
        mxf_write_sequence(s, st, type);
        mxf_write_structural_component(s, st, type);

        if (type == SourcePackage) {
            MXFStreamContext *sc = st->priv_data;
            mxf_essence_container_uls[sc->index].write_desc(s, st);
        }
    }
}

static int mxf_write_essence_container_data(AVFormatContext *s)
{
    ByteIOContext *pb = s->pb;

    mxf_write_metadata_key(pb, 0x012300);
    klv_encode_ber_length(pb, 72);

    mxf_write_local_tag(pb, 16, 0x3C0A); // Instance UID
    mxf_write_uuid(pb, EssenceContainerData, 0);

    mxf_write_local_tag(pb, 32, 0x2701); // Linked Package UID
    mxf_write_umid(s, 1);

    mxf_write_local_tag(pb, 4, 0x3F07); // BodySID
    put_be32(pb, 1);

    mxf_write_local_tag(pb, 4, 0x3F06); // IndexSID
    put_be32(pb, 2);

    return 0;
}

static int mxf_write_header_metadata_sets(AVFormatContext *s)
{
    mxf_write_preface(s);
    mxf_write_identification(s);
    mxf_write_content_storage(s);
    mxf_write_package(s, MaterialPackage);
    mxf_write_package(s, SourcePackage);
    mxf_write_essence_container_data(s);
    return 0;
}

static unsigned klv_fill_size(uint64_t size)
{
    unsigned pad = KAG_SIZE - (size & (KAG_SIZE-1));
    if (pad < 20) // smallest fill item possible
        return pad + KAG_SIZE;
    else
        return pad & (KAG_SIZE-1);
}

static void mxf_write_index_table_segment(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    int i, j;
    int temporal_reordering = 0;
    int key_index = mxf->last_key_index;

    av_log(s, AV_LOG_DEBUG, "edit units count %d\n", mxf->edit_units_count);

    if (!mxf->edit_units_count && !mxf->edit_unit_byte_count)
        return;

    put_buffer(pb, index_table_segment_key, 16);

    if (mxf->edit_unit_byte_count) {
        klv_encode_ber_length(pb, 80);
    } else {
        klv_encode_ber_length(pb, 85 + 12+(s->nb_streams+1)*6 +
                              12+mxf->edit_units_count*(11+mxf->slice_count*4));
    }

    // instance id
    mxf_write_local_tag(pb, 16, 0x3C0A);
    mxf_write_uuid(pb, IndexTableSegment, 0);

    // index edit rate
    mxf_write_local_tag(pb, 8, 0x3F0B);
    put_be32(pb, mxf->time_base.den);
    put_be32(pb, mxf->time_base.num);

    // index start position
    mxf_write_local_tag(pb, 8, 0x3F0C);
    put_be64(pb, mxf->last_indexed_edit_unit);

    // index duration
    mxf_write_local_tag(pb, 8, 0x3F0D);
    put_be64(pb, mxf->edit_units_count);

    // edit unit byte count
    mxf_write_local_tag(pb, 4, 0x3F05);
    put_be32(pb, mxf->edit_unit_byte_count);

    // index sid
    mxf_write_local_tag(pb, 4, 0x3F06);
    put_be32(pb, 2);

    // body sid
    mxf_write_local_tag(pb, 4, 0x3F07);
    put_be32(pb, 1);

    if (!mxf->edit_unit_byte_count) {
        // real slice count - 1
        mxf_write_local_tag(pb, 1, 0x3F08);
        put_byte(pb, mxf->slice_count);

        // delta entry array
        mxf_write_local_tag(pb, 8 + (s->nb_streams+1)*6, 0x3F09);
        put_be32(pb, s->nb_streams+1); // num of entries
        put_be32(pb, 6);               // size of one entry
        // write system item delta entry
        put_byte(pb, 0);
        put_byte(pb, 0); // slice entry
        put_be32(pb, 0); // element delta
        for (i = 0; i < s->nb_streams; i++) {
            AVStream *st = s->streams[i];
            MXFStreamContext *sc = st->priv_data;
            put_byte(pb, sc->temporal_reordering);
            if (sc->temporal_reordering)
                temporal_reordering = 1;
            if (i == 0) { // video track
                put_byte(pb, 0); // slice number
                put_be32(pb, KAG_SIZE); // system item size including klv fill
            } else { // audio track
                unsigned audio_frame_size = sc->aic.samples[0]*sc->aic.sample_size;
                audio_frame_size += klv_fill_size(audio_frame_size);
                put_byte(pb, 1);
                put_be32(pb, (i-1)*audio_frame_size); // element delta
            }
        }

        mxf_write_local_tag(pb, 8 + mxf->edit_units_count*(11+mxf->slice_count*4), 0x3F0A);
        put_be32(pb, mxf->edit_units_count);  // num of entries
        put_be32(pb, 11+mxf->slice_count*4);  // size of one entry
        for (i = 0; i < mxf->edit_units_count; i++) {
            if (temporal_reordering) {
                int temporal_offset = 0;
                for (j = i+1; j < mxf->edit_units_count; j++) {
                    temporal_offset++;
                    if (mxf->index_entries[j].flags & 0x10) { // backward prediction
                        // next is not b, so is reordered
                        if (!(mxf->index_entries[i+1].flags & 0x10)) {
                            if ((mxf->index_entries[i].flags & 0x11) == 0) // i frame
                                temporal_offset = 0;
                            else
                                temporal_offset = -temporal_offset;
                        }
                        break;
                    }
                }
                put_byte(pb, temporal_offset);
            } else
                put_byte(pb, 0);
            if (!(mxf->index_entries[i].flags & 0x33)) { // I frame
                mxf->last_key_index = key_index;
                key_index = i;
            }
            if (mxf->index_entries[i].flags & 0x10 && // backward prediction
                !(mxf->index_entries[key_index].flags & 0x80)) { // open gop
                put_byte(pb, mxf->last_key_index - i);
            } else {
                put_byte(pb, key_index - i); // key frame offset
                if ((mxf->index_entries[i].flags & 0x20) == 0x20) // only forward
                    mxf->last_key_index = key_index;
            }
            put_byte(pb, mxf->index_entries[i].flags);
            // stream offset
            put_be64(pb, mxf->index_entries[i].offset);
            if (s->nb_streams > 1)
                put_be32(pb, mxf->index_entries[i].slice_offset);
        }

        mxf->last_key_index = key_index - mxf->edit_units_count;
        mxf->last_indexed_edit_unit += mxf->edit_units_count;
        mxf->edit_units_count = 0;
    }
}

static void mxf_write_klv_fill(AVFormatContext *s)
{
    unsigned pad = klv_fill_size(url_ftell(s->pb));
    if (pad) {
        put_buffer(s->pb, klv_fill_key, 16);
        pad -= 16 + 4;
        klv_encode_ber4_length(s->pb, pad);
        for (; pad; pad--)
            put_byte(s->pb, 0);
        assert(!(url_ftell(s->pb) & (KAG_SIZE-1)));
    }
}

static void mxf_write_partition(AVFormatContext *s, int bodysid,
                                int indexsid,
                                const uint8_t *key, int write_metadata)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    int64_t header_byte_count_offset;
    unsigned index_byte_count = 0;
    uint64_t partition_offset = url_ftell(pb);

    if (!mxf->edit_unit_byte_count && mxf->edit_units_count)
        index_byte_count = 85 + 12+(s->nb_streams+1)*6 +
            12+mxf->edit_units_count*(11+mxf->slice_count*4);
    else if (mxf->edit_unit_byte_count && indexsid)
        index_byte_count = 80;

    if (index_byte_count) {
        // add encoded ber length
        index_byte_count += 16 + klv_ber_length(index_byte_count);
        index_byte_count += klv_fill_size(index_byte_count);
    }

    if (!memcmp(key, body_partition_key, 16)) {
        mxf->body_partition_offset =
            av_realloc(mxf->body_partition_offset,
                       (mxf->body_partitions_count+1)*
                       sizeof(*mxf->body_partition_offset));
        mxf->body_partition_offset[mxf->body_partitions_count++] = partition_offset;
    }

    // write klv
    put_buffer(pb, key, 16);
    klv_encode_ber_length(pb, 88 + 16 * mxf->essence_container_count);

    // write partition value
    put_be16(pb, 1); // majorVersion
    put_be16(pb, 2); // minorVersion
    put_be32(pb, KAG_SIZE); // KAGSize

    put_be64(pb, partition_offset); // ThisPartition

    if (!memcmp(key, body_partition_key, 16) && mxf->body_partitions_count > 1)
        put_be64(pb, mxf->body_partition_offset[mxf->body_partitions_count-2]); // PreviousPartition
    else if (!memcmp(key, footer_partition_key, 16) && mxf->body_partitions_count)
        put_be64(pb, mxf->body_partition_offset[mxf->body_partitions_count-1]); // PreviousPartition
    else
        put_be64(pb, 0);

    put_be64(pb, mxf->footer_partition_offset); // footerPartition

    // set offset
    header_byte_count_offset = url_ftell(pb);
    put_be64(pb, 0); // headerByteCount, update later

    // indexTable
    put_be64(pb, index_byte_count); // indexByteCount
    put_be32(pb, index_byte_count ? indexsid : 0); // indexSID

    // BodyOffset
    if (bodysid && mxf->edit_units_count && mxf->body_partitions_count) {
        put_be64(pb, mxf->body_offset);
    } else
        put_be64(pb, 0);

    put_be32(pb, bodysid); // bodySID

    // operational pattern
    put_buffer(pb, op1a_ul, 16);

    // essence container
    mxf_write_essence_container_refs(s);

    if (write_metadata) {
        // mark the start of the headermetadata and calculate metadata size
        int64_t pos, start;
        unsigned header_byte_count;

        mxf_write_klv_fill(s);
        start = url_ftell(s->pb);
        mxf_write_primer_pack(s);
        mxf_write_header_metadata_sets(s);
        pos = url_ftell(s->pb);
        header_byte_count = pos - start + klv_fill_size(pos);

        // update header_byte_count
        url_fseek(pb, header_byte_count_offset, SEEK_SET);
        put_be64(pb, header_byte_count);
        url_fseek(pb, pos, SEEK_SET);
    }

    put_flush_packet(pb);
}

static const UID mxf_mpeg2_codec_uls[] = {
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x10,0x00 }, // MP-ML I-Frame
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, // MP-ML Long GOP
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, // 422P-ML I-Frame
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, // 422P-ML Long GOP
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x02,0x00 }, // MP-HL I-Frame
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, // MP-HL Long GOP
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, // 422P-HL I-Frame
    { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, // 422P-HL Long GOP
};

static const UID *mxf_get_mpeg2_codec_ul(AVCodecContext *avctx)
{
    if (avctx->profile == 4) { // Main
        if (avctx->level == 8) // Main
            return avctx->gop_size ?
                &mxf_mpeg2_codec_uls[1] :
                &mxf_mpeg2_codec_uls[0];
        else if (avctx->level == 4) // High
            return avctx->gop_size ?
                &mxf_mpeg2_codec_uls[5] :
                &mxf_mpeg2_codec_uls[4];
    } else if (avctx->profile == 0) { // 422
        if (avctx->level == 5) // Main
            return avctx->gop_size ?
                &mxf_mpeg2_codec_uls[3] :
                &mxf_mpeg2_codec_uls[2];
        else if (avctx->level == 2) // High
            return avctx->gop_size ?
                &mxf_mpeg2_codec_uls[7] :
                &mxf_mpeg2_codec_uls[6];
    }
    return NULL;
}

static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st, AVPacket *pkt, int *flags)
{
    MXFStreamContext *sc = st->priv_data;
    MXFContext *mxf = s->priv_data;
    uint32_t c = -1;
    int i;

    *flags = 0;

    for(i = 0; i < pkt->size - 4; i++) {
        c = (c<<8) + pkt->data[i];
        if (c == 0x1B5) {
            if (i + 2 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x10) { // seq ext
                st->codec->profile = pkt->data[i+1] & 0x07;
                st->codec->level   = pkt->data[i+2] >> 4;
            } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext
                sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame
                break;
            }
        } else if (c == 0x1b8) { // gop
            if (i + 4 < pkt->size) {
                if (pkt->data[i+4]>>6 & 0x01) // closed
                    *flags |= 0x80; // random access
                if (!mxf->header_written) {
                    unsigned hours   =  (pkt->data[i+1]>>2) & 0x1f;
                    unsigned minutes = ((pkt->data[i+1] & 0x03) << 4) | (pkt->data[i+2]>>4);
                    unsigned seconds = ((pkt->data[i+2] & 0x07) << 3) | (pkt->data[i+3]>>5);
                    unsigned frames  = ((pkt->data[i+3] & 0x1f) << 1) | (pkt->data[i+4]>>7);
                    mxf->timecode_drop_frame = !!(pkt->data[i+1] & 0x80);
                    mxf->timecode_start = (hours*3600 + minutes*60 + seconds) *
                        mxf->timecode_base + frames;
                    if (mxf->timecode_drop_frame) {
                        unsigned tminutes = 60 * hours + minutes;
                        mxf->timecode_start -= 2 * (tminutes - tminutes / 10);
                    }
                    av_log(s, AV_LOG_DEBUG, "frame %d %d:%d:%d%c%d\n", mxf->timecode_start,
                           hours, minutes, seconds, mxf->timecode_drop_frame ? ';':':', frames);
                }
            }
        } else if (c == 0x1b3) { // seq
            *flags |= 0x40;
            if (i + 4 < pkt->size) {
                switch ((pkt->data[i+4]>>4) & 0xf) {
                case 2:  sc->aspect_ratio = (AVRational){  4,  3}; break;
                case 3:  sc->aspect_ratio = (AVRational){ 16,  9}; break;
                case 4:  sc->aspect_ratio = (AVRational){221,100}; break;
                default:
                    av_reduce(&sc->aspect_ratio.num, &sc->aspect_ratio.den,
                              st->codec->width, st->codec->height, 1024*1024);
                }
            }
        } else if (c == 0x100) { // pic
            int pict_type = (pkt->data[i+2]>>3) & 0x07;
            if (pict_type == 2) { // P frame
                *flags |= 0x22;
                st->codec->gop_size = 1;
            } else if (pict_type == 3) { // B frame
                *flags |= 0x33;
                sc->temporal_reordering = -1;
            } else if (!pict_type) {
                av_log(s, AV_LOG_ERROR, "error parsing mpeg2 frame\n");
                return 0;
            }
        }
    }
    if (s->oformat != &mxf_d10_muxer)
        sc->codec_ul = mxf_get_mpeg2_codec_ul(st->codec);
    return !!sc->codec_ul;
}

static uint64_t mxf_parse_timestamp(time_t timestamp)
{
    struct tm *time = gmtime(&timestamp);
    return (uint64_t)(time->tm_year+1900) << 48 |
           (uint64_t)(time->tm_mon+1)     << 40 |
           (uint64_t) time->tm_mday       << 32 |
                      time->tm_hour       << 24 |
                      time->tm_min        << 16 |
                      time->tm_sec        << 8;
}

static void mxf_gen_umid(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    uint32_t seed = ff_random_get_seed();
    uint64_t umid = seed + 0x5294713400000000LL;

    AV_WB64(mxf->umid  , umid);
    AV_WB64(mxf->umid+8, umid>>8);

    mxf->instance_number = seed;
}

static int mxf_write_header(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    int i;
    uint8_t present[FF_ARRAY_ELEMS(mxf_essence_container_uls)] = {0};
    const int *samples_per_frame = NULL;

    if (!s->nb_streams)
        return -1;

    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        MXFStreamContext *sc = av_mallocz(sizeof(*sc));
        if (!sc)
            return AVERROR(ENOMEM);
        st->priv_data = sc;

        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
            if (i != 0) {
                av_log(s, AV_LOG_ERROR, "video stream must be first track\n");
                return -1;
            }
            if (fabs(av_q2d(st->codec->time_base) - 1/25.0) < 0.0001) {
                samples_per_frame = PAL_samples_per_frame;
                mxf->time_base = (AVRational){ 1, 25 };
                mxf->timecode_base = 25;
            } else if (fabs(av_q2d(st->codec->time_base) - 1001/30000.0) < 0.0001) {
                samples_per_frame = NTSC_samples_per_frame;
                mxf->time_base = (AVRational){ 1001, 30000 };
                mxf->timecode_base = 30;
            } else {
                av_log(s, AV_LOG_ERROR, "unsupported video frame rate\n");
                return -1;
            }
            av_set_pts_info(st, 64, mxf->time_base.num, mxf->time_base.den);
            if (s->oformat == &mxf_d10_muxer) {
                if (st->codec->bit_rate == 50000000)
                    if (mxf->time_base.den == 25) sc->index = 3;
                    else                          sc->index = 5;
                else if (st->codec->bit_rate == 40000000)
                    if (mxf->time_base.den == 25) sc->index = 7;
                    else                          sc->index = 9;
                else if (st->codec->bit_rate == 30000000)
                    if (mxf->time_base.den == 25) sc->index = 11;
                    else                          sc->index = 13;
                else {
                    av_log(s, AV_LOG_ERROR, "error MXF D-10 only support 30/40/50 mbit/s\n");
                    return -1;
                }

                mxf->edit_unit_byte_count = KAG_SIZE; // system element
                mxf->edit_unit_byte_count += 16 + 4 + (uint64_t)st->codec->bit_rate *
                    mxf->time_base.num / (8*mxf->time_base.den);
                mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
                mxf->edit_unit_byte_count += 16 + 4 + 4 + samples_per_frame[0]*8*4;
                mxf->edit_unit_byte_count += klv_fill_size(mxf->edit_unit_byte_count);
            }
        } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
            if (st->codec->sample_rate != 48000) {
                av_log(s, AV_LOG_ERROR, "only 48khz is implemented\n");
                return -1;
            }
            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
            if (s->oformat == &mxf_d10_muxer) {
                if (st->index != 1) {
                    av_log(s, AV_LOG_ERROR, "MXF D-10 only support one audio track\n");
                    return -1;
                }
                if (st->codec->codec_id != CODEC_ID_PCM_S16LE &&
                    st->codec->codec_id != CODEC_ID_PCM_S24LE) {
                    av_log(s, AV_LOG_ERROR, "MXF D-10 only support 16 or 24 bits le audio\n");
                }
                sc->index = ((MXFStreamContext*)s->streams[0]->priv_data)->index + 1;
            } else
            mxf->slice_count = 1;
        }

        if (!sc->index) {
            sc->index = mxf_get_essence_container_ul_index(st->codec->codec_id);
            if (sc->index == -1) {
                av_log(s, AV_LOG_ERROR, "track %d: could not find essence container ul, "
                       "codec not currently supported in container\n", i);
                return -1;
            }
        }

        sc->codec_ul = &mxf_essence_container_uls[sc->index].codec_ul;

        memcpy(sc->track_essence_element_key, mxf_essence_container_uls[sc->index].element_ul, 15);
        sc->track_essence_element_key[15] = present[sc->index];
        PRINT_KEY(s, "track essence element key", sc->track_essence_element_key);

        if (!present[sc->index])
            mxf->essence_container_count++;
        present[sc->index]++;
    }

    if (s->oformat == &mxf_d10_muxer) {
        mxf->essence_container_count = 1;
    }

    if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
        mxf_gen_umid(s);

    for (i = 0; i < s->nb_streams; i++) {
        MXFStreamContext *sc = s->streams[i]->priv_data;
        // update element count
        sc->track_essence_element_key[13] = present[sc->index];
        sc->order = AV_RB32(sc->track_essence_element_key+12);
    }

    if (s->timestamp)
        mxf->timestamp = mxf_parse_timestamp(s->timestamp);
    mxf->duration = -1;

    mxf->timecode_track = av_mallocz(sizeof(*mxf->timecode_track));
    if (!mxf->timecode_track)
        return AVERROR(ENOMEM);
    mxf->timecode_track->priv_data = av_mallocz(sizeof(MXFStreamContext));
    if (!mxf->timecode_track->priv_data)
        return AVERROR(ENOMEM);
    mxf->timecode_track->index = -1;

    if (!samples_per_frame)
        samples_per_frame = PAL_samples_per_frame;

    if (ff_audio_interleave_init(s, samples_per_frame, mxf->time_base) < 0)
        return -1;

    return 0;
}

static const uint8_t system_metadata_pack_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x01,0x00 };
static const uint8_t system_metadata_package_set_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x43,0x01,0x01,0x0D,0x01,0x03,0x01,0x04,0x01,0x02,0x01 };

static uint32_t ff_framenum_to_12m_time_code(unsigned frame, int drop, int fps)
{
    return (0                                    << 31) | // color frame flag
           (0                                    << 30) | // drop  frame flag
           ( ((frame % fps) / 10)                << 28) | // tens  of frames
           ( ((frame % fps) % 10)                << 24) | // units of frames
           (0                                    << 23) | // field phase (NTSC), b0 (PAL)
           ((((frame / fps) % 60) / 10)          << 20) | // tens  of seconds
           ((((frame / fps) % 60) % 10)          << 16) | // units of seconds
           (0                                    << 15) | // b0 (NTSC), b2 (PAL)
           ((((frame / (fps * 60)) % 60) / 10)   << 12) | // tens  of minutes
           ((((frame / (fps * 60)) % 60) % 10)   <<  8) | // units of minutes
           (0                                    <<  7) | // b1
           (0                                    <<  6) | // b2 (NSC), field phase (PAL)
           ((((frame / (fps * 3600) % 24)) / 10) <<  4) | // tens  of hours
           (  (frame / (fps * 3600) % 24)) % 10;          // units of hours
}

static void mxf_write_system_item(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    unsigned frame;
    uint32_t time_code;

    frame = mxf->timecode_start + mxf->last_indexed_edit_unit + mxf->edit_units_count;

    // write system metadata pack
    put_buffer(pb, system_metadata_pack_key, 16);
    klv_encode_ber4_length(pb, 57);
    put_byte(pb, 0x5c); // UL, user date/time stamp, picture and sound item present
    put_byte(pb, 0x04); // content package rate
    put_byte(pb, 0x00); // content package type
    put_be16(pb, 0x00); // channel handle
    put_be16(pb, frame); // continuity count
    if (mxf->essence_container_count > 1)
        put_buffer(pb, multiple_desc_ul, 16);
    else {
        MXFStreamContext *sc = s->streams[0]->priv_data;
        put_buffer(pb, mxf_essence_container_uls[sc->index].container_ul, 16);
    }
    put_byte(pb, 0);
    put_be64(pb, 0);
    put_be64(pb, 0); // creation date/time stamp

    put_byte(pb, 0x81); // SMPTE 12M time code
    time_code = ff_framenum_to_12m_time_code(frame, mxf->timecode_drop_frame, mxf->timecode_base);
    put_be32(pb, time_code);
    put_be32(pb, 0); // binary group data
    put_be64(pb, 0);

    // write system metadata package set
    put_buffer(pb, system_metadata_package_set_key, 16);
    klv_encode_ber4_length(pb, 35);
    put_byte(pb, 0x83); // UMID
    put_be16(pb, 0x20);
    mxf_write_umid(s, 1);
}

static void mxf_write_d10_video_packet(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    int packet_size = (uint64_t)st->codec->bit_rate*mxf->time_base.num /
        (8*mxf->time_base.den); // frame size
    int pad;

    packet_size += 16 + 4;
    packet_size += klv_fill_size(packet_size);

    klv_encode_ber4_length(pb, pkt->size);
    put_buffer(pb, pkt->data, pkt->size);

    // ensure CBR muxing by padding to correct video frame size
    pad = packet_size - pkt->size - 16 - 4;
    if (pad > 20) {
        put_buffer(s->pb, klv_fill_key, 16);
        pad -= 16 + 4;
        klv_encode_ber4_length(s->pb, pad);
        for (; pad; pad--)
            put_byte(s->pb, 0);
        assert(!(url_ftell(s->pb) & (KAG_SIZE-1)));
    } else {
        av_log(s, AV_LOG_WARNING, "cannot fill d-10 video packet\n");
        for (; pad > 0; pad--)
            put_byte(s->pb, 0);
    }
}

static void mxf_write_d10_audio_packet(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    int frame_size = pkt->size / st->codec->block_align;
    uint8_t *samples = pkt->data;
    uint8_t *end = pkt->data + pkt->size;
    int i;

    klv_encode_ber4_length(pb, 4 + frame_size*4*8);

    put_byte(pb, (frame_size == 1920 ? 0 : (mxf->edit_units_count-1) % 5 + 1));
    put_le16(pb, frame_size);
    put_byte(pb, (1<<st->codec->channels)-1);

    while (samples < end) {
        for (i = 0; i < st->codec->channels; i++) {
            uint32_t sample;
            if (st->codec->codec_id == CODEC_ID_PCM_S24LE) {
                sample = AV_RL24(samples)<< 4;
                samples += 3;
            } else {
                sample = AV_RL16(samples)<<12;
                samples += 2;
            }
            put_le32(pb, sample | i);
        }
        for (; i < 8; i++)
            put_le32(pb, i);
    }
}

static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    AVStream *st = s->streams[pkt->stream_index];
    MXFStreamContext *sc = st->priv_data;
    int flags = 0;

    if (!mxf->edit_unit_byte_count && !(mxf->edit_units_count % EDIT_UNITS_PER_BODY)) {
        mxf->index_entries = av_realloc(mxf->index_entries,
            (mxf->edit_units_count + EDIT_UNITS_PER_BODY)*sizeof(*mxf->index_entries));
        if (!mxf->index_entries) {
            av_log(s, AV_LOG_ERROR, "could not allocate index entries\n");
            return -1;
        }
    }

    if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
        if (!mxf_parse_mpeg2_frame(s, st, pkt, &flags)) {
            av_log(s, AV_LOG_ERROR, "could not get mpeg2 profile and level\n");
            return -1;
        }
    }

    if (!mxf->header_written) {
        if (mxf->edit_unit_byte_count) {
            mxf_write_partition(s, 1, 2, header_open_partition_key, 1);
            mxf_write_klv_fill(s);
            mxf_write_index_table_segment(s);
        } else {
            mxf_write_partition(s, 0, 0, header_open_partition_key, 1);
        }
        mxf->header_written = 1;
    }

    if (st->index == 0) {
        if (!mxf->edit_unit_byte_count &&
            (!mxf->edit_units_count || mxf->edit_units_count > EDIT_UNITS_PER_BODY) &&
            !(flags & 0x33)) { // I frame, Gop start
            mxf_write_klv_fill(s);
            mxf_write_partition(s, 1, 2, body_partition_key, 0);

            mxf_write_klv_fill(s);
            mxf_write_index_table_segment(s);
        }

        mxf_write_klv_fill(s);
        mxf_write_system_item(s);

        if (!mxf->edit_unit_byte_count) {
            mxf->index_entries[mxf->edit_units_count].offset = mxf->body_offset;
            mxf->index_entries[mxf->edit_units_count].flags = flags;
            mxf->body_offset += KAG_SIZE; // size of system element
        }
        mxf->edit_units_count++;
    } else if (!mxf->edit_unit_byte_count && st->index == 1) {
        mxf->index_entries[mxf->edit_units_count-1].slice_offset =
            mxf->body_offset - mxf->index_entries[mxf->edit_units_count-1].offset;
    }

    mxf_write_klv_fill(s);
    put_buffer(pb, sc->track_essence_element_key, 16); // write key
    if (s->oformat == &mxf_d10_muxer) {
        if (st->codec->codec_type == CODEC_TYPE_VIDEO)
            mxf_write_d10_video_packet(s, st, pkt);
        else
            mxf_write_d10_audio_packet(s, st, pkt);
    } else {
        klv_encode_ber4_length(pb, pkt->size); // write length
        put_buffer(pb, pkt->data, pkt->size);
        mxf->body_offset += 16+4+pkt->size + klv_fill_size(16+4+pkt->size);
    }

    put_flush_packet(pb);

    return 0;
}

static void mxf_write_random_index_pack(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    uint64_t pos = url_ftell(pb);
    int i;

    put_buffer(pb, random_index_pack_key, 16);
    klv_encode_ber_length(pb, 28 + 12*mxf->body_partitions_count);

    if (mxf->edit_unit_byte_count)
        put_be32(pb, 1); // BodySID of header partition
    else
        put_be32(pb, 0);
    put_be64(pb, 0); // offset of header partition

    for (i = 0; i < mxf->body_partitions_count; i++) {
        put_be32(pb, 1); // BodySID
        put_be64(pb, mxf->body_partition_offset[i]);
    }

    put_be32(pb, 0); // BodySID of footer partition
    put_be64(pb, mxf->footer_partition_offset);

    put_be32(pb, url_ftell(pb) - pos + 4);
}

static int mxf_write_footer(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    ByteIOContext *pb = s->pb;

    mxf->duration = mxf->last_indexed_edit_unit + mxf->edit_units_count;

    mxf_write_klv_fill(s);
    mxf->footer_partition_offset = url_ftell(pb);
    if (mxf->edit_unit_byte_count) { // no need to repeat index
        mxf_write_partition(s, 0, 0, footer_partition_key, 0);
    } else {
        mxf_write_partition(s, 0, 2, footer_partition_key, 0);

        mxf_write_klv_fill(s);
        mxf_write_index_table_segment(s);
    }

    mxf_write_klv_fill(s);
    mxf_write_random_index_pack(s);

    if (!url_is_streamed(s->pb)) {
        url_fseek(pb, 0, SEEK_SET);
        if (mxf->edit_unit_byte_count) {
            mxf_write_partition(s, 1, 2, header_closed_partition_key, 1);
            mxf_write_klv_fill(s);
            mxf_write_index_table_segment(s);
        } else {
            mxf_write_partition(s, 0, 0, header_closed_partition_key, 1);
        }
    }

    put_flush_packet(pb);

    ff_audio_interleave_close(s);

    av_freep(&mxf->index_entries);
    av_freep(&mxf->body_partition_offset);
    av_freep(&mxf->timecode_track->priv_data);
    av_freep(&mxf->timecode_track);

    mxf_free(s);

    return 0;
}

static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
{
    AVPacketList *pktl;
    int stream_count = 0;
    int streams[MAX_STREAMS];

    memset(streams, 0, sizeof(streams));
    pktl = s->packet_buffer;
    while (pktl) {
        //av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);
        if (!streams[pktl->pkt.stream_index])
            stream_count++;
        streams[pktl->pkt.stream_index]++;
        pktl = pktl->next;
    }

    if (stream_count && (s->nb_streams == stream_count || flush)) {
        pktl = s->packet_buffer;
        if (s->nb_streams != stream_count) {
            AVPacketList *last = NULL;
            // find last packet in edit unit
            while (pktl) {
                if (!stream_count || pktl->pkt.stream_index == 0)
                    break;
                last = pktl;
                pktl = pktl->next;
                stream_count--;
            }
            // purge packet queue
            while (pktl) {
                AVPacketList *next = pktl->next;
                av_free_packet(&pktl->pkt);
                av_freep(&pktl);
                pktl = next;
            }
            if (last)
                last->next = NULL;
            else {
                s->packet_buffer = NULL;
                goto out;
            }
            pktl = s->packet_buffer;
        }

        *out = pktl->pkt;
        //av_log(s, AV_LOG_DEBUG, "out st:%d dts:%lld\n", (*out).stream_index, (*out).dts);
        s->packet_buffer = pktl->next;
        av_freep(&pktl);
        return 1;
    } else {
    out:
        av_init_packet(out);
        return 0;
    }
}

static int mxf_compare_timestamps(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
{
    MXFStreamContext *sc  = s->streams[pkt ->stream_index]->priv_data;
    MXFStreamContext *sc2 = s->streams[next->stream_index]->priv_data;

    return next->dts > pkt->dts ||
        (next->dts == pkt->dts && sc->order < sc2->order);
}

static int mxf_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
{
    return ff_audio_rechunk_interleave(s, out, pkt, flush,
                               mxf_interleave_get_packet, mxf_compare_timestamps);
}

AVOutputFormat mxf_muxer = {
    "mxf",
    NULL_IF_CONFIG_SMALL("Material eXchange Format"),
    "application/mxf",
    "mxf",
    sizeof(MXFContext),
    CODEC_ID_PCM_S16LE,
    CODEC_ID_MPEG2VIDEO,
    mxf_write_header,
    mxf_write_packet,
    mxf_write_footer,
    AVFMT_NOTIMESTAMPS,
    NULL,
    mxf_interleave,
};

AVOutputFormat mxf_d10_muxer = {
    "mxf_d10",
    NULL_IF_CONFIG_SMALL("Material eXchange Format, D-10 Mapping"),
    "application/mxf",
    NULL,
    sizeof(MXFContext),
    CODEC_ID_PCM_S16LE,
    CODEC_ID_MPEG2VIDEO,
    mxf_write_header,
    mxf_write_packet,
    mxf_write_footer,
    AVFMT_NOTIMESTAMPS,
    NULL,
    mxf_interleave,
};
OpenPOWER on IntegriCloud