aboutsummaryrefslogblamecommitdiffstats
path: root/Game/Code/lib/ffmpeg/avcodec.pas
blob: 88447ffc0b16ac9e1ae1e526f4b626b121dbe2df (plain) (tree)
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
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
























                                                                                                                   
                 

                        
           
         









                                                                     
                 
 
      






































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                                 
                                                                              (*
 * copyright (c) 2001 Fabrice Bellard
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
                                                                              *)

(* This is a part of Pascal porting of ffmpeg.  Originally by Victor Zinetz for Delphi and Free Pascal on Windows.
For Mac OS X, some modifications were made by The Creative CAT, denoted as CAT
in the source codes *)

unit avcodec;

{$IFDEF FPC}
  {$IFDEF LINUX}
  {$LINKLIB libavutil}
  {$LINKLIB libavcodec}
  {$ENDIF}
	
  {$MODE DELPHI } (* CAT *)
  {$PACKENUM 4}    (* every enum type variables uses 4 bytes, CAT *)
  {$PACKRECORDS C}    (* GCC compatible, Record Packing, CAT *)
{$ENDIF}

interface

uses
  avutil, rational, opt;  // CAT

{$I version.inc}

const
  AV_NOPTS_VALUE: int64   = $8000000000000000;
  AV_TIME_BASE            = 1000000;
  AV_TIME_BASE_Q          : TAVRational = (num:1; den:AV_TIME_BASE); (* added by CAT *)

type
  TCodecID = (
    CODEC_ID_NONE, CODEC_ID_MPEG1VIDEO,
    CODEC_ID_MPEG2VIDEO, //* prefered ID for MPEG Video 1 or 2 decoding */
    CODEC_ID_MPEG2VIDEO_XVMC, CODEC_ID_H261, CODEC_ID_H263, CODEC_ID_RV10,
    CODEC_ID_RV20, CODEC_ID_MJPEG, CODEC_ID_MJPEGB, CODEC_ID_LJPEG,
    CODEC_ID_SP5X, CODEC_ID_JPEGLS, CODEC_ID_MPEG4, CODEC_ID_RAWVIDEO,
    CODEC_ID_MSMPEG4V1, CODEC_ID_MSMPEG4V2, CODEC_ID_MSMPEG4V3,
    CODEC_ID_WMV1, CODEC_ID_WMV2, CODEC_ID_H263P,
    CODEC_ID_H263I, CODEC_ID_FLV1, CODEC_ID_SVQ1, CODEC_ID_SVQ3,
    CODEC_ID_DVVIDEO, CODEC_ID_HUFFYUV, CODEC_ID_CYUV, CODEC_ID_H264,
    CODEC_ID_INDEO3, CODEC_ID_VP3, CODEC_ID_THEORA, CODEC_ID_ASV1,
    CODEC_ID_ASV2, CODEC_ID_FFV1, CODEC_ID_4XM, CODEC_ID_VCR1,
    CODEC_ID_CLJR, CODEC_ID_MDEC, CODEC_ID_ROQ, CODEC_ID_INTERPLAY_VIDEO,
    CODEC_ID_XAN_WC3, CODEC_ID_XAN_WC4, CODEC_ID_RPZA, CODEC_ID_CINEPAK,
    CODEC_ID_WS_VQA, CODEC_ID_MSRLE, CODEC_ID_MSVIDEO1, CODEC_ID_IDCIN,
    CODEC_ID_8BPS, CODEC_ID_SMC, CODEC_ID_FLIC, CODEC_ID_TRUEMOTION1,
    CODEC_ID_VMDVIDEO, CODEC_ID_MSZH, CODEC_ID_ZLIB, CODEC_ID_QTRLE,
    CODEC_ID_SNOW, CODEC_ID_TSCC, CODEC_ID_ULTI, CODEC_ID_QDRAW,
    CODEC_ID_VIXL, CODEC_ID_QPEG, CODEC_ID_XVID, CODEC_ID_PNG,
    CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PGM, CODEC_ID_PGMYUV,
    CODEC_ID_PAM, CODEC_ID_FFVHUFF, CODEC_ID_RV30, CODEC_ID_RV40,
    CODEC_ID_VC1, CODEC_ID_WMV3, CODEC_ID_LOCO, CODEC_ID_WNV1,
    CODEC_ID_AASC, CODEC_ID_INDEO2, CODEC_ID_FRAPS, CODEC_ID_TRUEMOTION2,
    CODEC_ID_BMP, CODEC_ID_CSCD, CODEC_ID_MMVIDEO, CODEC_ID_ZMBV,
    CODEC_ID_AVS, CODEC_ID_SMACKVIDEO, CODEC_ID_NUV, CODEC_ID_KMVC,
    CODEC_ID_FLASHSV, CODEC_ID_CAVS, CODEC_ID_JPEG2000, CODEC_ID_VMNC,
    CODEC_ID_VP5, CODEC_ID_VP6, CODEC_ID_VP6F,

    //* various pcm "codecs" */
    CODEC_ID_PCM_S16LE= $10000,  CODEC_ID_PCM_S16BE, CODEC_ID_PCM_U16LE,
    CODEC_ID_PCM_U16BE, CODEC_ID_PCM_S8, CODEC_ID_PCM_U8, CODEC_ID_PCM_MULAW,
    CODEC_ID_PCM_ALAW, CODEC_ID_PCM_S32LE, CODEC_ID_PCM_S32BE, CODEC_ID_PCM_U32LE,
    CODEC_ID_PCM_U32BE, CODEC_ID_PCM_S24LE, CODEC_ID_PCM_S24BE, CODEC_ID_PCM_U24LE,
    CODEC_ID_PCM_U24BE, CODEC_ID_PCM_S24DAUD,
    //* various adpcm codecs */
    CODEC_ID_ADPCM_IMA_QT= $11000, CODEC_ID_ADPCM_IMA_WAV, CODEC_ID_ADPCM_IMA_DK3,
    CODEC_ID_ADPCM_IMA_DK4, CODEC_ID_ADPCM_IMA_WS, CODEC_ID_ADPCM_IMA_SMJPEG,
    CODEC_ID_ADPCM_MS, CODEC_ID_ADPCM_4XM, CODEC_ID_ADPCM_XA, CODEC_ID_ADPCM_ADX,
    CODEC_ID_ADPCM_EA, CODEC_ID_ADPCM_G726, CODEC_ID_ADPCM_CT, CODEC_ID_ADPCM_SWF,
    CODEC_ID_ADPCM_YAMAHA, CODEC_ID_ADPCM_SBPRO_4, CODEC_ID_ADPCM_SBPRO_3,
    CODEC_ID_ADPCM_SBPRO_2,
    //* AMR */
    CODEC_ID_AMR_NB= $12000, CODEC_ID_AMR_WB,
    //* RealAudio codecs*/
    CODEC_ID_RA_144= $13000, CODEC_ID_RA_288,
    //* various DPCM codecs */
    CODEC_ID_ROQ_DPCM= $14000, CODEC_ID_INTERPLAY_DPCM, CODEC_ID_XAN_DPCM,
    CODEC_ID_SOL_DPCM, CODEC_ID_MP2= $15000,
    CODEC_ID_MP3, //* prefered ID for MPEG Audio layer 1, 2 or3 decoding */
    CODEC_ID_AAC, CODEC_ID_MPEG4AAC, CODEC_ID_AC3, CODEC_ID_DTS, CODEC_ID_VORBIS,
    CODEC_ID_DVAUDIO, CODEC_ID_WMAV1, CODEC_ID_WMAV2, CODEC_ID_MACE3,
    CODEC_ID_MACE6, CODEC_ID_VMDAUDIO, CODEC_ID_SONIC, CODEC_ID_SONIC_LS,
    CODEC_ID_FLAC, CODEC_ID_MP3ADU, CODEC_ID_MP3ON4, CODEC_ID_SHORTEN,
    CODEC_ID_ALAC, CODEC_ID_WESTWOOD_SND1, CODEC_ID_GSM, CODEC_ID_QDM2,
    CODEC_ID_COOK, CODEC_ID_TRUESPEECH, CODEC_ID_TTA, CODEC_ID_SMACKAUDIO,
    CODEC_ID_QCELP, CODEC_ID_WAVPACK,
    //* subtitle codecs */
    CODEC_ID_DVD_SUBTITLE= $17000, CODEC_ID_DVB_SUBTITLE,

    CODEC_ID_MPEG2TS= $20000 //* _FAKE_ codec to indicate a raw MPEG2 transport
                              //  stream (only used by libavformat) */
  );

//* CODEC_ID_MP3LAME is absolete */
const
  CODEC_ID_MP3LAME = CODEC_ID_MP3;

  AVPALETTE_SIZE = 1024;
  AVPALETTE_COUNT = 256;

type
  TCodecType = (
    CODEC_TYPE_UNKNOWN = -1,
    CODEC_TYPE_VIDEO,
    CODEC_TYPE_AUDIO,
    CODEC_TYPE_DATA,
    CODEC_TYPE_SUBTITLE,
	CODEC_TYPE_NB    (* CAT#3 *)
  );

//* currently unused, may be used if 24/32 bits samples ever supported */
//* all in native endian */
  TSampleFormat = (
    SAMPLE_FMT_NONE = -1,
    SAMPLE_FMT_U8,              ///< unsigned 8 bits
    SAMPLE_FMT_S16,             ///< signed 16 bits
    SAMPLE_FMT_S24,             ///< signed 24 bits
    SAMPLE_FMT_S32,             ///< signed 32 bits
    SAMPLE_FMT_FLT             ///< float
  );

const
//* in bytes */
  AVCODEC_MAX_AUDIO_FRAME_SIZE = 192000; // 1 second of 48khz 32bit audio

(**
 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
 * this is mainly needed because some optimized bitstream readers read
 * 32 or 64 bit at once and could read over the end<br>
 * Note, if the first 23 bits of the additional bytes are not 0 then damaged
 * MPEG bitstreams could cause overread and segfault
 *)
  FF_INPUT_BUFFER_PADDING_SIZE = 8;

(**
 * minimum encoding buffer size.
 * used to avoid some checks during header writing
 *)
  FF_MIN_BUFFER_SIZE = 16384;

type
//* motion estimation type, EPZS by default */
  TMotion_Est_ID = (
    ME_ZERO = 1,
    ME_FULL,
    ME_LOG,
    ME_PHODS,
    ME_EPZS,
    ME_X1,
    ME_HEX,
    ME_UMH,
    ME_ITER
  );

  TAVDiscard = (
//we leave some space between them for extensions (drop some keyframes for intra only or drop just some bidir frames)
    AVDISCARD_NONE   = -16, ///< discard nothing
    AVDISCARD_DEFAULT=  0, ///< discard useless packets like 0 size packets in avi
    AVDISCARD_NONREF =  8, ///< discard all non reference
    AVDISCARD_BIDIR  = 16, ///< discard all bidirectional frames
    AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
    AVDISCARD_ALL    = 48, ///< discard all
    AVDISCARD_FUCK = $FFFFFF
  );

  PRcOverride = ^TRcOverride;
  TRcOverride = record {16}
    start_frame: integer;
    end_frame: integer;
    qscale: integer; // if this is 0 then quality_factor will be used instead
    quality_factor: single;
  end;

const
  FF_MAX_B_FRAMES = 16;

(* encoding support
   these flags can be passed in AVCodecContext.flags before initing
   Note: not everything is supported yet.
*)

  CODEC_FLAG_QSCALE = $0002;  ///< use fixed qscale
  CODEC_FLAG_4MV    = $0004;  ///< 4 MV per MB allowed / Advanced prediction for H263
  CODEC_FLAG_QPEL   = $0010;  ///< use qpel MC
  CODEC_FLAG_GMC    = $0020;  ///< use GMC
  CODEC_FLAG_MV0    = $0040;  ///< always try a MB with MV=<0,0>
  CODEC_FLAG_PART   = $0080;  ///< use data partitioning
//* parent program gurantees that the input for b-frame containing streams is not written to
//   for at least s->max_b_frames+1 frames, if this is not set than the input will be copied */
  CODEC_FLAG_INPUT_PRESERVED = $0100;
  CODEC_FLAG_PASS1 = $0200;   ///< use internal 2pass ratecontrol in first  pass mode
  CODEC_FLAG_PASS2 = $0400;   ///< use internal 2pass ratecontrol in second pass mode
  CODEC_FLAG_EXTERN_HUFF = $1000; ///< use external huffman table (for mjpeg)
  CODEC_FLAG_GRAY  = $2000;   ///< only decode/encode grayscale
  CODEC_FLAG_EMU_EDGE = $4000; ///< don't draw edges
  CODEC_FLAG_PSNR           = $8000; ///< error[?] variables will be set during encoding
  CODEC_FLAG_TRUNCATED  = $00010000; //** input bitstream might be truncated at a random location instead
                                   //         of only at frame boundaries */
  CODEC_FLAG_NORMALIZE_AQP  = $00020000; ///< normalize adaptive quantization
  CODEC_FLAG_INTERLACED_DCT = $00040000; ///< use interlaced dct
  CODEC_FLAG_LOW_DELAY      = $00080000; ///< force low delay
  CODEC_FLAG_ALT_SCAN       = $00100000; ///< use alternate scan
  CODEC_FLAG_TRELLIS_QUANT  = $00200000; ///< use trellis quantization
  CODEC_FLAG_GLOBAL_HEADER  = $00400000; ///< place global headers in extradata instead of every keyframe
  CODEC_FLAG_BITEXACT       = $00800000; ///< use only bitexact stuff (except (i)dct)
//* Fx : Flag for h263+ extra options */
  CODEC_FLAG_H263P_AIC      = $01000000; ///< H263 Advanced intra coding / MPEG4 AC prediction (remove this)
  CODEC_FLAG_AC_PRED        = $01000000; ///< H263 Advanced intra coding / MPEG4 AC prediction
  CODEC_FLAG_H263P_UMV      = $02000000; ///< Unlimited motion vector
  CODEC_FLAG_CBP_RD         = $04000000; ///< use rate distortion optimization for cbp
  CODEC_FLAG_QP_RD          = $08000000; ///< use rate distortion optimization for qp selectioon
  CODEC_FLAG_H263P_AIV      = $00000008; ///< H263 Alternative inter vlc
  CODEC_FLAG_OBMC           = $00000001; ///< OBMC
  CODEC_FLAG_LOOP_FILTER    = $00000800; ///< loop filter
  CODEC_FLAG_H263P_SLICE_STRUCT = $10000000;
  CODEC_FLAG_INTERLACED_ME  = $20000000; ///< interlaced motion estimation
  CODEC_FLAG_SVCD_SCAN_OFFSET = $40000000; ///< will reserve space for SVCD scan offset user data
  CODEC_FLAG_CLOSED_GOP     = $80000000;
  CODEC_FLAG2_FAST          = $00000001; ///< allow non spec compliant speedup tricks
  CODEC_FLAG2_STRICT_GOP    = $00000002; ///< strictly enforce GOP size
  CODEC_FLAG2_NO_OUTPUT     = $00000004; ///< skip bitstream encoding
  CODEC_FLAG2_LOCAL_HEADER  = $00000008; ///< place global headers at every keyframe instead of in extradata
  CODEC_FLAG2_BPYRAMID      = $00000010; ///< H.264 allow b-frames to be used as references
  CODEC_FLAG2_WPRED         = $00000020; ///< H.264 weighted biprediction for b-frames
  CODEC_FLAG2_MIXED_REFS    = $00000040; ///< H.264 multiple references per partition
  CODEC_FLAG2_8X8DCT        = $00000080; ///< H.264 high profile 8x8 transform
  CODEC_FLAG2_FASTPSKIP     = $00000100; ///< H.264 fast pskip
  CODEC_FLAG2_AUD           = $00000200; ///< H.264 access unit delimiters
  CODEC_FLAG2_BRDO          = $00000400; ///< b-frame rate-distortion optimization
  CODEC_FLAG2_INTRA_VLC     = $00000800; ///< use MPEG-2 intra VLC table
  CODEC_FLAG2_MEMC_ONLY     = $00001000; ///< only do ME/MC (I frames -> ref, P frame -> ME+MC)

(* Unsupported options :
 *              Syntax Arithmetic coding (SAC)
 *              Reference Picture Selection
 *              Independant Segment Decoding */
/* /Fx */
/* codec capabilities *)

const
  CODEC_CAP_DRAW_HORIZ_BAND = $001; ///< decoder can use draw_horiz_band callback
(**
 * Codec uses get_buffer() for allocating buffers.
 * direct rendering method 1 *)
  CODEC_CAP_DR1             = $002;
(* if 'parse_only' field is true, then avcodec_parse_frame() can be   used *)
  CODEC_CAP_PARSE_ONLY      = $004;
  CODEC_CAP_TRUNCATED       = $008;
//* codec can export data for HW decoding (XvMC) */
  CODEC_CAP_HWACCEL         = $010;

(**
 * codec has a non zero delay and needs to be feeded with NULL at the end to get the delayed data.
 * if this is not set, the codec is guranteed to never be feeded with NULL data *)
  CODEC_CAP_DELAY           = $0020;
(**
 * Codec can be fed a final frame with a smaller size.
 * This can be used to prevent truncation of the last audio samples. *)
  CODEC_CAP_SMALL_LAST_FRAME = $0040;

//the following defines may change, don't expect compatibility if you use them
   MB_TYPE_INTRA4x4   = $001;
   MB_TYPE_INTRA16x16 = $002; //FIXME h264 specific
   MB_TYPE_INTRA_PCM  = $004; //FIXME h264 specific
   MB_TYPE_16x16      = $008;
   MB_TYPE_16x8       = $010;
   MB_TYPE_8x16       = $020;
   MB_TYPE_8x8        = $040;
   MB_TYPE_INTERLACED = $080;
   MB_TYPE_DIRECT2     = $100; //FIXME
   MB_TYPE_ACPRED     = $200;
   MB_TYPE_GMC        = $400;
   MB_TYPE_SKIP       = $800;
   MB_TYPE_P0L0       = $1000;
   MB_TYPE_P1L0       = $2000;
   MB_TYPE_P0L1       = $4000;
   MB_TYPE_P1L1       = $8000;
   MB_TYPE_L0         = (MB_TYPE_P0L0 or MB_TYPE_P1L0);
   MB_TYPE_L1         = (MB_TYPE_P0L1 or MB_TYPE_P1L1);
   MB_TYPE_L0L1       = (MB_TYPE_L0   or MB_TYPE_L1);
   MB_TYPE_QUANT      = $0010000;
   MB_TYPE_CBP        = $0020000;
//Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)

type
(**
 * Pan Scan area.
 * this specifies the area which should be displayed. Note there may be multiple such areas for one frame *)
  PAVPanScan = ^TAVPanScan;
  TAVPanScan = record {24}
    (*** id.
     * - encoding: set by user.
     * - decoding: set by lavc     *)
    id: integer;

    (*** width and height in 1/16 pel
     * - encoding: set by user.
     * - decoding: set by lavc     *)
    width: integer;
    height: integer;

    (*** position of the top left corner in 1/16 pel for up to 3 fields/frames.
     * - encoding: set by user.
     * - decoding: set by lavc     *)
    position: array [0..2] of array [0..1] of smallint;
  end;

const
  FF_QSCALE_TYPE_MPEG1	= 0;
  FF_QSCALE_TYPE_MPEG2	= 1;

  FF_BUFFER_TYPE_INTERNAL = 1;
  FF_BUFFER_TYPE_USER     = 2; ///< Direct rendering buffers (image is (de)allocated by user)
  FF_BUFFER_TYPE_SHARED   = 4; ///< buffer from somewhere else, don't dealloc image (data/base), all other tables are not shared
  FF_BUFFER_TYPE_COPY     = 8; ///< just a (modified) copy of some other buffer, don't dealloc anything


  FF_I_TYPE = 1; // Intra
  FF_P_TYPE = 2; // Predicted
  FF_B_TYPE = 3; // Bi-dir predicted
  FF_S_TYPE = 4; // S(GMC)-VOP MPEG4
  FF_SI_TYPE = 5;
  FF_SP_TYPE = 6;

  FF_BUFFER_HINTS_VALID    = $01; // Buffer hints value is meaningful (if 0 ignore)
  FF_BUFFER_HINTS_READABLE = $02; // Codec will read from buffer
  FF_BUFFER_HINTS_PRESERVE = $04; // User must not alter buffer content
  FF_BUFFER_HINTS_REUSABLE = $08; // Codec will reuse the buffer (update)

type
  (*** Audio Video Frame. *)
  PAVFrame = ^TAVFrame;
  TAVFrame = record {200}
    (*** pointer to the picture planes.
     * this might be different from the first allocated byte *)
    data: array [0..3] of pbyte;
    linesize: array [0..3] of integer;
    (*** pointer to the first allocated byte of the picture. can be used in get_buffer/release_buffer
     * this isn't used by lavc unless the default get/release_buffer() is used*)
    base: array [0..3] of pbyte;
    (*** 1 -> keyframe, 0-> not *)
    key_frame: integer;
    (*** picture type of the frame, see ?_TYPE below.*)
    pict_type: integer;
    (*** presentation timestamp in time_base units (time when frame should be shown to user)
     * if AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed*)
    pts: int64;
    (*** picture number in bitstream order.*)
    coded_picture_number: integer;
    (*** picture number in display order.*)
    display_picture_number: integer;
    (*** quality (between 1 (good) and FF_LAMBDA_MAX (bad)) *)
    quality: integer;
    (*** buffer age (1->was last buffer and dint change, 2->..., ...).*)
    age: integer;
    (*** is this picture used as reference*)
    reference: integer;
    (*** QP table*)
    qscale_table: pchar;
    (*** QP store stride*)
    qstride: integer;
    (*** mbskip_table[mb]>=1 if MB didnt change*)
    mbskip_table: pbyte;
    (**
     * Motion vector table.
     * @code
     * example:
     * int mv_sample_log2= 4 - motion_subsample_log2;
     * int mb_width= (width+15)>>4;
     * int mv_stride= (mb_width << mv_sample_log2) + 1;
     * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
     * @endcode
     * - encoding: set by user
     * - decoding: set by lavc     *)
    motion_val: array [0..1] of pointer;
    (*** Macroblock type table
     * mb_type_base + mb_width + 2 *)
    mb_type: PCardinal;
    (*** log2 of the size of the block which a single vector in motion_val represents:
     * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)*)
    motion_subsample_log2: byte;
    (*** for some private data of the user*)
    opaque: pointer;
    (*** error*)
    error: array [0..3] of int64;
    (*** type of the buffer (to keep track of who has to dealloc data[*])
     * Note: user allocated (direct rendering) & internal buffers can not coexist currently*)
    _type: integer;
    (*** when decoding, this signal how much the picture must be delayed.
     * extra_delay = repeat_pict / (2*fps)*)
    repeat_pict: integer;
    qscale_type: integer;
    (*** The content of the picture is interlaced.*)
    interlaced_frame: integer;
    (*** if the content is interlaced, is top field displayed first.*)
    top_field_first: integer;
    (*** Pan scan.*)
    pan_scan: PAVPanScan;
    (*** tell user application that palette has changed from previous frame.*)
    palette_has_changed: integer;
    (*** Codec suggestion on buffer type if != 0
     * - decoding: set by lavc (before get_buffer() call))*)
    buffer_hints: integer;
    (*** DCT coeffitients*)
    dct_coeff: PsmallInt;
    (*** Motion referece frame index*)
    ref_index: array [0..1] of pshortint;
  end;

const
  DEFAULT_FRAME_RATE_BASE = 1001000;

  FF_BUG_AUTODETECT       = 1;  ///< autodetection
  FF_BUG_OLD_MSMPEG4      = 2;
  FF_BUG_XVID_ILACE       = 4;
  FF_BUG_UMP4             = 8;
  FF_BUG_NO_PADDING       = 16;
  FF_BUG_AMV              = 32;
  FF_BUG_AC_VLC           = 0;  ///< will be removed, libavcodec can now handle these non compliant files by default
  FF_BUG_QPEL_CHROMA      = 64;
  FF_BUG_STD_QPEL         = 128;
  FF_BUG_QPEL_CHROMA2     = 256;
  FF_BUG_DIRECT_BLOCKSIZE = 512;
  FF_BUG_EDGE             = 1024;
  FF_BUG_HPEL_CHROMA      = 2048;
  FF_BUG_DC_CLIP          = 4096;
  FF_BUG_MS               = 8192; ///< workaround various bugs in microsofts broken decoders

  FF_COMPLIANCE_VERY_STRICT   = 2; ///< strictly conform to a older more strict version of the spec or reference software
  FF_COMPLIANCE_STRICT        = 1; ///< strictly conform to all the things in the spec no matter what consequences
  FF_COMPLIANCE_NORMAL        = 0;
  FF_COMPLIANCE_INOFFICIAL    = -1; ///< allow inofficial extensions
  FF_COMPLIANCE_EXPERIMENTAL  = -2; ///< allow non standarized experimental things

  FF_ER_CAREFUL         = 1;
  FF_ER_COMPLIANT       = 2;
  FF_ER_AGGRESSIVE      = 3;
  FF_ER_VERY_AGGRESSIVE = 4;

  FF_DCT_AUTO    = 0;
  FF_DCT_FASTINT = 1;
  FF_DCT_INT     = 2;
  FF_DCT_MMX     = 3;
  FF_DCT_MLIB    = 4;
  FF_DCT_ALTIVEC = 5;
  FF_DCT_FAAN    = 6;

  FF_IDCT_AUTO         = 0;
  FF_IDCT_INT          = 1;
  FF_IDCT_SIMPLE       = 2;
  FF_IDCT_SIMPLEMMX    = 3;
  FF_IDCT_LIBMPEG2MMX  = 4;
  FF_IDCT_PS2          = 5;
  FF_IDCT_MLIB         = 6;
  FF_IDCT_ARM          = 7;
  FF_IDCT_ALTIVEC      = 8;
  FF_IDCT_SH4          = 9;
  FF_IDCT_SIMPLEARM    = 10;
  FF_IDCT_H264         = 11;
  FF_IDCT_VP3          = 12;
  FF_IDCT_IPP          = 13;
  FF_IDCT_XVIDMMX      = 14;

  FF_EC_GUESS_MVS   = 1;
  FF_EC_DEBLOCK     = 2;

  FF_MM_FORCE	      = $80000000; (* force usage of selected flags (OR) *)
    (* lower 16 bits - CPU features *)

  FF_MM_MMX	        = $0001; (* standard MMX *)
  FF_MM_3DNOW	      = $0004; (* AMD 3DNOW *)
  FF_MM_MMXEXT	    = $0002; (* SSE integer functions or AMD MMX ext *)
  FF_MM_SSE	        = $0008; (* SSE functions *)
  FF_MM_SSE2	      = $0010; (* PIV SSE2 functions *)
  FF_MM_3DNOWEXT	  = $0020; (* AMD 3DNowExt *)
  FF_MM_IWMMXT	    = $0100; (* XScale IWMMXT *)

  FF_PRED_LEFT   = 0;
  FF_PRED_PLANE  = 1;
  FF_PRED_MEDIAN = 2;

  FF_DEBUG_PICT_INFO    = 1;
  FF_DEBUG_RC           = 2;
  FF_DEBUG_BITSTREAM    = 4;
  FF_DEBUG_MB_TYPE      = 8;
  FF_DEBUG_QP           = 16;
  FF_DEBUG_MV           = 32;
  FF_DEBUG_DCT_COEFF    = $00000040;
  FF_DEBUG_SKIP         = $00000080;
  FF_DEBUG_STARTCODE    = $00000100;
  FF_DEBUG_PTS          = $00000200;
  FF_DEBUG_ER           = $00000400;
  FF_DEBUG_MMCO         = $00000800;
  FF_DEBUG_BUGS         = $00001000;
  FF_DEBUG_VIS_QP       = $00002000;
  FF_DEBUG_VIS_MB_TYPE  = $00004000;

  FF_DEBUG_VIS_MV_P_FOR  = $00000001; //visualize forward predicted MVs of P frames
  FF_DEBUG_VIS_MV_B_FOR  = $00000002; //visualize forward predicted MVs of B frames
  FF_DEBUG_VIS_MV_B_BACK = $00000004; //visualize backward predicted MVs of B frames

  FF_CMP_SAD  = 0;
  FF_CMP_SSE  = 1;
  FF_CMP_SATD = 2;
  FF_CMP_DCT  = 3;
  FF_CMP_PSNR = 4;
  FF_CMP_BIT  = 5;
  FF_CMP_RD   = 6;
  FF_CMP_ZERO = 7;
  FF_CMP_VSAD = 8;
  FF_CMP_VSSE = 9;
  FF_CMP_NSSE = 10;
  FF_CMP_W53  = 11;
  FF_CMP_W97  = 12;
  FF_CMP_DCTMAX = 13;
  FF_CMP_CHROMA = 256;

  FF_DTG_AFD_SAME         = 8;
  FF_DTG_AFD_4_3          = 9;
  FF_DTG_AFD_16_9         = 10;
  FF_DTG_AFD_14_9         = 11;
  FF_DTG_AFD_4_3_SP_14_9  = 13;
  FF_DTG_AFD_16_9_SP_14_9 = 14;
  FF_DTG_AFD_SP_4_3       = 15;

  FF_DEFAULT_QUANT_BIAS   = 999999;

  FF_LAMBDA_SHIFT   = 7;
  FF_LAMBDA_SCALE   = (1 shl FF_LAMBDA_SHIFT);
  FF_QP2LAMBDA      = 118; ///< factor to convert from H.263 QP to lambda
  FF_LAMBDA_MAX     = (256 * 128 - 1);

  FF_QUALITY_SCALE  = FF_LAMBDA_SCALE; //FIXME maybe remove

  FF_CODER_TYPE_VLC   = 0;
  FF_CODER_TYPE_AC    = 1;

  SLICE_FLAG_CODED_ORDER    = $0001; ///< draw_horiz_band() is called in coded order instead of display
  SLICE_FLAG_ALLOW_FIELD    = $0002; ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
  SLICE_FLAG_ALLOW_PLANE    = $0004; ///< allow draw_horiz_band() with 1 component at a time (SVQ1)

  FF_MB_DECISION_SIMPLE = 0;        ///< uses mb_cmp
  FF_MB_DECISION_BITS   = 1;        ///< chooses the one which needs the fewest bits
  FF_MB_DECISION_RD     = 2;        ///< rate distoration

  FF_AA_AUTO    = 0;
  FF_AA_FASTINT = 1; //not implemented yet
  FF_AA_INT     = 2;
  FF_AA_FLOAT   = 3;

  FF_PROFILE_UNKNOWN  = -99;

  FF_LEVEL_UNKNOWN    = -99;

  X264_PART_I4X4 = $001;  (* Analyse i4x4 *)
  X264_PART_I8X8 = $002;  (* Analyse i8x8 (requires 8x8 transform) *)
  X264_PART_P8X8 = $010;  (* Analyse p16x8, p8x16 and p8x8 *)
  X264_PART_P4X4 = $020;  (* Analyse p8x4, p4x8, p4x4 *)
  X264_PART_B8X8 = $100;  (* Analyse b16x8, b8x16 and b8x8 *)

type
  PAVClass = ^TAVClass;
  PAVCodecContext = ^TAVCodecContext;
  PAVCodec = ^TAVCodec;
  PAVPaletteControl = ^TAVPaletteControl;

  TAVclass = record {12}
    class_name: pchar;
    (* actually passing a pointer to an AVCodecContext
					or AVFormatContext, which begin with an AVClass.
					Needed because av_log is in libavcodec and has no visibility
					of AVIn/OutputFormat *)
    item_name: function (): pchar; cdecl;
    option: PAVOption;
  end;

  TAVCodecContext = record {720}
    (*** Info on struct for av_log
     * - set by avcodec_alloc_context     *)
    av_class: PAVClass;
    (*** the average bitrate.
     * - encoding: set by user. unused for constant quantizer encoding
     * - decoding: set by lavc. 0 or some bitrate if this info is available in the stream     *)
    bit_rate: integer;
    (*** number of bits the bitstream is allowed to diverge from the reference.
     *           the reference can be CBR (for CBR pass1) or VBR (for pass2)
     * - encoding: set by user. unused for constant quantizer encoding
     * - decoding: unused     *)
    bit_rate_tolerance: integer;
    (*** CODEC_FLAG_*.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    flags: integer;
    (*** some codecs needs additionnal format info. It is stored here
     * - encoding: set by user.
     * - decoding: set by lavc. (FIXME is this ok?)     *)
    sub_id: integer;

    (**
     * motion estimation algorithm used for video coding.
     * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
     * 8 (umh), 9 (iter) [7, 8 are x264 specific, 9 is snow specific]
     * - encoding: MUST be set by user.
     * - decoding: unused     *)
    me_method: integer;

    (**
     * some codecs need / can use extra-data like huffman tables.
     * mjpeg: huffman tables
     * rv10: additional flags
     * mpeg4: global headers (they can be in the bitstream or here)
     * the allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
     * then extradata_size to avoid prolems if its read with the bitstream reader
     * the bytewise contents of extradata must not depend on the architecture or cpu endianness
     * - encoding: set/allocated/freed by lavc.
     * - decoding: set/allocated/freed by user.
     *)
    extradata: pbyte;
    extradata_size: integer;

    (**
     * this is the fundamental unit of time (in seconds) in terms
     * of which frame timestamps are represented. for fixed-fps content,
     * timebase should be 1/framerate and timestamp increments should be
     * identically 1.
     * - encoding: MUST be set by user
     * - decoding: set by lavc.     *)
    time_base: TAVRational;

    (* video only *)
    (*** picture width / height.
     * - encoding: MUST be set by user.
     * - decoding: set by lavc.
     * Note, for compatibility its possible to set this instead of
     * coded_width/height before decoding     *)
    width, height: integer;
    (*** the number of pictures in a group of pitures, or 0 for intra_only.
     * - encoding: set by user.
     * - decoding: unused     *)
    gop_size: integer;
    (*** pixel format, see PIX_FMT_xxx.
     * - encoding: set by user.
     * - decoding: set by lavc.     *)
    pix_fmt: TAVPixelFormat;
    (*** Frame rate emulation. If not zero lower layer (i.e. format handler)
     * has to read frames at native frame rate.
     * - encoding: set by user.
     * - decoding: unused.     *)
    rate_emu: integer;
    (*** if non NULL, 'draw_horiz_band' is called by the libavcodec
     * decoder to draw an horizontal band. It improve cache usage. Not
     * all codecs can do that. You must check the codec capabilities
     * before
     * - encoding: unused
     * - decoding: set by user.
     * @param height the height of the slice
     * @param y the y position of the slice
     * @param type 1->top field, 2->bottom field, 3->frame
     * @param offset offset into the AVFrame.data from which the slice should be read *)
    draw_horiz_band: procedure (s: PAVCodecContext;
                                const src: PAVFrame; offset: PInteger;
                                y: integer; _type: integer; height: integer); cdecl;

    (* audio only *)
    sample_rate: integer; ///< samples per sec
    channels: integer;
    (*** audio sample format.
     * - encoding: set by user.
     * - decoding: set by lavc.     *)
    sample_fmt: TSampleFormat;  ///< sample format, currenly unused

    (* the following data should not be initialized *)
    (*** samples per packet. initialized when calling 'init'     *)
    frame_size: integer;
    frame_number: integer;   ///< audio or video frame number
    real_pict_num: integer;  ///< returns the real picture number of previous encoded frame

    (*** number of frames the decoded output will be delayed relative to
     * the encoded input.
     * - encoding: set by lavc.
     * - decoding: unused     *)
    delay: integer;

    (* - encoding parameters *)
    qcompress: single;  ///< amount of qscale change between easy & hard scenes (0.0-1.0)
    qblur: single;      ///< amount of qscale smoothing over time (0.0-1.0)

    (*** minimum quantizer.
     * - encoding: set by user.
     * - decoding: unused     *)
    qmin: integer;

    (*** maximum quantizer.
     * - encoding: set by user.
     * - decoding: unused     *)
    qmax: integer;

    (*** maximum quantizer difference etween frames.
     * - encoding: set by user.
     * - decoding: unused     *)
    max_qdiff: integer;

    (*** maximum number of b frames between non b frames.
     * note: the output will be delayed by max_b_frames+1 relative to the input
     * - encoding: set by user.
     * - decoding: unused     *)
    max_b_frames: integer;

    (*** qscale factor between ip and b frames.
     * - encoding: set by user.
     * - decoding: unused     *)
    b_quant_factor: single;

    (** obsolete FIXME remove *)
    rc_strategy: integer;
    b_frame_strategy: integer;

    (*** hurry up amount.
     * deprecated in favor of skip_idct and skip_frame
     * - encoding: unused
     * - decoding: set by user. 1-> skip b frames, 2-> skip idct/dequant too, 5-> skip everything except header     *)
    hurry_up: integer;

    codec: PAVCodec;

    priv_data: pointer;

    (* unused, FIXME remove*)
    rtp_mode: integer;

    rtp_payload_size: integer;  (* The size of the RTP payload: the coder will  *)
                                (* do it's best to deliver a chunk with size    *)
                                (* below rtp_payload_size, the chunk will start *)
                                (* with a start code on some codecs like H.263  *)
                                (* This doesn't take account of any particular  *)
                                (* headers inside the transmited RTP payload    *)


    (* The RTP callback: This function is called   *)
    (* every time the encoder has a packet to send *)
    (* Depends on the encoder if the data starts   *)
    (* with a Start Code (it should) H.263 does.   *)
    (* mb_nb contains the number of macroblocks    *)
    (* encoded in the RTP payload                  *)
    rtp_callback: procedure (avctx: PAVCodecContext; data: pointer;
                             size: integer; mb_nb: integer); cdecl;

    (* statistics, used for 2-pass encoding *)
    mv_bits: integer;
    header_bits: integer;
    i_tex_bits: integer;
    p_tex_bits: integer;
    i_count: integer;
    p_count: integer;
    skip_count: integer;
    misc_bits: integer;

    (*** number of bits used for the previously encoded frame.
     * - encoding: set by lavc
     * - decoding: unused     *)
    frame_bits: integer;

    (*** private data of the user, can be used to carry app specific stuff.
     * - encoding: set by user
     * - decoding: set by user     *)
    opaque: pointer;

    codec_name: array [0..31] of char;
    codec_type: TCodecType; (* see CODEC_TYPE_xxx *)
    codec_id: TCodecID; (* see CODEC_ID_xxx *)

    (*** fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * this is used to workaround some encoder bugs
     * - encoding: set by user, if not then the default based on codec_id will be used
     * - decoding: set by user, will be converted to upper case by lavc during init     *)
    codec_tag: cardinal;  // ����� array [0..3] of char - ����� ����� FOURCC
//    codec_tag: array [0..3] of char; 

    (*** workaround bugs in encoders which sometimes cannot be detected automatically.
     * - encoding: set by user
     * - decoding: set by user     *)
    workaround_bugs: integer;

    (*** luma single coeff elimination threshold.
     * - encoding: set by user
     * - decoding: unused     *)
    luma_elim_threshold: integer;

    (*** chroma single coeff elimination threshold.
     * - encoding: set by user
     * - decoding: unused     *)
    chroma_elim_threshold: integer;

    (*** strictly follow the std (MPEG4, ...).
     * - encoding: set by user
     * - decoding: unused     *)
    strict_std_compliance: integer;

    (*** qscale offset between ip and b frames.
     * if > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset)
     * if < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset)
     * - encoding: set by user.
     * - decoding: unused     *)
    b_quant_offset: single;

    (*** error resilience higher values will detect more errors but may missdetect
     * some more or less valid parts as errors.
     * - encoding: unused
     * - decoding: set by user     *)
    error_resilience: integer;

    (*** called at the beginning of each frame to get a buffer for it.
     * if pic.reference is set then the frame will be read later by lavc
     * avcodec_align_dimensions() should be used to find the required width and
     * height, as they normally need to be rounded up to the next multiple of 16
     * - encoding: unused
     * - decoding: set by lavc, user can override     *)
    get_buffer: function (c: PAVCodecContext; pic: PAVFrame): integer; cdecl;

    (*** called to release buffers which where allocated with get_buffer.
     * a released buffer can be reused in get_buffer()
     * pic.data[*] must be set to NULL
     * - encoding: unused
     * - decoding: set by lavc, user can override     *)
    release_buffer: procedure (c: PAVCodecContext; pic: PAVFrame); cdecl;

    (*** if 1 the stream has a 1 frame delay during decoding.
     * - encoding: set by lavc
     * - decoding: set by lavc     *)
    has_b_frames: integer;

    (*** number of bytes per packet if constant and known or 0
     * used by some WAV based audio codecs     *)
    block_align: integer;

    parse_only: integer; (* - decoding only: if true, only parsing is done
                       (function avcodec_parse_frame()). The frame
                       data is returned. Only MPEG codecs support this now. *)

    (*** 0-> h263 quant 1-> mpeg quant.
     * - encoding: set by user.
     * - decoding: unused     *)
    mpeg_quant: integer;

    (*** pass1 encoding statistics output buffer.
     * - encoding: set by lavc
     * - decoding: unused     *)
    stats_out: pchar;

    (*** pass2 encoding statistics input buffer.
     * concatenated stuff from stats_out of pass1 should be placed here
     * - encoding: allocated/set/freed by user
     * - decoding: unused     *)
    stats_in: pchar;

    (*** ratecontrol qmin qmax limiting method.
     * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_qsquish: single;

    rc_qmod_amp: single;
    rc_qmod_freq: integer;

    (*** ratecontrol override, see RcOverride.
     * - encoding: allocated/set/freed by user.
     * - decoding: unused     *)
    rc_override: PRcOverride;
    rc_override_count: integer;

    (*** rate control equation.
     * - encoding: set by user
     * - decoding: unused     *)
    rc_eq: pchar;

    (*** maximum bitrate.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_max_rate: integer;

    (*** minimum bitrate.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_min_rate: integer;

    (*** decoder bitstream buffer size.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_buffer_size: integer;
    rc_buffer_aggressivity: single;

    (*** qscale factor between p and i frames.
     * if > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset)
     * if < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset)
     * - encoding: set by user.
     * - decoding: unused     *)
    i_quant_factor: single;

    (*** qscale offset between p and i frames.
     * - encoding: set by user.
     * - decoding: unused     *)
    i_quant_offset: single;

    (*** initial complexity for pass1 ratecontrol.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_initial_cplx: single;

    (*** dct algorithm, see FF_DCT_* below.
     * - encoding: set by user
     * - decoding: unused     *)
    dct_algo: integer;

    (*** luminance masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    lumi_masking: single;

    (*** temporary complexity masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    temporal_cplx_masking: single;

    (*** spatial complexity masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    spatial_cplx_masking: single;

    (**     * p block masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    p_masking: single;

    (*** darkness masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    dark_masking: single;

    (* for binary compatibility *)
    unused: integer;

    (*** idct algorithm, see FF_IDCT_* below.
     * - encoding: set by user
     * - decoding: set by user     *)
    idct_algo: integer;

    (*** slice count.
     * - encoding: set by lavc
     * - decoding: set by user (or 0)     *)
    slice_count: integer;

    (*** slice offsets in the frame in bytes.
     * - encoding: set/allocated by lavc
     * - decoding: set/allocated by user (or NULL)     *)
    slice_offset: Pinteger;

    (*** error concealment flags.
     * - encoding: unused
     * - decoding: set by user     *)
    error_concealment: integer;

    (*** dsp_mask could be add used to disable unwanted CPU features
     * CPU features (i.e. MMX, SSE. ...)
     *
     * with FORCE flag you may instead enable given CPU features
     * (Dangerous: usable in case of misdetection, improper usage however will
     * result into program crash)     *)
    dsp_mask: cardinal;

    (*** bits per sample/pixel from the demuxer (needed for huffyuv).
     * - encoding: set by lavc
     * - decoding: set by user     *)
     bits_per_sample: integer;

    (*** prediction method (needed for huffyuv).
     * - encoding: set by user
     * - decoding: unused     *)
     prediction_method: integer;

    (*** sample aspect ratio (0 if unknown).
     * numerator and denominator must be relative prime and smaller then 256 for some video standards
     * - encoding: set by user.
     * - decoding: set by lavc.     *)
    sample_aspect_ratio: TAVRational;

    (*** the picture in the bitstream.
     * - encoding: set by lavc
     * - decoding: set by lavc     *)
    coded_frame: PAVFrame;

    (*** debug.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    debug: integer;

    (*** debug.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    debug_mv: integer;

    (** error.
     * - encoding: set by lavc if flags&CODEC_FLAG_PSNR
     * - decoding: unused     *)
    error: array [0..3] of int64;

    (*** minimum MB quantizer.
     * - encoding: unused
     * - decoding: unused     *)
    mb_qmin: integer;

    (*** maximum MB quantizer.
     * - encoding: unused
     * - decoding: unused     *)
    mb_qmax: integer;

    (*** motion estimation compare function.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_cmp: integer;

    (*** subpixel motion estimation compare function.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_sub_cmp: integer;
    (*** macroblock compare function (not supported yet).
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_cmp: integer;
    (*** interlaced dct compare function
     * - encoding: set by user.
     * - decoding: unused     *)
    ildct_cmp: integer;
    (*** ME diamond size & shape.
     * - encoding: set by user.
     * - decoding: unused     *)
    dia_size: integer;

    (*** amount of previous MV predictors (2a+1 x 2a+1 square).
     * - encoding: set by user.
     * - decoding: unused     *)
    last_predictor_count: integer;

    (*** pre pass for motion estimation.
     * - encoding: set by user.
     * - decoding: unused     *)
    pre_me: integer;

    (*** motion estimation pre pass compare function.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_pre_cmp: integer;

    (*** ME pre pass diamond size & shape.
     * - encoding: set by user.
     * - decoding: unused     *)
    pre_dia_size: integer;

    (*** subpel ME quality.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_subpel_quality: integer;

    (*** callback to negotiate the pixelFormat.
     * @param fmt is the list of formats which are supported by the codec,
     * its terminated by -1 as 0 is a valid format, the formats are ordered by quality
     * the first is allways the native one
     * @return the choosen format
     * - encoding: unused
     * - decoding: set by user, if not set then the native format will always be choosen
     *)
    get_format: function (s: PAVCodecContext; const fmt: PAVPixelFormat): TAVPixelFormat; cdecl;

    (*** DTG active format information (additionnal aspect ratio
     * information only used in DVB MPEG2 transport streams). 0 if
     * not set.
     * - encoding: unused.
     * - decoding: set by decoder     *)
    dtg_active_format: integer;

    (*** Maximum motion estimation search range in subpel units.
     * if 0 then no limit
     * - encoding: set by user.
     * - decoding: unused.     *)
    me_range: integer;

    (*** intra quantizer bias.
     * - encoding: set by user.
     * - decoding: unused     *)
    intra_quant_bias: integer;

    (*** inter quantizer bias.
     * - encoding: set by user.
     * - decoding: unused     *)
    inter_quant_bias: integer;

    (*** color table ID.
     * - encoding: unused.
     * - decoding: which clrtable should be used for 8bit RGB images
     *             table have to be stored somewhere FIXME     *)
    color_table_id: integer;

    (*** internal_buffer count.
     * Don't touch, used by lavc default_get_buffer()     *)
    internal_buffer_count: integer;

    (*** internal_buffers.
     * Don't touch, used by lavc default_get_buffer()     *)
    internal_buffer: pointer;

    (*** global quality for codecs which cannot change it per frame.
     * this should be proportional to MPEG1/2/4 qscale.
     * - encoding: set by user.
     * - decoding: unused     *)
    global_quality: integer;

    (*** coder type
     * - encoding: set by user.
     * - decoding: unused     *)
    coder_type: integer;

    (*** context model
     * - encoding: set by user.
     * - decoding: unused     *)
    context_model: integer;

    (*** slice flags
     * - encoding: unused
     * - decoding: set by user.     *)
    slice_flags: integer;

    (*** XVideo Motion Acceleration
     * - encoding: forbidden
     * - decoding: set by decoder     *)
    xvmc_acceleration: integer;

    (*** macroblock decision mode
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_decision: integer;

    (*** custom intra quantization matrix
     * - encoding: set by user, can be NULL
     * - decoding: set by lavc     *)
    intra_matrix: Pword;

    (*** custom inter quantization matrix
     * - encoding: set by user, can be NULL
     * - decoding: set by lavc     *)
    inter_matrix: Pword;

    (*** fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * this is used to workaround some encoder bugs
     * - encoding: unused
     * - decoding: set by user, will be converted to upper case by lavc during init     *)
    stream_codec_tag: array [0..3] of char; //cardinal;

    (*** scene change detection threshold.
     * 0 is default, larger means fewer detected scene changes
     * - encoding: set by user.
     * - decoding: unused     *)
    scenechange_threshold: integer;

    (*** minimum lagrange multipler
     * - encoding: set by user.
     * - decoding: unused     *)
    lmin: integer;

    (*** maximum lagrange multipler
     * - encoding: set by user.
     * - decoding: unused     *)
    lmax: integer;

    (*** Palette control structure
     * - encoding: ??? (no palette-enabled encoder yet)
     * - decoding: set by user.     *)
    palctrl: PAVPaletteControl;

    (*** noise reduction strength
     * - encoding: set by user.
     * - decoding: unused     *)
    noise_reduction: integer;

    (*** called at the beginning of a frame to get cr buffer for it.
     * buffer type (size, hints) must be the same. lavc won't check it.
     * lavc will pass previous buffer in pic, function should return
     * same buffer or new buffer with old frame "painted" into it.
     * if pic.data[0] == NULL must behave like get_buffer().
     * - encoding: unused
     * - decoding: set by lavc, user can override     *)
    reget_buffer: function (c: PAVCodecContext; pic: PAVFrame): integer; cdecl;

    (*** number of bits which should be loaded into the rc buffer before decoding starts
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_initial_buffer_occupancy: integer;
    inter_threshold: integer;

    (*** CODEC_FLAG2_*.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    flags2: integer;

    (*** simulates errors in the bitstream to test error concealment.
     * - encoding: set by user.
     * - decoding: unused.     *)
    error_rate: integer;

    (*** MP3 antialias algorithm, see FF_AA_* below.
     * - encoding: unused
     * - decoding: set by user     *)
    antialias_algo: integer;

    (*** Quantizer noise shaping.
     * - encoding: set by user
     * - decoding: unused     *)
    quantizer_noise_shaping: integer;

    (*** Thread count.
     * is used to decide how many independant tasks should be passed to execute()
     * - encoding: set by user
     * - decoding: set by user     *)
    thread_count: integer;

    (*** the codec may call this to execute several independant things. it will return only after
     * finishing all tasks, the user may replace this with some multithreaded implementation, the
     * default implementation will execute the parts serially
     * @param count the number of things to execute
     * - encoding: set by lavc, user can override
     * - decoding: set by lavc, user can override     *)
    execute: function (c: PAVCodecContext; func: pointer; arg: PPointer; ret: PInteger; count: integer): integer; cdecl;

    (*** Thread opaque.
     * can be used by execute() to store some per AVCodecContext stuff.
     * - encoding: set by execute()
     * - decoding: set by execute()     *)
    thread_opaque: pointer;

    (*** Motion estimation threshold. under which no motion estimation is
     * performed, but instead the user specified motion vectors are used
     * - encoding: set by user
     * - decoding: unused     *)
     me_threshold: integer;

    (*** Macroblock threshold. under which the user specified macroblock types will be used
     * - encoding: set by user
     * - decoding: unused    *)
     mb_threshold: integer;

    (*** precision of the intra dc coefficient - 8.
     * - encoding: set by user
     * - decoding: unused     *)
     intra_dc_precision: integer;

    (*** noise vs. sse weight for the nsse comparsion function.
     * - encoding: set by user
     * - decoding: unused     *)
     nsse_weight: integer;

    (*** number of macroblock rows at the top which are skipped.
     * - encoding: unused
     * - decoding: set by user     *)
     skip_top: integer;

    (*** number of macroblock rows at the bottom which are skipped.
     * - encoding: unused
     * - decoding: set by user     *)
     skip_bottom: integer;

    (*** profile
     * - encoding: set by user
     * - decoding: set by lavc     *)
     profile: integer;

    (*** level
     * - encoding: set by user
     * - decoding: set by lavc     *)
     level: integer;

    (*** low resolution decoding. 1-> 1/2 size, 2->1/4 size
     * - encoding: unused
     * - decoding: set by user     *)
     lowres: integer;

    (*** bitsream width / height. may be different from width/height if lowres
     * or other things are used
     * - encoding: unused
     * - decoding: set by user before init if known, codec should override / dynamically change if needed     *)
    coded_width, coded_height: integer;

    (*** frame skip threshold
     * - encoding: set by user
     * - decoding: unused     *)
    frame_skip_threshold: integer;

    (*** frame skip factor
     * - encoding: set by user
     * - decoding: unused     *)
    frame_skip_factor: integer;

    (*** frame skip exponent
     * - encoding: set by user
     * - decoding: unused     *)
    frame_skip_exp: integer;

    (*** frame skip comparission function
     * - encoding: set by user.
     * - decoding: unused     *)
    frame_skip_cmp: integer;

    (*** border processing masking. raises the quantizer for mbs on the borders
     * of the picture.
     * - encoding: set by user
     * - decoding: unused     *)
    border_masking: single;

    (*** minimum MB lagrange multipler.
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_lmin: integer;

    (*** maximum MB lagrange multipler.
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_lmax: integer;

    (***
     * - encoding: set by user.
     * - decoding: unused     *)
    me_penalty_compensation: integer;

    (***
     * - encoding: unused
     * - decoding: set by user.     *)
    skip_loop_filter: TAVDiscard;

    (**     *
     * - encoding: unused
     * - decoding: set by user.     *)
    skip_idct: TAVDiscard;

    (**     *
     * - encoding: unused
     * - decoding: set by user.     *)
    skip_frame: TAVDiscard;

    (**     *
     * - encoding: set by user.
     * - decoding: unused     *)
    bidir_refine: integer;

    (**     *
     * - encoding: set by user.
     * - decoding: unused     *)
    brd_scale: integer;

    (**
     * constant rate factor - quality-based VBR - values ~correspond to qps
     * - encoding: set by user.
     * - decoding: unused     *)
    crf: integer;

    (**
     * constant quantization parameter rate control method
     * - encoding: set by user.
     * - decoding: unused     *)
    cqp: integer;

    (**
     * minimum gop size
     * - encoding: set by user.
     * - decoding: unused     *)
    keyint_min: integer;

    (**
     * number of reference frames
     * - encoding: set by user.
     * - decoding: unused     *)
    refs: integer;

    (**
     * chroma qp offset from luma
     * - encoding: set by user.
     * - decoding: unused     *)
    chromaoffset: integer;

    (**
     * influences how often b-frames are used
     * - encoding: set by user.
     * - decoding: unused     *)
    bframebias: integer;

    (**
     * trellis RD quantization
     * - encoding: set by user.
     * - decoding: unused     *)
    trellis: integer;

    (**
     * reduce fluctuations in qp (before curve compression)
     * - encoding: set by user.
     * - decoding: unused     *)
    complexityblur: single;

    (**
     * in-loop deblocking filter alphac0 parameter
     * alpha is in the range -6...6
     * - encoding: set by user.
     * - decoding: unused     *)
    deblockalpha: integer;

    (**
     * in-loop deblocking filter beta parameter
     * beta is in the range -6...6
     * - encoding: set by user.
     * - decoding: unused     *)
    deblockbeta: integer;

    (**
     * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
     * - encoding: set by user.
     * - decoding: unused     *)
    partitions: integer;

    (**
     * direct mv prediction mode - 0 (none), 1 (spatial), 2 (temporal)
     * - encoding: set by user.
     * - decoding: unused     *)
    directpred: integer;

    (**
     * audio cutoff bandwidth (0 means "automatic") . Currently used only by FAAC
     * - encoding: set by user.
     * - decoding: unused     *)
    cutoff: integer;

    (**
     * multiplied by qscale for each frame and added to scene_change_score
     * - encoding: set by user.
     * - decoding: unused     *)
    scenechange_factor: integer;

    (**     *
     * note: value depends upon the compare functin used for fullpel ME
     * - encoding: set by user.
     * - decoding: unused     *)
    mv0_threshold: integer;

    (**
     * adjusts sensitivity of b_frame_strategy 1
     * - encoding: set by user.
     * - decoding: unused      *)
    b_sensitivity: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused      *)
    compression_level: integer;

    (**
     * sets whether to use LPC mode - used by FLAC encoder
     * - encoding: set by user.
     * - decoding: unused.     *)
    use_lpc: integer;

    (**
     * LPC coefficient precision - used by FLAC encoder
     * - encoding: set by user.
     * - decoding: unused.     *)
    lpc_coeff_precision: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.           *)
    min_prediction_order: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.            *)
    max_prediction_order: integer;

    (**
     * search method for selecting prediction order
     * - encoding: set by user.
     * - decoding: unused.            *)
    prediction_order_method: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.               *)
    min_partition_order: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.           *)
    max_partition_order: integer;
  end;

(**
 * AVCodec.
 *)
  TAVCodec = record
    name: pchar;
    _type: TCodecType;
    id: TCodecID;
    priv_data_size: integer;
    init: function (avctx: PAVCodecContext): integer; cdecl; (* typo corretion by the Creative CAT *)
    encode: function (avctx: PAVCodecContext; buf: pchar; buf_size: integer; data: pointer): integer; cdecl;
    close: function (avctx: PAVCodecContext): integer; cdecl;
    decode: function (avctx: PAVCodecContext; outdata: pointer; outdata_size: PInteger;
                  buf: pchar; buf_size: integer): integer; cdecl;
    capabilities: integer;
// todo: check this ->
//    void *dummy; // FIXME remove next time we break binary compatibility
    next: PAVCodec;
    flush: procedure (avctx: PAVCodecContext); cdecl;
    supported_framerates: PAVRational; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
    pix_fmts: PAVPixelFormat;       ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
  end;

(**
 * four components are given, that's all.
 * the last component is alpha
 *)
  PAVPicture = ^TAVPicture;
  TAVPicture = record
    data: array [0..3] of pchar;
    linesize: array [0..3] of integer;       ///< number of bytes per line
  end;

(**
 * AVPaletteControl
 * This structure defines a method for communicating palette changes
 * between and demuxer and a decoder.
 * this is totally broken, palette changes should be sent as AVPackets
 *)
  TAVPaletteControl = record
    (* demuxer sets this to 1 to indicate the palette has changed;
     * decoder resets to 0 *)
    palette_changed: integer;

    (* 4-byte ARGB palette entries, stored in native byte order; note that
     * the individual palette components should be on a 8-bit scale; if
     * the palette data comes from a IBM VGA native format, the component
     * data is probably 6 bits in size and needs to be scaled *)
    palette: array [0..AVPALETTE_COUNT - 1] of cardinal;
  end;

  PAVSubtitleRect = ^TAVSubtitleRect;
  TAVSubtitleRect = record
    x: word;
    y: word;
    w: word;
    h: word;
    nb_colors: word;
    linesize: integer;
    rgba_palette: PCardinal;
    bitmap: pchar;
  end;

  PAVSubtitle = ^TAVSubtitle;
  TAVSubtitle = record {20}
    format: word; (* 0 = graphics *)
    start_display_time: cardinal; (* relative to packet pts, in ms *)
    end_display_time: cardinal; (* relative to packet pts, in ms *)
    num_rects: cardinal;
    rects: PAVSubtitleRect;
  end;


(* resample.c *)

  PReSampleContext = pointer;
  PAVResampleContext = pointer;
  PImgReSampleContext = pointer;

function audio_resample_init (output_channels: integer; input_channels: integer;
                              output_rate: integer; input_rate: integer): PReSampleContext;
  cdecl; external av__codec;

function audio_resample (s: PReSampleContext; output: PWord; input: PWord; nb_samples: integer): integer;
  cdecl; external av__codec;

procedure audio_resample_close (s: PReSampleContext);
  cdecl; external av__codec;


function av_resample_init (out_rate: integer; in_rate: integer; filter_length: integer;
                           log2_phase_count: integer; linear: integer; cutoff: double): PAVResampleContext;
  cdecl; external av__codec;

function av_resample (c: PAVResampleContext; dst: PWord; src: PWord; consumed: PInteger;
                      src_size: integer; dst_size: integer; update_ctx: integer): integer;
  cdecl; external av__codec;

procedure av_resample_compensate (c: PAVResampleContext; sample_delta: integer;
                                  compensation_distance: integer);
  cdecl; external av__codec;

procedure av_resample_close (c: PAVResampleContext);
  cdecl; external av__codec;


(* YUV420 format is assumed ! *)

  function img_resample_init (output_width: integer; output_height: integer;
                             input_width: integer; input_height: integer): PImgReSampleContext;
    cdecl; external av__codec;

  function img_resample_full_init (owidth: integer; oheight: integer;
                                      iwidth: integer; iheight: integer;
                                      topBand: integer; bottomBand: integer;
                                      leftBand: integer; rightBand: integer;
                                      padtop: integer; padbottom: integer;
                                      padleft: integer; padright: integer): PImgReSampleContext;
    cdecl; external av__codec;

  procedure img_resample (s: PImgReSampleContext; output: PAVPicture; const input: PAVPicture);
    cdecl; external av__codec;

  procedure img_resample_close (s: PImgReSampleContext);
    cdecl; external av__codec;

(**
 * Allocate memory for a picture.  Call avpicture_free to free it.
 *
 * @param picture the picture to be filled in.
 * @param pix_fmt the format of the picture.
 * @param width the width of the picture.
 * @param height the height of the picture.
 * @return 0 if successful, -1 if not.
 *)
  function avpicture_alloc (picture: PAVPicture; pix_fmt: TAVPixelFormat;
                            width: integer; height: integer): integer;
    cdecl; external av__codec;


(* Free a picture previously allocated by avpicture_alloc. *)
  procedure avpicture_free (picture: PAVPicture);
    cdecl; external av__codec;

  function avpicture_fill (picture: PAVPicture; ptr: pointer;
                   pix_fmt: TAVPixelFormat; width: integer; height: integer): integer;
    cdecl; external av__codec;

  function avpicture_layout (const src: PAVPicture; pix_fmt: TAVPixelFormat;
                     width: integer; height: integer;
                     dest: pchar; dest_size: integer): integer;
    cdecl; external av__codec;

  function avpicture_get_size (pix_fmt: TAVPixelFormat; width: integer; height: integer): integer;
    cdecl; external av__codec;

  procedure avcodec_get_chroma_sub_sample (pix_fmt: TAVPixelFormat; h_shift: Pinteger; v_shift: pinteger);
    cdecl; external av__codec;

  function avcodec_get_pix_fmt_name(pix_fmt: TAVPixelFormat): pchar;
    cdecl; external av__codec;

  procedure avcodec_set_dimensions(s: PAVCodecContext; width: integer; height: integer);
    cdecl; external av__codec;

  function avcodec_get_pix_fmt(const name: pchar): TAVPixelFormat;
    cdecl; external av__codec;

  function avcodec_pix_fmt_to_codec_tag(p: TAVPixelFormat): cardinal;
    cdecl; external av__codec;

  function avcodec_get_pix_fmt_loss (dst_pix_fmt: TAVPixelFormat; src_pix_fmt: TAVPixelFormat;
                             has_alpha: integer): integer;
    cdecl; external av__codec;

  function avcodec_find_best_pix_fmt (pix_fmt_mask: integer; src_pix_fmt: TAVPixelFormat;
                              has_alpha: integer; loss_ptr: pinteger): integer;
    cdecl; external av__codec;

  function img_get_alpha_info (const src: PAVPicture;
		                           pix_fmt: TAVPixelFormat;
                               width: integer; height: integer): integer;
    cdecl; external av__codec;


(* convert among pixel formats *)
  function img_convert (dst: PAVPicture; dst_pix_fmt: TAVPixelFormat;
                const src: PAVPicture; pix_fmt: TAVPixelFormat;
                width: integer; height: integer): integer;
    cdecl; external av__codec;

(* deinterlace a picture *)
  function avpicture_deinterlace (dst: PAVPicture; const src: PAVPicture;
                          pix_fmt: TAVPixelFormat; width: integer; height: integer): integer;
    cdecl; external av__codec;

(* returns LIBAVCODEC_VERSION_INT constant *)
  function avcodec_version (): cardinal;
    cdecl; external av__codec;

(* returns LIBAVCODEC_BUILD constant *)
  function avcodec_build (): cardinal;
    cdecl; external av__codec;

  procedure avcodec_init ();
    cdecl; external av__codec;

  procedure register_avcodec (format: PAVCodec);
    cdecl; external av__codec;

  function avcodec_find_encoder (id: TCodecID): PAVCodec;
    cdecl; external av__codec;
  function avcodec_find_encoder_by_name (name: pchar): PAVCodec;
    cdecl; external av__codec;
  function avcodec_find_decoder(id: TCodecID): PAVCodec;
    cdecl; external av__codec;
  function avcodec_find_decoder_by_name (name: pchar): PAVCodec;
    cdecl; external av__codec;
  procedure avcodec_string(buf: pchar; buf_size: integer; enc: PAVCodecContext; encode: integer);
    cdecl; external av__codec;

  procedure avcodec_get_context_defaults (s: PAVCodecContext);
    cdecl; external av__codec;
  function avcodec_alloc_context : PAVCodecContext;
    cdecl; external av__codec;
(* favourite of The Creative CAT
  function avcodec_alloc_context (): PAVCodecContext;
    cdecl; external av__codec; *)
  procedure avcodec_get_frame_defaults (pic: PAVFrame);
    cdecl; external av__codec;
  function avcodec_alloc_frame : PAVFrame;
    cdecl; external av__codec;
(* favourite of The Creative CAT
  function avcodec_alloc_frame (): PAVFrame;
    cdecl; external av__codec; *)

  function avcodec_default_get_buffer (s: PAVCodecContext; pic: PAVFrame): integer;
    cdecl; external av__codec;
  procedure avcodec_default_release_buffer (s: PAVCodecContext; pic: PAVFrame);
    cdecl; external av__codec;
  function avcodec_default_reget_buffer (s: PAVCodecContext; pic: PAVFrame): integer;
    cdecl; external av__codec;
  procedure avcodec_align_dimensions(s: PAVCodecContext; width: Pinteger; height: PInteger);
    cdecl; external av__codec;
  function avcodec_check_dimensions (av_log_ctx: pointer; w: cardinal; h: cardinal): integer;
    cdecl; external av__codec;
  function avcodec_default_get_format(s: PAVCodecContext; const fmt: PAVPixelFormat): TAVPixelFormat;
    cdecl; external av__codec;

  function avcodec_thread_init (s: PAVCodecContext; thread_count: integer): integer;
    cdecl; external av__codec;
  procedure avcodec_thread_free (s: PAVCodecContext);
    cdecl; external av__codec;
  function avcodec_thread_execute (s: PAVCodecContext; func: pointer; arg: PPointer; ret: Pinteger; count: integer): integer;
    cdecl; external av__codec;
  function avcodec_default_execute (s: PAVCodecContext; func: pointer; arg: PPointer; ret: Pinteger; count: integer): integer;
    cdecl; external av__codec;


//FIXME func typedef

(**
 * opens / inits the AVCodecContext.
 * not thread save!
 *)
  function avcodec_open (avctx: PAVCodecContext; codec: PAVCodec): integer;
    cdecl; external av__codec;


(**
 * Decode an audio frame.
 *
 * @param avctx the codec context.
 * @param samples output buffer, 16 byte aligned
 * @param frame_size_ptr the output buffer size in bytes, zero if no frame could be compressed
 * @param buf input buffer, 16 byte aligned
 * @param buf_size the input buffer size
 * @return 0 if successful, -1 if not.
 *)

(** This comment was added by the Creative CAT.  frame_size_ptr was changed to
 variable refference.
 
 * @deprecated Use avcodec_decode_audio2() instead.
 *)

  function avcodec_decode_audio (avctx: PAVCodecContext; samples: Pword;
                         		 var frame_size_ptr: integer;
                         		 buf: pchar; buf_size: integer): integer;
    cdecl; external av__codec;
(* decode a frame.
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
 * @param buf_size the size of the buffer in bytes
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
 * @return -1 if error, otherwise return the number of
 * bytes used. *)

  function avcodec_decode_audio2(avctx : PAVCodecContext; samples : PWord;
								 var frame_size_ptr : integer;
                         		 buf: pchar; buf_size: integer): integer;
    cdecl; external av__codec;
(* Added by The Creative CAT
/**
 * Decodes a video frame from \p buf into \p picture.
 * The avcodec_decode_video() function decodes a video frame from the input
 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
 * video codec which was coupled with \p avctx using avcodec_open(). The
 * resulting decoded frame is stored in \p picture.
 *
 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
 * the actual read bytes because some optimized bitstream readers read 32 or 64
 * bits at once and could read over the end.
 *
 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
 * no overreading happens for damaged MPEG streams.
 *
 * @note You might have to align the input buffer \p buf and output buffer \p
 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
 * necessary at all, on others it won't work at all if not aligned and on others
 * it will work but it will have an impact on performance. In practice, the
 * bitstream should have 4 byte alignment at minimum and all sample data should
 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
 * the linesize is not a multiple of 16 then there's no sense in aligning the
 * start of the buffer to 16.
 *
 * @param avctx the codec context
 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
 * @param[in] buf the input buffer
 * @param[in] buf_size the size of the input buffer in bytes
 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
 * @return On error a negative value is returned, otherwise the number of bytes
 * used or zero if no frame could be decompressed.
 */
*)

  function avcodec_decode_video (avctx: PAVCodecContext; picture: PAVFrame;
                         var got_picture_ptr: integer; (* favour of The Creative CAT *)
                         buf: PByte; buf_size: integer): integer;
    cdecl; external av__codec;

  function avcodec_decode_subtitle (avctx: PAVCodecContext; sub: PAVSubtitle;
                            got_sub_ptr: pinteger;
                            const buf: pchar; buf_size: integer): integer;
    cdecl; external av__codec;
  function avcodec_parse_frame (avctx: PAVCodecContext; pdata: PPointer;
                        data_size_ptr: pinteger;
                        buf: pchar; buf_size: integer): integer;
    cdecl; external av__codec;

  function avcodec_encode_audio (avctx: PAVCodecContext; buf: PByte;
                        buf_size: integer; const samples: PWord): integer;
    cdecl; external av__codec;

  (* avcodec_encode_video: -1 if error *)
  (* type of the second argument is changed by The Creative CAT *)
  function avcodec_encode_video (avctx: PAVCodecContext; buf: PByte;
                        buf_size: integer; pict: PAVFrame): integer;
    cdecl; external av__codec;
  function avcodec_encode_subtitle (avctx: PAVCodecContext; buf: pchar;
                        buf_size: integer; const sub: PAVSubtitle): integer;
    cdecl; external av__codec;
  function avcodec_close (avctx: PAVCodecContext): integer;
    cdecl; external av__codec;

  procedure avcodec_register_all ();
    cdecl; external av__codec;

  procedure avcodec_flush_buffers (avctx: PAVCodecContext);
    cdecl; external av__codec;
  procedure avcodec_default_free_buffers (s: PAVCodecContext);
    cdecl; external av__codec;

(* misc usefull functions *)

(**
 * returns a single letter to describe the picture type
 *)
  function av_get_pict_type_char (pict_type: integer): char;
    cdecl; external av__codec;


(**
 * returns codec bits per sample
 *)
function av_get_bits_per_sample (codec_id: TCodecID): integer;
  cdecl; external av__codec;

const
  AV_PARSER_PTS_NB      = 4;
  PARSER_FLAG_COMPLETE_FRAMES = $0001;

type
  PAVCodecParserContext = ^TAVCodecParserContext;
  PAVCodecParser = ^TAVCodecParser;

  TAVCodecParserContext = record
    priv_data: pointer;
    parser: PAVCodecParser;
    frame_offset: int64; (* offset of the current frame *)
    cur_offset: int64; (* current offset (incremented by each av_parser_parse()) *)
    last_frame_offset: int64; (* offset of the last frame *)
    (* video info *)
    pict_type: integer; (* XXX: put it back in AVCodecContext *)
    repeat_pict: integer; (* XXX: put it back in AVCodecContext *)
    pts: int64;     (* pts of the current frame *)
    dts: int64;     (* dts of the current frame *)

    (* private data *)
    last_pts: int64;
    last_dts: int64;
    fetch_timestamp: integer;

    cur_frame_start_index: integer;
    cur_frame_offset: array [0..AV_PARSER_PTS_NB - 1] of int64;
    cur_frame_pts: array [0..AV_PARSER_PTS_NB - 1] of int64;
    cur_frame_dts: array [0..AV_PARSER_PTS_NB - 1] of int64;

    flags: integer;
  end;

  TAVCodecParser = record
    codec_ids: array [0..4] of integer; (* several codec IDs are permitted *)
    priv_data_size: integer;
    parser_init: function (s: PAVCodecParserContext): integer; cdecl;
    parser_parse: function (s: PAVCodecParserContext; avctx: PAVCodecContext;
                            poutbuf: PPointer; poutbuf_size: PInteger;
                            const buf: pchar; buf_size: integer): integer; cdecl;
    parser_close: procedure (s: PAVCodecParserContext); cdecl;
    split: function (avctx: PAVCodecContext; const buf: pchar;
                     buf_size: integer): integer; cdecl;
    next: PAVCodecParser;
  end;

  procedure av_register_codec_parser (parser: PAVCodecParser); cdecl;
    cdecl; external av__codec;

  function av_parser_init (codec_id: integer): PAVCodecParserContext;
    cdecl; external av__codec;

  function av_parser_parse (s: PAVCodecParserContext;
                    avctx: PAVCodecContext;
                    poutbuf: PPointer; poutbuf_size: pinteger;
                    const buf: pchar; buf_size: integer;
                    pts: int64; dts: int64): integer;
    cdecl; external av__codec;
  function av_parser_change (s: PAVCodecParserContext;
                     avctx: PAVCodecContext;
                     poutbuf: PPointer; poutbuf_size: PInteger;
                     const buf: pchar; buf_size: integer; keyframe: integer): integer;
    cdecl; external av__codec;
  procedure av_parser_close (s: PAVCodecParserContext);
    cdecl; external av__codec;

type
  PAVBitStreamFilterContext = ^TAVBitStreamFilterContext;
  PAVBitStreamFilter = ^TAVBitStreamFilter;

  TAVBitStreamFilterContext = record
    priv_data: pointer;
    filter: PAVBitStreamFilter;
    parser: PAVCodecParserContext;
    next: PAVBitStreamFilterContext;
  end;

  TAVBitStreamFilter = record
    name: pchar;
    priv_data_size: integer;
    filter: function (bsfc: PAVBitStreamFilterContext;
                  avctx: PAVCodecContext; args: pchar;
                  poutbuf: PPointer; poutbuf_size: PInteger;
                  buf: PByte; buf_size: integer; keyframe: integer): integer; cdecl;
    next: PAVBitStreamFilter;
  end;

procedure av_register_bitstream_filter (bsf: PAVBitStreamFilter);
  cdecl; external av__codec;

function av_bitstream_filter_init (name: pchar): PAVBitStreamFilterContext;
  cdecl; external av__codec;

function av_bitstream_filter_filter (bsfc: PAVBitStreamFilterContext;
                               avctx: PAVCodecContext; args: pchar;
                               poutbuf: PPointer; poutbuf_size: PInteger;
                               buf: PByte; buf_size: integer; keyframe: integer): integer;
  cdecl; external av__codec;
procedure av_bitstream_filter_close (bsf: PAVBitStreamFilterContext);
  cdecl; external av__codec;


(* memory *)
  procedure av_fast_realloc (ptr: pointer; size: PCardinal; min_size: Cardinal);
    cdecl; external av__codec;
(* for static data only *)
(* call av_free_static to release all staticaly allocated tables *)
  procedure  av_free_static ();
    cdecl; external av__codec;

  procedure av_mallocz_static(size: cardinal);
    cdecl; external av__codec;

  procedure av_realloc_static(ptr: pointer; size: Cardinal);
    cdecl; external av__codec;

  procedure img_copy (dst: PAVPicture; const src: PAVPicture;
                      pix_fmt: TAVPixelFormat; width: integer; height: integer);
    cdecl; external av__codec;

  function img_crop (dst: PAVPicture; const src: PAVPicture;
             pix_fmt: TAVPixelFormat; top_band, left_band: integer): integer;
    cdecl; external av__codec;

  function img_pad (dst: PAVPicture; const src: PAVPicture; height, width: integer;
                    pix_fmt: TAVPixelFormat; padtop, padbottom, padleft, padright: integer;
                    color: PInteger): integer;
    cdecl; external av__codec;

implementation

end.