aboutsummaryrefslogtreecommitdiffstats
path: root/src/lib/ffmpeg/avcodec.pas
blob: b6984328160b2a991ec244b953496eaf9a400258 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
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
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
(*
 * 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.
 * - Changes and updates by the UltraStar Deluxe Team
 *)

(*
 * Conversion of libavcodec/avcodec.h
 * Min. version: 51.16.0, revision 6577, Sat Oct 7 15:30:46 2006 UTC 
 * Max. version: 52.11.0, revision 16912, Sun Feb 1 02:00:19 2009 UTC 
 *)
{
 * update to
 * Max. version: 52.30.2, Fri Jun 12 21:05:00 2009 UTC 
 * MiSchi
}

unit avcodec;

{$IFDEF FPC}
  {$MODE DELPHI }
  {$PACKENUM 4}    (* use 4-byte enums *)
  {$PACKRECORDS C} (* C/C++-compatible record packing *)
{$ELSE}
  {$MINENUMSIZE 4} (* use 4-byte enums *)
{$ENDIF}

{$IFDEF DARWIN}
  {$linklib libavcodec}
{$ENDIF}

interface

uses
  ctypes,
  avutil,
  rational,
  opt,
  SysUtils,
  {$IFDEF UNIX}
  BaseUnix,
  {$ENDIF}
  UConfig;

const
  (* Max. supported version by this header *)
  LIBAVCODEC_MAX_VERSION_MAJOR   = 52;
  LIBAVCODEC_MAX_VERSION_MINOR   = 30;
  LIBAVCODEC_MAX_VERSION_RELEASE = 2;
  LIBAVCODEC_MAX_VERSION = (LIBAVCODEC_MAX_VERSION_MAJOR * VERSION_MAJOR) +
                           (LIBAVCODEC_MAX_VERSION_MINOR * VERSION_MINOR) +
                           (LIBAVCODEC_MAX_VERSION_RELEASE * VERSION_RELEASE);

  (* Min. supported version by this header *)
  LIBAVCODEC_MIN_VERSION_MAJOR   = 51;
  LIBAVCODEC_MIN_VERSION_MINOR   = 16;
  LIBAVCODEC_MIN_VERSION_RELEASE = 0;
  LIBAVCODEC_MIN_VERSION = (LIBAVCODEC_MIN_VERSION_MAJOR * VERSION_MAJOR) +
                            (LIBAVCODEC_MIN_VERSION_MINOR * VERSION_MINOR) +
                            (LIBAVCODEC_MIN_VERSION_RELEASE * VERSION_RELEASE);

(* Check if linked versions are supported *)
{$IF (LIBAVCODEC_VERSION < LIBAVCODEC_MIN_VERSION)}
  {$MESSAGE Error 'Linked version of libavcodec is too old!'}
{$IFEND}

(* Check if linked version is supported *)
{$IF (LIBAVCODEC_VERSION > LIBAVCODEC_MAX_VERSION)}
  {$MESSAGE Error 'Linked version of libavcodec is not yet supported!'}
{$IFEND}

const
  AV_NOPTS_VALUE: cint64  = $8000000000000000;
  AV_TIME_BASE            = 1000000;
  AV_TIME_BASE_Q: TAVRational = (num: 1; den: AV_TIME_BASE);

(**
 * Identifies the syntax and semantics of the bitstream.
 * The principle is roughly:
 * Two decoders with the same ID can decode the same streams.
 * Two encoders with the same ID can encode compatible streams.
 * There may be slight deviations from the principle due to implementation
 * details.
 *
 * If you add a codec ID to this list, add it so that
 * 1. no value of a existing codec ID changes (that would break ABI),
 * 2. it is as close as possible to similar codecs.
 *)
type
  TCodecID = (
    CODEC_ID_NONE,
    
    (* video codecs *)
    CODEC_ID_MPEG1VIDEO,
    CODEC_ID_MPEG2VIDEO, //* prefered ID for MPEG Video 1/2 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,
    CODEC_ID_TARGA,
    CODEC_ID_DSICINVIDEO,
    CODEC_ID_TIERTEXSEQVIDEO,
    CODEC_ID_TIFF,
    CODEC_ID_GIF,
    CODEC_ID_FFH264,
    CODEC_ID_DXA,
    CODEC_ID_DNXHD,
    CODEC_ID_THP,
    CODEC_ID_SGI,
    CODEC_ID_C93,
    CODEC_ID_BETHSOFTVID,
    CODEC_ID_PTX,
    CODEC_ID_TXD,
    CODEC_ID_VP6A,
    CODEC_ID_AMV,
    CODEC_ID_VB,
    CODEC_ID_PCX,
    CODEC_ID_SUNRAST,
    CODEC_ID_INDEO4,
    CODEC_ID_INDEO5,
    CODEC_ID_MIMIC,
    CODEC_ID_RL2,
    CODEC_ID_8SVX_EXP,
    CODEC_ID_8SVX_FIB,
    CODEC_ID_ESCAPE124,
    CODEC_ID_DIRAC,
    CODEC_ID_BFI,
    CODEC_ID_CMV,
    CODEC_ID_MOTIONPIXELS,
    CODEC_ID_TGV,
    CODEC_ID_TGQ,
{$IF LIBAVCODEC_VERSION >= 52012000}  // 52.12.0
    CODEC_ID_TQI,
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52022002}  // 52.22.2
    CODEC_ID_AURA,
    CODEC_ID_AURA2,
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52027000}  // 52.27.0
    CODEC_ID_V210X,
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52028000}  // 52.28.0
    CODEC_ID_TMV,
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52029000}  // 52.29.0
    CODEC_ID_V210,
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52030002}  // 52.30.2
    CODEC_ID_DPX,
{$IFEND}

    //* 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,
    CODEC_ID_PCM_ZORK,
    CODEC_ID_PCM_S16LE_PLANAR,
    CODEC_ID_PCM_DVD,
    CODEC_ID_PCM_F32BE,
    CODEC_ID_PCM_F32LE,
    CODEC_ID_PCM_F64BE,
    CODEC_ID_PCM_F64LE,

    //* 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,
    CODEC_ID_ADPCM_THP,
    CODEC_ID_ADPCM_IMA_AMV,
    CODEC_ID_ADPCM_EA_R1,
    CODEC_ID_ADPCM_EA_R3,
    CODEC_ID_ADPCM_EA_R2,
    CODEC_ID_ADPCM_IMA_EA_SEAD,
    CODEC_ID_ADPCM_IMA_EA_EACS,
    CODEC_ID_ADPCM_EA_XAS,
    CODEC_ID_ADPCM_EA_MAXIS_XA,
    CODEC_ID_ADPCM_IMA_ISS,

    //* 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,

    (* audio codecs *)
    CODEC_ID_MP2= $15000,
    CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
    CODEC_ID_AAC,
    {$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
    _CODEC_ID_MPEG4AAC, // will be redefined to CODEC_ID_AAC below
    {$IFEND}
    CODEC_ID_AC3,
    CODEC_ID_DTS,
    CODEC_ID_VORBIS,
    CODEC_ID_DVAUDIO,
    CODEC_ID_WMAV1,
    CODEC_ID_WMAV2,
    CODEC_ID_MACE3,
    CODEC_ID_MACE6,
    CODEC_ID_VMDAUDIO,
    CODEC_ID_SONIC,
    CODEC_ID_SONIC_LS,
    CODEC_ID_FLAC,
    CODEC_ID_MP3ADU,
    CODEC_ID_MP3ON4,
    CODEC_ID_SHORTEN,
    CODEC_ID_ALAC,
    CODEC_ID_WESTWOOD_SND1,
    CODEC_ID_GSM, ///< as in Berlin toast format
    CODEC_ID_QDM2,
    CODEC_ID_COOK,
    CODEC_ID_TRUESPEECH,
    CODEC_ID_TTA,
    CODEC_ID_SMACKAUDIO,
    CODEC_ID_QCELP,
    CODEC_ID_WAVPACK,
    CODEC_ID_DSICINAUDIO,
    CODEC_ID_IMC,
    CODEC_ID_MUSEPACK7,
    CODEC_ID_MLP,
    CODEC_ID_GSM_MS, { as found in WAV }
    CODEC_ID_ATRAC3,
    CODEC_ID_VOXWARE,
    CODEC_ID_APE,
    CODEC_ID_NELLYMOSER,
    CODEC_ID_MUSEPACK8,
    CODEC_ID_SPEEX,
    CODEC_ID_WMAVOICE,
    CODEC_ID_WMAPRO,
    CODEC_ID_WMALOSSLESS,
    CODEC_ID_ATRAC3P,
    CODEC_ID_EAC3,
    CODEC_ID_SIPR,
    CODEC_ID_MP1,
{$IF LIBAVCODEC_VERSION >= 52020000} // 52.20.0
    CODEC_ID_TWINVQ,
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52022000} // 52.22.0
    CODEC_ID_TRUEHD,
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52026000} // 52.26.0
    CODEC_ID_MP4ALS,
{$IFEND}

    //* subtitle codecs */
    CODEC_ID_DVD_SUBTITLE= $17000,
    CODEC_ID_DVB_SUBTITLE,
    CODEC_ID_TEXT,  ///< raw UTF-8 text
    CODEC_ID_XSUB,
    CODEC_ID_SSA,
    CODEC_ID_MOV_TEXT,

    (* other specific kind of codecs (generally used for attachments) *)
    CODEC_ID_TTF= $18000,

    CODEC_ID_PROBE= $19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it

    CODEC_ID_MPEG2TS= $20000, {*< _FAKE_ codec to indicate a raw MPEG-2 TS
                               * stream (only used by libavformat) *}
    __CODEC_ID_4BYTE = $FFFFF  // ensure 4-byte enum
  );

{$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
{* CODEC_ID_MP3LAME is obsolete *}
const
  CODEC_ID_MP3LAME = CODEC_ID_MP3;
  CODEC_ID_MPEG4AAC = CODEC_ID_AAC;
{$IFEND}

type
  TCodecType = (
    CODEC_TYPE_UNKNOWN = -1,
    CODEC_TYPE_VIDEO,
    CODEC_TYPE_AUDIO,
    CODEC_TYPE_DATA,
    CODEC_TYPE_SUBTITLE,
    CODEC_TYPE_ATTACHMENT,
    CODEC_TYPE_NB
  );

{**
 * all in native endian
 *}
type
  TSampleFormat = (
    SAMPLE_FMT_NONE = -1,
    SAMPLE_FMT_U8,              ///< unsigned 8 bits
    SAMPLE_FMT_S16,             ///< signed 16 bits
    SAMPLE_FMT_S32,             ///< signed 32 bits
    SAMPLE_FMT_FLT,             ///< float
    SAMPLE_FMT_DBL,             ///< double
    SAMPLE_FMT_NB               ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
  );
  _TSampleFormatArray = array [0 .. MaxInt div SizeOf(TSampleFormat)-1] of TSampleFormat;
  PSampleFormatArray = ^_TSampleFormatArray;

const
  {* Audio channel masks *}
  CH_FRONT_LEFT             = $00000001;
  CH_FRONT_RIGHT            = $00000002;
  CH_FRONT_CENTER           = $00000004;
  CH_LOW_FREQUENCY          = $00000008;
  CH_BACK_LEFT              = $00000010;
  CH_BACK_RIGHT             = $00000020;
  CH_FRONT_LEFT_OF_CENTER   = $00000040;
  CH_FRONT_RIGHT_OF_CENTER  = $00000080;
  CH_BACK_CENTER            = $00000100;
  CH_SIDE_LEFT              = $00000200;
  CH_SIDE_RIGHT             = $00000400;
  CH_TOP_CENTER             = $00000800;
  CH_TOP_FRONT_LEFT         = $00001000;
  CH_TOP_FRONT_CENTER       = $00002000;
  CH_TOP_FRONT_RIGHT        = $00004000;
  CH_TOP_BACK_LEFT          = $00008000;
  CH_TOP_BACK_CENTER        = $00010000;
  CH_TOP_BACK_RIGHT         = $00020000;
  CH_STEREO_LEFT            = $20000000;  ///< Stereo downmix.
  CH_STEREO_RIGHT           = $40000000;  ///< See CH_STEREO_LEFT.

  {* Audio channel convenience macros *}
  CH_LAYOUT_MONO            = (CH_FRONT_CENTER);
  CH_LAYOUT_STEREO          = (CH_FRONT_LEFT or CH_FRONT_RIGHT);
  CH_LAYOUT_SURROUND        = (CH_LAYOUT_STEREO or CH_FRONT_CENTER);
{$IF LIBAVCODEC_VERSION >= 52027000} // 52.27.0
  CH_LAYOUT_2_1               (CH_LAYOUT_STEREO or CH_BACK_CENTER);
  CH_LAYOUT_4POINT0           (CH_LAYOUT_SURROUND or CH_BACK_CENTER);
  CH_LAYOUT_2_2               (CH_LAYOUT_STEREO or CH_SIDE_LEFT or CH_SIDE_RIGHT);
{$IFEND}
  CH_LAYOUT_QUAD            = (CH_LAYOUT_STEREO or CH_BACK_LEFT or CH_BACK_RIGHT);
  CH_LAYOUT_5POINT0         = (CH_LAYOUT_SURROUND or CH_SIDE_LEFT or CH_SIDE_RIGHT);
  CH_LAYOUT_5POINT1         = (CH_LAYOUT_5POINT0 or CH_LOW_FREQUENCY);
{$IF LIBAVCODEC_VERSION >= 52025000} // 52.25.0
  CH_LAYOUT_5POINT0_BACK    = (CH_LAYOUT_SURROUND or CH_BACK_LEFT or 
                               CH_BACK_RIGHT);
  CH_LAYOUT_5POINT1_BACK    = (CH_LAYOUT_5POINT0_BACK or CH_LOW_FREQUENCY);
{$IFEND}
  CH_LAYOUT_7POINT1         = (CH_LAYOUT_5POINT1 or CH_BACK_LEFT or CH_BACK_RIGHT);
{$IF LIBAVCODEC_VERSION < 52025000} // 52.25.0
  CH_LAYOUT_7POINT1_WIDE    = (CH_LAYOUT_SURROUND or CH_LOW_FREQUENCY or
                               CH_BACK_LEFT or CH_BACK_RIGHT or
{$ELSE}
  CH_LAYOUT_7POINT1_WIDE    = (CH_LAYOUT_5POINT1_BACK or 
{$IFEND}
                               CH_FRONT_LEFT_OF_CENTER or
                               CH_FRONT_RIGHT_OF_CENTER);
  CH_LAYOUT_STEREO_DOWNMIX  = (CH_STEREO_LEFT or CH_STEREO_RIGHT);


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.
 *}
  TMotion_Est_ID = (
    ME_ZERO = 1,  ///< no search, that is use 0,0 vector whenever one is needed
    ME_FULL,
    ME_LOG,
    ME_PHODS,
    ME_EPZS,      ///< enhanced predictive zonal search
    ME_X1,        ///< reserved for experiments
    ME_HEX,       ///< hexagon based search
    ME_UMH,       ///< uneven multi-hexagon search
    ME_ITER,      ///< iterative search
    ME_TESA       ///< transformed exhaustive search algorithm
  );

  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
  );

{$IF LIBAVCODEC_VERSION < 52028000} // < 52.28.0
  TAVColorPrimaries = (
    AVCOL_PRI_BT709       = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
    AVCOL_PRI_UNSPECIFIED = 2,
    AVCOL_PRI_BT470M      = 4,
    AVCOL_PRI_BT470BG     = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
    AVCOL_PRI_SMPTE170M   = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
    AVCOL_PRI_SMPTE240M   = 7, ///< functionally identical to above
    AVCOL_PRI_FILM        = 8,
    AVCOL_PRI_NB               ///< Not part of ABI
  );

  TAVColorTransferCharacteristic = (
    AVCOL_TRC_BT709       = 1, ///< also ITU-R BT1361
    AVCOL_TRC_UNSPECIFIED = 2,
    AVCOL_TRC_GAMMA22     = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
    AVCOL_TRC_GAMMA28     = 5, ///< also ITU-R BT470BG
    AVCOL_TRC_NB               ///< Not part of ABI
  );

  TAVColorSpace = (
    AVCOL_SPC_RGB         = 0,
    AVCOL_SPC_BT709       = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
    AVCOL_SPC_UNSPECIFIED = 2,
    AVCOL_SPC_FCC         = 4,
    AVCOL_SPC_BT470BG     = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
    AVCOL_SPC_SMPTE170M   = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
    AVCOL_SPC_SMPTE240M   = 7,
    AVCOL_SPC_NB               ///< Not part of ABI
  );

  TAVColorRange = (
    AVCOL_RANGE_UNSPECIFIED = 0,
    AVCOL_RANGE_MPEG        = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
    AVCOL_RANGE_JPEG        = 2, ///< the normal     2^n-1   "JPEG" YUV ranges
    AVCOL_RANGE_NB               ///< Not part of ABI
  );

(**
 *  X   X      3 4 X      X are luma samples,
 *             1 2        1-6 are possible chroma positions
 *  X   X      5 6 X      0 is undefined/unknown position
 *)
  TAVChromaLocation = (
    AVCHROMA_LOC_UNSPECIFIED = 0,
    AVCHROMA_LOC_LEFT        = 1, ///< mpeg2/4, h264 default
    AVCHROMA_LOC_CENTER      = 2, ///< mpeg1, jpeg, h263
    AVCHROMA_LOC_TOPLEFT     = 3, ///< DV
    AVCHROMA_LOC_TOP         = 4,
    AVCHROMA_LOC_BOTTOMLEFT  = 5,
    AVCHROMA_LOC_BOTTOM      = 6,
    AVCHROMA_LOC_NB               ///< Not part of ABI
  );
{$IFEND}

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

const
  FF_MAX_B_FRAMES = 16;

{* encoding support
   These flags can be passed in AVCodecContext.flags before initialization.
   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.
  {**
   * The parent program guarantees that the input for B-frames containing
   * streams is not written to for at least s->max_b_frames+1 frames, if
   * this is not set 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       = $00100000; ///< use alternate scan
  {$IF LIBAVCODEC_VERSION < 52000000} // < 52.0.0
  CODEC_FLAG_TRELLIS_QUANT  = $00200000; ///< use trellis quantization
  {$IFEND}
  CODEC_FLAG_GLOBAL_HEADER  = $00400000; ///< place global headers in extradata instead of every keyframe
  CODEC_FLAG_BITEXACT       = $00800000; ///< use only bitexact stuff (except (i)dct)
  {* Fx : Flag for h263+ extra options *}
  {$IF LIBAVCODEC_VERSION < 52000000} // < 52.0.0
  CODEC_FLAG_H263P_AIC      = $01000000; ///< H263 Advanced intra coding / MPEG4 AC prediction (remove this)
  {$IFEND}
  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)
  CODEC_FLAG2_DROP_FRAME_TIMECODE = $00002000; ///< timecode is in drop frame format.
  CODEC_FLAG2_SKIP_RD       = $00004000; ///< RD optimal MB level residual skipping
  CODEC_FLAG2_CHUNKS        = $00008000; ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
  CODEC_FLAG2_NON_LINEAR_QUANT = $00010000; ///< Use MPEG-2 nonlinear quantizer.
  CODEC_FLAG2_BIT_RESERVOIR = $00020000; ///< Use a bit reservoir when encoding if possible

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

const
  CODEC_CAP_DRAW_HORIZ_BAND = $0001; ///< decoder can use draw_horiz_band callback
  (**
   * Codec uses get_buffer() for allocating buffers.
   * direct rendering method 1
   *)
  CODEC_CAP_DR1             = $0002;
  (* if 'parse_only' field is true, then avcodec_parse_frame() can be used *)
  CODEC_CAP_PARSE_ONLY      = $0004;
  CODEC_CAP_TRUNCATED       = $0008;
  (* codec can export data for HW decoding (XvMC) *)
  CODEC_CAP_HWACCEL         = $0010;
  (**
   * 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;

  (**
   * Codec can export data for HW decoding (VDPAU).
   *)
  CODEC_CAP_HWACCEL_VDPAU    = $0080;

   //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 libavcodec. *)
    id: cint;

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

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

const
  FF_QSCALE_TYPE_MPEG1  = 0;
  FF_QSCALE_TYPE_MPEG2  = 1;
  FF_QSCALE_TYPE_H264   = 2;

  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; ///< Switching Intra
  FF_SP_TYPE = 6; ///< Switching Predicted
  FF_BI_TYPE = 7;

  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)

const
  {$IF LIBAVCODEC_VERSION < 52000000} // < 52.0.0
  DEFAULT_FRAME_RATE_BASE = 1001000;
  {$IFEND}

  FF_ASPECT_EXTENDED = 15;

  FF_RC_STRATEGY_XVID = 1;

  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_BUG_FAKE_SCALABILITY = 16 //Autodetection should work 100%.

  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_IDCT_CAVS         = 15;
  FF_IDCT_SIMPLEARMV5TE= 16;
  FF_IDCT_SIMPLEARMV6  = 17;
  FF_IDCT_SIMPLEVIS    = 18;
  FF_IDCT_WMV2         = 19;
  FF_IDCT_FAAN         = 20;
  FF_IDCT_EA           = 21;
  FF_IDCT_SIMPLENEON   = 22;
  FF_IDCT_SIMPLEALPHA  = 23;

  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       = $0004; ///< AMD 3DNOW
  {$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
  FF_MM_MMXEXT      = $0002; ///< SSE integer functions or AMD MMX ext
  {$IFEND}
  {$IF LIBAVCODEC_VERSION >= 52024000} // >= 52.24.0
  FF_MM_MMX2        = $0002; ///< SSE integer functions or AMD MMX ext
  {$IFEND}
  FF_MM_SSE         = $0008; ///< SSE functions
  FF_MM_SSE2        = $0010; ///< PIV SSE2 functions
  FF_MM_3DNOWEXT    = $0020; ///< AMD 3DNowExt
  FF_MM_SSE3        = $0040; ///< Prescott SSE3 functions
  FF_MM_SSSE3       = $0080; ///< Conroe SSSE3 functions
  {$IF LIBAVCODEC_VERSION >= 52022003} // >= 52.22.3
  FF_MM_SSE4        = $0100; ///< Penryn SSE4.1 functions
  FF_MM_SSE42       = $0200; ///< Nehalem SSE4.2 functions
  {$IFEND}
  FF_MM_IWMMXT      = $0100; ///< XScale IWMMXT
  FF_MM_ALTIVEC     = $0001; ///< standard AltiVec

  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_BUFFERS      = $00008000;

  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_DCT264 = 14;
  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;
  FF_CODER_TYPE_RAW     = 2;
  FF_CODER_TYPE_RLE     = 3;
  FF_CODER_TYPE_DEFLATE = 4;

  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 distortion

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

  FF_PROFILE_UNKNOWN  = -99;
  FF_PROFILE_AAC_MAIN = 0;
  FF_PROFILE_AAC_LOW  = 1;
  FF_PROFILE_AAC_SSR  = 2;
  FF_PROFILE_AAC_LTP  = 3;

  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 *)

  FF_COMPRESSION_DEFAULT = -1;

const
  AVPALETTE_SIZE = 1024;
  AVPALETTE_COUNT = 256;

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
type
(**
 * AVPaletteControl
 * This structure defines a method for communicating palette changes
 * between and demuxer and a decoder.
 *
 * @deprecated Use AVPacket to send palette changes instead.
 * This is totally broken.
 *)
  PAVPaletteControl = ^TAVPaletteControl;
  TAVPaletteControl = record
    (* demuxer sets this to 1 to indicate the palette has changed;
     * decoder resets to 0 *)
    palette_changed: cint;

    (* 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 cuint;
  end; {deprecated;}
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 52023000} // >= 52.23.0
type
  PAVPacket = ^TAVPacket;
  TAVPacket = record
(*
 * Presentation timestamp in AVStream->time_base units; the time at which
 * the decompressed packet will be presented to the user.
 * Can be AV_NOPTS_VALUE if it is not stored in the file.
 * pts MUST be larger or equal to dts as presentation cannot happen before
 * decompression, unless one wants to view hex dumps. Some formats misuse
 * the terms dts and pts/cts to mean something different. Such timestamps
 * must be converted to true pts/dts before they are stored in AVPacket.
 *)
    pts:          cint64;
(*
 * Decompression timestamp in AVStream->time_base units; the time at which
 * the packet is decompressed.
 * Can be AV_NOPTS_VALUE if it is not stored in the file.
 *)
    dts:          cint64;
    data:         PByteArray;
    size:         cint;
    stream_index: cint;
    flags:        cint;
(*
 * Duration of this packet in AVStream->time_base units, 0 if unknown.
 * Equals next_pts - this_pts in presentation order.
 *)
    duration:     cint;
    destruct:     procedure (para1: PAVPacket); cdecl;
    priv:         pointer;
    pos:          cint64;       // byte position in stream, -1 if unknown

(*
 * Time difference in AVStream->time_base units from the pts of this
 * packet to the point at which the output from the decoder has converged
 * independent from the availability of previous frames. That is, the
 * frames are virtually identical no matter if decoding started from
 * the very first frame or from this keyframe.
 * Is AV_NOPTS_VALUE if unknown.
 * This field is not the display duration of the current packet.
 *
 * The purpose of this field is to allow seeking in streams that have no
 * keyframes in the conventional sense. It corresponds to the
 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
 * essential for some types of subtitle streams to ensure that all
 * subtitles are correctly displayed after seeking.
 *)
    convergence_duration: cint64;
  end;

const
  {$IF LIBAVCODEC_VERSION < 52030002} // >= 52.30.2
  PKT_FLAG_KEY = $0001;
  {$ELSE}
  AV_PKT_FLAG_KEY = $0001;
    {$IF LIBAVCODEC_VERSION_MAJOR < 53}
  PKT_FLAG_KEY = AV_PKT_FLAG_KEY;
    {$IFEND}
  {$IFEND}
{$IFEND}

type
  PAVClass = ^TAVClass; {const}
  PAVCodecContext = ^TAVCodecContext;

  PAVCodec = ^TAVCodec;

{$IF LIBAVCODEC_VERSION >= 52018000} // 52.18.0
  PAVHWAccel = ^TAVHWAccel;
{$IFEND}

  // int[4]
  PQuadIntArray = ^TQuadIntArray;
  TQuadIntArray = array[0..3] of cint;
  // int (*func)(struct AVCodecContext *c2, void *arg)
  TExecuteFunc = function(c2: PAVCodecContext; arg: Pointer): cint; cdecl;

  TAVClass = record
    class_name: PAnsiChar;
    (* 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(): PAnsiChar; cdecl;
    option: PAVOption;
  end;

  {**
   * Audio Video Frame.
   * New fields can be added to the end of FF_COMMON_FRAME with minor version
   * bumps.
   * Removal, reordering and changes to existing fields require a major
   * version bump. No fields should be added into AVFrame before or after
   * FF_COMMON_FRAME!
   * sizeof(AVFrame) must not be used outside libav*.
   *}
  PAVFrame = ^TAVFrame;
  TAVFrame = record {200}
    (**
     * pointer to the picture planes.
     * This might be different from the first allocated byte
     * - encoding:
     * - decoding:
     *)
    data: array [0..3] of pbyte;
    linesize: array [0..3] of cint;
    (**
     * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
     * This isn't used by libavcodec unless the default get/release_buffer() is used.
     * - encoding:
     * - decoding:
     *)
    base: array [0..3] of pbyte;
    (**
     * 1 -> keyframe, 0-> not
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
    key_frame: cint;
    (**
     * Picture type of the frame, see ?_TYPE below.
     * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
     * - decoding: Set by libavcodec.
     *)
    pict_type: cint;
    (**
     * 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.
     * - encoding: MUST be set by user.
     * - decoding: Set by libavcodec.
     *)
    pts: cint64;
    (**
     * picture number in bitstream order
     * - encoding: set by
     * - decoding: Set by libavcodec.
     *)
    coded_picture_number: cint;
    (**
     * picture number in display order
     * - encoding: set by
     * - decoding: Set by libavcodec.
     *)
    display_picture_number: cint;
    (**
     * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
     * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
     * - decoding: Set by libavcodec.
     *)
    quality: cint;
    (**
     * buffer age (1->was last buffer and dint change, 2->..., ...).
     * Set to INT_MAX if the buffer has not been used yet.
     * - encoding: unused
     * - decoding: MUST be set by get_buffer().
     *)
    age: cint;
    (**
     * is this picture used as reference
     * The values for this are the same as the MpegEncContext.picture_structure
     * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
     * Set to 4 for delayed, non-reference frames.
     * - encoding: unused
     * - decoding: Set by libavcodec. (before get_buffer() call)).
     *)
    reference: cint;
    (**
     * QP table
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    qscale_table: PShortint;
    (**
     * QP store stride
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    qstride: cint;
    (**
     * mbskip_table[mb]>=1 if MB didn't change
     * stride= mb_width = (width+15)>>4
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    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 libavcodec.
     *)
    //int16_t (*motion_val[2])[2];
    motion_val: array [0..1] of pointer;
    (**
     * macroblock type table
     * mb_type_base + mb_width + 2
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    mb_type: PCuint;
    (**
     * log2 of the size of the block which a single vector in motion_val represents:
     * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    motion_subsample_log2: byte;
    (**
     * for some private data of the user
     * - encoding: unused
     * - decoding: Set by user.
     *)
    opaque: pointer;
    (**
     * error
     * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
     * - decoding: unused
     *)
    error: array [0..3] of cuint64;
    (**
     * type of the buffer (to keep track of who has to deallocate data[*])
     * - encoding: Set by the one who allocates it.
     * - decoding: Set by the one who allocates it.
     * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
     *)
    type_: cint;
    (**
     * When decoding, this signals how much the picture must be delayed.
     * extra_delay = repeat_pict / (2*fps)
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    repeat_pict: cint;
    (**
     *
     *)
    qscale_type: cint;
    (**
     * The content of the picture is interlaced.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec. (default 0)
     *)
    interlaced_frame: cint;
    (**
     * If the content is interlaced, is top field displayed first.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    top_field_first: cint;
    (**
     * Pan scan.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    pan_scan: PAVPanScan;
    (**
     * Tell user application that palette has changed from previous frame.
     * - encoding: ??? (no palette-enabled encoder yet)
     * - decoding: Set by libavcodec. (default 0).
     *)
    palette_has_changed: cint;
    (**
     * codec suggestion on buffer type if != 0
     * - encoding: unused
     * - decoding: Set by libavcodec. (before get_buffer() call)).
     *)
    buffer_hints: cint;
    (**
     * DCT coefficients
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    dct_coeff: PsmallInt;
    (**
     * motion referece frame index
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    ref_index: array [0..1] of PShortint;

    {$IF LIBAVCODEC_VERSION >= 51068000} // 51.68.0
    (**
     * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque
     * output in AVFrame.reordered_opaque
     * - encoding: unused
     * - decoding: Read by user.
     *)
    reordered_opaque: cint64;
    {$IFEND}
    
    {$IF LIBAVCODEC_VERSION = 52021000} // 52.21.0
    (**
     * hardware accelerator private data (FFmpeg allocated)
     * - encoding: unused
     * - decoding: Set by libavcodec
     *)
    hwaccel_data_private: pointer;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52022000} // 52.22.0
    hwaccel_picture_private: pointer;
    {$IFEND}

    {$IF LIBAVCODEC_VERSION >= 51070000} // 51.70.0
    (**
     * Bits per sample/pixel of internal libavcodec pixel/sample format.
     * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
     * - encoding: set by user.
     * - decoding: set by libavcodec.
     *)
    bits_per_raw_sample: cint;
    {$IFEND}

    {$IF LIBAVCODEC_VERSION >= 52002000} // 52.2.0
    (**
     * Audio channel layout.
     * - encoding: set by user.
     * - decoding: set by libavcodec.
     *)
    channel_layout: cint64;

    (**
     * Request decoder to use this channel layout if it can (0 for default)
     * - encoding: unused
     * - decoding: Set by user.
     *)
    request_channel_layout: cint64;
    {$IFEND}

    {$IF LIBAVCODEC_VERSION >= 52004000} // 52.4.0
    (**
     * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
     * - encoding: Set by user.
     * - decoding: unused.
     *)
    rc_max_available_vbv_use: cfloat;

    (**
     * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
     * - encoding: Set by user.
     * - decoding: unused.
     *)
    rc_min_vbv_overflow_use: cfloat;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52018000} // < 52.18.0
    (**
     * Hardware accelerator in use
     * - encoding: unused.
     * - decoding: Set by libavcodec
     *)
    hwaccel: PAVHWAccel;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52020000} // < 52.20.0
    (**
     * For some codecs, the time base is closer to the field rate than the frame rate.
     * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
     * if no telecine is used ...
     *
     * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
     *)
    ticks_per_frame: cint;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52021000} // < 52.21.0
    (**
     * Hardware accelerator context.
     * For some hardware accelerators, a global context needs to be
     * provided by the user. In that case, this holds display-dependent
     * data FFmpeg cannot instantiate itself. Please refer to the
     * FFmpeg HW accelerator documentation to know how to fill this
     * is. e.g. for VA API, this is a struct vaapi_context.
     * - encoding: unused
     * - decoding: Set by user
     *)
    hwaccel_context: pointer;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION < 52028000} // < 52.28.0
    (**
     * Chromaticity coordinates of the source primaries.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    color_primaries: TAVColorPrimaries;

    (**
     * Color Transfer Characteristic.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    color_trc: TAVColorTransferCharacteristic;

    (**
     * YUV colorspace type.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    colorspace: TAVColorSpace;

    (**
     * MPEG vs JPEG YUV range.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    color_range: TAVColorRange;

    (**
     * This defines the location of chroma samples.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
     chroma_sample_location: TAVChromaLocation;
    {$IFEND}
  end;

  (**
   * main external API structure.
   * New fields can be added to the end with minor version bumps.
   * Removal, reordering and changes to existing fields require a major
   * version bump.
   * sizeof(AVCodecContext) must not be used outside libav*.
   *)
  TAVCodecContext = record {720}
    (**
     * information 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 libavcodec. 0 or some bitrate if this info is available in the stream.
     *)
    bit_rate: cint;

    (**
     * 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: cint;

    (**
     * CODEC_FLAG_*.
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    flags: cint;

    (**
     * Some codecs need additional format info. It is stored here.
     * If any muxer uses this then ALL demuxers/parsers AND encoders for the
     * specific codec MUST set it correctly otherwise stream copy breaks.
     * In general use of this field by muxers is not recommanded.
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec. (FIXME: Is this OK?)
     *)
    sub_id: cint;

    (**
     * 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), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
     * - encoding: MUST be set by user.
     * - decoding: unused
     *)
    me_method: cint;

    (**
     * some codecs need / can use extradata 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
     * than extradata_size to avoid prolems if it is read with the bitstream reader.
     * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
     * - encoding: Set/allocated/freed by libavcodec.
     * - decoding: Set/allocated/freed by user.
     *)
    extradata: pbyte;
    extradata_size: cint;

    (**
     * 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 libavcodec.
     *)
    time_base: TAVRational;

    (* video only *)
    (**
     * picture width / height.
     * - encoding: MUST be set by user.
     * - decoding: Set by libavcodec.
     * Note: For compatibility it is possible to set this instead of
     * coded_width/height before decoding.
     *)
    width, height: cint;

    (**
     * the number of pictures in a group of pictures, or 0 for intra_only
     * - encoding: Set by user.
     * - decoding: unused
     *)
    gop_size: cint;

    (**
     * Pixel format, see PIX_FMT_xxx.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    pix_fmt: TAVPixelFormat;

    (**
     * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
     * has to read frames at native frame rate.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rate_emu: cint;

    (**
     * If non NULL, 'draw_horiz_band' is called by the libavcodec
     * decoder to draw a horizontal band. It improves cache usage. Not
     * all codecs can do that. You must check the codec capabilities
     * beforehand.
     * The function is also used by hardware acceleration APIs.
     * It is called at least once during frame decoding to pass
     * the data needed for hardware render.
     * In that mode instead of pixel data, AVFrame points to
     * a structure specific to the acceleration API. The application
     * reads the structure and can change some fields to indicate progress
     * or mark state.
     * - 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;
                                src: {const} PAVFrame; offset: PQuadIntArray;
                                y: cint; type_: cint; height: cint); cdecl;

    (* audio only *)
    sample_rate: cint; ///< samples per second
    channels: cint;    ///< number of audio channels
    
    (**
     * audio sample format
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    sample_fmt: TSampleFormat;  ///< sample format, currenly unused

    (* The following data should not be initialized. *)
    (**
     * Samples per packet, initialized when calling 'init'.
     *)
    frame_size: cint;
    frame_number: cint;   ///< audio or video frame number
{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
    real_pict_num: cint;  ///< returns the real picture number of previous encoded frame
{$IFEND}

    (**
     * Number of frames the decoded output will be delayed relative to
     * the encoded input.
     * - encoding: Set by libavcodec.
     * - decoding: unused
     *)
    delay: cint;

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

    (**
     * minimum quantizer
     * - encoding: Set by user.
     * - decoding: unused
     *)
    qmin: cint;

   (**
     * maximum quantizer
     * - encoding: Set by user.
     * - decoding: unused
     *)
   qmax: cint;

    (**
     * maximum quantizer difference between frames
     * - encoding: Set by user.
     * - decoding: unused
     *)
    max_qdiff: cint;

    (**
     * 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: cint;

    (**
     * qscale factor 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_factor: cfloat;

    (** obsolete FIXME remove *)
    rc_strategy: cint;

    b_frame_strategy: cint;

    (**
     * hurry up amount
     * - encoding: unused
     * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
     * @deprecated Deprecated in favor of skip_idct and skip_frame.
     *)
    hurry_up: cint;

    codec: PAVCodec;

    priv_data: pointer;

    {$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
    (* unused, FIXME remove*)
    rtp_mode: cint;
    {$IFEND}

    rtp_payload_size: cint;  (* 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: cint; mb_nb: cint); cdecl;

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

    (**
     * number of bits used for the previously encoded frame
     * - encoding: Set by libavcodec.
     * - decoding: unused
     *)
    frame_bits: cint;

    (**
     * 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 AnsiChar;
    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 work around some encoder bugs.
     * A demuxer should set this to what is stored in the field used to identify the codec.
     * If there are multiple such fields in a container then the demuxer should choose the one
     * which maximizes the information about the used codec.
     * If the codec tag field in a container is larger then 32 bits then the demuxer should
     * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
     * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
     * first.
     * - encoding: Set by user, if not then the default based on codec_id will be used.
     * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
     *)
    codec_tag: cuint;

    (**
     * Work around bugs in encoders which sometimes cannot be detected automatically.
     * - encoding: Set by user
     * - decoding: Set by user
     *)
    workaround_bugs: cint;

    (**
     * luma single coefficient elimination threshold
     * - encoding: Set by user.
     * - decoding: unused
     *)
    luma_elim_threshold: cint;

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

    (**
     * strictly follow the standard (MPEG4, ...).
     * - encoding: Set by user.
     * - decoding: Set by user.
     * Setting this to STRICT or higher means the encoder and decoder will
     * generally do stupid things. While setting it to inofficial or lower
     * will mean the encoder might use things that are not supported by all
     * spec compliant decoders. Decoders make no difference between normal,
     * inofficial and experimental, that is they always try to decode things
     * when they can unless they are explicitly asked to behave stupid
     * (=strictly conform to the specs)
     *)
    strict_std_compliance: cint;

    (**
     * qscale offset between IP and B-frames
     * - encoding: Set by user.
     * - decoding: unused
     *)
    b_quant_offset: cfloat;

    (**
     * Error recognization; higher values will detect more errors but may
     * misdetect some more or less valid parts as errors.
     * - encoding: unused
     * - decoding: Set by user.
     *)
    error_recognition: cint;

    (**
     * 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 libavcodec.
     * 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.
     * if CODEC_CAP_DR1 is not set then get_buffer() must call
     * avcodec_default_get_buffer() instead of providing buffers allocated by
     * some other means.
     * - encoding: unused
     * - decoding: Set by libavcodec., user can override.
     *)
    get_buffer: function (c: PAVCodecContext; pic: PAVFrame): cint; cdecl;

    (**
     * Called to release buffers which were 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 libavcodec., user can override.
     *)
    release_buffer: procedure (c: PAVCodecContext; pic: PAVFrame); cdecl;

    (**
     * Size of the frame reordering buffer in the decoder.
     * For MPEG-2 it is 1 IPB or 0 low delay IP.
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
    has_b_frames: cint;

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

    parse_only: cint; (* - 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: cint;

    (**
     * pass1 encoding statistics output buffer
     * - encoding: Set by libavcodec.
     * - decoding: unused
     *)
    stats_out: PByteArray;

    (**
     * 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: PByteArray;

    (**
     * 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: cfloat;

    rc_qmod_amp: cfloat;
    rc_qmod_freq: cint;

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

    (**
     * rate control equation
     * - encoding: Set by user
     * - decoding: unused
     *)
    rc_eq: {const} PByteArray; 

    (**
     * maximum bitrate
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_max_rate: cint;

    (**
     * minimum bitrate
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_min_rate: cint;

    (**
     * decoder bitstream buffer size
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_buffer_size: cint;
    rc_buffer_aggressivity: cfloat;

    (**
     * 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: cfloat;

    (**
     * qscale offset between P and I-frames
     * - encoding: Set by user.
     * - decoding: unused
     *)
    i_quant_offset: cfloat;

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

    (**
     * DCT algorithm, see FF_DCT_* below
     * - encoding: Set by user.
     * - decoding: unused
     *)
    dct_algo: cint;

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

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

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

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

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

    {$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
    (* for binary compatibility *)
    unused: cint;
    {$IFEND}

    (**
     * IDCT algorithm, see FF_IDCT_* below.
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    idct_algo: cint;

    (**
     * slice count
     * - encoding: Set by libavcodec.
     * - decoding: Set by user (or 0).
     *)
    slice_count: cint;

    (**
     * slice offsets in the frame in bytes
     * - encoding: Set/allocated by libavcodec.
     * - decoding: Set/allocated by user (or NULL).
     *)
    slice_offset: PCint;

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

    (**
     * dsp_mask could be add used to disable unwanted CPU features
     * CPU features (i.e. MMX, SSE. ...)
     *
     * With the 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: cuint;

    (**
     * bits per sample/pixel from the demuxer (needed for huffyuv).
     * - encoding: Set by libavcodec.
     * - decoding: Set by user.
     *)
     bits_per_coded_sample: cint;

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

    (**
     * sample aspect ratio (0 if unknown)
     * That is the width of a pixel divided by the height of the pixel.
     * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    sample_aspect_ratio: TAVRational;

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

    (**
     * debug
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    debug: cint;

    (**
     * debug
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    debug_mv: cint;

    (**
     * error
     * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
     * - decoding: unused
     *)
    error: array [0..3] of cuint64;

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

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

    (**
     * motion estimation comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_cmp: cint;

    (**
     * subpixel motion estimation comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_sub_cmp: cint;
    (**
     * macroblock comparison function (not supported yet)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mb_cmp: cint;
    (**
     * interlaced DCT comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    ildct_cmp: cint;

    (**
     * ME diamond size & shape
     * - encoding: Set by user.
     * - decoding: unused
     *)
    dia_size: cint;

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

    (**
     * prepass for motion estimation
     * - encoding: Set by user.
     * - decoding: unused
     *)
    pre_me: cint;

    (**
     * motion estimation prepass comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_pre_cmp: cint;

    (**
     * ME prepass diamond size & shape
     * - encoding: Set by user.
     * - decoding: unused
     *)
    pre_dia_size: cint;

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

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

    (**
     * DTG active format information (additional aspect ratio
     * information only used in DVB MPEG-2 transport streams)
     * 0 if not set.
     *
     * - encoding: unused
     * - decoding: Set by decoder.
     *)
    dtg_active_format: cint;

    (**
     * maximum motion estimation search range in subpel units
     * If 0 then no limit.
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_range: cint;

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

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

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

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

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

    (**
     * Global quality for codecs which cannot change it per frame.
     * This should be proportional to MPEG-1/2/4 qscale.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    global_quality: cint;

    (**
     * coder type
     * - encoding: Set by user.
     * - decoding: unused
     *)
    coder_type: cint;

    (**
     * context model
     * - encoding: Set by user.
     * - decoding: unused
     *)
    context_model: cint;

    {
    (**
     *
     * - encoding: unused
     * - decoding: Set by user.
     *)
    realloc: function (s: PAVCodecContext; buf: Pbyte; buf_size: cint): Pbyte; cdecl;
    }

    (**
     * slice flags
     * - encoding: unused
     * - decoding: Set by user.
     *)
    slice_flags: cint;

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

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

    (**
     * custom intra quantization matrix
     * - encoding: Set by user, can be NULL.
     * - decoding: Set by libavcodec.
     *)
    intra_matrix: PWord;

    (**
     * custom inter quantization matrix
     * - encoding: Set by user, can be NULL.
     * - decoding: Set by libavcodec.
     *)
    inter_matrix: PWord;

    (**
     * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * This is used to work around some encoder bugs.
     * - encoding: unused
     * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
     *)
    stream_codec_tag: array [0..3] of AnsiChar; //cuint;

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

    (**
     * minimum Lagrange multipler
     * - encoding: Set by user.
     * - decoding: unused
     *)
    lmin: cint;

    (**
     * maximum Lagrange multipler
     * - encoding: Set by user.
     * - decoding: unused
     *)
    lmax: cint;

    (**
     * 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: cint;

    (**
     * Called at the beginning of a frame to get cr buffer for it.
     * Buffer type (size, hints) must be the same. libavcodec won't check it.
     * libavcodec 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().
     * if CODEC_CAP_DR1 is not set then reget_buffer() must call
     * avcodec_default_reget_buffer() instead of providing buffers allocated by
     * some other means.
     * - encoding: unused
     * - decoding: Set by libavcodec., user can override
     *)
    reget_buffer: function (c: PAVCodecContext; pic: PAVFrame): cint; 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: cint;

    (**
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    inter_threshold: cint;

    (**
     * CODEC_FLAG2_*
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    flags2: cint;

    (**
     * Simulates errors in the bitstream to test error concealment.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    error_rate: cint;

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

    (**
     * quantizer noise shaping
     * - encoding: Set by user.
     * - decoding: unused
     *)
    quantizer_noise_shaping: cint;

    (**
     * thread count
     * is used to decide how many independent tasks should be passed to execute()
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    thread_count: cint;

    (**
     * The codec may call this to execute several independent 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 libavcodec, user can override.
     * - decoding: Set by libavcodec, user can override.
     *)
    {$IF LIBAVCODEC_VERSION < 52004000} // < 52.4.0
    execute: function (c: PAVCodecContext; func: TExecuteFunc; arg: PPointer; ret: PCint; count: cint): cint; cdecl;
    {$ELSE}
    execute: function (c: PAVCodecContext; func: TExecuteFunc; arg: Pointer; ret: PCint; count: cint; size: cint): cint; cdecl;
    {$IFEND}

    (**
     * 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 below which no motion estimation is
     * performed, but instead the user specified motion vectors are used.
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
     me_threshold: cint;

    (**
     * Macroblock threshold below which the user specified macroblock types will be used.
     * - encoding: Set by user.
     * - decoding: unused
     *)
     mb_threshold: cint;

    (**
     * precision of the intra DC coefficient - 8
     * - encoding: Set by user.
     * - decoding: unused
     *)
     intra_dc_precision: cint;

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

    (**
     * Number of macroblock rows at the top which are skipped.
     * - encoding: unused
     * - decoding: Set by user.
     *)
     skip_top: cint;

    (**
     * Number of macroblock rows at the bottom which are skipped.
     * - encoding: unused
     * - decoding: Set by user.
     *)
     skip_bottom: cint;

    (**
     * profile
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
     profile: cint;

    (**
     * level
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
     level: cint;

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

    (**
     * Bitstream 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: cint;

    (**
     * frame skip threshold
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_threshold: cint;

    (**
     * frame skip factor
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_factor: cint;

    (**
     * frame skip exponent
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_exp: cint;

    (**
     * frame skip comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_cmp: cint;

    (**
     * Border processing masking, raises the quantizer for mbs on the borders
     * of the picture.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    border_masking: cfloat;

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

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

    (**
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_penalty_compensation: cint;

    (**
     *
     * - 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: cint;

    (**
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    brd_scale: cint;

    (**
     * constant rate factor - quality-based VBR - values ~correspond to qps
     * - encoding: Set by user.
     * - decoding: unused
     *)
    {$IF LIBAVCODEC_VERSION >= 51021000} // 51.21.0
    crf: cfloat;
    {$ELSE}
    crf: cint;
    {$IFEND}

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

    (**
     * minimum GOP size
     * - encoding: Set by user.
     * - decoding: unused
     *)
    keyint_min: cint;

    (**
     * number of reference frames
     * - encoding: Set by user.
     * - decoding: Set by lavc.
     *)
    refs: cint;

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

    (**
     * Influences how often B-frames are used.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    bframebias: cint;

    (**
     * trellis RD quantization
     * - encoding: Set by user.
     * - decoding: unused
     *)
    trellis: cint;

    (**
     * Reduce fluctuations in qp (before curve compression).
     * - encoding: Set by user.
     * - decoding: unused
     *)
    complexityblur: cfloat;

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

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

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

    (**
     * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    directpred: cint;

    (**
     * Audio cutoff bandwidth (0 means "automatic")
     * - encoding: Set by user.
     * - decoding: unused
     *)
    cutoff: cint;

    (**
     * Multiplied by qscale for each frame and added to scene_change_score.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    scenechange_factor: cint;

    (**
     *
     * Note: Value depends upon the compare function used for fullpel ME.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mv0_threshold: cint;

    (**
     * Adjusts sensitivity of b_frame_strategy 1.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    b_sensitivity: cint;

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    compression_level: cint;

    (**
     * Sets whether to use LPC mode - used by FLAC encoder.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    use_lpc: cint;

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

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    min_prediction_order: cint;

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    max_prediction_order: cint;

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

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    min_partition_order: cint;

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    max_partition_order: cint;

    {$IF LIBAVCODEC_VERSION >= 51026000} // 51.26.0
    (**
     * GOP timecode frame start number, in non drop frame format
     * - encoding: Set by user.
     * - decoding: unused
     *)
    timecode_frame_start: cint64;
    {$IFEND}

    {$IF LIBAVCODEC_VERSION >= 51042000} // 51.42.0
    {$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
    (**
     * Decoder should decode to this many channels if it can (0 for default)
     * - encoding: unused
     * - decoding: Set by user.
     * @deprecated Deprecated in favor of request_channel_layout.
     *)
    request_channels: cint;
    {$IFEND}
    {$IFEND}

    {$IF LIBAVCODEC_VERSION > 51049000} // > 51.49.0
    (**
     * Percentage of dynamic range compression to be applied by the decoder.
     * The default value is 1.0, corresponding to full compression.
     * - encoding: unused
     * - decoding: Set by user.
     *)
    drc_scale: cfloat;
    {$IFEND}

    {$IF LIBAVCODEC_VERSION >= 51068000} // 51.68.0
    (**
     * opaque 64bit number (generally a PTS) that will be reordered and
     * output in AVFrame.reordered_opaque
     * - encoding: unused
     * - decoding: Set by user.
     *)
    reordered_opaque: cint64;
    {$IFEND}
    
    {$IF LIBAVCODEC_VERSION >= 52028000} // 52.28.0
    (**
     * This defines the location of chroma samples.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
     chroma_sample_location: TAVChromaLocation;
    {$IFEND}
  end;

(**
 * AVCodec.
 *)
  TAVCodec = record
    name: PAnsiChar;
    type_: TCodecType;
    id: TCodecID;
    priv_data_size: cint;
    init: function (avctx: PAVCodecContext): cint; cdecl; (* typo corretion by the Creative CAT *)
    encode: function (avctx: PAVCodecContext; buf: PByteArray; buf_size: cint; data: pointer): cint; cdecl;
    close: function (avctx: PAVCodecContext): cint; cdecl;
    decode: function (avctx: PAVCodecContext; outdata: pointer; var outdata_size: cint;
    {$IF LIBAVCODEC_VERSION < 52025000} // 52.25.0
                      buf: {const} PByteArray; buf_size: cint): cint; cdecl;
    {$ELSE}
                      avpkt: PAVPacket): cint; cdecl;
    {$IFEND}
    (**
     * Codec capabilities.
     * see CODEC_CAP_*
     *)
    capabilities: cint;
    next: PAVCodec;
    (**
     * Flush buffers.
     * Will be called when seeking
     *)
    flush: procedure (avctx: PAVCodecContext); cdecl;
    supported_framerates: {const} PAVRational; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
    pix_fmts: {const} PAVPixelFormat;       ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
    {$IF LIBAVCODEC_VERSION >= 51055000} // 51.55.0
    (**
     * Descriptive name for the codec, meant to be more human readable than name.
     * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
     *)
    long_name: {const} PAnsiChar;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 51056000} // 51.56.0
    supported_samplerates: {const} PCint;       ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 51062000} // 51.62.0
    sample_fmts: {const} PSampleFormatArray;   ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52002000} // 52.2.0
    channel_layouts: {const} PCint64;         ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
    {$IFEND}
  end;

{$IF LIBAVCODEC_VERSION >= 52018000} // 52.18.0
(**
 * AVHWAccel.
 *)
  TAVHWAccel = record
    (**
     * Name of the hardware accelerated codec.
     * The name is globally unique among encoders and among decoders (but an
     * encoder and a decoder can share the same name).
     *)
    name: PAnsiChar;

    (**
     * Type of codec implemented by the hardware accelerator.
     *
     * See CODEC_TYPE_xxx
     *)
    type_: TCodecType;

    (**
     * Codec implemented by the hardware accelerator.
     *
     * See CODEC_ID_xxx
     *)
    id: TCodecID;

    (**
     * Supported pixel format.
     *
     * Only hardware accelerated formats are supported here.
     *)
    pix_fmt: {const} PAVPixelFormat; 

    (**
     * Hardware accelerated codec capabilities.
     * see FF_HWACCEL_CODEC_CAP_*
     *)
    capabilities: cint;

    next: PAVCodec;

    (**
     * Called at the beginning of each frame or field picture.
     *
     * Meaningful frame information (codec specific) is guaranteed to
     * be parsed at this point. This function is mandatory.
     *
     * Note that buf can be NULL along with buf_size set to 0.
     * Otherwise, this means the whole frame is available at this point.
     *
     * @param avctx the codec context
     * @param buf the frame data buffer base
     * @param buf_size the size of the frame in bytes
     * @return zero if successful, a negative value otherwise
     *)
    start_frame: function (avctx:    PAVCodecContext; 
                           buf:      PByteArray; 
                           buf_size: cint): cint; cdecl;

    (**
     * Callback for each slice.
     *
     * Meaningful slice information (codec specific) is guaranteed to
     * be parsed at this point. This function is mandatory.
     *
     * @param avctx the codec context
     * @param buf the slice data buffer base
     * @param buf_size the size of the slice in bytes
     * @return zero if successful, a negative value otherwise
     *)
    decode_slice: function (avctx:    PAVCodecContext;
                            buf:      PByteArray; 
                            buf_size: cint): cint; cdecl;

    (**
     * Called at the end of each frame or field picture.
     *
     * The whole picture is parsed at this point and can now be sent
     * to the hardware accelerator. This function is mandatory.
     *
     * @param avctx the codec context
     * @return zero if successful, a negative value otherwise
     *)
    end_frame: function (avctx: PAVCodecContext): cint; cdecl;
        
{$IF LIBAVCODEC_VERSION >= 52021000} // >= 52.21.0
    (**
     * Size of HW accelerator private data.
     *
     * Private data is allocated with av_mallocz() before
     * AVCodecContext.get_buffer() and deallocated after
     * AVCodecContext.release_buffer().
     *)
    priv_data_size: cint;
{$IFEND}
        
  end;
{$IFEND}

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

type
  TAVSubtitleType = (
    SUBTITLE_NONE,

    SUBTITLE_BITMAP,                ///< A bitmap, pict will be set

    (**
     * Plain text, the text field must be set by the decoder and is
     * authoritative. ass and pict fields may contain approximations.
     *)
    SUBTITLE_TEXT,

    (**
     * Formatted text, the ass field must be set by the decoder and is
     * authoritative. pict and text fields may contain approximations.
     *)
    SUBTITLE_ASS
  );

type
  PPAVSubtitleRect = ^PAVSubtitleRect;
  PAVSubtitleRect = ^TAVSubtitleRect;
  {$IF LIBAVCODEC_VERSION < 52010000} // < 52.10.0
  TAVSubtitleRect = record
    x: cuint16;
    y: cuint16;
    w: cuint16;
    h: cuint16;
    nb_colors: cuint16;
    linesize: cint;
    rgba_palette: PCuint32;
    bitmap: PCuint8;
  end;
  {$ELSE}
  TAVSubtitleRect = record
    x: cint;        ///< top left corner  of pict, undefined when pict is not set
    y: cint;        ///< top left corner  of pict, undefined when pict is not set
    w: cint;        ///< width            of pict, undefined when pict is not set
    h: cint;        ///< height           of pict, undefined when pict is not set
    nb_colors: cint; ///< number of colors in pict, undefined when pict is not set

    (**
     * data+linesize for the bitmap of this subtitle.
     * can be set for text/ass as well once they where rendered
     *)
    pict: TAVPicture;
    type_: TAVSubtitleType;

    text: PAnsiChar;                     ///< 0 terminated plain UTF-8 text

    (**
     * 0 terminated ASS/SSA compatible event line.
     * The pressentation of this is unaffected by the other values in this
     * struct.
     *)
    ass: PByteArray;
  end;
  {$IFEND}

  PPAVSubtitle = ^PAVSubtitle;
  PAVSubtitle = ^TAVSubtitle;
  TAVSubtitle = record
    format: cuint16; (* 0 = graphics *)
    start_display_time: cuint32; (* relative to packet pts, in ms *)
    end_display_time: cuint32; (* relative to packet pts, in ms *)
    num_rects: cuint;
    {$IF LIBAVCODEC_VERSION < 52010000} // < 52.10.0
    rects: PAVSubtitleRect;
    {$ELSE}
    rects: PPAVSubtitleRect;
    {$IFEND}
  end;

{$IF LIBAVCODEC_VERSION >= 52025000} // 52.25.0
{ packet functions  }

(**
 * @deprecated use NULL instead
 *)
procedure av_destruct_packet_nofree(pkt: PAVPacket);
  cdecl; external av__codec;

(*
 * Default packet destructor.
 *)
procedure av_destruct_packet(pkt: PAVPacket);
  cdecl; external av__codec;

(*
 * Initialize optional fields of a packet with default values.
 *
 * @param pkt packet
 *)
procedure av_init_packet(pkt: PAVPacket);
  cdecl; external av__codec;

(*
 * Allocate the payload of a packet and initialize its fields with
 * default values.
 *
 * @param pkt packet
 * @param size wanted payload size
 * @return 0 if OK, AVERROR_xxx otherwise
 *)
function av_new_packet(pkt: PAVPacket; size: cint): cint;
  cdecl; external av__codec;

(*
 * Reduce packet size, correctly zeroing padding
 *
 * @param pkt packet
 * @param size new size
 *)
procedure av_shrink_packet(pkt: PAVPacket; size: cint);
  cdecl; external av__codec;

(*
 * @warning This is a hack - the packet memory allocation stuff is broken. The
 * packet is allocated if it was not really allocated.
 *)
function av_dup_packet(pkt: PAVPacket): cint;
  cdecl; external av__codec;

(*
 * Free a packet.
 *
 * @param pkt packet to free
 *)
procedure av_free_packet(pkt: PAVPacket);
{$IF LIBAVCODEC_VERSION >=52028000} // 52.28.0
  cdecl; external av__codec;
{$IFEND}
{$IFEND}

(* resample.c *)

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

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

function audio_resample (s: PReSampleContext; output: PSmallint; input: PSmallint; nb_samples: cint): cint;
  cdecl; external av__codec;

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

(**
 * Initializes an audio resampler.
 * Note, if either rate is not an integer then simply scale both rates up so they are.
 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
 * @param linear If 1 then the used FIR filter will be linearly interpolated
                 between the 2 closest, if 0 the closest will be used
 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
 *)
function av_resample_init (out_rate: cint; in_rate: cint; filter_length: cint;
                           log2_phase_count: cint; linear: cint; cutoff: cdouble): PAVResampleContext;
  cdecl; external av__codec;

function av_resample (c: PAVResampleContext; dst: PSmallint; src: PSmallint; var consumed: cint;
                      src_size: cint; dst_size: cint; update_ctx: cint): cint;
  cdecl; external av__codec;

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

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

{$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
(* YUV420 format is assumed ! *)

(**
 * @deprecated Use the software scaler (swscale) instead.
 *)
function img_resample_init (output_width: cint; output_height: cint;
                           input_width: cint; input_height: cint): PImgReSampleContext;
  cdecl; external av__codec; deprecated;

(**
 * @deprecated Use the software scaler (swscale) instead.
 *)
function img_resample_full_init (owidth: cint; oheight: cint;
                                    iwidth: cint; iheight: cint;
                                    topBand: cint; bottomBand: cint;
                                    leftBand: cint; rightBand: cint;
                                    padtop: cint; padbottom: cint;
                                    padleft: cint; padright: cint): PImgReSampleContext;
  cdecl; external av__codec; deprecated;

(**
 * @deprecated Use the software scaler (swscale) instead.
 *)
procedure img_resample (s: PImgReSampleContext; output: PAVPicture; input: {const} PAVPicture);
  cdecl; external av__codec; deprecated;

(**
 * @deprecated Use the software scaler (swscale) instead.
 *)
procedure img_resample_close (s: PImgReSampleContext);
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * 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 Zero if successful, a negative value if not.
 *)
function avpicture_alloc (picture: PAVPicture; pix_fmt: TAVPixelFormat;
                          width: cint; height: cint): cint;
  cdecl; external av__codec;

(**
 * Free a picture previously allocated by avpicture_alloc().
 *
 * @param picture the AVPicture to be freed
 *)
procedure avpicture_free (picture: PAVPicture);
  cdecl; external av__codec;

(**
 * Fill in the AVPicture fields.
 * The fields of the given AVPicture are filled in by using the 'ptr' address
 * which points to the image data buffer. Depending on the specified picture
 * format, one or multiple image data pointers and line sizes will be set.
 * If a planar format is specified, several pointers will be set pointing to
 * the different picture planes and the line sizes of the different planes
 * will be stored in the lines_sizes array.
 * Call with ptr == NULL to get the required size for the ptr buffer.
 *
 * @param picture AVPicture whose fields are to be filled in
 * @param ptr Buffer which will contain or contains the actual image data
 * @param pix_fmt The format in which the picture data is stored.
 * @param width the width of the image in pixels
 * @param height the height of the image in pixels
 * @return size of the image data in bytes
 *)
function avpicture_fill (picture: PAVPicture; ptr: pointer;
                 pix_fmt: TAVPixelFormat; width: cint; height: cint): cint;
  cdecl; external av__codec;

function avpicture_layout (src: {const} PAVPicture; pix_fmt: TAVPixelFormat;
                   width: cint; height: cint;
                   dest: PByteArray; dest_size: cint): cint;
  cdecl; external av__codec;

(**
 * Calculate the size in bytes that a picture of the given width and height
 * would occupy if stored in the given picture format.
 * Note that this returns the size of a compact representation as generated
 * by avpicture_layout, which can be smaller than the size required for e.g.
 * avpicture_fill.
 *
 * @param pix_fmt the given picture format
 * @param width the width of the image
 * @param height the height of the image
 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
 *)
function avpicture_get_size (pix_fmt: TAVPixelFormat; width: cint; height: cint): cint;
  cdecl; external av__codec;

procedure avcodec_get_chroma_sub_sample (pix_fmt: TAVPixelFormat; var h_shift: cint; var v_shift: cint);
  cdecl; external av__codec;

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

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

(**
 * Returns the pixel format corresponding to the name name.
 *
 * If there is no pixel format with name name, then looks for a
 * pixel format with the name corresponding to the native endian
 * format of name.
 * For example in a little-endian system, first looks for "gray16",
 * then for "gray16le".
 *
 * Finally if no pixel format has been found, returns PIX_FMT_NONE.
 *)
function avcodec_get_pix_fmt(name: {const} PAnsiChar): TAVPixelFormat;
  cdecl; external av__codec;

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

const
  FF_LOSS_RESOLUTION  = $0001; {**< loss due to resolution change *}
  FF_LOSS_DEPTH       = $0002; {**< loss due to color depth change *}
  FF_LOSS_COLORSPACE  = $0004; {**< loss due to color space conversion *}
  FF_LOSS_ALPHA       = $0008; {**< loss of alpha bits *}
  FF_LOSS_COLORQUANT  = $0010; {**< loss due to color quantization *}
  FF_LOSS_CHROMA      = $0020; {**< loss of chroma (e.g. RGB to gray conversion) *}

(**
 * Computes what kind of losses will occur when converting from one specific
 * pixel format to another.
 * When converting from one pixel format to another, information loss may occur.
 * For example, when converting from RGB24 to GRAY, the color information will
 * be lost. Similarly, other losses occur when converting from some formats to
 * other formats. These losses can involve loss of chroma, but also loss of
 * resolution, loss of color depth, loss due to the color space conversion, loss
 * of the alpha bits or loss due to color quantization.
 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
 * which will occur when converting from one pixel format to another.
 *
 * @param[in] dst_pix_fmt destination pixel format
 * @param[in] src_pix_fmt source pixel format
 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
 * @return Combination of flags informing you what kind of losses will occur.
 *)
function avcodec_get_pix_fmt_loss (dst_pix_fmt: TAVPixelFormat; src_pix_fmt: TAVPixelFormat;
                           has_alpha: cint): cint;
  cdecl; external av__codec;

(**
 * Finds the best pixel format to convert to given a certain source pixel
 * format.  When converting from one pixel format to another, information loss
 * may occur.  For example, when converting from RGB24 to GRAY, the color
 * information will be lost. Similarly, other losses occur when converting from
 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
 * the given pixel formats should be used to suffer the least amount of loss.
 * The pixel formats from which it chooses one, are determined by the
 * pix_fmt_mask parameter.
 *
 * @code
 * src_pix_fmt = PIX_FMT_YUV420P;
 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
 * @endcode
 *
 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
 * @param[in] src_pix_fmt source pixel format
 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
 * @return The best pixel format to convert to or -1 if none was found.
 *)
{$IF LIBAVCODEC_VERSION >= 52000000} // 52.0.0
function avcodec_find_best_pix_fmt(pix_fmt_mask: cint64; src_pix_fmt: TAVPixelFormat;
                            has_alpha: cint; loss_ptr: PCint): cint;
  cdecl; external av__codec;
{$ELSEIF LIBAVCODEC_VERSION < 52022001}
function avcodec_find_best_pix_fmt(pix_fmt_mask: cint; src_pix_fmt: TAVPixelFormat;
                            has_alpha: cint; loss_ptr: PCint): cint;
  cdecl; external av__codec;
{$ELSE}
function avcodec_find_best_pix_fmt(pix_fmt_mask: cint; src_pix_fmt: TAVPixelFormat;
                            has_alpha: cint; loss_ptr: PCint): TAVPixelFormat;
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 51041000} // 51.41.0
(**
 * Print in buf the string corresponding to the pixel format with
 * number pix_fmt, or an header if pix_fmt is negative.
 *
 * @param[in] buf the buffer where to write the string
 * @param[in] buf_size the size of buf
 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
 * a negative value to print the corresponding header.
 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
 *)
{$IF LIBAVCODEC_VERSION < 52022001} // 52.22.1
procedure avcodec_pix_fmt_string (buf: PAnsiChar; buf_size: cint; pix_fmt: cint);
  cdecl; external av__codec;
{$ELSE}
procedure avcodec_pix_fmt_string (buf: PAnsiChar; buf_size: cint; pix_fmt: TAVPixelFormat);
  cdecl; external av__codec;
{$IFEND}
{$IFEND}

const
  FF_ALPHA_TRANSP      = $0001; {* image has some totally transparent pixels *}
  FF_ALPHA_SEMI_TRANSP = $0002; {* image has some transparent pixels *}

(**
 * Tell if an image really has transparent alpha values.
 * @return ored mask of FF_ALPHA_xxx constants
 *)
function img_get_alpha_info (src: {const} PAVPicture;
                             pix_fmt: TAVPixelFormat;
                             width:   cint;
                             height:  cint): cint;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
(**
 * convert among pixel formats
 * @deprecated Use the software scaler (swscale) instead.
 *)
function img_convert (dst: PAVPicture; dst_pix_fmt: TAVPixelFormat;
              src: {const} PAVPicture; pix_fmt: TAVPixelFormat;
              width: cint; height: cint): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

(* deinterlace a picture *)
(* deinterlace - if not supported return -1 *)
function avpicture_deinterlace (dst: PAVPicture;
                        src: {const} PAVPicture;
                        pix_fmt: TAVPixelFormat;
                        width:   cint;
                        height:  cint): cint;
  cdecl; external av__codec;

{* external high level API *}

{$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
{
var
  first_avcodec: PAVCodec; external av__codec;
}
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 51049000} // 51.49.0
(**
 * If c is NULL, returns the first registered codec,
 * if c is non-NULL, returns the next registered codec after c,
 * or NULL if c is the last one.
 *)
function av_codec_next(c: PAVCodec): PAVCodec;
  cdecl; external av__codec;
{$IFEND}

(**
 * Returns the LIBAVCODEC_VERSION_INT constant.
 *)
function avcodec_version(): cuint;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION < 52008000} // 52.8.0
(* returns LIBAVCODEC_BUILD constant *)
function avcodec_build(): cuint;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Initializes libavcodec.
 *
 * @warning This function must be called before any other libavcodec
 * function.
 *)
procedure avcodec_init();
  cdecl; external av__codec;

(**
 * Register the codec codec and initialize libavcodec.
 *
 * @see avcodec_init()
 *)
{$IF LIBAVCODEC_VERSION >= 52014000} // 52.14.0
procedure avcodec_register(codec: PAVCodec);
  cdecl; external av__codec;
// Deprecated in favor of avcodec_register.
procedure register_avcodec(codec: PAVCodec);
  cdecl; external av__codec; deprecated;
{$ELSEIF LIBAVCODEC_VERSION_MAJOR < 53}
procedure register_avcodec(codec: PAVCodec);
  cdecl; external av__codec;
{$IFEND}
(**
 * Finds a registered encoder with a matching codec ID.
 *
 * @param id CodecID of the requested encoder
 * @return An encoder if one was found, NULL otherwise.
 *)
function avcodec_find_encoder(id: TCodecID): PAVCodec;
  cdecl; external av__codec;

(**
 * Finds a registered encoder with the specified name.
 *
 * @param name name of the requested encoder
 * @return An encoder if one was found, NULL otherwise.
 *)
function avcodec_find_encoder_by_name(name: PAnsiChar): PAVCodec;
  cdecl; external av__codec;

(**
 * Finds a registered decoder with a matching codec ID.
 *
 * @param id CodecID of the requested decoder
 * @return A decoder if one was found, NULL otherwise.
 *)
function avcodec_find_decoder(id: TCodecID): PAVCodec;
  cdecl; external av__codec;

(**
 * Finds a registered decoder with the specified name.
 *
 * @param name name of the requested decoder
 * @return A decoder if one was found, NULL otherwise.
 *)
function avcodec_find_decoder_by_name(name: PAnsiChar): PAVCodec;
  cdecl; external av__codec;
procedure avcodec_string(buf: PAnsiChar; buf_size: cint; enc: PAVCodecContext; encode: cint);
  cdecl; external av__codec;

(**
 * Sets the fields of the given AVCodecContext to default values.
 *
 * @param s The AVCodecContext of which the fields should be set to default values.
 *)
procedure avcodec_get_context_defaults(s: PAVCodecContext);
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION >= 51039000} // 51.39.0
(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
 *  we WILL change its arguments and name a few times! *)
procedure avcodec_get_context_defaults2(s: PAVCodecContext; ctype: TCodecType);
  cdecl; external av__codec;
{$IFEND}

(**
 * Allocates an AVCodecContext and sets its fields to default values.  The
 * resulting struct can be deallocated by simply calling av_free().
 *
 * @return An AVCodecContext filled with default values or NULL on failure.
 * @see avcodec_get_context_defaults
 *)
function avcodec_alloc_context(): PAVCodecContext;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION >= 51039000} // 51.39.0
(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
 *  we WILL change its arguments and name a few times! *)
function avcodec_alloc_context2(ctype: TCodecType): PAVCodecContext;
  cdecl; external av__codec;
{$IFEND}

(**
 * Sets the fields of the given AVFrame to default values.
 *
 * @param pic The AVFrame of which the fields should be set to default values.
 *)
procedure avcodec_get_frame_defaults (pic: PAVFrame);
  cdecl; external av__codec;

(**
 * Allocates an AVFrame and sets its fields to default values.  The resulting
 * struct can be deallocated by simply calling av_free().
 *
 * @return An AVFrame filled with default values or NULL on failure.
 * @see avcodec_get_frame_defaults
 *)
function avcodec_alloc_frame(): PAVFrame;
  cdecl; external av__codec;

function avcodec_default_get_buffer (s: PAVCodecContext; pic: PAVFrame): cint;
  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): cint;
  cdecl; external av__codec;
procedure avcodec_align_dimensions(s: PAVCodecContext; width: PCint; height: PCint);
  cdecl; external av__codec;

(**
 * Checks if the given dimension of a picture is valid, meaning that all
 * bytes of the picture can be addressed with a signed int.
 *
 * @param[in] w Width of the picture.
 * @param[in] h Height of the picture.
 * @return Zero if valid, a negative value if invalid.
 *)
function avcodec_check_dimensions(av_log_ctx: pointer; w: cuint; h: cuint): cint;
  cdecl; external av__codec;
function avcodec_default_get_format(s: PAVCodecContext; fmt: {const} PAVPixelFormat): TAVPixelFormat;
  cdecl; external av__codec;

function avcodec_thread_init(s: PAVCodecContext; thread_count: cint): cint;
  cdecl; external av__codec;
procedure avcodec_thread_free(s: PAVCodecContext);
  cdecl; external av__codec;


{$IF LIBAVCODEC_VERSION < 52004000} // < 52.4.0
function avcodec_thread_execute(s: PAVCodecContext; func: TExecuteFunc; arg: PPointer; var ret: cint; count: cint): cint;
  cdecl; external av__codec;
{$ELSE}
function avcodec_thread_execute(s: PAVCodecContext; func: TExecuteFunc; arg: Pointer; var ret: cint; count: cint; size: cint): cint;
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_VERSION < 52004000} // < 52.4.0
function avcodec_default_execute(s: PAVCodecContext; func: TExecuteFunc; arg: PPointer; var ret: cint; count: cint): cint;
  cdecl; external av__codec;
{$ELSE}
function avcodec_default_execute(s: PAVCodecContext; func: TExecuteFunc; arg: Pointer; var ret: cint; count: cint; size: cint): cint;
  cdecl; external av__codec;
{$IFEND}
//FIXME func typedef

(**
 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
 * function the context has to be allocated.
 *
 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
 * retrieving a codec.
 *
 * @warning This function is not thread safe!
 *
 * @code
 * avcodec_register_all();
 * codec = avcodec_find_decoder(CODEC_ID_H264);
 * if (!codec)
 *     exit(1);
 *
 * context = avcodec_alloc_context();
 *
 * if (avcodec_open(context, codec) < 0)
 *     exit(1);
 * @endcode
 *
 * @param avctx The context which will be set up to use the given codec.
 * @param codec The codec to use within the context.
 * @return zero on success, a negative value on error
 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
 *)
function avcodec_open(avctx: PAVCodecContext; codec: PAVCodec): cint;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION < 52000000} // < 52.0.0
(**
 * @deprecated Use avcodec_decode_audio2 instead.
 *)
function avcodec_decode_audio(avctx: PAVCodecContext; samples: PSmallint;
                           var frame_size_ptr: cint;
                           buf: {const} PByteArray; buf_size: cint): cint;
  cdecl; external av__codec; {deprecated;}
{$IFEND}

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
{$IF LIBAVCODEC_VERSION >= 51030000} // 51.30.0
(**
 * Decodes an audio frame from buf into samples.
 * Wrapper function which calls avcodec_decode_audio3.
 *
 * @deprecated Use avcodec_decode_audio3 instead.
 * @param avctx the codec context
 * @param[out] samples the output buffer
 * @param[in,out] frame_size_ptr the output buffer size in bytes
 * @param[in] buf the input buffer
 * @param[in] buf_size the input buffer size in bytes
 * @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_audio2(avctx: PAVCodecContext; samples: PSmallint;
               var frame_size_ptr: cint;
               buf: {const} PByteArray; buf_size: cint): cint;
  cdecl; external av__codec; {deprecated;}
{$IFEND}
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 52025000} // 52.25.0
(**
 * Decodes the audio frame of size avpkt->size from avpkt->data into samples.
 * Some decoders may support multiple frames in a single AVPacket, such
 * decoders would then just decode the first frame.
 * If no frame
 * could be decompressed, frame_size_ptr is zero. Otherwise, it is the
 * decompressed frame size in bytes.
 *
 * @warning You must set frame_size_ptr to the allocated size of the
 * output buffer before calling avcodec_decode_audio3().
 *
 * @warning The input buffer must be 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 avpkt->data should be set to 0 to ensure that
 * no overreading happens for damaged MPEG streams.
 *
 * @note You might have to align the input buffer avpkt->data and output buffer
 * 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, avpkt->data should have 4 byte alignment at minimum and
 * samples should be 16 byte aligned unless the CPU doesn't need it
 * (AltiVec and SSE do).
 *
 * @note Some codecs have a delay between input and output, these need to be
 * feeded with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
 *
 * @param avctx the codec context
 * @param[out] samples the output buffer
 * @param[in,out] frame_size_ptr the output buffer size in bytes
 * @param[in] avpkt The input AVPacket containing the input buffer.
 *            You can create such packet with av_init_packet() and by then setting
 *            data and size, some decoders might in addition need other fields.
 *            All decoders are designed to use the least fields possible though.
 * @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_audio3(avctx: PAVCodecContext; samples: PSmallint;
               var frame_size_ptr: cint;
               avpkt: PAVPacket): cint;
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
(**
 * Decodes a video frame from buf into picture.
 * Wrapper function which calls avcodec_decode_video2.
 *
 * @deprecated Use avcodec_decode_video2 instead.
 * @param avctx the codec context
 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
 * @param[in] buf the input buffer
 * @param[in] buf_size the size of the input buffer in bytes
 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
 * @return On error a negative value is returned, otherwise the number of bytes
 * used or zero if no frame could be decompressed.
 *)
function avcodec_decode_video(avctx: PAVCodecContext; picture: PAVFrame;
                       var got_picture_ptr: cint;
                       buf: {const} PByteArray; buf_size: cint): cint;
  cdecl; external av__codec; {deprecated;}
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 52025000} // 52.25.0
(**
 * Decodes the video frame of size avpkt->size from avpkt->data into picture.
 * Some decoders may support multiple frames in a single AVPacket, such
 * decoders would then just decode the first frame.
 *
 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
 * the actual read bytes because some optimized bitstream readers read 32 or 64
 * bits at once and could read over the end.
 *
 * @warning The end of the input buffer buf should be set to 0 to ensure that
 * no overreading happens for damaged MPEG streams.
 *
 * @note You might have to align the input buffer avpkt->data.
 * The alignment requirements depend on the CPU: on some CPUs it isn't
 * necessary at all, on others it won't work at all if not aligned and on others
 * it will work but it will have an impact on performance.
 *
 * In practice, avpkt->data should have 4 byte alignment at minimum.
 *
 * @param avctx the codec context
 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
 * @param[in] avpkt The input AVpacket containing the input buffer.
 *            You can create such packet with av_init_packet() and by then setting
 *            data and size, some decoders might in addition need other fields like
 *            flags&PKT_FLAG_KEY. All decoders are designed to use the least
 *            fields possible.
 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
 * @return On error a negative value is returned, otherwise the number of bytes
 * used or zero if no frame could be decompressed.
 *)
function avcodec_decode_video2(avctx: PAVCodecContext; picture: PAVFrame;
                       var got_picture_ptr: cint;
                       avpkt: PAVPacket): cint;
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
(* Decode a subtitle message. Return -1 if error, otherwise return the
 * number of bytes used. If no subtitle could be decompressed,
 * got_sub_ptr is zero. Otherwise, the subtitle is stored in*sub.
 *)
function avcodec_decode_subtitle(avctx: PAVCodecContext; sub: PAVSubtitle;
                          var got_sub_ptr: cint;
                          buf: {const} PByteArray; buf_size: cint): cint;
  cdecl; external av__codec;
{$IFEND}
  
{$IF LIBAVCODEC_VERSION >= 52025000} // 52.25.0
(* Decodes a subtitle message.
 * Returns a negative value on error, otherwise returns the number of bytes used.
 * If no subtitle could be decompressed, got_sub_ptr is zero.
 * Otherwise, the subtitle is stored in sub.
 *
 * @param avctx the codec context
 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored.
 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
 * @param[in] avpkt The input AVPacket containing the input buffer.
 *)
function avcodec_decode_subtitle2(avctx: PAVCodecContext; sub: PAVSubtitle;
                          var got_sub_ptr: cint;
                          avpkt: PAVPacket): cint;
  cdecl; external av__codec;
{$IFEND}
  
function avcodec_parse_frame(avctx: PAVCodecContext; pdata: PPointer;
                      data_size_ptr: PCint;
                      buf: PByteArray; buf_size: cint): cint;
  cdecl; external av__codec;

(**
 * Encodes an audio frame from samples into buf.
 *
 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
 * However, for PCM audio the user will know how much space is needed
 * because it depends on the value passed in buf_size as described
 * below. In that case a lower value can be used.
 *
 * @param avctx the codec context
 * @param[out] buf the output buffer
 * @param[in] buf_size the output buffer size
 * @param[in] samples the input buffer containing the samples
 * The number of samples read from this buffer is frame_size*channels,
 * both of which are defined in avctx.
 * For PCM audio the number of samples read from samples is equal to
 * buf_size * input_sample_size / output_sample_size.
 * @return On error a negative value is returned, on success zero or the number
 * of bytes used to encode the data read from the input buffer.
 *)
function avcodec_encode_audio(avctx: PAVCodecContext; buf: PByte;
                      buf_size: cint; samples: {const} PSmallint): cint;
  cdecl; external av__codec;

(**
 * Encodes a video frame from pict into buf.
 * The input picture should be
 * stored using a specific format, namely avctx.pix_fmt.
 *
 * @param avctx the codec context
 * @param[out] buf the output buffer for the bitstream of encoded frame
 * @param[in] buf_size the size of the output buffer in bytes
 * @param[in] pict the input picture to encode
 * @return On error a negative value is returned, on success zero or the number
 * of bytes used from the output buffer.
 *)
function avcodec_encode_video(avctx: PAVCodecContext; buf: PByte;
                      buf_size: cint; pict: PAVFrame): cint;
  cdecl; external av__codec;
function avcodec_encode_subtitle(avctx: PAVCodecContext; buf: PByteArray;
                      buf_size: cint; sub: {const} PAVSubtitle): cint;
  cdecl; external av__codec;

function avcodec_close(avctx: PAVCodecContext): cint;
  cdecl; external av__codec;

(**
 * Register all the codecs, parsers and bitstream filters which were enabled at
 * configuration time. If you do not call this function you can select exactly
 * which formats you want to support, by using the individual registration
 * functions.
 *
 * @see register_avcodec
 * @see avcodec_register
 * @see av_register_codec_parser
 * @see av_register_bitstream_filter
 *)
procedure avcodec_register_all();
  cdecl; external av__codec;

(**
 * Flush buffers, should be called when seeking or when switching to a different stream.
 *)
procedure avcodec_flush_buffers(avctx: PAVCodecContext);
  cdecl; external av__codec;
  
procedure avcodec_default_free_buffers(s: PAVCodecContext);
  cdecl; external av__codec;

(* misc useful functions *)

(**
 * Returns a single letter to describe the given picture type pict_type.
 *
 * @param[in] pict_type the picture type
 * @return A single character representing the picture type.
 *)
function av_get_pict_type_char(pict_type: cint): AnsiChar;
  cdecl; external av__codec;

(**
 * Returns codec bits per sample.
 *
 * @param[in] codec_id the codec
 * @return Number of bits per sample or zero if unknown for the given codec.
 *)
function av_get_bits_per_sample(codec_id: TCodecID): cint;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION >= 51041000} // 51.41.0
(**
 * Returns sample format bits per sample.
 *
 * @param[in] sample_fmt the sample format
 * @return Number of bits per sample or zero if unknown for the given sample format.
 *)
function av_get_bits_per_sample_format(sample_fmt: TSampleFormat): cint;
  cdecl; external av__codec;
{$IFEND}

const
  AV_PARSER_PTS_NB      = 4;
  PARSER_FLAG_COMPLETE_FRAMES = $0001;

type
  {* frame parsing *}
  PAVCodecParserContext = ^TAVCodecParserContext;
  PAVCodecParser = ^TAVCodecParser;

  TAVCodecParserContext = record
    priv_data: pointer;
    parser: PAVCodecParser;
    frame_offset: cint64; (* offset of the current frame *)
    cur_offset: cint64; (* current offset (incremented by each av_parser_parse()) *)
    next_frame_offset: cint64; (* offset of the next frame *)
    (* video info *)
    pict_type: cint; (* XXX: put it back in AVCodecContext *)
    (**
     * This field is used for proper frame duration computation in lavf.
     * It signals, how much longer the frame duration of the current frame
     * is compared to normal frame duration.
     *
     * frame_duration = (1 + repeat_pict) * time_base
     *
     * It is used by codecs like H.264 to display telecined material.
     *)
    repeat_pict: cint; (* XXX: put it back in AVCodecContext *)
    pts: cint64;     (* pts of the current frame *)
    dts: cint64;     (* dts of the current frame *)

    (* private data *)
    last_pts: cint64;
    last_dts: cint64;
    fetch_timestamp: cint;

    cur_frame_start_index: cint;
    cur_frame_offset: array [0..AV_PARSER_PTS_NB - 1] of cint64;
    cur_frame_pts: array [0..AV_PARSER_PTS_NB - 1] of cint64;
    cur_frame_dts: array [0..AV_PARSER_PTS_NB - 1] of cint64;

    flags: cint;

    {$IF LIBAVCODEC_VERSION >= 51040003} // 51.40.3
    offset: cint64;      ///< byte offset from starting packet start
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 51057001} // 51.57.1
    cur_frame_end: array [0..AV_PARSER_PTS_NB - 1] of cint64;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52016000} // 52.16.0
    (*!
     * Set by parser to 1 for key frames and 0 for non-key frames.
     * It is initialized to -1, so if the parser doesn't set this flag,
     * old-style fallback using FF_I_TYPE picture type as key frames
     * will be used.
     *)
    key_frame: cint;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52018000} // 52.18.0
    (**
     * Time difference in stream time base units from the pts of this
     * packet to the point at which the output from the decoder has converged
     * independent from the availability of previous frames. That is, the
     * frames are virtually identical no matter if decoding started from
     * the very first frame or from this keyframe.
     * Is AV_NOPTS_VALUE if unknown.
     * This field is not the display duration of the current frame.
     *
     * The purpose of this field is to allow seeking in streams that have no
     * keyframes in the conventional sense. It corresponds to the
     * recovery point SEI in H.264 and match_time_delta in NUT. It is also
     * essential for some types of subtitle streams to ensure that all
     * subtitles are correctly displayed after seeking.
     *)
    convergence_duration: cint64;
    {$IFEND}
    {$IF LIBAVCODEC_VERSION >= 52019000} // 52.19.0
    // Timestamp generation support:
    (**
     * Synchronization point for start of timestamp generation.
     *
     * Set to >0 for sync point, 0 for no sync point and <0 for undefined
     * (default).
     *
     * For example, this corresponds to presence of H.264 buffering period
     * SEI message.
     *)
    dts_sync_point: cint;

    (**
     * Offset of the current timestamp against last timestamp sync point in
     * units of AVCodecContext.time_base.
     *
     * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
     * contain a valid timestamp offset.
     *
     * Note that the timestamp of sync point has usually a nonzero
     * dts_ref_dts_delta, which refers to the previous sync point. Offset of
     * the next frame after timestamp sync point will be usually 1.
     *
     * For example, this corresponds to H.264 cpb_removal_delay.
     *)
    dts_ref_dts_delta: cint;

    (**
     * Presentation delay of current frame in units of AVCodecContext.time_base.
     *
     * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
     * contain valid non-negative timestamp delta (presentation time of a frame
     * must not lie in the past).
     *
     * This delay represents the difference between decoding and presentation
     * time of the frame.
     *
     * For example, this corresponds to H.264 dpb_output_delay.
     *)
    pts_dts_delta: cint;
    {$IFEND}

    {$IF LIBAVCODEC_VERSION >= 52021000} // 52.21.0
    (**
     * Position of the packet in file.
     *
     * Analogous to cur_frame_pts/dts
     *)
    cur_frame_pos: array [0..AV_PARSER_PTS_NB - 1] of cint64;

    (**
     * Byte position of currently parsed frame in stream.
     *)
    pos: cint64;

    (**
     * Previous frame byte position.
     *)
    last_pos: cint64;
    {$IFEND}
  end;

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


{$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
{
var
  av_first_parser: PAVCodecParser; external av__codec;
}
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 51049000} // 51.49.0
function av_parser_next(c: PAVCodecParser): PAVCodecParser;
  cdecl; external av__codec;
{$IFEND}

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

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

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
function av_parser_parse(s: PAVCodecParserContext;
                  avctx: PAVCodecContext;
                  poutbuf: PPointer;
                  poutbuf_size: PCint;
                  buf: {const} PByteArray;
                  buf_size: cint;
                  pts: cint64;
                  dts: cint64): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 52021000} // 52.21.0
(**
 * Parse a packet.
 *
 * @param s             parser context.
 * @param avctx         codec context.
 * @param poutbuf       set to pointer to parsed buffer or NULL if not yet finished.
 * @param poutbuf_size  set to size of parsed buffer or zero if not yet finished.
 * @param buf           input buffer.
 * @param buf_size      input length, to signal EOF, this should be 0 (so that the last frame can be output).
 * @param pts           input presentation timestamp.
 * @param dts           input decoding timestamp.
 * @param pos           input byte position in stream.
 * @return the number of bytes of the input bitstream used.
 *
 * Example:
 * @code
 *   while (in_len) do
 *   begin
 *     len := av_parser_parse2(myparser, AVCodecContext, data, size,
 *                                       in_data, in_len,
 *                                       pts, dts, pos);
 *      in_data := in_data + len;
 *      in_len  := in_len  - len;
 *
 *      if (size) then
 *        decode_frame(data, size);
 *   end;
 * @endcode
 *)
function av_parser_parse2(s:    PAVCodecParserContext;
                  avctx:        PAVCodecContext;
                  poutbuf:      PPointer;
                  poutbuf_size: PCint;
                  buf: {const}  PByteArray;
                  buf_size:     cint;
                  pts:          cint64;
                  dts:          cint64;
                  pos:          cint64): cint;
   cdecl; external av__codec;
{$IFEND}

function av_parser_change(s: PAVCodecParserContext;
                   avctx: PAVCodecContext;
                   poutbuf: PPointer; poutbuf_size: PCint;
                   buf: {const} PByteArray; buf_size: cint; keyframe: cint): cint;
  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: PAnsiChar;
    priv_data_size: cint;
    filter: function(bsfc: PAVBitStreamFilterContext;
                  avctx: PAVCodecContext; args: PByteArray;
                  poutbuf: PPointer; poutbuf_size: PCint;
                  buf: PByte; buf_size: cint; keyframe: cint): cint; cdecl;
    {$IF LIBAVCODEC_VERSION >= 51043000} // 51.43.0
    close: procedure(bsfc: PAVBitStreamFilterContext);
    {$IFEND}
    next: PAVBitStreamFilter;
  end;

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

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

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

{$IF LIBAVCODEC_VERSION >= 51049000} // 51.49.0
function av_bitstream_filter_next(f: PAVBitStreamFilter): PAVBitStreamFilter;
  cdecl; external av__codec;
{$IFEND}

(* memory *)

(**
 * Reallocates the given block if it is not large enough, otherwise it
 * does nothing.
 *
 * @see av_realloc
 *)
procedure av_fast_realloc(ptr: pointer; size: PCuint; min_size: cuint);
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION < 52025000} // 52.25.0
(**
 * Allocates a buffer, reusing the given one if large enough.
 *
 * Contrary to av_fast_realloc the current buffer contents might not be
 * preserved and on error the old buffer is freed, thus no special
 * handling to avoid memleaks is necessary.
 *
 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
 * @param size size of the buffer *ptr points to
 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
 *                 *size 0 if an error occurred.
 *)
procedure av_fast_malloc(ptr: pointer; size: PCuint; min_size: cuint);
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_VERSION < 51057000} // 51.57.0
(* for static data only *)

(**
 * Frees all static arrays and resets their pointers to 0.
 * Call this function to release all statically allocated tables.
 *
 * @deprecated. Code which uses av_free_static is broken/misdesigned
 * and should correctly use static arrays
 *
 *)
procedure av_free_static();
  cdecl; external av__codec; deprecated;

(**
 * Allocation of static arrays.
 *
 * @warning Do not use for normal allocation.
 *
 * @param[in] size The amount of memory you need in bytes.
 * @return block of memory of the requested size
 * @deprecated. Code which uses av_mallocz_static is broken/misdesigned
 * and should correctly use static arrays
 *)
procedure av_mallocz_static(size: cuint);
  cdecl; external av__codec; deprecated; {av_malloc_attrib av_alloc_size(1)}
{$IFEND}

{$IF LIBAVCODEC_VERSION < 51035000} // 51.35.0
procedure av_realloc_static(ptr: pointer; size: cuint);
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 51039000} // 51.39.0
(**
 * Copy image 'src' to 'dst'.
 *)
procedure av_picture_copy(dst: PAVPicture; 
              src: {const} PAVPicture;
{$IF LIBAVCODEC_VERSION < 52022001} // 52.22.1
              pix_fmt: cint;
{$ELSE}
              pix_fmt: TAVPixelFormat;
{$IFEND}
              width:  cint;
              height: cint);
  cdecl; external av__codec;

(**
 * Crop image top and left side.
 *)
function av_picture_crop(dst: PAVPicture;
              src: {const} PAVPicture;
{$IF LIBAVCODEC_VERSION < 52022001} // 52.22.1
              pix_fmt: cint;
{$ELSE}
              pix_fmt: TAVPixelFormat;
{$IFEND}
              top_band:  cint;
              left_band: cint): cint;
  cdecl; external av__codec;

(**
 * Pad image.
 *)
function av_picture_pad(dst: PAVPicture;
            src: {const} PAVPicture;
            height: cint;
            width: cint;
{$IF LIBAVCODEC_VERSION < 52022001} // 52.22.1
            pix_fmt: cint;
{$ELSE}
            pix_fmt: TAVPixelFormat;
{$IFEND}
            padtop: cint;
            padbottom: cint;
            padleft: cint;
            padright:
            cint;
            color: PCint): cint;
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_VERSION < 52000000} // 52.0.0
(**
 * @deprecated Use the software scaler (swscale) instead.
 *)
procedure img_copy(dst: PAVPicture; src: {const} PAVPicture;
                    pix_fmt: TAVPixelFormat; width: cint; height: cint);
  cdecl; external av__codec; deprecated;

(**
 * @deprecated Use the software scaler (swscale) instead.
 *)
function img_crop(dst: PAVPicture; src: {const} PAVPicture;
           pix_fmt: TAVPixelFormat; top_band, left_band: cint): cint;
  cdecl; external av__codec; deprecated;

(**
 * @deprecated Use the software scaler (swscale) instead.
 *)
function img_pad(dst: PAVPicture; src: {const} PAVPicture; height, width: cint;
                  pix_fmt: TAVPixelFormat; padtop, padbottom, padleft, padright: cint;
                  color: PCint): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

function av_xiphlacing(s: PByte; v: cuint): cuint;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION >= 51041000} // 51.41.0
(**
 * Parses str and put in width_ptr and height_ptr the detected values.
 *
 * @return 0 in case of a successful parsing, a negative value otherwise
 * @param[in] str the string to parse: it has to be a string in the format
 * <width>x<height> or a valid video frame size abbreviation.
 * @param[in,out] width_ptr pointer to the variable which will contain the detected
 * frame width value
 * @param[in,out] height_ptr pointer to the variable which will contain the detected
 * frame height value
 *)
function av_parse_video_frame_size(width_ptr: PCint; height_ptr: PCint; str: {const} PAnsiChar): cint;
  cdecl; external av__codec;

(**
 * Parses str and put in frame_rate the detected values.
 *
 * @return 0 in case of a successful parsing, a negative value otherwise
 * @param[in] str the string to parse: it has to be a string in the format
 * <frame_rate_num>/<frame_rate_den>, a float number or a valid video rate abbreviation
 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
 * frame rate
 *)
function av_parse_video_frame_rate(frame_rate: PAVRational; str: {const} PAnsiChar): cint;
  cdecl; external av__codec;
{$IFEND}

{* error handling *}

const
{$IFDEF UNIX}
  ENOENT = ESysENOENT;
  EIO    = ESysEIO;
  ENOMEM = ESysENOMEM;
  EINVAL = ESysEINVAL;
  EDOM   = ESysEDOM;
  ENOSYS = ESysENOSYS;
  EILSEQ = ESysEILSEQ;
  EPIPE  = ESysEPIPE;
{$ELSE}
  ENOENT = 2;
  EIO    = 5;
  ENOMEM = 12;
  EINVAL = 22;
  EPIPE  = 32;  // just an assumption. needs to be checked.
  EDOM   = 33;
  {$IFDEF MSWINDOWS}
  // Note: we assume that ffmpeg was compiled with MinGW.
  // This must be changed if DLLs were compiled with cygwin.
  ENOSYS = 40;  // MSVC/MINGW: 40, CYGWIN: 88,  LINUX/FPC: 38
  EILSEQ = 42;  // MSVC/MINGW: 42, CYGWIN: 138, LINUX/FPC: 84
  {$ENDIF}
{$ENDIF}

const
{$IF EINVAL > 0}
  AVERROR_SIGN = -1;
{$ELSE}
  {* Some platforms have E* and errno already negated. *}
  AVERROR_SIGN =  1;
{$IFEND}

(*
#if EINVAL > 0
#define AVERROR(e) (-(e)) {**< Returns a negative error code from a POSIX error code, to return from library functions. *}
#define AVUNERROR(e) (-(e)) {**< Returns a POSIX error code from a library function error return value. *}
#else
{* Some platforms have E* and errno already negated. *}
#define AVERROR(e) (e)
#define AVUNERROR(e) (e)
#endif
*)

const
  AVERROR_UNKNOWN     = AVERROR_SIGN * EINVAL;  (**< unknown error *)
  AVERROR_IO          = AVERROR_SIGN * EIO;     (**< I/O error *)
  AVERROR_NUMEXPECTED = AVERROR_SIGN * EDOM;    (**< Number syntax expected in filename. *)
  AVERROR_INVALIDDATA = AVERROR_SIGN * EINVAL;  (**< invalid data found *)
  AVERROR_NOMEM       = AVERROR_SIGN * ENOMEM;  (**< not enough memory *)
  AVERROR_NOFMT       = AVERROR_SIGN * EILSEQ;  (**< unknown format *)
  AVERROR_NOTSUPP     = AVERROR_SIGN * ENOSYS;  (**< Operation not supported. *)
  AVERROR_NOENT       = AVERROR_SIGN * ENOENT;  (**< No such file or directory. *)
{$IF LIBAVCODEC_VERSION >= 52017000} // 52.17.0
  AVERROR_EOF         = AVERROR_SIGN * EPIPE;   (**< End of file. *)
{$IFEND}
  // Note: function calls as constant-initializers are invalid
  //AVERROR_PATCHWELCOME = -MKTAG('P','A','W','E'); {**< Not yet implemented in FFmpeg. Patches welcome. *}
  AVERROR_PATCHWELCOME = -(ord('P') or (ord('A') shl 8) or (ord('W') shl 16) or (ord('E') shl 24));

{$IF LIBAVCODEC_VERSION >= 52018000} // 52.18.0
(**
 * Registers the hardware accelerator hwaccel.
 *)
procedure av_register_hwaccel (hwaccel: PAVHWAccel)
  cdecl; external av__codec;

(**
 * If hwaccel is NULL, returns the first registered hardware accelerator,
 * if hwaccel is non-NULL, returns the next registered hardware accelerator
 * after hwaccel, or NULL if hwaccel is the last one.
 *)
function av_hwaccel_next (hwaccel: PAVHWAccel): PAVHWAccel;
  cdecl; external av__codec;
{$IFEND}

{$IF LIBAVCODEC_VERSION >= 52030000} // 52.30.0
(**
 * Lock operation used by lockmgr
 *)
type
  TAVLockOp = (
    AV_LOCK_CREATE,  ///< Create a mutex
    AV_LOCK_OBTAIN,  ///< Lock the mutex
    AV_LOCK_RELEASE, ///< Unlock the mutex
    AV_LOCK_DESTROY  ///< Free mutex resources
  );

(**
 * Register a user provided lock manager supporting the operations
 * specified by AVLockOp. mutex points to a (void *) where the
 * lockmgr should store/get a pointer to a user allocated mutex. It's
 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
 *
 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
 *           callback during the call to av_lockmgr_register().
 *           Thus, the application must be prepared to handle that.
 *           If cb is set to NULL the lockmgr will be unregistered.
 *           Also note that during unregistration the previously registered
 *           lockmgr callback may also be invoked.
 *)
function av_lockmgr_register(cb: function (mutex: Ppointer; op: TAVLockOp)): cint;
  cdecl; external av__codec;
{$IFEND}

implementation

{$IF (LIBAVCODEC_VERSION >= 52025000) and (LIBAVCODEC_VERSION <= 5202700)} // 52.25.0
procedure av_free_packet(pkt: PAVPacket);{$IFDEF HASINLINE} inline; {$ENDIF} 
begin
  if (pkt <> nil) then
  begin
    if (pkt.destruct <> nil) then
      pkt.destruct(pkt)
    else
    begin
      pkt.data = NULL;
      pkt.size = 0;
    end;
  end;
end;
{$IFEND}

end.