aboutsummaryrefslogblamecommitdiffstats
path: root/us_maker_edition/src/lib/ffmpeg/avformat.pas
blob: 34142125b7abfa1c90e9e73edc3a6d9537e22d37 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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















                                                                               
  




                                                                                   
  

                                                                      
                                                                       
























































                                                                                 
                                       






























































































































































































































































































































                                                                                                                                                                                                                                                         


                                                                      









































































































































































































































































                                                                                                                                


                                                                                                                            











































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                                                      
(*
 * copyright (c) 2001 Fabrice Bellard
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * 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 libavformat/avformat.h
 * Min. version: 50.5.0 , revision  6577, Sat Oct  7 15:30:46 2006 UTC
 * Max. version: 52.67.0, revision 23357, Sun May 30 21:30:00 2010 CET 
 *)

unit avformat;

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

{$I switches.inc}  (* for the HasInline define *)

{$IFDEF DARWIN}
  {$linklib libavformat}
{$ENDIF}

interface

uses
  ctypes,
  avcodec,
  avutil,
  avio,
  rational,
  SysUtils,
  UConfig;

const
  (*
   * IMPORTANT: The official FFmpeg C headers change very quickly. Often some
   * of the data structures are changed so that they become incompatible with
   * older header files. The Pascal headers have to be adjusted to those changes,
   * otherwise the application might crash randomly or strange bugs (not
   * necessarily related to video or audio due to buffer overflows etc.) might
   * occur.
   *
   * In the past users reported problems with USDX that took hours to fix and
   * the problem was an unsupported version of FFmpeg. So we decided to disable
   * support for future versions of FFmpeg until the headers are revised by us
   * for that version as they otherwise most probably will break USDX.
   *
   * If the headers do not yet support your FFmpeg version you may want to
   * adjust the max. version numbers manually but please note: it may work but
   * in many cases it does not. The USDX team does NOT PROVIDE ANY SUPPORT
   * for the game if the MAX. VERSION WAS CHANGED.
   *
   * The only safe way to support new versions of FFmpeg is to add the changes
   * of the FFmpeg git repository C headers to the Pascal headers.
   * You can accelerate this process by posting a patch with the git changes
   * translated to Pascal to our bug tracker (please join our IRC chat before
   * you start working on it). Simply adjusting the max. versions is NOT a valid
   * fix. 
   *)
  (* Max. supported version by this header *)
  LIBAVFORMAT_MAX_VERSION_MAJOR   = 52;
  LIBAVFORMAT_MAX_VERSION_MINOR   = 67;
  LIBAVFORMAT_MAX_VERSION_RELEASE = 0;
  LIBAVFORMAT_MAX_VERSION = (LIBAVFORMAT_MAX_VERSION_MAJOR * VERSION_MAJOR) +
                            (LIBAVFORMAT_MAX_VERSION_MINOR * VERSION_MINOR) +
                            (LIBAVFORMAT_MAX_VERSION_RELEASE * VERSION_RELEASE);

  (* Min. supported version by this header *)
  LIBAVFORMAT_MIN_VERSION_MAJOR   = 50;
  LIBAVFORMAT_MIN_VERSION_MINOR   = 5;
  LIBAVFORMAT_MIN_VERSION_RELEASE = 0;
  LIBAVFORMAT_MIN_VERSION = (LIBAVFORMAT_MIN_VERSION_MAJOR * VERSION_MAJOR) +
                            (LIBAVFORMAT_MIN_VERSION_MINOR * VERSION_MINOR) +
                            (LIBAVFORMAT_MIN_VERSION_RELEASE * VERSION_RELEASE);

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

(* Check if linked versions are supported *)
{$IF (LIBAVFORMAT_VERSION > LIBAVFORMAT_MAX_VERSION)}
  {$MESSAGE Error 'Linked version of libavformat is not yet supported!'}
{$IFEND}

{$IF LIBAVFORMAT_VERSION >= 52020000} // 52.20.0
(**
 * I return the LIBAVFORMAT_VERSION_INT constant.  You got
 * a fucking problem with that, douchebag?
 *)
function avformat_version(): cuint;
  cdecl; external av__format;
{$IFEND}

{$IF LIBAVFORMAT_VERSION >= 52039002} // 52.39.2
(**
 * Returns the libavformat build-time configuration.
 *)
function avformat_configuration(): {const} PansiChar;
  cdecl; external av__format;

(**
 * Returns the libavformat license.
 *)
function avformat_license(): {const} PansiChar;
  cdecl; external av__format;
{$IFEND}

type
  PAVFile = Pointer;

(*
 * Public Metadata API.
 * The metadata API allows libavformat to export metadata tags to a client
 * application using a sequence of key/value pairs. Like all strings in FFmpeg,
 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
 * Important concepts to keep in mind:
 * 1. Keys are unique; there can never be 2 tags with the same key. This is
 *    also meant semantically, i.e., a demuxer should not knowingly produce
 *    several keys that are literally different but semantically identical.
 *    E.g., key=Author5, key=Author6. In this example, all authors must be
 *    placed in the same tag.
 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
 *    want to store, e.g., the email address of the child of producer Alice
 *    and actor Bob, that could have key=alice_and_bobs_childs_email_address.
 * 3. A tag whose value is localized for a particular language is appended
 *    with a dash character ('-') and the ISO 639-2/B 3-letter language code.
 *    For example: Author-ger=Michael, Author-eng=Mike
 *    The original/default language is in the unqualified "Author" tag.
 *    A demuxer should set a default if it sets any translated tag.
 *)
const
  AV_METADATA_MATCH_CASE    = 1;
  AV_METADATA_IGNORE_SUFFIX = 2;
{$IF LIBAVFORMAT_VERSION >= 52043000} // >= 52.43.0
  AV_METADATA_DONT_STRDUP_KEY = 4;
  AV_METADATA_DONT_STRDUP_VAL = 8;
{$IFEND}
{$IF LIBAVFORMAT_VERSION >= 52061000} // >= 52.61.0
  AV_METADATA_DONT_OVERWRITE  = 16;
{$IFEND}

type
  PAVMetadataTag = ^TAVMetadataTag;
  TAVMetadataTag = record
    key:   PAnsiChar;
    value: PAnsiChar;
  end;

  PAVMetadata = Pointer;

{$IF LIBAVFORMAT_VERSION > 52024001} // > 52.24.1
{$IF LIBAVFORMAT_VERSION_MAJOR = 52}
(**
 * Gets a metadata element with matching key.
 * @param prev Set to the previous matching element to find the next.
 *             If set to NULL the first matching element is returned.
 * @param flags Allows case as well as suffix-insensitive comparisons.
 * @return Found tag or NULL, changing key or value leads to undefined behavior.
 *)
function av_metadata_get(m: PAVMetadata; key: {const} PAnsiChar;
                         prev: {const} PAVMetadataTag ; flags: cint): PAVMetadataTag;
  cdecl; external av__format;

(**
 * Sets the given tag in m, overwriting an existing tag.
 * @param key tag key to add to m (will be av_strduped)
 * @param value tag value to add to m (will be av_strduped)
 * @return >= 0 on success otherwise an error code <0
 * @deprecated Use av_metadata_set2() instead.
 *)
function av_metadata_set(var pm: PAVMetadata; key: {const} PAnsiChar; value: {const} PAnsiChar): cint;
  cdecl; external av__format;
{$IF LIBAVFORMAT_VERSION >= 52061000} // >= 52.61.0
    deprecated;
{$IFEND}
{$IFEND}

{$IF LIBAVFORMAT_VERSION >= 52043000} // >= 52.43.0
(**
 * Sets the given tag in m, overwriting an existing tag.
 * @param key tag key to add to m (will be av_strduped depending on flags)
 * @param value tag value to add to m (will be av_strduped depending on flags)
 * @return >= 0 on success otherwise an error code <0
 *)
function av_metadata_set2(var pm: PAVMetadata; key: {const} PAnsiChar; value: {const} PAnsiChar; flags: cint): cint;
  cdecl; external av__format;
{$IFEND}

(**
 * Frees all the memory allocated for an AVMetadata struct.
 *)
procedure av_metadata_free(var m: PAVMetadata);
  cdecl; external av__format;
{$IFEND}

(* packet functions *)

{$IF LIBAVFORMAT_VERSION < 52032000} // < 52.32.0
type
  PAVPacket = ^TAVPacket;
  TAVPacket = record
    (**
     * Presentation timestamp in 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 can not 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 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 time_base units, 0 if unknown.
     * Equals next_pts - this_pts in presentation order.
     *)
    duration: cint;
    destruct: procedure (p: PAVPacket); cdecl;
    priv: pointer;
    pos: cint64;                            ///< byte position in stream, -1 if unknown

    {$IF LIBAVFORMAT_VERSION >= 52022000} // 52.22.0
    (**
     * Time difference in stream time base units from the pts of this
     * packet to the point at which the output from the decoder has converged
     * independent from the availability of previous frames. That is, the
     * frames are virtually identical no matter if decoding started from
     * the very first frame or from this keyframe.
     * Is AV_NOPTS_VALUE if unknown.
     * This field is not the display duration of the current packet.
     *
     * The purpose of this field is to allow seeking in streams that have no
     * keyframes in the conventional sense. It corresponds to the
     * recovery point SEI in H.264 and match_time_delta in NUT. It is also
     * essential for some types of subtitle streams to ensure that all
     * subtitles are correctly displayed after seeking.
     *)
    convergence_duration: cint64;
    {$IFEND}
  end;
  
const
  PKT_FLAG_KEY = $0001;

procedure av_destruct_packet_nofree(var pkt: TAVPacket);
  cdecl; external av__format;

(**
 * Default packet destructor.
 *)
procedure av_destruct_packet(var pkt: TAVPacket);
  cdecl; external av__format;

(**
 * Initialize optional fields of a packet with default values.
 *
 * @param pkt packet
 *)
procedure av_init_packet(var pkt: TAVPacket);
{$IF LIBAVFORMAT_VERSION >= 51012002} // 51.12.2
  cdecl; external av__format;
{$IFEND}

(**
 * 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(var pkt: TAVPacket; size: cint): cint;
  cdecl; external av__format;
{$IFEND}

(**
 * Allocate and read the payload of a packet and initialize its fields with
 * default values.
 *
 * @param pkt packet
 * @param size desired payload size
 * @return >0 (read size) if OK, AVERROR_xxx otherwise
 *)
function av_get_packet(s: PByteIOContext; var pkt: TAVPacket; size: cint): cint;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION < 52032000} // < 52.32.0
(**
 * @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__format;

(**
 * Free a packet.
 *
 * @param pkt packet to free
 *)
procedure av_free_packet(pkt: PAVPacket); {$IFDEF HasInline}inline;{$ENDIF}
{$IFEND}

(*************************************************)
(* fractional numbers for exact pts handling *)

type
 (**
  * The exact value of the fractional number is: 'val + num / den'.
  * num is assumed to be 0 <= num < den.
  *)
  PAVFrac = ^TAVFrac;
  TAVFrac = record
    val, num, den: cint64;
  end;

(*************************************************)
(* input/output formats *)

type
  (** This structure contains the data a format has to probe a file. *)
  TAVProbeData = record
    filename: PAnsiChar;
    buf: PByteArray;  (**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. *)
    buf_size: cint;   (**< Size of buf except extra allocated bytes *)
  end;

const
  AVPROBE_SCORE_MAX   = 100;   ///< Maximum score, half of that is used for file-extension-based detection
  AVPROBE_PADDING_SIZE = 32;   ///< extra allocated bytes at the end of the probe buffer

  //! Demuxer will use url_fopen, no opened file should be provided by the caller.
  AVFMT_NOFILE        = $0001;
  AVFMT_NEEDNUMBER    = $0002; (**< Needs '%d' in filename. *)
  AVFMT_SHOW_IDS      = $0008; (**< Show format stream IDs numbers. *)
  AVFMT_RAWPICTURE    = $0020; (**< Format wants AVPicture structure for
                                      raw picture data. *)
  AVFMT_GLOBALHEADER  = $0040; (**< Format wants global header. *)
  AVFMT_NOTIMESTAMPS  = $0080; (**< Format does not need / have any timestamps. *)
  AVFMT_GENERIC_INDEX = $0100; (**< Use generic index building code. *)
  AVFMT_TS_DISCONT    = $0200; (**< Format allows timestamp discontinuities. *)
  {$IF LIBAVFORMAT_VERSION >= 52029002} // 52.29.2
  AVFMT_VARIABLE_FPS  = $0400; (**< Format allows variable fps. *)
  {$IFEND}
  {$IF LIBAVFORMAT_VERSION >= 52052000} // 52.52.0
  AVFMT_NODIMENSIONS  = $0800; (**< Format does not need width/height *)
  {$IFEND}

  // used by AVIndexEntry
  AVINDEX_KEYFRAME = $0001;

  AVFMTCTX_NOHEADER = $0001; (**< signal that no header is present
                                         (streams are added dynamically) *)
{$IF LIBAVFORMAT_VERSION_MAJOR < 53}
  MAX_STREAMS = 20;
{$ELSE}
  MAX_STREAMS = 100;
{$IFEND}

  AVFMT_NOOUTPUTLOOP = -1;
  AVFMT_INFINITEOUTPUTLOOP = 0;
  AVFMT_FLAG_GENPTS = $0001;   ///< Generate missing pts even if it requires parsing future frames.
  AVFMT_FLAG_IGNIDX = $0002;   ///< Ignore index.
  AVFMT_FLAG_NONBLOCK = $0004; ///< Do not block when reading packets from input.
{$IF LIBAVFORMAT_VERSION >= 52048000}  // >= 52.48.0
  AVFMT_FLAG_IGNDTS   = $0008; ///< Ignore DTS on frames that contain both DTS & PTS
{$IFEND}
{$IF LIBAVFORMAT_VERSION >= 52060000}  // >= 52.60.0
  AVFMT_FLAG_NOFILLIN = $0010; ///< Do not infer any values from other values, just return what is stored in the container
  AVFMT_FLAG_NOPARSE  = $0020; ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
{$IFEND}
{$IF LIBAVFORMAT_VERSION >= 52063000}  // >= 52.63.0
  AVFMT_FLAG_RTP_HINT = $0040; ///< Add RTP hinting to the output file
{$IFEND}

  // used by AVStream
  MAX_REORDER_DELAY = 16;

  // used by TAVProgram
  AV_PROGRAM_RUNNING = 1;


  AV_DISPOSITION_DEFAULT   = $0001;
  AV_DISPOSITION_DUB       = $0002;
  AV_DISPOSITION_ORIGINAL  = $0004;
  AV_DISPOSITION_COMMENT   = $0008;
  AV_DISPOSITION_LYRICS    = $0010;
  AV_DISPOSITION_KARAOKE   = $0020;

  // used by TAVFormatContext.debug
  FF_FDEBUG_TS = 0001;

  {$IF LIBAVFORMAT_VERSION >= 52034000}  // >= 52.34.0
    {$IF LIBAVFORMAT_VERSION < 52039000} // <  52.39.0
  MAX_PROBE_PACKETS = 100;
    {$ELSE}
  MAX_PROBE_PACKETS = 2500;
    {$IFEND}
  {$IFEND}

  {$IF LIBAVFORMAT_VERSION >= 52035000}  // >= 52.35.0
    {$IF LIBAVFORMAT_VERSION < 52039000} // <  52.39.0
  RAW_PACKET_BUFFER_SIZE = 32000;
    {$ELSE}
  RAW_PACKET_BUFFER_SIZE = 2500000;
    {$IFEND}
  {$IFEND}

type
  PPAVCodecTag = ^PAVCodecTag;
  PAVCodecTag = Pointer;

  PPAVFormatContext = ^PAVFormatContext;
  PAVFormatContext = ^TAVFormatContext;

  PAVFormatParameters = ^TAVFormatParameters;

  PAVOutputFormat = ^TAVOutputFormat;
  PAVProbeData = ^TAVProbeData;

  PAVInputFormat = ^TAVInputFormat;
  PAVIndexEntry = ^TAVIndexEntry;

  PAVStream = ^TAVStream;
  PAVPacketList = ^TAVPacketList;

  PPAVProgram = ^PAVProgram;
  PAVProgram = ^TAVProgram;

  {$IF LIBAVFORMAT_VERSION < 51006000} // 51.6.0
  PAVImageFormat = ^TAVImageFormat;
  PAVImageInfo = ^TAVImageInfo;
  {$IFEND}

{$IF LIBAVFORMAT_VERSION >= 52030001} // >= 52.30.1
(**
 * Convert all the metadata sets from ctx according to the source and
 * destination conversion tables.
 * @param d_conv destination tags format conversion table
 * @param s_conv source tags format conversion table
 *)
  PAVMetadataConv = ^TAVMetadataConv;
  TAVMetadataConv = record
    ctx:            PAVFormatContext;
    d_conv: {const} PAVMetadataConv;
    s_conv: {const} PAVMetadataConv;
  end;
{$IFEND}

  PAVChapter = ^TAVChapter;
  TAVChapter = record
    id: cint;                 ///< unique ID to identify the chapter
    time_base: TAVRational;   ///< time base in which the start/end timestamps are specified
    start, end_: cint64;      ///< chapter start/end time in time_base units
    {$IF LIBAVFORMAT_VERSION < 53000000}  // 53.00.0
    title: PAnsiChar;         ///< chapter title
    {$IFEND}
    {$IF LIBAVFORMAT_VERSION >= 52024001} // 52.24.1
    metadata: PAVMetadata;
    {$IFEND}
  end;
  TAVChapterArray = array[0..(MaxInt div SizeOf(TAVChapter))-1] of TAVChapter;
  PAVChapterArray = ^TAVChapterArray;

  TAVFormatParameters = record
    time_base: TAVRational;
    sample_rate: cint;
    channels: cint;
    width: cint;
    height: cint;
    pix_fmt: TAVPixelFormat;
    {$IF LIBAVFORMAT_VERSION < 51006000} // 51.6.0
    image_format: PAVImageFormat;
    {$IFEND}
    channel: cint; (**< Used to select DV channel. *)
    {$IF LIBAVFORMAT_VERSION_MAJOR < 52}
    device: PAnsiChar; (* video, audio or DV device, if LIBAVFORMAT_VERSION_INT < (52<<16) *)
    {$IFEND}
    standard: PAnsiChar; (**< TV standard, NTSC, PAL, SECAM *)
    { Delphi does not support bit fields -> use bf_flags instead
    unsigned int mpeg2ts_raw:1;  (**< Force raw MPEG-2 transport stream output, if possible. *)
    unsigned int mpeg2ts_compute_pcr:1; (**< Compute exact PCR for each transport
                                  stream packet (only meaningful if
                                  mpeg2ts_raw is TRUE). *)
    unsigned int initial_pause:1;       (**< Do not begin to play the stream
                                        immediately (RTSP only). *)
    unsigned int prealloced_context:1;
    }
    bf_flags: byte; // 0:mpeg2ts_raw/1:mpeg2ts_compute_pcr/2:initial_pause/3:prealloced_context
    {$IF LIBAVFORMAT_VERSION_MAJOR < 53}
    video_codec_id: TCodecID;
    audio_codec_id: TCodecID;
    {$IFEND}
  end;

  TAVOutputFormat = record
    name: PAnsiChar;
    (**
     * Descriptive name for the format, meant to be more human-readable
     * than name. You should use the NULL_IF_CONFIG_SMALL() macro
     * to define it.
     *)
    long_name: PAnsiChar;
    mime_type: PAnsiChar;
    extensions: PAnsiChar; (**< comma-separated filename extensions *)
    (** size of private data so that it can be allocated in the wrapper *)
    priv_data_size: cint;
    (* output support *)
    audio_codec: TCodecID; (**< default audio codec *)
    video_codec: TCodecID; (**< default video codec *)
    write_header: function (c: PAVFormatContext): cint; cdecl;
    write_packet: function (c: PAVFormatContext; pkt: PAVPacket): cint; cdecl;
    write_trailer: function (c: PAVFormatContext): cint; cdecl;
    (** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER *)
    flags: cint;
    (** Currently only used to set pixel format if not YUV420P. *)
    set_parameters: function (c: PAVFormatContext; f: PAVFormatParameters): cint; cdecl;
    interleave_packet: function (s: PAVFormatContext; out_: PAVPacket;
                                 in_: PAVPacket; flush: cint): cint; cdecl;

    {$IF LIBAVFORMAT_VERSION >= 51008000} // 51.8.0
    (**
     * List of supported codec_id-codec_tag pairs, ordered by "better
     * choice first". The arrays are all terminated by CODEC_ID_NONE.
     *)
    codec_tag: {const} PPAVCodecTag;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 51012002} // 51.12.2
    subtitle_codec: TCodecID; (**< default subtitle codec *)
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52030001} // 52.30.1
    {const} metadata_conv: PAVMetadataConv;
    {$IFEND}

    (* private fields *)
    next: PAVOutputFormat;
  end;

  TAVInputFormat = record
    name: PAnsiChar;
    (**
     * Descriptive name for the format, meant to be more human-readable
     * than name. You should use the NULL_IF_CONFIG_SMALL() macro
     * to define it.
     *)
    long_name: PAnsiChar;
    (** Size of private data so that it can be allocated in the wrapper. *)
    priv_data_size: cint;
    (**
     * Tell if a given file has a chance of being parsed as this format.
     * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
     * big so you do not have to check for that unless you need more.
     *)
    read_probe: function (p: PAVProbeData): cint; cdecl;
    (** Read the format header and initialize the AVFormatContext
       structure. Return 0 if OK. 'ap' if non-NULL contains
       additional parameters. Only used in raw format right
       now. 'av_new_stream' should be called to create new streams.  *)
    read_header: function (c: PAVFormatContext; ap: PAVFormatParameters): cint; cdecl;
    (** Read one packet and put it in 'pkt'. pts and flags are also
       set. 'av_new_stream' can be called only if the flag
       AVFMTCTX_NOHEADER is used.
       @return 0 on success, < 0 on error.
               When returning an error, pkt must not have been allocated
               or must be freed before returning *)
    read_packet: function (c: PAVFormatContext; var pkt: TAVPacket): cint; cdecl;
    (** Close the stream. The AVFormatContext and AVStreams are not
       freed by this function *)
    read_close: function (c: PAVFormatContext): cint; cdecl;

{$IF LIBAVFORMAT_VERSION_MAJOR < 53}
    (**
     * Seek to a given timestamp relative to the frames in
     * stream component stream_index.
     * @param stream_index Must not be -1.
     * @param flags Selects which direction should be preferred if no exact
     *              match is available.
     * @return >= 0 on success (but not necessarily the new offset)
     *)
    read_seek: function (c: PAVFormatContext; stream_index: cint;
                  timestamp: cint64; flags: cint): cint; cdecl;
{$IFEND}

    (**
     * Gets the next timestamp in stream[stream_index].time_base units.
     * @return the timestamp or AV_NOPTS_VALUE if an error occurred
     *)
    read_timestamp: function (s: PAVFormatContext; stream_index: cint;
                              pos: pint64; pos_limit: cint64): cint64; cdecl;
    (** Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER. *)
    flags: cint;
    (** If extensions are defined, then no probe is done. You should
       usually not use extension format guessing because it is not
       reliable enough *)
    extensions: PAnsiChar;
    (** General purpose read-only value that the format can use. *)
    value: cint;

    (** Starts/resumes playing - only meaningful if using a network-based format
       (RTSP). *)
    read_play: function (c: PAVFormatContext): cint; cdecl;

    (** Pauses playing - only meaningful if using a network-based format
      (RTSP). *)  
    read_pause: function (c: PAVFormatContext): cint; cdecl;

    {$IF LIBAVFORMAT_VERSION >= 51008000} // 51.8.0
    codec_tag: {const} PPAVCodecTag;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52030000} // 52.30.0
    (**
     * Seeks to timestamp ts.
     * Seeking will be done so that the point from which all active streams
     * can be presented successfully will be closest to ts and within min/max_ts.
     * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
     *)
    read_seek2: function (s:            PAVFormatContext;
                          stream_index: cint;
			  min_ts:       cint64;
			  ts:           cint64; 
			  max_ts:       cint64;
			  flags:        cint): cint; cdecl;
    {$IFEND}
    
    {$IF LIBAVFORMAT_VERSION >= 52030001} // 52.30.1
    {const} metadata_conv: PAVMetadataConv;
    {$IFEND}

    (* private fields *)
    next: PAVInputFormat;
  end;

  TAVStreamParseType = (
    AVSTREAM_PARSE_NONE,
    AVSTREAM_PARSE_FULL,       (**< full parsing and repack *)
    AVSTREAM_PARSE_HEADERS,    (**< Only parse headers, do not repack. *)
    AVSTREAM_PARSE_TIMESTAMPS  (**< full parsing and interpolation of timestamps for frames not starting on a packet boundary *)
    {$IF LIBAVFORMAT_VERSION >= 52066000} // 52.66.0
  , AVSTREAM_PARSE_FULL_ONCE   (**< full parsing and repack of the first frame only, only implemented for H.264 currently *)
    {$IFEND}
  );

  TAVIndexEntry = record
    pos: cint64;
    timestamp: cint64;
    { Delphi doesn't support bitfields -> use flags_size instead
    int flags:2;
    int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
    }
    flags_size: cint; // 0..1: flags, 2..31: size
    min_distance: cint;         (**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. *)
  end;

 (**
  * Stream 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(AVStream) must not be used outside libav*.
  *)
  TAVStream = record
    index: cint;    (**< stream index in AVFormatContext *)
    id: cint;       (**< format-specific stream ID *)
    codec: PAVCodecContext; (**< codec context *)
    (**
     * Real base framerate of the stream.
     * This is the lowest framerate with which all timestamps can be
     * represented accurately (it is the least common multiple of all
     * framerates in the stream). Note, this value is just a guess!
     * For example, if the time base is 1/90000 and all frames have either
     * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
     *)
    r_frame_rate: TAVRational;
    priv_data: pointer;

    (* internal data used in av_find_stream_info() *)
    first_dts: cint64;
    {$IF LIBAVFORMAT_VERSION_MAJOR < 52}
    codec_info_nb_frames: cint;
    {$IFEND}

    (** encoding: pts generation when outputting stream *)
    pts: TAVFrac;
    (**
     * This is the fundamental unit of time (in seconds) in terms
     * of which frame timestamps are represented. For fixed-fps content,
     * time base should be 1/framerate and timestamp increments should be 1.
     *)
    time_base: TAVRational;
    pts_wrap_bits: cint; (* number of bits in pts (used for wrapping control) *)
    (* ffmpeg.c private use *)
    stream_copy: cint; (**< If set, just copy stream. *)
    discard: TAVDiscard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
    //FIXME move stuff to a flags field?
    (** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
     * MN:dunno if thats the right place, for it *)
    quality: cfloat;
    (**
     * Decoding: pts of the first frame of the stream, in stream time base.
     * Only set this if you are absolutely 100% sure that the value you set
     * it to really is the pts of the first frame.
     * This may be undefined (AV_NOPTS_VALUE).
     * @note The ASF header does NOT contain a correct start_time the ASF
     * demuxer must NOT set this.
     *)
    start_time: cint64;
    (**
     * Decoding: duration of the stream, in stream time base.
     * If a source file does not specify a duration, but does specify
     * a bitrate, this value will be estimated from bitrate and file size.
     *)
    duration: cint64;

    {$IF LIBAVFORMAT_VERSION_MAJOR < 53}
    language: array [0..3] of PAnsiChar; (* ISO 639-2/B 3-letter language code (empty string if undefined) *)
    {$IFEND}

    (* av_read_frame() support *)
    need_parsing: TAVStreamParseType;
    parser: PAVCodecParserContext;

    cur_dts: cint64;
    last_IP_duration: cint;
    last_IP_pts: cint64;
    (* av_seek_frame() support *)
    index_entries: PAVIndexEntry; (**< Only used if the format does not
                                       support seeking natively. *)
    nb_index_entries: cint;
    index_entries_allocated_size: cuint;

    nb_frames: cint64;                 ///< number of frames in this stream if known or 0
    
    {$IF (LIBAVFORMAT_VERSION >= 50006000) and (LIBAVFORMAT_VERSION_MAJOR < 53)} // 50.6.0 - 53.0.0
    unused: array [0..4] of cint64;
    {$IFEND}

    {$IF (LIBAVFORMAT_VERSION >= 52006000) and (LIBAVFORMAT_VERSION_MAJOR < 53)} // 52.6.0 - 53.0.0
    filename: PAnsiChar; (**< source filename of the stream *)
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52008000} // 52.8.0
    disposition: cint; (**< AV_DISPOSITION_* bitfield *)
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52019000} // 52.19.0
    probe_data: TAVProbeData;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52021000} // 52.21.0
    pts_buffer: array [0..MAX_REORDER_DELAY] of cint64;

    (**
     * sample aspect ratio (0 if unknown)
     * - encoding: Set by user.
     * - decoding: Set by libavformat.
     *)
    sample_aspect_ratio: TAVRational;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52024001} // 52.24.1
    metadata: PAVMetadata;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION > 52024001} // > 52.24.1
    {* av_read_frame() support *}
    cur_ptr: {const} PCuint8;
    cur_len: cint;
    cur_pkt: TAVPacket;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52030000} // > 52.30.0
    // Timestamp generation support:
    (**
     * Timestamp corresponding to the last dts sync point.
     *
     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
     * a DTS is received from the underlying container. Otherwise set to
     * AV_NOPTS_VALUE by default.
     *)
    reference_dts: cint64;
    {$IFEND}
    {$IF LIBAVFORMAT_VERSION >= 52034000} // >= 52.34.0
    (**
     * Number of packets to buffer for codec probing
     * NOT PART OF PUBLIC API
     *)
    probe_packets: cint;
    {$IFEND}
    {$IF LIBAVFORMAT_VERSION >= 52038000} // >= 52.38.0
    (**
     * last packet in packet_buffer for this stream when muxing.
     * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
     *)
    last_in_packet_buffer: PAVPacketList;
    {$IFEND}
    {$IF LIBAVFORMAT_VERSION >= 52041000} // >= 52.41.0
    (**
     * Average framerate
     *)
    avg_frame_rate: TAVRational;
    {$IFEND}
    {$IF LIBAVFORMAT_VERSION >= 52054000} // >= 52.54.0
    (**
     * Number of frames that have been demuxed during av_find_stream_info()
     *)
    codec_info_nb_frames: cint;
    {$IFEND}
  end;

 (**
  * Format I/O context.
  * 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(AVFormatContext) must not be used outside libav*.
  *)
  TAVFormatContext = record
    av_class: PAVClass; (**< Set by avformat_alloc_context. *)
    (* Can only be iformat or oformat, not both at the same time. *)
    iformat: PAVInputFormat;
    oformat: PAVOutputFormat;
    priv_data: pointer;

    {$IF LIBAVFORMAT_VERSION_MAJOR >= 52}
    pb: PByteIOContext;
    {$ELSE}
    pb: TByteIOContext;
    {$IFEND}

    nb_streams: cuint;
    streams: array [0..MAX_STREAMS - 1] of PAVStream;
    filename: array [0..1023] of AnsiChar; (* input or output filename *)
    (* stream info *)
    timestamp: cint64;
    {$IF LIBAVFORMAT_VERSION < 53000000} // 53.00.0
    title: array [0..511] of AnsiChar;
    author: array [0..511] of AnsiChar;
    copyright: array [0..511] of AnsiChar;
    comment: array [0..511] of AnsiChar;
    album: array [0..511] of AnsiChar;
    year: cint;  (**< ID3 year, 0 if none *)
    track: cint; (**< track number, 0 if none *)
    genre: array [0..31] of AnsiChar; (**< ID3 genre *)
    {$IFEND}

    ctx_flags: cint; (**< Format-specific flags, see AVFMTCTX_xx *)
    (* private data for pts handling (do not modify directly). *)
    (** This buffer is only needed when packets were already buffered but
       not decoded, for example to get the codec parameters in MPEG
       streams. *)
    packet_buffer: PAVPacketList;

    (** Decoding: position of the first frame of the component, in
       AV_TIME_BASE fractional seconds. NEVER set this value directly:
       It is deduced from the AVStream values. *)
    start_time: cint64;
    (** Decoding: duration of the stream, in AV_TIME_BASE fractional
        seconds. Only set this value if you know none of the individual stream
        durations and also dont set any of them. This is deduced from the
        AVStream values if not set.  *)
    duration: cint64;
    (** decoding: total file size, 0 if unknown *)
    file_size: cint64;
    (** Decoding: total stream bitrate in bit/s, 0 if not
       available. Never set it directly if the file_size and the
       duration are known as ffmpeg can compute it automatically. *)
    bit_rate: cint;

    (* av_read_frame() support *)
    cur_st: PAVStream;
    {$IF LIBAVFORMAT_VERSION_MAJOR < 53}
    cur_ptr_deprecated: pbyte;
    cur_len_deprecated: cint;
    cur_pkt_deprecated: TAVPacket;
    {$IFEND}

    (* av_seek_frame() support *)
    data_offset: cint64; (* offset of the first packet *)
    index_built: cint;

    mux_rate: cint;
    {$IF LIBAVFORMAT_VERSION < 52034001} // < 52.34.1
    packet_size: cint;
    {$ELSE}
    packet_size: cuint;
    {$IFEND}
    preload: cint;
    max_delay: cint;

    (* number of times to loop output in formats that support it *)
    loop_output: cint;

    flags: cint;
    loop_input: cint;

    {$IF LIBAVFORMAT_VERSION >= 50006000} // 50.6.0
    (** decoding: size of data to probe; encoding: unused. *)
    probesize: cuint;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 51009000} // 51.9.0
    (**
     * Maximum time (in AV_TIME_BASE units) during which the input should
     * be analyzed in av_find_stream_info().
     *)
    max_analyze_duration: cint;

    key: pbyte;
    keylen : cint;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 51014000} // 51.14.0
    nb_programs: cuint;
    programs: PPAVProgram;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52003000} // 52.3.0
    (**
     * Forced video codec_id.
     * Demuxing: Set by user.
     *)
    video_codec_id: TCodecID;
    (**
     * Forced audio codec_id.
     * Demuxing: Set by user.
     *)
    audio_codec_id: TCodecID;
    (**
     * Forced subtitle codec_id.
     * Demuxing: Set by user.
     *)
    subtitle_codec_id: TCodecID;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
    (**
     * Maximum amount of memory in bytes to use for the index of each stream.
     * If the index exceeds this size, entries will be discarded as
     * needed to maintain a smaller size. This can lead to slower or less
     * accurate seeking (depends on demuxer).
     * Demuxers for which a full in-memory index is mandatory will ignore
     * this.
     * muxing  : unused
     * demuxing: set by user
     *)
    max_index_size: cuint;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52009000} // 52.9.0
    (**
     * Maximum amount of memory in bytes to use for buffering frames
     * obtained from realtime capture devices.
     *)
    max_picture_buffer: cuint;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52014000} // 52.14.0
    nb_chapters: cuint;
    chapters: PAVChapterArray;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52016000} // 52.16.0
    (**
     * Flags to enable debugging.
     *)
    debug: cint;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52019000} // 52.19.0
    (**
     * Raw packets from the demuxer, prior to parsing and decoding.
     * This buffer is used for buffering packets until the codec can
     * be identified, as parsing cannot be done without knowing the
     * codec.
     *)
    raw_packet_buffer: PAVPacketList;
    raw_packet_buffer_end: PAVPacketList;

    packet_buffer_end: PAVPacketList;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52024001} // 52.24.1
    metadata: PAVMetadata;
    {$IFEND}
    
    {$IF LIBAVFORMAT_VERSION >= 52035000} // 52.35.0
    (**
     * Remaining size available for raw_packet_buffer, in bytes.
     * NOT PART OF PUBLIC API
     *)
    raw_packet_buffer_remaining_size: cint;
    {$IFEND}

    {$IF LIBAVFORMAT_VERSION >= 52056000} // 52.56.0
    (**
     * Start time of the stream in real world time, in microseconds
     * since the unix epoch (00:00 1st January 1970). That is, pts=0
     * in the stream was captured at this real world time.
     * - encoding: Set by user.
     * - decoding: Unused.
     *)
    start_time_realtime: cint64;
    {$IFEND}

  end;

  (**
   * 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(AVProgram) must not be used outside libav*.
   *)
  TAVProgram = record
      id                : cint;
      {$IF LIBAVFORMAT_VERSION < 53000000} // 53.00.0
      provider_name     : PAnsiChar;  ///< network name for DVB streams
      name              : PAnsiChar;  ///< service name for DVB streams
      {$IFEND}
      flags             : cint;
      discard           : TAVDiscard; ///< selects which program to discard and which to feed to the caller
      {$IF LIBAVFORMAT_VERSION >= 51016000} // 51.16.0
      stream_index      : PCardinal;
      nb_stream_indexes : PCardinal;
      {$IFEND}
      {$IF LIBAVFORMAT_VERSION >= 52024001} // 52.24.1
      metadata: PAVMetadata;
      {$IFEND}
  end;

  TAVPacketList = record
    pkt: TAVPacket;
    next: PAVPacketList;
  end;

{$IF LIBAVFORMAT_VERSION < 51006000} // 51.6.0
  (* still image support *)
  PAVInputImageContext = pointer; {deprecated}

  (* still image support *)
  TAVImageInfo = record
    pix_fmt: TAVPixelFormat; (* requested pixel format *)
    width: cint; (* requested width *)
    height: cint; (* requested height *)
    interleaved: cint; (* image is interleaved (e.g. interleaved GIF) *)
    pict: TAVPicture; (* returned allocated image *)
  end; {deprecated}

  TAVImageFormat = record
    name: PAnsiChar;
    extensions: PAnsiChar;
    (* tell if a given file has a chance of being parsing by this format *)
    img_probe: function (d: PAVProbeData): cint; cdecl;
    (* read a whole image. 'alloc_cb' is called when the image size is
       known so that the caller can allocate the image. If 'allo_cb'
       returns non zero, then the parsing is aborted. Return '0' if
       OK. *)
    img_read: function (b: PByteIOContext; alloc_cb: pointer; ptr: pointer): cint; cdecl;
    (* write the image *)
    supported_pixel_formats: cint; (* mask of supported formats for output *)
    img_write: function (b: PByteIOContext; i: PAVImageInfo): cint; cdecl;
    flags: cint;
    next: PAVImageFormat;
  end; {deprecated}

procedure av_register_image_format(img_fmt: PAVImageFormat);
    cdecl; external av__format; deprecated;

function av_probe_image_format(pd: PAVProbeData): PAVImageFormat;
    cdecl; external av__format; deprecated;

function guess_image_format(filename: PAnsiChar): PAVImageFormat;
    cdecl; external av__format; deprecated;

function av_read_image(pb: PByteIOContext; filename: PAnsiChar;
                  fmt: PAVImageFormat;
                  alloc_cb: pointer; opaque: pointer): cint;
    cdecl; external av__format; deprecated;

function av_write_image(pb: PByteIOContext; fmt: PAVImageFormat; img: PAVImageInfo): cint;
    cdecl; external av__format; deprecated;
{$IFEND}

{$IF LIBAVFORMAT_VERSION_MAJOR < 53}
{
var
  first_iformat: PAVInputFormat; external av__format;
  first_oformat: PAVOutputFormat; external av__format;
}
{$IFEND}

{$IF LIBAVFORMAT_VERSION >= 52003000} // 52.3.0
(**
 * If f is NULL, returns the first registered input format,
 * if f is non-NULL, returns the next registered input format after f
 * or NULL if f is the last one.
 *)
function av_iformat_next(f: PAVInputFormat): PAVInputFormat;
    cdecl; external av__format;
(**
 * If f is NULL, returns the first registered output format,
 * if f is non-NULL, returns the next registered input format after f
 * or NULL if f is the last one.
 *)
function av_oformat_next(f: PAVOutputFormat): PAVOutputFormat;
    cdecl; external av__format;
{$IFEND}

function av_guess_image2_codec(filename: {const} PAnsiChar): TCodecID;
    cdecl; external av__format;

(* XXX: Use automatic init with either ELF sections or C file parser *)
(* modules. *)

(* utils.c *)
procedure av_register_input_format(format: PAVInputFormat);
  cdecl; external av__format;

procedure av_register_output_format(format: PAVOutputFormat);
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION_MAJOR < 53} // < 53
function guess_stream_format(short_name: PAnsiChar;
                             filename: PAnsiChar;
                             mime_type: PAnsiChar): PAVOutputFormat;
  cdecl; external av__format; deprecated;
{$IFEND}

(**
 * Returns the output format in the list of registered output formats
 * which best matches the provided parameters, or returns NULL if
 * there is no match.
 *
 * @param short_name if non-NULL checks if short_name matches with the
 * names of the registered formats
 * @param filename if non-NULL checks if filename terminates with the
 * extensions of the registered formats
 * @param mime_type if non-NULL checks if mime_type matches with the
 * MIME type of the registered formats
 *)
(**
 * @deprecated Use av_guess_format() instead.
 *)
function guess_format(short_name: PAnsiChar;
                      filename: PAnsiChar;
                      mime_type: PAnsiChar): PAVOutputFormat;
  cdecl; external av__format;
{$IF LIBAVFORMAT_VERSION >= 52045000} // >= 52.45.0
                              deprecated;
function av_guess_format(short_name: PAnsiChar;
                         filename: PAnsiChar;
                         mime_type: PAnsiChar): PAVOutputFormat;
  cdecl; external av__format;
{$IFEND}

(**
 * Guesses the codec ID based upon muxer and filename.
 *)
function av_guess_codec(fmt: PAVOutputFormat; short_name: PAnsiChar;
                        filename: PAnsiChar; mime_type: PAnsiChar;
                        type_: TCodecType): TCodecID;
  cdecl; external av__format;

(**
 * Sends a nice hexadecimal dump of a buffer to the specified file stream.
 *
 * @param f The file stream pointer where the dump should be sent to.
 * @param buf buffer
 * @param size buffer size
 *
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
 *)
procedure av_hex_dump(f: PAVFile; buf: PByteArray; size: cint);
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 51011000} // 51.11.0
(**
 * Sends a nice hexadecimal dump of a buffer to the log.
 *
 * @param avcl A pointer to an arbitrary struct of which the first field is a
 * pointer to an AVClass struct.
 * @param level The importance level of the message, lower values signifying
 * higher importance.
 * @param buf buffer
 * @param size buffer size
 *
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
 *)
procedure av_hex_dump_log(avcl: Pointer; level: cint; buf: PByteArray; size: cint);
  cdecl; external av__format;
{$IFEND}

(**
 * Sends a nice dump of a packet to the specified file stream.
 *
 * @param f The file stream pointer where the dump should be sent to.
 * @param pkt packet to dump
 * @param dump_payload True if the payload must be displayed, too.
 *)
procedure av_pkt_dump(f: PAVFile; pkt: PAVPacket; dump_payload: cint);
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 51011000} // 51.11.0
(**
 * Sends a nice dump of a packet to the log.
 *
 * @param avcl A pointer to an arbitrary struct of which the first field is a
 * pointer to an AVClass struct.
 * @param level The importance level of the message, lower values signifying
 * higher importance.
 * @param pkt packet to dump
 * @param dump_payload True if the payload must be displayed, too.
 *)
procedure av_pkt_dump_log(avcl: Pointer; level: cint; pkt: PAVPacket; dump_payload: cint);
  cdecl; external av__format;
{$IFEND}

(**
 * Initializes libavformat and registers all the muxers, demuxers and
 * protocols. If you do not call this function, then you can select
 * exactly which formats you want to support.
 *
 * @see av_register_input_format()
 * @see av_register_output_format()
 * @see av_register_protocol()
 *)
procedure av_register_all();
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 51008000} // 51.8.0
(**
 * Gets the CodecID for the given codec tag tag.
 * If no codec id is found returns CODEC_ID_NONE.
 *
 * @param tags list of supported codec_id-codec_tag pairs, as stored
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
 *)
function av_codec_get_id(var tags: PAVCodecTag; tag: cuint): TCodecID;
  cdecl; external av__format;

(**
 * Gets the codec tag for the given codec id id.
 * If no codec tag is found returns 0.
 *
 * @param tags list of supported codec_id-codec_tag pairs, as stored
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
 *)
function av_codec_get_tag(var tags: PAVCodecTag; id: TCodecID): cuint;
  cdecl; external av__format;
{$IFEND}

(* media file input *)

(**
 * Finds AVInputFormat based on the short name of the input format.
 *)
function av_find_input_format(short_name: PAnsiChar): PAVInputFormat;
  cdecl; external av__format;

(**
 * Guesses file format.
 *
 * @param is_opened Whether the file is already opened; determines whether
 *                  demuxers with or without AVFMT_NOFILE are probed.
 *)
function av_probe_input_format(pd: PAVProbeData; is_opened: cint): PAVInputFormat;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 52062000} // 52.62.0
(**
 * Guesses the file format.
 *
 * @param is_opened Whether the file is already opened; determines whether
 *                  demuxers with or without AVFMT_NOFILE are probed.
 * @param score_max A probe score larger that this is required to accept a
 *                  detection, the variable is set to the actual detection
 *                  score afterwards.
 *                  If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
 *                  to retry with a larger probe buffer.
 *)
function av_probe_input_format2(pd: PAVProbeData; is_opened: cint; score_max: PCint): PAVInputFormat;
  cdecl; external av__format;
{$IFEND}

(**
 * Allocates all the structures needed to read an input stream.
 *        This does not open the needed codecs for decoding the stream[s].
 *)
function av_open_input_stream(var ic_ptr: PAVFormatContext;
                       pb: PByteIOContext; filename: PAnsiChar;
                       fmt: PAVInputFormat; ap: PAVFormatParameters): cint;
  cdecl; external av__format;

(**
 * Opens a media file as input. The codecs are not opened. Only the file
 * header (if present) is read.
 *
 * @param ic_ptr The opened media file handle is put here.
 * @param filename filename to open
 * @param fmt If non-NULL, force the file format to use.
 * @param buf_size optional buffer size (zero if default is OK)
 * @param ap Additional parameters needed when opening the file
 *           (NULL if default).
 * @return 0 if OK, AVERROR_xxx otherwise
 *)
function av_open_input_file(var ic_ptr: PAVFormatContext; filename: PAnsiChar;
                     fmt: PAVInputFormat; buf_size: cint;
                     ap: PAVFormatParameters): cint;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 52026000} // 52.26.0
(**
 * Allocates an AVFormatContext.
 * Can be freed with av_free() but do not forget to free everything you
 * explicitly allocated as well!
 *)
function avformat_alloc_context(): PAVFormatContext;
  cdecl; external av__format;
{$ELSE}
  {$IF LIBAVFORMAT_VERSION_MAJOR < 53}
(**
 * @deprecated Use avformat_alloc_context() instead.
 *)
function av_alloc_format_context(): PAVFormatContext;
  cdecl; external av__format;
  {$IFEND}
{$IFEND}

(**
 * Reads packets of a media file to get stream information. This
 * is useful for file formats with no headers such as MPEG. This
 * function also computes the real framerate in case of MPEG-2 repeat
 * frame mode.
 * The logical file position is not changed by this function;
 * examined packets may be buffered for later processing.
 *
 * @param ic media file handle
 * @return >=0 if OK, AVERROR_xxx on error
 * @todo Let the user decide somehow what information is needed so that
 *       we do not waste time getting stuff the user does not need.
 *)
function av_find_stream_info(ic: PAVFormatContext): cint;
  cdecl; external av__format;

(**
 * Reads a transport packet from a media file.
 *
 * This function is obsolete and should never be used.
 * Use av_read_frame() instead.
 *
 * @param s media file handle
 * @param pkt is filled
 * @return 0 if OK, AVERROR_xxx on error
 *)
function av_read_packet(s: PAVFormatContext; var pkt: TAVPacket): cint;
  cdecl; external av__format;

(**
 * Returns the next frame of a stream.
 *
 * The returned packet is valid
 * until the next av_read_frame() or until av_close_input_file() and
 * must be freed with av_free_packet. For video, the packet contains
 * exactly one frame. For audio, it contains an cint number of
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
 * data). If the audio frames have a variable size (e.g. MPEG audio),
 * then it contains one frame.
 *
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
 * values in AVStream.time_base units (and guessed if the format cannot
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
 * has B-frames, so it is better to rely on pkt->dts if you do not
 * decompress the payload.
 *
 * @return 0 if OK, < 0 on error or end of file
 *)
function av_read_frame(s: PAVFormatContext; var pkt: TAVPacket): cint;
  cdecl; external av__format;

(**
 * Seeks to the keyframe at timestamp.
 * 'timestamp' in 'stream_index'.
 * @param stream_index If stream_index is (-1), a default
 * stream is selected, and timestamp is automatically converted
 * from AV_TIME_BASE units to the stream specific time_base.
 * @param timestamp Timestamp in AVStream.time_base units
 *        or, if no stream is specified, in AV_TIME_BASE units.
 * @param flags flags which select direction and seeking mode
 * @return >= 0 on success
 *)
function av_seek_frame(s: PAVFormatContext; stream_index: cint; timestamp: cint64;
                       flags: cint): cint;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 52026000} // 52.26.0
(**
 * Seeks to timestamp ts.
 * Seeking will be done so that the point from which all active streams
 * can be presented successfully will be closest to ts and within min/max_ts.
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
 *
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in byte and
 * are the file position (this may not be supported by all demuxers).
 * If flags contain AVSEEK_FLAG_FRAME then all timestamps are in frames
 * in the stream with stream_index (this may not be supported by all demuxers).
 * Otherwise all timestamps are in units of the stream selected by stream_index
 * or if stream_index is -1, in AV_TIME_BASE units.
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
 * keyframes (this may not be supported by all demuxers).
 *
 * @param stream_index index of the stream which is used as time base reference.
 * @param min_ts smallest acceptable timestamp
 * @param ts target timestamp
 * @param max_ts largest acceptable timestamp
 * @param flags flags
 * @return >=0 on success, error code otherwise
 *
 * @NOTE This is part of the new seek API which is still under construction.
 *       Thus do not use this yet. It may change at any time, do not expect
 *       ABI compatibility yet!
 *)
function avformat_seek_file(s:            PAVFormatContext;
			    stream_index: cint;
			    min_ts:       cint64;
			    ts:           cint64;
			    max_ts:       cint64;
			    flags:        cint): cint;
  cdecl; external av__format;
{$IFEND}

(**
 * Starts playing a network-based stream (e.g. RTSP stream) at the
 * current position.
 *)
function av_read_play(s: PAVFormatContext): cint;
  cdecl; external av__format;

(**
 * Pauses a network-based stream (e.g. RTSP stream).
 *
 * Use av_read_play() to resume it.
 *)
function av_read_pause(s: PAVFormatContext): cint;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 52003000} // 52.3.0
(**
 * Frees a AVFormatContext allocated by av_open_input_stream.
 * @param s context to free
 *)
procedure av_close_input_stream(s: PAVFormatContext);
  cdecl; external av__format;
{$IFEND}

(**
 * Closes a media file (but not its codecs).
 *
 * @param s media file handle
 *)
procedure av_close_input_file(s: PAVFormatContext);
  cdecl; external av__format;

(**
 * Adds a new stream to a media file.
 *
 * Can only be called in the read_header() function. If the flag
 * AVFMTCTX_NOHEADER is in the format context, then new streams
 * can be added in read_packet too.
 *
 * @param s media file handle
 * @param id file-format-dependent stream ID
 *)
function av_new_stream(s: PAVFormatContext; id: cint): PAVStream;
  cdecl; external av__format;
{$IF LIBAVFORMAT_VERSION >= 51014000} // 51.14.0
function av_new_program(s: PAVFormatContext; id: cint): PAVProgram;
  cdecl; external av__format;
{$IFEND}

{$IF LIBAVFORMAT_VERSION >= 52014000} // 52.14.0
(**
 * Adds a new chapter.
 * This function is NOT part of the public API
 * and should ONLY be used by demuxers.
 *
 * @param s media file handle
 * @param id unique ID for this chapter
 * @param start chapter start time in time_base units
 * @param end chapter end time in time_base units
 * @param title chapter title
 *
 * @return AVChapter or NULL on error
 *)
function ff_new_chapter(s: PAVFormatContext; id: cint; time_base: TAVRational;
                        start, end_: cint64; title: {const} PAnsiChar): PAVChapter;
  cdecl; external av__format;
{$IFEND}

(**
 * Sets the pts for a given stream.
 *
 * @param s stream
 * @param pts_wrap_bits number of bits effectively used by the pts
 *        (used for wrap control, 33 is the value for MPEG)
 * @param pts_num numerator to convert to seconds (MPEG: 1)
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
 *)
procedure av_set_pts_info(s: PAVStream; pts_wrap_bits: cint;
{$IF LIBAVFORMAT_VERSION < 52036000} // < 52.36.0
                   pts_num: cint; pts_den: cint);
{$ELSE}
                   pts_num: cuint; pts_den: cuint);
{$IFEND}
  cdecl; external av__format;

const
  AVSEEK_FLAG_BACKWARD = 1; ///< seek backward
  AVSEEK_FLAG_BYTE     = 2; ///< seeking based on position in bytes
  AVSEEK_FLAG_ANY      = 4; ///< seek to any frame, even non-keyframes
{$IF LIBAVFORMAT_VERSION >= 52037000} // >= 52.37.0
  AVSEEK_FLAG_FRAME    = 8;
{$IFEND}

function av_find_default_stream_index(s: PAVFormatContext): cint;
  cdecl; external av__format;

(**
 * Gets the index for a specific timestamp.
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
 *                 to the timestamp which is <= the requested one, if backward
 *                 is 0, then it will be >=
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
 * @return < 0 if no such timestamp could be found
 *)
function av_index_search_timestamp(st: PAVStream; timestamp: cint64; flags: cint): cint;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
(**
 * Ensures the index uses less memory than the maximum specified in
 * AVFormatContext.max_index_size by discarding entries if it grows
 * too large.
 * This function is not part of the public API and should only be called
 * by demuxers.
 *)
procedure ff_reduce_index(s: PAVFormatContext; stream_index: cint);
  cdecl; external av__format;
{$IFEND}

(**
 * Adds an index entry into a sorted list. Updates the entry if the list
 * already contains it.
 *
 * @param timestamp timestamp in the timebase of the given stream
 *)
function av_add_index_entry(st: PAVStream; pos: cint64; timestamp: cint64;
                  size: cint; distance: cint; flags: cint): cint;
  cdecl; external av__format;

(**
 * Does a binary search using av_index_search_timestamp() and
 * AVCodec.read_timestamp().
 * This is not supposed to be called directly by a user application,
 * but by demuxers.
 * @param target_ts target timestamp in the time base of the given stream
 * @param stream_index stream number
 *)
function av_seek_frame_binary(s: PAVFormatContext; stream_index: cint;
                 target_ts: cint64; flags: cint): cint;
  cdecl; external av__format;


(**
 * Updates cur_dts of all streams based on the given timestamp and AVStream.
 *
 * Stream ref_st unchanged, others set cur_dts in their native time base.
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
 * @param timestamp new dts expressed in time_base of param ref_st
 * @param ref_st reference stream giving time_base of param timestamp
 *)
procedure av_update_cur_dts(s: PAVFormatContext; ref_st: PAVStream;
                            timestamp: cint64);
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 51007000} // 51.7.0
type
  TReadTimestampFunc = function (pavfc: PAVFormatContext;
    arg2: cint; arg3: Pint64; arg4: cint64): cint64; cdecl;

(**
 * Does a binary search using read_timestamp().
 * This is not supposed to be called directly by a user application,
 * but by demuxers.
 * @param target_ts target timestamp in the time base of the given stream
 * @param stream_index stream number
 *)
function av_gen_search(s: PAVFormatContext; stream_index: cint;
                       target_ts: cint64; pos_min: cint64;
                       pos_max: cint64; pos_limit: cint64;
                       ts_min: cint64; ts_max: cint64;
                       flags: cint; ts_ret: Pint64;
                       read_timestamp: TReadTimestampFunc): cint64;
  cdecl; external av__format;
{$IFEND}

(* media file output *)
function av_set_parameters(s: PAVFormatContext; ap: PAVFormatParameters): cint;
  cdecl; external av__format;

(**
 * Allocates the stream private data and writes the stream header to an
 * output media file.
 *
 * @param s media file handle
 * @return 0 if OK, AVERROR_xxx on error
 *)
function av_write_header(s: PAVFormatContext): cint;
  cdecl; external av__format;

(**
 * Writes a packet to an output media file.
 *
 * The packet shall contain one audio or video frame.
 * The packet must be correctly interleaved according to the container
 * specification, if not then av_interleaved_write_frame must be used.
 *
 * @param s media file handle
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
 *            dts/pts, ...
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
 *)
function av_write_frame(s: PAVFormatContext; var pkt: TAVPacket): cint;
  cdecl; external av__format;

(**
 * Writes a packet to an output media file ensuring correct interleaving.
 *
 * The packet must contain one audio or video frame.
 * If the packets are already correctly interleaved, the application should
 * call av_write_frame() instead as it is slightly faster. It is also important
 * to keep in mind that completely non-interleaved input will need huge amounts
 * of memory to interleave with this, so it is preferable to interleave at the
 * demuxer level.
 *
 * @param s media file handle
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
 *            dts/pts, ...
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
 *)
function av_interleaved_write_frame(s: PAVFormatContext; var pkt: TAVPacket): cint;
  cdecl; external av__format;

(**
 * Interleaves a packet per dts in an output media file.
 *
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
 * function, so they cannot be used after it. Note that calling av_free_packet()
 * on them is still safe.
 *
 * @param s media file handle
 * @param out the interleaved packet will be output here
 * @param in the input packet
 * @param flush 1 if no further packets are available as input and all
 *              remaining packets should be output
 * @return 1 if a packet was output, 0 if no packet could be output,
 *         < 0 if an error occurred
 *)
function av_interleave_packet_per_dts(s: PAVFormatContext; _out: PAVPacket;
                                      pkt: PAVPacket; flush: cint): cint;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION >= 52025000} // 52.25.0
(**
 * Add packet to AVFormatContext->packet_buffer list, determining its
 * interleaved position using compare() function argument.
 *
 * This function is not part of the public API and should only be called
 * by muxers using their own interleave function.
 *)
{
procedure ff_interleave_add_packet(s:   PAVFormatContext;
                                   pkt: PAVPacket;
		   compare: function(para1: PAVFormatContext;
				     para2: PAVPacket;
				     para3: PAVPacket): cint);
  cdecl; external av__format;
}
{$IFEND}

(**
 * Writes the stream trailer to an output media file and frees the
 * file private data.
 *
 * May only be called after a successful call to av_write_header.
 *
 * @param s media file handle
 * @return 0 if OK, AVERROR_xxx on error
 *)
function av_write_trailer(s: pAVFormatContext): cint;
  cdecl; external av__format;

procedure dump_format(ic: PAVFormatContext; index: cint; url: PAnsiChar;
               is_output: cint);
  cdecl; external av__format;

(**
 * Parses width and height out of string str.
 * @deprecated Use av_parse_video_frame_size instead.
 *)
function parse_image_size(width_ptr: PCint; height_ptr: PCint;
                          str: PAnsiChar): cint;
  cdecl; external av__format; deprecated;

{$IF LIBAVFORMAT_VERSION_MAJOR < 53}
(**
 * Converts framerate from a string to a fraction.
 * @deprecated Use av_parse_video_frame_rate instead.
 *)
function parse_frame_rate(frame_rate: PCint; frame_rate_base: PCint;
                          arg: PByteArray): cint;
  cdecl; external av__format; deprecated;
{$IFEND}

(**
 * Parses datestr and returns a corresponding number of microseconds.
 * @param datestr String representing a date or a duration.
 * - If a date the syntax is:
 * @code
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
 * @endcode
 * Time is localtime unless Z is appended, in which case it is
 * interpreted as UTC.
 * If the year-month-day part is not specified it takes the current
 * year-month-day.
 * Returns the number of microseconds since 1st of January, 1970 up to
 * the time of the parsed date or INT64_MIN if datestr cannot be
 * successfully parsed.
 * - If a duration the syntax is:
 * @code
 *  [-]HH[:MM[:SS[.m...]]]
 *  [-]S+[.m...]
 * @endcode
 * Returns the number of microseconds contained in a time interval
 * with the specified duration or INT64_MIN if datestr cannot be
 * successfully parsed.
 * @param duration Flag which tells how to interpret datestr, if
 * not zero datestr is interpreted as a duration, otherwise as a
 * date.
 *)
function parse_date(datestr: PAnsiChar; duration: cint): cint64;
  cdecl; external av__format;

(** Gets the current time in microseconds. *)
function av_gettime(): cint64;
  cdecl; external av__format;

(* ffm-specific for ffserver *)
const
  FFM_PACKET_SIZE = 4096;

function ffm_read_write_index(fd: cint): cint64;
  cdecl; external av__format;

{$IF LIBAVFORMAT_VERSION < 52027000} // 52.27.0
procedure ffm_write_write_index(fd: cint; pos: cint64);
{$ELSE}
function ffm_write_write_index(fd: cint; pos: cint64): cint;
{$IFEND}
  cdecl; external av__format;

procedure ffm_set_write_index(s: PAVFormatContext; pos: cint64; file_size: cint64);
  cdecl; external av__format;

(**
 * Attempts to find a specific tag in a URL.
 *
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
 * Return 1 if found.
 *)
function find_info_tag(arg: PAnsiChar; arg_size: cint; tag1: PAnsiChar; info: PAnsiChar): cint;
  cdecl; external av__format;

(**
 * Returns in 'buf' the path with '%d' replaced by a number.
 *
 * Also handles the '%0nd' format where 'n' is the total number
 * of digits and '%%'.
 *
 * @param buf destination buffer
 * @param buf_size destination buffer size
 * @param path numbered sequence string
 * @param number frame number
 * @return 0 if OK, -1 on format error
 *)
function av_get_frame_filename(buf: PAnsiChar; buf_size: cint;
                               path: PAnsiChar; number: cint): cint;
  cdecl; external av__format
  {$IF LIBAVFORMAT_VERSION <= 50006000} // 50.6.0
  name 'get_frame_filename'
  {$IFEND};

(**
 * Checks whether filename actually is a numbered sequence generator.
 *
 * @param filename possible numbered sequence string
 * @return 1 if a valid numbered sequence string, 0 otherwise
 *)
function av_filename_number_test(filename: PAnsiChar): cint;
  cdecl; external av__format
  {$IF LIBAVFORMAT_VERSION <= 50006000} // 50.6.0
  name 'filename_number_test'
  {$IFEND};

{$IF LIBAVFORMAT_VERSION >= 51012002} // 51.12.2
(**
 * Generates an SDP for an RTP session.
 *
 * @param ac array of AVFormatContexts describing the RTP streams. If the
 *           array is composed by only one context, such context can contain
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
 *           all the contexts in the array (an AVCodecContext per RTP stream)
 *           must contain only one AVStream.
 * @param n_files number of AVCodecContexts contained in ac
 * @param buff buffer where the SDP will be stored (must be allocated by
 *             the caller)
 * @param size the size of the buffer
 * @return 0 if OK, AVERROR_xxx on error
 *)
function avf_sdp_create(ac: PPAVFormatContext; n_files: cint; buff: PByteArray; size: cint): cint;
  cdecl; external av__format;
{$IFEND}

{$IF LIBAVFORMAT_VERSION >= 52060000} // 52.60.0
(**
 * Returns a positive value if the given filename has one of the given
 * extensions, 0 otherwise.
 *
 * @param extensions a comma-separated list of filename extensions
 *)
function av_match_ext(filename: {const} Pchar; extensions: {const} Pchar): cint;
  cdecl; external av__format;
{$IFEND}

implementation

{$IF LIBAVFORMAT_VERSION < 51012002} // 51.12.2
procedure av_init_packet(var pkt: TAVPacket);
begin
  with pkt do begin
    pts   := AV_NOPTS_VALUE;
    dts   := AV_NOPTS_VALUE;
    pos   := -1;
    duration := 0;
    flags := 0;
    stream_index := 0;
    destruct := @av_destruct_packet_nofree
  end
end;
{$IFEND}

{$IF LIBAVFORMAT_VERSION < 52032000} // < 52.32.0
procedure av_free_packet(pkt: PAVPacket);
begin
  if ((pkt <> nil) and (@pkt^.destruct <> nil)) then
    pkt^.destruct(pkt);
end;
{$IFEND}

end.