aboutsummaryrefslogtreecommitdiffstats
path: root/libavdevice/dshow.c
blob: 6e9730485003235d7f5ffef536e74d610c77250b (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
/*
 * Directshow capture interface
 * Copyright (c) 2010 Ramiro Polla
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "dshow_capture.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavutil/mem.h"
#include "libavformat/demux.h"
#include "libavformat/internal.h"
#include "libavformat/riff.h"
#include "avdevice.h"
#include "libavcodec/raw.h"
#include "objidl.h"
#include "shlwapi.h"
// NB: technically, we should include dxva.h and use
// DXVA_ExtendedFormat, but that type is not defined in
// the MinGW headers. The DXVA2_ExtendedFormat and the
// contents of its fields is identical to
// DXVA_ExtendedFormat (see https://docs.microsoft.com/en-us/windows/win32/medfound/extended-color-information#color-space-in-media-types)
// and is provided by MinGW as well, so we use that
// instead. NB also that per the Microsoft docs, the
// lowest 8 bits of the structure, i.e. the SampleFormat
// field, contain AMCONTROL_xxx flags instead of sample
// format information, and should thus not be used.
// NB further that various values in the structure's
// fields (e.g. BT.2020 color space) are not provided
// for either of the DXVA structs, but are provided in
// the flags of the corresponding fields of Media Foundation.
// These may be provided by DirectShow devices (e.g. LAVFilters
// does so). So we use those values here too (the equivalence is
// indicated by Microsoft example code: https://docs.microsoft.com/en-us/windows/win32/api/dxva2api/ns-dxva2api-dxva2_videodesc)
#include "d3d9types.h"
#include "dxva2api.h"

#ifndef AMCONTROL_COLORINFO_PRESENT
// not defined in some versions of MinGW's dvdmedia.h
#   define AMCONTROL_COLORINFO_PRESENT 0x00000080 // if set, indicates DXVA color info is present in the upper (24) bits of the dwControlFlags
#endif


static enum AVPixelFormat dshow_pixfmt(DWORD biCompression, WORD biBitCount)
{
    switch(biCompression) {
    case BI_BITFIELDS:
    case BI_RGB:
        switch(biBitCount) { /* 1-8 are untested */
            case 1:
                return AV_PIX_FMT_MONOWHITE;
            case 4:
                return AV_PIX_FMT_RGB4;
            case 8:
                return AV_PIX_FMT_RGB8;
            case 16:
                return AV_PIX_FMT_RGB555;
            case 24:
                return AV_PIX_FMT_BGR24;
            case 32:
                return AV_PIX_FMT_0RGB32;
        }
    }
    return avpriv_pix_fmt_find(PIX_FMT_LIST_RAW, biCompression); // all others
}

static enum AVColorRange dshow_color_range(DXVA2_ExtendedFormat *fmt_info)
{
    switch (fmt_info->NominalRange)
    {
    case DXVA2_NominalRange_Unknown:
        return AVCOL_RANGE_UNSPECIFIED;
    case DXVA2_NominalRange_Normal: // equal to DXVA2_NominalRange_0_255
        return AVCOL_RANGE_JPEG;
    case DXVA2_NominalRange_Wide:   // equal to DXVA2_NominalRange_16_235
        return AVCOL_RANGE_MPEG;
    case DXVA2_NominalRange_48_208:
        // not an ffmpeg color range
        return AVCOL_RANGE_UNSPECIFIED;

    // values from MediaFoundation SDK (mfobjects.h)
    case 4:     // MFNominalRange_64_127
        // not an ffmpeg color range
        return AVCOL_RANGE_UNSPECIFIED;

    default:
        return AVCOL_RANGE_UNSPECIFIED;
    }
}

static enum AVColorSpace dshow_color_space(DXVA2_ExtendedFormat *fmt_info)
{
    switch (fmt_info->VideoTransferMatrix)
    {
    case DXVA2_VideoTransferMatrix_BT709:
        return AVCOL_SPC_BT709;
    case DXVA2_VideoTransferMatrix_BT601:
        return AVCOL_SPC_BT470BG;
    case DXVA2_VideoTransferMatrix_SMPTE240M:
        return AVCOL_SPC_SMPTE240M;

    // values from MediaFoundation SDK (mfobjects.h)
    case 4:     // MFVideoTransferMatrix_BT2020_10
    case 5:     // MFVideoTransferMatrix_BT2020_12
        if (fmt_info->VideoTransferFunction == 12)  // MFVideoTransFunc_2020_const
            return AVCOL_SPC_BT2020_CL;
        else
            return AVCOL_SPC_BT2020_NCL;

    default:
        return AVCOL_SPC_UNSPECIFIED;
    }
}

static enum AVColorPrimaries dshow_color_primaries(DXVA2_ExtendedFormat *fmt_info)
{
    switch (fmt_info->VideoPrimaries)
    {
    case DXVA2_VideoPrimaries_Unknown:
        return AVCOL_PRI_UNSPECIFIED;
    case DXVA2_VideoPrimaries_reserved:
        return AVCOL_PRI_RESERVED;
    case DXVA2_VideoPrimaries_BT709:
        return AVCOL_PRI_BT709;
    case DXVA2_VideoPrimaries_BT470_2_SysM:
        return AVCOL_PRI_BT470M;
    case DXVA2_VideoPrimaries_BT470_2_SysBG:
    case DXVA2_VideoPrimaries_EBU3213:   // this is PAL
        return AVCOL_PRI_BT470BG;
    case DXVA2_VideoPrimaries_SMPTE170M:
    case DXVA2_VideoPrimaries_SMPTE_C:
        return AVCOL_PRI_SMPTE170M;
    case DXVA2_VideoPrimaries_SMPTE240M:
        return AVCOL_PRI_SMPTE240M;

    // values from MediaFoundation SDK (mfobjects.h)
    case 9:     // MFVideoPrimaries_BT2020
        return AVCOL_PRI_BT2020;
    case 10:    // MFVideoPrimaries_XYZ
        return AVCOL_PRI_SMPTE428;
    case 11:    // MFVideoPrimaries_DCI_P3
        return AVCOL_PRI_SMPTE431;
    case 12:    // MFVideoPrimaries_ACES (Academy Color Encoding System)
        // not an FFmpeg color primary
        return AVCOL_PRI_UNSPECIFIED;

    default:
        return AVCOL_PRI_UNSPECIFIED;
    }
}

static enum AVColorTransferCharacteristic dshow_color_trc(DXVA2_ExtendedFormat *fmt_info)
{
    switch (fmt_info->VideoTransferFunction)
    {
    case DXVA2_VideoTransFunc_Unknown:
        return AVCOL_TRC_UNSPECIFIED;
    case DXVA2_VideoTransFunc_10:
        return AVCOL_TRC_LINEAR;
    case DXVA2_VideoTransFunc_18:
        // not an FFmpeg transfer characteristic
        return AVCOL_TRC_UNSPECIFIED;
    case DXVA2_VideoTransFunc_20:
        // not an FFmpeg transfer characteristic
        return AVCOL_TRC_UNSPECIFIED;
    case DXVA2_VideoTransFunc_22:
        return AVCOL_TRC_GAMMA22;
    case DXVA2_VideoTransFunc_709:
        return AVCOL_TRC_BT709;
    case DXVA2_VideoTransFunc_240M:
        return AVCOL_TRC_SMPTE240M;
    case DXVA2_VideoTransFunc_sRGB:
        return AVCOL_TRC_IEC61966_2_1;
    case DXVA2_VideoTransFunc_28:
        return AVCOL_TRC_GAMMA28;

    // values from MediaFoundation SDK (mfobjects.h)
    case 9:     // MFVideoTransFunc_Log_100
        return AVCOL_TRC_LOG;
    case 10:    // MFVideoTransFunc_Log_316
        return AVCOL_TRC_LOG_SQRT;
    case 11:    // MFVideoTransFunc_709_sym
        // not an FFmpeg transfer characteristic
        return AVCOL_TRC_UNSPECIFIED;
    case 12:    // MFVideoTransFunc_2020_const
    case 13:    // MFVideoTransFunc_2020
        if (fmt_info->VideoTransferMatrix == 5) // MFVideoTransferMatrix_BT2020_12
            return AVCOL_TRC_BT2020_12;
        else
            return AVCOL_TRC_BT2020_10;
    case 14:    // MFVideoTransFunc_26
        // not an FFmpeg transfer characteristic
        return AVCOL_TRC_UNSPECIFIED;
    case 15:    // MFVideoTransFunc_2084
        return AVCOL_TRC_SMPTEST2084;
    case 16:    // MFVideoTransFunc_HLG
        return AVCOL_TRC_ARIB_STD_B67;
    case 17:    // MFVideoTransFunc_10_rel
        // not an FFmpeg transfer characteristic? Undocumented also by MS
        return AVCOL_TRC_UNSPECIFIED;

    default:
        return AVCOL_TRC_UNSPECIFIED;
    }
}

static enum AVChromaLocation dshow_chroma_loc(DXVA2_ExtendedFormat *fmt_info)
{
    if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_Cosited)       // that is: (DXVA2_VideoChromaSubsampling_Horizontally_Cosited | DXVA2_VideoChromaSubsampling_Vertically_Cosited | DXVA2_VideoChromaSubsampling_Vertically_AlignedChromaPlanes)
        return AVCHROMA_LOC_TOPLEFT;
    else if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_MPEG1)    // that is: DXVA2_VideoChromaSubsampling_Vertically_AlignedChromaPlanes
        return AVCHROMA_LOC_CENTER;
    else if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_MPEG2)    // that is: (DXVA2_VideoChromaSubsampling_Horizontally_Cosited | DXVA2_VideoChromaSubsampling_Vertically_AlignedChromaPlanes)
        return AVCHROMA_LOC_LEFT;
    else if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_DV_PAL)   // that is: (DXVA2_VideoChromaSubsampling_Horizontally_Cosited | DXVA2_VideoChromaSubsampling_Vertically_Cosited)
        return AVCHROMA_LOC_TOPLEFT;
    else
        // unknown
        return AVCHROMA_LOC_UNSPECIFIED;
}

static int
dshow_read_close(AVFormatContext *s)
{
    struct dshow_ctx *ctx = s->priv_data;
    PacketListEntry *pktl;

    if (ctx->control) {
        IMediaControl_Stop(ctx->control);
        IMediaControl_Release(ctx->control);
    }

    if (ctx->media_event)
        IMediaEvent_Release(ctx->media_event);

    if (ctx->graph) {
        IEnumFilters *fenum;
        int r;
        r = IGraphBuilder_EnumFilters(ctx->graph, &fenum);
        if (r == S_OK) {
            IBaseFilter *f;
            IEnumFilters_Reset(fenum);
            while (IEnumFilters_Next(fenum, 1, &f, NULL) == S_OK) {
                if (IGraphBuilder_RemoveFilter(ctx->graph, f) == S_OK)
                    IEnumFilters_Reset(fenum); /* When a filter is removed,
                                                * the list must be reset. */
                IBaseFilter_Release(f);
            }
            IEnumFilters_Release(fenum);
        }
        IGraphBuilder_Release(ctx->graph);
    }

    if (ctx->capture_pin[VideoDevice])
        ff_dshow_pin_Release(ctx->capture_pin[VideoDevice]);
    if (ctx->capture_pin[AudioDevice])
        ff_dshow_pin_Release(ctx->capture_pin[AudioDevice]);
    if (ctx->capture_filter[VideoDevice])
        ff_dshow_filter_Release(ctx->capture_filter[VideoDevice]);
    if (ctx->capture_filter[AudioDevice])
        ff_dshow_filter_Release(ctx->capture_filter[AudioDevice]);

    if (ctx->device_pin[VideoDevice])
        IPin_Release(ctx->device_pin[VideoDevice]);
    if (ctx->device_pin[AudioDevice])
        IPin_Release(ctx->device_pin[AudioDevice]);
    if (ctx->device_filter[VideoDevice])
        IBaseFilter_Release(ctx->device_filter[VideoDevice]);
    if (ctx->device_filter[AudioDevice])
        IBaseFilter_Release(ctx->device_filter[AudioDevice]);

    av_freep(&ctx->device_name[0]);
    av_freep(&ctx->device_name[1]);
    av_freep(&ctx->device_unique_name[0]);
    av_freep(&ctx->device_unique_name[1]);

    if(ctx->mutex)
        CloseHandle(ctx->mutex);
    if(ctx->event[0])
        CloseHandle(ctx->event[0]);
    if(ctx->event[1])
        CloseHandle(ctx->event[1]);

    pktl = ctx->pktl;
    while (pktl) {
        PacketListEntry *next = pktl->next;
        av_packet_unref(&pktl->pkt);
        av_free(pktl);
        pktl = next;
    }

    CoUninitialize();

    return 0;
}

static char *dup_wchar_to_utf8(wchar_t *w)
{
    char *s = NULL;
    int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
    s = av_malloc(l);
    if (s)
        WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
    return s;
}

static int shall_we_drop(AVFormatContext *s, int index, enum dshowDeviceType devtype)
{
    struct dshow_ctx *ctx = s->priv_data;
    static const uint8_t dropscore[] = {62, 75, 87, 100};
    const int ndropscores = FF_ARRAY_ELEMS(dropscore);
    unsigned int buffer_fullness = (ctx->curbufsize[index]*100)/s->max_picture_buffer;
    const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";

    if(dropscore[++ctx->video_frame_num%ndropscores] <= buffer_fullness) {
        av_log(s, AV_LOG_ERROR,
              "real-time buffer [%s] [%s input] too full or near too full (%d%% of size: %d [rtbufsize parameter])! frame dropped!\n",
              ctx->device_name[devtype], devtypename, buffer_fullness, s->max_picture_buffer);
        return 1;
    }

    return 0;
}

static void
callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time, enum dshowDeviceType devtype)
{
    AVFormatContext *s = priv_data;
    struct dshow_ctx *ctx = s->priv_data;
    PacketListEntry **ppktl, *pktl_next;

//    dump_videohdr(s, vdhdr);

    WaitForSingleObject(ctx->mutex, INFINITE);

    if(shall_we_drop(s, index, devtype))
        goto fail;

    pktl_next = av_mallocz(sizeof(*pktl_next));
    if(!pktl_next)
        goto fail;

    if(av_new_packet(&pktl_next->pkt, buf_size) < 0) {
        av_free(pktl_next);
        goto fail;
    }

    pktl_next->pkt.stream_index = index;
    pktl_next->pkt.pts = time;
    memcpy(pktl_next->pkt.data, buf, buf_size);

    for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
    *ppktl = pktl_next;
    ctx->curbufsize[index] += buf_size;

    SetEvent(ctx->event[1]);
    ReleaseMutex(ctx->mutex);

    return;
fail:
    ReleaseMutex(ctx->mutex);
    return;
}

static void
dshow_get_device_media_types(AVFormatContext *avctx, enum dshowDeviceType devtype,
                                         enum dshowSourceFilterType sourcetype, IBaseFilter *device_filter,
                                         enum AVMediaType **media_types, int *nb_media_types)
{
    IEnumPins *pins = 0;
    IPin *pin;
    int has_audio = 0, has_video = 0;

    if (IBaseFilter_EnumPins(device_filter, &pins) != S_OK)
        return;

    while (IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
        IKsPropertySet *p = NULL;
        PIN_INFO info = { 0 };
        GUID category;
        DWORD r2;
        IEnumMediaTypes *types = NULL;
        AM_MEDIA_TYPE *type;

        if (IPin_QueryPinInfo(pin, &info) != S_OK)
            goto next;
        IBaseFilter_Release(info.pFilter);

        if (info.dir != PINDIR_OUTPUT)
            goto next;
        if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
            goto next;
        if (IKsPropertySet_Get(p, &AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
                               NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
            goto next;
        if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
            goto next;

        if (IPin_EnumMediaTypes(pin, &types) != S_OK)
            goto next;

        // enumerate media types exposed by pin
        // NB: don't know if a pin can expose both audio and video, check 'm all to be safe
        IEnumMediaTypes_Reset(types);
        while (IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
            if (IsEqualGUID(&type->majortype, &MEDIATYPE_Video)) {
                has_video = 1;
            } else if (IsEqualGUID(&type->majortype, &MEDIATYPE_Audio)) {
                has_audio = 1;
            }
            CoTaskMemFree(type);
        }

    next:
        if (types)
            IEnumMediaTypes_Release(types);
        if (p)
            IKsPropertySet_Release(p);

        IPin_Release(pin);
    }

    IEnumPins_Release(pins);

    if (has_audio || has_video) {
        int nb_types = has_audio + has_video;
        *media_types = av_malloc_array(nb_types, sizeof(enum AVMediaType));
        if (*media_types) {
            if (has_audio)
                (*media_types)[0] = AVMEDIA_TYPE_AUDIO;
            if (has_video)
                (*media_types)[0 + has_audio] = AVMEDIA_TYPE_VIDEO;
            *nb_media_types = nb_types;
        }
    }
}

/**
 * Cycle through available devices using the device enumerator devenum,
 * retrieve the device with type specified by devtype and return the
 * pointer to the object found in *pfilter.
 * If pfilter is NULL, list all device names.
 * If device_list is not NULL, populate it with found devices instead of
 * outputting device names to log
 */
static int
dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
                    enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype,
                    IBaseFilter **pfilter, char **device_unique_name,
                    AVDeviceInfoList **device_list)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    IBaseFilter *device_filter = NULL;
    IEnumMoniker *classenum = NULL;
    IMoniker *m = NULL;
    const char *device_name = ctx->device_name[devtype];
    int skip = (devtype == VideoDevice) ? ctx->video_device_number
                                        : ctx->audio_device_number;
    int r;

    const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
                                   &CLSID_AudioInputDeviceCategory };
    const char *devtypename = (devtype == VideoDevice) ? "video" : "audio only";
    const char *sourcetypename = (sourcetype == VideoSourceDevice) ? "video" : "audio";

    r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[sourcetype],
                                             (IEnumMoniker **) &classenum, 0);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices (or none found).\n",
               devtypename);
        return AVERROR(EIO);
    }

    while (!device_filter && IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK) {
        IPropertyBag *bag = NULL;
        char *friendly_name = NULL;
        char *unique_name = NULL;
        VARIANT var;
        IBindCtx *bind_ctx = NULL;
        LPOLESTR olestr = NULL;
        LPMALLOC co_malloc = NULL;
        AVDeviceInfo *device = NULL;
        enum AVMediaType *media_types = NULL;
        int nb_media_types = 0;
        int i;

        r = CoGetMalloc(1, &co_malloc);
        if (r != S_OK)
            goto fail;
        r = CreateBindCtx(0, &bind_ctx);
        if (r != S_OK)
            goto fail;
        /* GetDisplayname works for both video and audio, DevicePath doesn't */
        r = IMoniker_GetDisplayName(m, bind_ctx, NULL, &olestr);
        if (r != S_OK)
            goto fail;
        unique_name = dup_wchar_to_utf8(olestr);
        /* replace ':' with '_' since we use : to delineate between sources */
        for (i = 0; i < strlen(unique_name); i++) {
            if (unique_name[i] == ':')
                unique_name[i] = '_';
        }

        r = IMoniker_BindToStorage(m, 0, 0, &IID_IPropertyBag, (void *) &bag);
        if (r != S_OK)
            goto fail;

        var.vt = VT_BSTR;
        r = IPropertyBag_Read(bag, L"FriendlyName", &var, NULL);
        if (r != S_OK)
            goto fail;
        friendly_name = dup_wchar_to_utf8(var.bstrVal);

        if (pfilter) {
            if (strcmp(device_name, friendly_name) && strcmp(device_name, unique_name))
                goto fail;

            if (!skip--) {
                r = IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
                if (r != S_OK) {
                    av_log(avctx, AV_LOG_ERROR, "Unable to BindToObject for %s\n", device_name);
                    goto fail;
                }
                *device_unique_name = unique_name;
                unique_name = NULL;
                // success, loop will end now
            }
        } else {
            // get media types exposed by pins of device
            if (IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void* ) &device_filter) == S_OK) {
                dshow_get_device_media_types(avctx, devtype, sourcetype, device_filter, &media_types, &nb_media_types);
                IBaseFilter_Release(device_filter);
                device_filter = NULL;
            }
            if (device_list) {
                device = av_mallocz(sizeof(AVDeviceInfo));
                if (!device)
                    goto fail;

                device->device_name = av_strdup(unique_name);
                device->device_description = av_strdup(friendly_name);
                if (!device->device_name || !device->device_description)
                    goto fail;

                // make space in device_list for this new device
                if (av_reallocp_array(&(*device_list)->devices,
                                     (*device_list)->nb_devices + 1,
                                     sizeof(*(*device_list)->devices)) < 0)
                    goto fail;

                // attach media_types to device
                device->nb_media_types = nb_media_types;
                device->media_types = media_types;
                nb_media_types = 0;
                media_types = NULL;

                // store device in list
                (*device_list)->devices[(*device_list)->nb_devices] = device;
                (*device_list)->nb_devices++;
                device = NULL;  // copied into array, make sure not freed below
            }
            else {
                av_log(avctx, AV_LOG_INFO, "\"%s\"", friendly_name);
                if (nb_media_types > 0) {
                    const char* media_type = av_get_media_type_string(media_types[0]);
                    av_log(avctx, AV_LOG_INFO, " (%s", media_type ? media_type : "unknown");
                    for (int i = 1; i < nb_media_types; ++i) {
                        media_type = av_get_media_type_string(media_types[i]);
                        av_log(avctx, AV_LOG_INFO, ", %s", media_type ? media_type : "unknown");
                    }
                    av_log(avctx, AV_LOG_INFO, ")");
                } else {
                    av_log(avctx, AV_LOG_INFO, " (none)");
                }
                av_log(avctx, AV_LOG_INFO, "\n");
                av_log(avctx, AV_LOG_INFO, "  Alternative name \"%s\"\n", unique_name);
            }
        }

    fail:
        av_freep(&media_types);
        if (device) {
            av_freep(&device->device_name);
            av_freep(&device->device_description);
            // NB: no need to av_freep(&device->media_types), its only moved to device once nothing can fail anymore
            av_free(device);
        }
        if (olestr && co_malloc)
            IMalloc_Free(co_malloc, olestr);
        if (bind_ctx)
            IBindCtx_Release(bind_ctx);
        av_freep(&friendly_name);
        av_freep(&unique_name);
        if (bag)
            IPropertyBag_Release(bag);
        IMoniker_Release(m);
    }

    IEnumMoniker_Release(classenum);

    if (pfilter) {
        if (!device_filter) {
            av_log(avctx, AV_LOG_ERROR, "Could not find %s device with name [%s] among source devices of type %s.\n",
                   devtypename, device_name, sourcetypename);
            return AVERROR(EIO);
        }
        *pfilter = device_filter;
    }

    return 0;
}

static int dshow_get_device_list(AVFormatContext *avctx, AVDeviceInfoList *device_list)
{
    ICreateDevEnum *devenum = NULL;
    int r;
    int ret = AVERROR(EIO);

    if (!device_list)
        return AVERROR(EINVAL);

    CoInitialize(0);

    r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
        &IID_ICreateDevEnum, (void**)&devenum);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
        goto error;
    }

    ret = dshow_cycle_devices(avctx, devenum, VideoDevice, VideoSourceDevice, NULL, NULL, &device_list);
    if (ret < S_OK && ret != AVERROR(EIO))
        goto error;
    ret = dshow_cycle_devices(avctx, devenum, AudioDevice, AudioSourceDevice, NULL, NULL, &device_list);

error:
    if (devenum)
        ICreateDevEnum_Release(devenum);

    CoUninitialize();

    return ret;
}

static int dshow_should_set_format(AVFormatContext *avctx, enum dshowDeviceType devtype)
{
    struct dshow_ctx *ctx = avctx->priv_data;

    return (devtype == VideoDevice && (ctx->framerate ||
                                      (ctx->requested_width && ctx->requested_height) ||
                                       ctx->pixel_format != AV_PIX_FMT_NONE ||
                                       ctx->video_codec_id != AV_CODEC_ID_RAWVIDEO))
        || (devtype == AudioDevice && (ctx->channels || ctx->sample_size || ctx->sample_rate));
}


struct dshow_format_info {
    enum dshowDeviceType devtype;
    // video
    int64_t framerate;
    enum AVPixelFormat pix_fmt;
    enum AVCodecID codec_id;
    enum AVColorRange col_range;
    enum AVColorSpace col_space;
    enum AVColorPrimaries col_prim;
    enum AVColorTransferCharacteristic col_trc;
    enum AVChromaLocation chroma_loc;
    int width;
    int height;
    // audio
    int sample_rate;
    int sample_size;
    int channels;
};

// user must av_free the returned pointer
static struct dshow_format_info *dshow_get_format_info(AM_MEDIA_TYPE *type)
{
    struct dshow_format_info *fmt_info = NULL;
    BITMAPINFOHEADER *bih;
    DXVA2_ExtendedFormat *extended_format_info = NULL;
    WAVEFORMATEX *fx;
    enum dshowDeviceType devtype;
    int64_t framerate;

    if (!type)
        return NULL;

    if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
        VIDEOINFOHEADER *v = (void *) type->pbFormat;
        framerate = v->AvgTimePerFrame;
        bih       = &v->bmiHeader;
        devtype   = VideoDevice;
    } else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
        VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
        devtype   = VideoDevice;
        framerate = v->AvgTimePerFrame;
        bih       = &v->bmiHeader;
        if (v->dwControlFlags & AMCONTROL_COLORINFO_PRESENT)
            extended_format_info = (DXVA2_ExtendedFormat *) &v->dwControlFlags;
    } else if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
        fx = (void *) type->pbFormat;
        devtype = AudioDevice;
    } else {
        return NULL;
    }

    fmt_info = av_mallocz(sizeof(struct dshow_format_info));
    if (!fmt_info)
        return NULL;
    // initialize fields where unset is not zero
    fmt_info->pix_fmt = AV_PIX_FMT_NONE;
    fmt_info->col_space = AVCOL_SPC_UNSPECIFIED;
    fmt_info->col_prim = AVCOL_PRI_UNSPECIFIED;
    fmt_info->col_trc = AVCOL_TRC_UNSPECIFIED;
    // now get info about format
    fmt_info->devtype = devtype;
    if (devtype == VideoDevice) {
        fmt_info->width = bih->biWidth;
        fmt_info->height = bih->biHeight;
        fmt_info->framerate = framerate;
        fmt_info->pix_fmt = dshow_pixfmt(bih->biCompression, bih->biBitCount);
        if (fmt_info->pix_fmt == AV_PIX_FMT_NONE) {
            const AVCodecTag *const tags[] = { avformat_get_riff_video_tags(), NULL };
            fmt_info->codec_id = av_codec_get_id(tags, bih->biCompression);
        }
        else
            fmt_info->codec_id = AV_CODEC_ID_RAWVIDEO;

        if (extended_format_info) {
            fmt_info->col_range = dshow_color_range(extended_format_info);
            fmt_info->col_space = dshow_color_space(extended_format_info);
            fmt_info->col_prim = dshow_color_primaries(extended_format_info);
            fmt_info->col_trc = dshow_color_trc(extended_format_info);
            fmt_info->chroma_loc = dshow_chroma_loc(extended_format_info);
        }
    } else {
        fmt_info->sample_rate = fx->nSamplesPerSec;
        fmt_info->sample_size = fx->wBitsPerSample;
        fmt_info->channels = fx->nChannels;
    }

    return fmt_info;
}

static void dshow_get_default_format(IPin *pin, IAMStreamConfig *config, enum dshowDeviceType devtype, AM_MEDIA_TYPE **type)
{
    HRESULT hr;

    if ((hr = IAMStreamConfig_GetFormat(config, type)) != S_OK) {
        if (hr == E_NOTIMPL || !IsEqualGUID(&(*type)->majortype, devtype == VideoDevice ? &MEDIATYPE_Video : &MEDIATYPE_Audio)) {
            // default not available or of wrong type,
            // fall back to iterating exposed formats
            // until one of the right type is found
            IEnumMediaTypes* types = NULL;
            if (IPin_EnumMediaTypes(pin, &types) != S_OK)
                return;
            IEnumMediaTypes_Reset(types);
            while (IEnumMediaTypes_Next(types, 1, type, NULL) == S_OK) {
                if (IsEqualGUID(&(*type)->majortype, devtype == VideoDevice ? &MEDIATYPE_Video : &MEDIATYPE_Audio)) {
                    break;
                }
                CoTaskMemFree(*type);
                *type = NULL;
            }
            IEnumMediaTypes_Release(types);
        }
    }
}

/**
 * Cycle through available formats available from the specified pin,
 * try to set parameters specified through AVOptions, or the pin's
 * default format if no such parameters were set. If successful,
 * return 1 in *pformat_set.
 * If pformat_set is NULL, list all pin capabilities.
 */
static void
dshow_cycle_formats(AVFormatContext *avctx, enum dshowDeviceType devtype,
                    IPin *pin, int *pformat_set)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    IAMStreamConfig *config = NULL;
    AM_MEDIA_TYPE *type = NULL;
    AM_MEDIA_TYPE *previous_match_type = NULL;
    int format_set = 0;
    void *caps = NULL;
    int i, n, size, r;
    int wait_for_better = 0;
    int use_default;

    // format parameters requested by user
    // if none are requested by user, the values will below be set to
    // those of the default format
    // video
    enum AVCodecID requested_video_codec_id   = ctx->video_codec_id;
    enum AVPixelFormat requested_pixel_format = ctx->pixel_format;
    int64_t requested_framerate               = ctx->framerate ? ((int64_t)ctx->requested_framerate.den * 10000000)
                                                                    / ctx->requested_framerate.num : 0;
    int requested_width                       = ctx->requested_width;
    int requested_height                      = ctx->requested_height;
    // audio
    int requested_sample_rate                 = ctx->sample_rate;
    int requested_sample_size                 = ctx->sample_size;
    int requested_channels                    = ctx->channels;

    if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
        return;
    if (IAMStreamConfig_GetNumberOfCapabilities(config, &n, &size) != S_OK)
        goto end;

    caps = av_malloc(size);
    if (!caps)
        goto end;

    /**
     * If we should open the device with the default format,
     * then:
     * 1. check what the format of the default device is, and
     * 2. below we iterate all formats till we find a matching
     *    one, with most info exposed (see comment below).
     */
    use_default = !dshow_should_set_format(avctx, devtype);
    if (use_default && pformat_set)
    {
        // get default
        dshow_get_default_format(pin, config, devtype, &type);
        if (!type)
            // this pin does not expose any formats of the expected type
            goto end;

        if (type) {
            // interrogate default format, so we know what to search for below
            struct dshow_format_info *fmt_info = dshow_get_format_info(type);
            if (fmt_info) {
                if (fmt_info->devtype == VideoDevice) {
                    requested_video_codec_id = fmt_info->codec_id;
                    requested_pixel_format   = fmt_info->pix_fmt;
                    requested_framerate      = fmt_info->framerate;
                    requested_width          = fmt_info->width;
                    requested_height         = fmt_info->height;
                } else {
                    requested_sample_rate = fmt_info->sample_rate;
                    requested_sample_size = fmt_info->sample_size;
                    requested_channels    = fmt_info->channels;
                }
                av_free(fmt_info);  // free but don't set to NULL to enable below check
            }

            if (type && type->pbFormat)
                CoTaskMemFree(type->pbFormat);
            CoTaskMemFree(type);
            type = NULL;
            if (!fmt_info)
                // default format somehow invalid, can't continue with this pin
                goto end;
            fmt_info = NULL;
        }
    }

    // NB: some devices (e.g. Logitech C920) expose each video format twice:
    // both a format containing a VIDEOINFOHEADER and a format containing
    // a VIDEOINFOHEADER2. We want, if possible, to select a format with a
    // VIDEOINFOHEADER2, as this potentially provides more info about the
    // format. So, if in the iteration below we have found a matching format,
    // but it is a VIDEOINFOHEADER, keep looking for a matching format that
    // exposes contains a VIDEOINFOHEADER2. Fall back to the VIDEOINFOHEADER
    // format if no corresponding VIDEOINFOHEADER2 is found when we finish
    // iterating.
    for (i = 0; i < n && !format_set; i++) {
        struct dshow_format_info *fmt_info = NULL;
        r = IAMStreamConfig_GetStreamCaps(config, i, &type, (void *) caps);
        if (r != S_OK)
            goto next;
#if DSHOWDEBUG
        ff_print_AM_MEDIA_TYPE(type);
#endif

        fmt_info = dshow_get_format_info(type);
        if (!fmt_info)
            goto next;

        if (devtype == VideoDevice) {
            VIDEO_STREAM_CONFIG_CAPS *vcaps = caps;
            BITMAPINFOHEADER *bih = NULL;
            int64_t *fr = NULL;
#if DSHOWDEBUG
            ff_print_VIDEO_STREAM_CONFIG_CAPS(vcaps);
#endif

            if (fmt_info->devtype != VideoDevice)
                goto next;

            if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
                VIDEOINFOHEADER *v = (void *) type->pbFormat;
                fr  = &v->AvgTimePerFrame;
                bih = &v->bmiHeader;
                wait_for_better = 1;
            } else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
                VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
                fr  = &v->AvgTimePerFrame;
                bih = &v->bmiHeader;
                wait_for_better = 0;
            }

            if (!pformat_set) {
                const char *chroma = av_chroma_location_name(fmt_info->chroma_loc);
                if (fmt_info->pix_fmt == AV_PIX_FMT_NONE) {
                    const AVCodec *codec = avcodec_find_decoder(fmt_info->codec_id);
                    if (fmt_info->codec_id == AV_CODEC_ID_NONE || !codec) {
                        av_log(avctx, AV_LOG_INFO, "  unknown compression type 0x%X", (int) bih->biCompression);
                    } else {
                        av_log(avctx, AV_LOG_INFO, "  vcodec=%s", codec->name);
                    }
                } else {
                    av_log(avctx, AV_LOG_INFO, "  pixel_format=%s", av_get_pix_fmt_name(fmt_info->pix_fmt));
                }
                av_log(avctx, AV_LOG_INFO, "  min s=%ldx%ld fps=%g max s=%ldx%ld fps=%g",
                       vcaps->MinOutputSize.cx, vcaps->MinOutputSize.cy,
                       1e7 / vcaps->MaxFrameInterval,
                       vcaps->MaxOutputSize.cx, vcaps->MaxOutputSize.cy,
                       1e7 / vcaps->MinFrameInterval);

                if (fmt_info->col_range != AVCOL_RANGE_UNSPECIFIED ||
                    fmt_info->col_space != AVCOL_SPC_UNSPECIFIED ||
                    fmt_info->col_prim != AVCOL_PRI_UNSPECIFIED ||
                    fmt_info->col_trc != AVCOL_TRC_UNSPECIFIED) {
                    const char *range = av_color_range_name(fmt_info->col_range);
                    const char *space = av_color_space_name(fmt_info->col_space);
                    const char *prim = av_color_primaries_name(fmt_info->col_prim);
                    const char *trc = av_color_transfer_name(fmt_info->col_trc);
                    av_log(avctx, AV_LOG_INFO, " (%s, %s/%s/%s",
                        range ? range : "unknown",
                        space ? space : "unknown",
                        prim  ? prim  : "unknown",
                        trc   ? trc   : "unknown");
                    if (fmt_info->chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
                        av_log(avctx, AV_LOG_INFO, ", %s", chroma ? chroma : "unknown");
                    av_log(avctx, AV_LOG_INFO, ")");
                }
                else if (fmt_info->chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
                    av_log(avctx, AV_LOG_INFO, "(%s)", chroma ? chroma : "unknown");

                av_log(avctx, AV_LOG_INFO, "\n");
                goto next;
            }
            if (requested_video_codec_id != AV_CODEC_ID_RAWVIDEO) {
                if (requested_video_codec_id != fmt_info->codec_id)
                    goto next;
            }
            if (requested_pixel_format != AV_PIX_FMT_NONE &&
                requested_pixel_format != fmt_info->pix_fmt) {
                goto next;
            }
            if (requested_framerate) {
                if (requested_framerate > vcaps->MaxFrameInterval ||
                    requested_framerate < vcaps->MinFrameInterval)
                    goto next;
                *fr = requested_framerate;
            }
            if (requested_width && requested_height) {
                if (requested_width  > vcaps->MaxOutputSize.cx ||
                    requested_width  < vcaps->MinOutputSize.cx ||
                    requested_height > vcaps->MaxOutputSize.cy ||
                    requested_height < vcaps->MinOutputSize.cy)
                    goto next;
                bih->biWidth  = requested_width;
                bih->biHeight = requested_height;
            }
        } else {
            WAVEFORMATEX *fx;
#if DSHOWDEBUG
            AUDIO_STREAM_CONFIG_CAPS *acaps = caps;
            ff_print_AUDIO_STREAM_CONFIG_CAPS(acaps);
#endif
            if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
                fx = (void *) type->pbFormat;
            } else {
                goto next;
            }
            if (!pformat_set) {
                av_log(
                    avctx,
                    AV_LOG_INFO,
                    "  ch=%2u, bits=%2u, rate=%6lu\n",
                    fx->nChannels, fx->wBitsPerSample, fx->nSamplesPerSec
                );
                goto next;
            }
            if (
                (requested_sample_rate && requested_sample_rate != fx->nSamplesPerSec) ||
                (requested_sample_size && requested_sample_size != fx->wBitsPerSample) ||
                (requested_channels    && requested_channels    != fx->nChannels     )
            ) {
                goto next;
            }
        }

        // found a matching format. Either apply or store
        // for safekeeping if we might maybe find a better
        // format with more info attached to it (see comment
        // above loop)
        if (!wait_for_better) {
            if (IAMStreamConfig_SetFormat(config, type) != S_OK)
                goto next;
            format_set = 1;
        }
        else if (!previous_match_type) {
            // store this matching format for possible later use.
            // If we have already found a matching format, ignore it
            previous_match_type = type;
            type = NULL;
        }
next:
        av_freep(&fmt_info);
        if (type && type->pbFormat)
            CoTaskMemFree(type->pbFormat);
        CoTaskMemFree(type);
        type = NULL;
    }

    // set the pin's format, if wanted
    if (pformat_set && !format_set) {
        if (previous_match_type) {
            // previously found a matching VIDEOINFOHEADER format and stored
            // it for safe keeping. Searching further for a matching
            // VIDEOINFOHEADER2 format yielded nothing. So set the pin's
            // format based on the VIDEOINFOHEADER format.
            // NB: this never applies to an audio format because
            // previous_match_type always NULL in that case
            if (IAMStreamConfig_SetFormat(config, previous_match_type) == S_OK)
                format_set = 1;
        }
        else if (use_default) {
            // default format returned by device apparently was not contained
            // in the capabilities of any of the formats returned by the device
            // (sic?). Fall back to directly setting the default format
            dshow_get_default_format(pin, config, devtype, &type);
            if (IAMStreamConfig_SetFormat(config, type) == S_OK)
                format_set = 1;
            if (type && type->pbFormat)
                CoTaskMemFree(type->pbFormat);
            CoTaskMemFree(type);
            type = NULL;
        }
    }

end:
    if (previous_match_type && previous_match_type->pbFormat)
        CoTaskMemFree(previous_match_type->pbFormat);
    CoTaskMemFree(previous_match_type);
    IAMStreamConfig_Release(config);
    av_free(caps);
    if (pformat_set)
        *pformat_set = format_set;
}

/**
 * Set audio device buffer size in milliseconds (which can directly impact
 * latency, depending on the device).
 */
static int
dshow_set_audio_buffer_size(AVFormatContext *avctx, IPin *pin)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    IAMBufferNegotiation *buffer_negotiation = NULL;
    ALLOCATOR_PROPERTIES props = { -1, -1, -1, -1 };
    IAMStreamConfig *config = NULL;
    AM_MEDIA_TYPE *type = NULL;
    int ret = AVERROR(EIO);

    if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
        goto end;
    if (IAMStreamConfig_GetFormat(config, &type) != S_OK)
        goto end;
    if (!IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx))
        goto end;

    props.cbBuffer = (((WAVEFORMATEX *) type->pbFormat)->nAvgBytesPerSec)
                   * ctx->audio_buffer_size / 1000;

    if (IPin_QueryInterface(pin, &IID_IAMBufferNegotiation, (void **) &buffer_negotiation) != S_OK)
        goto end;
    if (IAMBufferNegotiation_SuggestAllocatorProperties(buffer_negotiation, &props) != S_OK)
        goto end;

    ret = 0;

end:
    if (buffer_negotiation)
        IAMBufferNegotiation_Release(buffer_negotiation);
    if (type) {
        if (type->pbFormat)
            CoTaskMemFree(type->pbFormat);
        CoTaskMemFree(type);
    }
    if (config)
        IAMStreamConfig_Release(config);

    return ret;
}

/**
 * Pops up a user dialog allowing them to adjust properties for the given filter, if possible.
 */
void
ff_dshow_show_filter_properties(IBaseFilter *device_filter, AVFormatContext *avctx) {
    ISpecifyPropertyPages *property_pages = NULL;
    IUnknown *device_filter_iunknown = NULL;
    HRESULT hr;
    FILTER_INFO filter_info = {0}; /* a warning on this line is false positive GCC bug 53119 AFAICT */
    CAUUID ca_guid = {0};

    hr  = IBaseFilter_QueryInterface(device_filter, &IID_ISpecifyPropertyPages, (void **)&property_pages);
    if (hr != S_OK) {
        av_log(avctx, AV_LOG_WARNING, "requested filter does not have a property page to show");
        goto end;
    }
    hr = IBaseFilter_QueryFilterInfo(device_filter, &filter_info);
    if (hr != S_OK) {
        goto fail;
    }
    hr = IBaseFilter_QueryInterface(device_filter, &IID_IUnknown, (void **)&device_filter_iunknown);
    if (hr != S_OK) {
        goto fail;
    }
    hr = ISpecifyPropertyPages_GetPages(property_pages, &ca_guid);
    if (hr != S_OK) {
        goto fail;
    }
    hr = OleCreatePropertyFrame(NULL, 0, 0, filter_info.achName, 1, &device_filter_iunknown, ca_guid.cElems,
        ca_guid.pElems, 0, 0, NULL);
    if (hr != S_OK) {
        goto fail;
    }
    goto end;
fail:
    av_log(avctx, AV_LOG_ERROR, "Failure showing property pages for filter");
end:
    if (property_pages)
        ISpecifyPropertyPages_Release(property_pages);
    if (device_filter_iunknown)
        IUnknown_Release(device_filter_iunknown);
    if (filter_info.pGraph)
        IFilterGraph_Release(filter_info.pGraph);
    if (ca_guid.pElems)
        CoTaskMemFree(ca_guid.pElems);
}

/**
 * Cycle through available pins using the device_filter device, of type
 * devtype, retrieve the first output pin and return the pointer to the
 * object found in *ppin.
 * If ppin is NULL, cycle through all pins listing audio/video capabilities.
 */
static int
dshow_cycle_pins(AVFormatContext *avctx, enum dshowDeviceType devtype,
                 enum dshowSourceFilterType sourcetype, IBaseFilter *device_filter, IPin **ppin)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    IEnumPins *pins = 0;
    IPin *device_pin = NULL;
    IPin *pin;
    int r;

    const char *devtypename = (devtype == VideoDevice) ? "video" : "audio only";
    const char *sourcetypename = (sourcetype == VideoSourceDevice) ? "video" : "audio";

    int set_format = dshow_should_set_format(avctx, devtype);
    int format_set = 0;
    int should_show_properties = (devtype == VideoDevice) ? ctx->show_video_device_dialog : ctx->show_audio_device_dialog;

    if (should_show_properties)
        ff_dshow_show_filter_properties(device_filter, avctx);

    r = IBaseFilter_EnumPins(device_filter, &pins);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not enumerate pins.\n");
        return AVERROR(EIO);
    }

    if (!ppin) {
        av_log(avctx, AV_LOG_INFO, "DirectShow %s device options (from %s devices)\n",
               devtypename, sourcetypename);
    }

    while (!device_pin && IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
        IKsPropertySet *p = NULL;
        PIN_INFO info = {0};
        GUID category;
        DWORD r2;
        char *name_buf = NULL;
        wchar_t *pin_id = NULL;
        char *pin_buf = NULL;
        char *desired_pin_name = devtype == VideoDevice ? ctx->video_pin_name : ctx->audio_pin_name;

        IPin_QueryPinInfo(pin, &info);
        IBaseFilter_Release(info.pFilter);

        if (info.dir != PINDIR_OUTPUT)
            goto next;
        if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
            goto next;
        if (IKsPropertySet_Get(p, &AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
                               NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
            goto next;
        if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
            goto next;
        name_buf = dup_wchar_to_utf8(info.achName);

        r = IPin_QueryId(pin, &pin_id);
        if (r != S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not query pin id\n");
            return AVERROR(EIO);
        }
        pin_buf = dup_wchar_to_utf8(pin_id);

        if (!ppin) {
            av_log(avctx, AV_LOG_INFO, " Pin \"%s\" (alternative pin name \"%s\")\n", name_buf, pin_buf);
            dshow_cycle_formats(avctx, devtype, pin, NULL);
            goto next;
        }

        if (desired_pin_name) {
            if(strcmp(name_buf, desired_pin_name) && strcmp(pin_buf, desired_pin_name)) {
                av_log(avctx, AV_LOG_DEBUG, "skipping pin \"%s\" (\"%s\") != requested \"%s\"\n",
                    name_buf, pin_buf, desired_pin_name);
                goto next;
            }
        }

        // will either try to find format matching options supplied by user
        // or try to open default format. Successful if returns with format_set==1
        dshow_cycle_formats(avctx, devtype, pin, &format_set);
        if (!format_set) {
            goto next;
        }

        if (devtype == AudioDevice && ctx->audio_buffer_size) {
            if (dshow_set_audio_buffer_size(avctx, pin) < 0) {
                av_log(avctx, AV_LOG_ERROR, "unable to set audio buffer size %d to pin, using pin anyway...", ctx->audio_buffer_size);
            }
        }

        if (format_set) {
            device_pin = pin;
            av_log(avctx, AV_LOG_DEBUG, "Selecting pin %s on %s\n", name_buf, devtypename);
        }
next:
        if (p)
            IKsPropertySet_Release(p);
        if (device_pin != pin)
            IPin_Release(pin);
        av_free(name_buf);
        av_free(pin_buf);
        if (pin_id)
            CoTaskMemFree(pin_id);
    }

    IEnumPins_Release(pins);

    if (ppin) {
        if (set_format && !format_set) {
            av_log(avctx, AV_LOG_ERROR, "Could not set %s options\n", devtypename);
            return AVERROR(EIO);
        }
        if (!device_pin) {
            av_log(avctx, AV_LOG_ERROR,
                "Could not find output pin from %s capture device.\n", devtypename);
            return AVERROR(EIO);
        }
        *ppin = device_pin;
    }

    return 0;
}

/**
 * List options for device with type devtype, source filter type sourcetype
 *
 * @param devenum device enumerator used for accessing the device
 */
static int
dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
                          enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    IBaseFilter *device_filter = NULL;
    char *device_unique_name = NULL;
    int r;

    if ((r = dshow_cycle_devices(avctx, devenum, devtype, sourcetype, &device_filter, &device_unique_name, NULL)) < 0)
        return r;
    ctx->device_filter[devtype] = device_filter;
    ctx->device_unique_name[devtype] = device_unique_name;
    if ((r = dshow_cycle_pins(avctx, devtype, sourcetype, device_filter, NULL)) < 0)
        return r;
    return 0;
}

static int
dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
                  enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    IBaseFilter *device_filter = NULL;
    char *device_filter_unique_name = NULL;
    IGraphBuilder *graph = ctx->graph;
    IPin *device_pin = NULL;
    DShowPin *capture_pin = NULL;
    DShowFilter *capture_filter = NULL;
    ICaptureGraphBuilder2 *graph_builder2 = NULL;
    int ret = AVERROR(EIO);
    int r;
    IStream *ifile_stream = NULL;
    IStream *ofile_stream = NULL;
    IPersistStream *pers_stream = NULL;
    enum dshowDeviceType otherDevType = (devtype == VideoDevice) ? AudioDevice : VideoDevice;

    const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };


    if ( ((ctx->audio_filter_load_file) && (strlen(ctx->audio_filter_load_file)>0) && (sourcetype == AudioSourceDevice)) ||
            ((ctx->video_filter_load_file) && (strlen(ctx->video_filter_load_file)>0) && (sourcetype == VideoSourceDevice)) ) {
        HRESULT hr;
        char *filename = NULL;

        if (sourcetype == AudioSourceDevice)
            filename = ctx->audio_filter_load_file;
        else
            filename = ctx->video_filter_load_file;

        hr = SHCreateStreamOnFile ((LPCSTR) filename, STGM_READ, &ifile_stream);
        if (S_OK != hr) {
            av_log(avctx, AV_LOG_ERROR, "Could not open capture filter description file.\n");
            goto error;
        }

        hr = OleLoadFromStream(ifile_stream, &IID_IBaseFilter, (void **) &device_filter);
        if (hr != S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not load capture filter from file.\n");
            goto error;
        }

        if (sourcetype == AudioSourceDevice)
            av_log(avctx, AV_LOG_INFO, "Audio-");
        else
            av_log(avctx, AV_LOG_INFO, "Video-");
        av_log(avctx, AV_LOG_INFO, "Capture filter loaded successfully from file \"%s\".\n", filename);
    } else {

        if ((r = dshow_cycle_devices(avctx, devenum, devtype, sourcetype, &device_filter, &device_filter_unique_name, NULL)) < 0) {
            ret = r;
            goto error;
        }
    }
    if (ctx->device_filter[otherDevType]) {
        // avoid adding add two instances of the same device to the graph, one for video, one for audio
        // a few devices don't support this (could also do this check earlier to avoid double crossbars, etc. but they seem OK)
        if (!device_filter_unique_name || strcmp(device_filter_unique_name, ctx->device_unique_name[otherDevType]) == 0) {
          av_log(avctx, AV_LOG_DEBUG, "reusing previous graph capture filter... %s\n", device_filter_unique_name);
          IBaseFilter_Release(device_filter);
          device_filter = ctx->device_filter[otherDevType];
          IBaseFilter_AddRef(ctx->device_filter[otherDevType]);
        } else {
            av_log(avctx, AV_LOG_DEBUG, "not reusing previous graph capture filter %s != %s\n", device_filter_unique_name, ctx->device_unique_name[otherDevType]);
        }
    }

    ctx->device_filter [devtype] = device_filter;
    ctx->device_unique_name [devtype] = device_filter_unique_name;

    r = IGraphBuilder_AddFilter(graph, device_filter, NULL);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not add device filter to graph.\n");
        goto error;
    }

    if ((r = dshow_cycle_pins(avctx, devtype, sourcetype, device_filter, &device_pin)) < 0) {
        ret = r;
        goto error;
    }

    ctx->device_pin[devtype] = device_pin;

    capture_filter = ff_dshow_filter_Create(avctx, callback, devtype);
    if (!capture_filter) {
        av_log(avctx, AV_LOG_ERROR, "Could not create grabber filter.\n");
        goto error;
    }
    ctx->capture_filter[devtype] = capture_filter;

    if ( ((ctx->audio_filter_save_file) && (strlen(ctx->audio_filter_save_file)>0) && (sourcetype == AudioSourceDevice)) ||
            ((ctx->video_filter_save_file) && (strlen(ctx->video_filter_save_file)>0) && (sourcetype == VideoSourceDevice)) ) {

        HRESULT hr;
        char *filename = NULL;

        if (sourcetype == AudioSourceDevice)
            filename = ctx->audio_filter_save_file;
        else
            filename = ctx->video_filter_save_file;

        hr = SHCreateStreamOnFile ((LPCSTR) filename, STGM_CREATE | STGM_READWRITE, &ofile_stream);
        if (S_OK != hr) {
            av_log(avctx, AV_LOG_ERROR, "Could not create capture filter description file.\n");
            goto error;
        }

        hr  = IBaseFilter_QueryInterface(device_filter, &IID_IPersistStream, (void **) &pers_stream);
        if (hr != S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Query for IPersistStream failed.\n");
            goto error;
        }

        hr = OleSaveToStream(pers_stream, ofile_stream);
        if (hr != S_OK) {
            av_log(avctx, AV_LOG_ERROR, "Could not save capture filter \n");
            goto error;
        }

        hr = IStream_Commit(ofile_stream, STGC_DEFAULT);
        if (S_OK != hr) {
            av_log(avctx, AV_LOG_ERROR, "Could not commit capture filter data to file.\n");
            goto error;
        }

        if (sourcetype == AudioSourceDevice)
            av_log(avctx, AV_LOG_INFO, "Audio-");
        else
            av_log(avctx, AV_LOG_INFO, "Video-");
        av_log(avctx, AV_LOG_INFO, "Capture filter saved successfully to file \"%s\".\n", filename);
    }

    r = IGraphBuilder_AddFilter(graph, (IBaseFilter *) capture_filter,
                                filter_name[devtype]);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not add capture filter to graph\n");
        goto error;
    }

    ff_dshow_pin_AddRef(capture_filter->pin);
    capture_pin = capture_filter->pin;
    ctx->capture_pin[devtype] = capture_pin;

    r = CoCreateInstance(&CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER,
                         &IID_ICaptureGraphBuilder2, (void **) &graph_builder2);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not create CaptureGraphBuilder2\n");
        goto error;
    }
    r = ICaptureGraphBuilder2_SetFiltergraph(graph_builder2, graph);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not set graph for CaptureGraphBuilder2\n");
        goto error;
    }

    r = ICaptureGraphBuilder2_RenderStream(graph_builder2, NULL, NULL, (IUnknown *) device_pin, NULL /* no intermediate filter */,
        (IBaseFilter *) capture_filter); /* connect pins, optionally insert intermediate filters like crossbar if necessary */

    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not RenderStream to connect pins\n");
        goto error;
    }

    r = ff_dshow_try_setup_crossbar_options(graph_builder2, device_filter, devtype, avctx);

    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not setup CrossBar\n");
        goto error;
    }

    ret = 0;

error:
    if (graph_builder2 != NULL)
        ICaptureGraphBuilder2_Release(graph_builder2);

    if (pers_stream)
        IPersistStream_Release(pers_stream);

    if (ifile_stream)
        IStream_Release(ifile_stream);

    if (ofile_stream)
        IStream_Release(ofile_stream);

    return ret;
}

static enum AVCodecID waveform_codec_id(enum AVSampleFormat sample_fmt)
{
    switch (sample_fmt) {
    case AV_SAMPLE_FMT_U8:  return AV_CODEC_ID_PCM_U8;
    case AV_SAMPLE_FMT_S16: return AV_CODEC_ID_PCM_S16LE;
    case AV_SAMPLE_FMT_S32: return AV_CODEC_ID_PCM_S32LE;
    default:                return AV_CODEC_ID_NONE; /* Should never happen. */
    }
}

static enum AVSampleFormat sample_fmt_bits_per_sample(int bits)
{
    switch (bits) {
    case 8:  return AV_SAMPLE_FMT_U8;
    case 16: return AV_SAMPLE_FMT_S16;
    case 32: return AV_SAMPLE_FMT_S32;
    default: return AV_SAMPLE_FMT_NONE; /* Should never happen. */
    }
}

static int
dshow_add_device(AVFormatContext *avctx,
                 enum dshowDeviceType devtype)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    AM_MEDIA_TYPE type;
    AVCodecParameters *par;
    AVStream *st;
    struct dshow_format_info *fmt_info = NULL;
    int ret = AVERROR(EIO);

    type.pbFormat = NULL;

    st = avformat_new_stream(avctx, NULL);
    if (!st) {
        ret = AVERROR(ENOMEM);
        goto error;
    }
    st->id = devtype;

    ctx->capture_filter[devtype]->stream_index = st->index;

    if (ff_dshow_pin_ConnectionMediaType(ctx->capture_pin[devtype], &type) != S_OK) {
        ret = AVERROR(EIO);
        goto error;
    }
    fmt_info = dshow_get_format_info(&type);
    if (!fmt_info) {
        ret = AVERROR(EIO);
        goto error;
    }

    par = st->codecpar;
    if (devtype == VideoDevice) {
        BITMAPINFOHEADER *bih = NULL;
        AVRational time_base;

        if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo)) {
            VIDEOINFOHEADER *v = (void *) type.pbFormat;
            time_base = (AVRational) { v->AvgTimePerFrame, 10000000 };
            bih = &v->bmiHeader;
        } else if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo2)) {
            VIDEOINFOHEADER2 *v = (void *) type.pbFormat;
            time_base = (AVRational) { v->AvgTimePerFrame, 10000000 };
            bih = &v->bmiHeader;
        }
        if (!bih) {
            av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
            goto error;
        }

        st->avg_frame_rate = av_inv_q(time_base);
        st->r_frame_rate = av_inv_q(time_base);

        par->codec_type = AVMEDIA_TYPE_VIDEO;
        par->width      = fmt_info->width;
        par->height     = fmt_info->height;
        par->codec_tag  = bih->biCompression;
        par->format     = fmt_info->pix_fmt;
        if (bih->biCompression == MKTAG('H', 'D', 'Y', 'C')) {
            av_log(avctx, AV_LOG_DEBUG, "attempt to use full range for HDYC...\n");
            par->color_range = AVCOL_RANGE_MPEG; // just in case it needs this...
        }
        par->color_range = fmt_info->col_range;
        par->color_space = fmt_info->col_space;
        par->color_primaries = fmt_info->col_prim;
        par->color_trc = fmt_info->col_trc;
        par->chroma_location = fmt_info->chroma_loc;
        par->codec_id = fmt_info->codec_id;
        if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
            if (bih->biCompression == BI_RGB || bih->biCompression == BI_BITFIELDS) {
                par->bits_per_coded_sample = bih->biBitCount;
                if (par->height < 0) {
                    par->height *= -1;
                } else {
                    par->extradata = av_malloc(9 + AV_INPUT_BUFFER_PADDING_SIZE);
                    if (par->extradata) {
                        par->extradata_size = 9;
                        memcpy(par->extradata, "BottomUp", 9);
                    }
                }
            }
        } else {
            if (par->codec_id == AV_CODEC_ID_NONE) {
                av_log(avctx, AV_LOG_ERROR, "Unknown compression type. "
                                 "Please report type 0x%X.\n", (int) bih->biCompression);
                ret = AVERROR_PATCHWELCOME;
                goto error;
            }
            par->bits_per_coded_sample = bih->biBitCount;
        }
    } else {
        if (!IsEqualGUID(&type.formattype, &FORMAT_WaveFormatEx)) {
            av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
            goto error;
        }

        par->codec_type  = AVMEDIA_TYPE_AUDIO;
        par->format      = sample_fmt_bits_per_sample(fmt_info->sample_size);
        par->codec_id    = waveform_codec_id(par->format);
        par->sample_rate = fmt_info->sample_rate;
        par->ch_layout.nb_channels = fmt_info->channels;
    }

    avpriv_set_pts_info(st, 64, 1, 10000000);

    ret = 0;

error:
    av_freep(&fmt_info);
    if (type.pbFormat)
        CoTaskMemFree(type.pbFormat);
    return ret;
}

static int parse_device_name(AVFormatContext *avctx)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    char **device_name = ctx->device_name;
    char *name = av_strdup(avctx->url);
    char *tmp = name;
    int ret = 1;
    char *type;

    while ((type = strtok(tmp, "="))) {
        char *token = strtok(NULL, ":");
        tmp = NULL;

        if        (!strcmp(type, "video")) {
            device_name[0] = token;
        } else if (!strcmp(type, "audio")) {
            device_name[1] = token;
        } else {
            device_name[0] = NULL;
            device_name[1] = NULL;
            break;
        }
    }

    if (!device_name[0] && !device_name[1]) {
        ret = 0;
    } else {
        if (device_name[0])
            device_name[0] = av_strdup(device_name[0]);
        if (device_name[1])
            device_name[1] = av_strdup(device_name[1]);
    }

    av_free(name);
    return ret;
}

static int dshow_read_header(AVFormatContext *avctx)
{
    struct dshow_ctx *ctx = avctx->priv_data;
    IGraphBuilder *graph = NULL;
    ICreateDevEnum *devenum = NULL;
    IMediaControl *control = NULL;
    IMediaEvent *media_event = NULL;
    HANDLE media_event_handle;
    HANDLE proc;
    int ret = AVERROR(EIO);
    int r;

    CoInitialize(0);

    if (!ctx->list_devices && !parse_device_name(avctx)) {
        av_log(avctx, AV_LOG_ERROR, "Malformed dshow input string.\n");
        goto error;
    }

    ctx->video_codec_id = avctx->video_codec_id ? avctx->video_codec_id
                                                : AV_CODEC_ID_RAWVIDEO;
    if (ctx->pixel_format != AV_PIX_FMT_NONE) {
        if (ctx->video_codec_id != AV_CODEC_ID_RAWVIDEO) {
            av_log(avctx, AV_LOG_ERROR, "Pixel format may only be set when "
                              "video codec is not set or set to rawvideo\n");
            ret = AVERROR(EINVAL);
            goto error;
        }
    }
    if (ctx->framerate) {
        r = av_parse_video_rate(&ctx->requested_framerate, ctx->framerate);
        if (r < 0) {
            av_log(avctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
            goto error;
        }
    }

    r = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
                         &IID_IGraphBuilder, (void **) &graph);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not create capture graph.\n");
        goto error;
    }
    ctx->graph = graph;

    r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
                         &IID_ICreateDevEnum, (void **) &devenum);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
        goto error;
    }

    if (ctx->list_devices) {
        dshow_cycle_devices(avctx, devenum, VideoDevice, VideoSourceDevice, NULL, NULL, NULL);
        dshow_cycle_devices(avctx, devenum, AudioDevice, AudioSourceDevice, NULL, NULL, NULL);
        ret = AVERROR_EXIT;
        goto error;
    }
    if (ctx->list_options) {
        if (ctx->device_name[VideoDevice])
            if ((r = dshow_list_device_options(avctx, devenum, VideoDevice, VideoSourceDevice))) {
                ret = r;
                goto error;
            }
        if (ctx->device_name[AudioDevice]) {
            if (dshow_list_device_options(avctx, devenum, AudioDevice, AudioSourceDevice)) {
                /* show audio options from combined video+audio sources as fallback */
                if ((r = dshow_list_device_options(avctx, devenum, AudioDevice, VideoSourceDevice))) {
                    ret = r;
                    goto error;
                }
            }
        }
        // don't exit yet, allow it to list crossbar options in dshow_open_device
    }
    if (ctx->device_name[VideoDevice]) {
        if ((r = dshow_open_device(avctx, devenum, VideoDevice, VideoSourceDevice)) < 0 ||
            (r = dshow_add_device(avctx, VideoDevice)) < 0) {
            ret = r;
            goto error;
        }
    }
    if (ctx->device_name[AudioDevice]) {
        if ((r = dshow_open_device(avctx, devenum, AudioDevice, AudioSourceDevice)) < 0 ||
            (r = dshow_add_device(avctx, AudioDevice)) < 0) {
            av_log(avctx, AV_LOG_INFO, "Searching for audio device within video devices for %s\n", ctx->device_name[AudioDevice]);
            /* see if there's a video source with an audio pin with the given audio name */
            if ((r = dshow_open_device(avctx, devenum, AudioDevice, VideoSourceDevice)) < 0 ||
                (r = dshow_add_device(avctx, AudioDevice)) < 0) {
                ret = r;
                goto error;
            }
        }
    }
    if (ctx->list_options) {
        /* allow it to list crossbar options in dshow_open_device */
        ret = AVERROR_EXIT;
        goto error;
    }
    ctx->curbufsize[0] = 0;
    ctx->curbufsize[1] = 0;
    ctx->mutex = CreateMutex(NULL, 0, NULL);
    if (!ctx->mutex) {
        av_log(avctx, AV_LOG_ERROR, "Could not create Mutex\n");
        goto error;
    }
    ctx->event[1] = CreateEvent(NULL, 1, 0, NULL);
    if (!ctx->event[1]) {
        av_log(avctx, AV_LOG_ERROR, "Could not create Event\n");
        goto error;
    }

    r = IGraphBuilder_QueryInterface(graph, &IID_IMediaControl, (void **) &control);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not get media control.\n");
        goto error;
    }
    ctx->control = control;

    r = IGraphBuilder_QueryInterface(graph, &IID_IMediaEvent, (void **) &media_event);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not get media event.\n");
        goto error;
    }
    ctx->media_event = media_event;

    r = IMediaEvent_GetEventHandle(media_event, (void *) &media_event_handle);
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not get media event handle.\n");
        goto error;
    }
    proc = GetCurrentProcess();
    r = DuplicateHandle(proc, media_event_handle, proc, &ctx->event[0],
                        0, 0, DUPLICATE_SAME_ACCESS);
    if (!r) {
        av_log(avctx, AV_LOG_ERROR, "Could not duplicate media event handle.\n");
        goto error;
    }

    r = IMediaControl_Run(control);
    if (r == S_FALSE) {
        OAFilterState pfs;
        r = IMediaControl_GetState(control, 0, &pfs);
    }
    if (r != S_OK) {
        av_log(avctx, AV_LOG_ERROR, "Could not run graph (sometimes caused by a device already in use by other application)\n");
        goto error;
    }

    ret = 0;

error:

    if (devenum)
        ICreateDevEnum_Release(devenum);

    if (ret < 0)
        dshow_read_close(avctx);

    return ret;
}

/**
 * Checks media events from DirectShow and returns -1 on error or EOF. Also
 * purges all events that might be in the event queue to stop the trigger
 * of event notification.
 */
static int dshow_check_event_queue(IMediaEvent *media_event)
{
    LONG_PTR p1, p2;
    long code;
    int ret = 0;

    while (IMediaEvent_GetEvent(media_event, &code, &p1, &p2, 0) != E_ABORT) {
        if (code == EC_COMPLETE || code == EC_DEVICE_LOST || code == EC_ERRORABORT)
            ret = -1;
        IMediaEvent_FreeEventParams(media_event, code, p1, p2);
    }

    return ret;
}

static int dshow_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    struct dshow_ctx *ctx = s->priv_data;
    PacketListEntry *pktl = NULL;

    while (!ctx->eof && !pktl) {
        WaitForSingleObject(ctx->mutex, INFINITE);
        pktl = ctx->pktl;
        if (pktl) {
            *pkt = pktl->pkt;
            ctx->pktl = ctx->pktl->next;
            av_free(pktl);
            ctx->curbufsize[pkt->stream_index] -= pkt->size;
        }
        ResetEvent(ctx->event[1]);
        ReleaseMutex(ctx->mutex);
        if (!pktl) {
            if (dshow_check_event_queue(ctx->media_event) < 0) {
                ctx->eof = 1;
            } else if (s->flags & AVFMT_FLAG_NONBLOCK) {
                return AVERROR(EAGAIN);
            } else {
                WaitForMultipleObjects(2, ctx->event, 0, INFINITE);
            }
        }
    }

    return ctx->eof ? AVERROR(EIO) : pkt->size;
}

#define OFFSET(x) offsetof(struct dshow_ctx, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
    { "video_size", "set video size given a string such as 640x480 or hd720.", OFFSET(requested_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
    { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_NONE}, -1, INT_MAX, DEC },
    { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "sample_rate", "set audio sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 16, DEC },
    { "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "audio_buffer_size", "set audio device buffer latency size in milliseconds (default is the device's default)", OFFSET(audio_buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "list_devices", "list available devices",                      OFFSET(list_devices), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
    { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
    { "video_device_number", "set video device number for devices with same name (starts at 0)", OFFSET(video_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "audio_device_number", "set audio device number for devices with same name (starts at 0)", OFFSET(audio_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "video_pin_name", "select video capture pin by name", OFFSET(video_pin_name),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0, AV_OPT_FLAG_ENCODING_PARAM },
    { "audio_pin_name", "select audio capture pin by name", OFFSET(audio_pin_name),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0, AV_OPT_FLAG_ENCODING_PARAM },
    { "crossbar_video_input_pin_number", "set video input pin number for crossbar device", OFFSET(crossbar_video_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
    { "crossbar_audio_input_pin_number", "set audio input pin number for crossbar device", OFFSET(crossbar_audio_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
    { "show_video_device_dialog",              "display property dialog for video capture device",                            OFFSET(show_video_device_dialog),              AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_audio_device_dialog",              "display property dialog for audio capture device",                            OFFSET(show_audio_device_dialog),              AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_video_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on video device", OFFSET(show_video_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_audio_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on audio device", OFFSET(show_audio_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_analog_tv_tuner_dialog",           "display property dialog for analog tuner filter",                             OFFSET(show_analog_tv_tuner_dialog),           AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_analog_tv_tuner_audio_dialog",     "display property dialog for analog tuner audio filter",                       OFFSET(show_analog_tv_tuner_audio_dialog),     AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "audio_device_load", "load audio capture filter device (and properties) from file", OFFSET(audio_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "audio_device_save", "save audio capture filter device (and properties) to file", OFFSET(audio_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "video_device_load", "load video capture filter device (and properties) from file", OFFSET(video_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "video_device_save", "save video capture filter device (and properties) to file", OFFSET(video_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "use_video_device_timestamps", "use device instead of wallclock timestamps for video frames", OFFSET(use_video_device_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, DEC },
    { NULL },
};

static const AVClass dshow_class = {
    .class_name = "dshow indev",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
};

const FFInputFormat ff_dshow_demuxer = {
    .p.name         = "dshow",
    .p.long_name    = NULL_IF_CONFIG_SMALL("DirectShow capture"),
    .p.flags        = AVFMT_NOFILE | AVFMT_NOBINSEARCH |
                      AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
    .p.priv_class   = &dshow_class,
    .priv_data_size = sizeof(struct dshow_ctx),
    .read_header    = dshow_read_header,
    .read_packet    = dshow_read_packet,
    .read_close     = dshow_read_close,
    .get_device_list= dshow_get_device_list,
};