aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/DocBook/media/v4l/controls.xml
blob: c2fc9ec1417ea43762f18c7d71c74ce7b71d8771 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
  <section id="control">
    <title>User Controls</title>

    <para>Devices typically have a number of user-settable controls
such as brightness, saturation and so on, which would be presented to
the user on a graphical user interface. But, different devices
will have different controls available, and furthermore, the range of
possible values, and the default value will vary from device to
device. The control ioctls provide the information and a mechanism to
create a nice user interface for these controls that will work
correctly with any device.</para>

    <para>All controls are accessed using an ID value. V4L2 defines
several IDs for specific purposes. Drivers can also implement their
own custom controls using <constant>V4L2_CID_PRIVATE_BASE</constant>
and higher values. The pre-defined control IDs have the prefix
<constant>V4L2_CID_</constant>, and are listed in <xref
linkend="control-id" />. The ID is used when querying the attributes of
a control, and when getting or setting the current value.</para>

    <para>Generally applications should present controls to the user
without assumptions about their purpose. Each control comes with a
name string the user is supposed to understand. When the purpose is
non-intuitive the driver writer should provide a user manual, a user
interface plug-in or a driver specific panel application. Predefined
IDs were introduced to change a few controls programmatically, for
example to mute a device during a channel switch.</para>

    <para>Drivers may enumerate different controls after switching
the current video input or output, tuner or modulator, or audio input
or output. Different in the sense of other bounds, another default and
current value, step size or other menu items. A control with a certain
<emphasis>custom</emphasis> ID can also change name and
type.<footnote>
	<para>It will be more convenient for applications if drivers
make use of the <constant>V4L2_CTRL_FLAG_DISABLED</constant> flag, but
that was never required.</para>
      </footnote> Control values are stored globally, they do not
change when switching except to stay within the reported bounds. They
also do not change &eg; when the device is opened or closed, when the
tuner radio frequency is changed or generally never without
application request. Since V4L2 specifies no event mechanism, panel
applications intended to cooperate with other panel applications (be
they built into a larger application, as a TV viewer) may need to
regularly poll control values to update their user
interface.<footnote>
	<para>Applications could call an ioctl to request events.
After another process called &VIDIOC-S-CTRL; or another ioctl changing
shared properties the &func-select; function would indicate
readability until any ioctl (querying the properties) is
called.</para>
      </footnote></para>

    <para>
      All controls use machine endianness.
    </para>

    <table pgwide="1" frame="none" id="control-id">
      <title>Control IDs</title>
      <tgroup cols="3">
	&cs-def;
	<thead>
	  <row>
	    <entry>ID</entry>
	    <entry>Type</entry>
	    <entry>Description</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row>
	    <entry><constant>V4L2_CID_BASE</constant></entry>
	    <entry></entry>
	    <entry>First predefined ID, equal to
<constant>V4L2_CID_BRIGHTNESS</constant>.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_USER_BASE</constant></entry>
	    <entry></entry>
	    <entry>Synonym of <constant>V4L2_CID_BASE</constant>.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_BRIGHTNESS</constant></entry>
	    <entry>integer</entry>
	    <entry>Picture brightness, or more precisely, the black
level.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_CONTRAST</constant></entry>
	    <entry>integer</entry>
	    <entry>Picture contrast or luma gain.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_SATURATION</constant></entry>
	    <entry>integer</entry>
	    <entry>Picture color saturation or chroma gain.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_HUE</constant></entry>
	    <entry>integer</entry>
	    <entry>Hue or color balance.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUDIO_VOLUME</constant></entry>
	    <entry>integer</entry>
	    <entry>Overall audio volume. Note some drivers also
provide an OSS or ALSA mixer interface.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUDIO_BALANCE</constant></entry>
	    <entry>integer</entry>
	    <entry>Audio stereo balance. Minimum corresponds to all
the way left, maximum to right.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUDIO_BASS</constant></entry>
	    <entry>integer</entry>
	    <entry>Audio bass adjustment.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUDIO_TREBLE</constant></entry>
	    <entry>integer</entry>
	    <entry>Audio treble adjustment.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUDIO_MUTE</constant></entry>
	    <entry>boolean</entry>
	    <entry>Mute audio, &ie; set the volume to zero, however
without affecting <constant>V4L2_CID_AUDIO_VOLUME</constant>. Like
ALSA drivers, V4L2 drivers must mute at load time to avoid excessive
noise. Actually the entire device should be reset to a low power
consumption state.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUDIO_LOUDNESS</constant></entry>
	    <entry>boolean</entry>
	    <entry>Loudness mode (bass boost).</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_BLACK_LEVEL</constant></entry>
	    <entry>integer</entry>
	    <entry>Another name for brightness (not a synonym of
<constant>V4L2_CID_BRIGHTNESS</constant>). This control is deprecated
and should not be used in new drivers and applications.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUTO_WHITE_BALANCE</constant></entry>
	    <entry>boolean</entry>
	    <entry>Automatic white balance (cameras).</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_DO_WHITE_BALANCE</constant></entry>
	    <entry>button</entry>
	    <entry>This is an action control. When set (the value is
ignored), the device will do a white balance and then hold the current
setting. Contrast this with the boolean
<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant>, which, when
activated, keeps adjusting the white balance.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_RED_BALANCE</constant></entry>
	    <entry>integer</entry>
	    <entry>Red chroma balance.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_BLUE_BALANCE</constant></entry>
	    <entry>integer</entry>
	    <entry>Blue chroma balance.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_GAMMA</constant></entry>
	    <entry>integer</entry>
	    <entry>Gamma adjust.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_WHITENESS</constant></entry>
	    <entry>integer</entry>
	    <entry>Whiteness for grey-scale devices. This is a synonym
for <constant>V4L2_CID_GAMMA</constant>. This control is deprecated
and should not be used in new drivers and applications.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_EXPOSURE</constant></entry>
	    <entry>integer</entry>
	    <entry>Exposure (cameras). [Unit?]</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUTOGAIN</constant></entry>
	    <entry>boolean</entry>
	    <entry>Automatic gain/exposure control.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_GAIN</constant></entry>
	    <entry>integer</entry>
	    <entry>Gain control.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_HFLIP</constant></entry>
	    <entry>boolean</entry>
	    <entry>Mirror the picture horizontally.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_VFLIP</constant></entry>
	    <entry>boolean</entry>
	    <entry>Mirror the picture vertically.</entry>
	  </row>
	  <row id="v4l2-power-line-frequency">
	    <entry><constant>V4L2_CID_POWER_LINE_FREQUENCY</constant></entry>
	    <entry>enum</entry>
	    <entry>Enables a power line frequency filter to avoid
flicker. Possible values for <constant>enum v4l2_power_line_frequency</constant> are:
<constant>V4L2_CID_POWER_LINE_FREQUENCY_DISABLED</constant> (0),
<constant>V4L2_CID_POWER_LINE_FREQUENCY_50HZ</constant> (1),
<constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2) and
<constant>V4L2_CID_POWER_LINE_FREQUENCY_AUTO</constant> (3).</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_HUE_AUTO</constant></entry>
	    <entry>boolean</entry>
	    <entry>Enables automatic hue control by the device. The
effect of setting <constant>V4L2_CID_HUE</constant> while automatic
hue control is enabled is undefined, drivers should ignore such
request.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_WHITE_BALANCE_TEMPERATURE</constant></entry>
	    <entry>integer</entry>
	    <entry>This control specifies the white balance settings
as a color temperature in Kelvin. A driver should have a minimum of
2800 (incandescent) to 6500 (daylight). For more information about
color temperature see <ulink
url="http://en.wikipedia.org/wiki/Color_temperature">Wikipedia</ulink>.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_SHARPNESS</constant></entry>
	    <entry>integer</entry>
	    <entry>Adjusts the sharpness filters in a camera. The
minimum value disables the filters, higher values give a sharper
picture.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_BACKLIGHT_COMPENSATION</constant></entry>
	    <entry>integer</entry>
	    <entry>Adjusts the backlight compensation in a camera. The
minimum value disables backlight compensation.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_CHROMA_AGC</constant></entry>
	    <entry>boolean</entry>
	    <entry>Chroma automatic gain control.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_CHROMA_GAIN</constant></entry>
	    <entry>integer</entry>
	    <entry>Adjusts the Chroma gain control (for use when chroma AGC
	    is disabled).</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_COLOR_KILLER</constant></entry>
	    <entry>boolean</entry>
	    <entry>Enable the color killer (&ie; force a black &amp; white image in case of a weak video signal).</entry>
	  </row>
	  <row id="v4l2-colorfx">
	    <entry><constant>V4L2_CID_COLORFX</constant></entry>
	    <entry>enum</entry>
	    <entry>Selects a color effect. The following values are defined:
	    </entry>
	  </row><row>
	  <entry></entry>
	  <entry></entry>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_COLORFX_NONE</constant>&nbsp;</entry>
		  <entry>Color effect is disabled.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_ANTIQUE</constant>&nbsp;</entry>
		  <entry>An aging (old photo) effect.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_ART_FREEZE</constant>&nbsp;</entry>
		  <entry>Frost color effect.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_AQUA</constant>&nbsp;</entry>
		  <entry>Water color, cool tone.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_BW</constant>&nbsp;</entry>
		  <entry>Black and white.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_EMBOSS</constant>&nbsp;</entry>
		  <entry>Emboss, the highlights and shadows replace light/dark boundaries
		  and low contrast areas are set to a gray background.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_GRASS_GREEN</constant>&nbsp;</entry>
		  <entry>Grass green.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_NEGATIVE</constant>&nbsp;</entry>
		  <entry>Negative.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_SEPIA</constant>&nbsp;</entry>
		  <entry>Sepia tone.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_SKETCH</constant>&nbsp;</entry>
		  <entry>Sketch.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_SKIN_WHITEN</constant>&nbsp;</entry>
		  <entry>Skin whiten.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_SKY_BLUE</constant>&nbsp;</entry>
		  <entry>Sky blue.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_SOLARIZATION</constant>&nbsp;</entry>
		  <entry>Solarization, the image is partially reversed in tone,
		  only color values above or below a certain threshold are inverted.
		  </entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_SILHOUETTE</constant>&nbsp;</entry>
		  <entry>Silhouette (outline).</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_VIVID</constant>&nbsp;</entry>
		  <entry>Vivid colors.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_COLORFX_SET_CBCR</constant>&nbsp;</entry>
		  <entry>The Cb and Cr chroma components are replaced by fixed
		  coefficients determined by <constant>V4L2_CID_COLORFX_CBCR</constant>
		  control.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_COLORFX_CBCR</constant></entry>
	    <entry>integer</entry>
	    <entry>Determines the Cb and Cr coefficients for <constant>V4L2_COLORFX_SET_CBCR</constant>
	    color effect. Bits [7:0] of the supplied 32 bit value are interpreted as
	    Cr component, bits [15:8] as Cb component and bits [31:16] must be zero.
	  </entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_AUTOBRIGHTNESS</constant></entry>
	    <entry>boolean</entry>
	    <entry>Enable Automatic Brightness.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_ROTATE</constant></entry>
	    <entry>integer</entry>
	    <entry>Rotates the image by specified angle. Common angles are 90,
	    270 and 180. Rotating the image to 90 and 270 will reverse the height
	    and width of the display window. It is necessary to set the new height and
	    width of the picture using the &VIDIOC-S-FMT; ioctl according to
	    the rotation angle selected.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_BG_COLOR</constant></entry>
	    <entry>integer</entry>
	    <entry>Sets the background color on the current output device.
	    Background color needs to be specified in the RGB24 format. The
	    supplied 32 bit value is interpreted as bits 0-7 Red color information,
	    bits 8-15 Green color information, bits 16-23 Blue color
	    information and bits 24-31 must be zero.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_ILLUMINATORS_1</constant>
		<constant>V4L2_CID_ILLUMINATORS_2</constant></entry>
	    <entry>boolean</entry>
	    <entry>Switch on or off the illuminator 1 or 2 of the device
		(usually a microscope).</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_CAPTURE</constant></entry>
	    <entry>integer</entry>
	    <entry>This is a read-only control that can be read by the application
and used as a hint to determine the number of CAPTURE buffers to pass to REQBUFS.
The value is the minimum number of CAPTURE buffers that is necessary for hardware
to work.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_OUTPUT</constant></entry>
	    <entry>integer</entry>
	    <entry>This is a read-only control that can be read by the application
and used as a hint to determine the number of OUTPUT buffers to pass to REQBUFS.
The value is the minimum number of OUTPUT buffers that is necessary for hardware
to work.</entry>
	  </row>
	  <row id="v4l2-alpha-component">
	    <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry>
	    <entry>integer</entry>
	    <entry> Sets the alpha color component on the capture device or on
	    the capture buffer queue of a mem-to-mem device. When a mem-to-mem
	    device produces frame format that includes an alpha component
	    (e.g. <link linkend="rgb-formats">packed RGB image formats</link>)
	    and the alpha value is not defined by the mem-to-mem input data
	    this control lets you select the alpha component value of all
	    pixels. It is applicable to any pixel format that contains an alpha
	    component.
	    </entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_LASTP1</constant></entry>
	    <entry></entry>
	    <entry>End of the predefined control IDs (currently
	      <constant>V4L2_CID_ALPHA_COMPONENT</constant> + 1).</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry>
	    <entry></entry>
	    <entry>ID of the first custom (driver specific) control.
Applications depending on particular custom controls should check the
driver name and version, see <xref linkend="querycap" />.</entry>
	  </row>
	</tbody>
      </tgroup>
    </table>

    <para>Applications can enumerate the available controls with the
&VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls, get and set a
control value with the &VIDIOC-G-CTRL; and &VIDIOC-S-CTRL; ioctls.
Drivers must implement <constant>VIDIOC_QUERYCTRL</constant>,
<constant>VIDIOC_G_CTRL</constant> and
<constant>VIDIOC_S_CTRL</constant> when the device has one or more
controls, <constant>VIDIOC_QUERYMENU</constant> when it has one or
more menu type controls.</para>

    <example>
      <title>Enumerating all controls</title>

      <programlisting>
&v4l2-queryctrl; queryctrl;
&v4l2-querymenu; querymenu;

static void
enumerate_menu (void)
{
	printf ("  Menu items:\n");

	memset (&amp;querymenu, 0, sizeof (querymenu));
	querymenu.id = queryctrl.id;

	for (querymenu.index = queryctrl.minimum;
	     querymenu.index &lt;= queryctrl.maximum;
	      querymenu.index++) {
		if (0 == ioctl (fd, &VIDIOC-QUERYMENU;, &amp;querymenu)) {
			printf ("  %s\n", querymenu.name);
		}
	}
}

memset (&amp;queryctrl, 0, sizeof (queryctrl));

for (queryctrl.id = V4L2_CID_BASE;
     queryctrl.id &lt; V4L2_CID_LASTP1;
     queryctrl.id++) {
	if (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
		if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
			continue;

		printf ("Control %s\n", queryctrl.name);

		if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
			enumerate_menu ();
	} else {
		if (errno == EINVAL)
			continue;

		perror ("VIDIOC_QUERYCTRL");
		exit (EXIT_FAILURE);
	}
}

for (queryctrl.id = V4L2_CID_PRIVATE_BASE;;
     queryctrl.id++) {
	if (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
		if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
			continue;

		printf ("Control %s\n", queryctrl.name);

		if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
			enumerate_menu ();
	} else {
		if (errno == EINVAL)
			break;

		perror ("VIDIOC_QUERYCTRL");
		exit (EXIT_FAILURE);
	}
}
</programlisting>
    </example>

    <example>
      <title>Changing controls</title>

      <programlisting>
&v4l2-queryctrl; queryctrl;
&v4l2-control; control;

memset (&amp;queryctrl, 0, sizeof (queryctrl));
queryctrl.id = V4L2_CID_BRIGHTNESS;

if (-1 == ioctl (fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
	if (errno != EINVAL) {
		perror ("VIDIOC_QUERYCTRL");
		exit (EXIT_FAILURE);
	} else {
		printf ("V4L2_CID_BRIGHTNESS is not supported\n");
	}
} else if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED) {
	printf ("V4L2_CID_BRIGHTNESS is not supported\n");
} else {
	memset (&amp;control, 0, sizeof (control));
	control.id = V4L2_CID_BRIGHTNESS;
	control.value = queryctrl.default_value;

	if (-1 == ioctl (fd, &VIDIOC-S-CTRL;, &amp;control)) {
		perror ("VIDIOC_S_CTRL");
		exit (EXIT_FAILURE);
	}
}

memset (&amp;control, 0, sizeof (control));
control.id = V4L2_CID_CONTRAST;

if (0 == ioctl (fd, &VIDIOC-G-CTRL;, &amp;control)) {
	control.value += 1;

	/* The driver may clamp the value or return ERANGE, ignored here */

	if (-1 == ioctl (fd, &VIDIOC-S-CTRL;, &amp;control)
	    &amp;&amp; errno != ERANGE) {
		perror ("VIDIOC_S_CTRL");
		exit (EXIT_FAILURE);
	}
/* Ignore if V4L2_CID_CONTRAST is unsupported */
} else if (errno != EINVAL) {
	perror ("VIDIOC_G_CTRL");
	exit (EXIT_FAILURE);
}

control.id = V4L2_CID_AUDIO_MUTE;
control.value = TRUE; /* silence */

/* Errors ignored */
ioctl (fd, VIDIOC_S_CTRL, &amp;control);
</programlisting>
    </example>
  </section>

  <section id="extended-controls">
    <title>Extended Controls</title>

    <section>
      <title>Introduction</title>

      <para>The control mechanism as originally designed was meant
to be used for user settings (brightness, saturation, etc). However,
it turned out to be a very useful model for implementing more
complicated driver APIs where each driver implements only a subset of
a larger API.</para>

      <para>The MPEG encoding API was the driving force behind
designing and implementing this extended control mechanism: the MPEG
standard is quite large and the currently supported hardware MPEG
encoders each only implement a subset of this standard. Further more,
many parameters relating to how the video is encoded into an MPEG
stream are specific to the MPEG encoding chip since the MPEG standard
only defines the format of the resulting MPEG stream, not how the
video is actually encoded into that format.</para>

      <para>Unfortunately, the original control API lacked some
features needed for these new uses and so it was extended into the
(not terribly originally named) extended control API.</para>

      <para>Even though the MPEG encoding API was the first effort
to use the Extended Control API, nowadays there are also other classes
of Extended Controls, such as Camera Controls and FM Transmitter Controls.
The Extended Controls API as well as all Extended Controls classes are
described in the following text.</para>
    </section>

    <section>
      <title>The Extended Control API</title>

      <para>Three new ioctls are available: &VIDIOC-G-EXT-CTRLS;,
&VIDIOC-S-EXT-CTRLS; and &VIDIOC-TRY-EXT-CTRLS;. These ioctls act on
arrays of controls (as opposed to the &VIDIOC-G-CTRL; and
&VIDIOC-S-CTRL; ioctls that act on a single control). This is needed
since it is often required to atomically change several controls at
once.</para>

      <para>Each of the new ioctls expects a pointer to a
&v4l2-ext-controls;. This structure contains a pointer to the control
array, a count of the number of controls in that array and a control
class. Control classes are used to group similar controls into a
single class. For example, control class
<constant>V4L2_CTRL_CLASS_USER</constant> contains all user controls
(&ie; all controls that can also be set using the old
<constant>VIDIOC_S_CTRL</constant> ioctl). Control class
<constant>V4L2_CTRL_CLASS_MPEG</constant> contains all controls
relating to MPEG encoding, etc.</para>

      <para>All controls in the control array must belong to the
specified control class. An error is returned if this is not the
case.</para>

      <para>It is also possible to use an empty control array (count
== 0) to check whether the specified control class is
supported.</para>

      <para>The control array is a &v4l2-ext-control; array. The
<structname>v4l2_ext_control</structname> structure is very similar to
&v4l2-control;, except for the fact that it also allows for 64-bit
values and pointers to be passed.</para>

      <para>It is important to realize that due to the flexibility of
controls it is necessary to check whether the control you want to set
actually is supported in the driver and what the valid range of values
is. So use the &VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls to
check this. Also note that it is possible that some of the menu
indices in a control of type <constant>V4L2_CTRL_TYPE_MENU</constant>
may not be supported (<constant>VIDIOC_QUERYMENU</constant> will
return an error). A good example is the list of supported MPEG audio
bitrates. Some drivers only support one or two bitrates, others
support a wider range.</para>

      <para>
	All controls use machine endianness.
      </para>
    </section>

    <section>
      <title>Enumerating Extended Controls</title>

      <para>The recommended way to enumerate over the extended
controls is by using &VIDIOC-QUERYCTRL; in combination with the
<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag:</para>

      <informalexample>
	<programlisting>
&v4l2-queryctrl; qctrl;

qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &amp;qctrl)) {
	/* ... */
	qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
}
</programlisting>
      </informalexample>

      <para>The initial control ID is set to 0 ORed with the
<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag. The
<constant>VIDIOC_QUERYCTRL</constant> ioctl will return the first
control with a higher ID than the specified one. When no such controls
are found an error is returned.</para>

      <para>If you want to get all controls within a specific control
class, then you can set the initial
<structfield>qctrl.id</structfield> value to the control class and add
an extra check to break out of the loop when a control of another
control class is found:</para>

      <informalexample>
	<programlisting>
qctrl.id = V4L2_CTRL_CLASS_MPEG | V4L2_CTRL_FLAG_NEXT_CTRL;
while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &amp;qctrl)) {
	if (V4L2_CTRL_ID2CLASS (qctrl.id) != V4L2_CTRL_CLASS_MPEG)
		break;
		/* ... */
		qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
	}
</programlisting>
      </informalexample>

      <para>The 32-bit <structfield>qctrl.id</structfield> value is
subdivided into three bit ranges: the top 4 bits are reserved for
flags (&eg; <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>) and are not
actually part of the ID. The remaining 28 bits form the control ID, of
which the most significant 12 bits define the control class and the
least significant 16 bits identify the control within the control
class. It is guaranteed that these last 16 bits are always non-zero
for controls. The range of 0x1000 and up are reserved for
driver-specific controls. The macro
<constant>V4L2_CTRL_ID2CLASS(id)</constant> returns the control class
ID based on a control ID.</para>

      <para>If the driver does not support extended controls, then
<constant>VIDIOC_QUERYCTRL</constant> will fail when used in
combination with <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>. In
that case the old method of enumerating control should be used (see
1.8). But if it is supported, then it is guaranteed to enumerate over
all controls, including driver-private controls.</para>
    </section>

    <section>
      <title>Creating Control Panels</title>

      <para>It is possible to create control panels for a graphical
user interface where the user can select the various controls.
Basically you will have to iterate over all controls using the method
described above. Each control class starts with a control of type
<constant>V4L2_CTRL_TYPE_CTRL_CLASS</constant>.
<constant>VIDIOC_QUERYCTRL</constant> will return the name of this
control class which can be used as the title of a tab page within a
control panel.</para>

      <para>The flags field of &v4l2-queryctrl; also contains hints on
the behavior of the control. See the &VIDIOC-QUERYCTRL; documentation
for more details.</para>
    </section>

    <section id="mpeg-controls">
      <title>MPEG Control Reference</title>

      <para>Below all controls within the MPEG control class are
described. First the generic controls, then controls specific for
certain hardware.</para>

      <section>
	<title>Generic MPEG Controls</title>

	<table pgwide="1" frame="none" id="mpeg-control-id">
	  <title>MPEG Control IDs</title>
	  <tgroup cols="4">
	    <colspec colname="c1" colwidth="1*" />
	    <colspec colname="c2" colwidth="6*" />
	    <colspec colname="c3" colwidth="2*" />
	    <colspec colname="c4" colwidth="6*" />
	    <spanspec namest="c1" nameend="c2" spanname="id" />
	    <spanspec namest="c2" nameend="c4" spanname="descr" />
	    <thead>
	      <row>
		<entry spanname="id" align="left">ID</entry>
		<entry align="left">Type</entry>
	      </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
	      </row>
	    </thead>
	    <tbody valign="top">
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CLASS</constant>&nbsp;</entry>
		<entry>class</entry>
	      </row><row><entry spanname="descr">The MPEG class
descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
description of this control class. This description can be used as the
caption of a Tab page in a GUI, for example.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-stream-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_stream_type</entry>
	      </row><row><entry spanname="descr">The MPEG-1, -2 or -4
output stream type. One cannot assume anything here. Each hardware
MPEG encoder tends to support different subsets of the available MPEG
stream types. This control is specific to multiplexed MPEG streams.
The currently defined stream types are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_PS</constant>&nbsp;</entry>
		      <entry>MPEG-2 program stream</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_TS</constant>&nbsp;</entry>
		      <entry>MPEG-2 transport stream</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_SS</constant>&nbsp;</entry>
		      <entry>MPEG-1 system stream</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_DVD</constant>&nbsp;</entry>
		      <entry>MPEG-2 DVD-compatible stream</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_VCD</constant>&nbsp;</entry>
		      <entry>MPEG-1 VCD-compatible stream</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD</constant>&nbsp;</entry>
		      <entry>MPEG-2 SVCD-compatible stream</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PMT</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Program Map Table
Packet ID for the MPEG transport stream (default 16)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_AUDIO</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Audio Packet ID for
the MPEG transport stream (default 256)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_VIDEO</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Video Packet ID for
the MPEG transport stream (default 260)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PCR</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Packet ID for the
MPEG transport stream carrying PCR fields (default 259)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_AUDIO</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Audio ID for MPEG
PES</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_VIDEO</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Video ID for MPEG
PES</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-stream-vbi-fmt">
		<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_VBI_FMT</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_stream_vbi_fmt</entry>
	      </row><row><entry spanname="descr">Some cards can embed
VBI data (&eg; Closed Caption, Teletext) into the MPEG stream. This
control selects whether VBI data should be embedded, and if so, what
embedding method should be used. The list of possible VBI formats
depends on the driver. The currently defined VBI format types
are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_NONE</constant>&nbsp;</entry>
		      <entry>No VBI in the MPEG stream</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant>&nbsp;</entry>
		      <entry>VBI in private packets, IVTV format (documented
in the kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.vbi</filename>)</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-sampling-freq">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_sampling_freq</entry>
	      </row><row><entry spanname="descr">MPEG Audio sampling
frequency. Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100</constant>&nbsp;</entry>
		      <entry>44.1 kHz</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000</constant>&nbsp;</entry>
		      <entry>48 kHz</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000</constant>&nbsp;</entry>
		      <entry>32 kHz</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-encoding">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_ENCODING</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_encoding</entry>
	      </row><row><entry spanname="descr">MPEG Audio encoding.
This control is specific to multiplexed MPEG streams.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_1</constant>&nbsp;</entry>
		      <entry>MPEG-1/2 Layer I encoding</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_2</constant>&nbsp;</entry>
		      <entry>MPEG-1/2 Layer II encoding</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_3</constant>&nbsp;</entry>
		      <entry>MPEG-1/2 Layer III encoding</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AAC</constant>&nbsp;</entry>
		      <entry>MPEG-2/4 AAC (Advanced Audio Coding)</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AC3</constant>&nbsp;</entry>
		      <entry>AC-3 aka ATSC A/52 encoding</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-l1-bitrate">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L1_BITRATE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_l1_bitrate</entry>
	      </row><row><entry spanname="descr">MPEG-1/2 Layer I bitrate.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_32K</constant>&nbsp;</entry>
		      <entry>32 kbit/s</entry></row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_64K</constant>&nbsp;</entry>
		      <entry>64 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_96K</constant>&nbsp;</entry>
		      <entry>96 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_128K</constant>&nbsp;</entry>
		      <entry>128 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_160K</constant>&nbsp;</entry>
		      <entry>160 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_192K</constant>&nbsp;</entry>
		      <entry>192 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_224K</constant>&nbsp;</entry>
		      <entry>224 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_256K</constant>&nbsp;</entry>
		      <entry>256 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_288K</constant>&nbsp;</entry>
		      <entry>288 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_320K</constant>&nbsp;</entry>
		      <entry>320 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_352K</constant>&nbsp;</entry>
		      <entry>352 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_384K</constant>&nbsp;</entry>
		      <entry>384 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_416K</constant>&nbsp;</entry>
		      <entry>416 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_448K</constant>&nbsp;</entry>
		      <entry>448 kbit/s</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-l2-bitrate">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L2_BITRATE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_l2_bitrate</entry>
	      </row><row><entry spanname="descr">MPEG-1/2 Layer II bitrate.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_32K</constant>&nbsp;</entry>
		      <entry>32 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_48K</constant>&nbsp;</entry>
		      <entry>48 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_56K</constant>&nbsp;</entry>
		      <entry>56 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_64K</constant>&nbsp;</entry>
		      <entry>64 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_80K</constant>&nbsp;</entry>
		      <entry>80 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_96K</constant>&nbsp;</entry>
		      <entry>96 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_112K</constant>&nbsp;</entry>
		      <entry>112 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_128K</constant>&nbsp;</entry>
		      <entry>128 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_160K</constant>&nbsp;</entry>
		      <entry>160 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_192K</constant>&nbsp;</entry>
		      <entry>192 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_224K</constant>&nbsp;</entry>
		      <entry>224 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_256K</constant>&nbsp;</entry>
		      <entry>256 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_320K</constant>&nbsp;</entry>
		      <entry>320 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_384K</constant>&nbsp;</entry>
		      <entry>384 kbit/s</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-l3-bitrate">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L3_BITRATE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_l3_bitrate</entry>
	      </row><row><entry spanname="descr">MPEG-1/2 Layer III bitrate.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_32K</constant>&nbsp;</entry>
		      <entry>32 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_40K</constant>&nbsp;</entry>
		      <entry>40 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_48K</constant>&nbsp;</entry>
		      <entry>48 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_56K</constant>&nbsp;</entry>
		      <entry>56 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_64K</constant>&nbsp;</entry>
		      <entry>64 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_80K</constant>&nbsp;</entry>
		      <entry>80 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_96K</constant>&nbsp;</entry>
		      <entry>96 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_112K</constant>&nbsp;</entry>
		      <entry>112 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_128K</constant>&nbsp;</entry>
		      <entry>128 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_160K</constant>&nbsp;</entry>
		      <entry>160 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_192K</constant>&nbsp;</entry>
		      <entry>192 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_224K</constant>&nbsp;</entry>
		      <entry>224 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_256K</constant>&nbsp;</entry>
		      <entry>256 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_320K</constant>&nbsp;</entry>
		      <entry>320 kbit/s</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AAC_BITRATE</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">AAC bitrate in bits per second.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-ac3-bitrate">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AC3_BITRATE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_ac3_bitrate</entry>
	      </row><row><entry spanname="descr">AC-3 bitrate.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_32K</constant>&nbsp;</entry>
		      <entry>32 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_40K</constant>&nbsp;</entry>
		      <entry>40 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_48K</constant>&nbsp;</entry>
		      <entry>48 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_56K</constant>&nbsp;</entry>
		      <entry>56 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_64K</constant>&nbsp;</entry>
		      <entry>64 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_80K</constant>&nbsp;</entry>
		      <entry>80 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_96K</constant>&nbsp;</entry>
		      <entry>96 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_112K</constant>&nbsp;</entry>
		      <entry>112 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_128K</constant>&nbsp;</entry>
		      <entry>128 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_160K</constant>&nbsp;</entry>
		      <entry>160 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_192K</constant>&nbsp;</entry>
		      <entry>192 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_224K</constant>&nbsp;</entry>
		      <entry>224 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_256K</constant>&nbsp;</entry>
		      <entry>256 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_320K</constant>&nbsp;</entry>
		      <entry>320 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_384K</constant>&nbsp;</entry>
		      <entry>384 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_448K</constant>&nbsp;</entry>
		      <entry>448 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_512K</constant>&nbsp;</entry>
		      <entry>512 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_576K</constant>&nbsp;</entry>
		      <entry>576 kbit/s</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_640K</constant>&nbsp;</entry>
		      <entry>640 kbit/s</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_mode</entry>
	      </row><row><entry spanname="descr">MPEG Audio mode.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_STEREO</constant>&nbsp;</entry>
		      <entry>Stereo</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_JOINT_STEREO</constant>&nbsp;</entry>
		      <entry>Joint Stereo</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_DUAL</constant>&nbsp;</entry>
		      <entry>Bilingual</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_MONO</constant>&nbsp;</entry>
		      <entry>Mono</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-mode-extension">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE_EXTENSION</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_mode_extension</entry>
	      </row><row><entry spanname="descr">Joint Stereo
audio mode extension. In Layer I and II they indicate which subbands
are in intensity stereo. All other subbands are coded in stereo. Layer
III is not (yet) supported. Possible values
are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4</constant>&nbsp;</entry>
		      <entry>Subbands 4-31 in intensity stereo</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_8</constant>&nbsp;</entry>
		      <entry>Subbands 8-31 in intensity stereo</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_12</constant>&nbsp;</entry>
		      <entry>Subbands 12-31 in intensity stereo</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16</constant>&nbsp;</entry>
		      <entry>Subbands 16-31 in intensity stereo</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-emphasis">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_EMPHASIS</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_emphasis</entry>
	      </row><row><entry spanname="descr">Audio Emphasis.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_NONE</constant>&nbsp;</entry>
		      <entry>None</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_50_DIV_15_uS</constant>&nbsp;</entry>
		      <entry>50/15 microsecond emphasis</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17</constant>&nbsp;</entry>
		      <entry>CCITT J.17</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-crc">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_CRC</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_crc</entry>
	      </row><row><entry spanname="descr">CRC method. Possible
values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_CRC_NONE</constant>&nbsp;</entry>
		      <entry>None</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_CRC_CRC16</constant>&nbsp;</entry>
		      <entry>16 bit parity check</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MUTE</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Mutes the audio when
capturing. This is not done by muting audio hardware, which can still
produce a slight hiss, but in the encoder itself, guaranteeing a fixed
and reproducible audio bitstream. 0 = unmuted, 1 = muted.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-dec-playback">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
	      </row><row><entry spanname="descr">Determines how monolingual audio should be played back.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_AUTO</constant>&nbsp;</entry>
		      <entry>Automatically determines the best playback mode.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO</constant>&nbsp;</entry>
		      <entry>Stereo playback.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT</constant>&nbsp;</entry>
		      <entry>Left channel playback.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT</constant>&nbsp;</entry>
		      <entry>Right channel playback.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO</constant>&nbsp;</entry>
		      <entry>Mono playback.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO</constant>&nbsp;</entry>
		      <entry>Stereo playback with swapped left and right channels.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-audio-dec-multilingual-playback">
		<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
	      </row><row><entry spanname="descr">Determines how multilingual audio should be played back.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-encoding">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ENCODING</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_encoding</entry>
	      </row><row><entry spanname="descr">MPEG Video encoding
method. This control is specific to multiplexed MPEG streams.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_1</constant>&nbsp;</entry>
		      <entry>MPEG-1 Video encoding</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_2</constant>&nbsp;</entry>
		      <entry>MPEG-2 Video encoding</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC</constant>&nbsp;</entry>
		      <entry>MPEG-4 AVC (H.264) Video encoding</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-aspect">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ASPECT</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_aspect</entry>
	      </row><row><entry spanname="descr">Video aspect.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_1x1</constant>&nbsp;</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_4x3</constant>&nbsp;</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_16x9</constant>&nbsp;</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_221x100</constant>&nbsp;</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_B_FRAMES</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Number of B-Frames
(default 2)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_SIZE</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">GOP size (default
12)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_CLOSURE</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">GOP closure (default
1)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_PULLDOWN</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Enable 3:2 pulldown
(default 0)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-bitrate-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_bitrate_mode</entry>
	      </row><row><entry spanname="descr">Video bitrate mode.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_VBR</constant>&nbsp;</entry>
		      <entry>Variable bitrate</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_CBR</constant>&nbsp;</entry>
		      <entry>Constant bitrate</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Video bitrate in bits
per second.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_PEAK</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Peak video bitrate in
bits per second. Must be larger or equal to the average video bitrate.
It is ignored if the video bitrate mode is set to constant
bitrate.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">For every captured
frame, skip this many subsequent frames (default 0).</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">"Mutes" the video to a
fixed color when capturing. This is useful for testing, to produce a
fixed video bitstream. 0 = unmuted, 1 = muted.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE_YUV</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Sets the "mute" color
of the video. The supplied 32-bit integer is interpreted as follows (bit
0 = least significant bit):</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry>Bit 0:7</entry>
		      <entry>V chrominance information</entry>
		    </row>
		    <row>
		      <entry>Bit 8:15</entry>
		      <entry>U chrominance information</entry>
		    </row>
		    <row>
		      <entry>Bit 16:23</entry>
		      <entry>Y luminance information</entry>
		    </row>
		    <row>
		      <entry>Bit 24:31</entry>
		      <entry>Must be zero.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-dec-pts">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_PTS</constant>&nbsp;</entry>
		<entry>integer64</entry>
	      </row><row><entry spanname="descr">This read-only control returns the
33-bit video Presentation Time Stamp as defined in ITU T-REC-H.222.0 and ISO/IEC 13818-1 of
the currently displayed frame. This is the same PTS as is used in &VIDIOC-DECODER-CMD;.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-dec-frame">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_FRAME</constant>&nbsp;</entry>
		<entry>integer64</entry>
	      </row><row><entry spanname="descr">This read-only control returns the
frame counter of the frame that is currently displayed (decoded). This value is reset to 0 whenever
the decoder is started.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">If enabled the decoder expects to receive a single slice per buffer, otherwise
the decoder expects a single frame in per buffer. Applicable to the decoder, all codecs.
</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Enable writing sample aspect ratio in the Video Usability Information.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-vui-sar-idc">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_vui_sar_idc</entry>
	      </row>
	      <row><entry spanname="descr">VUI sample aspect ratio indicator for H.264 encoding. The value
is defined in the table E-1 in the standard. Applicable to the H264 encoder.</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">

			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_UNSPECIFIED</constant>&nbsp;</entry>
			  <entry>Unspecified</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_1x1</constant>&nbsp;</entry>
			  <entry>1x1</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_12x11</constant>&nbsp;</entry>
			  <entry>12x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_10x11</constant>&nbsp;</entry>
			  <entry>10x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_16x11</constant>&nbsp;</entry>
			  <entry>16x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_40x33</constant>&nbsp;</entry>
			  <entry>40x33</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_24x11</constant>&nbsp;</entry>
			  <entry>24x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_20x11</constant>&nbsp;</entry>
			  <entry>20x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_32x11</constant>&nbsp;</entry>
			  <entry>32x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_80x33</constant>&nbsp;</entry>
			  <entry>80x33</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_18x11</constant>&nbsp;</entry>
			  <entry>18x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_15x11</constant>&nbsp;</entry>
			  <entry>15x11</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_64x33</constant>&nbsp;</entry>
			  <entry>64x33</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_160x99</constant>&nbsp;</entry>
			  <entry>160x99</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_4x3</constant>&nbsp;</entry>
			  <entry>4x3</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_3x2</constant>&nbsp;</entry>
			  <entry>3x2</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1</constant>&nbsp;</entry>
			  <entry>2x1</entry>
			</row>
			<row>
			  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED</constant>&nbsp;</entry>
			  <entry>Extended SAR</entry>
			</row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Extended sample aspect ratio width for H.264 VUI encoding.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Extended sample aspect ratio height for H.264 VUI encoding.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-level">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LEVEL</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_level</entry>
	      </row>
	      <row><entry spanname="descr">The level information for the H264 video elementary stream.
Applicable to the H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_0</constant>&nbsp;</entry>
		      <entry>Level 1.0</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1B</constant>&nbsp;</entry>
		      <entry>Level 1B</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_1</constant>&nbsp;</entry>
		      <entry>Level 1.1</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_2</constant>&nbsp;</entry>
		      <entry>Level 1.2</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_3</constant>&nbsp;</entry>
		      <entry>Level 1.3</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_0</constant>&nbsp;</entry>
		      <entry>Level 2.0</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_1</constant>&nbsp;</entry>
		      <entry>Level 2.1</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_2</constant>&nbsp;</entry>
		      <entry>Level 2.2</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_0</constant>&nbsp;</entry>
		      <entry>Level 3.0</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_1</constant>&nbsp;</entry>
		      <entry>Level 3.1</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_2</constant>&nbsp;</entry>
		      <entry>Level 3.2</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_0</constant>&nbsp;</entry>
		      <entry>Level 4.0</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_1</constant>&nbsp;</entry>
		      <entry>Level 4.1</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_2</constant>&nbsp;</entry>
		      <entry>Level 4.2</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_0</constant>&nbsp;</entry>
		      <entry>Level 5.0</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_1</constant>&nbsp;</entry>
		      <entry>Level 5.1</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-mpeg4-level">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_mpeg4_level</entry>
	      </row>
	      <row><entry spanname="descr">The level information for the MPEG4 elementary stream.
Applicable to the MPEG4 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0</constant>&nbsp;</entry>
		      <entry>Level 0</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0B</constant>&nbsp;</entry>
		      <entry>Level 0b</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_1</constant>&nbsp;</entry>
		      <entry>Level 1</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_2</constant>&nbsp;</entry>
		      <entry>Level 2</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3</constant>&nbsp;</entry>
		      <entry>Level 3</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3B</constant>&nbsp;</entry>
		      <entry>Level 3b</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_4</constant>&nbsp;</entry>
		      <entry>Level 4</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_5</constant>&nbsp;</entry>
		      <entry>Level 5</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-profile">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_PROFILE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_profile</entry>
	      </row>
	      <row><entry spanname="descr">The profile information for H264.
Applicable to the H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE</constant>&nbsp;</entry>
		      <entry>Baseline profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE</constant>&nbsp;</entry>
		      <entry>Constrained Baseline profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MAIN</constant>&nbsp;</entry>
		      <entry>Main profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED</constant>&nbsp;</entry>
		      <entry>Extended profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH</constant>&nbsp;</entry>
		      <entry>High profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10</constant>&nbsp;</entry>
		      <entry>High 10 profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422</constant>&nbsp;</entry>
		      <entry>High 422 profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE</constant>&nbsp;</entry>
		      <entry>High 444 Predictive profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10_INTRA</constant>&nbsp;</entry>
		      <entry>High 10 Intra profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422_INTRA</constant>&nbsp;</entry>
		      <entry>High 422 Intra profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_INTRA</constant>&nbsp;</entry>
		      <entry>High 444 Intra profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CAVLC_444_INTRA</constant>&nbsp;</entry>
		      <entry>CAVLC 444 Intra profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE</constant>&nbsp;</entry>
		      <entry>Scalable Baseline profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH</constant>&nbsp;</entry>
		      <entry>Scalable High profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH_INTRA</constant>&nbsp;</entry>
		      <entry>Scalable High Intra profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH</constant>&nbsp;</entry>
		      <entry>Stereo High profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH</constant>&nbsp;</entry>
		      <entry>Multiview High profile</entry>
		    </row>

		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-mpeg4-profile">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_mpeg4_profile</entry>
	      </row>
	      <row><entry spanname="descr">The profile information for MPEG4.
Applicable to the MPEG4 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE</constant>&nbsp;</entry>
		      <entry>Simple profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_SIMPLE</constant>&nbsp;</entry>
		      <entry>Advanced Simple profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_CORE</constant>&nbsp;</entry>
		      <entry>Core profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE_SCALABLE</constant>&nbsp;</entry>
		      <entry>Simple Scalable profile</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_CODING_EFFICIENCY</constant>&nbsp;</entry>
		      <entry></entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MAX_REF_PIC</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">The maximum number of reference pictures used for encoding.
Applicable to the encoder.
</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-multi-slice-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_multi_slice_mode</entry>
	      </row>
	      <row><entry spanname="descr">Determines how the encoder should handle division of frame into slices.
Applicable to the encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE</constant>&nbsp;</entry>
		      <entry>Single slice per frame.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>&nbsp;</entry>
		      <entry>Multiple slices with set maximum number of macroblocks per slice.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>&nbsp;</entry>
		      <entry>Multiple slice with set maximum size in bytes per slice.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">The maximum number of macroblocks in a slice. Used when
<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>.
Applicable to the encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">The maximum size of a slice in bytes. Used when
<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>.
Applicable to the encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-loop-filter-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_loop_filter_mode</entry>
	      </row>
	      <row><entry spanname="descr">Loop filter mode for H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_ENABLED</constant>&nbsp;</entry>
		      <entry>Loop filter is enabled.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED</constant>&nbsp;</entry>
		      <entry>Loop filter is disabled.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY</constant>&nbsp;</entry>
		      <entry>Loop filter is disabled at the slice boundary.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Loop filter alpha coefficient, defined in the H264 standard.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Loop filter beta coefficient, defined in the H264 standard.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-entropy-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_entropy_mode</entry>
	      </row>
	      <row><entry spanname="descr">Entropy coding mode for H264 - CABAC/CAVALC.
Applicable to the H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CAVLC</constant>&nbsp;</entry>
		      <entry>Use CAVLC entropy coding.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC</constant>&nbsp;</entry>
		      <entry>Use CABAC entropy coding.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Enable 8X8 transform for H264. Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Cyclic intra macroblock refresh. This is the number of continuous macroblocks
refreshed every frame. Each frame a successive set of macroblocks is refreshed until the cycle completes and starts from the
top of the frame. Applicable to H264, H263 and MPEG4 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Frame level rate control enable.
If this control is disabled then the quantization parameter for each frame type is constant and set with appropriate controls
(e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>).
If frame rate control is enabled then quantization parameter is adjusted to meet the chosen bitrate. Minimum and maximum value
for the quantization parameter can be set with appropriate controls (e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>).
Applicable to encoders.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Macroblock level rate control enable.
Applicable to the MPEG4 and H264 encoders.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_QPEL</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Quarter pixel motion estimation for MPEG4. Applicable to the MPEG4 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an I frame for H263. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Minimum quantization parameter for H263. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MAX_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Maximum quantization parameter for H263. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an P frame for H263. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an B frame for H263. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an I frame for H264. Valid range: from 0 to 51.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MIN_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Minimum quantization parameter for H264. Valid range: from 0 to 51.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MAX_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Maximum quantization parameter for H264. Valid range: from 0 to 51.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an P frame for H264. Valid range: from 0 to 51.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an B frame for H264. Valid range: from 0 to 51.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an I frame for MPEG4. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Minimum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Maximum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an P frame for MPEG4. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Quantization parameter for an B frame for MPEG4. Valid range: from 1 to 31.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_SIZE</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">The Video Buffer Verifier size in kilobytes, it is used as a limitation of frame skip.
The VBV is defined in the standard as a mean to verify that the produced stream will be successfully decoded.
The standard describes it as "Part of a hypothetical decoder that is conceptually connected to the
output of the encoder. Its purpose is to provide a constraint on the variability of the data rate that an
encoder or editing process may produce.".
Applicable to the MPEG1, MPEG2, MPEG4 encoders.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-vbv-delay">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_DELAY</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Sets the initial delay in milliseconds for
VBV buffer control.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">The Coded Picture Buffer size in kilobytes, it is used as a limitation of frame skip.
The CPB is defined in the H264 standard as a mean to verify that the produced stream will be successfully decoded.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_PERIOD</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Period between I-frames in the open GOP for H264. In case of an open GOP
this is the period between two I-frames. The period between IDR (Instantaneous Decoding Refresh) frames is taken from the GOP_SIZE control.
An IDR frame, which stands for Instantaneous Decoding Refresh is an I-frame after which no prior frames are
referenced. This means that a stream can be restarted from an IDR frame without the need to store or decode any
previous frames. Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-header-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_HEADER_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_header_mode</entry>
	      </row>
	      <row><entry spanname="descr">Determines whether the header is returned as the first buffer or is
it returned together with the first frame. Applicable to encoders.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE</constant>&nbsp;</entry>
		      <entry>The stream header is returned separately in the first buffer.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME</constant>&nbsp;</entry>
		      <entry>The stream header is returned together with the first encoded frame.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Repeat the video sequence headers. Repeating these
headers makes random access to the video stream easier. Applicable to the MPEG1, 2 and 4 encoder.</entry>
	      </row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Enabled the deblocking post processing filter for MPEG4 decoder.
Applicable to the MPEG4 decoder.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_RES</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">vop_time_increment_resolution value for MPEG4. Applicable to the MPEG4 encoder.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_INC</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">vop_time_increment value for MPEG4. Applicable to the MPEG4 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Enable generation of frame packing supplemental enhancement information in the encoded bitstream.
The frame packing SEI message contains the arrangement of L and R planes for 3D viewing. Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Sets current frame as frame0 in frame packing SEI.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-sei-fp-arrangement-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_sei_fp_arrangement_type</entry>
	      </row>
	      <row><entry spanname="descr">Frame packing arrangement type for H264 SEI.
Applicable to the H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD</constant>&nbsp;</entry>
		      <entry>Pixels are alternatively from L and R.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN</constant>&nbsp;</entry>
		      <entry>L and R are interlaced by column.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW</constant>&nbsp;</entry>
		      <entry>L and R are interlaced by row.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE</constant>&nbsp;</entry>
		      <entry>L is on the left, R on the right.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM</constant>&nbsp;</entry>
		      <entry>L is on top, R on bottom.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL</constant>&nbsp;</entry>
		      <entry>One view per frame.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Enables flexible macroblock ordering in the encoded bitstream. It is a technique
used for restructuring the ordering of macroblocks in pictures. Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-fmo-map-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_fmo_map_type</entry>
	      </row>
	      <row><entry spanname="descr">When using FMO, the map type divides the image in different scan patterns of macroblocks.
Applicable to the H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES</constant>&nbsp;</entry>
		      <entry>Slices are interleaved one after other with macroblocks in run length order.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES</constant>&nbsp;</entry>
		      <entry>Scatters the macroblocks based on a mathematical function known to both encoder and decoder.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER</constant>&nbsp;</entry>
		      <entry>Macroblocks arranged in rectangular areas or regions of interest.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT</constant>&nbsp;</entry>
		      <entry>Slice groups grow in a cyclic way from centre to outwards.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN</constant>&nbsp;</entry>
		      <entry>Slice groups grow in raster scan pattern from left to right.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN</constant>&nbsp;</entry>
		      <entry>Slice groups grow in wipe scan pattern from top to bottom.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT</constant>&nbsp;</entry>
		      <entry>User defined map type.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Number of slice groups in FMO.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-fmo-change-direction">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_fmo_change_dir</entry>
	      </row>
	      <row><entry spanname="descr">Specifies a direction of the slice group change for raster and wipe maps.
Applicable to the H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT</constant>&nbsp;</entry>
		      <entry>Raster scan or wipe right.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT</constant>&nbsp;</entry>
		      <entry>Reverse raster scan or wipe left.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Specifies the size of the first slice group for raster and wipe map.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Specifies the number of consecutive macroblocks for the interleaved map.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Enables arbitrary slice ordering in encoded bitstream.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Specifies the slice order in ASO. Applicable to the H264 encoder.
The supplied 32-bit integer is interpreted as follows (bit
0 = least significant bit):</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry>Bit 0:15</entry>
		      <entry>Slice ID</entry>
		    </row>
		    <row>
		      <entry>Bit 16:32</entry>
		      <entry>Slice position or order</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">Enables H264 hierarchical coding.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-video-h264-hierarchical-coding-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_video_h264_hierarchical_coding_type</entry>
	      </row>
	      <row><entry spanname="descr">Specifies the hierarchical coding type.
Applicable to the H264 encoder.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B</constant>&nbsp;</entry>
		      <entry>Hierarchical B coding.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P</constant>&nbsp;</entry>
		      <entry>Hierarchical P coding.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row>
	      <row><entry spanname="descr">Specifies the number of hierarchical coding layers.
Applicable to the H264 encoder.</entry>
	      </row>

	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Specifies a user defined QP for each layer. Applicable to the H264 encoder.
The supplied 32-bit integer is interpreted as follows (bit
0 = least significant bit):</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry>Bit 0:15</entry>
		      <entry>QP value</entry>
		    </row>
		    <row>
		      <entry>Bit 16:32</entry>
		      <entry>Layer number</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>

	    </tbody>
	  </tgroup>
	</table>
      </section>

      <section>
	<title>MFC 5.1 MPEG Controls</title>

	<para>The following MPEG class controls deal with MPEG
decoding and encoding settings that are specific to the Multi Format Codec 5.1 device present
in the S5P family of SoCs by Samsung.
</para>

	<table pgwide="1" frame="none" id="mfc51-control-id">
	  <title>MFC 5.1 Control IDs</title>
	  <tgroup cols="4">
	    <colspec colname="c1" colwidth="1*" />
	    <colspec colname="c2" colwidth="6*" />
	    <colspec colname="c3" colwidth="2*" />
	    <colspec colname="c4" colwidth="6*" />
	    <spanspec namest="c1" nameend="c2" spanname="id" />
	    <spanspec namest="c2" nameend="c4" spanname="descr" />
	    <thead>
	      <row>
		<entry spanname="id" align="left">ID</entry>
		<entry align="left">Type</entry>
	      </row><row><entry spanname="descr" align="left">Description</entry>
	      </row>
	    </thead>
	    <tbody valign="top">
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY_ENABLE</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">If the display delay is enabled then the decoder has to return a
CAPTURE buffer after processing a certain number of OUTPUT buffers. If this number is low, then it may result in
buffers not being dequeued in display order. In addition hardware may still use those buffers as reference, thus
application should not write to those buffers. This feature can be used for example for generating thumbnails of videos.
Applicable to the H264 decoder.
	      </entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Display delay value for H264 decoder.
The decoder is forced to return a decoded frame after the set 'display delay' number of frames. If this number is
low it may result in frames returned out of dispaly order, in addition the hardware may still be using the returned buffer
as a reference picture for subsequent frames.
</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_NUM_REF_PIC_FOR_P</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">The number of reference pictures used for encoding a P picture.
Applicable to the H264 encoder.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Padding enable in the encoder - use a color instead of repeating border pixels.
Applicable to encoders.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING_YUV</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Padding color in the encoder. Applicable to encoders. The supplied 32-bit integer is interpreted as follows (bit
0 = least significant bit):</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry>Bit 0:7</entry>
		      <entry>V chrominance information</entry>
		    </row>
		    <row>
		      <entry>Bit 8:15</entry>
		      <entry>U chrominance information</entry>
		    </row>
		    <row>
		      <entry>Bit 16:23</entry>
		      <entry>Y luminance information</entry>
		    </row>
		    <row>
		      <entry>Bit 24:31</entry>
		      <entry>Must be zero.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_REACTION_COEFF</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Reaction coefficient for MFC rate control. Applicable to encoders.
<para>Note 1: Valid only when the frame level RC is enabled.</para>
<para>Note 2: For tight CBR, this field must be small (ex. 2 ~ 10).
For VBR, this field must be large (ex. 100 ~ 1000).</para>
<para>Note 3: It is not recommended to use the greater number than FRAME_RATE * (10^9 / BIT_RATE).</para>
</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_DARK</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Adaptive rate control for dark region.
Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
Applicable to the H264 encoder.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_SMOOTH</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Adaptive rate control for smooth region.
Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
Applicable to the H264 encoder.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_STATIC</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Adaptive rate control for static region.
Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
Applicable to the H264 encoder.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_ACTIVITY</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row><row><entry spanname="descr">Adaptive rate control for activity region.
Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
Applicable to the H264 encoder.</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-mfc51-video-frame-skip-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FRAME_SKIP_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_mfc51_video_frame_skip_mode</entry>
	      </row>
	      <row><entry spanname="descr">
Indicates in what conditions the encoder should skip frames. If encoding a frame would cause the encoded stream to be larger then
a chosen data limit then the frame will be skipped.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_DISABLED</constant>&nbsp;</entry>
		      <entry>Frame skip mode is disabled.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT</constant>&nbsp;</entry>
		      <entry>Frame skip mode enabled and buffer limit is set by the chosen level and is defined by the standard.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_BUF_LIMIT</constant>&nbsp;</entry>
		      <entry>Frame skip mode enabled and buffer limit is set by the VBV (MPEG1/2/4) or CPB (H264) buffer size control.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_FIXED_TARGET_BIT</constant>&nbsp;</entry>
		<entry>integer</entry>
	      </row><row><entry spanname="descr">Enable rate-control with fixed target bit.
If this setting is enabled, then the rate control logic of the encoder will calculate the average bitrate
for a GOP and keep it below or equal the set bitrate target. Otherwise the rate control logic calculates the
overall average bitrate for the stream and keeps it below or equal to the set bitrate. In the first case
the average bitrate for the whole stream will be smaller then the set bitrate. This is caused because the
average is calculated for smaller number of frames, on the other hand enabling this setting will ensure that
the stream will meet tight bandwidth contraints. Applicable to encoders.
</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-mfc51-video-force-frame-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_mfc51_video_force_frame_type</entry>
	      </row>
	      <row><entry spanname="descr">Force a frame type for the next queued buffer. Applicable to encoders.
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_DISABLED</constant>&nbsp;</entry>
		      <entry>Forcing a specific frame type disabled.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_I_FRAME</constant>&nbsp;</entry>
		      <entry>Force an I-frame.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_NOT_CODED</constant>&nbsp;</entry>
		      <entry>Force a non-coded frame.</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	    </tbody>
	  </tgroup>
	</table>
      </section>

      <section>
	<title>CX2341x MPEG Controls</title>

	<para>The following MPEG class controls deal with MPEG
encoding settings that are specific to the Conexant CX23415 and
CX23416 MPEG encoding chips.</para>

	<table pgwide="1" frame="none" id="cx2341x-control-id">
	  <title>CX2341x Control IDs</title>
	  <tgroup cols="4">
	    <colspec colname="c1" colwidth="1*" />
	    <colspec colname="c2" colwidth="6*" />
	    <colspec colname="c3" colwidth="2*" />
	    <colspec colname="c4" colwidth="6*" />
	    <spanspec namest="c1" nameend="c2" spanname="id" />
	    <spanspec namest="c2" nameend="c4" spanname="descr" />
	    <thead>
	      <row>
		<entry spanname="id" align="left">ID</entry>
		<entry align="left">Type</entry>
	      </row><row><entry spanname="descr" align="left">Description</entry>
	      </row>
	    </thead>
	    <tbody valign="top">
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-cx2341x-video-spatial-filter-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_spatial_filter_mode</entry>
	      </row><row><entry spanname="descr">Sets the Spatial
Filter mode (default <constant>MANUAL</constant>). Possible values
are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_MANUAL</constant>&nbsp;</entry>
		      <entry>Choose the filter manually</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_AUTO</constant>&nbsp;</entry>
		      <entry>Choose the filter automatically</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER</constant>&nbsp;</entry>
		<entry>integer&nbsp;(0-15)</entry>
	      </row><row><entry spanname="descr">The setting for the
Spatial Filter. 0 = off, 15 = maximum. (Default is 0.)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="luma-spatial-filter-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_luma_spatial_filter_type</entry>
	      </row><row><entry spanname="descr">Select the algorithm
to use for the Luma Spatial Filter (default
<constant>1D_HOR</constant>). Possible values:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_OFF</constant>&nbsp;</entry>
		      <entry>No filter</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_HOR</constant>&nbsp;</entry>
		      <entry>One-dimensional horizontal</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_VERT</constant>&nbsp;</entry>
		      <entry>One-dimensional vertical</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_HV_SEPARABLE</constant>&nbsp;</entry>
		      <entry>Two-dimensional separable</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_SYM_NON_SEPARABLE</constant>&nbsp;</entry>
		      <entry>Two-dimensional symmetrical
non-separable</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="chroma-spatial-filter-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_chroma_spatial_filter_type</entry>
	      </row><row><entry spanname="descr">Select the algorithm
for the Chroma Spatial Filter (default <constant>1D_HOR</constant>).
Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_OFF</constant>&nbsp;</entry>
		      <entry>No filter</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_1D_HOR</constant>&nbsp;</entry>
		      <entry>One-dimensional horizontal</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-cx2341x-video-temporal-filter-mode">
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_temporal_filter_mode</entry>
	      </row><row><entry spanname="descr">Sets the Temporal
Filter mode (default <constant>MANUAL</constant>). Possible values
are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_MANUAL</constant>&nbsp;</entry>
		      <entry>Choose the filter manually</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_AUTO</constant>&nbsp;</entry>
		      <entry>Choose the filter automatically</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER</constant>&nbsp;</entry>
		<entry>integer&nbsp;(0-31)</entry>
	      </row><row><entry spanname="descr">The setting for the
Temporal Filter. 0 = off, 31 = maximum. (Default is 8 for full-scale
capturing and 0 for scaled capturing.)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row id="v4l2-mpeg-cx2341x-video-median-filter-type">
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_median_filter_type</entry>
	      </row><row><entry spanname="descr">Median Filter Type
(default <constant>OFF</constant>). Possible values are:</entry>
	      </row>
	      <row>
		<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_OFF</constant>&nbsp;</entry>
		      <entry>No filter</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR</constant>&nbsp;</entry>
		      <entry>Horizontal filter</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_VERT</constant>&nbsp;</entry>
		      <entry>Vertical filter</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR_VERT</constant>&nbsp;</entry>
		      <entry>Horizontal and vertical filter</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_DIAG</constant>&nbsp;</entry>
		      <entry>Diagonal filter</entry>
		    </row>
		  </tbody>
		</entrytbl>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_BOTTOM</constant>&nbsp;</entry>
		<entry>integer&nbsp;(0-255)</entry>
	      </row><row><entry spanname="descr">Threshold above which
the luminance median filter is enabled (default 0)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_TOP</constant>&nbsp;</entry>
		<entry>integer&nbsp;(0-255)</entry>
	      </row><row><entry spanname="descr">Threshold below which
the luminance median filter is enabled (default 255)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_BOTTOM</constant>&nbsp;</entry>
		<entry>integer&nbsp;(0-255)</entry>
	      </row><row><entry spanname="descr">Threshold above which
the chroma median filter is enabled (default 0)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_TOP</constant>&nbsp;</entry>
		<entry>integer&nbsp;(0-255)</entry>
	      </row><row><entry spanname="descr">Threshold below which
the chroma median filter is enabled (default 255)</entry>
	      </row>
	      <row><entry></entry></row>
	      <row>
		<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_STREAM_INSERT_NAV_PACKETS</constant>&nbsp;</entry>
		<entry>boolean</entry>
	      </row>
	      <row><entry spanname="descr">The CX2341X MPEG encoder
can insert one empty MPEG-2 PES packet into the stream between every
four video frames. The packet size is 2048 bytes, including the
packet_start_code_prefix and stream_id fields. The stream_id is 0xBF
(private stream 2). The payload consists of 0x00 bytes, to be filled
in by the application. 0 = do not insert, 1 = insert packets.</entry>
	      </row>
	    </tbody>
	  </tgroup>
	</table>
      </section>
    </section>

    <section id="camera-controls">
      <title>Camera Control Reference</title>

      <para>The Camera class includes controls for mechanical (or
equivalent digital) features of a device such as controllable lenses
or sensors.</para>

    <table pgwide="1" frame="none" id="camera-control-id">
      <title>Camera Control IDs</title>
      <tgroup cols="4">
	<colspec colname="c1" colwidth="1*" />
	<colspec colname="c2" colwidth="6*" />
	<colspec colname="c3" colwidth="2*" />
	<colspec colname="c4" colwidth="6*" />
	<spanspec namest="c1" nameend="c2" spanname="id" />
	<spanspec namest="c2" nameend="c4" spanname="descr" />
	<thead>
	  <row>
	    <entry spanname="id" align="left">ID</entry>
	    <entry align="left">Type</entry>
	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row><entry></entry></row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_CAMERA_CLASS</constant>&nbsp;</entry>
	    <entry>class</entry>
	  </row><row><entry spanname="descr">The Camera class
descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
description of this control class.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-exposure-auto-type">
	    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO</constant>&nbsp;</entry>
	    <entry>enum&nbsp;v4l2_exposure_auto_type</entry>
	  </row><row><entry spanname="descr">Enables automatic
adjustments of the exposure time and/or iris aperture. The effect of
manual changes of the exposure time or iris aperture while these
features are enabled is undefined, drivers should ignore such
requests. Possible values are:</entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_EXPOSURE_AUTO</constant>&nbsp;</entry>
		      <entry>Automatic exposure time, automatic iris
aperture.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_EXPOSURE_MANUAL</constant>&nbsp;</entry>
		  <entry>Manual exposure time, manual iris.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_EXPOSURE_SHUTTER_PRIORITY</constant>&nbsp;</entry>
		  <entry>Manual exposure time, auto iris.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_EXPOSURE_APERTURE_PRIORITY</constant>&nbsp;</entry>
		  <entry>Auto exposure time, manual iris.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_ABSOLUTE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">Determines the exposure
time of the camera sensor. The exposure time is limited by the frame
interval. Drivers should interpret the values as 100 &micro;s units,
where the value 1 stands for 1/10000th of a second, 10000 for 1 second
and 100000 for 10 seconds.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO_PRIORITY</constant>&nbsp;</entry>
	    <entry>boolean</entry>
	  </row><row><entry spanname="descr">When
<constant>V4L2_CID_EXPOSURE_AUTO</constant> is set to
<constant>AUTO</constant> or <constant>APERTURE_PRIORITY</constant>,
this control determines if the device may dynamically vary the frame
rate. By default this feature is disabled (0) and the frame rate must
remain constant.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant>&nbsp;</entry>
	    <entry>integer menu</entry>
	  </row><row><entry spanname="descr"> Determines the automatic
exposure compensation, it is effective only when <constant>V4L2_CID_EXPOSURE_AUTO</constant>
control is set to <constant>AUTO</constant>, <constant>SHUTTER_PRIORITY </constant>
or <constant>APERTURE_PRIORITY</constant>.
It is expressed in terms of EV, drivers should interpret the values as 0.001 EV
units, where the value 1000 stands for +1 EV.
<para>Increasing the exposure compensation value is equivalent to decreasing
the exposure value (EV) and will increase the amount of light at the image
sensor. The camera performs the exposure compensation by adjusting absolute
exposure time and/or aperture.</para></entry>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-exposure-metering">
	    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_METERING</constant>&nbsp;</entry>
	    <entry>enum&nbsp;v4l2_exposure_metering</entry>
	  </row><row><entry spanname="descr">Determines how the camera measures
the amount of light available for the frame exposure. Possible values are:</entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_EXPOSURE_METERING_AVERAGE</constant>&nbsp;</entry>
		  <entry>Use the light information coming from the entire frame
and average giving no weighting to any particular portion of the metered area.
		  </entry>
		</row>
		<row>
		  <entry><constant>V4L2_EXPOSURE_METERING_CENTER_WEIGHTED</constant>&nbsp;</entry>
		  <entry>Average the light information coming from the entire frame
giving priority to the center of the metered area.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_EXPOSURE_METERING_SPOT</constant>&nbsp;</entry>
		  <entry>Measure only very small area at the center of the frame.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_EXPOSURE_METERING_MATRIX</constant>&nbsp;</entry>
		  <entry>A multi-zone metering. The light intensity is measured
in several points of the frame and the the results are combined. The
algorithm of the zones selection and their significance in calculating the
final value is device dependent.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control turns the
camera horizontally by the specified amount. The unit is undefined. A
positive value moves the camera to the right (clockwise when viewed
from above), a negative value to the left. A value of zero does not
cause motion. This is a write-only control.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_TILT_RELATIVE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control turns the
camera vertically by the specified amount. The unit is undefined. A
positive value moves the camera up, a negative value down. A value of
zero does not cause motion. This is a write-only control.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PAN_RESET</constant>&nbsp;</entry>
	    <entry>button</entry>
	  </row><row><entry spanname="descr">When this control is set,
the camera moves horizontally to the default position.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_TILT_RESET</constant>&nbsp;</entry>
	    <entry>button</entry>
	  </row><row><entry spanname="descr">When this control is set,
the camera moves vertically to the default position.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PAN_ABSOLUTE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control
turns the camera horizontally to the specified position. Positive
values move the camera to the right (clockwise when viewed from above),
negative values to the left. Drivers should interpret the values as arc
seconds, with valid values between -180 * 3600 and +180 * 3600
inclusive.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_TILT_ABSOLUTE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control
turns the camera vertically to the specified position. Positive values
move the camera up, negative values down. Drivers should interpret the
values as arc seconds, with valid values between -180 * 3600 and +180
* 3600 inclusive.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_FOCUS_ABSOLUTE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control sets the
focal point of the camera to the specified position. The unit is
undefined. Positive values set the focus closer to the camera,
negative values towards infinity.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_FOCUS_RELATIVE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control moves the
focal point of the camera by the specified amount. The unit is
undefined. Positive values move the focus closer to the camera,
negative values towards infinity. This is a write-only control.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_FOCUS_AUTO</constant>&nbsp;</entry>
	    <entry>boolean</entry>
	  </row><row><entry spanname="descr">Enables continuous automatic
focus adjustments. The effect of manual focus adjustments while this feature
is enabled is undefined, drivers should ignore such requests.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_START</constant>&nbsp;</entry>
	    <entry>button</entry>
	  </row><row><entry spanname="descr">Starts single auto focus process.
The effect of setting this control when <constant>V4L2_CID_FOCUS_AUTO</constant>
is set to <constant>TRUE</constant> (1) is undefined, drivers should ignore
such requests.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_STOP</constant>&nbsp;</entry>
	    <entry>button</entry>
	  </row><row><entry spanname="descr">Aborts automatic focusing
started with <constant>V4L2_CID_AUTO_FOCUS_START</constant> control. It is
effective only when the continuous autofocus is disabled, that is when
<constant>V4L2_CID_FOCUS_AUTO</constant> control is set to <constant>FALSE
</constant> (0).</entry>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-auto-focus-status">
	    <entry spanname="id">
	      <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant>&nbsp;</entry>
	    <entry>bitmask</entry>
	  </row>
	  <row><entry spanname="descr">The automatic focus status. This is a read-only
	  control.</entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_STATUS_IDLE</constant>&nbsp;</entry>
		  <entry>Automatic focus is not active.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_STATUS_BUSY</constant>&nbsp;</entry>
		  <entry>Automatic focusing is in progress.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_STATUS_REACHED</constant>&nbsp;</entry>
		  <entry>Focus has been reached.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_STATUS_FAILED</constant>&nbsp;</entry>
		  <entry>Automatic focus has failed, the driver will not
		  transition from this state until another action is
		  performed by an application.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry spanname="descr">
Setting <constant>V4L2_LOCK_FOCUS</constant> lock bit of the <constant>V4L2_CID_3A_LOCK
</constant> control may stop updates of the <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant>
control value.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-auto-focus-range">
	    <entry spanname="id">
	      <constant>V4L2_CID_AUTO_FOCUS_RANGE</constant>&nbsp;</entry>
	    <entry>enum&nbsp;v4l2_auto_focus_range</entry>
	  </row>
	  <row><entry spanname="descr">Determines auto focus distance range
for which lens may be adjusted. </entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_RANGE_AUTO</constant>&nbsp;</entry>
		  <entry>The camera automatically selects the focus range.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_RANGE_NORMAL</constant>&nbsp;</entry>
		  <entry>Normal distance range, limited for best automatic focus
performance.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_RANGE_MACRO</constant>&nbsp;</entry>
		  <entry>Macro (close-up) auto focus. The camera will
use its minimum possible distance for auto focus.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_AUTO_FOCUS_RANGE_INFINITY</constant>&nbsp;</entry>
		  <entry>The lens is set to focus on an object at infinite distance.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_ZOOM_ABSOLUTE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">Specify the objective lens
focal length as an absolute value. The zoom unit is driver-specific and its
value should be a positive integer.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_ZOOM_RELATIVE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">Specify the objective lens
focal length relatively to the current value. Positive values move the zoom
lens group towards the telephoto direction, negative values towards the
wide-angle direction. The zoom unit is driver-specific. This is a write-only control.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_ZOOM_CONTINUOUS</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">Move the objective lens group
at the specified speed until it reaches physical device limits or until an
explicit request to stop the movement. A positive value moves the zoom lens
group towards the telephoto direction. A value of zero stops the zoom lens
group movement. A negative value moves the zoom lens group towards the
wide-angle direction. The zoom speed unit is driver-specific.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_IRIS_ABSOLUTE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control sets the
camera's aperture to the specified value. The unit is undefined.
Larger values open the iris wider, smaller values close it.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_IRIS_RELATIVE</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">This control modifies the
camera's aperture by the specified amount. The unit is undefined.
Positive values open the iris one step further, negative values close
it one step further. This is a write-only control.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PRIVACY</constant>&nbsp;</entry>
	    <entry>boolean</entry>
	  </row><row><entry spanname="descr">Prevent video from being acquired
by the camera. When this control is set to <constant>TRUE</constant> (1), no
image can be captured by the camera. Common means to enforce privacy are
mechanical obturation of the sensor and firmware image processing, but the
device is not restricted to these methods. Devices that implement the privacy
control must support read access and may support write access.</entry>
	  </row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_BAND_STOP_FILTER</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row><row><entry spanname="descr">Switch the band-stop filter of a
camera sensor on or off, or specify its strength. Such band-stop filters can
be used, for example, to filter out the fluorescent light component.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-auto-n-preset-white-balance">
	    <entry spanname="id"><constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant>&nbsp;</entry>
	    <entry>enum&nbsp;v4l2_auto_n_preset_white_balance</entry>
	  </row><row><entry spanname="descr">Sets white balance to automatic,
manual or a preset. The presets determine color temperature of the light as
a hint to the camera for white balance adjustments resulting in most accurate
color representation. The following white balance presets are listed in order
of increasing color temperature.</entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_MANUAL</constant>&nbsp;</entry>
		  <entry>Manual white balance.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_AUTO</constant>&nbsp;</entry>
		  <entry>Automatic white balance adjustments.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant>&nbsp;</entry>
		  <entry>White balance setting for incandescent (tungsten) lighting.
It generally cools down the colors and corresponds approximately to 2500...3500 K
color temperature range.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant>&nbsp;</entry>
		  <entry>White balance preset for fluorescent lighting.
It corresponds approximately to 4000...5000 K color temperature.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant>&nbsp;</entry>
		  <entry>With this setting the camera will compensate for
fluorescent H lighting.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_HORIZON</constant>&nbsp;</entry>
		  <entry>White balance setting for horizon daylight.
It corresponds approximately to 5000 K color temperature.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_DAYLIGHT</constant>&nbsp;</entry>
		  <entry>White balance preset for daylight (with clear sky).
It corresponds approximately to 5000...6500 K color temperature.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_FLASH</constant>&nbsp;</entry>
		  <entry>With this setting the camera will compensate for the flash
light. It slightly warms up the colors and corresponds roughly to 5000...5500 K
color temperature.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_CLOUDY</constant>&nbsp;</entry>
		  <entry>White balance preset for moderately overcast sky.
This option corresponds approximately to 6500...8000 K color temperature
range.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_WHITE_BALANCE_SHADE</constant>&nbsp;</entry>
		  <entry>White balance preset for shade or heavily overcast
sky. It corresponds approximately to 9000...10000 K color temperature.
</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-wide-dynamic-range">
	    <entry spanname="id"><constant>V4L2_CID_WIDE_DYNAMIC_RANGE</constant></entry>
	    <entry>boolean</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Enables or disables the camera's wide dynamic
range feature. This feature allows to obtain clear images in situations where
intensity of the illumination varies significantly throughout the scene, i.e.
there are simultaneously very dark and very bright areas. It is most commonly
realized in cameras by combining two subsequent frames with different exposure
times. <footnote id="ctypeconv"><para> This control may be changed to a menu
control in the future, if more options are required.</para></footnote></entry>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-image-stabilization">
	    <entry spanname="id"><constant>V4L2_CID_IMAGE_STABILIZATION</constant></entry>
	    <entry>boolean</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Enables or disables image stabilization.
	      <footnoteref linkend="ctypeconv"/></entry>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY</constant>&nbsp;</entry>
	    <entry>integer menu</entry>
	  </row><row><entry spanname="descr">Determines ISO equivalent of an
image sensor indicating the sensor's sensitivity to light. The numbers are
expressed in arithmetic scale, as per <xref linkend="iso12232" /> standard,
where doubling the sensor sensitivity is represented by doubling the numerical
ISO value. Applications should interpret the values as standard ISO values
multiplied by 1000, e.g. control value 800 stands for ISO 0.8. Drivers will
usually support only a subset of standard ISO values. The effect of setting
this control while the <constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>
control is set to a value other than <constant>V4L2_CID_ISO_SENSITIVITY_MANUAL
</constant> is undefined, drivers should ignore such requests.</entry>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-iso-sensitivity-auto-type">
	    <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>&nbsp;</entry>
	    <entry>enum&nbsp;v4l2_iso_sensitivity_type</entry>
	  </row><row><entry spanname="descr">Enables or disables automatic ISO
sensitivity adjustments.</entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_CID_ISO_SENSITIVITY_MANUAL</constant>&nbsp;</entry>
		  <entry>Manual ISO sensitivity.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>&nbsp;</entry>
		  <entry>Automatic ISO sensitivity adjustments.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry></entry></row>

	  <row id="v4l2-scene-mode">
	    <entry spanname="id"><constant>V4L2_CID_SCENE_MODE</constant>&nbsp;</entry>
	    <entry>enum&nbsp;v4l2_scene_mode</entry>
	  </row><row><entry spanname="descr">This control allows to select
scene programs as the camera automatic modes optimized for common shooting
scenes. Within these modes the camera determines best exposure, aperture,
focusing, light metering, white balance and equivalent sensitivity. The
controls of those parameters are influenced by the scene mode control.
An exact behavior in each mode is subject to the camera specification.

<para>When the scene mode feature is not used, this control should be set to
<constant>V4L2_SCENE_MODE_NONE</constant> to make sure the other possibly
related controls are accessible. The following scene programs are defined:
</para>
</entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_SCENE_MODE_NONE</constant>&nbsp;</entry>
		  <entry>The scene mode feature is disabled.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_BACKLIGHT</constant>&nbsp;</entry>
		  <entry>Backlight. Compensates for dark shadows when light is
		  coming from behind a subject, also by automatically turning
		  on the flash.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_BEACH_SNOW</constant>&nbsp;</entry>
		  <entry>Beach and snow. This mode compensates for all-white or
bright scenes, which tend to look gray and low contrast, when camera's automatic
exposure is based on an average scene brightness. To compensate, this mode
automatically slightly overexposes the frames. The white balance may also be
adjusted to compensate for the fact that reflected snow looks bluish rather
than white.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_CANDLELIGHT</constant>&nbsp;</entry>
		  <entry>Candle light. The camera generally raises the ISO
sensitivity and lowers the shutter speed. This mode compensates for relatively
close subject in the scene. The flash is disabled in order to preserve the
ambiance of the light.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_DAWN_DUSK</constant>&nbsp;</entry>
		  <entry>Dawn and dusk. Preserves the colors seen in low
natural light before dusk and after down. The camera may turn off the flash,
and automatically focus at infinity. It will usually boost saturation and
lower the shutter speed.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_FALL_COLORS</constant>&nbsp;</entry>
		  <entry>Fall colors. Increases saturation and adjusts white
balance for color enhancement. Pictures of autumn leaves get saturated reds
and yellows.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_FIREWORKS</constant>&nbsp;</entry>
		  <entry>Fireworks. Long exposure times are used to capture
the expanding burst of light from a firework. The camera may invoke image
stabilization.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_LANDSCAPE</constant>&nbsp;</entry>
		  <entry>Landscape. The camera may choose a small aperture to
provide deep depth of field and long exposure duration to help capture detail
in dim light conditions. The focus is fixed at infinity. Suitable for distant
and wide scenery.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_NIGHT</constant>&nbsp;</entry>
		  <entry>Night, also known as Night Landscape. Designed for low
light conditions, it preserves detail in the dark areas without blowing out bright
objects. The camera generally sets itself to a medium-to-high ISO sensitivity,
with a relatively long exposure time, and turns flash off. As such, there will be
increased image noise and the possibility of blurred image.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_PARTY_INDOOR</constant>&nbsp;</entry>
		  <entry>Party and indoor. Designed to capture indoor scenes
that are lit by indoor background lighting as well as the flash. The camera
usually increases ISO sensitivity, and adjusts exposure for the low light
conditions.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_PORTRAIT</constant>&nbsp;</entry>
		  <entry>Portrait. The camera adjusts the aperture so that the
depth of field is reduced, which helps to isolate the subject against a smooth
background. Most cameras recognize the presence of faces in the scene and focus
on them. The color hue is adjusted to enhance skin tones. The intensity of the
flash is often reduced.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_SPORTS</constant>&nbsp;</entry>
		  <entry>Sports. Significantly increases ISO and uses a fast
shutter speed to freeze motion of rapidly-moving subjects. Increased image
noise may be seen in this mode.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_SUNSET</constant>&nbsp;</entry>
		  <entry>Sunset. Preserves deep hues seen in sunsets and
sunrises. It bumps up the saturation.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_SCENE_MODE_TEXT</constant>&nbsp;</entry>
		  <entry>Text. It applies extra contrast and sharpness, it is
typically a black-and-white mode optimized for readability. Automatic focus
may be switched to close-up mode and this setting may also involve some
lens-distortion correction.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry></entry></row>

	  <row>
	    <entry spanname="id"><constant>V4L2_CID_3A_LOCK</constant></entry>
	    <entry>bitmask</entry>
	  </row>
	  <row>
	    <entry spanname="descr">This control locks or unlocks the automatic
focus, exposure and white balance. The automatic adjustments can be paused
independently by setting the corresponding lock bit to 1. The camera then retains
the settings until the lock bit is cleared. The following lock bits are defined:
</entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_LOCK_EXPOSURE</constant></entry>
		  <entry>Automatic exposure adjustments lock.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_LOCK_WHITE_BALANCE</constant></entry>
		  <entry>Automatic white balance adjustments lock.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_LOCK_FOCUS</constant></entry>
		  <entry>Automatic focus lock.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry spanname="descr">
When a given algorithm is not enabled, drivers should ignore requests
to lock it and should return no error. An example might be an application
setting bit <constant>V4L2_LOCK_WHITE_BALANCE</constant> when the
<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant> control is set to
<constant>FALSE</constant>. The value of this control may be changed
by exposure, white balance or focus controls.</entry>
	  </row>
	  <row><entry></entry></row>

	</tbody>
      </tgroup>
    </table>
  </section>

    <section id="fm-tx-controls">
      <title>FM Transmitter Control Reference</title>

      <para>The FM Transmitter (FM_TX) class includes controls for common features of
FM transmissions capable devices. Currently this class includes parameters for audio
compression, pilot tone generation, audio deviation limiter, RDS transmission and
tuning power features.</para>

      <table pgwide="1" frame="none" id="fm-tx-control-id">
      <title>FM_TX Control IDs</title>

      <tgroup cols="4">
	<colspec colname="c1" colwidth="1*" />
	<colspec colname="c2" colwidth="6*" />
	<colspec colname="c3" colwidth="2*" />
	<colspec colname="c4" colwidth="6*" />
	<spanspec namest="c1" nameend="c2" spanname="id" />
	<spanspec namest="c2" nameend="c4" spanname="descr" />
	<thead>
	  <row>
	    <entry spanname="id" align="left">ID</entry>
	    <entry align="left">Type</entry>
	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row><entry></entry></row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_FM_TX_CLASS</constant>&nbsp;</entry>
	    <entry>class</entry>
	  </row><row><entry spanname="descr">The FM_TX class
descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
description of this control class.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_RDS_TX_DEVIATION</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Configures RDS signal frequency deviation level in Hz.
The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_RDS_TX_PI</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the RDS Programme Identification field
for transmission.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_RDS_TX_PTY</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the RDS Programme Type field for transmission.
This encodes up to 31 pre-defined programme types.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_RDS_TX_PS_NAME</constant>&nbsp;</entry>
	    <entry>string</entry>
	  </row>
	  <row><entry spanname="descr">Sets the Programme Service name (PS_NAME) for transmission.
It is intended for static display on a receiver. It is the primary aid to listeners in programme service
identification and selection.  In Annex E of <xref linkend="iec62106" />, the RDS specification,
there is a full description of the correct character encoding for Programme Service name strings.
Also from RDS specification, PS is usually a single eight character text. However, it is also possible
to find receivers which can scroll strings sized as 8 x N characters. So, this control must be configured
with steps of 8 characters. The result is it must always contain a string with size multiple of 8.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_RDS_TX_RADIO_TEXT</constant>&nbsp;</entry>
	    <entry>string</entry>
	  </row>
	  <row><entry spanname="descr">Sets the Radio Text info for transmission. It is a textual description of
what is being broadcasted. RDS Radio Text can be applied when broadcaster wishes to transmit longer PS names,
programme-related information or any other text. In these cases, RadioText should be used in addition to
<constant>V4L2_CID_RDS_TX_PS_NAME</constant>. The encoding for Radio Text strings is also fully described
in Annex E of <xref linkend="iec62106" />. The length of Radio Text strings depends on which RDS Block is being
used to transmit it, either 32 (2A block) or 64 (2B block).  However, it is also possible
to find receivers which can scroll strings sized as 32 x N or 64 x N characters. So, this control must be configured
with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_ENABLED</constant>&nbsp;</entry>
	    <entry>boolean</entry>
	  </row>
	  <row><entry spanname="descr">Enables or disables the audio deviation limiter feature.
The limiter is useful when trying to maximize the audio volume, minimize receiver-generated
distortion and prevent overmodulation.
</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_RELEASE_TIME</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the audio deviation limiter feature release time.
Unit is in useconds. Step and range are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_DEVIATION</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Configures audio frequency deviation level in Hz.
The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ENABLED</constant>&nbsp;</entry>
	    <entry>boolean</entry>
	  </row>
	  <row><entry spanname="descr">Enables or disables the audio compression feature.
This feature amplifies signals below the threshold by a fixed gain and compresses audio
signals above the threshold by the ratio of Threshold/(Gain + Threshold).</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_GAIN</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the gain for audio compression feature. It is
a dB value. The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_THRESHOLD</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the threshold level for audio compression freature.
It is a dB value. The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the attack time for audio compression feature.
It is a useconds value. The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the release time for audio compression feature.
It is a useconds value. The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_ENABLED</constant>&nbsp;</entry>
	    <entry>boolean</entry>
	  </row>
	  <row><entry spanname="descr">Enables or disables the pilot tone generation feature.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_DEVIATION</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Configures pilot tone frequency deviation level. Unit is
in Hz. The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_FREQUENCY</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Configures pilot tone frequency value. Unit is
in Hz. The range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_TUNE_PREEMPHASIS</constant>&nbsp;</entry>
	    <entry>enum v4l2_preemphasis</entry>
	  </row>
	  <row id="v4l2-preemphasis"><entry spanname="descr">Configures the pre-emphasis value for broadcasting.
A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies.
Depending on the region, a time constant of either 50 or 75 useconds is used. The enum&nbsp;v4l2_preemphasis
defines possible values for pre-emphasis. Here they are:</entry>
	</row><row>
	<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_PREEMPHASIS_DISABLED</constant>&nbsp;</entry>
		      <entry>No pre-emphasis is applied.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_PREEMPHASIS_50_uS</constant>&nbsp;</entry>
		      <entry>A pre-emphasis of 50 uS is used.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_PREEMPHASIS_75_uS</constant>&nbsp;</entry>
		      <entry>A pre-emphasis of 75 uS is used.</entry>
		    </row>
		  </tbody>
		</entrytbl>

	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_TUNE_POWER_LEVEL</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">Sets the output power level for signal transmission.
Unit is in dBuV. Range and step are driver-specific.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_TUNE_ANTENNA_CAPACITOR</constant>&nbsp;</entry>
	    <entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">This selects the value of antenna tuning capacitor
manually or automatically if set to zero. Unit, range and step are driver-specific.</entry>
	  </row>
	  <row><entry></entry></row>
	</tbody>
      </tgroup>
      </table>

<para>For more details about RDS specification, refer to
<xref linkend="iec62106" /> document, from CENELEC.</para>
    </section>

    <section id="flash-controls">
      <title>Flash Control Reference</title>

      <note>
	<title>Experimental</title>

	<para>This is an <link linkend="experimental">experimental</link>
interface and may change in the future.</para>
      </note>

      <para>
	The V4L2 flash controls are intended to provide generic access
	to flash controller devices. Flash controller devices are
	typically used in digital cameras.
      </para>

      <para>
	The interface can support both LED and xenon flash devices. As
	of writing this, there is no xenon flash driver using this
	interface.
      </para>

      <section id="flash-controls-use-cases">
	<title>Supported use cases</title>

	<section>
	  <title>Unsynchronised LED flash (software strobe)</title>

	  <para>
	    Unsynchronised LED flash is controlled directly by the
	    host as the sensor. The flash must be enabled by the host
	    before the exposure of the image starts and disabled once
	    it ends. The host is fully responsible for the timing of
	    the flash.
	  </para>

	  <para>Example of such device: Nokia N900.</para>
	</section>

	<section>
	  <title>Synchronised LED flash (hardware strobe)</title>

	  <para>
	    The synchronised LED flash is pre-programmed by the host
	    (power and timeout) but controlled by the sensor through a
	    strobe signal from the sensor to the flash.
	  </para>

	  <para>
	    The sensor controls the flash duration and timing. This
	    information typically must be made available to the
	    sensor.
	  </para>

	</section>

	<section>
	  <title>LED flash as torch</title>

	  <para>
	    LED flash may be used as torch in conjunction with another
	    use case involving camera or individually.
	  </para>


          <table pgwide="1" frame="none" id="flash-control-id">
          <title>Flash Control IDs</title>
    
          <tgroup cols="4">
    	<colspec colname="c1" colwidth="1*" />
    	<colspec colname="c2" colwidth="6*" />
    	<colspec colname="c3" colwidth="2*" />
    	<colspec colname="c4" colwidth="6*" />
    	<spanspec namest="c1" nameend="c2" spanname="id" />
    	<spanspec namest="c2" nameend="c4" spanname="descr" />
    	<thead>
    	  <row>
    	    <entry spanname="id" align="left">ID</entry>
    	    <entry align="left">Type</entry>
    	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
    	  </row>
    	</thead>
    	<tbody valign="top">
    	  <row><entry></entry></row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_CLASS</constant></entry>
    	    <entry>class</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">The FLASH class descriptor.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_LED_MODE</constant></entry>
    	    <entry>menu</entry>
    	  </row>
    	  <row id="v4l2-flash-led-mode">
    	    <entry spanname="descr">Defines the mode of the flash LED,
    	    the high-power white LED attached to the flash controller.
    	    Setting this control may not be possible in presence of
    	    some faults. See V4L2_CID_FLASH_FAULT.</entry>
    	  </row>
    	  <row>
    	    <entrytbl spanname="descr" cols="2">
    	      <tbody valign="top">
    		<row>
    		  <entry><constant>V4L2_FLASH_LED_MODE_NONE</constant></entry>
    		  <entry>Off.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_LED_MODE_FLASH</constant></entry>
    		  <entry>Flash mode.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_LED_MODE_TORCH</constant></entry>
    		  <entry>Torch mode. See V4L2_CID_FLASH_TORCH_INTENSITY.</entry>
    		</row>
    	      </tbody>
    	    </entrytbl>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_SOURCE</constant></entry>
    	    <entry>menu</entry>
    	  </row>
    	  <row id="v4l2-flash-strobe-source"><entry
    	  spanname="descr">Defines the source of the flash LED
    	  strobe.</entry>
    	  </row>
    	  <row>
    	    <entrytbl spanname="descr" cols="2">
    	      <tbody valign="top">
    		<row>
    		  <entry><constant>V4L2_FLASH_STROBE_SOURCE_SOFTWARE</constant></entry>
    		  <entry>The flash strobe is triggered by using
    		  the V4L2_CID_FLASH_STROBE control.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_STROBE_SOURCE_EXTERNAL</constant></entry>
    		  <entry>The flash strobe is triggered by an
    		  external source. Typically this is a sensor,
    		  which makes it possible to synchronises the
    		  flash strobe start to exposure start.</entry>
    		</row>
    	      </tbody>
    	    </entrytbl>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE</constant></entry>
    	    <entry>button</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Strobe flash. Valid when
    	    V4L2_CID_FLASH_LED_MODE is set to
    	    V4L2_FLASH_LED_MODE_FLASH and V4L2_CID_FLASH_STROBE_SOURCE
    	    is set to V4L2_FLASH_STROBE_SOURCE_SOFTWARE. Setting this
    	    control may not be possible in presence of some faults.
    	    See V4L2_CID_FLASH_FAULT.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STOP</constant></entry>
    	    <entry>button</entry>
    	  </row>
    	  <row><entry spanname="descr">Stop flash strobe immediately.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STATUS</constant></entry>
    	    <entry>boolean</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Strobe status: whether the flash
    	    is strobing at the moment or not. This is a read-only
    	    control.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_TIMEOUT</constant></entry>
    	    <entry>integer</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Hardware timeout for flash. The
    	    flash strobe is stopped after this period of time has
    	    passed from the start of the strobe.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_INTENSITY</constant></entry>
    	    <entry>integer</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Intensity of the flash strobe when
    	    the flash LED is in flash mode
    	    (V4L2_FLASH_LED_MODE_FLASH). The unit should be milliamps
    	    (mA) if possible.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_TORCH_INTENSITY</constant></entry>
    	    <entry>integer</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Intensity of the flash LED in
    	    torch mode (V4L2_FLASH_LED_MODE_TORCH). The unit should be
    	    milliamps (mA) if possible. Setting this control may not
    	    be possible in presence of some faults. See
    	    V4L2_CID_FLASH_FAULT.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_INDICATOR_INTENSITY</constant></entry>
    	    <entry>integer</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Intensity of the indicator LED.
    	    The indicator LED may be fully independent of the flash
    	    LED. The unit should be microamps (uA) if possible.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_FAULT</constant></entry>
    	    <entry>bitmask</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Faults related to the flash. The
    	    faults tell about specific problems in the flash chip
    	    itself or the LEDs attached to it. Faults may prevent
    	    further use of some of the flash controls. In particular,
    	    V4L2_CID_FLASH_LED_MODE is set to V4L2_FLASH_LED_MODE_NONE
    	    if the fault affects the flash LED. Exactly which faults
    	    have such an effect is chip dependent. Reading the faults
    	    resets the control and returns the chip to a usable state
    	    if possible.</entry>
    	  </row>
    	  <row>
    	    <entrytbl spanname="descr" cols="2">
    	      <tbody valign="top">
    		<row>
    		  <entry><constant>V4L2_FLASH_FAULT_OVER_VOLTAGE</constant></entry>
    		  <entry>Flash controller voltage to the flash LED
    		  has exceeded the limit specific to the flash
    		  controller.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_FAULT_TIMEOUT</constant></entry>
    		  <entry>The flash strobe was still on when
    		  the timeout set by the user ---
    		  V4L2_CID_FLASH_TIMEOUT control --- has expired.
    		  Not all flash controllers may set this in all
    		  such conditions.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_FAULT_OVER_TEMPERATURE</constant></entry>
    		  <entry>The flash controller has overheated.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_FAULT_SHORT_CIRCUIT</constant></entry>
    		  <entry>The short circuit protection of the flash
    		  controller has been triggered.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_FAULT_OVER_CURRENT</constant></entry>
    		  <entry>Current in the LED power supply has exceeded the limit
    		  specific to the flash controller.</entry>
    		</row>
    		<row>
    		  <entry><constant>V4L2_FLASH_FAULT_INDICATOR</constant></entry>
    		  <entry>The flash controller has detected a short or open
    		  circuit condition on the indicator LED.</entry>
    		</row>
    	      </tbody>
    	    </entrytbl>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_CHARGE</constant></entry>
    	    <entry>boolean</entry>
    	  </row>
    	  <row><entry spanname="descr">Enable or disable charging of the xenon
    	  flash capacitor.</entry>
    	  </row>
    	  <row>
    	    <entry spanname="id"><constant>V4L2_CID_FLASH_READY</constant></entry>
    	    <entry>boolean</entry>
    	  </row>
    	  <row>
    	    <entry spanname="descr">Is the flash ready to strobe?
    	    Xenon flashes require their capacitors charged before
    	    strobing. LED flashes often require a cooldown period
    	    after strobe during which another strobe will not be
    	    possible. This is a read-only control.</entry>
    	  </row>
    	  <row><entry></entry></row>
    	</tbody>
          </tgroup>
          </table>
	</section>
      </section>
    </section>

    <section id="jpeg-controls">
      <title>JPEG Control Reference</title>
      <para>The JPEG class includes controls for common features of JPEG
      encoders and decoders. Currently it includes features for codecs
      implementing progressive baseline DCT compression process with
      Huffman entrophy coding.</para>
      <table pgwide="1" frame="none" id="jpeg-control-id">
      <title>JPEG Control IDs</title>

      <tgroup cols="4">
	<colspec colname="c1" colwidth="1*" />
	<colspec colname="c2" colwidth="6*" />
	<colspec colname="c3" colwidth="2*" />
	<colspec colname="c4" colwidth="6*" />
	<spanspec namest="c1" nameend="c2" spanname="id" />
	<spanspec namest="c2" nameend="c4" spanname="descr" />
	<thead>
	  <row>
	    <entry spanname="id" align="left">ID</entry>
	    <entry align="left">Type</entry>
	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row><entry></entry></row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_JPEG_CLASS</constant>&nbsp;</entry>
	    <entry>class</entry>
	  </row><row><entry spanname="descr">The JPEG class descriptor. Calling
	  &VIDIOC-QUERYCTRL; for this control will return a description of this
	  control class.

	</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant></entry>
	    <entry>menu</entry>
	  </row>
	  <row id="v4l2-jpeg-chroma-subsampling">
	    <entry spanname="descr">The chroma subsampling factors describe how
	    each component of an input image is sampled, in respect to maximum
	    sample rate in each spatial dimension. See <xref linkend="itu-t81"/>,
	    clause A.1.1. for more details. The <constant>
	    V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant> control determines how
	    Cb and Cr components are downsampled after coverting an input image
	    from RGB to Y'CbCr color space.
	    </entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_444</constant>
		  </entry><entry>No chroma subsampling, each pixel has
		  Y, Cr and Cb values.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_422</constant>
		  </entry><entry>Horizontally subsample Cr, Cb components
		  by a factor of 2.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_420</constant>
		  </entry><entry>Subsample Cr, Cb components horizontally
		  and vertically by 2.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_411</constant>
		  </entry><entry>Horizontally subsample Cr, Cb components
		  by a factor of 4.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_410</constant>
		  </entry><entry>Subsample Cr, Cb components horizontally
		  by 4 and vertically by 2.</entry>
		</row>
		<row>
		  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY</constant>
		  </entry><entry>Use only luminance component.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_JPEG_RESTART_INTERVAL</constant>
	    </entry><entry>integer</entry>
	  </row>
	  <row><entry spanname="descr">
	      The restart interval determines an interval of inserting RSTm
	      markers (m = 0..7). The purpose of these markers is to additionally
	      reinitialize the encoder process, in order to process blocks of
	      an image independently.
	      For the lossy compression processes the restart interval unit is
	      MCU (Minimum Coded Unit) and its value is contained in DRI
	      (Define Restart Interval) marker. If <constant>
	      V4L2_CID_JPEG_RESTART_INTERVAL</constant> control is set to 0,
	      DRI and RSTm markers will not be inserted.
	    </entry>
	  </row>
	  <row id="jpeg-quality-control">
	    <entry spanname="id"><constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant></entry>
	    <entry>integer</entry>
	  </row>
	  <row>
	    <entry spanname="descr">
	      <constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control
	      determines trade-off between image quality and size.
	      It provides simpler method for applications to control image quality,
	      without a need for direct reconfiguration of luminance and chrominance
	      quantization tables.

	      In cases where a driver uses quantization tables configured directly
	      by an application, using interfaces defined elsewhere, <constant>
	      V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control should be set
	      by driver to 0.

	      <para>The value range of this control is driver-specific. Only
	      positive, non-zero values are meaningful. The recommended range
	      is 1 - 100, where larger values correspond to better image quality.
	      </para>
	    </entry>
	    </row>
	  <row id="jpeg-active-marker-control">
	    <entry spanname="id"><constant>V4L2_CID_JPEG_ACTIVE_MARKER</constant></entry>
	    <entry>bitmask</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Specify which JPEG markers are included
	    in compressed stream. This control is valid only for encoders.
	    </entry>
	  </row>
	  <row>
	    <entrytbl spanname="descr" cols="2">
	      <tbody valign="top">
		<row>
		  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP0</constant></entry>
		  <entry>Application data segment APP<subscript>0</subscript>.</entry>
		</row><row>
		  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP1</constant></entry>
		  <entry>Application data segment APP<subscript>1</subscript>.</entry>
		</row><row>
		  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_COM</constant></entry>
		  <entry>Comment segment.</entry>
		</row><row>
		  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DQT</constant></entry>
		  <entry>Quantization tables segment.</entry>
		</row><row>
		  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DHT</constant></entry>
		  <entry>Huffman tables segment.</entry>
		</row>
	      </tbody>
	    </entrytbl>
	  </row>
	  <row><entry></entry></row>
	</tbody>
      </tgroup>
      </table>
      <para>For more details about JPEG specification, refer
      to <xref linkend="itu-t81"/>, <xref linkend="jfif"/>,
      <xref linkend="w3c-jpeg-jfif"/>.</para>
    </section>

    <section id="image-source-controls">
      <title>Image Source Control Reference</title>

      <note>
	<title>Experimental</title>

	<para>This is an <link
	linkend="experimental">experimental</link> interface and may
	change in the future.</para>
      </note>

      <para>
	The Image Source control class is intended for low-level
	control of image source devices such as image sensors. The
	devices feature an analogue to digital converter and a bus
	transmitter to transmit the image data out of the device.
      </para>

      <table pgwide="1" frame="none" id="image-source-control-id">
      <title>Image Source Control IDs</title>

      <tgroup cols="4">
	<colspec colname="c1" colwidth="1*" />
	<colspec colname="c2" colwidth="6*" />
	<colspec colname="c3" colwidth="2*" />
	<colspec colname="c4" colwidth="6*" />
	<spanspec namest="c1" nameend="c2" spanname="id" />
	<spanspec namest="c2" nameend="c4" spanname="descr" />
	<thead>
	  <row>
	    <entry spanname="id" align="left">ID</entry>
	    <entry align="left">Type</entry>
	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row><entry></entry></row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant></entry>
	    <entry>class</entry>
	  </row>
	  <row>
	    <entry spanname="descr">The IMAGE_SOURCE class descriptor.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_VBLANK</constant></entry>
	    <entry>integer</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Vertical blanking. The idle period
	    after every frame during which no image data is produced.
	    The unit of vertical blanking is a line. Every line has
	    length of the image width plus horizontal blanking at the
	    pixel rate defined by
	    <constant>V4L2_CID_PIXEL_RATE</constant> control in the
	    same sub-device.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_HBLANK</constant></entry>
	    <entry>integer</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Horizontal blanking. The idle
	    period after every line of image data during which no
	    image data is produced. The unit of horizontal blanking is
	    pixels.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_ANALOGUE_GAIN</constant></entry>
	    <entry>integer</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Analogue gain is gain affecting
	    all colour components in the pixel matrix. The gain
	    operation is performed in the analogue domain before A/D
	    conversion.
	    </entry>
	  </row>
	  <row><entry></entry></row>
	</tbody>
      </tgroup>
      </table>

    </section>

    <section id="image-process-controls">
      <title>Image Process Control Reference</title>

      <note>
	<title>Experimental</title>

	<para>This is an <link
	linkend="experimental">experimental</link> interface and may
	change in the future.</para>
      </note>

      <para>
	The Image Source control class is intended for low-level control of
	image processing functions. Unlike
	<constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant>, the controls in
	this class affect processing the image, and do not control capturing
	of it.
      </para>

      <table pgwide="1" frame="none" id="image-process-control-id">
      <title>Image Source Control IDs</title>

      <tgroup cols="4">
	<colspec colname="c1" colwidth="1*" />
	<colspec colname="c2" colwidth="6*" />
	<colspec colname="c3" colwidth="2*" />
	<colspec colname="c4" colwidth="6*" />
	<spanspec namest="c1" nameend="c2" spanname="id" />
	<spanspec namest="c2" nameend="c4" spanname="descr" />
	<thead>
	  <row>
	    <entry spanname="id" align="left">ID</entry>
	    <entry align="left">Type</entry>
	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row><entry></entry></row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_IMAGE_PROC_CLASS</constant></entry>
	    <entry>class</entry>
	  </row>
	  <row>
	    <entry spanname="descr">The IMAGE_PROC class descriptor.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_LINK_FREQ</constant></entry>
	    <entry>integer menu</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Data bus frequency. Together with the
	    media bus pixel code, bus type (clock cycles per sample), the
	    data bus frequency defines the pixel rate
	    (<constant>V4L2_CID_PIXEL_RATE</constant>) in the
	    pixel array (or possibly elsewhere, if the device is not an
	    image sensor). The frame rate can be calculated from the pixel
	    clock, image width and height and horizontal and vertical
	    blanking. While the pixel rate control may be defined elsewhere
	    than in the subdev containing the pixel array, the frame rate
	    cannot be obtained from that information. This is because only
	    on the pixel array it can be assumed that the vertical and
	    horizontal blanking information is exact: no other blanking is
	    allowed in the pixel array. The selection of frame rate is
	    performed by selecting the desired horizontal and vertical
	    blanking. The unit of this control is Hz. </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_PIXEL_RATE</constant></entry>
	    <entry>64-bit integer</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Pixel rate in the source pads of
	    the subdev. This control is read-only and its unit is
	    pixels / second.
	    </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN</constant></entry>
	    <entry>menu</entry>
	  </row>
	  <row id="v4l2-test-pattern">
	    <entry spanname="descr"> Some capture/display/sensor devices have
	    the capability to generate test pattern images. These hardware
	    specific test patterns can be used to test if a device is working
	    properly.</entry>
	  </row>
	  <row><entry></entry></row>
	</tbody>
      </tgroup>
      </table>

    </section>

    <section id="dv-controls">
      <title>Digital Video Control Reference</title>

      <note>
	<title>Experimental</title>

	<para>This is an <link
	linkend="experimental">experimental</link> interface and may
	change in the future.</para>
      </note>

      <para>
	The Digital Video control class is intended to control receivers
	and transmitters for <ulink url="http://en.wikipedia.org/wiki/Vga">VGA</ulink>,
	<ulink url="http://en.wikipedia.org/wiki/Digital_Visual_Interface">DVI</ulink>
	(Digital Visual Interface), HDMI (<xref linkend="hdmi" />) and DisplayPort (<xref linkend="dp" />).
	These controls are generally expected to be private to the receiver or transmitter
	subdevice that implements them, so they are only exposed on the
	<filename>/dev/v4l-subdev*</filename> device node.
      </para>

      <para>Note that these devices can have multiple input or output pads which are
      hooked up to e.g. HDMI connectors. Even though the subdevice will receive or
      transmit video from/to only one of those pads, the other pads can still be
      active when it comes to EDID (Extended Display Identification Data,
      <xref linkend="vesaedid" />) and HDCP (High-bandwidth Digital Content
      Protection System, <xref linkend="hdcp" />) processing, allowing the device
      to do the fairly slow EDID/HDCP handling in advance. This allows for quick
      switching between connectors.</para>

      <para>These pads appear in several of the controls in this section as
      bitmasks, one bit for each pad. Bit 0 corresponds to pad 0, bit 1 to pad 1,
      etc. The maximum value of the control is the set of valid pads.</para>

      <table pgwide="1" frame="none" id="dv-control-id">
      <title>Digital Video Control IDs</title>

      <tgroup cols="4">
	<colspec colname="c1" colwidth="1*" />
	<colspec colname="c2" colwidth="6*" />
	<colspec colname="c3" colwidth="2*" />
	<colspec colname="c4" colwidth="6*" />
	<spanspec namest="c1" nameend="c2" spanname="id" />
	<spanspec namest="c2" nameend="c4" spanname="descr" />
	<thead>
	  <row>
	    <entry spanname="id" align="left">ID</entry>
	    <entry align="left">Type</entry>
	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
	  </row>
	</thead>
	<tbody valign="top">
	  <row><entry></entry></row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_CLASS</constant></entry>
	    <entry>class</entry>
	  </row>
	  <row>
	    <entry spanname="descr">The Digital Video class descriptor.</entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_TX_HOTPLUG</constant></entry>
	    <entry>bitmask</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Many connectors have a hotplug pin which is high
	    if EDID information is available from the source. This control shows the
	    state of the hotplug pin as seen by the transmitter.
	    Each bit corresponds to an output pad on the transmitter. If an output pad
	    does not have an associated hotplug pin, then the bit for that pad will be 0.
	    This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors.
	    </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_TX_RXSENSE</constant></entry>
	    <entry>bitmask</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Rx Sense is the detection of pull-ups on the TMDS
            clock lines. This normally means that the sink has left/entered standby (i.e.
	    the transmitter can sense that the receiver is ready to receive video).
	    Each bit corresponds to an output pad on the transmitter. If an output pad
	    does not have an associated Rx Sense, then the bit for that pad will be 0.
	    This read-only control is applicable to DVI-D and HDMI devices.
	    </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_TX_EDID_PRESENT</constant></entry>
	    <entry>bitmask</entry>
	  </row>
	  <row>
	    <entry spanname="descr">When the transmitter sees the hotplug signal from the
	    receiver it will attempt to read the EDID. If set, then the transmitter has read
	    at least the first block (= 128 bytes).
	    Each bit corresponds to an output pad on the transmitter. If an output pad
	    does not support EDIDs, then the bit for that pad will be 0.
	    This read-only control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
	    </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_TX_MODE</constant></entry>
	    <entry id="v4l2-dv-tx-mode">enum v4l2_dv_tx_mode</entry>
	  </row>
	  <row>
	    <entry spanname="descr">HDMI transmitters can transmit in DVI-D mode (just video)
	    or in HDMI mode (video + audio + auxiliary data). This control selects which mode
	    to use: V4L2_DV_TX_MODE_DVI_D or V4L2_DV_TX_MODE_HDMI.
	    This control is applicable to HDMI connectors.
	    </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_TX_RGB_RANGE</constant></entry>
	    <entry id="v4l2-dv-rgb-range">enum v4l2_dv_rgb_range</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Select the quantization range for RGB output. V4L2_DV_RANGE_AUTO
	    follows the RGB quantization range specified in the standard for the video interface
	    (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard
	    to be compatible with sinks that have not implemented the standard correctly
	    (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be
	    used whereas limited range sets the range to (16 &lt;&lt; (N-8)) - (235 &lt;&lt; (N-8))
	    where N is the number of bits per component.
	    This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
	    </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_RX_POWER_PRESENT</constant></entry>
	    <entry>bitmask</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Detects whether the receiver receives power from the source
	    (e.g. HDMI carries 5V on one of the pins). This is often used to power an eeprom
	    which contains EDID information, such that the source can read the EDID even if
	    the sink is in standby/power off.
	    Each bit corresponds to an input pad on the transmitter. If an input pad
	    cannot detect whether power is present, then the bit for that pad will be 0.
	    This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors.
	    </entry>
	  </row>
	  <row>
	    <entry spanname="id"><constant>V4L2_CID_DV_RX_RGB_RANGE</constant></entry>
	    <entry>enum v4l2_dv_rgb_range</entry>
	  </row>
	  <row>
	    <entry spanname="descr">Select the quantization range for RGB input. V4L2_DV_RANGE_AUTO
	    follows the RGB quantization range specified in the standard for the video interface
	    (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard
	    to be compatible with sources that have not implemented the standard correctly
	    (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be
	    used whereas limited range sets the range to (16 &lt;&lt; (N-8)) - (235 &lt;&lt; (N-8))
	    where N is the number of bits per component.
	    This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
	    </entry>
	  </row>
	  <row><entry></entry></row>
	</tbody>
      </tgroup>
      </table>

    </section>

    <section id="fm-rx-controls">
      <title>FM Receiver Control Reference</title>

      <para>The FM Receiver (FM_RX) class includes controls for common features of
      FM Reception capable devices.</para>

      <table pgwide="1" frame="none" id="fm-rx-control-id">
      <title>FM_RX Control IDs</title>

      <tgroup cols="4">
        <colspec colname="c1" colwidth="1*" />
        <colspec colname="c2" colwidth="6*" />
        <colspec colname="c3" colwidth="2*" />
        <colspec colname="c4" colwidth="6*" />
        <spanspec namest="c1" nameend="c2" spanname="id" />
        <spanspec namest="c2" nameend="c4" spanname="descr" />
        <thead>
          <row>
            <entry spanname="id" align="left">ID</entry>
            <entry align="left">Type</entry>
          </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
          </row>
        </thead>
        <tbody valign="top">
          <row><entry></entry></row>
          <row>
            <entry spanname="id"><constant>V4L2_CID_FM_RX_CLASS</constant>&nbsp;</entry>
            <entry>class</entry>
          </row><row><entry spanname="descr">The FM_RX class
descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
description of this control class.</entry>
          </row>
          <row>
            <entry spanname="id"><constant>V4L2_CID_RDS_RECEPTION</constant>&nbsp;</entry>
            <entry>boolean</entry>
          </row><row><entry spanname="descr">Enables/disables RDS
	  reception by the radio tuner</entry>
          </row>
          <row>
	    <entry spanname="id"><constant>V4L2_CID_TUNE_DEEMPHASIS</constant>&nbsp;</entry>
	    <entry>enum v4l2_deemphasis</entry>
	  </row>
	  <row id="v4l2-deemphasis"><entry spanname="descr">Configures the de-emphasis value for reception.
A de-emphasis filter is applied to the broadcast to accentuate the high audio frequencies.
Depending on the region, a time constant of either 50 or 75 useconds is used. The enum&nbsp;v4l2_deemphasis
defines possible values for de-emphasis. Here they are:</entry>
	</row><row>
	<entrytbl spanname="descr" cols="2">
		  <tbody valign="top">
		    <row>
		      <entry><constant>V4L2_DEEMPHASIS_DISABLED</constant>&nbsp;</entry>
		      <entry>No de-emphasis is applied.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_DEEMPHASIS_50_uS</constant>&nbsp;</entry>
		      <entry>A de-emphasis of 50 uS is used.</entry>
		    </row>
		    <row>
		      <entry><constant>V4L2_DEEMPHASIS_75_uS</constant>&nbsp;</entry>
		      <entry>A de-emphasis of 75 uS is used.</entry>
		    </row>
		  </tbody>
		</entrytbl>

	  </row>
          <row><entry></entry></row>
        </tbody>
      </tgroup>
      </table>

      </section>
</section>