summaryrefslogtreecommitdiffstats
path: root/Documentation/DocBook/media/v4l/controls.xml
blob: 85164016ed26c28e736651cd4c7199224ed503a6 (plain)
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
  <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>
	  <entry><constant>V4L2_CID_HCENTER_DEPRECATED</constant> (formerly <constant>V4L2_CID_HCENTER</constant>)</entry>
	    <entry>integer</entry>
	    <entry>Horizontal image centering. This control is
deprecated. New drivers and applications should use the <link
linkend="camera-controls">Camera class controls</link>
<constant>V4L2_CID_PAN_ABSOLUTE</constant>,
<constant>V4L2_CID_PAN_RELATIVE</constant> and
<constant>V4L2_CID_PAN_RESET</constant> instead.</entry>
	  </row>
	  <row>
	    <entry><constant>V4L2_CID_VCENTER_DEPRECATED</constant>
	    (formerly <constant>V4L2_CID_VCENTER</constant>)</entry>
	    <entry>integer</entry>
	    <entry>Vertical image centering. Centering is intended to
<emphasis>physically</emphasis> adjust cameras. For image cropping see
<xref linkend="crop" />, for clipping <xref linkend="overlay" />. This
control is deprecated. New drivers and applications should use the
<link linkend="camera-controls">Camera class controls</link>
<constant>V4L2_CID_TILT_ABSOLUTE</constant>,
<constant>V4L2_CID_TILT_RELATIVE</constant> and
<constant>V4L2_CID_TILT_RESET</constant> instead.</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) and
<constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2).</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. Possible values for
<constant>enum v4l2_colorfx</constant> are:
<constant>V4L2_COLORFX_NONE</constant> (0),
<constant>V4L2_COLORFX_BW</constant> (1),
<constant>V4L2_COLORFX_SEPIA</constant> (2),
<constant>V4L2_COLORFX_NEGATIVE</constant> (3),
<constant>V4L2_COLORFX_EMBOSS</constant> (4),
<constant>V4L2_COLORFX_SKETCH</constant> (5),
<constant>V4L2_COLORFX_SKY_BLUE</constant> (6),
<constant>V4L2_COLORFX_GRASS_GREEN</constant> (7),
<constant>V4L2_COLORFX_SKIN_WHITEN</constant> (8) and
<constant>V4L2_COLORFX_VIVID</constant> (9).</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_LASTP1</constant></entry>
	    <entry></entry>
	    <entry>End of the predefined control IDs (currently
<constant>V4L2_CID_ILLUMINATORS_2</constant> + 1).</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>
	    <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-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>
		<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>
		<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>
		<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>
		<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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_PROFILE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_h264_symbol_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 succesive 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 succesfully 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>
		<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 succesfully 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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_HEADER_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_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_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>

	    </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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FRAME_SKIP_MODE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_mfc51_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>
		<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE</constant>&nbsp;</entry>
		<entry>enum&nbsp;v4l2_mpeg_mfc51_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_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 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_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>
	</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="en50067" />, 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="en50067" />. 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>integer</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="en50067" /> 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>

	</section>

      </section>

      <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>
	      </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>

  <!--
Local Variables:
mode: sgml
sgml-parent-document: "common.sgml"
indent-tabs-mode: nil
End:
  -->