1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2 .. c:namespace:: V4L
3
4 .. _VIDIOC_G_INPUT:
5
6 ************************************
7 ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT
8 ************************************
9
10 Name
11 ====
12
13 VIDIOC_G_INPUT - VIDIOC_S_INPUT - Query or sel
14
15 Synopsis
16 ========
17
18 .. c:macro:: VIDIOC_G_INPUT
19
20 ``int ioctl(int fd, VIDIOC_G_INPUT, int *argp)
21
22 .. c:macro:: VIDIOC_S_INPUT
23
24 ``int ioctl(int fd, VIDIOC_S_INPUT, int *argp)
25
26 Arguments
27 =========
28
29 ``fd``
30 File descriptor returned by :c:func:`open(
31
32 ``argp``
33 Pointer an integer with input index.
34
35 Description
36 ===========
37
38 To query the current video input applications
39 :ref:`VIDIOC_G_INPUT <VIDIOC_G_INPUT>` ioctl w
40 stores the number of the input, as in the stru
41 :c:type:`v4l2_input` ``index`` field. This ioc
42 only when there are no video inputs, returning
43
44 To select a video input applications store the
45 input in an integer and call the :ref:`VIDIOC_
46 to this integer. Side effects are possible. Fo
47 support different video standards, so the driv
48 the current standard. Because of these possibl
49 applications must select an input before query
50 other parameters.
51
52 Information about video inputs is available us
53 :ref:`VIDIOC_ENUMINPUT` ioctl.
54
55 Return Value
56 ============
57
58 On success 0 is returned, on error -1 and the
59 appropriately. The generic error codes are des
60 :ref:`Generic Error Codes <gen-errors>` chapte
61
62 EINVAL
63 The number of the video input is out of bo
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