1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2 .. c:namespace:: V4L
3
4 .. _VIDIOC_ENUMAUDOUT:
5
6 ***********************
7 ioctl VIDIOC_ENUMAUDOUT
8 ***********************
9
10 Name
11 ====
12
13 VIDIOC_ENUMAUDOUT - Enumerate audio outputs
14
15 Synopsis
16 ========
17
18 .. c:macro:: VIDIOC_ENUMAUDOUT
19
20 ``int ioctl(int fd, VIDIOC_ENUMAUDOUT, struct
21
22 Arguments
23 =========
24
25 ``fd``
26 File descriptor returned by :c:func:`open(
27
28 ``argp``
29 Pointer to struct :c:type:`v4l2_audioout`.
30
31 Description
32 ===========
33
34 To query the attributes of an audio output app
35 ``index`` field and zero out the ``reserved``
36 :c:type:`v4l2_audioout` and call the ``VIDIOC_
37 ioctl with a pointer to this structure. Driver
38 structure or return an ``EINVAL`` error code w
39 bounds. To enumerate all audio outputs applica
40 zero, incrementing by one until the driver ret
41
42 .. note::
43
44 Connectors on a TV card to loop back the r
45 to a sound card are not audio outputs in t
46
47 See :ref:`VIDIOC_G_AUDIOout <VIDIOC_G_AUDOUT>`
48 :c:type:`v4l2_audioout`.
49
50 Return Value
51 ============
52
53 On success 0 is returned, on error -1 and the
54 appropriately. The generic error codes are des
55 :ref:`Generic Error Codes <gen-errors>` chapte
56
57 EINVAL
58 The number of the audio output is out of b
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