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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-query-dv-preset.xml')
-rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-query-dv-preset.xml | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-query-dv-preset.xml b/Documentation/DocBook/media/v4l/vidioc-query-dv-preset.xml new file mode 100644 index 000000000000..d272f7ab91b8 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-query-dv-preset.xml | |||
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1 | <refentry id="vidioc-query-dv-preset"> | ||
2 | <refmeta> | ||
3 | <refentrytitle>ioctl VIDIOC_QUERY_DV_PRESET</refentrytitle> | ||
4 | &manvol; | ||
5 | </refmeta> | ||
6 | |||
7 | <refnamediv> | ||
8 | <refname>VIDIOC_QUERY_DV_PRESET</refname> | ||
9 | <refpurpose>Sense the DV preset received by the current | ||
10 | input</refpurpose> | ||
11 | </refnamediv> | ||
12 | |||
13 | <refsynopsisdiv> | ||
14 | <funcsynopsis> | ||
15 | <funcprototype> | ||
16 | <funcdef>int <function>ioctl</function></funcdef> | ||
17 | <paramdef>int <parameter>fd</parameter></paramdef> | ||
18 | <paramdef>int <parameter>request</parameter></paramdef> | ||
19 | <paramdef>struct v4l2_dv_preset *<parameter>argp</parameter></paramdef> | ||
20 | </funcprototype> | ||
21 | </funcsynopsis> | ||
22 | </refsynopsisdiv> | ||
23 | |||
24 | <refsect1> | ||
25 | <title>Arguments</title> | ||
26 | |||
27 | <variablelist> | ||
28 | <varlistentry> | ||
29 | <term><parameter>fd</parameter></term> | ||
30 | <listitem> | ||
31 | <para>&fd;</para> | ||
32 | </listitem> | ||
33 | </varlistentry> | ||
34 | <varlistentry> | ||
35 | <term><parameter>request</parameter></term> | ||
36 | <listitem> | ||
37 | <para>VIDIOC_QUERY_DV_PRESET</para> | ||
38 | </listitem> | ||
39 | </varlistentry> | ||
40 | <varlistentry> | ||
41 | <term><parameter>argp</parameter></term> | ||
42 | <listitem> | ||
43 | <para></para> | ||
44 | </listitem> | ||
45 | </varlistentry> | ||
46 | </variablelist> | ||
47 | </refsect1> | ||
48 | |||
49 | <refsect1> | ||
50 | <title>Description</title> | ||
51 | |||
52 | <para>The hardware may be able to detect the current DV preset | ||
53 | automatically, similar to sensing the video standard. To do so, applications | ||
54 | call <constant> VIDIOC_QUERY_DV_PRESET</constant> with a pointer to a | ||
55 | &v4l2-dv-preset; type. Once the hardware detects a preset, that preset is | ||
56 | returned in the preset field of &v4l2-dv-preset;. If the preset could not be | ||
57 | detected because there was no signal, or the signal was unreliable, or the | ||
58 | signal did not map to a supported preset, then the value V4L2_DV_INVALID is | ||
59 | returned.</para> | ||
60 | </refsect1> | ||
61 | |||
62 | <refsect1> | ||
63 | &return-value; | ||
64 | <variablelist> | ||
65 | <varlistentry> | ||
66 | <term><errorcode>EINVAL</errorcode></term> | ||
67 | <listitem> | ||
68 | <para>This ioctl is not supported.</para> | ||
69 | </listitem> | ||
70 | </varlistentry> | ||
71 | <varlistentry> | ||
72 | <term><errorcode>EBUSY</errorcode></term> | ||
73 | <listitem> | ||
74 | <para>The device is busy and therefore can not sense the preset</para> | ||
75 | </listitem> | ||
76 | </varlistentry> | ||
77 | </variablelist> | ||
78 | </refsect1> | ||
79 | </refentry> | ||
80 | |||
81 | <!-- | ||
82 | Local Variables: | ||
83 | mode: sgml | ||
84 | sgml-parent-document: "v4l2.sgml" | ||
85 | indent-tabs-mode: nil | ||
86 | End: | ||
87 | --> | ||