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Based on kernel version 3.9. Page generated on 2013-05-02 23:04 EST.

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>This ioctl is <emphasis role="bold">deprecated</emphasis>.
53	    New drivers and applications should use &VIDIOC-QUERY-DV-TIMINGS; instead.
54	    </para>
55	
56	    <para>The hardware may be able to detect the current DV preset
57	automatically, similar to sensing the video standard. To do so, applications
58	call <constant> VIDIOC_QUERY_DV_PRESET</constant> with a pointer to a
59	&v4l2-dv-preset; type. Once the hardware detects a preset, that preset is
60	returned in the preset field of &v4l2-dv-preset;. If the preset could not be
61	detected because there was no signal, or the signal was unreliable, or the
62	signal did not map to a supported preset, then the value V4L2_DV_INVALID is
63	returned.</para>
64	  </refsect1>
65	
66	  <refsect1>
67	    &return-value;
68	
69	    <variablelist>
70	      <varlistentry>
71		<term><errorcode>ENODATA</errorcode></term>
72		<listitem>
73		  <para>Digital video presets are not supported for this input or output.</para>
74		</listitem>
75	      </varlistentry>
76	    </variablelist>
77	  </refsect1>
78	</refentry>
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