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-<refentry id="vidioc-query-dv-preset">
- <refmeta>
- <refentrytitle>ioctl VIDIOC_QUERY_DV_PRESET</refentrytitle>
- &manvol;
- </refmeta>
-
- <refnamediv>
- <refname>VIDIOC_QUERY_DV_PRESET</refname>
- <refpurpose>Sense the DV preset received by the current
-input</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>ioctl</function></funcdef>
- <paramdef>int <parameter>fd</parameter></paramdef>
- <paramdef>int <parameter>request</parameter></paramdef>
- <paramdef>struct v4l2_dv_preset *<parameter>argp</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Arguments</title>
-
- <variablelist>
- <varlistentry>
- <term><parameter>fd</parameter></term>
- <listitem>
- <para>&fd;</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>request</parameter></term>
- <listitem>
- <para>VIDIOC_QUERY_DV_PRESET</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>argp</parameter></term>
- <listitem>
- <para></para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Description</title>
-
- <para>This ioctl is <emphasis role="bold">deprecated</emphasis>.
- New drivers and applications should use &VIDIOC-QUERY-DV-TIMINGS; instead.
- </para>
-
- <para>The hardware may be able to detect the current DV preset
-automatically, similar to sensing the video standard. To do so, applications
-call <constant> VIDIOC_QUERY_DV_PRESET</constant> with a pointer to a
-&v4l2-dv-preset; type. Once the hardware detects a preset, that preset is
-returned in the preset field of &v4l2-dv-preset;. If the preset could not be
-detected because there was no signal, or the signal was unreliable, or the
-signal did not map to a supported preset, then the value V4L2_DV_INVALID is
-returned.</para>
- </refsect1>
-
- <refsect1>
- &return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>ENODATA</errorcode></term>
- <listitem>
- <para>Digital video presets are not supported for this input or output.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-</refentry>