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-<refentry id="vidioc-enumaudio">
- <refmeta>
- <refentrytitle>ioctl VIDIOC_ENUMAUDIO</refentrytitle>
- &manvol;
- </refmeta>
-
- <refnamediv>
- <refname>VIDIOC_ENUMAUDIO</refname>
- <refpurpose>Enumerate audio inputs</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_audio *<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_ENUMAUDIO</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>argp</parameter></term>
- <listitem>
- <para></para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Description</title>
-
- <para>To query the attributes of an audio input applications
-initialize the <structfield>index</structfield> field and zero out the
-<structfield>reserved</structfield> array of a &v4l2-audio;
-and call the <constant>VIDIOC_ENUMAUDIO</constant> ioctl with a pointer
-to this structure. Drivers fill the rest of the structure or return an
-&EINVAL; when the index is out of bounds. To enumerate all audio
-inputs applications shall begin at index zero, incrementing by one
-until the driver returns <errorcode>EINVAL</errorcode>.</para>
-
- <para>See <xref linkend="vidioc-g-audio" /> for a description of
-&v4l2-audio;.</para>
- </refsect1>
-
- <refsect1>
- &return-value;
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The number of the audio input is out of bounds, or
-there are no audio inputs at all and this ioctl is not
-supported.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-</refentry>
-
-<!--
-Local Variables:
-mode: sgml
-sgml-parent-document: "v4l2.sgml"
-indent-tabs-mode: nil
-End:
--->