| Mauro Carvalho Chehab | 8e080c2 | 2009-09-13 22:16:04 -0300 | [diff] [blame] | 1 | <refentry id="vidioc-enumaudio"> |
| 2 | <refmeta> |
| 3 | <refentrytitle>ioctl VIDIOC_ENUMAUDIO</refentrytitle> |
| 4 | &manvol; |
| 5 | </refmeta> |
| 6 | |
| 7 | <refnamediv> |
| 8 | <refname>VIDIOC_ENUMAUDIO</refname> |
| 9 | <refpurpose>Enumerate audio inputs</refpurpose> |
| 10 | </refnamediv> |
| 11 | |
| 12 | <refsynopsisdiv> |
| 13 | <funcsynopsis> |
| 14 | <funcprototype> |
| 15 | <funcdef>int <function>ioctl</function></funcdef> |
| 16 | <paramdef>int <parameter>fd</parameter></paramdef> |
| 17 | <paramdef>int <parameter>request</parameter></paramdef> |
| 18 | <paramdef>struct v4l2_audio *<parameter>argp</parameter></paramdef> |
| 19 | </funcprototype> |
| 20 | </funcsynopsis> |
| 21 | </refsynopsisdiv> |
| 22 | |
| 23 | <refsect1> |
| 24 | <title>Arguments</title> |
| 25 | |
| 26 | <variablelist> |
| 27 | <varlistentry> |
| 28 | <term><parameter>fd</parameter></term> |
| 29 | <listitem> |
| 30 | <para>&fd;</para> |
| 31 | </listitem> |
| 32 | </varlistentry> |
| 33 | <varlistentry> |
| 34 | <term><parameter>request</parameter></term> |
| 35 | <listitem> |
| 36 | <para>VIDIOC_ENUMAUDIO</para> |
| 37 | </listitem> |
| 38 | </varlistentry> |
| 39 | <varlistentry> |
| 40 | <term><parameter>argp</parameter></term> |
| 41 | <listitem> |
| 42 | <para></para> |
| 43 | </listitem> |
| 44 | </varlistentry> |
| 45 | </variablelist> |
| 46 | </refsect1> |
| 47 | |
| 48 | <refsect1> |
| 49 | <title>Description</title> |
| 50 | |
| 51 | <para>To query the attributes of an audio input applications |
| 52 | initialize the <structfield>index</structfield> field and zero out the |
| 53 | <structfield>reserved</structfield> array of a &v4l2-audio; |
| 54 | and call the <constant>VIDIOC_ENUMAUDIO</constant> ioctl with a pointer |
| 55 | to this structure. Drivers fill the rest of the structure or return an |
| 56 | &EINVAL; when the index is out of bounds. To enumerate all audio |
| 57 | inputs applications shall begin at index zero, incrementing by one |
| 58 | until the driver returns <errorcode>EINVAL</errorcode>.</para> |
| 59 | |
| 60 | <para>See <xref linkend="vidioc-g-audio" /> for a description of |
| 61 | &v4l2-audio;.</para> |
| 62 | </refsect1> |
| 63 | |
| 64 | <refsect1> |
| 65 | &return-value; |
| 66 | |
| 67 | <variablelist> |
| 68 | <varlistentry> |
| 69 | <term><errorcode>EINVAL</errorcode></term> |
| 70 | <listitem> |
| 71 | <para>The number of the audio input is out of bounds, or |
| 72 | there are no audio inputs at all and this ioctl is not |
| 73 | supported.</para> |
| 74 | </listitem> |
| 75 | </varlistentry> |
| 76 | </variablelist> |
| 77 | </refsect1> |
| 78 | </refentry> |
| 79 | |
| 80 | <!-- |
| 81 | Local Variables: |
| 82 | mode: sgml |
| 83 | sgml-parent-document: "v4l2.sgml" |
| 84 | indent-tabs-mode: nil |
| 85 | End: |
| 86 | --> |