8e080c2e6c
The V4L and DVB API's are there for a long time. however, up to now, no efforts were done to merge them to kernel DocBook. This patch adds the current versions of the specs as an unique compendium. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
173 lines
5.2 KiB
XML
173 lines
5.2 KiB
XML
<refentry id="vidioc-enumoutput">
|
|
<refmeta>
|
|
<refentrytitle>ioctl VIDIOC_ENUMOUTPUT</refentrytitle>
|
|
&manvol;
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>VIDIOC_ENUMOUTPUT</refname>
|
|
<refpurpose>Enumerate video outputs</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_output *<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_ENUMOUTPUT</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 a video outputs applications
|
|
initialize the <structfield>index</structfield> field of &v4l2-output;
|
|
and call the <constant>VIDIOC_ENUMOUTPUT</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
|
|
outputs applications shall begin at index zero, incrementing by one
|
|
until the driver returns <errorcode>EINVAL</errorcode>.</para>
|
|
|
|
<table frame="none" pgwide="1" id="v4l2-output">
|
|
<title>struct <structname>v4l2_output</structname></title>
|
|
<tgroup cols="3">
|
|
&cs-str;
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>index</structfield></entry>
|
|
<entry>Identifies the output, set by the
|
|
application.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u8</entry>
|
|
<entry><structfield>name</structfield>[32]</entry>
|
|
<entry>Name of the video output, a NUL-terminated ASCII
|
|
string, for example: "Vout". This information is intended for the
|
|
user, preferably the connector label on the device itself.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>type</structfield></entry>
|
|
<entry>Type of the output, see <xref
|
|
linkend="output-type" />.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>audioset</structfield></entry>
|
|
<entry><para>Drivers can enumerate up to 32 video and
|
|
audio outputs. This field shows which audio outputs were
|
|
selectable as the current output if this was the currently selected
|
|
video output. It is a bit mask. The LSB corresponds to audio output 0,
|
|
the MSB to output 31. Any number of bits can be set, or
|
|
none.</para><para>When the driver does not enumerate audio outputs no
|
|
bits must be set. Applications shall not interpret this as lack of
|
|
audio support. Drivers may automatically select audio outputs without
|
|
enumerating them.</para><para>For details on audio outputs and how to
|
|
select the current output see <xref linkend="audio" />.</para></entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>modulator</structfield></entry>
|
|
<entry>Output devices can have zero or more RF modulators.
|
|
When the <structfield>type</structfield> is
|
|
<constant>V4L2_OUTPUT_TYPE_MODULATOR</constant> this is an RF
|
|
connector and this field identifies the modulator. It corresponds to
|
|
&v4l2-modulator; field <structfield>index</structfield>. For details
|
|
on modulators see <xref linkend="tuner" />.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>&v4l2-std-id;</entry>
|
|
<entry><structfield>std</structfield></entry>
|
|
<entry>Every video output supports one or more different
|
|
video standards. This field is a set of all supported standards. For
|
|
details on video standards and how to switch see <xref
|
|
linkend="standard" />.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>reserved</structfield>[4]</entry>
|
|
<entry>Reserved for future extensions. Drivers must set
|
|
the array to zero.</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table frame="none" pgwide="1" id="output-type">
|
|
<title>Output Type</title>
|
|
<tgroup cols="3">
|
|
&cs-def;
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry><constant>V4L2_OUTPUT_TYPE_MODULATOR</constant></entry>
|
|
<entry>1</entry>
|
|
<entry>This output is an analog TV modulator.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><constant>V4L2_OUTPUT_TYPE_ANALOG</constant></entry>
|
|
<entry>2</entry>
|
|
<entry>Analog baseband output, for example Composite /
|
|
CVBS, S-Video, RGB.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><constant>V4L2_OUTPUT_TYPE_ANALOGVGAOVERLAY</constant></entry>
|
|
<entry>3</entry>
|
|
<entry>[?]</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
</refsect1>
|
|
<refsect1>
|
|
&return-value;
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><errorcode>EINVAL</errorcode></term>
|
|
<listitem>
|
|
<para>The &v4l2-output; <structfield>index</structfield>
|
|
is out of bounds.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
</refentry>
|
|
|
|
<!--
|
|
Local Variables:
|
|
mode: sgml
|
|
sgml-parent-document: "v4l2.sgml"
|
|
indent-tabs-mode: nil
|
|
End:
|
|
-->
|