linux/Documentation/DocBook/media/v4l/vidioc-g-std.xml
Hans Verkuil 663dc7f3a0 [media] DocBook: document when to return ENODATA
ENODATA should be returned if the API used for getting, changing, querying
or enumerating the current video timings is not supported by the current input
or output.
This was decided during the 2012 Media Workshop.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-09-26 09:46:39 -03:00

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<refentry id="vidioc-g-std">
<refmeta>
<refentrytitle>ioctl VIDIOC_G_STD, VIDIOC_S_STD</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname>VIDIOC_G_STD</refname>
<refname>VIDIOC_S_STD</refname>
<refpurpose>Query or select the video standard of 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>v4l2_std_id
*<parameter>argp</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<funcsynopsis>
<funcprototype>
<funcdef>int <function>ioctl</function></funcdef>
<paramdef>int <parameter>fd</parameter></paramdef>
<paramdef>int <parameter>request</parameter></paramdef>
<paramdef>const v4l2_std_id
*<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_G_STD, VIDIOC_S_STD</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>argp</parameter></term>
<listitem>
<para></para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Description</title>
<para>To query and select the current video standard applications
use the <constant>VIDIOC_G_STD</constant> and <constant>VIDIOC_S_STD</constant> ioctls which take a pointer to a
&v4l2-std-id; type as argument. <constant>VIDIOC_G_STD</constant> can
return a single flag or a set of flags as in &v4l2-standard; field
<structfield>id</structfield>. The flags must be unambiguous such
that they appear in only one enumerated <structname>v4l2_standard</structname> structure.</para>
<para><constant>VIDIOC_S_STD</constant> accepts one or more
flags, being a write-only ioctl it does not return the actual new standard as
<constant>VIDIOC_G_STD</constant> does. When no flags are given or
the current input does not support the requested standard the driver
returns an &EINVAL;. When the standard set is ambiguous drivers may
return <errorcode>EINVAL</errorcode> or choose any of the requested
standards. If the current input or output does not support standard video timings (e.g. if
&VIDIOC-ENUMINPUT; does not set the <constant>V4L2_IN_CAP_STD</constant> flag), then
&ENODATA; is returned.</para>
</refsect1>
<refsect1>
&return-value;
<variablelist>
<varlistentry>
<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The <constant>VIDIOC_S_STD</constant> parameter was unsuitable.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><errorcode>ENODATA</errorcode></term>
<listitem>
<para>Standard video timings are not supported for this input or output.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>