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