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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>
79 lines
2.2 KiB
XML
79 lines
2.2 KiB
XML
<refentry id="vidioc-query-dv-preset">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_QUERY_DV_PRESET</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_QUERY_DV_PRESET</refname>
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<refpurpose>Sense the DV preset received by the current
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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>struct v4l2_dv_preset *<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_QUERY_DV_PRESET</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>This ioctl is <emphasis role="bold">deprecated</emphasis>.
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New drivers and applications should use &VIDIOC-QUERY-DV-TIMINGS; instead.
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</para>
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<para>The hardware may be able to detect the current DV preset
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automatically, similar to sensing the video standard. To do so, applications
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call <constant> VIDIOC_QUERY_DV_PRESET</constant> with a pointer to a
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&v4l2-dv-preset; type. Once the hardware detects a preset, that preset is
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returned in the preset field of &v4l2-dv-preset;. If the preset could not be
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detected because there was no signal, or the signal was unreliable, or the
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signal did not map to a supported preset, then the value V4L2_DV_INVALID is
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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>ENODATA</errorcode></term>
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<listitem>
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<para>Digital video presets 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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