105 lines
3.0 KiB
XML
105 lines
3.0 KiB
XML
<refentry id="vidioc-g-dv-preset">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_G_DV_PRESET</refname>
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<refname>VIDIOC_S_DV_PRESET</refname>
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<refpurpose>Query or select the DV preset of the current input or output</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_G_DV_PRESET, VIDIOC_S_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>To query and select the current DV preset, applications
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use the <constant>VIDIOC_G_DV_PRESET</constant> and <constant>VIDIOC_S_DV_PRESET</constant>
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ioctls which take a pointer to a &v4l2-dv-preset; type as argument.
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Applications must zero the reserved array in &v4l2-dv-preset;.
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<constant>VIDIOC_G_DV_PRESET</constant> returns a dv preset in the field
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<structfield>preset</structfield> of &v4l2-dv-preset;.</para>
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<para><constant>VIDIOC_S_DV_PRESET</constant> accepts a pointer to a &v4l2-dv-preset;
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that has the preset value to be set. Applications must zero the reserved array in &v4l2-dv-preset;.
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If the preset is not supported, it returns an &EINVAL; </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>This ioctl is not supported, or the
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<constant>VIDIOC_S_DV_PRESET</constant>,<constant>VIDIOC_S_DV_PRESET</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>EBUSY</errorcode></term>
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<listitem>
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<para>The device is busy and therefore can not change the preset.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<table pgwide="1" frame="none" id="v4l2-dv-preset">
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<title>struct <structname>v4l2_dv_preset</structname></title>
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<tgroup cols="3">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>__u32</entry>
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<entry><structfield>preset</structfield></entry>
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<entry>Preset value to represent the digital video timings</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>reserved[4]</structfield></entry>
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<entry>Reserved fields for future use</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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<refsect1>
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&return-value;
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</refsect1>
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</refentry>
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