mirror of https://gitee.com/openkylin/linux.git
212 lines
6.0 KiB
XML
212 lines
6.0 KiB
XML
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<refentry id="vidioc-dv-timings-cap">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_DV_TIMINGS_CAP</refname>
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<refpurpose>The capabilities of the Digital Video receiver/transmitter</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_timings_cap *<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_DV_TIMINGS_CAP</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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<note>
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<title>Experimental</title>
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<para>This is an <link linkend="experimental"> experimental </link>
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interface and may change in the future.</para>
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</note>
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<para>To query the available timings, applications initialize the
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<structfield>index</structfield> field and zero the reserved array of &v4l2-dv-timings-cap;
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and call the <constant>VIDIOC_DV_TIMINGS_CAP</constant> ioctl with a pointer to this
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structure. Drivers fill the rest of the structure or return an
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&EINVAL; when the index is out of bounds. To enumerate all supported DV timings,
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applications shall begin at index zero, incrementing by one until the
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driver returns <errorcode>EINVAL</errorcode>. Note that drivers may enumerate a
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different set of DV timings after switching the video input or
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output.</para>
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<table pgwide="1" frame="none" id="v4l2-bt-timings-cap">
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<title>struct <structname>v4l2_bt_timings_cap</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>min_width</structfield></entry>
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<entry>Minimum width of the active video in pixels.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>max_width</structfield></entry>
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<entry>Maximum width of the active video in pixels.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>min_height</structfield></entry>
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<entry>Minimum height of the active video in lines.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>max_height</structfield></entry>
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<entry>Maximum height of the active video in lines.</entry>
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</row>
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<row>
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<entry>__u64</entry>
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<entry><structfield>min_pixelclock</structfield></entry>
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<entry>Minimum pixelclock frequency in Hz.</entry>
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</row>
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<row>
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<entry>__u64</entry>
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<entry><structfield>max_pixelclock</structfield></entry>
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<entry>Maximum pixelclock frequency in Hz.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>standards</structfield></entry>
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<entry>The video standard(s) supported by the hardware.
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See <xref linkend="dv-bt-standards"/> for a list of standards.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>capabilities</structfield></entry>
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<entry>Several flags giving more information about the capabilities.
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See <xref linkend="dv-bt-cap-capabilities"/> for a description of the flags.
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</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</structfield>[16]</entry>
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<entry></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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<table pgwide="1" frame="none" id="v4l2-dv-timings-cap">
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<title>struct <structname>v4l2_dv_timings_cap</structname></title>
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<tgroup cols="4">
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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>type</structfield></entry>
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<entry>Type of DV timings as listed in <xref linkend="dv-timing-types"/>.</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</structfield>[3]</entry>
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<entry>Reserved for future extensions. Drivers must set the array to zero.</entry>
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</row>
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<row>
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<entry>union</entry>
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<entry><structfield></structfield></entry>
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<entry></entry>
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</row>
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<row>
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<entry></entry>
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<entry>&v4l2-bt-timings-cap;</entry>
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<entry><structfield>bt</structfield></entry>
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<entry>BT.656/1120 timings capabilities of the hardware.</entry>
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</row>
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<row>
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<entry></entry>
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<entry>__u32</entry>
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<entry><structfield>raw_data</structfield>[32]</entry>
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<entry></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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<table pgwide="1" frame="none" id="dv-bt-cap-capabilities">
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<title>DV BT Timing capabilities</title>
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<tgroup cols="2">
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&cs-str;
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<tbody valign="top">
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<row>
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<entry>Flag</entry>
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<entry>Description</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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</row>
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<row>
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<entry>V4L2_DV_BT_CAP_INTERLACED</entry>
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<entry>Interlaced formats are supported.
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</entry>
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</row>
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<row>
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<entry>V4L2_DV_BT_CAP_PROGRESSIVE</entry>
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<entry>Progressive formats are supported.
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</entry>
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</row>
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<row>
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<entry>V4L2_DV_BT_CAP_REDUCED_BLANKING</entry>
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<entry>CVT/GTF specific: the timings can make use of reduced blanking (CVT)
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or the 'Secondary GTF' curve (GTF).
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</entry>
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</row>
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<row>
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<entry>V4L2_DV_BT_CAP_CUSTOM</entry>
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<entry>Can support non-standard timings, i.e. timings not belonging to the
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standards set in the <structfield>standards</structfield> field.
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</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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<!--
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Local Variables:
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mode: sgml
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sgml-parent-document: "v4l2.sgml"
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indent-tabs-mode: nil
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End:
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-->
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