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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-interval.xml')
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1 files changed, 0 insertions, 157 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-interval.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-interval.xml deleted file mode 100644 index cff59f5cbf04..000000000000 --- a/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-interval.xml +++ /dev/null @@ -1,157 +0,0 @@ -<refentry id="vidioc-subdev-enum-frame-interval"> - <refmeta> - <refentrytitle>ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</refname> - <refpurpose>Enumerate frame intervals</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <funcsynopsis> - <funcprototype> - <funcdef>int <function>ioctl</function></funcdef> - <paramdef>int <parameter>fd</parameter></paramdef> - <paramdef>int <parameter>request</parameter></paramdef> - <paramdef>struct v4l2_subdev_frame_interval_enum * - <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_SUBDEV_ENUM_FRAME_INTERVAL</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>argp</parameter></term> - <listitem> - <para></para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>Description</title> - - <note> - <title>Experimental</title> - <para>This is an <link linkend="experimental">experimental</link> - interface and may change in the future.</para> - </note> - - <para>This ioctl lets applications enumerate available frame intervals on a - given sub-device pad. Frame intervals only makes sense for sub-devices that - can control the frame period on their own. This includes, for instance, - image sensors and TV tuners.</para> - - <para>For the common use case of image sensors, the frame intervals - available on the sub-device output pad depend on the frame format and size - on the same pad. Applications must thus specify the desired format and size - when enumerating frame intervals.</para> - - <para>To enumerate frame intervals applications initialize the - <structfield>index</structfield>, <structfield>pad</structfield>, - <structfield>which</structfield>, <structfield>code</structfield>, - <structfield>width</structfield> and <structfield>height</structfield> - fields of &v4l2-subdev-frame-interval-enum; and call the - <constant>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</constant> ioctl with a pointer - to this structure. Drivers fill the rest of the structure or return - an &EINVAL; if one of the input fields is invalid. All frame intervals are - enumerable by beginning at index zero and incrementing by one until - <errorcode>EINVAL</errorcode> is returned.</para> - - <para>Available frame intervals may depend on the current 'try' formats - at other pads of the sub-device, as well as on the current active links. See - &VIDIOC-SUBDEV-G-FMT; for more information about the try formats.</para> - - <para>Sub-devices that support the frame interval enumeration ioctl should - implemented it on a single pad only. Its behaviour when supported on - multiple pads of the same sub-device is not defined.</para> - - <table pgwide="1" frame="none" id="v4l2-subdev-frame-interval-enum"> - <title>struct <structname>v4l2_subdev_frame_interval_enum</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>index</structfield></entry> - <entry>Number of the format in the enumeration, set by the - application.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>pad</structfield></entry> - <entry>Pad number as reported by the media controller API.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>code</structfield></entry> - <entry>The media bus format code, as defined in - <xref linkend="v4l2-mbus-format" />.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>width</structfield></entry> - <entry>Frame width, in pixels.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>height</structfield></entry> - <entry>Frame height, in pixels.</entry> - </row> - <row> - <entry>&v4l2-fract;</entry> - <entry><structfield>interval</structfield></entry> - <entry>Period, in seconds, between consecutive video frames.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>which</structfield></entry> - <entry>Frame intervals to be enumerated, from &v4l2-subdev-format-whence;.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>reserved</structfield>[8]</entry> - <entry>Reserved for future extensions. Applications and drivers must - set the array to zero.</entry> - </row> - </tbody> - </tgroup> - </table> - </refsect1> - - <refsect1> - &return-value; - - <variablelist> - <varlistentry> - <term><errorcode>EINVAL</errorcode></term> - <listitem> - <para>The &v4l2-subdev-frame-interval-enum; - <structfield>pad</structfield> references a non-existing pad, one of - the <structfield>code</structfield>, <structfield>width</structfield> - or <structfield>height</structfield> fields are invalid for the given - pad or the <structfield>index</structfield> field is out of bounds. - </para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> -</refentry> |