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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml deleted file mode 100644 index 4cddd78..0000000 --- a/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml +++ /dev/null @@ -1,158 +0,0 @@ -<refentry id="vidioc-subdev-g-crop"> - <refmeta> - <refentrytitle>ioctl VIDIOC_SUBDEV_G_CROP, VIDIOC_SUBDEV_S_CROP</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>VIDIOC_SUBDEV_G_CROP</refname> - <refname>VIDIOC_SUBDEV_S_CROP</refname> - <refpurpose>Get or set the crop rectangle on a subdev pad</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_crop *<parameter>argp</parameter></paramdef> - </funcprototype> - </funcsynopsis> - <funcsynopsis> - <funcprototype> - <funcdef>int <function>ioctl</function></funcdef> - <paramdef>int <parameter>fd</parameter></paramdef> - <paramdef>int <parameter>request</parameter></paramdef> - <paramdef>const struct v4l2_subdev_crop *<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_G_CROP, VIDIOC_SUBDEV_S_CROP</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>argp</parameter></term> - <listitem> - <para></para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>Description</title> - - <note> - <title>Obsolete</title> - - <para>This is an <link linkend="obsolete">obsolete</link> - interface and may be removed in the future. It is superseded by - <link linkend="vidioc-subdev-g-selection">the selection - API</link>.</para> - </note> - - <para>To retrieve the current crop rectangle applications set the - <structfield>pad</structfield> field of a &v4l2-subdev-crop; to the - desired pad number as reported by the media API and the - <structfield>which</structfield> field to - <constant>V4L2_SUBDEV_FORMAT_ACTIVE</constant>. They then call the - <constant>VIDIOC_SUBDEV_G_CROP</constant> ioctl with a pointer to this - structure. The driver fills the members of the <structfield>rect</structfield> - field or returns &EINVAL; if the input arguments are invalid, or if cropping - is not supported on the given pad.</para> - - <para>To change the current crop rectangle applications set both the - <structfield>pad</structfield> and <structfield>which</structfield> fields - and all members of the <structfield>rect</structfield> field. They then call - the <constant>VIDIOC_SUBDEV_S_CROP</constant> ioctl with a pointer to this - structure. The driver verifies the requested crop rectangle, adjusts it - based on the hardware capabilities and configures the device. Upon return - the &v4l2-subdev-crop; contains the current format as would be returned - by a <constant>VIDIOC_SUBDEV_G_CROP</constant> call.</para> - - <para>Applications can query the device capabilities by setting the - <structfield>which</structfield> to - <constant>V4L2_SUBDEV_FORMAT_TRY</constant>. When set, 'try' crop - rectangles are not applied to the device by the driver, but are mangled - exactly as active crop rectangles and stored in the sub-device file handle. - Two applications querying the same sub-device would thus not interact with - each other.</para> - - <para>Drivers must not return an error solely because the requested crop - rectangle doesn't match the device capabilities. They must instead modify - the rectangle to match what the hardware can provide. The modified format - should be as close as possible to the original request.</para> - - <table pgwide="1" frame="none" id="v4l2-subdev-crop"> - <title>struct <structname>v4l2_subdev_crop</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>pad</structfield></entry> - <entry>Pad number as reported by the media framework.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>which</structfield></entry> - <entry>Crop rectangle to get or set, from - &v4l2-subdev-format-whence;.</entry> - </row> - <row> - <entry>&v4l2-rect;</entry> - <entry><structfield>rect</structfield></entry> - <entry>Crop rectangle boundaries, in pixels.</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>EBUSY</errorcode></term> - <listitem> - <para>The crop rectangle can't be changed because the pad is currently - busy. This can be caused, for instance, by an active video stream on - the pad. The ioctl must not be retried without performing another - action to fix the problem first. Only returned by - <constant>VIDIOC_SUBDEV_S_CROP</constant></para> - </listitem> - </varlistentry> - <varlistentry> - <term><errorcode>EINVAL</errorcode></term> - <listitem> - <para>The &v4l2-subdev-crop; <structfield>pad</structfield> - references a non-existing pad, the <structfield>which</structfield> - field references a non-existing format, or cropping is not supported - on the given subdev pad.</para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> -</refentry> |
