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[media] v4l: Image processing control class

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Add control class for image processing controls. The control class deals
with controls processing image, for example digital gain or noise filtering,
which can be present in any part of the pipeline.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sakari Ailus
2012-02-02 20:17:54 -03:00
committed by Mauro Carvalho Chehab
parent 8c9d236ec6
commit c643ee1351
4 changed files with 109 additions and 1 deletions
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82
Documentation/DocBook/media/v4l/controls.xml
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@@ -3685,4 +3685,86 @@ interface and may change in the future.</para>
</section>
<section id="image-process-controls">
<title>Image Process Control Reference</title>
<note>
<title>Experimental</title>
<para>This is an <link
linkend="experimental">experimental</link> interface and may
change in the future.</para>
</note>
<para>
The Image Source control class is intended for low-level control of
image processing functions. Unlike
<constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant>, the controls in
this class affect processing the image, and do not control capturing
of it.
</para>
<table pgwide="1" frame="none" id="image-process-control-id">
<title>Image Source Control IDs</title>
<tgroup cols="4">
<colspec colname="c1" colwidth="1*" />
<colspec colname="c2" colwidth="6*" />
<colspec colname="c3" colwidth="2*" />
<colspec colname="c4" colwidth="6*" />
<spanspec namest="c1" nameend="c2" spanname="id" />
<spanspec namest="c2" nameend="c4" spanname="descr" />
<thead>
<row>
<entry spanname="id" align="left">ID</entry>
<entry align="left">Type</entry>
</row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
</row>
</thead>
<tbody valign="top">
<row><entry></entry></row>
<row>
<entry spanname="id"><constant>V4L2_CID_IMAGE_PROC_CLASS</constant></entry>
<entry>class</entry>
</row>
<row>
<entry spanname="descr">The IMAGE_PROC class descriptor.</entry>
</row>
<row>
<entry spanname="id"><constant>V4L2_CID_LINK_FREQ</constant></entry>
<entry>integer menu</entry>
</row>
<row>
<entry spanname="descr">Data bus frequency. Together with the
media bus pixel code, bus type (clock cycles per sample), the
data bus frequency defines the pixel rate
(<constant>V4L2_CID_PIXEL_RATE</constant>) in the
pixel array (or possibly elsewhere, if the device is not an
image sensor). The frame rate can be calculated from the pixel
clock, image width and height and horizontal and vertical
blanking. While the pixel rate control may be defined elsewhere
than in the subdev containing the pixel array, the frame rate
cannot be obtained from that information. This is because only
on the pixel array it can be assumed that the vertical and
horizontal blanking information is exact: no other blanking is
allowed in the pixel array. The selection of frame rate is
performed by selecting the desired horizontal and vertical
blanking. The unit of this control is Hz. </entry>
</row>
<row>
<entry spanname="id"><constant>V4L2_CID_PIXEL_RATE</constant></entry>
<entry>64-bit integer</entry>
</row>
<row>
<entry spanname="descr">Pixel rate in the source pads of
the subdev. This control is read-only and its unit is
pixels / second.
</entry>
</row>
<row><entry></entry></row>
</tbody>
</tgroup>
</table>
</section>
</section>

6
Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml
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@@ -278,6 +278,12 @@ These controls are described in <xref
source controls. These controls are described in <xref
linkend="image-source-controls" />.</entry>
</row>
<row>
<entry><constant>V4L2_CTRL_CLASS_IMAGE_PROC</constant></entry>
<entry>0x9f0000</entry> <entry>The class containing image
processing controls. These controls are described in <xref
linkend="image-process-controls" />.</entry>
</row>
</tbody>
</tgroup>
</table>