mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 15:55:40 +07:00
64 lines
2.7 KiB
ReStructuredText
64 lines
2.7 KiB
ReStructuredText
|
.. Permission is granted to copy, distribute and/or modify this
|
||
|
|
.. document under the terms of the GNU Free Documentation License,
|
||
|
|
.. Version 1.1 or any later version published by the Free Software
|
||
|
|
.. Foundation, with no Invariant Sections, no Front-Cover Texts
|
||
|
|
.. and no Back-Cover Texts. A copy of the license is included at
|
||
|
|
.. Documentation/media/uapi/fdl-appendix.rst.
|
||
|
|
..
|
||
|
|
.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
|
||
|
|
|
||
|
|
.. _image-process-controls:
|
||
|
|
|
||
|
|
*******************************
|
||
|
|
Image Process Control Reference
|
||
|
|
*******************************
|
||
|
|
|
||
|
|
The Image Process control class is intended for low-level control of
|
||
|
|
image processing functions. Unlike ``V4L2_CID_IMAGE_SOURCE_CLASS``, the
|
||
|
|
controls in this class affect processing the image, and do not control
|
||
|
|
capturing of it.
|
||
|
|
|
||
|
|
|
||
|
|
.. _image-process-control-id:
|
||
|
|
|
||
|
|
Image Process Control IDs
|
||
|
|
=========================
|
||
|
|
|
||
|
|
``V4L2_CID_IMAGE_PROC_CLASS (class)``
|
||
|
|
The IMAGE_PROC class descriptor.
|
||
|
|
|
||
|
|
``V4L2_CID_LINK_FREQ (integer menu)``
|
||
|
|
Data bus frequency. Together with the media bus pixel code, bus type
|
||
|
|
(clock cycles per sample), the data bus frequency defines the pixel
|
||
|
|
rate (``V4L2_CID_PIXEL_RATE``) 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.
|
||
|
|
|
||
|
|
``V4L2_CID_PIXEL_RATE (64-bit integer)``
|
||
|
|
Pixel rate in the source pads of the subdev. This control is
|
||
|
|
read-only and its unit is pixels / second.
|
||
|
|
|
||
|
|
``V4L2_CID_TEST_PATTERN (menu)``
|
||
|
|
Some capture/display/sensor devices have the capability to generate
|
||
|
|
test pattern images. These hardware specific test patterns can be
|
||
|
|
used to test if a device is working properly.
|
||
|
|
|
||
|
|
``V4L2_CID_DEINTERLACING_MODE (menu)``
|
||
|
|
The video deinterlacing mode (such as Bob, Weave, ...). The menu items are
|
||
|
|
driver specific and are documented in :ref:`v4l-drivers`.
|
||
|
|
|
||
|
|
``V4L2_CID_DIGITAL_GAIN (integer)``
|
||
|
|
Digital gain is the value by which all colour components
|
||
|
|
are multiplied by. Typically the digital gain applied is the
|
||
|
|
control value divided by e.g. 0x100, meaning that to get no
|
||
|
|
digital gain the control value needs to be 0x100. The no-gain
|
||
|
|
configuration is also typically the default.
|