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Sakari Ailus
ef56c563c4
Add a reference to the LINK_FREQ control and clarify the meaning of the control as for C-PHY the matter is less obvious. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Mirela Rabulea <mirela.rabulea@nxp.com> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
62 lines
2.3 KiB
ReStructuredText
62 lines
2.3 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: V4L
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.. _image-process-controls:
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*******************************
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Image Process Control Reference
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*******************************
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The Image Process control class is intended for low-level control of
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image processing functions. Unlike ``V4L2_CID_IMAGE_SOURCE_CLASS``, the
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controls in this class affect processing the image, and do not control
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capturing of it.
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.. _image-process-control-id:
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Image Process Control IDs
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=========================
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``V4L2_CID_IMAGE_PROC_CLASS (class)``
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The IMAGE_PROC class descriptor.
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.. _v4l2-cid-link-freq:
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``V4L2_CID_LINK_FREQ (integer menu)``
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The fundamental frequency of the operating symbol rate (serial interfaces
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such as CSI-2) or the sampling rate (parallel interfaces such as DVP or
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Bt.565) of the data interface. For CSI-2, the frequency is equal to
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_1 / (2 * UI)_.
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.. _v4l2-cid-pixel-rate:
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``V4L2_CID_PIXEL_RATE (64-bit integer)``
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Pixel sampling rate in the device's pixel array. This control is
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read-only and its unit is pixels / second.
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Some devices use horizontal and vertical blanking to configure the frame
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rate. The frame rate can be calculated from the pixel rate, analogue crop
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rectangle as well as horizontal and vertical blanking. The pixel rate
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control may be present in a different sub-device than the blanking controls
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and the analogue crop rectangle configuration.
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The configuration of the frame rate is performed by selecting the desired
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horizontal and vertical blanking. The unit of this control is Hz.
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``V4L2_CID_TEST_PATTERN (menu)``
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Some capture/display/sensor devices have the capability to generate
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test pattern images. These hardware specific test patterns can be
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used to test if a device is working properly.
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``V4L2_CID_DEINTERLACING_MODE (menu)``
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The video deinterlacing mode (such as Bob, Weave, ...). The menu items are
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driver specific and are documented in :ref:`uapi-v4l-drivers`.
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``V4L2_CID_DIGITAL_GAIN (integer)``
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Digital gain is the value by which all colour components
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are multiplied by. Typically the digital gain applied is the
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control value divided by e.g. 0x100, meaning that to get no
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digital gain the control value needs to be 0x100. The no-gain
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configuration is also typically the default.
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