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Diffstat (limited to 'Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst | 38 |
1 files changed, 16 insertions, 22 deletions
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst index bb9d484c25e4..27803dca8d3e 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-image-process.rst @@ -1,11 +1,4 @@ -.. 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/userspace-api/media/fdl-appendix.rst. -.. -.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. _image-process-controls: @@ -27,25 +20,26 @@ Image Process Control IDs ``V4L2_CID_IMAGE_PROC_CLASS (class)`` The IMAGE_PROC class descriptor. +.. _v4l2-cid-link-freq: + ``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. + The frequency of the data bus (e.g. parallel or CSI-2). + +.. _v4l2-cid-pixel-rate: ``V4L2_CID_PIXEL_RATE (64-bit integer)`` - Pixel rate in the source pads of the subdev. This control is + Pixel sampling rate in the device's pixel array. This control is read-only and its unit is pixels / second. + Some devices use horizontal and vertical blanking to configure the frame + rate. The frame rate can be calculated from the pixel rate, analogue crop + rectangle as well as horizontal and vertical blanking. The pixel rate + control may be present in a different sub-device than the blanking controls + and the analogue crop rectangle configuration. + + The configuration of the frame rate is performed by selecting the desired + horizontal and vertical blanking. The unit of this control is Hz. + ``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 |