54f38fcae5
Since 2017, there is an space reserved for userspace API,
created by changeset 1d596dee38 ("docs: Create a user-space API guide").
As the media subsystem was one of the first subsystems to use
Sphinx, until this patch, we were keeping things on a separate
place.
Let's just use the new location, as having all uAPI altogether
will likely make things easier for developers.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
137 lines
2.8 KiB
ReStructuredText
137 lines
2.8 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/userspace-api/media/fdl-appendix.rst.
|
|
..
|
|
.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
|
|
|
|
.. _V4L2-PIX-FMT-YUV422P:
|
|
|
|
*****************************
|
|
V4L2_PIX_FMT_YUV422P ('422P')
|
|
*****************************
|
|
|
|
|
|
Format with ½ horizontal chroma resolution, also known as YUV 4:2:2.
|
|
Planar layout as opposed to ``V4L2_PIX_FMT_YUYV``
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
This format is not commonly used. This is a planar version of the YUYV
|
|
format. The three components are separated into three sub-images or
|
|
planes. The Y plane is first. The Y plane has one byte per pixel. The Cb
|
|
plane immediately follows the Y plane in memory. The Cb plane is half
|
|
the width of the Y plane (and of the image). Each Cb belongs to two
|
|
pixels. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`,
|
|
Y'\ :sub:`01`. Following the Cb plane is the Cr plane, just like the Cb
|
|
plane.
|
|
|
|
If the Y plane has pad bytes after each row, then the Cr and Cb planes
|
|
have half as many pad bytes after their rows. In other words, two Cx
|
|
rows (including padding) is exactly as long as one Y row (including
|
|
padding).
|
|
|
|
**Byte Order.**
|
|
Each cell is one byte.
|
|
|
|
|
|
|
|
|
|
.. flat-table::
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
|
|
* - start + 0:
|
|
- Y'\ :sub:`00`
|
|
- Y'\ :sub:`01`
|
|
- Y'\ :sub:`02`
|
|
- Y'\ :sub:`03`
|
|
* - start + 4:
|
|
- Y'\ :sub:`10`
|
|
- Y'\ :sub:`11`
|
|
- Y'\ :sub:`12`
|
|
- Y'\ :sub:`13`
|
|
* - start + 8:
|
|
- Y'\ :sub:`20`
|
|
- Y'\ :sub:`21`
|
|
- Y'\ :sub:`22`
|
|
- Y'\ :sub:`23`
|
|
* - start + 12:
|
|
- Y'\ :sub:`30`
|
|
- Y'\ :sub:`31`
|
|
- Y'\ :sub:`32`
|
|
- Y'\ :sub:`33`
|
|
* - start + 16:
|
|
- Cb\ :sub:`00`
|
|
- Cb\ :sub:`01`
|
|
* - start + 18:
|
|
- Cb\ :sub:`10`
|
|
- Cb\ :sub:`11`
|
|
* - start + 20:
|
|
- Cb\ :sub:`20`
|
|
- Cb\ :sub:`21`
|
|
* - start + 22:
|
|
- Cb\ :sub:`30`
|
|
- Cb\ :sub:`31`
|
|
* - start + 24:
|
|
- Cr\ :sub:`00`
|
|
- Cr\ :sub:`01`
|
|
* - start + 26:
|
|
- Cr\ :sub:`10`
|
|
- Cr\ :sub:`11`
|
|
* - start + 28:
|
|
- Cr\ :sub:`20`
|
|
- Cr\ :sub:`21`
|
|
* - start + 30:
|
|
- Cr\ :sub:`30`
|
|
- Cr\ :sub:`31`
|
|
|
|
|
|
**Color Sample Location:**
|
|
|
|
|
|
|
|
.. flat-table::
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
|
|
* -
|
|
- 0
|
|
-
|
|
- 1
|
|
- 2
|
|
-
|
|
- 3
|
|
* - 0
|
|
- Y
|
|
- C
|
|
- Y
|
|
- Y
|
|
- C
|
|
- Y
|
|
* - 1
|
|
- Y
|
|
- C
|
|
- Y
|
|
- Y
|
|
- C
|
|
- Y
|
|
* - 2
|
|
- Y
|
|
- C
|
|
- Y
|
|
- Y
|
|
- C
|
|
- Y
|
|
* - 3
|
|
- Y
|
|
- C
|
|
- Y
|
|
- Y
|
|
- C
|
|
- Y
|