54f38fcae5
Since 2017, there is an space reserved for userspace API,
created by changeset 1d596dee3862 ("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>
123 lines
2.7 KiB
ReStructuredText
123 lines
2.7 KiB
ReStructuredText
.. Permission is granted to copy, distribute and/or modify this
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.. document under the terms of the GNU Free Documentation License,
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.. Version 1.1 or any later version published by the Free Software
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.. Foundation, with no Invariant Sections, no Front-Cover Texts
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.. and no Back-Cover Texts. A copy of the license is included at
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.. Documentation/userspace-api/media/fdl-appendix.rst.
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..
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.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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.. _V4L2-PIX-FMT-YUV411P:
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*****************************
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V4L2_PIX_FMT_YUV411P ('411P')
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*****************************
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Format with ¼ horizontal chroma resolution, also known as YUV 4:1:1.
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Planar layout as opposed to ``V4L2_PIX_FMT_Y41P``
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Description
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===========
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This format is not commonly used. This is a planar format similar to the
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4:2:2 planar format except with half as many chroma. The three
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components are separated into three sub-images or planes. The Y plane is
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first. The Y plane has one byte per pixel. The Cb plane immediately
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follows the Y plane in memory. The Cb plane is ¼ the width of the Y
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plane (and of the image). Each Cb belongs to 4 pixels all on the same
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row. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`,
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Y'\ :sub:`02` and Y'\ :sub:`03`. Following the Cb plane is the Cr plane,
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just like the Cb plane.
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If the Y plane has pad bytes after each row, then the Cr and Cb planes
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have ¼ as many pad bytes after their rows. In other words, four C x rows
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(including padding) is exactly as long as one Y row (including padding).
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**Byte Order.**
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Each cell is one byte.
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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* - start + 0:
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- Y'\ :sub:`00`
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- Y'\ :sub:`01`
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- Y'\ :sub:`02`
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- Y'\ :sub:`03`
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* - start + 4:
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- Y'\ :sub:`10`
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- Y'\ :sub:`11`
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- Y'\ :sub:`12`
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- Y'\ :sub:`13`
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* - start + 8:
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- Y'\ :sub:`20`
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- Y'\ :sub:`21`
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- Y'\ :sub:`22`
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- Y'\ :sub:`23`
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* - start + 12:
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- Y'\ :sub:`30`
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- Y'\ :sub:`31`
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- Y'\ :sub:`32`
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- Y'\ :sub:`33`
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* - start + 16:
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- Cb\ :sub:`00`
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* - start + 17:
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- Cb\ :sub:`10`
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* - start + 18:
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- Cb\ :sub:`20`
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* - start + 19:
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- Cb\ :sub:`30`
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* - start + 20:
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- Cr\ :sub:`00`
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* - start + 21:
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- Cr\ :sub:`10`
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* - start + 22:
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- Cr\ :sub:`20`
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* - start + 23:
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- Cr\ :sub:`30`
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**Color Sample Location:**
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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* -
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- 0
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- 1
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-
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- 2
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- 3
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* - 0
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- Y
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- Y
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- C
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- Y
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- Y
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* - 1
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- Y
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- Y
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- C
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- Y
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- Y
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* - 2
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- Y
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- Y
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- C
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- Y
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- Y
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* - 3
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- Y
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- Y
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- C
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- Y
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- Y
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