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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>
135 lines
2.7 KiB
ReStructuredText
135 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-YVU410:
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.. _v4l2-pix-fmt-yuv410:
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**********************************************************
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V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')
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**********************************************************
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V4L2_PIX_FMT_YUV410
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Planar formats with ¼ horizontal and vertical chroma resolution, also
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known as YUV 4:1:0
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Description
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===========
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These are planar formats, as opposed to a packed format. 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. For ``V4L2_PIX_FMT_YVU410``,
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the Cr plane immediately follows the Y plane in memory. The Cr plane is
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¼ the width and ¼ the height of the Y plane (and of the image). Each Cr
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belongs to 16 pixels, a four-by-four square of the image. Following the
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Cr plane is the Cb plane, just like the Cr plane.
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``V4L2_PIX_FMT_YUV410`` is the same, except the Cb plane comes first,
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then the Cr 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 Cx rows
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(including padding) are exactly as long as one Y row (including
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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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- Cr\ :sub:`00`
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* - start + 17:
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- Cb\ :sub:`00`
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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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- Y
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