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>
65 lines
1.9 KiB
ReStructuredText
65 lines
1.9 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
|
|
|
|
.. _yuv-formats:
|
|
|
|
***********
|
|
YUV Formats
|
|
***********
|
|
|
|
YUV is the format native to TV broadcast and composite video signals. It
|
|
separates the brightness information (Y) from the color information (U
|
|
and V or Cb and Cr). The color information consists of red and blue
|
|
*color difference* signals, this way the green component can be
|
|
reconstructed by subtracting from the brightness component. See
|
|
:ref:`colorspaces` for conversion examples. YUV was chosen because
|
|
early television would only transmit brightness information. To add
|
|
color in a way compatible with existing receivers a new signal carrier
|
|
was added to transmit the color difference signals. Secondary in the YUV
|
|
format the U and V components usually have lower resolution than the Y
|
|
component. This is an analog video compression technique taking
|
|
advantage of a property of the human visual system, being more sensitive
|
|
to brightness information.
|
|
|
|
|
|
.. toctree::
|
|
:maxdepth: 1
|
|
|
|
pixfmt-packed-yuv
|
|
pixfmt-grey
|
|
pixfmt-y10
|
|
pixfmt-y12
|
|
pixfmt-y14
|
|
pixfmt-y10b
|
|
pixfmt-y10p
|
|
pixfmt-y16
|
|
pixfmt-y16-be
|
|
pixfmt-y8i
|
|
pixfmt-y12i
|
|
pixfmt-uv8
|
|
pixfmt-yuyv
|
|
pixfmt-uyvy
|
|
pixfmt-yvyu
|
|
pixfmt-vyuy
|
|
pixfmt-y41p
|
|
pixfmt-yuv420
|
|
pixfmt-yuv420m
|
|
pixfmt-yuv422m
|
|
pixfmt-yuv444m
|
|
pixfmt-yuv410
|
|
pixfmt-yuv422p
|
|
pixfmt-yuv411p
|
|
pixfmt-nv12
|
|
pixfmt-nv12m
|
|
pixfmt-nv12mt
|
|
pixfmt-nv16
|
|
pixfmt-nv16m
|
|
pixfmt-nv24
|
|
pixfmt-m420
|