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author | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-03-04 10:21:39 +0100 |
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committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-04-14 10:31:49 +0200 |
commit | 54f38fcae536ea202ce7d6a359521492fba30c1f (patch) | |
tree | dd1a2b36d8de0b13702f2716526ad3b91650e090 /Documentation/userspace-api/media/v4l/pixfmt-yuv411p.rst | |
parent | 5dfb8db56b273740a76e8687ee7efb4b2c0ec83b (diff) |
media: docs: move uAPI book to userspace-api/media
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>
Diffstat (limited to 'Documentation/userspace-api/media/v4l/pixfmt-yuv411p.rst')
-rw-r--r-- | Documentation/userspace-api/media/v4l/pixfmt-yuv411p.rst | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv411p.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv411p.rst new file mode 100644 index 000000000000..967ba7ce41a2 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv411p.rst @@ -0,0 +1,122 @@ +.. 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-YUV411P: + +***************************** +V4L2_PIX_FMT_YUV411P ('411P') +***************************** + + +Format with ¼ horizontal chroma resolution, also known as YUV 4:1:1. +Planar layout as opposed to ``V4L2_PIX_FMT_Y41P`` + + +Description +=========== + +This format is not commonly used. This is a planar format similar to the +4:2:2 planar format except with half as many chroma. 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 ¼ the width of the Y +plane (and of the image). Each Cb belongs to 4 pixels all on the same +row. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`, +Y'\ :sub:`02` and Y'\ :sub:`03`. 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 ¼ as many pad bytes after their rows. In other words, four C x 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` + * - start + 17: + - Cb\ :sub:`10` + * - start + 18: + - Cb\ :sub:`20` + * - start + 19: + - Cb\ :sub:`30` + * - start + 20: + - Cr\ :sub:`00` + * - start + 21: + - Cr\ :sub:`10` + * - start + 22: + - Cr\ :sub:`20` + * - start + 23: + - Cr\ :sub:`30` + + +**Color Sample Location:** + + + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + * - + - 0 + - 1 + - + - 2 + - 3 + * - 0 + - Y + - Y + - C + - Y + - Y + * - 1 + - Y + - Y + - C + - Y + - Y + * - 2 + - Y + - Y + - C + - Y + - Y + * - 3 + - Y + - Y + - C + - Y + - Y |