OpenCloudOS-Kernel/Documentation/media/uapi/v4l/pixfmt-yuv411p.rst

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.. 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/media/uapi/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