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.. -*- coding: utf-8; mode: rst -*-
.. _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
|
