127 lines
2.1 KiB
ReStructuredText
127 lines
2.1 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _V4L2-PIX-FMT-M420:
|
|
|
|
**************************
|
|
V4L2_PIX_FMT_M420 ('M420')
|
|
**************************
|
|
|
|
Format with ½ horizontal and vertical chroma resolution, also known as
|
|
YUV 4:2:0. Hybrid plane line-interleaved layout.
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
M420 is a YUV format with ½ horizontal and vertical chroma subsampling
|
|
(YUV 4:2:0). Pixels are organized as interleaved luma and chroma planes.
|
|
Two lines of luma data are followed by one line of chroma data.
|
|
|
|
The luma plane has one byte per pixel. The chroma plane contains
|
|
interleaved CbCr pixels subsampled by ½ in the horizontal and vertical
|
|
directions. Each CbCr pair belongs to four pixels. For example,
|
|
Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`,
|
|
Y'\ :sub:`10`, Y'\ :sub:`11`.
|
|
|
|
All line lengths are identical: if the Y lines include pad bytes so do
|
|
the CbCr lines.
|
|
|
|
**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:
|
|
- Cb\ :sub:`00`
|
|
- Cr\ :sub:`00`
|
|
- Cb\ :sub:`01`
|
|
- Cr\ :sub:`01`
|
|
* - start + 16:
|
|
- Y'\ :sub:`20`
|
|
- Y'\ :sub:`21`
|
|
- Y'\ :sub:`22`
|
|
- Y'\ :sub:`23`
|
|
* - start + 20:
|
|
- Y'\ :sub:`30`
|
|
- Y'\ :sub:`31`
|
|
- Y'\ :sub:`32`
|
|
- Y'\ :sub:`33`
|
|
* - start + 24:
|
|
- Cb\ :sub:`10`
|
|
- Cr\ :sub:`10`
|
|
- Cb\ :sub:`11`
|
|
- Cr\ :sub:`11`
|
|
|
|
|
|
**Color Sample Location:**
|
|
|
|
|
|
|
|
.. flat-table::
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
|
|
* -
|
|
- 0
|
|
-
|
|
- 1
|
|
- 2
|
|
-
|
|
- 3
|
|
* - 0
|
|
- Y
|
|
-
|
|
- Y
|
|
- Y
|
|
-
|
|
- Y
|
|
* -
|
|
-
|
|
- C
|
|
-
|
|
-
|
|
- C
|
|
-
|
|
* - 1
|
|
- Y
|
|
-
|
|
- Y
|
|
- Y
|
|
-
|
|
- Y
|
|
* -
|
|
* - 2
|
|
- Y
|
|
-
|
|
- Y
|
|
- Y
|
|
-
|
|
- Y
|
|
* -
|
|
-
|
|
- C
|
|
-
|
|
-
|
|
- C
|
|
-
|
|
* - 3
|
|
- Y
|
|
-
|
|
- Y
|
|
- Y
|
|
-
|
|
- Y
|