142 lines
2.8 KiB
ReStructuredText
142 lines
2.8 KiB
ReStructuredText
|
.. -*- coding: utf-8; mode: rst -*-
|
||
|
|
|
||
|
|
.. _V4L2-PIX-FMT-YUV422M:
|
||
|
|
.. _v4l2-pix-fmt-yvu422m:
|
||
|
|
|
||
|
|
************************************************************
|
||
|
|
V4L2_PIX_FMT_YUV422M ('YM16'), V4L2_PIX_FMT_YVU422M ('YM61')
|
||
|
|
************************************************************
|
||
|
|
|
||
|
|
|
||
|
|
V4L2_PIX_FMT_YVU422M
|
||
|
|
Planar formats with ½ horizontal resolution, also known as YUV and YVU
|
||
|
|
4:2:2
|
||
|
|
|
||
|
|
|
||
|
|
Description
|
||
|
|
===========
|
||
|
|
|
||
|
|
This is a multi-planar format, as opposed to a packed format. The three
|
||
|
|
components are separated into three sub-images or planes.
|
||
|
|
|
||
|
|
The Y plane is first. The Y plane has one byte per pixel. For
|
||
|
|
``V4L2_PIX_FMT_YUV422M`` the Cb data constitutes the second plane which
|
||
|
|
is half the width of the Y plane (and of the image). Each Cb belongs to
|
||
|
|
two pixels. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`,
|
||
|
|
Y'\ :sub:`01`. The Cr data, just like the Cb plane, is in the third
|
||
|
|
plane.
|
||
|
|
|
||
|
|
``V4L2_PIX_FMT_YVU422M`` is the same except the Cr data is stored in the
|
||
|
|
second plane and the Cb data in the third plane.
|
||
|
|
|
||
|
|
If the Y plane has pad bytes after each row, then the Cb and Cr planes
|
||
|
|
have half as many pad bytes after their rows. In other words, two Cx
|
||
|
|
rows (including padding) is exactly as long as one Y row (including
|
||
|
|
padding).
|
||
|
|
|
||
|
|
``V4L2_PIX_FMT_YUV422M`` and ``V4L2_PIX_FMT_YVU422M`` are intended to be
|
||
|
|
used only in drivers and applications that support the multi-planar API,
|
||
|
|
described in :ref:`planar-apis`.
|
||
|
|
|
||
|
|
**Byte Order.**
|
||
|
|
Each cell is one byte.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
.. flat-table::
|
||
|
|
:header-rows: 0
|
||
|
|
:stub-columns: 0
|
||
|
|
|
||
|
|
* - start0 + 0:
|
||
|
|
- Y'\ :sub:`00`
|
||
|
|
- Y'\ :sub:`01`
|
||
|
|
- Y'\ :sub:`02`
|
||
|
|
- Y'\ :sub:`03`
|
||
|
|
* - start0 + 4:
|
||
|
|
- Y'\ :sub:`10`
|
||
|
|
- Y'\ :sub:`11`
|
||
|
|
- Y'\ :sub:`12`
|
||
|
|
- Y'\ :sub:`13`
|
||
|
|
* - start0 + 8:
|
||
|
|
- Y'\ :sub:`20`
|
||
|
|
- Y'\ :sub:`21`
|
||
|
|
- Y'\ :sub:`22`
|
||
|
|
- Y'\ :sub:`23`
|
||
|
|
* - start0 + 12:
|
||
|
|
- Y'\ :sub:`30`
|
||
|
|
- Y'\ :sub:`31`
|
||
|
|
- Y'\ :sub:`32`
|
||
|
|
- Y'\ :sub:`33`
|
||
|
|
* -
|
||
|
|
* - start1 + 0:
|
||
|
|
- Cb\ :sub:`00`
|
||
|
|
- Cb\ :sub:`01`
|
||
|
|
* - start1 + 2:
|
||
|
|
- Cb\ :sub:`10`
|
||
|
|
- Cb\ :sub:`11`
|
||
|
|
* - start1 + 4:
|
||
|
|
- Cb\ :sub:`20`
|
||
|
|
- Cb\ :sub:`21`
|
||
|
|
* - start1 + 6:
|
||
|
|
- Cb\ :sub:`30`
|
||
|
|
- Cb\ :sub:`31`
|
||
|
|
* -
|
||
|
|
* - start2 + 0:
|
||
|
|
- Cr\ :sub:`00`
|
||
|
|
- Cr\ :sub:`01`
|
||
|
|
* - start2 + 2:
|
||
|
|
- Cr\ :sub:`10`
|
||
|
|
- Cr\ :sub:`11`
|
||
|
|
* - start2 + 4:
|
||
|
|
- Cr\ :sub:`20`
|
||
|
|
- Cr\ :sub:`21`
|
||
|
|
* - start2 + 6:
|
||
|
|
- Cr\ :sub:`30`
|
||
|
|
- Cr\ :sub:`31`
|
||
|
|
|
||
|
|
|
||
|
|
**Color Sample Location:**
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
.. flat-table::
|
||
|
|
:header-rows: 0
|
||
|
|
:stub-columns: 0
|
||
|
|
|
||
|
|
* -
|
||
|
|
- 0
|
||
|
|
-
|
||
|
|
- 1
|
||
|
|
- 2
|
||
|
|
-
|
||
|
|
- 3
|
||
|
|
* - 0
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|
||
|
|
* - 1
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|
||
|
|
* - 2
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|
||
|
|
* - 3
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|
||
|
|
- Y
|
||
|
|
- C
|
||
|
|
- Y
|