mirror of https://gitee.com/openkylin/linux.git
158 lines
3.0 KiB
ReStructuredText
158 lines
3.0 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _V4L2-PIX-FMT-NV16M:
|
|
.. _v4l2-pix-fmt-nv61m:
|
|
|
|
********************************************************
|
|
V4L2_PIX_FMT_NV16M ('NM16'), V4L2_PIX_FMT_NV61M ('NM61')
|
|
********************************************************
|
|
|
|
V4L2_PIX_FMT_NV61M
|
|
Variation of ``V4L2_PIX_FMT_NV16`` and ``V4L2_PIX_FMT_NV61`` with planes
|
|
non contiguous in memory.
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
This is a multi-planar, two-plane version of the YUV 4:2:2 format. The
|
|
three components are separated into two sub-images or planes.
|
|
``V4L2_PIX_FMT_NV16M`` differs from ``V4L2_PIX_FMT_NV16`` in that the
|
|
two planes are non-contiguous in memory, i.e. the chroma plane does not
|
|
necessarily immediately follow the luma plane. The luminance data
|
|
occupies the first plane. The Y plane has one byte per pixel. In the
|
|
second plane there is chrominance data with alternating chroma samples.
|
|
The CbCr plane is the same width and height, in bytes, as the Y plane.
|
|
Each CbCr pair belongs to two pixels. For example,
|
|
Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`.
|
|
``V4L2_PIX_FMT_NV61M`` is the same as ``V4L2_PIX_FMT_NV16M`` except the
|
|
Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.
|
|
|
|
``V4L2_PIX_FMT_NV16M`` and ``V4L2_PIX_FMT_NV61M`` 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`
|
|
- Cr\ :sub:`00`
|
|
- Cb\ :sub:`02`
|
|
- Cr\ :sub:`02`
|
|
* - start1 + 4:
|
|
- Cb\ :sub:`10`
|
|
- Cr\ :sub:`10`
|
|
- Cb\ :sub:`12`
|
|
- Cr\ :sub:`12`
|
|
* - start1 + 8:
|
|
- Cb\ :sub:`20`
|
|
- Cr\ :sub:`20`
|
|
- Cb\ :sub:`22`
|
|
- Cr\ :sub:`22`
|
|
* - start1 + 12:
|
|
- Cb\ :sub:`30`
|
|
- Cr\ :sub:`30`
|
|
- Cb\ :sub:`32`
|
|
- Cr\ :sub:`32`
|
|
|
|
|
|
**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
|
|
* -
|
|
-
|
|
- C
|
|
-
|
|
-
|
|
- C
|
|
-
|
|
* -
|
|
* - 2
|
|
- Y
|
|
-
|
|
- Y
|
|
- Y
|
|
-
|
|
- Y
|
|
* -
|
|
-
|
|
- C
|
|
-
|
|
-
|
|
- C
|
|
-
|
|
* - 3
|
|
- Y
|
|
-
|
|
- Y
|
|
- Y
|
|
-
|
|
- Y
|
|
* -
|
|
-
|
|
- C
|
|
-
|
|
-
|
|
- C
|
|
-
|