64e4954619
The conversion script added some comments at the end. They point to the original DocBook files, with will be removed after the manual fixes. So, they'll be pointing to nowere. So, remove those comments. They'll be forever stored at the Kernel tree. So, if someone wants the references, it is just a matter of looking at the backlog. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
255 lines
3.5 KiB
ReStructuredText
255 lines
3.5 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _V4L2-PIX-FMT-YUV420M:
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************************************************************
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V4L2_PIX_FMT_YUV420M ('YM12'), V4L2_PIX_FMT_YVU420M ('YM21')
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************************************************************
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*man V4L2_PIX_FMT_YUV420M(2)*
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V4L2_PIX_FMT_YVU420M
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Variation of ``V4L2_PIX_FMT_YUV420`` and ``V4L2_PIX_FMT_YVU420`` with
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planes non contiguous in memory.
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Description
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===========
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This is a multi-planar format, as opposed to a packed format. The three
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components are separated into three sub-images or planes.
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The Y plane is first. The Y plane has one byte per pixel. For
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``V4L2_PIX_FMT_YUV420M`` the Cb data constitutes the second plane which
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is half the width and half the height of the Y plane (and of the image).
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Each Cb belongs to four pixels, a two-by-two square of the image. For
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example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`,
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Y'\ :sub:`10`, and Y'\ :sub:`11`. The Cr data, just like the Cb plane,
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is in the third plane.
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``V4L2_PIX_FMT_YVU420M`` is the same except the Cr data is stored in the
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second plane and the Cb data in the third plane.
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If the Y plane has pad bytes after each row, then the Cb and Cr planes
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have half as many pad bytes after their rows. In other words, two Cx
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rows (including padding) is exactly as long as one Y row (including
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padding).
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``V4L2_PIX_FMT_YUV420M`` and ``V4L2_PIX_FMT_YVU420M`` are intended to be
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used only in drivers and applications that support the multi-planar API,
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described in :ref:`planar-apis`.
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**Byte Order..**
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Each cell is one byte.
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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:widths: 2 1 1 1 1
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- .. row 1
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- start0 + 0:
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- Y'\ :sub:`00`
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- Y'\ :sub:`01`
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- Y'\ :sub:`02`
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- Y'\ :sub:`03`
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- .. row 2
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- start0 + 4:
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- Y'\ :sub:`10`
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- Y'\ :sub:`11`
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- Y'\ :sub:`12`
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- Y'\ :sub:`13`
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- .. row 3
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- start0 + 8:
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- Y'\ :sub:`20`
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- Y'\ :sub:`21`
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- Y'\ :sub:`22`
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- Y'\ :sub:`23`
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- .. row 4
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- start0 + 12:
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- Y'\ :sub:`30`
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- Y'\ :sub:`31`
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- Y'\ :sub:`32`
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- Y'\ :sub:`33`
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- .. row 5
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-
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- .. row 6
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- start1 + 0:
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- Cb\ :sub:`00`
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- Cb\ :sub:`01`
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- .. row 7
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- start1 + 2:
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- Cb\ :sub:`10`
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- Cb\ :sub:`11`
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- .. row 8
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-
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- .. row 9
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- start2 + 0:
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- Cr\ :sub:`00`
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- Cr\ :sub:`01`
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- .. row 10
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- start2 + 2:
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- Cr\ :sub:`10`
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- Cr\ :sub:`11`
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**Color Sample Location..**
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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-
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- 0
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-
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- 1
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-
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- 2
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-
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- 3
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- .. row 2
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- 0
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- Y
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-
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- Y
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-
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- Y
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-
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- Y
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- .. row 3
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-
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-
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- C
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-
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-
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-
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- C
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-
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- .. row 4
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- 1
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- Y
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-
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- Y
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-
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- Y
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-
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- Y
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- .. row 5
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-
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- .. row 6
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- 2
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- Y
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-
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- Y
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-
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- Y
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-
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- Y
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- .. row 7
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-
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-
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- C
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-
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-
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-
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- C
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-
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- .. row 8
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- 3
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- Y
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-
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- Y
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-
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- Y
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-
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- Y
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