137 lines
2.8 KiB
ReStructuredText
137 lines
2.8 KiB
ReStructuredText
.. Permission is granted to copy, distribute and/or modify this
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.. document under the terms of the GNU Free Documentation License,
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.. Version 1.1 or any later version published by the Free Software
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.. Foundation, with no Invariant Sections, no Front-Cover Texts
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.. and no Back-Cover Texts. A copy of the license is included at
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.. Documentation/media/uapi/fdl-appendix.rst.
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..
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.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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.. _V4L2-PIX-FMT-YUV422P:
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*****************************
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V4L2_PIX_FMT_YUV422P ('422P')
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*****************************
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Format with ½ horizontal chroma resolution, also known as YUV 4:2:2.
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Planar layout as opposed to ``V4L2_PIX_FMT_YUYV``
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Description
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===========
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This format is not commonly used. This is a planar version of the YUYV
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format. The three components are separated into three sub-images or
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planes. The Y plane is first. The Y plane has one byte per pixel. The Cb
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plane immediately follows the Y plane in memory. The Cb plane is half
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the width of the Y plane (and of the image). Each Cb belongs to two
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pixels. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`,
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Y'\ :sub:`01`. Following the Cb plane is the Cr plane, just like the Cb
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plane.
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If the Y plane has pad bytes after each row, then the Cr and Cb 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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**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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* - start + 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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* - start + 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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* - start + 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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* - start + 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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* - start + 16:
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- Cb\ :sub:`00`
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- Cb\ :sub:`01`
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* - start + 18:
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- Cb\ :sub:`10`
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- Cb\ :sub:`11`
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* - start + 20:
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- Cb\ :sub:`20`
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- Cb\ :sub:`21`
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* - start + 22:
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- Cb\ :sub:`30`
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- Cb\ :sub:`31`
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* - start + 24:
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- Cr\ :sub:`00`
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- Cr\ :sub:`01`
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* - start + 26:
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- Cr\ :sub:`10`
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- Cr\ :sub:`11`
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* - start + 28:
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- Cr\ :sub:`20`
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- Cr\ :sub:`21`
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* - start + 30:
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- Cr\ :sub:`30`
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- Cr\ :sub:`31`
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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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* -
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- 0
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-
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- 1
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- 2
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-
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- 3
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* - 0
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- Y
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- C
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- Y
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- Y
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- C
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- Y
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* - 1
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- Y
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- C
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- Y
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- Y
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- C
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- Y
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* - 2
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- Y
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- C
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- Y
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- Y
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- C
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- Y
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* - 3
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- Y
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- C
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- Y
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- Y
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- C
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- Y
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