116 lines
2.3 KiB
ReStructuredText
116 lines
2.3 KiB
ReStructuredText
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.. -*- coding: utf-8; mode: rst -*-
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.. _V4L2-PIX-FMT-YUV411P:
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*****************************
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V4L2_PIX_FMT_YUV411P ('411P')
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*****************************
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Format with ¼ horizontal chroma resolution, also known as YUV 4:1:1.
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Planar layout as opposed to ``V4L2_PIX_FMT_Y41P``
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Description
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===========
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This format is not commonly used. This is a planar format similar to the
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4:2:2 planar format except with half as many chroma. The three
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components are separated into three sub-images or planes. The Y plane is
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first. The Y plane has one byte per pixel. The Cb plane immediately
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follows the Y plane in memory. The Cb plane is ¼ the width of the Y
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plane (and of the image). Each Cb belongs to 4 pixels all on the same
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row. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`,
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Y'\ :sub:`02` and Y'\ :sub:`03`. Following the Cb plane is the Cr plane,
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just like the Cb 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 ¼ as many pad bytes after their rows. In other words, four C x rows
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(including padding) is exactly as long as one Y row (including 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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* - start + 17:
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- Cb\ :sub:`10`
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* - start + 18:
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- Cb\ :sub:`20`
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* - start + 19:
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- Cb\ :sub:`30`
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* - start + 20:
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- Cr\ :sub:`00`
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* - start + 21:
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- Cr\ :sub:`10`
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* - start + 22:
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- Cr\ :sub:`20`
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* - start + 23:
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- Cr\ :sub:`30`
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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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- 1
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-
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- 2
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- 3
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* - 0
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- Y
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- Y
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- C
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- Y
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- Y
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* - 1
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- Y
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- Y
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- C
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- Y
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- Y
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* - 2
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- Y
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- Y
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- C
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- Y
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- Y
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* - 3
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- Y
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- Y
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- C
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- Y
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- Y
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