72 lines
1.7 KiB
ReStructuredText
72 lines
1.7 KiB
ReStructuredText
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. _V4L2-PIX-FMT-M420:
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**************************
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V4L2_PIX_FMT_M420 ('M420')
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**************************
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Format with ½ horizontal and vertical chroma resolution, also known as
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YUV 4:2:0. Hybrid plane line-interleaved layout.
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Description
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===========
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M420 is a YUV format with ½ horizontal and vertical chroma subsampling
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(YUV 4:2:0). Pixels are organized as interleaved luma and chroma planes.
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Two lines of luma data are followed by one line of chroma data.
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The luma plane has one byte per pixel. The chroma plane contains
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interleaved CbCr pixels subsampled by ½ in the horizontal and vertical
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directions. Each CbCr pair belongs to four pixels. For example,
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Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`,
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Y'\ :sub:`10`, Y'\ :sub:`11`.
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All line lengths are identical: if the Y lines include pad bytes so do
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the CbCr lines.
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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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- Cb\ :sub:`00`
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- Cr\ :sub:`00`
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- Cb\ :sub:`01`
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- Cr\ :sub:`01`
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* - start + 16:
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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 + 20:
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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 + 24:
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- Cb\ :sub:`10`
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- Cr\ :sub:`10`
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- Cb\ :sub:`11`
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- Cr\ :sub:`11`
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**Color Sample Location:**
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Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
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horizontally and vertically.
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