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54f38fcae5
Since 2017, there is an space reserved for userspace API,
created by changeset 1d596dee38 ("docs: Create a user-space API guide").
As the media subsystem was one of the first subsystems to use
Sphinx, until this patch, we were keeping things on a separate
place.
Let's just use the new location, as having all uAPI altogether
will likely make things easier for developers.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
165 lines
3.4 KiB
ReStructuredText
165 lines
3.4 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/userspace-api/media/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-NV16M:
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.. _v4l2-pix-fmt-nv61m:
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********************************************************
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V4L2_PIX_FMT_NV16M ('NM16'), V4L2_PIX_FMT_NV61M ('NM61')
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********************************************************
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V4L2_PIX_FMT_NV61M
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Variation of ``V4L2_PIX_FMT_NV16`` and ``V4L2_PIX_FMT_NV61`` with planes
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non contiguous in memory.
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Description
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===========
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This is a multi-planar, two-plane version of the YUV 4:2:2 format. The
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three components are separated into two sub-images or planes.
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``V4L2_PIX_FMT_NV16M`` differs from ``V4L2_PIX_FMT_NV16`` in that the
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two planes are non-contiguous in memory, i.e. the chroma plane does not
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necessarily immediately follow the luma plane. The luminance data
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occupies the first plane. The Y plane has one byte per pixel. In the
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second plane there is chrominance data with alternating chroma samples.
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The CbCr plane is the same width and height, in bytes, as the Y plane.
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Each CbCr pair belongs to two 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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``V4L2_PIX_FMT_NV61M`` is the same as ``V4L2_PIX_FMT_NV16M`` except the
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Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.
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``V4L2_PIX_FMT_NV16M`` and ``V4L2_PIX_FMT_NV61M`` 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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* - 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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* - 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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* - 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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* - 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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* -
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* - start1 + 0:
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- Cb\ :sub:`00`
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- Cr\ :sub:`00`
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- Cb\ :sub:`02`
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- Cr\ :sub:`02`
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* - start1 + 4:
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- Cb\ :sub:`10`
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- Cr\ :sub:`10`
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- Cb\ :sub:`12`
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- Cr\ :sub:`12`
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* - start1 + 8:
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- Cb\ :sub:`20`
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- Cr\ :sub:`20`
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- Cb\ :sub:`22`
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- Cr\ :sub:`22`
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* - start1 + 12:
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- Cb\ :sub:`30`
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- Cr\ :sub:`30`
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- Cb\ :sub:`32`
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- Cr\ :sub:`32`
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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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- Y
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- Y
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* -
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