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media: doc: pixfmt-yuv: Move all semi-planar YUV formats to common file 

Semi-planar pixel formats are documented in separate files. This
duplicates information, as those formats share comon traits. Consolidate
them in a single file and summarize their descriptions in a single
table.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Laurent Pinchart 2020-12-07 00:03:15 +01:00 коммит произвёл Mauro Carvalho Chehab
Родитель af4f450576
Коммит da785536e0
8 изменённых файлов: 464 добавлений и 497 удалений
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76
Documentation/userspace-api/media/v4l/pixfmt-nv12.rst
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _V4L2-PIX-FMT-NV12:
.. _V4L2-PIX-FMT-NV21:
******************************************************
V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')
******************************************************
V4L2_PIX_FMT_NV21
Formats with ½ horizontal and vertical chroma resolution, also known as
YUV 4:2:0. One luminance and one chrominance plane with alternating
chroma samples as opposed to ``V4L2_PIX_FMT_YVU420``
Description
===========
These are two-plane versions of the YUV 4:2:0 format. The three
components are separated into two sub-images or planes. The Y plane is
first. The Y plane has one byte per pixel. For ``V4L2_PIX_FMT_NV12``, a
combined CbCr plane immediately follows the Y plane in memory. The CbCr
plane is the same width, in bytes, as the Y plane (and of the image),
but is half as tall in pixels. Each CbCr pair belongs to four pixels.
For example, Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`,
Y'\ :sub:`01`, Y'\ :sub:`10`, Y'\ :sub:`11`. ``V4L2_PIX_FMT_NV21`` is
the same except the Cb and Cr bytes are swapped, the CrCb plane starts
with a Cr byte.
If the Y plane has pad bytes after each row, then the CbCr plane has as
many pad bytes after its rows.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 0
:stub-columns: 0
* - start + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* - start + 16:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
* - start + 20:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
**Color Sample Location:**
Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
horizontally and vertically.

88
Documentation/userspace-api/media/v4l/pixfmt-nv12m.rst
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _V4L2-PIX-FMT-NV12M:
.. _v4l2-pix-fmt-nv12mt-16x16:
.. _V4L2-PIX-FMT-NV21M:
***********************************************************************************
V4L2_PIX_FMT_NV12M ('NM12'), V4L2_PIX_FMT_NV21M ('NM21'), V4L2_PIX_FMT_NV12MT_16X16
***********************************************************************************
V4L2_PIX_FMT_NV21M
V4L2_PIX_FMT_NV12MT_16X16
Variation of ``V4L2_PIX_FMT_NV12`` and ``V4L2_PIX_FMT_NV21`` with planes
non contiguous in memory.
Description
===========
This is a multi-planar, two-plane version of the YUV 4:2:0 format. The
three components are separated into two sub-images or planes.
``V4L2_PIX_FMT_NV12M`` differs from ``V4L2_PIX_FMT_NV12`` in that the
two planes are non-contiguous in memory, i.e. the chroma plane do not
necessarily immediately follows the luma plane. The luminance data
occupies the first plane. The Y plane has one byte per pixel. In the
second plane there is a chrominance data with alternating chroma
samples. The CbCr plane is the same width, in bytes, as the Y plane (and
of the image), but is half as tall in pixels. Each CbCr pair belongs to
four pixels. For example, Cb\ :sub:`0`/Cr\ :sub:`0` belongs to
Y'\ :sub:`00`, Y'\ :sub:`01`, Y'\ :sub:`10`, Y'\ :sub:`11`.
``V4L2_PIX_FMT_NV12MT_16X16`` is the tiled version of
``V4L2_PIX_FMT_NV12M`` with 16x16 macroblock tiles. Here pixels are
arranged in 16x16 2D tiles and tiles are arranged in linear order in
memory. ``V4L2_PIX_FMT_NV21M`` is the same as ``V4L2_PIX_FMT_NV12M``
except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr
byte.
``V4L2_PIX_FMT_NV12M`` is intended to be used only in drivers and
applications that support the multi-planar API, described in
:ref:`planar-apis`.
If the Y plane has pad bytes after each row, then the CbCr plane has as
many pad bytes after its rows.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 0
:stub-columns: 0
* - start0 + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start0 + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start0 + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start0 + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* -
* - start1 + 0:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
* - start1 + 4:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
**Color Sample Location:**
Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
horizontally and vertically.

60
Documentation/userspace-api/media/v4l/pixfmt-nv12mt.rst
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _V4L2-PIX-FMT-NV12MT:
****************************
V4L2_PIX_FMT_NV12MT ('TM12')
****************************
Formats with ½ horizontal and vertical chroma resolution. This format
has two planes - one for luminance and one for chrominance. Chroma
samples are interleaved. The difference to ``V4L2_PIX_FMT_NV12`` is the
memory layout. Pixels are grouped in macroblocks of 64x32 size. The
order of macroblocks in memory is also not standard.
Description
===========
This is the two-plane versions of the YUV 4:2:0 format where data is
grouped into 64x32 macroblocks. The three components are separated into
two sub-images or planes. The Y plane has one byte per pixel and pixels
are grouped into 64x32 macroblocks. The CbCr plane has the same width,
in bytes, as the Y plane (and the image), but is half as tall in pixels.
The chroma plane is also grouped into 64x32 macroblocks.
Width of the buffer has to be aligned to the multiple of 128, and height
alignment is 32. Every four adjacent buffers - two horizontally and two
vertically are grouped together and are located in memory in Z or
flipped Z order.
Layout of macroblocks in memory is presented in the following figure.
.. _nv12mt:
.. kernel-figure:: nv12mt.svg
:alt: nv12mt.svg
:align: center
V4L2_PIX_FMT_NV12MT macroblock Z shape memory layout
The requirement that width is multiple of 128 is implemented because,
the Z shape cannot be cut in half horizontally. In case the vertical
resolution of macroblocks is odd then the last row of macroblocks is
arranged in a linear order.
In case of chroma the layout is identical. Cb and Cr samples are
interleaved. Height of the buffer is aligned to 32.
.. _nv12mt_ex:
.. kernel-figure:: nv12mt_example.svg
:alt: nv12mt_example.svg
:align: center
Example V4L2_PIX_FMT_NV12MT memory layout of macroblocks
Memory layout of macroblocks of ``V4L2_PIX_FMT_NV12MT`` format in most
extreme case.

84
Documentation/userspace-api/media/v4l/pixfmt-nv16.rst
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _V4L2-PIX-FMT-NV16:
.. _V4L2-PIX-FMT-NV61:
******************************************************
V4L2_PIX_FMT_NV16 ('NV16'), V4L2_PIX_FMT_NV61 ('NV61')
******************************************************
V4L2_PIX_FMT_NV61
Formats with ½ horizontal chroma resolution, also known as YUV 4:2:2.
One luminance and one chrominance plane with alternating chroma samples
as opposed to ``V4L2_PIX_FMT_YVU420``
Description
===========
These are two-plane versions of the YUV 4:2:2 format. The three
components are separated into two sub-images or planes. The Y plane is
first. The Y plane has one byte per pixel. For ``V4L2_PIX_FMT_NV16``, a
combined CbCr plane immediately follows the Y plane in memory. The CbCr
plane is the same width and height, in bytes, as the Y plane (and of the
image). Each CbCr pair belongs to two pixels. For example,
Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`.
``V4L2_PIX_FMT_NV61`` is the same except the Cb and Cr bytes are
swapped, the CrCb plane starts with a Cr byte.
If the Y plane has pad bytes after each row, then the CbCr plane has as
many pad bytes after its rows.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 0
:stub-columns: 0
* - start + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* - start + 16:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
* - start + 20:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
* - start + 24:
- Cb\ :sub:`20`
- Cr\ :sub:`20`
- Cb\ :sub:`21`
- Cr\ :sub:`21`
* - start + 28:
- Cb\ :sub:`30`
- Cr\ :sub:`30`
- Cb\ :sub:`31`
- Cr\ :sub:`31`
**Color Sample Location:**
Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
horizontally.

88
Documentation/userspace-api/media/v4l/pixfmt-nv16m.rst
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _V4L2-PIX-FMT-NV16M:
.. _v4l2-pix-fmt-nv61m:
********************************************************
V4L2_PIX_FMT_NV16M ('NM16'), V4L2_PIX_FMT_NV61M ('NM61')
********************************************************
V4L2_PIX_FMT_NV61M
Variation of ``V4L2_PIX_FMT_NV16`` and ``V4L2_PIX_FMT_NV61`` with planes
non contiguous in memory.
Description
===========
This is a multi-planar, two-plane version of the YUV 4:2:2 format. The
three components are separated into two sub-images or planes.
``V4L2_PIX_FMT_NV16M`` differs from ``V4L2_PIX_FMT_NV16`` in that the
two planes are non-contiguous in memory, i.e. the chroma plane does not
necessarily immediately follow the luma plane. The luminance data
occupies the first plane. The Y plane has one byte per pixel. In the
second plane there is chrominance data with alternating chroma samples.
The CbCr plane is the same width and height, in bytes, as the Y plane.
Each CbCr pair belongs to two pixels. For example,
Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`.
``V4L2_PIX_FMT_NV61M`` is the same as ``V4L2_PIX_FMT_NV16M`` except the
Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.
``V4L2_PIX_FMT_NV16M`` and ``V4L2_PIX_FMT_NV61M`` are intended to be
used only in drivers and applications that support the multi-planar API,
described in :ref:`planar-apis`.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 0
:stub-columns: 0
* - start0 + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start0 + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start0 + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start0 + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* -
* - start1 + 0:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`02`
- Cr\ :sub:`02`
* - start1 + 4:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`12`
- Cr\ :sub:`12`
* - start1 + 8:
- Cb\ :sub:`20`
- Cr\ :sub:`20`
- Cb\ :sub:`22`
- Cr\ :sub:`22`
* - start1 + 12:
- Cb\ :sub:`30`
- Cr\ :sub:`30`
- Cb\ :sub:`32`
- Cr\ :sub:`32`
**Color Sample Location:**
Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
horizontally.

95
Documentation/userspace-api/media/v4l/pixfmt-nv24.rst
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _V4L2-PIX-FMT-NV24:
.. _V4L2-PIX-FMT-NV42:
******************************************************
V4L2_PIX_FMT_NV24 ('NV24'), V4L2_PIX_FMT_NV42 ('NV42')
******************************************************
V4L2_PIX_FMT_NV42
Formats with full horizontal and vertical chroma resolutions, also known
as YUV 4:4:4. One luminance and one chrominance plane with alternating
chroma samples as opposed to ``V4L2_PIX_FMT_YVU420``
Description
===========
These are two-plane versions of the YUV 4:4:4 format. The three
components are separated into two sub-images or planes. The Y plane is
first, with each Y sample stored in one byte per pixel. For
``V4L2_PIX_FMT_NV24``, a combined CbCr plane immediately follows the Y
plane in memory. The CbCr plane has the same width and height, in
pixels, as the Y plane (and the image). Each line contains one CbCr pair
per pixel, with each Cb and Cr sample stored in one byte.
``V4L2_PIX_FMT_NV42`` is the same except that the Cb and Cr samples are
swapped, the CrCb plane starts with a Cr sample.
If the Y plane has pad bytes after each row, then the CbCr plane has
twice as many pad bytes after its rows.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 0
:stub-columns: 0
* - start + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* - start + 16:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
- Cb\ :sub:`02`
- Cr\ :sub:`02`
- Cb\ :sub:`03`
- Cr\ :sub:`03`
* - start + 24:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
- Cb\ :sub:`12`
- Cr\ :sub:`12`
- Cb\ :sub:`13`
- Cr\ :sub:`13`
* - start + 32:
- Cb\ :sub:`20`
- Cr\ :sub:`20`
- Cb\ :sub:`21`
- Cr\ :sub:`21`
- Cb\ :sub:`22`
- Cr\ :sub:`22`
- Cb\ :sub:`23`
- Cr\ :sub:`23`
* - start + 40:
- Cb\ :sub:`30`
- Cr\ :sub:`30`
- Cb\ :sub:`31`
- Cr\ :sub:`31`
- Cb\ :sub:`32`
- Cr\ :sub:`32`
- Cb\ :sub:`33`
- Cr\ :sub:`33`

463
Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst Normal file
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. planar-yuv:
******************
Planar YUV formats
******************
Planar formats split luma and chroma data in separate memory regions. They
exist in two variants:
- Semi-planar formats use two planes. The first plane is the luma plane and
stores the Y components. The second plane is the chroma plane and stores the
Cb and Cr components interleaved.
- Fully planar formats use three planes to store the Y, Cb and Cr components
separately.
Within a plane, components are stored in pixel order, which may be linear or
tiled. Padding may be supported at the end of the lines, and the line stride of
the chroma planes may be constrained by the line stride of the luma plane.
Some planar formats allow planes to be placed in independent memory locations.
They are identified by an 'M' suffix in their name (such as in
``V4L2_PIX_FMT_NV12M``). Those formats are intended to be used only in drivers
and applications that support the multi-planar API, described in
:ref:`planar-apis`. Unless explicitly documented as supporting non-contiguous
planes, formats require the planes to follow each other immediately in memory.
Semi-Planar YUV Formats
=======================
These formats are commonly referred to as NV formats (NV12, NV16, ...). They
use two planes, and store the luma components in the first plane and the chroma
components in the second plane. The Cb and Cr components are interleaved in the
chroma plane, with Cb and Cr always stored in pairs. The chroma order is
exposed as different formats.
For memory contiguous formats, the number of padding pixels at the end of the
chroma lines is identical to the padding of the luma lines. Without horizontal
subsampling, the chroma line stride (in bytes) is thus equal to twice the luma
line stride. With horizontal subsampling by 2, the chroma line stride is equal
to the luma line stride. Vertical subsampling doesn't affect the line stride.
For non-contiguous formats, no constraints are enforced by the format on the
relationship between the luma and chroma line padding and stride.
All components are stored with the same number of bits per component.
.. flat-table:: Overview of Semi-Planar YUV Formats
:header-rows: 1
:stub-columns: 0
* - Identifier
- Code
- Bits per component
- Subsampling
- Chroma order [1]_
- Contiguous [2]_
- Tiling [3]_
* - V4L2_PIX_FMT_NV12
- 'NV12'
- 8
- 4:2:0
- Cb, Cr
- Yes
- Linear
* - V4L2_PIX_FMT_NV21
- 'NV21'
- 8
- 4:2:0
- Cr, Cr
- Yes
- Linear
* - V4L2_PIX_FMT_NV12M
- 'NM12'
- 8
- 4:2:0
- Cb, Cr
- No
- Linear
* - V4L2_PIX_FMT_NV21M
- 'NM21'
- 8
- 4:2:0
- Cr, Cr
- No
- Linear
* - V4L2_PIX_FMT_NV12MT
- 'TM12'
- 8
- 4:2:0
- Cb, Cr
- No
- 64x32 macroblocks
Horizontal Z order
* - V4L2_PIX_FMT_NV12MT_16X16
- 'VM12'
- 8
- 4:2:2
- Cb, Cr
- No
- 16x16 macroblocks
* - V4L2_PIX_FMT_NV16
- 'NV16'
- 8
- 4:2:2
- Cb, Cr
- Yes
- Linear
* - V4L2_PIX_FMT_NV61
- 'NV61'
- 8
- 4:2:2
- Cr, Cr
- Yes
- Linear
* - V4L2_PIX_FMT_NV16M
- 'NM16'
- 8
- 4:2:2
- Cb, Cr
- No
- Linear
* - V4L2_PIX_FMT_NV61M
- 'NM61'
- 8
- 4:2:2
- Cr, Cr
- No
- Linear
* - V4L2_PIX_FMT_NV24
- 'NV24'
- 8
- 4:4:4
- Cb, Cr
- Yes
- Linear
* - V4L2_PIX_FMT_NV42
- 'NV42'
- 8
- 4:4:4
- Cr, Cr
- Yes
- Linear
.. note::
.. [1] Order of chroma samples in the second plane
.. [2] Indicates if planes have to be contiguous in memory or can be
disjoint
.. [3] Macroblock size in pixels
**Color Sample Location:**
Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
horizontally.
.. _V4L2-PIX-FMT-NV12:
.. _V4L2-PIX-FMT-NV21:
.. _V4L2-PIX-FMT-NV12M:
.. _V4L2-PIX-FMT-NV21M:
NV12, NV21, NV12M and NV21M
---------------------------
Semi-planar YUV 4:2:0 formats. The chroma plane is subsampled by 2 in each
direction. Chroma lines contain half the number of pixels and the same number
of bytes as luma lines, and the chroma plane contains half the number of lines
of the luma plane.
.. flat-table:: Sample 4x4 NV12 Image
:header-rows: 0
:stub-columns: 0
* - start + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* - start + 16:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
* - start + 20:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
.. flat-table:: Sample 4x4 NV12M Image
:header-rows: 0
:stub-columns: 0
* - start0 + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start0 + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start0 + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start0 + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* -
* - start1 + 0:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
* - start1 + 4:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
.. _V4L2-PIX-FMT-NV12MT:
.. _V4L2-PIX-FMT-NV12MT-16X16:
NV12MT and MV12MT_16X16
-----------------------
Semi-planar YUV 4:2:0 formats, using macroblock tiling. The chroma plane is
subsampled by 2 in each direction. Chroma lines contain half the number of
pixels and the same number of bytes as luma lines, and the chroma plane
contains half the number of lines of the luma plane.
``V4L2_PIX_FMT_NV12MT_16X16`` stores pixel in 2D 16x16 macroblocks, and stores
macroblocks linearly in memory. The line stride and image height must be
aligned to a multiple of 16. The layouts of the luma and chroma planes are
identical.
``V4L2_PIX_FMT_NV12MT`` stores pixels in 2D 64x32 macroblocks, and stores 2x2
groups of macroblocks in Z-order in memory, alternating Z and mirrored Z shapes
horizontally. The line stride must be a multiple of 128 pixels to ensure an
integer number of Z shapes. The image height must be a multiple of 32 pixels.
If the vertical resolution is an odd number of macroblocks, the last row of
macroblocks is stored in linear order. The layouts of the luma and chroma
planes are identical.
.. _nv12mt:
.. kernel-figure:: nv12mt.svg
:alt: nv12mt.svg
:align: center
V4L2_PIX_FMT_NV12MT macroblock Z shape memory layout
.. _nv12mt_ex:
.. kernel-figure:: nv12mt_example.svg
:alt: nv12mt_example.svg
:align: center
Example V4L2_PIX_FMT_NV12MT memory layout of macroblocks
.. _V4L2-PIX-FMT-NV16:
.. _V4L2-PIX-FMT-NV61:
.. _V4L2-PIX-FMT-NV16M:
.. _V4L2-PIX-FMT-NV61M:
NV16, NV61, NV16M and NV61M
---------------------------
Semi-planar YUV 4:2:2 formats. The chroma plane is subsampled by 2 in the
horizontal direction. Chroma lines contain half the number of pixels and the
same number of bytes as luma lines, and the chroma plane contains the same
number of lines as the luma plane.
.. flat-table:: Sample 4x4 NV16 Image
:header-rows: 0
:stub-columns: 0
* - start + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* - start + 16:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
* - start + 20:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
* - start + 24:
- Cb\ :sub:`20`
- Cr\ :sub:`20`
- Cb\ :sub:`21`
- Cr\ :sub:`21`
* - start + 28:
- Cb\ :sub:`30`
- Cr\ :sub:`30`
- Cb\ :sub:`31`
- Cr\ :sub:`31`
.. flat-table:: Sample 4x4 NV16M Image
:header-rows: 0
:stub-columns: 0
* - start0 + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start0 + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start0 + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start0 + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* -
* - start1 + 0:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`02`
- Cr\ :sub:`02`
* - start1 + 4:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`12`
- Cr\ :sub:`12`
* - start1 + 8:
- Cb\ :sub:`20`
- Cr\ :sub:`20`
- Cb\ :sub:`22`
- Cr\ :sub:`22`
* - start1 + 12:
- Cb\ :sub:`30`
- Cr\ :sub:`30`
- Cb\ :sub:`32`
- Cr\ :sub:`32`
.. _V4L2-PIX-FMT-NV24:
.. _V4L2-PIX-FMT-NV42:
NV24 and NV42
-------------
Semi-planar YUV 4:4:4 formats. The chroma plane is subsampled by 2 in the
horizontal direction. Chroma lines contain half the number of pixels and the
same number of bytes as luma lines, and the chroma plane contains the same
number of lines as the luma plane.
.. flat-table:: Sample 4x4 NV24 Image
:header-rows: 0
:stub-columns: 0
* - start + 0:
- Y'\ :sub:`00`
- Y'\ :sub:`01`
- Y'\ :sub:`02`
- Y'\ :sub:`03`
* - start + 4:
- Y'\ :sub:`10`
- Y'\ :sub:`11`
- Y'\ :sub:`12`
- Y'\ :sub:`13`
* - start + 8:
- Y'\ :sub:`20`
- Y'\ :sub:`21`
- Y'\ :sub:`22`
- Y'\ :sub:`23`
* - start + 12:
- Y'\ :sub:`30`
- Y'\ :sub:`31`
- Y'\ :sub:`32`
- Y'\ :sub:`33`
* - start + 16:
- Cb\ :sub:`00`
- Cr\ :sub:`00`
- Cb\ :sub:`01`
- Cr\ :sub:`01`
- Cb\ :sub:`02`
- Cr\ :sub:`02`
- Cb\ :sub:`03`
- Cr\ :sub:`03`
* - start + 24:
- Cb\ :sub:`10`
- Cr\ :sub:`10`
- Cb\ :sub:`11`
- Cr\ :sub:`11`
- Cb\ :sub:`12`
- Cr\ :sub:`12`
- Cb\ :sub:`13`
- Cr\ :sub:`13`
* - start + 32:
- Cb\ :sub:`20`
- Cr\ :sub:`20`
- Cb\ :sub:`21`
- Cr\ :sub:`21`
- Cb\ :sub:`22`
- Cr\ :sub:`22`
- Cb\ :sub:`23`
- Cr\ :sub:`23`
* - start + 40:
- Cb\ :sub:`30`
- Cr\ :sub:`30`
- Cb\ :sub:`31`
- Cr\ :sub:`31`
- Cb\ :sub:`32`
- Cr\ :sub:`32`
- Cb\ :sub:`33`
- Cr\ :sub:`33`

7
Documentation/userspace-api/media/v4l/yuv-formats.rst
Просмотреть файл

@ -265,6 +265,7 @@ image.
:maxdepth: 1
pixfmt-packed-yuv
pixfmt-yuv-planar
pixfmt-yuv-luma
pixfmt-y8i
pixfmt-y12i
@ -276,10 +277,4 @@ image.
pixfmt-yuv410
pixfmt-yuv422p
pixfmt-yuv411p
pixfmt-nv12
pixfmt-nv12m
pixfmt-nv12mt
pixfmt-nv16
pixfmt-nv16m
pixfmt-nv24
pixfmt-m420