Luma-Only Formats - Wsl2 Linux Kernel

.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later

.. _yuv-luma-only:

Luma-Only Formats

This family of formats only store the luma component of a Y'CbCr image. They are often referred to as greyscale formats.

.. note::

In all the tables that follow, bit 7 is the most significant bit in a byte.
Formats are described with the minimum number of pixels needed to create a byte-aligned repeating pattern. ... indicates repetition of the pattern.
Y'\ :sub:x\ [9:2] denotes bits 9 to 2 of the Y' value for pixel at column x.
0 denotes padding bits set to 0.

.. raw:: latex

\scriptsize

.. tabularcolumns:: |p{3.6cm}|p{3.0cm}|p{1.3cm}|p{2.6cm}|p{1.3cm}|p{1.3cm}|p{1.3cm}|

.. flat-table:: Luma-Only Image Formats :header-rows: 1 :stub-columns: 0

* - Identifier
  - Code
  - Byte 0
  - Byte 1
  - Byte 2
  - Byte 3
  - Byte 4

* .. _V4L2-PIX-FMT-GREY:

  - ``V4L2_PIX_FMT_GREY``
  - 'GREY'

  - Y'\ :sub:`0`\ [7:0]
  - ...
  - ...
  - ...
  - ...

* .. _V4L2-PIX-FMT-IPU3-Y10:

  - ``V4L2_PIX_FMT_IPU3_Y10``
  - 'ip3y'

  - Y'\ :sub:`0`\ [7:0]
  - Y'\ :sub:`1`\ [5:0] Y'\ :sub:`0`\ [9:8]
  - Y'\ :sub:`2`\ [3:0] Y'\ :sub:`1`\ [9:6]
  - Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [9:4]
  - Y'\ :sub:`3`\ [9:2]

* .. _V4L2-PIX-FMT-Y10:

  - ``V4L2_PIX_FMT_Y10``
  - 'Y10 '

  - Y'\ :sub:`0`\ [7:0]
  - `000000` Y'\ :sub:`0`\ [9:8]
  - ...
  - ...
  - ...

* .. _V4L2-PIX-FMT-Y10BPACK:

  - ``V4L2_PIX_FMT_Y10BPACK``
  - 'Y10B'

  - Y'\ :sub:`0`\ [9:2]
  - Y'\ :sub:`0`\ [1:0] Y'\ :sub:`1`\ [9:4]
  - Y'\ :sub:`1`\ [3:0] Y'\ :sub:`2`\ [9:6]
  - Y'\ :sub:`2`\ [5:0] Y'\ :sub:`3`\ [9:8]
  - Y'\ :sub:`3`\ [7:0]

* .. _V4L2-PIX-FMT-Y10P:

  - ``V4L2_PIX_FMT_Y10P``
  - 'Y10P'

  - Y'\ :sub:`0`\ [9:2]
  - Y'\ :sub:`1`\ [9:2]
  - Y'\ :sub:`2`\ [9:2]
  - Y'\ :sub:`3`\ [9:2]
  - Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [1:0] Y'\ :sub:`1`\ [1:0] Y'\ :sub:`0`\ [1:0]

* .. _V4L2-PIX-FMT-Y12:

  - ``V4L2_PIX_FMT_Y12``
  - 'Y12 '

  - Y'\ :sub:`0`\ [7:0]
  - `0000` Y'\ :sub:`0`\ [11:8]
  - ...
  - ...
  - ...

* .. _V4L2-PIX-FMT-Y012:

  - ``V4L2_PIX_FMT_Y012``
  - 'Y012'

  - Y'\ :sub:`0`\ [3:0] `0000`
  - Y'\ :sub:`0`\ [11:4]
  - ...
  - ...
  - ...

* .. _V4L2-PIX-FMT-Y14:

  - ``V4L2_PIX_FMT_Y14``
  - 'Y14 '

  - Y'\ :sub:`0`\ [7:0]
  - `00` Y'\ :sub:`0`\ [13:8]
  - ...
  - ...
  - ...

* .. _V4L2-PIX-FMT-Y16:

  - ``V4L2_PIX_FMT_Y16``
  - 'Y16 '

  - Y'\ :sub:`0`\ [7:0]
  - Y'\ :sub:`0`\ [15:8]
  - ...
  - ...
  - ...

* .. _V4L2-PIX-FMT-Y16-BE:

  - ``V4L2_PIX_FMT_Y16_BE``
  - 'Y16 ' | (1U << 31)

  - Y'\ :sub:`0`\ [15:8]
  - Y'\ :sub:`0`\ [7:0]
  - ...
  - ...
  - ...

.. raw:: latex

\normalsize

.. note::

For the Y16 and Y16_BE formats, the actual sampling precision may be lower
than 16 bits. For example, 10 bits per pixel uses values in the range 0 to
1023. For the IPU3_Y10 format 25 pixels are packed into 32 bytes, which
leaves the 6 most significant bits of the last byte padded with 0.

For Y012 and Y12 formats, Y012 places its data in the 12 high bits, with
padding zeros in the 4 low bits, in contrast to the Y12 format, which has
its padding located in the most significant bits of the 16 bit word.