Merge remote-tracking branch 'iommu/next'

[deliverable/linux.git] / Documentation / media / uapi / v4l / pixfmt-nv16.rst

.. -*- coding: utf-8; mode: rst -*-

.. _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

    -  .. row 1

       -  start + 0:

       -  Y'\ :sub:`00`

       -  Y'\ :sub:`01`

       -  Y'\ :sub:`02`

       -  Y'\ :sub:`03`

    -  .. row 2

       -  start + 4:

       -  Y'\ :sub:`10`

       -  Y'\ :sub:`11`

       -  Y'\ :sub:`12`

       -  Y'\ :sub:`13`

    -  .. row 3

       -  start + 8:

       -  Y'\ :sub:`20`

       -  Y'\ :sub:`21`

       -  Y'\ :sub:`22`

       -  Y'\ :sub:`23`

    -  .. row 4

       -  start + 12:

       -  Y'\ :sub:`30`

       -  Y'\ :sub:`31`

       -  Y'\ :sub:`32`

       -  Y'\ :sub:`33`

    -  .. row 5

       -  start + 16:

       -  Cb\ :sub:`00`

       -  Cr\ :sub:`00`

       -  Cb\ :sub:`01`

       -  Cr\ :sub:`01`

    -  .. row 6

       -  start + 20:

       -  Cb\ :sub:`10`

       -  Cr\ :sub:`10`

       -  Cb\ :sub:`11`

       -  Cr\ :sub:`11`

    -  .. row 7

       -  start + 24:

       -  Cb\ :sub:`20`

       -  Cr\ :sub:`20`

       -  Cb\ :sub:`21`

       -  Cr\ :sub:`21`

    -  .. row 8

       -  start + 28:

       -  Cb\ :sub:`30`

       -  Cr\ :sub:`30`

       -  Cb\ :sub:`31`

       -  Cr\ :sub:`31`


**Color Sample Location..**



.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -
       -  0

       -
       -  1

       -  2

       -
       -  3

    -  .. row 2

       -  0

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y

    -  .. row 3

       -
       -
       -  C

       -
       -
       -  C

       -

    -  .. row 4

       -  1

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y

    -  .. row 5

       -
       -
       -  C

       -
       -
       -  C

       -

    -  .. row 6

       -

    -  .. row 7

       -  2

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y

    -  .. row 8

       -
       -
       -  C

       -
       -
       -  C

       -

    -  .. row 9

       -  3

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y

    -  .. row 10

       -
       -
       -  C

       -
       -
       -  C

       -