cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pixfmt-yuv-luma.rst (3179B)

      1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
      2
      3.. _yuv-luma-only:
      4
      5*****************
      6Luma-Only Formats
      7*****************
      8
      9This family of formats only store the luma component of a Y'CbCr image. They
     10are often referred to as greyscale formats.
     11
     12.. note::
     13
     14   - In all the tables that follow, bit 7 is the most significant bit in a byte.
     15   - Formats are described with the minimum number of pixels needed to create a
     16     byte-aligned repeating pattern. `...` indicates repetition of the pattern.
     17   - Y'\ :sub:`x`\ [9:2] denotes bits 9 to 2 of the Y' value for pixel at colum
     18     `x`.
     19   - `0` denotes padding bits set to 0.
     20
     21
     22.. raw:: latex
     23
     24    \scriptsize
     25
     26.. tabularcolumns:: |p{3.6cm}|p{3.0cm}|p{1.3cm}|p{2.6cm}|p{1.3cm}|p{1.3cm}|p{1.3cm}|
     27
     28.. flat-table:: Luma-Only Image Formats
     29    :header-rows: 1
     30    :stub-columns: 0
     31
     32    * - Identifier
     33      - Code
     34      - Byte 0
     35      - Byte 1
     36      - Byte 2
     37      - Byte 3
     38      - Byte 4
     39
     40    * .. _V4L2-PIX-FMT-GREY:
     41
     42      - ``V4L2_PIX_FMT_GREY``
     43      - 'GREY'
     44
     45      - Y'\ :sub:`0`\ [7:0]
     46      - ...
     47      - ...
     48      - ...
     49      - ...
     50
     51    * .. _V4L2-PIX-FMT-IPU3-Y10:
     52
     53      - ``V4L2_PIX_FMT_IPU3_Y10``
     54      - 'ip3y'
     55
     56      - Y'\ :sub:`0`\ [7:0]
     57      - Y'\ :sub:`1`\ [5:0] Y'\ :sub:`0`\ [9:8]
     58      - Y'\ :sub:`2`\ [3:0] Y'\ :sub:`1`\ [9:6]
     59      - Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [9:4]
     60      - Y'\ :sub:`3`\ [9:2]
     61
     62    * .. _V4L2-PIX-FMT-Y10:
     63
     64      - ``V4L2_PIX_FMT_Y10``
     65      - 'Y10 '
     66
     67      - Y'\ :sub:`0`\ [7:0]
     68      - `000000` Y'\ :sub:`0`\ [9:8]
     69      - ...
     70      - ...
     71      - ...
     72
     73    * .. _V4L2-PIX-FMT-Y10BPACK:
     74
     75      - ``V4L2_PIX_FMT_Y10BPACK``
     76      - 'Y10B'
     77
     78      - Y'\ :sub:`0`\ [9:2]
     79      - Y'\ :sub:`0`\ [1:0] Y'\ :sub:`1`\ [9:4]
     80      - Y'\ :sub:`1`\ [3:0] Y'\ :sub:`2`\ [9:6]
     81      - Y'\ :sub:`2`\ [5:0] Y'\ :sub:`3`\ [9:8]
     82      - Y'\ :sub:`3`\ [7:0]
     83
     84    * .. _V4L2-PIX-FMT-Y10P:
     85
     86      - ``V4L2_PIX_FMT_Y10P``
     87      - 'Y10P'
     88
     89      - Y'\ :sub:`0`\ [9:2]
     90      - Y'\ :sub:`1`\ [9:2]
     91      - Y'\ :sub:`2`\ [9:2]
     92      - Y'\ :sub:`3`\ [9:2]
     93      - Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [1:0] Y'\ :sub:`1`\ [1:0] Y'\ :sub:`0`\ [1:0]
     94
     95    * .. _V4L2-PIX-FMT-Y12:
     96
     97      - ``V4L2_PIX_FMT_Y12``
     98      - 'Y12 '
     99
    100      - Y'\ :sub:`0`\ [7:0]
    101      - `0000` Y'\ :sub:`0`\ [11:8]
    102      - ...
    103      - ...
    104      - ...
    105
    106    * .. _V4L2-PIX-FMT-Y14:
    107
    108      - ``V4L2_PIX_FMT_Y14``
    109      - 'Y14 '
    110
    111      - Y'\ :sub:`0`\ [7:0]
    112      - `00` Y'\ :sub:`0`\ [13:8]
    113      - ...
    114      - ...
    115      - ...
    116
    117    * .. _V4L2-PIX-FMT-Y16:
    118
    119      - ``V4L2_PIX_FMT_Y16``
    120      - 'Y16 '
    121
    122      - Y'\ :sub:`0`\ [7:0]
    123      - Y'\ :sub:`0`\ [15:8]
    124      - ...
    125      - ...
    126      - ...
    127
    128    * .. _V4L2-PIX-FMT-Y16-BE:
    129
    130      - ``V4L2_PIX_FMT_Y16_BE``
    131      - 'Y16 ' | (1U << 31)
    132
    133      - Y'\ :sub:`0`\ [15:8]
    134      - Y'\ :sub:`0`\ [7:0]
    135      - ...
    136      - ...
    137      - ...
    138
    139.. raw:: latex
    140
    141    \normalsize
    142
    143.. note::
    144
    145    For the Y16 and Y16_BE formats, the actual sampling precision may be lower
    146    than 16 bits. For example, 10 bits per pixel uses values in the range 0 to
    147    1023. For the IPU3_Y10 format 25 pixels are packed into 32 bytes, which
    148    leaves the 6 most significant bits of the last byte padded with 0.