149 lines
3.1 KiB
ReStructuredText
149 lines
3.1 KiB
ReStructuredText
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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. _yuv-luma-only:
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*****************
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Luma-Only Formats
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*****************
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This family of formats only store the luma component of a Y'CbCr image. They
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are often referred to as greyscale formats.
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.. note::
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- In all the tables that follow, bit 7 is the most significant bit in a byte.
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- Formats are described with the minimum number of pixels needed to create a
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byte-aligned repeating pattern. `...` indicates repetition of the pattern.
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- Y'\ :sub:`x`\ [9:2] denotes bits 9 to 2 of the Y' value for pixel at column
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`x`.
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- `0` denotes padding bits set to 0.
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.. raw:: latex
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\scriptsize
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.. tabularcolumns:: |p{3.6cm}|p{3.0cm}|p{1.3cm}|p{2.6cm}|p{1.3cm}|p{1.3cm}|p{1.3cm}|
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.. flat-table:: Luma-Only Image Formats
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:header-rows: 1
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:stub-columns: 0
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* - Identifier
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- Code
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- Byte 0
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- Byte 1
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- Byte 2
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- Byte 3
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- Byte 4
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* .. _V4L2-PIX-FMT-GREY:
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- ``V4L2_PIX_FMT_GREY``
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- 'GREY'
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- Y'\ :sub:`0`\ [7:0]
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- ...
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- ...
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- ...
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- ...
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* .. _V4L2-PIX-FMT-IPU3-Y10:
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- ``V4L2_PIX_FMT_IPU3_Y10``
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- 'ip3y'
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- Y'\ :sub:`0`\ [7:0]
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- Y'\ :sub:`1`\ [5:0] Y'\ :sub:`0`\ [9:8]
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- Y'\ :sub:`2`\ [3:0] Y'\ :sub:`1`\ [9:6]
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- Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [9:4]
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- Y'\ :sub:`3`\ [9:2]
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* .. _V4L2-PIX-FMT-Y10:
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- ``V4L2_PIX_FMT_Y10``
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- 'Y10 '
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- Y'\ :sub:`0`\ [7:0]
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- `000000` Y'\ :sub:`0`\ [9:8]
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- ...
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- ...
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- ...
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* .. _V4L2-PIX-FMT-Y10BPACK:
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- ``V4L2_PIX_FMT_Y10BPACK``
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- 'Y10B'
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- Y'\ :sub:`0`\ [9:2]
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- Y'\ :sub:`0`\ [1:0] Y'\ :sub:`1`\ [9:4]
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- Y'\ :sub:`1`\ [3:0] Y'\ :sub:`2`\ [9:6]
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- Y'\ :sub:`2`\ [5:0] Y'\ :sub:`3`\ [9:8]
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- Y'\ :sub:`3`\ [7:0]
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* .. _V4L2-PIX-FMT-Y10P:
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- ``V4L2_PIX_FMT_Y10P``
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- 'Y10P'
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- Y'\ :sub:`0`\ [9:2]
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- Y'\ :sub:`1`\ [9:2]
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- Y'\ :sub:`2`\ [9:2]
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- Y'\ :sub:`3`\ [9:2]
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- Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [1:0] Y'\ :sub:`1`\ [1:0] Y'\ :sub:`0`\ [1:0]
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* .. _V4L2-PIX-FMT-Y12:
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- ``V4L2_PIX_FMT_Y12``
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- 'Y12 '
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- Y'\ :sub:`0`\ [7:0]
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- `0000` Y'\ :sub:`0`\ [11:8]
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- ...
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- ...
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- ...
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* .. _V4L2-PIX-FMT-Y14:
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- ``V4L2_PIX_FMT_Y14``
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- 'Y14 '
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- Y'\ :sub:`0`\ [7:0]
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- `00` Y'\ :sub:`0`\ [13:8]
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- ...
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- ...
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- ...
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* .. _V4L2-PIX-FMT-Y16:
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- ``V4L2_PIX_FMT_Y16``
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- 'Y16 '
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- Y'\ :sub:`0`\ [7:0]
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- Y'\ :sub:`0`\ [15:8]
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- ...
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- ...
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- ...
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* .. _V4L2-PIX-FMT-Y16-BE:
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- ``V4L2_PIX_FMT_Y16_BE``
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- 'Y16 ' | (1U << 31)
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- Y'\ :sub:`0`\ [15:8]
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- Y'\ :sub:`0`\ [7:0]
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- ...
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- ...
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- ...
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.. raw:: latex
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\normalsize
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.. note::
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For the Y16 and Y16_BE formats, the actual sampling precision may be lower
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than 16 bits. For example, 10 bits per pixel uses values in the range 0 to
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1023. For the IPU3_Y10 format 25 pixels are packed into 32 bytes, which
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leaves the 6 most significant bits of the last byte padded with 0.
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