Documentation/userspace-api/media/v4l/pixfmt-sdr-pcu20be.rst

Source file repositories/reference/linux-study-clean/Documentation/userspace-api/media/v4l/pixfmt-sdr-pcu20be.rst

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Linux kernel
Corpus path
Documentation/userspace-api/media/v4l/pixfmt-sdr-pcu20be.rst
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.rst
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1513 bytes
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57
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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Annotated Snippet

.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: V4L

.. _V4L2-SDR-FMT-PCU20BE:

******************************
V4L2_SDR_FMT_PCU20BE ('PC20')
******************************

Planar complex unsigned 20-bit big endian IQ sample

Description
===========

This format contains a sequence of complex number samples. Each complex
number consist of two parts called In-phase and Quadrature (IQ). Both I
and Q are represented as a 20 bit unsigned big endian number stored in
32 bit space. The remaining unused bits within the 32 bit space will be
padded with 0. I value starts first and Q value starts at an offset
equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
the 20 bits, bit 19:2 (18 bit) is data and bit 1:0 (2 bit) can be any
value.

**Byte Order.**
Each cell is one byte.

.. flat-table::
    :header-rows:  1
    :stub-columns: 0

    * -  Offset:
      -  Byte B0
      -  Byte B1
      -  Byte B2
      -  Byte B3
    * -  start + 0:
      -  I'\ :sub:`0[19:12]`
      -  I'\ :sub:`0[11:4]`
      -  I'\ :sub:`0[3:0]; B2[3:0]=pad`
      -  pad
    * -  start + 4:
      -  I'\ :sub:`1[19:12]`
      -  I'\ :sub:`1[11:4]`
      -  I'\ :sub:`1[3:0]; B2[3:0]=pad`
      -  pad
    * -  ...
    * - start + offset:
      -  Q'\ :sub:`0[19:12]`
      -  Q'\ :sub:`0[11:4]`
      -  Q'\ :sub:`0[3:0]; B2[3:0]=pad`
      -  pad
    * - start + offset + 4:
      -  Q'\ :sub:`1[19:12]`
      -  Q'\ :sub:`1[11:4]`
      -  Q'\ :sub:`1[3:0]; B2[3:0]=pad`
      -  pad

Annotation

Implementation Notes