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

.. _V4L2-SDR-FMT-PCU18BE:

V4L2_SDR_FMT_PCU18BE ('PC18')

Planar complex unsigned 18-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 18 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 18 bits, bit 17:2 (16 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[17:10]`
  -  I'\ :sub:`0[9:2]`
  -  I'\ :sub:`0[1:0]; B2[5:0]=pad`
  -  pad
* -  start + 4:
  -  I'\ :sub:`1[17:10]`
  -  I'\ :sub:`1[9:2]`
  -  I'\ :sub:`1[1:0]; B2[5:0]=pad`
  -  pad
* -  ...
* - start + offset:
  -  Q'\ :sub:`0[17:10]`
  -  Q'\ :sub:`0[9:2]`
  -  Q'\ :sub:`0[1:0]; B2[5:0]=pad`
  -  pad
* - start + offset + 4:
  -  Q'\ :sub:`1[17:10]`
  -  Q'\ :sub:`1[9:2]`
  -  Q'\ :sub:`1[1:0]; B2[5:0]=pad`
  -  pad