1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2
3.. _V4L2-SDR-FMT-PCU18BE:
4
5******************************
6V4L2_SDR_FMT_PCU18BE ('PC18')
7******************************
8
9Planar complex unsigned 18-bit big endian IQ sample
10
11Description
12===========
13
14This format contains a sequence of complex number samples. Each complex
15number consist of two parts called In-phase and Quadrature (IQ). Both I
16and Q are represented as a 18 bit unsigned big endian number stored in
1732 bit space. The remaining unused bits within the 32 bit space will be
18padded with 0. I value starts first and Q value starts at an offset
19equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
20the 18 bits, bit 17:2 (16 bit) is data and bit 1:0 (2 bit) can be any
21value.
22
23**Byte Order.**
24Each cell is one byte.
25
26.. flat-table::
27    :header-rows:  1
28    :stub-columns: 0
29
30    * -  Offset:
31      -  Byte B0
32      -  Byte B1
33      -  Byte B2
34      -  Byte B3
35    * -  start + 0:
36      -  I'\ :sub:`0[17:10]`
37      -  I'\ :sub:`0[9:2]`
38      -  I'\ :sub:`0[1:0]; B2[5:0]=pad`
39      -  pad
40    * -  start + 4:
41      -  I'\ :sub:`1[17:10]`
42      -  I'\ :sub:`1[9:2]`
43      -  I'\ :sub:`1[1:0]; B2[5:0]=pad`
44      -  pad
45    * -  ...
46    * - start + offset:
47      -  Q'\ :sub:`0[17:10]`
48      -  Q'\ :sub:`0[9:2]`
49      -  Q'\ :sub:`0[1:0]; B2[5:0]=pad`
50      -  pad
51    * - start + offset + 4:
52      -  Q'\ :sub:`1[17:10]`
53      -  Q'\ :sub:`1[9:2]`
54      -  Q'\ :sub:`1[1:0]; B2[5:0]=pad`
55      -  pad
56