blob: 5499eed39477412e8531d567df5a033fbcae0545 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
.. -*- coding: utf-8; mode: rst -*-
.. _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
|
