blob: 267866896d907e21fac6016a1816da5e629c6b41 (
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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
Research Center Canada)
Copyright (C) 2016
Matthias P. Braendli, matthias.braendli@mpb.li
http://www.opendigitalradio.org
Pseudo-Random Bit Sequence generator for test purposes.
*/
/*
This file is part of ODR-DabMux.
ODR-DabMux is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
ODR-DabMux is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dabInputPrbs.h"
#include <stdexcept>
#include <sstream>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include <errno.h>
#include "utils.h"
using namespace std;
// ETS 300 799 Clause G.2.1
// Preferred polynomial is G(x) = x^20 + x^17 + 1
const uint32_t PRBS_DEFAULT_POLY = (1 << 19) | (1 << 16) | 1;
int DabInputPrbs::open(const string& name)
{
if (name.empty()) {
m_prbs.setup(PRBS_DEFAULT_POLY);
}
else {
if (name[0] != ':') {
throw invalid_argument(
"Invalid PRBS address format. "
"Must be prbs://:polynomial.");
}
const string poly_str = name.substr(1);
long polynomial = hexparse(poly_str);
if (polynomial == 0) {
throw invalid_argument("No polynomial given for PRBS input");
}
m_prbs.setup(polynomial);
}
rewind();
return 0;
}
int DabInputPrbs::readFrame(void* buffer, int size)
{
unsigned char* cbuffer = reinterpret_cast<unsigned char*>(buffer);
for (int i = 0; i < size; ++i) {
cbuffer[i] = m_prbs.step();
}
return size;
}
int DabInputPrbs::setBitrate(int bitrate)
{
return bitrate;
}
int DabInputPrbs::close()
{
return 0;
}
int DabInputPrbs::rewind()
{
m_prbs.rewind();
return 0;
}
|
