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/*
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 "input/Prbs.h"
#include <stdexcept>
#include <sstream>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include <errno.h>
#include "utils.h"
using namespace std;
namespace Inputs {
// ETS 300 799 Clause G.2.1
// Preferred polynomial is G(x) = x^20 + x^17 + 1
const uint32_t PRBS_DEFAULT_POLY = (1 << 20) | (1 << 17) | (1 << 0);
void Prbs::open(const string& name)
{
if (name.substr(0, 7) != "prbs://") {
throw logic_error("Invalid PRBS name");
}
const string& url_polynomial = name.substr(7);
if (url_polynomial.empty()) {
m_prbs.setup(PRBS_DEFAULT_POLY);
}
else {
if (url_polynomial[0] != ':') {
throw invalid_argument(
"Invalid PRBS address format. "
"Must be prbs://:polynomial.");
}
const string poly_str = url_polynomial.substr(1);
long polynomial = hexparse(poly_str);
if (polynomial == 0) {
throw invalid_argument("No polynomial given for PRBS input");
}
m_prbs.setup(polynomial);
}
rewind();
}
int Prbs::readFrame(uint8_t* buffer, size_t size)
{
for (size_t i = 0; i < size; ++i) {
buffer[i] = m_prbs.step();
}
return size;
}
int Prbs::setBitrate(int bitrate)
{
if (bitrate <= 0) {
throw invalid_argument("Invalid bitrate " + to_string(bitrate));
}
return bitrate;
}
void Prbs::close()
{
}
int Prbs::rewind()
{
m_prbs.rewind();
return 0;
}
};
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