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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 "dabInputPrbs.h"
#include <stdexcept>
#include <sstream>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include <errno.h>
using namespace std;
int DabInputPrbs::open(const string name)
{
if (name[0] != ':') {
throw invalid_argument(
"Invalid PRBS address format. Must be prbs://:polynomial.");
}
const string poly_str = name.substr(1);
long polynomial = strtol(poly_str.c_str(), (char **)NULL, 10);
if ((polynomial == LONG_MIN) || (polynomial == LONG_MAX)) {
stringstream ss;
ss << "Can't convert polynomial number " << poly_str;
throw invalid_argument(ss.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;
}
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