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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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-DabMod 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-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#include "DifferentialModulator.h"
#include "PcDebug.h"
#include <stdio.h>
#include <stdexcept>
#include <complex>
#include <string.h>
typedef std::complex<float> complexf;
DifferentialModulator::DifferentialModulator(size_t carriers) :
ModMux(),
d_carriers(carriers)
{
PDEBUG("DifferentialModulator::DifferentialModulator(%zu)\n", carriers);
}
DifferentialModulator::~DifferentialModulator()
{
PDEBUG("DifferentialModulator::~DifferentialModulator()\n");
}
// dataIn[0] -> phase reference
// dataIn[1] -> data symbols
int DifferentialModulator::process(std::vector<Buffer*> dataIn, Buffer* dataOut)
{
#ifdef TRACE
fprintf(stderr, "DifferentialModulator::process (dataIn:");
for (size_t i = 0; i < dataIn.size(); ++i) {
fprintf(stderr, " %p", dataIn[i]);
}
fprintf(stderr, ", sizeIn: ");
for (size_t i = 0; i < dataIn.size(); ++i) {
fprintf(stderr, " %zu", dataIn[i]->getLength());
}
fprintf(stderr, ", dataOut: %p, sizeOut: %zu)\n", dataOut, dataOut->getLength());
#endif
if (dataIn.size() != 2) {
throw std::runtime_error(
"DifferentialModulator::process nb of input streams not 2!");
}
size_t phaseSize = dataIn[0]->getLength() / sizeof(complexf);
size_t dataSize = dataIn[1]->getLength() / sizeof(complexf);
dataOut->setLength((phaseSize + dataSize) * sizeof(complexf));
const complexf* phase = reinterpret_cast<const complexf*>(dataIn[0]->getData());
const complexf* in = reinterpret_cast<const complexf*>(dataIn[1]->getData());
complexf* out = reinterpret_cast<complexf*>(dataOut->getData());
if (phaseSize != d_carriers) {
throw std::runtime_error(
"DifferentialModulator::process input phase size not valid!");
}
if (dataSize % d_carriers != 0) {
throw std::runtime_error(
"DifferentialModulator::process input data size not valid!");
}
memcpy(dataOut->getData(), phase, phaseSize * sizeof(complexf));
for (size_t i = 0; i < dataSize; i += d_carriers) {
for (size_t j = 0; j < d_carriers; j += 4) {
out[d_carriers + j] = out[j] * in[j];
out[d_carriers + j + 1] = out[j + 1] * in[j + 1];
out[d_carriers + j + 2] = out[j + 2] * in[j + 2];
out[d_carriers + j + 3] = out[j + 3] * in[j + 3];
}
in += d_carriers;
out += d_carriers;
}
return dataOut->getLength();
}
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