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/*
Copyright (C) 2005, 2206, 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 "GuardIntervalInserter.h"
#include "PcDebug.h"
#include <string.h>
#include <stdexcept>
#include <complex>
typedef std::complex<float> complexf;
GuardIntervalInserter::GuardIntervalInserter(size_t nbSymbols,
size_t spacing,
size_t nullSize,
size_t symSize) :
ModCodec(),
d_nbSymbols(nbSymbols),
d_spacing(spacing),
d_nullSize(nullSize),
d_symSize(symSize)
{
PDEBUG("GuardIntervalInserter::GuardIntervalInserter(%zu, %zu, %zu, %zu)"
" @ %p\n", nbSymbols, spacing, nullSize, symSize, this);
}
int GuardIntervalInserter::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("GuardIntervalInserter::process(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
dataOut->setLength((d_nullSize + (d_nbSymbols * d_symSize))
* sizeof(complexf));
const complexf* in = reinterpret_cast<const complexf*>(dataIn->getData());
complexf* out = reinterpret_cast<complexf*>(dataOut->getData());
size_t sizeIn = dataIn->getLength() / sizeof(complexf);
if (sizeIn != (d_nbSymbols + (d_nullSize ? 1 : 0)) * d_spacing) {
PDEBUG("Nb symbols: %zu\n", d_nbSymbols);
PDEBUG("Spacing: %zu\n", d_spacing);
PDEBUG("Null size: %zu\n", d_nullSize);
PDEBUG("Sym size: %zu\n", d_symSize);
PDEBUG("\n%zu != %zu\n", sizeIn, (d_nbSymbols + 1) * d_spacing);
throw std::runtime_error(
"GuardIntervalInserter::process input size not valid!");
}
// Handle Null symbol separately because it is longer
if (d_nullSize) {
// end - (nullSize - spacing) = 2 * spacing - nullSize
memcpy(out, &in[2 * d_spacing - d_nullSize],
(d_nullSize - d_spacing) * sizeof(complexf));
memcpy(&out[d_nullSize - d_spacing], in, d_spacing * sizeof(complexf));
in += d_spacing;
out += d_nullSize;
}
// Data symbols
for (size_t i = 0; i < d_nbSymbols; ++i) {
// end - (symSize - spacing) = 2 * spacing - symSize
memcpy(out, &in[2 * d_spacing - d_symSize],
(d_symSize - d_spacing) * sizeof(complexf));
memcpy(&out[d_symSize - d_spacing], in, d_spacing * sizeof(complexf));
in += d_spacing;
out += d_symSize;
}
return sizeIn;
}
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