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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 "TimeInterleaver.h"
#include "PcDebug.h"
#include <vector>
#include <stdint.h>
TimeInterleaver::TimeInterleaver(size_t framesize)
throw (std::invalid_argument) :
ModCodec(),
d_framesize(framesize)
{
PDEBUG("TimeInterleaver::TimeInterleaver(%zu) @ %p\n", framesize, this);
if (framesize & 1) {
throw std::invalid_argument("framesize must be 16 bits multiple");
}
for (int i = 0; i < 16; ++i) {
d_history.emplace_back(framesize, 0);
}
}
TimeInterleaver::~TimeInterleaver()
{
PDEBUG("TimeInterleaver::~TimeInterleaver() @ %p\n", this);
}
int TimeInterleaver::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("TimeInterleaver::process(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
if (dataIn->getLength() != d_framesize) {
throw std::invalid_argument("Interleaver buffer input size " +
std::to_string(dataIn->getLength()) + " expected " +
std::to_string(d_framesize));
}
dataOut->setLength(dataIn->getLength());
const unsigned char* in = reinterpret_cast<const unsigned char*>(dataIn->getData());
unsigned char* out = reinterpret_cast<unsigned char*>(dataOut->getData());
for (size_t i = 0; i < dataOut->getLength();) {
d_history.push_front(d_history.back());
d_history.pop_back();
for (uint_fast16_t j = 0; j < d_framesize;) {
d_history[0][j] = in[i];
out[i] = d_history[0] [j] & 0x80;
out[i] |= d_history[8] [j] & 0x40;
out[i] |= d_history[4] [j] & 0x20;
out[i] |= d_history[12][j] & 0x10;
out[i] |= d_history[2] [j] & 0x08;
out[i] |= d_history[10][j] & 0x04;
out[i] |= d_history[6] [j] & 0x02;
out[i] |= d_history[14][j] & 0x01;
++i;
++j;
d_history[0][j] = in[i];
out[i] = d_history[1] [j] & 0x80;
out[i] |= d_history[9] [j] & 0x40;
out[i] |= d_history[5] [j] & 0x20;
out[i] |= d_history[13][j] & 0x10;
out[i] |= d_history[3] [j] & 0x08;
out[i] |= d_history[11][j] & 0x04;
out[i] |= d_history[7] [j] & 0x02;
out[i] |= d_history[15][j] & 0x01;
++i;
++j;
}
}
return dataOut->getLength();
}
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