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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 "QpskSymbolMapper.h"
#include "PcDebug.h"
#include <stdio.h>
#include <string.h>
#include <stdexcept>
#include <complex>
#include <math.h>
#ifdef __SSE__
# include <xmmintrin.h>
#endif // __SSE__
typedef std::complex<float> complexf;
QpskSymbolMapper::QpskSymbolMapper(size_t carriers) :
ModCodec(ModFormat(carriers / 4), ModFormat(carriers * 8)),
d_carriers(carriers)
{
PDEBUG("QpskSymbolMapper::QpskSymbolMapper(%zu) @ %p\n", carriers, this);
}
QpskSymbolMapper::~QpskSymbolMapper()
{
PDEBUG("QpskSymbolMapper::~QpskSymbolMapper() @ %p\n", this);
}
int QpskSymbolMapper::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("QpskSymbolMapper::process"
"(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
dataOut->setLength(dataIn->getLength() * 4 * 2 * sizeof(float)); // 4 output complex symbols per input byte
#ifdef __SSE__
const unsigned char* in = reinterpret_cast<const unsigned char*>(dataIn->getData());
__m128* out = reinterpret_cast<__m128*>(dataOut->getData());
if (dataIn->getLength() % (d_carriers / 4) != 0) {
fprintf(stderr, "%zu (input size) %% (%zu (carriers) / 4) != 0\n",
dataIn->getLength(), d_carriers);
throw std::runtime_error(
"QpskSymbolMapper::process input size not valid!");
}
const static __m128 symbols[16] = {
_mm_setr_ps( M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps( M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2),
_mm_setr_ps( M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps( M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2),
_mm_setr_ps( M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps( M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2),
_mm_setr_ps( M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps( M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2,- M_SQRT1_2, M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2,- M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2,- M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2),
_mm_setr_ps(-M_SQRT1_2,- M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2)
};
size_t inOffset = 0;
size_t outOffset = 0;
unsigned char tmp = 0;
for (size_t i = 0; i < dataIn->getLength(); i += d_carriers / 4) {
for (size_t j = 0; j < d_carriers / 8; ++j) {
tmp = (in[inOffset] & 0xc0) >> 4;
tmp |= (in[inOffset + (d_carriers / 8)] & 0xc0) >> 6;
out[outOffset] = symbols[tmp];
tmp = (in[inOffset] & 0x30) >> 2;
tmp |= (in[inOffset + (d_carriers / 8)] & 0x30) >> 4;
out[outOffset + 1] = symbols[tmp];
tmp = (in[inOffset] & 0x0c);
tmp |= (in[inOffset + (d_carriers / 8)] & 0x0c) >> 2;
out[outOffset + 2] = symbols[tmp];
tmp = (in[inOffset] & 0x03) << 2;
tmp |= (in[inOffset + (d_carriers / 8)] & 0x03);
out[outOffset + 3] = symbols[tmp];
++inOffset;
outOffset += 4;
}
inOffset += d_carriers / 8;
}
#else // !__SSE__
const unsigned char* in = reinterpret_cast<const unsigned char*>(dataIn->getData());
float* out = reinterpret_cast<float*>(dataOut->getData());
if (dataIn->getLength() % (d_carriers / 4) != 0) {
throw std::runtime_error(
"QpskSymbolMapper::process input size not valid!");
}
if (dataOut->getLength() / sizeof(float) != dataIn->getLength() * 4 * 2) { // 4 output complex symbols per input byte
throw std::runtime_error(
"QpskSymbolMapper::process output size not valid!");
}
const static float symbols[16][4] = {
{ M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2},
{ M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2},
{ M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2, M_SQRT1_2},
{ M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2},
{ M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2},
{ M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2},
{ M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2},
{ M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2},
{-M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2},
{-M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2},
{-M_SQRT1_2,- M_SQRT1_2, M_SQRT1_2, M_SQRT1_2},
{-M_SQRT1_2,- M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2},
{-M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2},
{-M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2},
{-M_SQRT1_2,- M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2},
{-M_SQRT1_2,- M_SQRT1_2, -M_SQRT1_2, -M_SQRT1_2}
};
size_t inOffset = 0;
size_t outOffset = 0;
unsigned char tmp;
for (size_t i = 0; i < dataIn->getLength(); i += d_carriers / 4) {
for (size_t j = 0; j < d_carriers / 8; ++j) {
tmp = (in[inOffset] & 0xc0) >> 4;
tmp |= (in[inOffset + (d_carriers / 8)] & 0xc0) >> 6;
memcpy(&out[outOffset], symbols[tmp], sizeof(float) * 4);
tmp = (in[inOffset] & 0x30) >> 2;
tmp |= (in[inOffset + (d_carriers / 8)] & 0x30) >> 4;
memcpy(&out[outOffset + 4], symbols[tmp], sizeof(float) * 4);
tmp = (in[inOffset] & 0x0c);
tmp |= (in[inOffset + (d_carriers / 8)] & 0x0c) >> 2;
memcpy(&out[outOffset + 8], symbols[tmp], sizeof(float) * 4);
tmp = (in[inOffset] & 0x03) << 2;
tmp |= (in[inOffset + (d_carriers / 8)] & 0x03);
memcpy(&out[outOffset + 12], symbols[tmp], sizeof(float) * 4);
++inOffset;
outOffset += 4*4;
}
inOffset += d_carriers / 8;
}
#endif // __SSE__
return 1;
}
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