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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 "PhaseReference.h"
#include "PcDebug.h"
#include <stdio.h>
#include <stdexcept>
#include <complex>
#include <string.h>
typedef std::complex<float> complexf;
/* ETSI EN 300 401 Table 43 (Clause 14.3.2)
* Contains h_{i,k} values
*/
const unsigned char PhaseReference::d_h[4][32] = {
/* h0 */ { 0, 2, 0, 0, 0, 0, 1, 1, 2, 0, 0, 0, 2, 2, 1, 1,
0, 2, 0, 0, 0, 0, 1, 1, 2, 0, 0, 0, 2, 2, 1, 1 },
/* h1 */ { 0, 3, 2, 3, 0, 1, 3, 0, 2, 1, 2, 3, 2, 3, 3, 0,
0, 3, 2, 3, 0, 1, 3, 0, 2, 1, 2, 3, 2, 3, 3, 0 },
/* h2 */ { 0, 0, 0, 2, 0, 2, 1, 3, 2, 2, 0, 2, 2, 0, 1, 3,
0, 0, 0, 2, 0, 2, 1, 3, 2, 2, 0, 2, 2, 0, 1, 3 },
/* h3 */ { 0, 1, 2, 1, 0, 3, 3, 2, 2, 3, 2, 1, 2, 1, 3, 2,
0, 1, 2, 1, 0, 3, 3, 2, 2, 3, 2, 1, 2, 1, 3, 2 }
};
/* EN 300 401, Clause 14.3.2:
* \phi_k = (\pi / 2) * (h_{i,k-k'} + n
*
* where "The indices i, k' and the parameter n are specified as functions of
* the carrier index k for the four transmission modes in tables 44 to 47."
*
* Tables 44 to 47 describe the frequency interleaving done in
* FrequencyInterleaver.
*/
PhaseReference::PhaseReference(unsigned int dabmode) :
ModCodec(ModFormat(0), ModFormat(0)),
d_dabmode(dabmode)
{
PDEBUG("PhaseReference::PhaseReference(%u) @ %p\n", dabmode, this);
switch (d_dabmode) {
case 1:
d_carriers = 1536;
d_num = 2048;
break;
case 2:
d_carriers = 384;
d_num = 512;
break;
case 3:
d_carriers = 192;
d_num = 256;
break;
case 4:
d_dabmode = 0;
case 0:
d_carriers = 768;
d_num = 1024;
break;
default:
throw std::runtime_error(
"PhaseReference::PhaseReference DAB mode not valid!");
}
d_dataIn.resize(d_carriers);
fillData();
myOutputFormat.size(d_carriers * sizeof(complexf));
}
PhaseReference::~PhaseReference()
{
PDEBUG("PhaseReference::~PhaseReference() @ %p\n", this);
}
complexf convert(unsigned char data) {
const complexf value[] = {
complexf(1, 0),
complexf(0, 1),
complexf(-1, 0),
complexf(0, -1),
};
return value[data % 4];
}
void PhaseReference::fillData()
{
size_t index;
size_t offset;
size_t k;
const int table[][48][2] = {
{ // Mode 0/4
// Positive part
{ 0, 0 }, { 3, 1 }, { 2, 0 }, { 1, 2 }, { 0, 0 }, { 3, 1 },
{ 2, 2 }, { 1, 2 }, { 0, 2 }, { 3, 1 }, { 2, 3 }, { 1, 0 },
// Negative part
{ 0, 0 }, { 1, 1 }, { 2, 1 }, { 3, 2 }, { 0, 2 }, { 1, 2 },
{ 2, 0 }, { 3, 3 }, { 0, 3 }, { 1, 1 }, { 2, 3 }, { 3, 2 },
},
{ // Mode 1
// Positive part
{ 0, 3 }, { 3, 1 }, { 2, 1 }, { 1, 1 }, { 0, 2 }, { 3, 2 },
{ 2, 1 }, { 1, 0 }, { 0, 2 }, { 3, 2 }, { 2, 3 }, { 1, 3 },
{ 0, 0 }, { 3, 2 }, { 2, 1 }, { 1, 3 }, { 0, 3 }, { 3, 3 },
{ 2, 3 }, { 1, 0 }, { 0, 3 }, { 3, 0 }, { 2, 1 }, { 1, 1 },
// Negative part
{ 0, 1 }, { 1, 2 }, { 2, 0 }, { 3, 1 }, { 0, 3 }, { 1, 2 },
{ 2, 2 }, { 3, 3 }, { 0, 2 }, { 1, 1 }, { 2, 2 }, { 3, 3 },
{ 0, 1 }, { 1, 2 }, { 2, 3 }, { 3, 3 }, { 0, 2 }, { 1, 2 },
{ 2, 2 }, { 3, 1 }, { 0, 1 }, { 1, 3 }, { 2, 1 }, { 3, 2 },
},
{ // Mode 2
// Positive part
{ 2, 0 }, { 1, 2 }, { 0, 2 }, { 3, 1 }, { 2, 0 }, { 1, 3 },
// Negative part
{ 0, 2 }, { 1, 3 }, { 2, 2 }, { 3, 2 }, { 0, 1 }, { 1, 2 },
},
{ // Mode 3
// Positive part
{ 3, 2 }, { 2, 2 }, { 1, 2 },
// Negative part
{ 0, 2 }, { 1, 3 }, { 2, 0 },
},
};
if (d_dabmode > 3) {
throw std::runtime_error(
"PhaseReference::fillData invalid DAB mode!");
}
if (d_dataIn.size() != d_carriers) {
throw std::runtime_error(
"PhaseReference::fillData d_dataIn has incorrect size!");
}
for (index = 0, offset = 0; index < d_dataIn.size(); ++offset) {
for (k = 0; k < 32; ++k) {
d_dataIn[index++] = convert(d_h[table[d_dabmode][offset][0]][k]
+ table[d_dabmode][offset][1]);
}
}
}
int PhaseReference::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("PhaseReference::process(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
if ((dataIn != NULL) && (dataIn->getLength() != 0)) {
throw std::runtime_error(
"PhaseReference::process input size not valid!");
}
dataOut->setData(&d_dataIn[0], d_carriers * sizeof(complexf));
return 1;
}
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