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sdrangel/sdrbase/dsp/decimatorc.cpp

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 Edouard Griffiths, F4EXB //
// //
// This program 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 as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include "decimatorc.h"
DecimatorC::DecimatorC() :
m_log2Decim(0),
m_decim(1)
{}
void DecimatorC::setLog2Decim(unsigned int log2Decim)
{
m_log2Decim = log2Decim;
m_decim = 1 << log2Decim;
}
bool DecimatorC::decimate(Complex c, Complex& cd)
{
if (m_log2Decim == 0) { // no decimation hence no translation possible
return true;
}
if (m_log2Decim == 1) {
return decimate2(c, cd);
} else if (m_log2Decim == 2) {
return decimate4(c, cd);
} else if (m_log2Decim == 3) {
return decimate8(c, cd);
} else if (m_log2Decim == 4) {
return decimate16(c, cd);
} else if (m_log2Decim == 5) {
return decimate32(c, cd);
} else if (m_log2Decim == 6) {
return decimate64(c, cd);
} else {
return true; // no decimation
}
}
bool DecimatorC::decimate2(Complex c, Complex& cd)
{
float x = c.real();
float y = c.imag();
bool done2 = m_decimator2.workDecimateCenter(&x, &y);
if (done2)
{
cd.real(x);
cd.imag(y);
}
return done2;
}
bool DecimatorC::decimate4(Complex c, Complex& cd)
{
float x = c.real();
float y = c.imag();
bool done2 = m_decimator2.workDecimateCenter(&x, &y);
if (done2)
{
bool done4 = m_decimator4.workDecimateCenter(&x, &y);
if (done4)
{
cd.real(x);
cd.imag(y);
return true;
}
}
return false;
}
bool DecimatorC::decimate8(Complex c, Complex& cd)
{
float x = c.real();
float y = c.imag();
bool done2 = m_decimator2.workDecimateCenter(&x, &y);
if (done2)
{
bool done4 = m_decimator4.workDecimateCenter(&x, &y);
if (done4)
{
bool done8 = m_decimator8.workDecimateCenter(&x, &y);
if (done8)
{
cd.real(x);
cd.imag(y);
return true;
}
}
}
return false;
}
bool DecimatorC::decimate16(Complex c, Complex& cd)
{
float x = c.real();
float y = c.imag();
bool done2 = m_decimator2.workDecimateCenter(&x, &y);
if (done2)
{
bool done4 = m_decimator4.workDecimateCenter(&x, &y);
if (done4)
{
bool done8 = m_decimator8.workDecimateCenter(&x, &y);
if (done8)
{
bool done16 = m_decimator16.workDecimateCenter(&x, &y);
if (done16)
{
cd.real(x);
cd.imag(y);
return true;
}
}
}
}
return false;
}
bool DecimatorC::decimate32(Complex c, Complex& cd)
{
float x = c.real();
float y = c.imag();
bool done2 = m_decimator2.workDecimateCenter(&x, &y);
if (done2)
{
bool done4 = m_decimator4.workDecimateCenter(&x, &y);
if (done4)
{
bool done8 = m_decimator8.workDecimateCenter(&x, &y);
if (done8)
{
bool done16 = m_decimator16.workDecimateCenter(&x, &y);
if (done16)
{
bool done32 = m_decimator32.workDecimateCenter(&x, &y);
if (done32)
{
cd.real(x);
cd.imag(y);
return true;
}
}
}
}
}
return false;
}
bool DecimatorC::decimate64(Complex c, Complex& cd)
{
float x = c.real();
float y = c.imag();
bool done2 = m_decimator2.workDecimateCenter(&x, &y);
if (done2)
{
bool done4 = m_decimator4.workDecimateCenter(&x, &y);
if (done4)
{
bool done8 = m_decimator8.workDecimateCenter(&x, &y);
if (done8)
{
bool done16 = m_decimator16.workDecimateCenter(&x, &y);
if (done16)
{
bool done32 = m_decimator32.workDecimateCenter(&x, &y);
if (done32)
{
bool done64 = m_decimator32.workDecimateCenter(&x, &y);
if (done64)
{
cd.real(x);
cd.imag(y);
return true;
}
}
}
}
}
}
return false;
}