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sdrangel/sdrbase/dsp/fftwengine.cpp

111 lines
3.7 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2015-2020 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 <QElapsedTimer>
#include "dsp/fftwengine.h"
FFTWEngine::FFTWEngine(const QString& fftWisdomFileName) :
m_fftWisdomFileName(fftWisdomFileName),
m_plans(),
m_currentPlan(nullptr),
m_reuse(true)
{
}
FFTWEngine::~FFTWEngine()
{
freeAll();
}
void FFTWEngine::configure(int n, bool inverse)
{
if (m_reuse)
{
for (Plans::const_iterator it = m_plans.begin(); it != m_plans.end(); ++it)
{
if (((*it)->n == n) && ((*it)->inverse == inverse))
{
m_currentPlan = *it;
return;
}
}
}
m_currentPlan = new Plan;
m_currentPlan->n = n;
m_currentPlan->inverse = inverse;
m_currentPlan->in = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * n);
m_currentPlan->out = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * n);
QElapsedTimer t;
t.start();
m_globalPlanMutex.lock();
if (m_fftWisdomFileName.size() > 0)
{
int rc = fftwf_import_wisdom_from_filename(m_fftWisdomFileName.toStdString().c_str());
if (rc == 0) { // that's an error (undocumented)
qInfo("FFTWEngine::configure: importing from FFTW wisdom file: '%s' failed", qPrintable(m_fftWisdomFileName));
} else {
qDebug("FFTWEngine::configure: successfully imported from FFTW wisdom file: '%s'", qPrintable(m_fftWisdomFileName));
}
}
else
{
qDebug("FFTWEngine::configure: no FFTW wisdom file");
}
m_currentPlan->plan = fftwf_plan_dft_1d(n, m_currentPlan->in, m_currentPlan->out, inverse ? FFTW_BACKWARD : FFTW_FORWARD, FFTW_PATIENT);
m_globalPlanMutex.unlock();
qDebug("FFT: creating FFTW plan (n=%d,%s) took %lld ms", n, inverse ? "inverse" : "forward", t.elapsed());
m_plans.push_back(m_currentPlan);
}
void FFTWEngine::transform()
{
if(m_currentPlan != NULL)
fftwf_execute(m_currentPlan->plan);
}
Complex* FFTWEngine::in()
{
if(m_currentPlan != NULL)
return reinterpret_cast<Complex*>(m_currentPlan->in);
else return NULL;
}
Complex* FFTWEngine::out()
{
if(m_currentPlan != NULL)
return reinterpret_cast<Complex*>(m_currentPlan->out);
else return NULL;
}
QMutex FFTWEngine::m_globalPlanMutex;
void FFTWEngine::freeAll()
{
for(Plans::iterator it = m_plans.begin(); it != m_plans.end(); ++it) {
fftwf_destroy_plan((*it)->plan);
fftwf_free((*it)->in);
fftwf_free((*it)->out);
delete *it;
}
m_plans.clear();
}