mirror of
https://github.com/f4exb/sdrangel.git
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111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015-2020 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QElapsedTimer>
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#include "dsp/fftwengine.h"
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FFTWEngine::FFTWEngine(const QString& fftWisdomFileName) :
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m_fftWisdomFileName(fftWisdomFileName),
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m_plans(),
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m_currentPlan(nullptr),
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m_reuse(true)
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{
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}
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FFTWEngine::~FFTWEngine()
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{
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freeAll();
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}
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void FFTWEngine::configure(int n, bool inverse)
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{
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if (m_reuse)
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{
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for (Plans::const_iterator it = m_plans.begin(); it != m_plans.end(); ++it)
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{
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if (((*it)->n == n) && ((*it)->inverse == inverse))
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{
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m_currentPlan = *it;
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return;
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}
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}
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}
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m_currentPlan = new Plan;
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m_currentPlan->n = n;
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m_currentPlan->inverse = inverse;
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m_currentPlan->in = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * n);
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m_currentPlan->out = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * n);
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QElapsedTimer t;
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t.start();
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m_globalPlanMutex.lock();
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if (m_fftWisdomFileName.size() > 0)
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{
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int rc = fftwf_import_wisdom_from_filename(m_fftWisdomFileName.toStdString().c_str());
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if (rc == 0) { // that's an error (undocumented)
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qInfo("FFTWEngine::configure: importing from FFTW wisdom file: '%s' failed", qPrintable(m_fftWisdomFileName));
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} else {
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qDebug("FFTWEngine::configure: successfully imported from FFTW wisdom file: '%s'", qPrintable(m_fftWisdomFileName));
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}
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}
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else
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{
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qDebug("FFTWEngine::configure: no FFTW wisdom file");
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}
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m_currentPlan->plan = fftwf_plan_dft_1d(n, m_currentPlan->in, m_currentPlan->out, inverse ? FFTW_BACKWARD : FFTW_FORWARD, FFTW_PATIENT);
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m_globalPlanMutex.unlock();
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qDebug("FFT: creating FFTW plan (n=%d,%s) took %lld ms", n, inverse ? "inverse" : "forward", t.elapsed());
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m_plans.push_back(m_currentPlan);
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}
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void FFTWEngine::transform()
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{
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if(m_currentPlan != NULL)
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fftwf_execute(m_currentPlan->plan);
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}
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Complex* FFTWEngine::in()
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{
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if(m_currentPlan != NULL)
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return reinterpret_cast<Complex*>(m_currentPlan->in);
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else return NULL;
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}
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Complex* FFTWEngine::out()
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{
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if(m_currentPlan != NULL)
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return reinterpret_cast<Complex*>(m_currentPlan->out);
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else return NULL;
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}
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QMutex FFTWEngine::m_globalPlanMutex;
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void FFTWEngine::freeAll()
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{
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for(Plans::iterator it = m_plans.begin(); it != m_plans.end(); ++it) {
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fftwf_destroy_plan((*it)->plan);
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fftwf_free((*it)->in);
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fftwf_free((*it)->out);
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delete *it;
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}
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m_plans.clear();
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}
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