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https://github.com/f4exb/sdrangel.git
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70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
#include <QTime>
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#include "dsp/fftwengine.h"
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FFTWEngine::FFTWEngine() :
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m_plans(),
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m_currentPlan(NULL)
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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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for(Plans::const_iterator it = m_plans.begin(); it != m_plans.end(); ++it) {
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if(((*it)->n == n) && ((*it)->inverse == inverse)) {
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m_currentPlan = *it;
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return;
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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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QTime t;
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t.start();
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m_globalPlanMutex.lock();
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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 %dms", 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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