sdrangel/sdrbase/dsp/fftwengine.cpp

70 wiersze
1.6 KiB
C++
Czysty Zwykły widok Historia

#include <QTime>
#include "dsp/fftwengine.h"
FFTWEngine::FFTWEngine() :
m_plans(),
m_currentPlan(NULL)
{
}
FFTWEngine::~FFTWEngine()
{
freeAll();
}
void FFTWEngine::configure(int n, bool inverse)
{
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);
QTime t;
t.start();
m_globalPlanMutex.lock();
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 %dms", 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();
}