fftwengine.cpp

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#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();
}