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#include "CFFTW3.h"
#include <assert.h>
using namespace std;
#include <CppAddons/CAMath.h>
using namespace Math;
CFFTW3::CFFTW3(bool forward)
{
m_size = 0;
m_out = m_in = NULL;
m_plan = NULL;
m_forward = forward;
}
CFFTW3::CFFTW3(int n)
{
resize(n);
}
void CFFTW3::resize(int n)
{
assert(n>0);
m_size = n;
m_out = m_in = NULL;
m_in = new fftw_complex[m_size];
m_out = new fftw_complex[m_size];
in.resize(m_size);
out.resize(m_size);
// | FFTW_PRESERVE_INPUT
if(m_forward)
m_plan = fftw_plan_dft_1d(m_size, m_in, m_out, FFTW_FORWARD, FFTW_MEASURE);
else
m_plan = fftw_plan_dft_1d(m_size, m_in, m_out, FFTW_BACKWARD, FFTW_MEASURE);
}
void CFFTW3::execute()
{
execute(in, out);
}
void CFFTW3::execute(const vector<double>& in, vector<std::complex<double> >& out)
{
assert(int(in.size())>=m_size);
for(int i=0; i<m_size; i++)
{
m_in[i][0] = in[i];
m_in[i][1] = 0.0;
}
fftw_execute(m_plan);
if(int(out.size())<m_size)
out.resize(m_size);
for(int i=0; i<m_size; i++)
out[i] = make_complex(m_out[i]);
}
CFFTW3::~CFFTW3()
{
if(m_plan) fftw_destroy_plan(m_plan);
if(m_in) delete[] m_in;
if(m_out) delete[] m_out;
}
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