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/*
Copyright (C) 2008 Paul Davis
Author: Sampo Savolainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_fft_h__
#define __ardour_fft_h__
#include <iostream>
#include <stdio.h>
#include <sys/types.h>
#include <complex> // this needs to be included before fftw3.h
#include <fftw3.h>
#include "ardour/types.h"
namespace GTKArdour {
class FFT
{
public:
FFT (uint32_t);
~FFT ();
enum WindowingType {
NONE,
HANN
};
void reset ();
void analyze (ARDOUR::Sample*, WindowingType w = NONE);
void calculate ();
uint32_t bins () const { return _data_size; }
float power_at_bin (uint32_t i) const { return _power_at_bin[i]; }
float phase_at_bin (uint32_t i) const { return _phase_at_bin[i]; }
private:
float* get_hann_window ();
uint32_t const _window_size;
uint32_t const _data_size;
uint32_t _iterations;
float* _hann_window;
float* _fftInput;
float* _fftOutput;
float* _power_at_bin;
float* _phase_at_bin;
fftwf_plan _plan;
};
}
#endif
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