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livetrax/gtk2_ardour/fft.h

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/*
* Copyright (C) 2008 Sampo Savolainen <v2@iki.fi>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
{
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public:
FFT (uint32_t);
~FFT ();
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enum WindowingType {
NONE,
HANN
};
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void reset ();
void analyze (ARDOUR::Sample*, WindowingType w = NONE);
void calculate ();
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uint32_t bins () const { return _data_size; }
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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]; }
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private:
float* get_hann_window ();
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uint32_t const _window_size;
uint32_t const _data_size;
uint32_t _iterations;
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float* _hann_window;
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float* _fftInput;
float* _fftOutput;
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float* _power_at_bin;
float* _phase_at_bin;
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fftwf_plan _plan;
};
}
#endif