76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
/*
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* Copyright (C) 2008 Sampo Savolainen <v2@iki.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __ardour_fft_h__
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#define __ardour_fft_h__
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#include <iostream>
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#include <stdio.h>
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#include <sys/types.h>
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#include <complex> // this needs to be included before fftw3.h
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#include <fftw3.h>
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#include "ardour/types.h"
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namespace GTKArdour {
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class FFT
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{
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public:
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FFT (uint32_t);
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~FFT ();
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enum WindowingType {
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NONE,
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HANN
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};
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void reset ();
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void analyze (ARDOUR::Sample*, WindowingType w = NONE);
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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]; }
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float phase_at_bin (uint32_t i) const { return _phase_at_bin[i]; }
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private:
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float* get_hann_window ();
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uint32_t const _window_size;
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uint32_t const _data_size;
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uint32_t _iterations;
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float* _hann_window;
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float* _fftInput;
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float* _fftOutput;
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float* _power_at_bin;
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float* _phase_at_bin;
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fftwf_plan _plan;
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};
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}
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#endif
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