fft_result.h

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/*
 * Copyright (C) 2009-2012 David Robillard <d@drobilla.net>
 * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
 *
 * 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_result_h
#define __ardour_fft_result_h
 
#include <math.h>
#include <fftw3.h>
 
#include <gdkmm/color.h>
 
#include <string>
#include <vector>
 
class FFTGraph;
 
class FFTResult
{
public:
 
        ~FFTResult () = default;
 
        void analyzeWindow (float *window);
        void finalize ();
 
        unsigned int length () const { return _dataSize; }
 
        float avgAt (unsigned int x, bool p) const
        { return p ? _data_prop_avg[x] : _data_flat_avg[x]; }
        float maxAt (unsigned int x, bool p) const
        { return p ? _data_prop_max[x] : _data_flat_max[x]; }
        float minAt (unsigned int x, bool p) const
        { return p ? _data_prop_min[x] : _data_flat_min[x]; }
 
        float minimum (bool p) const
        { return p ? _min_prop : _min_flat; }
        float maximum (bool p) const
        { return p ? _max_prop : _max_flat; }
 
        const Gdk::Color& get_color () const { return _color; }
 
private:
        FFTResult (FFTGraph *graph, Gdk::Color color, std::string trackname);
        friend class FFTGraph;
 
        FFTGraph *_graph;
 
        unsigned int _windowSize;
        unsigned int _dataSize;
 
        int _averages;
 
        float _min_flat;
        float _max_flat;
        float _min_prop;
        float _max_prop;
 
        std::vector<float> _data_flat_avg;
        std::vector<float> _data_flat_max;
        std::vector<float> _data_flat_min;
        std::vector<float> _data_prop_avg;
        std::vector<float> _data_prop_max;
        std::vector<float> _data_prop_min;
 
        Gdk::Color _color;
        std::string _trackname;
 
        static float power_to_db (float v) { return v > 1e-20 ? 10.0f * log10f (v) : -200.0f; }
};
 
#endif /* __ardour_fft_result_h */