EqSpectrumView.h

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/* eqspectrumview.h - defination of EqSpectrumView class.
*
* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
*
* This file is part of LMMS - https://lmms.io
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
*/
#ifndef EQSPECTRUMVIEW_H
#define EQSPECTRUMVIEW_H
 
#include <QPainterPath>
#include <QWidget>
 
#include "fft_helpers.h"
#include "LmmsTypes.h"
 
namespace lmms
{
 
class SampleFrame;
 
const int MAX_BANDS = 2048;
class EqAnalyser
{
public:
        EqAnalyser();
        virtual ~EqAnalyser();
 
        float m_bands[MAX_BANDS];
        bool getInProgress();
        void clear();
 
        void analyze( SampleFrame* buf, const f_cnt_t frames );
 
        float getEnergy() const;
        int getSampleRate() const;
        bool getActive() const;
 
        void setActive(bool active);
 
private:
        fftwf_plan m_fftPlan;
        fftwf_complex * m_specBuf;
        float m_absSpecBuf[FFT_BUFFER_SIZE+1];
        float m_buffer[FFT_BUFFER_SIZE*2];
        int m_framesFilledUp;
        float m_energy;
        int m_sampleRate;
        bool m_active;
        bool m_inProgress;
        float m_fftWindow[FFT_BUFFER_SIZE];
};
 
 
namespace gui
{
 
class EqSpectrumView : public QWidget
{
        Q_OBJECT
public:
        explicit EqSpectrumView( EqAnalyser *b, QWidget *_parent = 0 );
        ~EqSpectrumView() override = default;
 
        QColor getColor() const;
        void setColor( const QColor &value );
 
protected:
        void paintEvent( QPaintEvent *event ) override;
 
private slots:
        void periodicalUpdate();
 
private:
        QColor m_color;
        EqAnalyser *m_analyser;
        QPainterPath m_path;
        float m_peakSum;
        float m_pixelsPerUnitWidth;
        float m_scale;
        int m_skipBands;
        bool m_periodicalUpdate;
        QList<float> m_bandHeight;
 
        float bandToFreq ( int index );
};
 
 
} // namespace gui
 
} // namespace lmms
 
#endif // EQSPECTRUMVIEW_H