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b3054fd639
The spectural analysis was using a rectangle window, leading to high spectural leakage. This pull request uses the Blackman-Harris window to give a display more representative of the audio.
101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
/* eqspectrumview.h - defination of EqSpectrumView class.
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*
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* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (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 GNU
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* 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
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef EQSPECTRUMVIEW_H
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#define EQSPECTRUMVIEW_H
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#include <QPainter>
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#include <QWidget>
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#include "fft_helpers.h"
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#include "lmms_basics.h"
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#include "lmms_math.h"
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const int MAX_BANDS = 2048;
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class EqAnalyser
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{
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public:
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EqAnalyser();
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virtual ~EqAnalyser();
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float m_bands[MAX_BANDS];
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bool getInProgress();
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void clear();
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void analyze( sampleFrame *buf, const fpp_t frames );
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float getEnergy() const;
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int getSampleRate() const;
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bool getActive() const;
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void setActive(bool active);
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private:
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fftwf_plan m_fftPlan;
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fftwf_complex * m_specBuf;
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float m_absSpecBuf[FFT_BUFFER_SIZE+1];
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float m_buffer[FFT_BUFFER_SIZE*2];
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int m_framesFilledUp;
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float m_energy;
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int m_sampleRate;
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bool m_active;
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bool m_inProgress;
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float m_fftWindow[FFT_BUFFER_SIZE];
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};
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class EqSpectrumView : public QWidget
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{
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Q_OBJECT
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public:
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explicit EqSpectrumView( EqAnalyser *b, QWidget *_parent = 0 );
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virtual ~EqSpectrumView()
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{
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}
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QColor getColor() const;
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void setColor( const QColor &value );
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protected:
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virtual void paintEvent( QPaintEvent *event );
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private slots:
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void periodicalUpdate();
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private:
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QColor m_color;
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EqAnalyser *m_analyser;
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QPainterPath m_path;
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float m_peakSum;
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float m_pixelsPerUnitWidth;
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float m_scale;
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int m_skipBands;
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bool m_periodicalUpdate;
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QList<float> m_bandHeight;
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float bandToFreq ( int index );
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};
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#endif // EQSPECTRUMVIEW_H
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