93 lines
1.9 KiB
C++
93 lines
1.9 KiB
C++
/***************************************************************************
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source::worx raDIYo
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Copyright © 2020-2022 c.holzheuer
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chris@sourceworx.org
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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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#ifndef SWFFTCALC_H
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#define SWFFTCALC_H
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#include <complex>
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#include <iostream>
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#include <valarray>
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#include <QObject>
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#include <QThread>
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#include <QAudioFormat>
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#include <QAudioProbe>
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#include <QAudioDeviceInfo>
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#include <QElapsedTimer>
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#include <raDIYoglobals.h>
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// Scale PCM value to [-1.0, 1.0]
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qreal xpcmToReal(qint16 pcm);
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/**
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* @brief Berechnet mittels FFT ein Spectrum
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* aus dem @see @QAudioBuffer. Das Spectrum wird beim
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* Abspielen eines Songs angezeigt.
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* @see SWSpectrumWidget
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* @see SWPlayerControl
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*/
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class SWFFTCalc : public QObject
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{
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Q_OBJECT
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public:
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explicit SWFFTCalc( QObject* parent = nullptr );
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virtual ~SWFFTCalc();
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signals:
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void spectrumReady( const SWValVec& spectrum );
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public slots:
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void onAudioProbed( const QAudioBuffer& audiobuffer );
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protected:
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using Complex = std::complex<double>;
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using CArray = std::valarray<Complex>;
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void bareFFT( CArray& x );
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static constexpr const int SWNumSamples = 4096;
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const double PI = 3.141592653589793238460;
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// Fudge factor used to calculate the spectrum bar heights
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//const qreal SpectrumAnalyserMultiplier = 0.15;
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const qreal SWFudgeFactor = 0.17;
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int _bufferDuration = 0;
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QElapsedTimer _timer;
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SWValVec _frames;
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SWValVec _hannWindow;
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// überdenken: geht das so schneller?
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// SWValVec _logscale;
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SWValVec _spectrum;
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CArray _complexFrame;
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};
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#endif // SWFFTCALC_H
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