Audio Spectrum: Increased performance by 25 % by directly painting lines instead...

[kdenlive] / src / audioscopes / audiospectrum.h

diff --git a/src/audioscopes/audiospectrum.h b/src/audioscopes/audiospectrum.h
index a70ab0ca3902b568d607f30ff62889ad9870a0e3..057dcdeed531cebaca19158de404a599834ec6ba 100644 (file)
--- a/src/audioscopes/audiospectrum.h
+++ b/src/audioscopes/audiospectrum.h
@@ -1,35 +1,108 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Simon Andreas Eugster (simon.eu@gmail.com)      *
+ *   This file is part of kdenlive. See www.kdenlive.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.                                   *
+ ***************************************************************************/
+
+/**
+   Displays a spectral power distribution of audio samples.
+   The frequency distribution is calculated by means of a Fast Fourier Transformation.
+   For more information see Wikipedia:FFT and the code comments.
+*/
+
 #ifndef AUDIOSPECTRUM_H
 #define AUDIOSPECTRUM_H
 
+// Enables debugging
+//#define DEBUG_AUDIOSPEC
+
 #include <QtCore>
+#include <QVector>
+#include <QHash>
 
 #include "abstractaudioscopewidget.h"
 #include "ui_audiospectrum_ui.h"
+#include "tools/kiss_fftr.h"
+#include "ffttools.h"
 
 class AudioSpectrum_UI;
-
 class AudioSpectrum : public AbstractAudioScopeWidget {
     Q_OBJECT
 
 public:
-    AudioSpectrum(Monitor *projMonitor, Monitor *clipMonitor, QWidget *parent = 0);
+    AudioSpectrum(QWidget *parent = 0);
+    ~AudioSpectrum();
 
     // Implemented virtual methods
     QString widgetName() const;
 
+
 protected:
     ///// Implemented methods /////
     QRect scopeRect();
     QImage renderHUD(uint accelerationFactor);
-    QImage renderScope(uint accelerationFactor, const QVector<int16_t> audioFrame, const int freq, const int num_channels, const int num_samples);
+    QImage renderAudioScope(uint accelerationFactor, const QVector<int16_t> audioFrame, const int freq, const int num_channels, const int num_samples, const int newData);
     QImage renderBackground(uint accelerationFactor);
     bool isHUDDependingOnInput() const;
     bool isScopeDependingOnInput() const;
     bool isBackgroundDependingOnInput() const;
     virtual void readConfig();
+    void writeConfig();
+
+    virtual void handleMouseDrag(const QPoint movement, const RescaleDirection rescaleDirection, const Qt::KeyboardModifiers rescaleModifiers);
 
 private:
     Ui::AudioSpectrum_UI *ui;
+
+    QAction *m_aResetHz;
+    QAction *m_aTrackMouse;
+
+    FFTTools m_fftTools;
+    QVector<float> m_lastFFT;
+    QSemaphore m_lastFFTLock;
+
+    /** Contains the plot only; m_scopeRect contains text and widgets as well */
+    QRect m_innerScopeRect;
+
+    /** Lower bound for the dB value to display */
+    int m_dBmin;
+    /** Upper bound (max: 0) */
+    int m_dBmax;
+
+    /** Maximum frequency (limited by the sampling rate if determined automatically).
+        Stored for the painters. */
+    uint m_freqMax;
+    /** The user has chosen a custom frequency. */
+    bool m_customFreq;
+
+    /** This is linear interpolation with the special property that it preserves peaks, which is required
+        for e.g. showing correct Decibel values (where the peak values are of interest).
+        Consider f = {0, 100, 0}
+                 x = {0.5,  1.5}: With default linear interpolation x0 and x1 would both be mapped to 50.
+        This function maps x1 (the first position after the peak) to 100.
+
+        @param in           The source vector containing the data
+        @param targetSize   Number of interpolation nodes between ...
+        @param left         the left array index in the in-vector and ...
+        @param right        the right array index (both inclusive).
+        @param fill         If right lies outside of the array bounds (which is perfectly fine here) then this value
+                            will be used for filling the missing information.
+        */
+    static const QVector<float> interpolatePeakPreserving(const QVector<float> in, const uint targetSize, uint left = 0, uint right = 0, float fill = 0.0);
+
+#ifdef DEBUG_AUDIOSPEC
+    long m_timeTotal;
+    long m_showTotal;
+#endif
+
+
+private slots:
+    void slotResetMaxFreq();
+
 };
 
 #endif // AUDIOSPECTRUM_H