videovisualspectrum.h

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#ifndef VIDEOVISUALSPECTRUM_H
#define VIDEOVISUALSPECTRUM_H
 
#include <QVector>
#include "videovisual.h"
 
extern "C" {
#include "libavutil/mem.h"
#include "libavcodec/avfft.h"
}
 
#define SPECTRUM_NAME QString("Spectrum")
 
class VideoVisualSpectrum : public VideoVisual
{
  public:
    VideoVisualSpectrum(AudioPlayer* Audio, MythRender* Render);
    ~VideoVisualSpectrum() override;
 
    void    Draw    (QRect Area, MythPainter* Painter, QPaintDevice* Device) override;
    QString Name    () override { return SPECTRUM_NAME; }
    void    prepare () override;
 
  protected:
    virtual bool Initialise     (QRect Area);
    virtual bool InitialisePriv ();
    virtual void DrawPriv       (MythPainter* Painter, QPaintDevice* Device);
 
    int                m_numSamples  { 64 };
    QVector<double>    m_magnitudes;
    double             m_range       { 1.0 };
    LogScale           m_scale;
    double             m_scaleFactor { 2.0 };
    double             m_falloff     { 3.0 };
 
    FFTComplex*        m_dftL              { nullptr };
    FFTComplex*        m_dftR              { nullptr };
    FFTContext*        m_fftContextForward { nullptr };
 
  private:
    QVector<QRect>     m_rects;
    int                m_barWidth    { 1 };
};
 
#endif