annotate layer/SpectrumLayer.h @ 1127:9fb8dfd7ce4c spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 QMUL.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _SPECTRUM_LAYER_H_
#define _SPECTRUM_LAYER_H_

#include "SliceLayer.h"

#include "base/Window.h"

#include "data/model/DenseTimeValueModel.h"

#include <QColor>
#include <QMutex>

class FFTModel;

class SpectrumLayer : public SliceLayer
{
    Q_OBJECT

public:
    SpectrumLayer();
    ~SpectrumLayer();
    
    void setModel(DenseTimeValueModel *model);
    virtual const Model *getModel() const { return m_originModel; }

    virtual bool getCrosshairExtents(LayerGeometryProvider *, QPainter &, QPoint cursorPos,
                                     std::vector<QRect> &extents) const;
    virtual void paintCrosshairs(LayerGeometryProvider *, QPainter &, QPoint) const;

    virtual QString getFeatureDescription(LayerGeometryProvider *v, QPoint &) const;

    virtual void paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const;

    virtual VerticalPosition getPreferredFrameCountPosition() const {
	return PositionTop;
    }

    virtual PropertyList getProperties() const;
    virtual QString getPropertyLabel(const PropertyName &) const;
    virtual QString getPropertyIconName(const PropertyName &) const;
    virtual PropertyType getPropertyType(const PropertyName &) const;
    virtual QString getPropertyGroupName(const PropertyName &) const;
    virtual int getPropertyRangeAndValue(const PropertyName &,
                                         int *min, int *max, int *deflt) const;
    virtual QString getPropertyValueLabel(const PropertyName &,
					  int value) const;
    virtual RangeMapper *getNewPropertyRangeMapper(const PropertyName &) const;
    virtual void setProperty(const PropertyName &, int value);
    virtual void setProperties(const QXmlAttributes &);

    virtual bool getValueExtents(double &min, double &max,
                                 bool &logarithmic, QString &unit) const;

    virtual bool getXScaleValue(const LayerGeometryProvider *v, int x,
                                double &value, QString &unit) const;

    virtual bool getYScaleValue(const LayerGeometryProvider *, int y,
                                double &value, QString &unit) const;

    virtual bool getYScaleDifference(const LayerGeometryProvider *, int y0, int y1,
                                     double &diff, QString &unit) const;

    virtual bool isLayerScrollable(const LayerGeometryProvider *) const { return false; }

    void setChannel(int);
    int getChannel() const { return m_channel; }

    void setWindowSize(int);
    int getWindowSize() const { return m_windowSize; }
    
    void setWindowHopLevel(int level);
    int getWindowHopLevel() const { return m_windowHopLevel; }

    void setWindowType(WindowType type);
    WindowType getWindowType() const { return m_windowType; }

    void setShowPeaks(bool);
    bool getShowPeaks() const { return m_showPeaks; }

    virtual int getVerticalScaleWidth(LayerGeometryProvider *, bool, QPainter &) const { return 0; }

    virtual void toXml(QTextStream &stream, QString indent = "",
                       QString extraAttributes = "") const;

protected slots:
    void preferenceChanged(PropertyContainer::PropertyName name);

protected:
    // make this SliceLayer method unavailable to the general public
//    virtual void setModel(DenseThreeDimensionalModel *model) {
//        SliceLayer::setModel(model);
//    }

    DenseTimeValueModel    *m_originModel;
    int                     m_channel;
    bool                    m_channelSet;
    int                  m_windowSize;
    WindowType              m_windowType;
    int                  m_windowHopLevel;
    bool                    m_showPeaks;
    mutable bool            m_newFFTNeeded;

    mutable QMutex m_fftMutex;

    void setupFFT();

    virtual void getBiasCurve(BiasCurve &) const;
    BiasCurve m_biasCurve;

    virtual double getXForBin(int bin, int totalBins, double w) const;
    virtual int getBinForX(double x, int totalBins, double w) const;

    double getFrequencyForX(double x, double w) const;
    double getXForFrequency(double freq, double w) const;

    int getWindowIncrement() const {
        if (m_windowHopLevel == 0) return m_windowSize;
        else if (m_windowHopLevel == 1) return (m_windowSize * 3) / 4;
        else return m_windowSize / (1 << (m_windowHopLevel - 1));
    }
};

#endif