annotate data/model/DenseThreeDimensionalModel.h @ 1196:c7b9c902642f 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 Chris Cannam and 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 _DENSE_THREE_DIMENSIONAL_MODEL_H_
#define _DENSE_THREE_DIMENSIONAL_MODEL_H_

#include "Model.h"
#include "TabularModel.h"
#include "base/ColumnOp.h"
#include "base/ZoomConstraint.h"
#include "base/RealTime.h"

#include <QMutex>
#include <QVector>

class DenseThreeDimensionalModel : public Model,
                                   public TabularModel
{
    Q_OBJECT

public:
    /**
     * Return the number of sample frames covered by each column of bins.
     */
    virtual int getResolution() const = 0;

    /**
     * Return the number of columns of bins in the model.
     */
    virtual int getWidth() const = 0;

    /**
     * Return the number of bins in each column.
     */
    virtual int getHeight() const = 0; 

    /**
     * Return the minimum permissible value in each bin.
     */
    virtual float getMinimumLevel() const = 0;

    /**
     * Return the maximum permissible value in each bin.
     */
    virtual float getMaximumLevel() const = 0;

    typedef ColumnOp::Column Column;

    /**
     * Get data from the given column of bin values.
     */
    virtual Column getColumn(int column) const = 0;

    /**
     * Get the single data point from the n'th bin of the given column.
     */
    virtual float getValueAt(int column, int n) const = 0;

    /**
     * Get the name of a given bin (i.e. a label to associate with
     * that bin across all columns).
     */
    virtual QString getBinName(int n) const = 0;

    /**
     * Return true if the bins have values as well as names. If this
     * returns true, getBinValue() may be used to retrieve the values.
     */
    virtual bool hasBinValues() const { return false; }

    /**
     * Return the value of bin n, if any. This is a "vertical scale"
     * value which does not vary from one column to the next. This is
     * only meaningful if hasBinValues() returns true.
     */
    virtual float getBinValue(int n) const { return float(n); }

    /**
     * Obtain the name of the unit of the values returned from
     * getBinValue(), if any.
     */
    virtual QString getBinValueUnit() const { return ""; }

    /**
     * Estimate whether a logarithmic scale might be appropriate for
     * the value scale.
     */
    virtual bool shouldUseLogValueScale() const = 0;

    /**
     * Utility function to query whether a given bin is greater than
     * its (vertical) neighbours.
     */
    bool isLocalPeak(int x, int y) {
        float value = getValueAt(x, y);
        if (y > 0 && value < getValueAt(x, y - 1)) return false;
        if (y < getHeight() - 1 && value < getValueAt(x, y + 1)) return false;
        return true;
    }

    /**
     * Utility function to query whether a given bin is greater than a
     * certain threshold.
     */
    bool isOverThreshold(int x, int y, float threshold) {
        return getValueAt(x, y) > threshold;
    }

    QString getTypeName() const { return tr("Dense 3-D"); }

    virtual int getCompletion() const = 0;

    /*
       TabularModel methods.
       This class is non-editable -- subclasses may be editable.
       Row and column are transposed for the tabular view (which is
       "on its side").
     */
    
    virtual int getRowCount() const { return getWidth(); }
    virtual int getColumnCount() const { return getHeight() + 2; }

    virtual QString getHeading(int column) const
    {
        switch (column) {
        case 0: return tr("Time");
        case 1: return tr("Frame");
        default: return getBinName(column - 2);
        }
    }

    virtual QVariant getData(int row, int column, int) const 
    {
        switch (column) {
        case 0: {
            RealTime rt = RealTime::frame2RealTime
                (row * getResolution() + getStartFrame(), getSampleRate());
            return rt.toText().c_str();
        }
        case 1:
            return int(row * getResolution() + getStartFrame());
        default:
            return getValueAt(row, column - 2);
        }
    }

    virtual bool isColumnTimeValue(int col) const {
        return col < 2;
    }
    virtual SortType getSortType(int) const {
        return SortNumeric;
    }

    virtual sv_frame_t getFrameForRow(int row) const {
        return sv_frame_t(row) * getResolution() + getStartFrame();
    }
    virtual int getRowForFrame(sv_frame_t frame) const {
        return int((frame - getStartFrame()) / getResolution());
    }

protected:
    DenseThreeDimensionalModel() { }
};

#endif