annotate data/model/DenseThreeDimensionalModel.h @ 335:02d2ad95ea52 spectrogram-cache-rejig

* Get storage advice for each cache in an FFT data server.  Allows us to be
  more confident about the actual memory situation and cut over from memory
  to disc part way through an FFT calculation if necessary.  StorageAdviser
  is now a bit too optimistic though (it's too keen to allocate large numbers
  of small blocks in memory).

/* -*- 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 "base/ZoomConstraint.h"

#include <QMutex>
#include <vector>

class DenseThreeDimensionalModel : public Model
{
    Q_OBJECT

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

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

    /**
     * Return the number of bins in each column.
     */
    virtual size_t 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;

    /**
     * Return true if there are data available for the given column.
     * This should return true only if getColumn(column) would not
     * have to do any substantial work to calculate its return values.
     * If this function returns false, it may still be possible to
     * retrieve the column, but its values may have to be calculated.
     */
    virtual bool isColumnAvailable(size_t column) const = 0;

    typedef std::vector<float> Column;

    /**
     * Get data from the given column of bin values.
     */
    virtual void getColumn(size_t column, Column &result) const = 0;

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

    /**
     * Utility function to query whether a given bin is greater than
     * its (vertical) neighbours.
     */
    bool isLocalPeak(size_t x, size_t 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(size_t x, size_t y, float threshold) {
        return getValueAt(x, y) > threshold;
    }

    virtual int getCompletion() const = 0;

protected:
    DenseThreeDimensionalModel() { }
};

#endif