Chris@49: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@0: 
Chris@0: /*
Chris@52:     Sonic Visualiser
Chris@52:     An audio file viewer and annotation editor.
Chris@52:     Centre for Digital Music, Queen Mary, University of London.
Chris@52:     This file copyright 2006 Chris Cannam.
Chris@0:     
Chris@52:     This program is free software; you can redistribute it and/or
Chris@52:     modify it under the terms of the GNU General Public License as
Chris@52:     published by the Free Software Foundation; either version 2 of the
Chris@52:     License, or (at your option) any later version.  See the file
Chris@52:     COPYING included with this distribution for more information.
Chris@0: */
Chris@0: 
Chris@0: #ifndef _MODEL_H_
Chris@0: #define _MODEL_H_
Chris@0: 
Chris@0: #include <vector>
Chris@0: #include <QObject>
Chris@0: 
Chris@3: #include "XmlExportable.h"
Chris@3: 
Chris@0: typedef std::vector<float> SampleBlock;
Chris@0: 
Chris@0: /** 
Chris@0:  * Model is the base class for all data models that represent any sort
Chris@0:  * of data on a time scale based on an audio frame rate.
Chris@0:  */
Chris@0: 
Chris@3: class Model : virtual public QObject,
Chris@3: 	      public XmlExportable
Chris@0: {
Chris@0:     Q_OBJECT
Chris@0: 
Chris@0: public:
Chris@30:     virtual ~Model();
Chris@30: 
Chris@0:     /**
Chris@0:      * Return true if the model was constructed successfully.  Classes
Chris@0:      * that refer to the model should always test this before use.
Chris@0:      */
Chris@0:     virtual bool isOK() const = 0;
Chris@0: 
Chris@0:     /**
Chris@0:      * Return the first audio frame spanned by the model.
Chris@0:      */
Chris@0:     virtual size_t getStartFrame() const = 0;
Chris@0: 
Chris@0:     /**
Chris@0:      * Return the last audio frame spanned by the model.
Chris@0:      */
Chris@0:     virtual size_t getEndFrame() const = 0;
Chris@0: 
Chris@0:     /**
Chris@0:      * Return the frame rate in frames per second.
Chris@0:      */
Chris@0:     virtual size_t getSampleRate() const = 0;
Chris@0: 
Chris@0:     /**
Chris@0:      * Return a copy of this model.
Chris@0:      *
Chris@0:      * If the model is not editable, this may be effectively a shallow
Chris@0:      * copy.  If the model is editable, however, this operation must
Chris@0:      * properly copy all of the model's editable data.
Chris@0:      *
Chris@0:      * In general this operation is not useful for non-editable dense
Chris@0:      * models such as waveforms, because there may be no efficient
Chris@0:      * copy operation implemented -- for such models it is better not
Chris@0:      * to copy at all.
Chris@0:      *
Chris@0:      * Caller owns the returned value.
Chris@0:      */
Chris@0:     virtual Model *clone() const = 0;
Chris@0:     
Chris@0:     /**
Chris@0:      * Return true if the model has finished loading or calculating
Chris@0:      * all its data, for a model that is capable of calculating in a
Chris@0:      * background thread.  The default implementation is appropriate
Chris@0:      * for a thread that does not background any work but carries out
Chris@0:      * all its calculation from the constructor or accessors.
Chris@0:      *
Chris@0:      * If "completion" is non-NULL, this function should return
Chris@0:      * through it an estimated percentage value showing how far
Chris@0:      * through the background operation it thinks it is (for progress
Chris@0:      * reporting).  If it has no way to calculate progress, it may
Chris@0:      * return the special value COMPLETION_UNKNOWN.
Chris@0:      */
Chris@0:     virtual bool isReady(int *completion = 0) const {
Chris@0: 	bool ok = isOK();
Chris@0: 	if (completion) *completion = (ok ? 100 : 0);
Chris@0: 	return ok;
Chris@0:     }
Chris@0:     static const int COMPLETION_UNKNOWN;
Chris@0: 
Chris@3:     virtual QString toXmlString(QString indent = "",
Chris@3: 				QString extraAttributes = "") const;
Chris@3: 
Chris@0: signals:
Chris@0:     /**
Chris@0:      * Emitted when a model has been edited (or more data retrieved
Chris@0:      * from cache, in the case of a cached model that generates slowly)
Chris@0:      */
Chris@0:     void modelChanged();
Chris@0: 
Chris@0:     /**
Chris@0:      * Emitted when a model has been edited (or more data retrieved
Chris@0:      * from cache, in the case of a cached model that generates slowly)
Chris@0:      */
Chris@0:     void modelChanged(size_t startFrame, size_t endFrame);
Chris@0: 
Chris@0:     /**
Chris@0:      * Emitted when some internal processing has advanced a stage, but
Chris@0:      * the model has not changed externally.  Views should respond by
Chris@0:      * updating any progress meters or other monitoring, but not
Chris@0:      * refreshing the actual view.
Chris@0:      */
Chris@0:     void completionChanged();
Chris@0: 
Chris@0: protected:
Chris@0:     Model() { }
Chris@0: 
Chris@0:     // Not provided.
Chris@0:     Model(const Model &);
Chris@0:     Model &operator=(const Model &); 
Chris@0: };
Chris@0: 
Chris@0: #endif