Chris@320: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@320: 
Chris@320: /*
Chris@320:     Sonic Visualiser
Chris@320:     An audio file viewer and annotation editor.
Chris@320:     Centre for Digital Music, Queen Mary, University of London.
Chris@320:     This file copyright 2006 Chris Cannam.
Chris@320:    
Chris@320:     This program is free software; you can redistribute it and/or
Chris@320:     modify it under the terms of the GNU General Public License as
Chris@320:     published by the Free Software Foundation; either version 2 of the
Chris@320:     License, or (at your option) any later version.  See the file
Chris@320:     COPYING included with this distribution for more information.
Chris@320: */
Chris@320: 
Chris@320: #ifndef _TRANSFORM_H_
Chris@320: #define _TRANSFORM_H_
Chris@320: 
Chris@320: #include "base/Thread.h"
Chris@320: 
Chris@320: #include "data/model/Model.h"
Chris@320: 
Chris@320: typedef QString TransformId;
Chris@320: 
Chris@320: /**
Chris@320:  * A Transform turns one data model into another.
Chris@320:  *
Chris@320:  * Typically in this application, a Transform might have a
Chris@320:  * DenseTimeValueModel as its input (e.g. an audio waveform) and a
Chris@320:  * SparseOneDimensionalModel (e.g. detected beats) as its output.
Chris@320:  *
Chris@320:  * The Transform typically runs in the background, as a separate
Chris@320:  * thread populating the output model.  The model is available to the
Chris@320:  * user of the Transform immediately, but may be initially empty until
Chris@320:  * the background thread has populated it.
Chris@320:  */
Chris@320: 
Chris@320: class Transform : public Thread
Chris@320: {
Chris@320: public:
Chris@320:     virtual ~Transform();
Chris@320: 
Chris@320:     // Just a hint to the processing thread that it should give up.
Chris@320:     // Caller should still wait() and/or delete the transform before
Chris@320:     // assuming its input and output models are no longer required.
Chris@320:     void abandon() { m_abandoned = true; }
Chris@320: 
Chris@320:     Model *getInputModel()  { return m_input; }
Chris@320:     Model *getOutputModel() { return m_output; }
Chris@320:     Model *detachOutputModel() { m_detached = true; return m_output; }
Chris@320: 
Chris@320: protected:
Chris@320:     Transform(Model *m);
Chris@320: 
Chris@320:     Model *m_input; // I don't own this
Chris@320:     Model *m_output; // I own this, unless...
Chris@320:     bool m_detached; // ... this is true.
Chris@320:     bool m_abandoned;
Chris@320: };
Chris@320: 
Chris@320: #endif