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// outputfunction.h
/******************************************************************************
*
* MiXViews - an X window system based sound & data editor/processor
*
* Copyright (c) 1993, 1994 Regents of the University of California
*
* Author: Douglas Scott
* Date: December 13, 1994
*
* Permission to use, copy and modify this software and its documentation
* for research and/or educational purposes and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation. The author reserves the right to distribute this
* software and its documentation. The University of California and the author
* make no representations about the suitability of this software for any
* purpose, and in no event shall University of California be liable for any
* damage, loss of data, or profits resulting from its use.
* It is provided "as is" without express or implied warranty.
*
******************************************************************************/
// Subclasses of ProcessFunction designed for producing samples rather than
// processing them. Direct subclasses of this are used for synthesis objects
// (see synthfunction.h). Other subclasses include the InputOutputFunction
// class (see iofunction.h).
//
// The current class heirarchy here is unsatisfactory, and will be reworked
// in a later version.
#ifndef OUTPUTFUNCTION_H
#ifdef __GNUG__
#pragma interface
#endif
#define OUTPUTFUNCTION_H
#include "localdefs.h"
#include "processfun.h"
#include "queue.h"
class Data;
// an OutputFunction produces samples but takes no samples as input
class OutputFunction : public ProcessFunction {
public:
OutputFunction(Data* output) : ProcessFunction(output) {}
virtual double operator () (RunStatus *status) = 0;
protected:
redefined int doApply(Data *);
};
// a QueuedOutputFunction buffers output data before returning it
class QueuedOutputFunction : public OutputFunction {
public:
QueuedOutputFunction(Data* output, int queueSize);
virtual ~QueuedOutputFunction() {}
redefined void restoreState();
redefined double operator () (RunStatus *status);
protected:
virtual RunStatus runProcess();
virtual int doProcessing() = 0;
int outQueueEmpty();
int outQueueFull();
int addToOutQueue(double value);
double takeFromOutQueue();
void setOutQueueSize(int size);
private:
Queue outputQueue;
};
inline int
QueuedOutputFunction::outQueueEmpty() { return outputQueue.empty(); }
inline int
QueuedOutputFunction::outQueueFull() { return outputQueue.full(); }
inline int
QueuedOutputFunction::addToOutQueue(double value) {
BUG("OutputFunction::addToOutQueue()");
return (outputQueue.addTo(value).full() != true);
}
inline double
QueuedOutputFunction::takeFromOutQueue() {
BUG("OutputFunction::takeFromOutQueue()");
return outputQueue.takeFrom();
}
#endif
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