mirror of
https://github.com/cookiengineer/audacity
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76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/***************************************************/
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/*! \class Instrmnt
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\brief STK instrument abstract base class.
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This class provides a common interface for
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all STK instruments.
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by Perry R. Cook and Gary P. Scavone, 1995 - 2005.
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*/
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/***************************************************/
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#ifndef STK_INSTRMNT_H
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#define STK_INSTRMNT_H
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#include "Stk.h"
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namespace Nyq
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{
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class Instrmnt : public Stk
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{
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public:
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//! Default constructor.
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Instrmnt();
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//! Class destructor.
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virtual ~Instrmnt();
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//! Start a note with the given frequency and amplitude.
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virtual void noteOn(StkFloat frequency, StkFloat amplitude) = 0;
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//! Stop a note with the given amplitude (speed of decay).
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virtual void noteOff(StkFloat amplitude) = 0;
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//! Set instrument parameters for a particular frequency.
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virtual void setFrequency(StkFloat frequency);
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//! Return the last output value.
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StkFloat lastOut() const;
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//! Return the last left output value.
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StkFloat lastOutLeft() const;
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//! Return the last right output value.
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StkFloat lastOutRight() const;
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//! Compute one sample and output.
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StkFloat tick( void );
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//! Fill a channel of the StkFrames object with computed outputs.
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/*!
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The \c channel argument should be zero or greater (the first
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channel is specified by 0). An StkError will be thrown if the \c
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channel argument is equal to or greater than the number of
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channels in the StkFrames object.
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*/
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StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
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//! Perform the control change specified by \e number and \e value (0.0 - 128.0).
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virtual void controlChange(int number, StkFloat value);
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protected:
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// This abstract function must be implemented in all subclasses.
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// It is used to get around a C++ problem with overloaded virtual
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// functions.
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virtual StkFloat computeSample( void ) = 0;
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StkFloat lastOutput_;
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};
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} // namespace Nyq
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#endif
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