mirror of
https://github.com/cookiengineer/audacity
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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/***************************************************/
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/*! \class Function
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\brief STK abstract function parent class.
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This class provides common functionality for STK classes which
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implement tables or other types of input to output function
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mappings.
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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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#include "Stk.h"
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#ifndef STK_FUNCTION_H
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#define STK_FUNCTION_H
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namespace Nyq
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{
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class Function : public Stk
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{
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public:
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//! Class constructor.
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Function();
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//! Class destructor.
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virtual ~Function();
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//! Return the last output value.
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virtual StkFloat lastOut() const { return lastOutput_; };
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//! Take one sample input and compute one sample of output.
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StkFloat tick( StkFloat input );
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//! Take a channel of the StkFrames object as inputs to the function and replace with corresponding 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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virtual StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
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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( StkFloat input ) = 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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