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78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
#ifndef STK_SAMPLER_H
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#define STK_SAMPLER_H
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#include "Instrmnt.h"
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#include "ADSR.h"
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#include "FileLoop.h"
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#include "OnePole.h"
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namespace stk {
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/***************************************************/
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/*! \class Sampler
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\brief STK sampling synthesis abstract base class.
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This instrument provides an ADSR envelope, a one-pole filter, and
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structures for an arbitrary number of attack and looped files.
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by Perry R. Cook and Gary P. Scavone, 1995-2012.
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*/
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/***************************************************/
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class Sampler : public Instrmnt
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{
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public:
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//! Default constructor.
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Sampler( void );
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//! Class destructor.
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virtual ~Sampler( void );
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//! Reset and clear all internal state.
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void clear( void );
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//! Set instrument parameters for a particular frequency.
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virtual void setFrequency( StkFloat frequency ) = 0;
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//! Initiate the envelopes with a key-on event and reset the attack waves.
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void keyOn( void );
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//! Signal a key-off event to the envelopes.
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void keyOff( void );
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//! Stop a note with the given amplitude (speed of decay).
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virtual void noteOff( StkFloat amplitude );
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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 ) = 0;
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//! Compute and return one output sample.
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virtual StkFloat tick( unsigned int channel = 0 ) = 0;
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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 must be less than the number of
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channels in the StkFrames argument (the first channel is specified
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by 0). However, range checking is only performed if _STK_DEBUG_
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is defined during compilation, in which case an out-of-range value
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will trigger an StkError exception.
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*/
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virtual StkFrames& tick( StkFrames& frames, unsigned int channel = 0 ) = 0;
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protected:
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ADSR adsr_;
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std::vector<FileWvIn *> attacks_;
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std::vector<FileLoop *> loops_;
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OnePole filter_;
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StkFloat baseFrequency_;
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std::vector<StkFloat> attackRatios_;
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std::vector<StkFloat> loopRatios_;
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StkFloat attackGain_;
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StkFloat loopGain_;
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};
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} // stk namespace
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#endif
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