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https://github.com/thestk/stk
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113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
#ifndef STK_FM_H
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#define STK_FM_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 "SineWave.h"
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#include "TwoZero.h"
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namespace stk {
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/***************************************************/
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/*! \class FM
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\brief STK abstract FM synthesis base class.
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This class controls an arbitrary number of
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waves and envelopes, determined via a
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constructor argument.
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Control Change Numbers:
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- Control One = 2
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- Control Two = 4
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- LFO Speed = 11
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- LFO Depth = 1
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- ADSR 2 & 4 Target = 128
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The basic Chowning/Stanford FM patent expired
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in 1995, but there exist follow-on patents,
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mostly assigned to Yamaha. If you are of the
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type who should worry about this (making
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money) worry away.
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by Perry R. Cook and Gary P. Scavone, 1995 - 2009.
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*/
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/***************************************************/
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class FM : public Instrmnt
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{
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public:
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//! Class constructor, taking the number of wave/envelope operators to control.
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/*!
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An StkError will be thrown if the rawwave path is incorrectly set.
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*/
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FM( unsigned int operators = 4 );
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//! Class destructor.
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virtual ~FM( void );
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//! Reset and clear all wave and envelope states.
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void clear( void );
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//! Load the rawwave filenames in waves.
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void loadWaves( const char **filenames );
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//! Set instrument parameters for a particular frequency.
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virtual void setFrequency( StkFloat frequency );
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//! Set the frequency ratio for the specified wave.
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void setRatio( unsigned int waveIndex, StkFloat ratio );
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//! Set the gain for the specified wave.
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void setGain( unsigned int waveIndex, StkFloat gain );
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//! Set the modulation speed in Hz.
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void setModulationSpeed( StkFloat mSpeed ) { vibrato_.setFrequency( mSpeed ); };
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//! Set the modulation depth.
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void setModulationDepth( StkFloat mDepth ) { modDepth_ = mDepth; };
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//! Set the value of control1.
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void setControl1( StkFloat cVal ) { control1_ = cVal * 2.0; };
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//! Set the value of control1.
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void setControl2( StkFloat cVal ) { control2_ = cVal * 2.0; };
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//! Start envelopes toward "on" targets.
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void keyOn( void );
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//! Start envelopes toward "off" targets.
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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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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 );
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//! Compute and return one output sample.
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virtual StkFloat tick( unsigned int ) = 0;
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protected:
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std::vector<ADSR *> adsr_;
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std::vector<FileLoop *> waves_;
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SineWave vibrato_;
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TwoZero twozero_;
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unsigned int nOperators_;
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StkFloat baseFrequency_;
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std::vector<StkFloat> ratios_;
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std::vector<StkFloat> gains_;
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StkFloat modDepth_;
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StkFloat control1_;
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StkFloat control2_;
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StkFloat fmGains_[100];
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StkFloat fmSusLevels_[16];
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StkFloat fmAttTimes_[32];
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};
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} // stk namespace
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#endif
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