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https://github.com/thestk/stk
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104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
/***************************************************/
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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 - 2002.
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*/
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/***************************************************/
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#if !defined(__FM_H)
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#define __FM_H
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#include "Instrmnt.h"
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#include "ADSR.h"
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#include "WaveLoop.h"
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#include "TwoZero.h"
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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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FM( int operators = 4 );
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//! Class destructor.
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virtual ~FM();
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//! Reset and clear all wave and envelope states.
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void clear();
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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(MY_FLOAT frequency);
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//! Set the frequency ratio for the specified wave.
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void setRatio(int waveIndex, MY_FLOAT ratio);
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//! Set the gain for the specified wave.
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void setGain(int waveIndex, MY_FLOAT gain);
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//! Set the modulation speed in Hz.
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void setModulationSpeed(MY_FLOAT mSpeed);
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//! Set the modulation depth.
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void setModulationDepth(MY_FLOAT mDepth);
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//! Set the value of control1.
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void setControl1(MY_FLOAT cVal);
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//! Set the value of control1.
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void setControl2(MY_FLOAT cVal);
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//! Start envelopes toward "on" targets.
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void keyOn();
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//! Start envelopes toward "off" targets.
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void keyOff();
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//! Stop a note with the given amplitude (speed of decay).
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void noteOff(MY_FLOAT amplitude);
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//! Pure virtual function ... must be defined in subclasses.
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virtual MY_FLOAT tick() = 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, MY_FLOAT value);
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protected:
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ADSR **adsr;
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WaveLoop **waves;
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WaveLoop *vibrato;
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TwoZero *twozero;
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int nOperators;
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MY_FLOAT baseFrequency;
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MY_FLOAT *ratios;
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MY_FLOAT *gains;
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MY_FLOAT modDepth;
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MY_FLOAT control1;
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MY_FLOAT control2;
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MY_FLOAT __FM_gains[100];
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MY_FLOAT __FM_susLevels[16];
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MY_FLOAT __FM_attTimes[32];
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};
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#endif
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