mirror of
https://github.com/thestk/stk
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108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
#ifndef STK_BLOWBOTL_H
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#define STK_BLOWBOTL_H
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#include "Instrmnt.h"
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#include "JetTable.h"
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#include "BiQuad.h"
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#include "PoleZero.h"
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#include "Noise.h"
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#include "ADSR.h"
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#include "SineWave.h"
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namespace stk {
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/***************************************************/
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/*! \class BlowBotl
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\brief STK blown bottle instrument class.
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This class implements a helmholtz resonator
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(biquad filter) with a polynomial jet
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excitation (a la Cook).
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Control Change Numbers:
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- Noise Gain = 4
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- Vibrato Frequency = 11
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- Vibrato Gain = 1
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- Volume = 128
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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 BlowBotl : public Instrmnt
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{
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public:
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//! Class constructor.
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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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BlowBotl( void );
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//! Class destructor.
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~BlowBotl( 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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void setFrequency( StkFloat frequency );
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//! Apply breath velocity to instrument with given amplitude and rate of increase.
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void startBlowing( StkFloat amplitude, StkFloat rate );
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//! Decrease breath velocity with given rate of decrease.
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void stopBlowing( StkFloat rate );
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//! Start a note with the given frequency and amplitude.
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void noteOn( StkFloat frequency, StkFloat amplitude );
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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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void controlChange( int number, StkFloat value );
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//! Compute and return one output sample.
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StkFloat tick( unsigned int channel = 0 );
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protected:
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JetTable jetTable_;
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BiQuad resonator_;
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PoleZero dcBlock_;
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Noise noise_;
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ADSR adsr_;
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SineWave vibrato_;
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StkFloat maxPressure_;
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StkFloat noiseGain_;
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StkFloat vibratoGain_;
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StkFloat outputGain_;
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};
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inline StkFloat BlowBotl :: tick( unsigned int )
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{
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StkFloat breathPressure;
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StkFloat randPressure;
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StkFloat pressureDiff;
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// Calculate the breath pressure (envelope + vibrato)
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breathPressure = maxPressure_ * adsr_.tick();
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breathPressure += vibratoGain_ * vibrato_.tick();
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pressureDiff = breathPressure - resonator_.lastOut();
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randPressure = noiseGain_ * noise_.tick();
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randPressure *= breathPressure;
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randPressure *= (1.0 + pressureDiff);
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resonator_.tick( breathPressure + randPressure - ( jetTable_.tick( pressureDiff ) * pressureDiff ) );
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lastFrame_[0] = 0.2 * outputGain_ * dcBlock_.tick( pressureDiff );
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return lastFrame_[0];
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}
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} // stk namespace
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#endif
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