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https://github.com/thestk/stk
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111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
#ifndef STK_BRASS_H
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#define STK_BRASS_H
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#include "Instrmnt.h"
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#include "DelayA.h"
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#include "BiQuad.h"
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#include "PoleZero.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 Brass
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\brief STK simple brass instrument class.
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This class implements a simple brass instrument
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waveguide model, a la Cook (TBone, HosePlayer).
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This is a digital waveguide model, making its
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use possibly subject to patents held by
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Stanford University, Yamaha, and others.
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Control Change Numbers:
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- Lip Tension = 2
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- Slide Length = 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 Brass: public Instrmnt
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{
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public:
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//! Class constructor, taking the lowest desired playing frequency.
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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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Brass( StkFloat lowestFrequency );
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//! Class destructor.
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~Brass( );
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//! Reset and clear all internal state.
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void clear( );
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//! Set instrument parameters for a particular frequency.
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void setFrequency( StkFloat frequency );
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//! Set the lips frequency.
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void setLip( StkFloat frequency );
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//! Apply breath pressure 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 pressure 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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DelayA delayLine_;
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BiQuad lipFilter_;
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PoleZero dcBlock_;
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ADSR adsr_;
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SineWave vibrato_;
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unsigned long length_;
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StkFloat lipTarget_;
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StkFloat slideTarget_;
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StkFloat vibratoGain_;
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StkFloat maxPressure_;
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};
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inline StkFloat Brass :: tick( unsigned int )
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{
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StkFloat breathPressure = maxPressure_ * adsr_.tick();
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breathPressure += vibratoGain_ * vibrato_.tick();
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StkFloat mouthPressure = 0.3 * breathPressure;
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StkFloat borePressure = 0.85 * delayLine_.lastOut();
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StkFloat deltaPressure = mouthPressure - borePressure; // Differential pressure.
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deltaPressure = lipFilter_.tick( deltaPressure ); // Force - > position.
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deltaPressure *= deltaPressure; // Basic position to area mapping.
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if ( deltaPressure > 1.0 ) deltaPressure = 1.0; // Non-linear saturation.
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// The following input scattering assumes the mouthPressure = area.
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lastFrame_[0] = deltaPressure * mouthPressure + ( 1.0 - deltaPressure) * borePressure;
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lastFrame_[0] = delayLine_.tick( dcBlock_.tick( lastFrame_[0] ) );
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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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