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153 lines
4.2 KiB
C++
153 lines
4.2 KiB
C++
#ifndef STK_BANDEDWG_H
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#define STK_BANDEDWG_H
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#include "Instrmnt.h"
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#include "DelayL.h"
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#include "BowTable.h"
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#include "ADSR.h"
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#include "BiQuad.h"
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namespace stk {
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/***************************************************/
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/*! \class BandedWG
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\brief Banded waveguide modeling class.
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This class uses banded waveguide techniques to
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model a variety of sounds, including bowed
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bars, glasses, and bowls. For more
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information, see Essl, G. and Cook, P. "Banded
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Waveguides: Towards Physical Modelling of Bar
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Percussion Instruments", Proceedings of the
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1999 International Computer Music Conference.
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Control Change Numbers:
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- Bow Pressure = 2
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- Bow Motion = 4
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- Strike Position = 8 (not implemented)
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- Vibrato Frequency = 11
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- Gain = 1
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- Bow Velocity = 128
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- Set Striking = 64
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- Instrument Presets = 16
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- Uniform Bar = 0
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- Tuned Bar = 1
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- Glass Harmonica = 2
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- Tibetan Bowl = 3
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by Georg Essl, 1999 - 2004.
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Modified for STK 4.0 by Gary Scavone.
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*/
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/***************************************************/
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const int MAX_BANDED_MODES = 20;
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class BandedWG : public Instrmnt
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{
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public:
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//! Class constructor.
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BandedWG( void );
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//! Class destructor.
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~BandedWG( void );
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//! Reset and clear all internal state.
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void clear( void );
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//! Set strike position (0.0 - 1.0).
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void setStrikePosition( StkFloat position );
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//! Select a preset.
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void setPreset( int preset );
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//! Set instrument parameters for a particular frequency.
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void setFrequency( StkFloat frequency );
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//! Apply bow velocity/pressure to instrument with given amplitude and rate of increase.
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void startBowing( StkFloat amplitude, StkFloat rate );
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//! Decrease bow velocity/breath pressure with given rate of decrease.
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void stopBowing( StkFloat rate );
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//! Pluck the instrument with given amplitude.
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void pluck( StkFloat amp );
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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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//! 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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StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
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protected:
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bool doPluck_;
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bool trackVelocity_;
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int nModes_;
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int presetModes_;
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BowTable bowTable_;
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ADSR adsr_;
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BiQuad bandpass_[MAX_BANDED_MODES];
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DelayL delay_[MAX_BANDED_MODES];
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StkFloat maxVelocity_;
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StkFloat modes_[MAX_BANDED_MODES];
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StkFloat frequency_;
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StkFloat baseGain_;
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StkFloat gains_[MAX_BANDED_MODES];
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StkFloat basegains_[MAX_BANDED_MODES];
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StkFloat excitation_[MAX_BANDED_MODES];
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StkFloat integrationConstant_;
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StkFloat velocityInput_;
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StkFloat bowVelocity_;
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StkFloat bowTarget_;
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StkFloat bowPosition_;
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StkFloat strikeAmp_;
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int strikePosition_;
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};
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inline StkFrames& BandedWG :: tick( StkFrames& frames, unsigned int channel )
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{
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unsigned int nChannels = lastFrame_.channels();
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#if defined(_STK_DEBUG_)
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if ( channel > frames.channels() - nChannels ) {
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oStream_ << "BandedWG::tick(): channel and StkFrames arguments are incompatible!";
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handleError( StkError::FUNCTION_ARGUMENT );
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}
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#endif
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StkFloat *samples = &frames[channel];
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unsigned int j, hop = frames.channels() - nChannels;
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if ( nChannels == 1 ) {
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for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
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*samples++ = tick();
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}
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else {
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for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
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*samples++ = tick();
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for ( j=1; j<nChannels; j++ )
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*samples++ = lastFrame_[j];
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}
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}
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return frames;
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}
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} // stk namespace
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#endif
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