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154 lines
4.2 KiB
C++
154 lines
4.2 KiB
C++
#ifndef STK_MODAL_H
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#define STK_MODAL_H
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#include "Instrmnt.h"
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#include "Envelope.h"
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#include "FileLoop.h"
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#include "SineWave.h"
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#include "BiQuad.h"
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#include "OnePole.h"
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namespace stk {
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/***************************************************/
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/*! \class Modal
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\brief STK resonance model abstract base class.
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This class contains an excitation wavetable,
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an envelope, an oscillator, and N resonances
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(non-sweeping BiQuad filters), where N is set
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during instantiation.
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by Perry R. Cook and Gary P. Scavone, 1995-2012.
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*/
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/***************************************************/
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class Modal : public Instrmnt
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{
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public:
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//! Class constructor, taking the desired number of modes to create.
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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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Modal( unsigned int modes = 4 );
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//! Class destructor.
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virtual ~Modal( 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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virtual void setFrequency( StkFloat frequency );
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//! Set the ratio and radius for a specified mode filter.
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void setRatioAndRadius( unsigned int modeIndex, StkFloat ratio, StkFloat radius );
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//! Set the master gain.
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void setMasterGain( StkFloat aGain ) { masterGain_ = aGain; };
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//! Set the direct gain.
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void setDirectGain( StkFloat aGain ) { directGain_ = aGain; };
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//! Set the gain for a specified mode filter.
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void setModeGain( unsigned int modeIndex, StkFloat gain );
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//! Initiate a strike with the given amplitude (0.0 - 1.0).
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virtual void strike( StkFloat amplitude );
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//! Damp modes with a given decay factor (0.0 - 1.0).
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void damp( StkFloat amplitude );
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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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virtual void controlChange( int number, StkFloat value ) = 0;
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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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Envelope envelope_;
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FileWvIn *wave_;
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BiQuad **filters_;
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OnePole onepole_;
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SineWave vibrato_;
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unsigned int nModes_;
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std::vector<StkFloat> ratios_;
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std::vector<StkFloat> radii_;
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StkFloat vibratoGain_;
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StkFloat masterGain_;
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StkFloat directGain_;
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StkFloat stickHardness_;
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StkFloat strikePosition_;
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StkFloat baseFrequency_;
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};
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inline StkFloat Modal :: tick( unsigned int )
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{
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StkFloat temp = masterGain_ * onepole_.tick( wave_->tick() * envelope_.tick() );
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StkFloat temp2 = 0.0;
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for ( unsigned int i=0; i<nModes_; i++ )
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temp2 += filters_[i]->tick(temp);
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temp2 -= temp2 * directGain_;
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temp2 += directGain_ * temp;
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if ( vibratoGain_ != 0.0 ) {
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// Calculate AM and apply to master out
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temp = 1.0 + ( vibrato_.tick() * vibratoGain_ );
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temp2 = temp * temp2;
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}
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lastFrame_[0] = temp2;
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return lastFrame_[0];
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}
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inline StkFrames& Modal :: 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_ << "Modal::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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