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125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
#ifndef STK_MOOG_H
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#define STK_MOOG_H
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#include "Sampler.h"
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#include "FormSwep.h"
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namespace stk {
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/***************************************************/
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/*! \class Moog
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\brief STK moog-like swept filter sampling synthesis class.
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This instrument uses one attack wave, one
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looped wave, and an ADSR envelope (inherited
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from the Sampler class) and adds two sweepable
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formant (FormSwep) filters.
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Control Change Numbers:
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- Filter Q = 2
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- Filter Sweep Rate = 4
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- Vibrato Frequency = 11
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- Vibrato Gain = 1
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- Gain = 128
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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 Moog : public Sampler
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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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Moog( void );
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//! Class destructor.
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~Moog( void );
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//! Set instrument parameters for a particular frequency.
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void setFrequency( StkFloat frequency );
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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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//! Set the modulation (vibrato) speed in Hz.
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void setModulationSpeed( StkFloat mSpeed ) { loops_[1]->setFrequency( mSpeed ); };
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//! Set the modulation (vibrato) depth.
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void setModulationDepth( StkFloat mDepth ) { modDepth_ = mDepth * 0.5; };
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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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FormSwep filters_[2];
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StkFloat modDepth_;
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StkFloat filterQ_;
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StkFloat filterRate_;
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};
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inline StkFloat Moog :: tick( unsigned int )
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{
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StkFloat temp;
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if ( modDepth_ != 0.0 ) {
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temp = loops_[1]->tick() * modDepth_;
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loops_[0]->setFrequency( baseFrequency_ * (1.0 + temp) );
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}
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temp = attackGain_ * attacks_[0]->tick();
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temp += loopGain_ * loops_[0]->tick();
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temp = filter_.tick( temp );
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temp *= adsr_.tick();
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temp = filters_[0].tick( temp );
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lastFrame_[0] = filters_[1].tick( temp );
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return lastFrame_[0] * 6.0;
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}
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inline StkFrames& Moog :: 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_ << "Moog::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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