/usr/include/stk/Bowed.h is in libstk0-dev 4.4.4-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 | #ifndef STK_BOWED_H
#define STK_BOWED_H
#include "Instrmnt.h"
#include "DelayL.h"
#include "BowTable.h"
#include "OnePole.h"
#include "BiQuad.h"
#include "SineWave.h"
#include "ADSR.h"
namespace stk {
/***************************************************/
/*! \class Bowed
\brief STK bowed string instrument class.
This class implements a bowed string model, a
la Smith (1986), after McIntyre, Schumacher,
Woodhouse (1983).
This is a digital waveguide model, making its
use possibly subject to patents held by
Stanford University, Yamaha, and others.
Control Change Numbers:
- Bow Pressure = 2
- Bow Position = 4
- Vibrato Frequency = 11
- Vibrato Gain = 1
- Bow Velocity = 100
- Frequency = 101
- Volume = 128
by Perry R. Cook and Gary P. Scavone, 1995-2012.
Contributions by Esteban Maestre, 2011.
*/
/***************************************************/
class Bowed : public Instrmnt
{
public:
//! Class constructor, taking the lowest desired playing frequency.
Bowed( StkFloat lowestFrequency = 8.0 );
//! Class destructor.
~Bowed( void );
//! Reset and clear all internal state.
void clear( void );
//! Set instrument parameters for a particular frequency.
void setFrequency( StkFloat frequency );
//! Set vibrato gain.
void setVibrato( StkFloat gain ) { vibratoGain_ = gain; };
//! Apply breath pressure to instrument with given amplitude and rate of increase.
void startBowing( StkFloat amplitude, StkFloat rate );
//! Decrease breath pressure with given rate of decrease.
void stopBowing( StkFloat rate );
//! Start a note with the given frequency and amplitude.
void noteOn( StkFloat frequency, StkFloat amplitude );
//! Stop a note with the given amplitude (speed of decay).
void noteOff( StkFloat amplitude );
//! Perform the control change specified by \e number and \e value (0.0 - 128.0).
void controlChange( int number, StkFloat value );
//! Compute and return one output sample.
StkFloat tick( unsigned int channel = 0 );
//! Fill a channel of the StkFrames object with computed outputs.
/*!
The \c channel argument must be less than the number of
channels in the StkFrames argument (the first channel is specified
by 0). However, range checking is only performed if _STK_DEBUG_
is defined during compilation, in which case an out-of-range value
will trigger an StkError exception.
*/
StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
protected:
DelayL neckDelay_;
DelayL bridgeDelay_;
BowTable bowTable_;
OnePole stringFilter_;
BiQuad bodyFilters_[6];
SineWave vibrato_;
ADSR adsr_;
bool bowDown_;
StkFloat maxVelocity_;
StkFloat baseDelay_;
StkFloat vibratoGain_;
StkFloat betaRatio_;
};
inline StkFloat Bowed :: tick( unsigned int )
{
StkFloat bowVelocity = maxVelocity_ * adsr_.tick();
StkFloat bridgeReflection = -stringFilter_.tick( bridgeDelay_.lastOut() );
StkFloat nutReflection = -neckDelay_.lastOut();
StkFloat stringVelocity = bridgeReflection + nutReflection;
StkFloat deltaV = bowVelocity - stringVelocity; // Differential velocity
StkFloat newVelocity = 0.0;
if ( bowDown_ )
newVelocity = deltaV * bowTable_.tick( deltaV ); // Non-Linear bow function
neckDelay_.tick( bridgeReflection + newVelocity); // Do string propagations
bridgeDelay_.tick(nutReflection + newVelocity);
if ( vibratoGain_ > 0.0 ) {
neckDelay_.setDelay( (baseDelay_ * (1.0 - betaRatio_) ) +
(baseDelay_ * vibratoGain_ * vibrato_.tick()) );
}
lastFrame_[0] = 0.1248 * bodyFilters_[5].tick( bodyFilters_[4].tick( bodyFilters_[3].tick( bodyFilters_[2].tick( bodyFilters_[1].tick( bodyFilters_[0].tick( bridgeDelay_.lastOut() ) ) ) ) ) );
return lastFrame_[0];
}
inline StkFrames& Bowed :: tick( StkFrames& frames, unsigned int channel )
{
unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
if ( channel > frames.channels() - nChannels ) {
oStream_ << "Bowed::tick(): channel and StkFrames arguments are incompatible!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
StkFloat *samples = &frames[channel];
unsigned int j, hop = frames.channels() - nChannels;
if ( nChannels == 1 ) {
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
*samples++ = tick();
}
else {
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
*samples++ = tick();
for ( j=1; j<nChannels; j++ )
*samples++ = lastFrame_[j];
}
}
return frames;
}
} // stk namespace
#endif
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