/usr/include/stk/BowTable.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 | #ifndef STK_BOWTABL_H
#define STK_BOWTABL_H
#include "Function.h"
#include <cmath>
namespace stk {
/***************************************************/
/*! \class BowTable
\brief STK bowed string table class.
This class implements a simple bowed string
non-linear function, as described by Smith
(1986). The output is an instantaneous
reflection coefficient value.
by Perry R. Cook and Gary P. Scavone, 1995-2012.
*/
/***************************************************/
class BowTable : public Function
{
public:
//! Default constructor.
BowTable( void ) : offset_(0.0), slope_(0.1), minOutput_(0.01), maxOutput_(0.98) {};
//! Set the table offset value.
/*!
The table offset is a bias which controls the
symmetry of the friction. If you want the
friction to vary with direction, use a non-zero
value for the offset. The default value is zero.
*/
void setOffset( StkFloat offset ) { offset_ = offset; };
//! Set the table slope value.
/*!
The table slope controls the width of the friction
pulse, which is related to bow force.
*/
void setSlope( StkFloat slope ) { slope_ = slope; };
//! Set the minimum table output value (0.0 - 1.0).
void setMinOutput( StkFloat minimum ) { minOutput_ = minimum; };
//! Set the maximum table output value (0.0 - 1.0).
void setMaxOutput( StkFloat maximum ) { maxOutput_ = maximum; };
//! Take one sample input and map to one sample of output.
StkFloat tick( StkFloat input );
//! Take a channel of the StkFrames object as inputs to the table and replace with corresponding outputs.
/*!
The StkFrames argument reference is returned. 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 );
//! Take a channel of the \c iFrames object as inputs to the table and write outputs to the \c oFrames object.
/*!
The \c iFrames object reference is returned. Each channel
argument must be less than the number of channels in the
corresponding 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& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
protected:
StkFloat offset_;
StkFloat slope_;
StkFloat minOutput_;
StkFloat maxOutput_;
};
inline StkFloat BowTable :: tick( StkFloat input )
{
// The input represents differential string vs. bow velocity.
StkFloat sample = input + offset_; // add bias to input
sample *= slope_; // then scale it
lastFrame_[0] = (StkFloat) fabs( (double) sample ) + (StkFloat) 0.75;
lastFrame_[0] = (StkFloat) pow( lastFrame_[0], (StkFloat) -4.0 );
// Set minimum threshold
if ( lastFrame_[0] < minOutput_ ) lastFrame_[0] = minOutput_;
// Set maximum threshold
if ( lastFrame_[0] > maxOutput_ ) lastFrame_[0] = maxOutput_;
return lastFrame_[0];
}
inline StkFrames& BowTable :: tick( StkFrames& frames, unsigned int channel )
{
#if defined(_STK_DEBUG_)
if ( channel >= frames.channels() ) {
oStream_ << "BowTable::tick(): channel and StkFrames arguments are incompatible!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
StkFloat *samples = &frames[channel];
unsigned int hop = frames.channels();
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
*samples = *samples + offset_;
*samples *= slope_;
*samples = (StkFloat) fabs( (double) *samples ) + 0.75;
*samples = (StkFloat) pow( *samples, (StkFloat) -4.0 );
if ( *samples > 1.0) *samples = 1.0;
}
lastFrame_[0] = *(samples-hop);
return frames;
}
inline StkFrames& BowTable :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
{
#if defined(_STK_DEBUG_)
if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
oStream_ << "BowTable::tick(): channel and StkFrames arguments are incompatible!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
StkFloat *iSamples = &iFrames[iChannel];
StkFloat *oSamples = &oFrames[oChannel];
unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
*oSamples = *iSamples + offset_;
*oSamples *= slope_;
*oSamples = (StkFloat) fabs( (double) *oSamples ) + 0.75;
*oSamples = (StkFloat) pow( *oSamples, (StkFloat) -4.0 );
if ( *oSamples > 1.0) *oSamples = 1.0;
}
lastFrame_[0] = *(oSamples-oHop);
return iFrames;
}
} // stk namespace
#endif
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