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Version 4.4.0

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Gary Scavone
2013-09-29 23:11:39 +02:00
committed by Stephen Sinclair
parent d199342e86
commit eccd8c9981
287 changed files with 11712 additions and 7676 deletions
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117
include/BowTable.h
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@@ -1,3 +1,11 @@
#ifndef STK_BOWTABL_H
#define STK_BOWTABL_H
#include "Function.h"
#include <cmath>
namespace stk {
/***************************************************/
/*! \class BowTable
\brief STK bowed string table class.
@@ -5,23 +13,15 @@
This class implements a simple bowed string
non-linear function, as described by Smith (1986).
by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
by Perry R. Cook and Gary P. Scavone, 1995 - 2009.
*/
/***************************************************/
#ifndef STK_BOWTABL_H
#define STK_BOWTABL_H
#include "Function.h"
class BowTable : public Function
{
public:
//! Default constructor.
BowTable();
//! Class destructor.
~BowTable();
BowTable( void ) : offset_(0.0), slope_(0.1) {};
//! Set the table offset value.
/*!
@@ -30,22 +30,111 @@ public:
friction to vary with direction, use a non-zero
value for the offset. The default value is zero.
*/
void setOffset(StkFloat offset);
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);
void setSlope( StkFloat slope ) { slope_ = slope; };
//! 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 computeSample( StkFloat input );
StkFloat offset_;
StkFloat slope_;
};
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 friction to 0.0
// if ( lastFrame_[0] < 0.0 ) lastFrame_[0] = 0.0;
// Set maximum friction to 1.0.
if ( lastFrame_[0] > 1.0 ) lastFrame_[0] = (StkFloat) 1.0;
return lastFrame_[0];
}
inline StkFrames& BowTable :: tick( StkFrames& frames, unsigned int channel )
{
#if defined(_STK_DEBUG_)
if ( channel >= frames.channels() ) {
errorString_ << "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() ) {
errorString_ << "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