e1lama/stk
1
0
Fork 0
mirror of https://github.com/thestk/stk synced 2026-04-25 00:28:37 +00:00
Code Issues Packages Projects Releases Wiki Activity

Version 4.4.0

Browse Source
This commit is contained in:
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
Download Patch File Download Diff File Expand all files Collapse all files

100
include/JetTable.h
View File

@@ -1,3 +1,10 @@
#ifndef STK_JETTABL_H
#define STK_JETTABL_H
#include "Function.h"
namespace stk {
/***************************************************/
/*! \class JetTable
\brief STK jet table class.
@@ -9,28 +16,97 @@
Consult Fletcher and Rossing, Karjalainen,
Cook, and others for more information.
by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
by Perry R. Cook and Gary P. Scavone, 1995 - 2009.
*/
/***************************************************/
#ifndef STK_JETTABL_H
#define STK_JETTABL_H
#include "Function.h"
class JetTable : public Function
{
public:
//! Default constructor.
JetTable();
//! Class destructor.
~JetTable();
//! Take one sample input and map to one sample of output.
StkFloat tick( StkFloat input );
protected:
//! 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 );
StkFloat computeSample( StkFloat input );
//! 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 );
};
inline StkFloat JetTable :: tick( StkFloat input )
{
// Perform "table lookup" using a polynomial
// calculation (x^3 - x), which approximates
// the jet sigmoid behavior.
lastFrame_[0] = input * (input * input - 1.0);
// Saturate at +/- 1.0.
if ( lastFrame_[0] > 1.0 ) lastFrame_[0] = 1.0;
if ( lastFrame_[0] < -1.0 ) lastFrame_[0] = -1.0;
return lastFrame_[0];
}
inline StkFrames& JetTable :: tick( StkFrames& frames, unsigned int channel )
{
#if defined(_STK_DEBUG_)
if ( channel >= frames.channels() ) {
errorString_ << "JetTable::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 * (*samples * *samples - 1.0);
if ( *samples > 1.0) *samples = 1.0;
if ( *samples < -1.0) *samples = -1.0;
}
lastFrame_[0] = *(samples-hop);
return frames;
}
inline StkFrames& JetTable :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
{
#if defined(_STK_DEBUG_)
if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
errorString_ << "JetTable::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 = *oSamples * (*oSamples * *oSamples - 1.0);
if ( *oSamples > 1.0) *oSamples = 1.0;
if ( *oSamples < -1.0) *oSamples = -1.0;
}
lastFrame_[0] = *(oSamples-oHop);
return iFrames;
}
} // stk namespace
#endif