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/***************************************************/
/*! \class PitShift
\brief STK simple pitch shifter effect class.
This class implements a simple pitch shifter
using a delay line.
by Perry R. Cook and Gary P. Scavone, 1995--2023.
*/
/***************************************************/
#include "PitShift.h"
#include <cmath>
namespace stk {
PitShift :: PitShift( void )
{
delayLength_ = maxDelay - 24;
halfLength_ = delayLength_ / 2;
delay_[0] = 12;
delay_[1] = maxDelay / 2;
delayLine_.setMaximumDelay( maxDelay );
delayLine_.setDelay( delay_[0] );
effectMix_ = 0.5;
rate_ = 1.0;
}
void PitShift :: clear()
{
delayLine_.clear();
lastFrame_[0] = 0.0;
}
void PitShift :: setShift( StkFloat shift )
{
if ( shift < 1.0 ) {
rate_ = 1.0 - shift;
}
else if ( shift > 1.0 ) {
rate_ = 1.0 - shift;
}
else {
rate_ = 0.0;
delay_[0] = halfLength_ + 12;
}
}
StkFrames& PitShift :: tick( StkFrames& frames, unsigned int channel )
{
#if defined(_STK_DEBUG_)
if ( channel >= frames.channels() ) {
oStream_ << "PitShift::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 = tick( *samples );
return frames;
}
StkFrames& PitShift :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
{
#if defined(_STK_DEBUG_)
if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
oStream_ << "PitShift::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 = tick( *iSamples );
return iFrames;
}
} // stk namespace
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