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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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160
include/BiQuad.h
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@@ -1,23 +1,23 @@
/***************************************************/
/*! \class BiQuad
\brief STK biquad (two-pole, two-zero) filter class.
This protected Filter subclass implements a
two-pole, two-zero digital filter. A method
is provided for creating a resonance in the
frequency response while maintaining a constant
filter gain.
by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
*/
/***************************************************/
#ifndef STK_BIQUAD_H
#define STK_BIQUAD_H
#include "Filter.h"
class BiQuad : protected Filter
namespace stk {
/***************************************************/
/*! \class BiQuad
\brief STK biquad (two-pole, two-zero) filter class.
This class implements a two-pole, two-zero digital filter.
Methods are provided for creating a resonance or notch in the
frequency response while maintaining a constant filter gain.
by Perry R. Cook and Gary P. Scavone, 1995 - 2009.
*/
/***************************************************/
class BiQuad : public Filter
{
public:
@@ -25,28 +25,28 @@ public:
BiQuad();
//! Class destructor.
virtual ~BiQuad();
~BiQuad();
//! A function to enable/disable the automatic updating of class data when the STK sample rate changes.
void ignoreSampleRateChange( bool ignore = true ) { ignoreSampleRateChange_ = ignore; };
//! Clears all internal states of the filter.
void clear(void);
//! Set all filter coefficients.
void setCoefficients( StkFloat b0, StkFloat b1, StkFloat b2, StkFloat a1, StkFloat a2, bool clearState = false );
//! Set the b[0] coefficient value.
void setB0(StkFloat b0);
void setB0( StkFloat b0 ) { b_[0] = b0; };
//! Set the b[1] coefficient value.
void setB1(StkFloat b1);
void setB1( StkFloat b1 ) { b_[1] = b1; };
//! Set the b[2] coefficient value.
void setB2(StkFloat b2);
void setB2( StkFloat b2 ) { b_[2] = b2; };
//! Set the a[1] coefficient value.
void setA1(StkFloat a1);
void setA1( StkFloat a1 ) { a_[1] = a1; };
//! Set the a[2] coefficient value.
void setA2(StkFloat a2);
void setA2( StkFloat a2 ) { a_[2] = a2; };
//! Sets the filter coefficients for a resonance at \e frequency (in Hz).
/*!
@@ -60,7 +60,7 @@ public:
frequency. The closer the poles are to the unit-circle (\e radius
close to one), the narrower the resulting resonance width.
*/
void setResonance(StkFloat frequency, StkFloat radius, bool normalize = false);
void setResonance( StkFloat frequency, StkFloat radius, bool normalize = false );
//! Set the filter coefficients for a notch at \e frequency (in Hz).
/*!
@@ -69,7 +69,7 @@ public:
and \e radius from the z-plane origin. No filter normalization
is attempted.
*/
void setNotch(StkFloat frequency, StkFloat radius);
void setNotch( StkFloat frequency, StkFloat radius );
//! Sets the filter zeroes for equal resonance gain.
/*!
@@ -78,62 +78,106 @@ public:
where R is the pole radius setting.
*/
void setEqualGainZeroes();
//! Set the filter gain.
/*!
The gain is applied at the filter input and does not affect the
coefficient values. The default gain value is 1.0.
*/
void setGain(StkFloat gain);
//! Return the current filter gain.
StkFloat getGain(void) const;
void setEqualGainZeroes( void );
//! Return the last computed output value.
StkFloat lastOut(void) const;
StkFloat lastOut( void ) const { return lastFrame_[0]; };
//! Input one sample to the filter and return one output.
virtual StkFloat tick(StkFloat sample);
//! Input one sample to the filter and return a reference to one output.
StkFloat tick( StkFloat input );
//! Take a channel of the StkFrames object as inputs to the filter and replace with corresponding outputs.
/*!
The \c channel argument should be zero or greater (the first
channel is specified by 0). An StkError will be thrown if the \c
channel argument is equal to or greater than the number of
channels in the StkFrames object.
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.
*/
virtual StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
//! Take a channel of the \c iFrames object as inputs to the filter 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:
// This function must be implemented in all subclasses. It is used
// to get around a C++ problem with overloaded virtual functions.
virtual StkFloat computeSample( StkFloat input );
virtual void sampleRateChanged( StkFloat newRate, StkFloat oldRate );
};
inline StkFloat BiQuad :: computeSample( StkFloat input )
inline StkFloat BiQuad :: tick( StkFloat input )
{
inputs_[0] = gain_ * input;
outputs_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
outputs_[0] -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
lastFrame_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
lastFrame_[0] -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
inputs_[2] = inputs_[1];
inputs_[1] = inputs_[0];
outputs_[2] = outputs_[1];
outputs_[1] = outputs_[0];
outputs_[1] = lastFrame_[0];
return outputs_[0];
}
inline StkFloat BiQuad :: tick( StkFloat input )
{
return this->computeSample( input );
return lastFrame_[0];
}
inline StkFrames& BiQuad :: tick( StkFrames& frames, unsigned int channel )
{
return Filter::tick( frames, channel );
#if defined(_STK_DEBUG_)
if ( channel >= frames.channels() ) {
errorString_ << "BiQuad::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 ) {
inputs_[0] = gain_ * *samples;
*samples = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
*samples -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
inputs_[2] = inputs_[1];
inputs_[1] = inputs_[0];
outputs_[2] = outputs_[1];
outputs_[1] = *samples;
}
lastFrame_[0] = outputs_[1];
return frames;
}
inline StkFrames& BiQuad :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
{
#if defined(_STK_DEBUG_)
if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
errorString_ << "BiQuad::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 ) {
inputs_[0] = gain_ * *iSamples;
*oSamples = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
*oSamples -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
inputs_[2] = inputs_[1];
inputs_[1] = inputs_[0];
outputs_[2] = outputs_[1];
outputs_[1] = *oSamples;
}
lastFrame_[0] = outputs_[1];
return iFrames;
}
} // stk namespace
#endif