/usr/include/stk/Resonate.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 | #ifndef STK_RESONATE_H
#define STK_RESONATE_H
#include "Instrmnt.h"
#include "ADSR.h"
#include "BiQuad.h"
#include "Noise.h"
namespace stk {
/***************************************************/
/*! \class Resonate
\brief STK noise driven formant filter.
This instrument contains a noise source, which
excites a biquad resonance filter, with volume
controlled by an ADSR.
Control Change Numbers:
- Resonance Frequency (0-Nyquist) = 2
- Pole Radii = 4
- Notch Frequency (0-Nyquist) = 11
- Zero Radii = 1
- Envelope Gain = 128
by Perry R. Cook and Gary P. Scavone, 1995-2012.
*/
/***************************************************/
class Resonate : public Instrmnt
{
public:
//! Class constructor.
Resonate( void );
//! Class destructor.
~Resonate( void );
//! Reset and clear all internal state.
void clear( void );
//! Set the filter for a resonance at the given frequency (Hz) and radius.
void setResonance( StkFloat frequency, StkFloat radius );
//! Set the filter for a notch at the given frequency (Hz) and radius.
void setNotch( StkFloat frequency, StkFloat radius );
//! Set the filter zero coefficients for contant resonance gain.
void setEqualGainZeroes( void ) { filter_.setEqualGainZeroes(); };
//! Initiate the envelope with a key-on event.
void keyOn( void ) { adsr_.keyOn(); };
//! Signal a key-off event to the envelope.
void keyOff( void ) { adsr_.keyOff(); };
//! Start a note with the given frequency and amplitude.
void noteOn( StkFloat frequency, StkFloat amplitude );
//! Stop a note with the given amplitude (speed of decay).
void noteOff( StkFloat amplitude );
//! Perform the control change specified by \e number and \e value (0.0 - 128.0).
void controlChange( int number, StkFloat value );
//! Compute and return one output sample.
StkFloat tick( unsigned int channel = 0 );
//! Fill a channel of the StkFrames object with computed outputs.
/*!
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 );
protected:
ADSR adsr_;
BiQuad filter_;
Noise noise_;
StkFloat poleFrequency_;
StkFloat poleRadius_;
StkFloat zeroFrequency_;
StkFloat zeroRadius_;
};
inline StkFloat Resonate :: tick( unsigned int )
{
lastFrame_[0] = filter_.tick( noise_.tick() );
lastFrame_[0] *= adsr_.tick();
return lastFrame_[0];
}
inline StkFrames& Resonate :: tick( StkFrames& frames, unsigned int channel )
{
unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
if ( channel > frames.channels() - nChannels ) {
oStream_ << "Resonate::tick(): channel and StkFrames arguments are incompatible!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
StkFloat *samples = &frames[channel];
unsigned int j, hop = frames.channels() - nChannels;
if ( nChannels == 1 ) {
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
*samples++ = tick();
}
else {
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
*samples++ = tick();
for ( j=1; j<nChannels; j++ )
*samples++ = lastFrame_[j];
}
}
return frames;
}
} // stk namespace
#endif
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