/usr/include/stk/PercFlut.h is in libstk0-dev 4.4.3-2.
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_PERCFLUT_H
#define STK_PERCFLUT_H
#include "FM.h"
namespace stk {
/***************************************************/
/*! \class PercFlut
\brief STK percussive flute FM synthesis instrument.
This class implements algorithm 4 of the TX81Z.
\code
Algorithm 4 is : 4->3--\
2-- + -->1-->Out
\endcode
Control Change Numbers:
- Total Modulator Index = 2
- Modulator Crossfade = 4
- LFO Speed = 11
- LFO Depth = 1
- ADSR 2 & 4 Target = 128
The basic Chowning/Stanford FM patent expired
in 1995, but there exist follow-on patents,
mostly assigned to Yamaha. If you are of the
type who should worry about this (making
money) worry away.
by Perry R. Cook and Gary P. Scavone, 1995-2011.
*/
/***************************************************/
class PercFlut : public FM
{
public:
//! Class constructor.
/*!
An StkError will be thrown if the rawwave path is incorrectly set.
*/
PercFlut( void );
//! Class destructor.
~PercFlut( void );
//! Set instrument parameters for a particular frequency.
void setFrequency( StkFloat frequency );
//! Start a note with the given frequency and amplitude.
void noteOn( StkFloat frequency, StkFloat amplitude );
//! 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:
};
inline StkFloat PercFlut :: tick( unsigned int )
{
register StkFloat temp;
temp = vibrato_.tick() * modDepth_ * 0.2;
waves_[0]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[0]);
waves_[1]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[1]);
waves_[2]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[2]);
waves_[3]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[3]);
waves_[3]->addPhaseOffset( twozero_.lastOut() );
temp = gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
twozero_.tick(temp);
waves_[2]->addPhaseOffset( temp );
temp = (1.0 - (control2_ * 0.5)) * gains_[2] * adsr_[2]->tick() * waves_[2]->tick();
temp += control2_ * 0.5 * gains_[1] * adsr_[1]->tick() * waves_[1]->tick();
temp = temp * control1_;
waves_[0]->addPhaseOffset(temp);
temp = gains_[0] * adsr_[0]->tick() * waves_[0]->tick();
lastFrame_[0] = temp * 0.5;
return lastFrame_[0];
}
inline StkFrames& PercFlut :: tick( StkFrames& frames, unsigned int channel )
{
unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
if ( channel > frames.channels() - nChannels ) {
oStream_ << "PercFlut::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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