/usr/include/stk/Brass.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | #ifndef STK_BRASS_H
#define STK_BRASS_H
#include "Instrmnt.h"
#include "DelayA.h"
#include "BiQuad.h"
#include "PoleZero.h"
#include "ADSR.h"
#include "SineWave.h"
namespace stk {
/***************************************************/
/*! \class Brass
\brief STK simple brass instrument class.
This class implements a simple brass instrument
waveguide model, a la Cook (TBone, HosePlayer).
This is a digital waveguide model, making its
use possibly subject to patents held by
Stanford University, Yamaha, and others.
Control Change Numbers:
- Lip Tension = 2
- Slide Length = 4
- Vibrato Frequency = 11
- Vibrato Gain = 1
- Volume = 128
by Perry R. Cook and Gary P. Scavone, 1995-2011.
*/
/***************************************************/
class Brass: public Instrmnt
{
public:
//! Class constructor, taking the lowest desired playing frequency.
/*!
An StkError will be thrown if the rawwave path is incorrectly set.
*/
Brass( StkFloat lowestFrequency = 8.0 );
//! Class destructor.
~Brass( );
//! Reset and clear all internal state.
void clear( );
//! Set instrument parameters for a particular frequency.
void setFrequency( StkFloat frequency );
//! Set the lips frequency.
void setLip( StkFloat frequency );
//! Apply breath pressure to instrument with given amplitude and rate of increase.
void startBlowing( StkFloat amplitude, StkFloat rate );
//! Decrease breath pressure with given rate of decrease.
void stopBlowing( StkFloat rate );
//! 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:
DelayA delayLine_;
BiQuad lipFilter_;
PoleZero dcBlock_;
ADSR adsr_;
SineWave vibrato_;
StkFloat lipTarget_;
StkFloat slideTarget_;
StkFloat vibratoGain_;
StkFloat maxPressure_;
};
inline StkFloat Brass :: tick( unsigned int )
{
StkFloat breathPressure = maxPressure_ * adsr_.tick();
breathPressure += vibratoGain_ * vibrato_.tick();
StkFloat mouthPressure = 0.3 * breathPressure;
StkFloat borePressure = 0.85 * delayLine_.lastOut();
StkFloat deltaPressure = mouthPressure - borePressure; // Differential pressure.
deltaPressure = lipFilter_.tick( deltaPressure ); // Force - > position.
deltaPressure *= deltaPressure; // Basic position to area mapping.
if ( deltaPressure > 1.0 ) deltaPressure = 1.0; // Non-linear saturation.
// The following input scattering assumes the mouthPressure = area.
lastFrame_[0] = deltaPressure * mouthPressure + ( 1.0 - deltaPressure) * borePressure;
lastFrame_[0] = delayLine_.tick( dcBlock_.tick( lastFrame_[0] ) );
return lastFrame_[0];
}
inline StkFrames& Brass :: tick( StkFrames& frames, unsigned int channel )
{
unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
if ( channel > frames.channels() - nChannels ) {
oStream_ << "Brass::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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