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Flute.h
1 #ifndef STK_FLUTE_H
2 #define STK_FLUTE_H
3
4 #include "Instrmnt.h"
5 #include "JetTable.h"
6 #include "DelayL.h"
7 #include "OnePole.h"
8 #include "PoleZero.h"
9 #include "Noise.h"
10 #include "ADSR.h"
11 #include "SineWave.h"
12
13 namespace stk {
14
15 /***************************************************/
37 /***************************************************/
38
39 class Flute : public Instrmnt
40 {
41 public:
43
46 Flute( StkFloat lowestFrequency );
47
49 ~Flute( void );
50
52 void clear( void );
53
55 void setFrequency( StkFloat frequency );
56
58 void setJetReflection( StkFloat coefficient ) { jetReflection_ = coefficient; };
59
61 void setEndReflection( StkFloat coefficient ) { endReflection_ = coefficient; };
62
64 void setJetDelay( StkFloat aRatio );
65
67 void startBlowing( StkFloat amplitude, StkFloat rate );
68
70 void stopBlowing( StkFloat rate );
71
73 void noteOn( StkFloat frequency, StkFloat amplitude );
74
76 void noteOff( StkFloat amplitude );
77
79 void controlChange( int number, StkFloat value );
80
82 StkFloat tick( unsigned int channel = 0 );
83
85
92 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
93
94 protected:
95
96 DelayL jetDelay_;
97 DelayL boreDelay_;
98 JetTable jetTable_;
99 OnePole filter_;
100 PoleZero dcBlock_;
101 Noise noise_;
102 ADSR adsr_;
103 SineWave vibrato_;
104
105 StkFloat lastFrequency_;
106 StkFloat maxPressure_;
107 StkFloat jetReflection_;
108 StkFloat endReflection_;
109 StkFloat noiseGain_;
110 StkFloat vibratoGain_;
111 StkFloat outputGain_;
112 StkFloat jetRatio_;
113
114 };
115
116 inline StkFloat Flute :: tick( unsigned int )
117 {
118 StkFloat pressureDiff;
119 StkFloat breathPressure;
120
121 // Calculate the breath pressure (envelope + noise + vibrato)
122 breathPressure = maxPressure_ * adsr_.tick();
123 breathPressure += breathPressure * ( noiseGain_ * noise_.tick() + vibratoGain_ * vibrato_.tick() );
124
125 StkFloat temp = -filter_.tick( boreDelay_.lastOut() );
126 temp = dcBlock_.tick( temp ); // Block DC on reflection.
127
128 pressureDiff = breathPressure - (jetReflection_ * temp);
129 pressureDiff = jetDelay_.tick( pressureDiff );
130 pressureDiff = jetTable_.tick( pressureDiff ) + (endReflection_ * temp);
131 lastFrame_[0] = (StkFloat) 0.3 * boreDelay_.tick( pressureDiff );
132
133 lastFrame_[0] *= outputGain_;
134 return lastFrame_[0];
135 }
136
137 inline StkFrames& Flute :: tick( StkFrames& frames, unsigned int channel )
138 {
139 unsigned int nChannels = lastFrame_.channels();
140 #if defined(_STK_DEBUG_)
141 if ( channel > frames.channels() - nChannels ) {
142 oStream_ << "Flute::tick(): channel and StkFrames arguments are incompatible!";
143 handleError( StkError::FUNCTION_ARGUMENT );
144 }
145 #endif
146
147 StkFloat *samples = &frames[channel];
148 unsigned int j, hop = frames.channels() - nChannels;
149 if ( nChannels == 1 ) {
150 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
151 *samples++ = tick();
152 }
153 else {
154 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
155 *samples++ = tick();
156 for ( j=1; j<nChannels; j++ )
157 *samples++ = lastFrame_[j];
158 }
159 }
160
161 return frames;
162 }
163
164 } // stk namespace
165
166 #endif

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