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BlowBotl.h
1 #ifndef STK_BLOWBOTL_H
2 #define STK_BLOWBOTL_H
3 
4 #include "Instrmnt.h"
5 #include "JetTable.h"
6 #include "BiQuad.h"
7 #include "PoleZero.h"
8 #include "Noise.h"
9 #include "ADSR.h"
10 #include "SineWave.h"
11 
12 namespace stk {
13 
14 /***************************************************/
30 /***************************************************/
31 
32 class BlowBotl : public Instrmnt
33 {
34  public:
36 
39  BlowBotl( void );
40 
42  ~BlowBotl( void );
43 
45  void clear( void );
46 
48  void setFrequency( StkFloat frequency );
49 
51  void startBlowing( StkFloat amplitude, StkFloat rate );
52 
54  void stopBlowing( StkFloat rate );
55 
57  void noteOn( StkFloat frequency, StkFloat amplitude );
58 
60  void noteOff( StkFloat amplitude );
61 
63  void controlChange( int number, StkFloat value );
64 
66  StkFloat tick( unsigned int channel = 0 );
67 
69 
76  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
77 
78  protected:
79 
80  JetTable jetTable_;
81  BiQuad resonator_;
82  PoleZero dcBlock_;
83  Noise noise_;
84  ADSR adsr_;
85  SineWave vibrato_;
86  StkFloat maxPressure_;
87  StkFloat noiseGain_;
88  StkFloat vibratoGain_;
89  StkFloat outputGain_;
90 
91 };
92 
93 inline StkFloat BlowBotl :: tick( unsigned int )
94 {
95  StkFloat breathPressure;
96  StkFloat randPressure;
97  StkFloat pressureDiff;
98 
99  // Calculate the breath pressure (envelope + vibrato)
100  breathPressure = maxPressure_ * adsr_.tick();
101  breathPressure += vibratoGain_ * vibrato_.tick();
102 
103  pressureDiff = breathPressure - resonator_.lastOut();
104 
105  randPressure = noiseGain_ * noise_.tick();
106  randPressure *= breathPressure;
107  randPressure *= (1.0 + pressureDiff);
108 
109  resonator_.tick( breathPressure + randPressure - ( jetTable_.tick( pressureDiff ) * pressureDiff ) );
110  lastFrame_[0] = 0.2 * outputGain_ * dcBlock_.tick( pressureDiff );
111 
112  return lastFrame_[0];
113 }
114 
115 inline StkFrames& BlowBotl :: tick( StkFrames& frames, unsigned int channel )
116 {
117  unsigned int nChannels = lastFrame_.channels();
118 #if defined(_STK_DEBUG_)
119  if ( channel > frames.channels() - nChannels ) {
120  oStream_ << "BlowBotl::tick(): channel and StkFrames arguments are incompatible!";
121  handleError( StkError::FUNCTION_ARGUMENT );
122  }
123 #endif
124 
125  StkFloat *samples = &frames[channel];
126  unsigned int j, hop = frames.channels() - nChannels;
127  if ( nChannels == 1 ) {
128  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
129  *samples++ = tick();
130  }
131  else {
132  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
133  *samples++ = tick();
134  for ( j=1; j<nChannels; j++ )
135  *samples++ = lastFrame_[j];
136  }
137  }
138 
139  return frames;
140 }
141 
142 } // stk namespace
143 
144 #endif

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