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Drummer.h
1 #ifndef STK_DRUMMER_H
2 #define STK_DRUMMER_H
3 
4 #include "Instrmnt.h"
5 #include "FileWvIn.h"
6 #include "OnePole.h"
7 
8 namespace stk {
9 
10 /***************************************************/
25 /***************************************************/
26 
27 const int DRUM_NUMWAVES = 11;
28 const int DRUM_POLYPHONY = 4;
29 
30 class Drummer : public Instrmnt
31 {
32  public:
34 
37  Drummer( void );
38 
40  ~Drummer( void );
41 
43 
49  void noteOn( StkFloat instrument, StkFloat amplitude );
50 
52  void noteOff( StkFloat amplitude );
53 
55  StkFloat tick( unsigned int channel = 0 );
56 
58 
65  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
66 
67  protected:
68 
69  FileWvIn waves_[DRUM_POLYPHONY];
70  OnePole filters_[DRUM_POLYPHONY];
71  std::vector<int> soundOrder_;
72  std::vector<int> soundNumber_;
73  int nSounding_;
74 };
75 
76 inline StkFloat Drummer :: tick( unsigned int )
77 {
78  lastFrame_[0] = 0.0;
79  if ( nSounding_ == 0 ) return lastFrame_[0];
80 
81  for ( int i=0; i<DRUM_POLYPHONY; i++ ) {
82  if ( soundOrder_[i] >= 0 ) {
83  if ( waves_[i].isFinished() ) {
84  // Re-order the list.
85  for ( int j=0; j<DRUM_POLYPHONY; j++ ) {
86  if ( soundOrder_[j] > soundOrder_[i] )
87  soundOrder_[j] -= 1;
88  }
89  soundOrder_[i] = -1;
90  nSounding_--;
91  }
92  else
93  lastFrame_[0] += filters_[i].tick( waves_[i].tick() );
94  }
95  }
96 
97  return lastFrame_[0];
98 }
99 
100 inline StkFrames& Drummer :: tick( StkFrames& frames, unsigned int channel )
101 {
102  unsigned int nChannels = lastFrame_.channels();
103 #if defined(_STK_DEBUG_)
104  if ( channel > frames.channels() - nChannels ) {
105  oStream_ << "Drummer::tick(): channel and StkFrames arguments are incompatible!";
106  handleError( StkError::FUNCTION_ARGUMENT );
107  }
108 #endif
109 
110  StkFloat *samples = &frames[channel];
111  unsigned int j, hop = frames.channels() - nChannels;
112  if ( nChannels == 1 ) {
113  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
114  *samples++ = tick();
115  }
116  else {
117  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
118  *samples++ = tick();
119  for ( j=1; j<nChannels; j++ )
120  *samples++ = lastFrame_[j];
121  }
122  }
123 
124  return frames;
125 }
126 
127 
128 } // stk namespace
129 
130 #endif

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