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Noise.h
1 #ifndef STK_NOISE_H
2 #define STK_NOISE_H
3 
4 #include "Generator.h"
5 #include <stdlib.h>
6 
7 namespace stk {
8 
9 /***************************************************/
19 /***************************************************/
20 
21 class Noise : public Generator
22 {
23 public:
24 
26 
30  Noise( unsigned int seed = 0 );
31 
33 
37  void setSeed( unsigned int seed = 0 );
38 
40  StkFloat lastOut( void ) const { return lastFrame_[0]; };
41 
43  StkFloat tick( void );
44 
46 
53  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
54 
55 protected:
56 
57 };
58 
59 inline StkFloat Noise :: tick( void )
60 {
61  return lastFrame_[0] = (StkFloat) ( 2.0 * rand() / (RAND_MAX + 1.0) - 1.0 );
62 }
63 
64 inline StkFrames& Noise :: tick( StkFrames& frames, unsigned int channel )
65 {
66 #if defined(_STK_DEBUG_)
67  if ( channel >= frames.channels() ) {
68  oStream_ << "Noise::tick(): channel and StkFrames arguments are incompatible!";
69  handleError( StkError::FUNCTION_ARGUMENT );
70  }
71 #endif
72 
73  StkFloat *samples = &frames[channel];
74  unsigned int hop = frames.channels();
75  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
76  *samples = (StkFloat) ( 2.0 * rand() / (RAND_MAX + 1.0) - 1.0 );
77 
78  lastFrame_[0] = *(samples-hop);
79  return frames;
80 }
81 
82 } // stk namespace
83 
84 #endif

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