Home   Information   Classes   Download   Usage   Mail List   Requirements   Links   FAQ   Tutorial


OneZero.h
1 #ifndef STK_ONEZERO_H
2 #define STK_ONEZERO_H
3 
4 #include "Filter.h"
5 
6 namespace stk {
7 
8 /***************************************************/
18 /***************************************************/
19 
20 class OneZero : public Filter
21 {
22  public:
23 
25  OneZero( StkFloat theZero = -1.0 );
26 
28  ~OneZero();
29 
31  void setB0( StkFloat b0 ) { b_[0] = b0; };
32 
34  void setB1( StkFloat b1 ) { b_[1] = b1; };
35 
37  void setCoefficients( StkFloat b0, StkFloat b1, bool clearState = false );
38 
40 
47  void setZero( StkFloat theZero );
48 
50  StkFloat lastOut( void ) const { return lastFrame_[0]; };
51 
53  StkFloat tick( StkFloat input );
54 
56 
64  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
65 
67 
75  StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
76 
77 };
78 
79 inline StkFloat OneZero :: tick( StkFloat input )
80 {
81  inputs_[0] = gain_ * input;
82  lastFrame_[0] = b_[1] * inputs_[1] + b_[0] * inputs_[0];
83  inputs_[1] = inputs_[0];
84 
85  return lastFrame_[0];
86 }
87 
88 inline StkFrames& OneZero :: tick( StkFrames& frames, unsigned int channel )
89 {
90 #if defined(_STK_DEBUG_)
91  if ( channel >= frames.channels() ) {
92  oStream_ << "OneZero::tick(): channel and StkFrames arguments are incompatible!";
93  handleError( StkError::FUNCTION_ARGUMENT );
94  }
95 #endif
96 
97  StkFloat *samples = &frames[channel];
98  unsigned int hop = frames.channels();
99  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
100  inputs_[0] = gain_ * *samples;
101  *samples = b_[1] * inputs_[1] + b_[0] * inputs_[0];
102  inputs_[1] = inputs_[0];
103  }
104 
105  lastFrame_[0] = *(samples-hop);
106  return frames;
107 }
108 
109 inline StkFrames& OneZero :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
110 {
111 #if defined(_STK_DEBUG_)
112  if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
113  oStream_ << "OneZero::tick(): channel and StkFrames arguments are incompatible!";
114  handleError( StkError::FUNCTION_ARGUMENT );
115  }
116 #endif
117 
118  StkFloat *iSamples = &iFrames[iChannel];
119  StkFloat *oSamples = &oFrames[oChannel];
120  unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
121  for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
122  inputs_[0] = gain_ * *iSamples;
123  *oSamples = b_[1] * inputs_[1] + b_[0] * inputs_[0];
124  inputs_[1] = inputs_[0];
125  }
126 
127  lastFrame_[0] = *(oSamples-oHop);
128  return iFrames;
129 }
130 
131 } // stk namespace
132 
133 #endif
134 

The Synthesis ToolKit in C++ (STK)
©1995--2014 Perry R. Cook and Gary P. Scavone. All Rights Reserved.