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ReedTable.h
1#ifndef STK_REEDTABLE_H
2#define STK_REEDTABLE_H
3
4#include "Function.h"
5
6 namespace stk {
7
8/***************************************************/
25/***************************************************/
26
27 class ReedTable : public Function
28{
29 public:
31 ReedTable( void ) : offset_(0.6), slope_(-0.8) {};
32
34
39 void setOffset( StkFloat offset ) { offset_ = offset; };
40
42
47 void setSlope( StkFloat slope ) { slope_ = slope; };
48
50 StkFloat tick( StkFloat input );
51
53
61 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
62
64
72 StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
73
74 protected:
75
76 StkFloat offset_;
77 StkFloat slope_;
78
79};
80
81 inline StkFloat ReedTable :: tick( StkFloat input )
82{
83 // The input is differential pressure across the reed.
84 lastFrame_[0] = offset_ + (slope_ * input);
85
86 // If output is > 1, the reed has slammed shut and the
87 // reflection function value saturates at 1.0.
88 if ( lastFrame_[0] > 1.0) lastFrame_[0] = (StkFloat) 1.0;
89
90 // This is nearly impossible in a physical system, but
91 // a reflection function value of -1.0 corresponds to
92 // an open end (and no discontinuity in bore profile).
93 if ( lastFrame_[0] < -1.0) lastFrame_[0] = (StkFloat) -1.0;
94
95 return lastFrame_[0];
96}
97
98 inline StkFrames& ReedTable :: tick( StkFrames& frames, unsigned int channel )
99{
100#if defined(_STK_DEBUG_)
101 if ( channel >= frames.channels() ) {
102 oStream_ << "ReedTable::tick(): channel and StkFrames arguments are incompatible!";
103 handleError( StkError::FUNCTION_ARGUMENT );
104 }
105#endif
106
107 StkFloat *samples = &frames[channel];
108 unsigned int hop = frames.channels();
109 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
110 *samples = offset_ + (slope_ * *samples);
111 if ( *samples > 1.0) *samples = 1.0;
112 if ( *samples < -1.0) *samples = -1.0;
113 }
114
115 lastFrame_[0] = *(samples-hop);
116 return frames;
117}
118
119 inline StkFrames& ReedTable :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
120{
121#if defined(_STK_DEBUG_)
122 if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
123 oStream_ << "ReedTable::tick(): channel and StkFrames arguments are incompatible!";
124 handleError( StkError::FUNCTION_ARGUMENT );
125 }
126#endif
127
128 StkFloat *iSamples = &iFrames[iChannel];
129 StkFloat *oSamples = &oFrames[oChannel];
130 unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
131 for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
132 *oSamples = offset_ + (slope_ * *iSamples);
133 if ( *oSamples > 1.0) *oSamples = 1.0;
134 if ( *oSamples < -1.0) *oSamples = -1.0;
135 }
136
137 lastFrame_[0] = *(oSamples-oHop);
138 return iFrames;
139}
140
141} // stk namespace
142
143#endif
stk::Function::Function
Function(void)
Class constructor.
Definition Function.h:24
stk::ReedTable::ReedTable
ReedTable(void)
Default constructor.
Definition ReedTable.h:31
stk::ReedTable::tick
StkFloat tick(StkFloat input)
Take one sample input and map to one sample of output.
Definition ReedTable.h:81
stk::ReedTable::setSlope
void setSlope(StkFloat slope)
Set the table slope value.
Definition ReedTable.h:47
stk::ReedTable::setOffset
void setOffset(StkFloat offset)
Set the table offset value.
Definition ReedTable.h:39
stk::StkFrames
An STK class to handle vectorized audio data.
Definition Stk.h:279
stk::StkFrames::channels
unsigned int channels(void) const
Return the number of channels represented by the data.
Definition Stk.h:416
stk::StkFrames::frames
unsigned int frames(void) const
Return the number of sample frames represented by the data.
Definition Stk.h:419
stk::Stk::handleError
static void handleError(const char *message, StkError::Type type)
Static function for error reporting and handling using c-strings.
stk
The STK namespace.
Definition ADSR.h:6

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