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stk::BandedWG Class Reference

Banded waveguide modeling class. More...

#include <BandedWG.h>

Inheritance diagram for stk::BandedWG:
stk::Instrmnt stk::Stk

Public Member Functions

 BandedWG (void)
 Class constructor.
 
 ~BandedWG (void)
 Class destructor.
 
void clear (void)
 Reset and clear all internal state.
 
void setStrikePosition (StkFloat position)
 Set strike position (0.0 - 1.0).
 
void setPreset (int preset)
 Select a preset.
 
void setFrequency (StkFloat frequency)
 Set instrument parameters for a particular frequency.
 
void startBowing (StkFloat amplitude, StkFloat rate)
 Apply bow velocity/pressure to instrument with given amplitude and rate of increase.
 
void stopBowing (StkFloat rate)
 Decrease bow velocity/breath pressure with given rate of decrease.
 
void pluck (StkFloat amp)
 Pluck the instrument with given amplitude.
 
void noteOn (StkFloat frequency, StkFloat amplitude)
 Start a note with the given frequency and amplitude.
 
void noteOff (StkFloat amplitude)
 Stop a note with the given amplitude (speed of decay).
 
void controlChange (int number, StkFloat value)
 Perform the control change specified by number and value (0.0 - 128.0).
 
StkFloat tick (unsigned int channel=0)
 Compute and return one output sample.
 
StkFramestick (StkFrames &frames, unsigned int channel=0)
 Fill a channel of the StkFrames object with computed outputs.
 
- Public Member Functions inherited from stk::Instrmnt
 Instrmnt (void)
 Class constructor.
 
virtual void clear (void)
 Reset and clear all internal state (for subclasses).
 
virtual void noteOn (StkFloat frequency, StkFloat amplitude)=0
 Start a note with the given frequency and amplitude.
 
virtual void noteOff (StkFloat amplitude)=0
 Stop a note with the given amplitude (speed of decay).
 
virtual void setFrequency (StkFloat frequency)
 Set instrument parameters for a particular frequency.
 
virtual void controlChange (int number, StkFloat value)
 Perform the control change specified by number and value (0.0 - 128.0).
 
unsigned int channelsOut (void) const
 Return the number of output channels for the class.
 
const StkFrameslastFrame (void) const
 Return an StkFrames reference to the last output sample frame.
 
StkFloat lastOut (unsigned int channel=0)
 Return the specified channel value of the last computed frame.
 
virtual StkFloat tick (unsigned int channel=0)=0
 Compute one sample frame and return the specified channel value.
 
virtual StkFramestick (StkFrames &frames, unsigned int channel=0)=0
 Fill the StkFrames object with computed sample frames, starting at the specified channel.
 
- Public Member Functions inherited from stk::Stk
void ignoreSampleRateChange (bool ignore=true)
 A function to enable/disable the automatic updating of class data when the STK sample rate changes.
 

Additional Inherited Members

- Static Public Member Functions inherited from stk::Stk
static StkFloat sampleRate (void)
 Static method that returns the current STK sample rate.
 
static void setSampleRate (StkFloat rate)
 Static method that sets the STK sample rate.
 
static void clear_alertList ()
 Static method that frees memory from alertList_.
 
static std::string rawwavePath (void)
 Static method that returns the current rawwave path.
 
static void setRawwavePath (std::string path)
 Static method that sets the STK rawwave path.
 
static void swap16 (unsigned char *ptr)
 Static method that byte-swaps a 16-bit data type.
 
static void swap32 (unsigned char *ptr)
 Static method that byte-swaps a 32-bit data type.
 
static void swap64 (unsigned char *ptr)
 Static method that byte-swaps a 64-bit data type.
 
static void sleep (unsigned long milliseconds)
 Static cross-platform method to sleep for a number of milliseconds.
 
static bool inRange (StkFloat value, StkFloat min, StkFloat max)
 Static method to check whether a value is within a specified range.
 
static void handleError (const char *message, StkError::Type type)
 Static function for error reporting and handling using c-strings.
 
static void handleError (std::string message, StkError::Type type)
 Static function for error reporting and handling using c++ strings.
 
static void showWarnings (bool status)
 Toggle display of WARNING and STATUS messages.
 
static void printErrors (bool status)
 Toggle display of error messages before throwing exceptions.
 
- Static Public Attributes inherited from stk::Stk
static const StkFormat STK_SINT8
 
static const StkFormat STK_SINT16
 
static const StkFormat STK_SINT24
 
static const StkFormat STK_SINT32
 
static const StkFormat STK_FLOAT32
 
static const StkFormat STK_FLOAT64
 
- Protected Member Functions inherited from stk::Stk
 Stk (void)
 Default constructor.
 
virtual ~Stk (void)
 Class destructor.
 
virtual void sampleRateChanged (StkFloat newRate, StkFloat oldRate)
 This function should be implemented in subclasses that depend on the sample rate.
 
void addSampleRateAlert (Stk *ptr)
 Add class pointer to list for sample rate change notification.
 
void removeSampleRateAlert (Stk *ptr)
 Remove class pointer from list for sample rate change notification.
 
void handleError (StkError::Type type) const
 Internal function for error reporting that assumes message in oStream_ variable.
 

Detailed Description

Banded waveguide modeling class.

This class uses banded waveguide techniques to model a variety of sounds, including bowed bars, glasses, and bowls. For more information, see Essl, G. and Cook, P. "Banded Waveguides: Towards Physical Modelling of Bar Percussion Instruments", Proceedings of the 1999 International Computer Music Conference.

Control Change Numbers:

by Georg Essl, 1999–2004. Modified for STK 4.0 by Gary Scavone.

Member Function Documentation

◆ tick()

StkFrames & stk::BandedWG::tick ( StkFrames frames,
unsigned int  channel = 0 
)
inlinevirtual

Fill a channel of the StkFrames object with computed outputs.

The channel argument must be less than the number of channels in the StkFrames argument (the first channel is specified by 0). However, range checking is only performed if STK_DEBUG is defined during compilation, in which case an out-of-range value will trigger an StkError exception.

Implements stk::Instrmnt.

125{
126 unsigned int nChannels = lastFrame_.channels();
127#if defined(_STK_DEBUG_)
128 if ( channel > frames.channels() - nChannels ) {
129 oStream_ << "BandedWG::tick(): channel and StkFrames arguments are incompatible!";
130 handleError( StkError::FUNCTION_ARGUMENT );
131 }
132#endif
133
134 StkFloat *samples = &frames[channel];
135 unsigned int j, hop = frames.channels() - nChannels;
136 if ( nChannels == 1 ) {
137 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
138 *samples++ = tick();
139 }
140 else {
141 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
142 *samples++ = tick();
143 for ( j=1; j<nChannels; j++ )
144 *samples++ = lastFrame_[j];
145 }
146 }
147
148 return frames;
149}
StkFloat tick(unsigned int channel=0)
Compute and return one output sample.
unsigned int channels(void) const
Return the number of channels represented by the data.
Definition Stk.h:416
static void handleError(const char *message, StkError::Type type)
Static function for error reporting and handling using c-strings.

The documentation for this class was generated from the following file:

The Synthesis ToolKit in C++ (STK)
©1995--2023 Perry R. Cook and Gary P. Scavone. All Rights Reserved.