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stk::Drummer Class Reference

STK drum sample player class. More...

#include <Drummer.h>

Inheritance diagram for stk::Drummer:
stk::Instrmnt stk::Stk

Public Member Functions

 Drummer (void)
 Class constructor. More...
 
 ~Drummer (void)
 Class destructor.
 
void noteOn (StkFloat instrument, StkFloat amplitude)
 Start a note with the given drum type and amplitude. More...
 
void noteOff (StkFloat amplitude)
 Stop a note with the given amplitude (speed of decay).
 
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. More...
 
- Public Member Functions inherited from stk::Instrmnt
 Instrmnt (void)
 Class constructor.
 
virtual void clear (void)
 Reset and clear all internal state (for subclasses). More...
 
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. More...
 
- 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. More...
 

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. More...
 
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

STK drum sample player class.

This class implements a drum sampling synthesizer using WvIn objects and one-pole filters. The drum rawwave files are sampled at 22050 Hz, but will be appropriately interpolated for other sample rates. You can specify the maximum polyphony (maximum number of simultaneous voices) via a #define in the Drummer.h.

by Perry R. Cook and Gary P. Scavone, 1995–2014.

Constructor & Destructor Documentation

stk::Drummer::Drummer ( void  )

Class constructor.

An StkError will be thrown if the rawwave path is incorrectly set.

Member Function Documentation

void stk::Drummer::noteOn ( StkFloat  instrument,
StkFloat  amplitude 
)
virtual

Start a note with the given drum type and amplitude.

Use general MIDI drum instrument numbers, converted to frequency values as if MIDI note numbers, to select a particular instrument. An StkError will be thrown if the rawwave path is incorrectly set.

Implements stk::Instrmnt.

StkFrames & stk::Drummer::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.

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 }

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

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