Drummer.h

#ifndef STK_DRUMMER_H
#define STK_DRUMMER_H
 
#include "Instrmnt.h"
#include "FileWvIn.h"
#include "MemoryWvIn.h"
#include "OnePole.h"
 
namespace stk {
 
/***************************************************/
/***************************************************/
 
const int DRUM_NUMWAVES = 11;
const int DRUM_POLYPHONY = 4;
 
class Drummer : public Instrmnt
{
 public:
 
  Drummer( void );
 
  ~Drummer( void );
 
 
  void noteOn( StkFloat instrument, StkFloat amplitude );
 
  void noteOff( StkFloat amplitude );
 
  StkFloat tick( unsigned int channel = 0 );
 
 
  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
 
 protected:
  FileWvIn waves_[DRUM_POLYPHONY];
  OnePole  filters_[DRUM_POLYPHONY];
  std::vector<int> soundOrder_;
  std::vector<int> soundNumber_;
  int      nSounding_;
};
 
inline StkFloat Drummer :: tick( unsigned int )
{
  lastFrame_[0] = 0.0;
  if ( nSounding_ == 0 ) return lastFrame_[0];
 
  for ( int i=0; i<DRUM_POLYPHONY; i++ ) {
    if ( soundOrder_[i] >= 0 ) {
      if ( waves_[i].isFinished() ) {
        // Re-order the list.
        for ( int j=0; j<DRUM_POLYPHONY; j++ ) {
          if ( soundOrder_[j] > soundOrder_[i] )
            soundOrder_[j] -= 1;
        }
        soundOrder_[i] = -1;
        nSounding_--;
      }
      else
        lastFrame_[0] += filters_[i].tick( waves_[i].tick() );
    }
  }
 
  return lastFrame_[0];
}
 
inline StkFrames& Drummer :: tick( StkFrames& frames, unsigned int channel )
{
  unsigned int nChannels = lastFrame_.channels();
#if defined(_STK_DEBUG_)
  if ( channel > frames.channels() - nChannels ) {
    oStream_ << "Drummer::tick(): channel and StkFrames arguments are incompatible!";
    handleError( StkError::FUNCTION_ARGUMENT );
  }
#endif
 
  StkFloat *samples = &frames[channel];
  unsigned int j, hop = frames.channels() - nChannels;
  if ( nChannels == 1 ) {
    for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
      *samples++ = tick();
  }
  else {
    for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
      *samples++ = tick();
      for ( j=1; j<nChannels; j++ )
        *samples++ = lastFrame_[j];
    }
  }
 
  return frames;
}
 
 
} // stk namespace
 
#endif