/*******************************************/
/*
   Linearly Interpolating Delay Line
   Object by Perry R. Cook 1995-96.
   Added methods by Julius Smith, 2000.

   This one uses a delay line of maximum
   length specified on creation, and
   linearly interpolates fractional
   length.  It is designed to be more
   efficient if the delay length is not
   changed very often.
*/
/*******************************************/

#if !defined(__DLineL_h)
#define __DLineL_h

#include "Filter.h"

class DLineL : public Filter
{
 protected:  
  long inPoint;
  long outPoint;
  long length;
  MY_FLOAT alpha;
  MY_FLOAT omAlpha;
  MY_FLOAT currentDelay;
 public:
  DLineL();
  DLineL(long max_length);
  ~DLineL();
  void clear();
  void setDelay(MY_FLOAT length);
  MY_FLOAT delay(void);
  MY_FLOAT energy(void);
  long currentInPoint(void);
  long currentOutPoint(void);
  MY_FLOAT contentsAt(int n);
  MY_FLOAT contentsAtNowMinus(int n);
  MY_FLOAT tick(MY_FLOAT sample);
};

#endif