FScrunch.h

//-*-C++-*-
/***************************************************************************
 *
 *   Copyright (C) 2010 by Willem van Straten
 *   Licensed under the Academic Free License version 2.1
 *
 ***************************************************************************/
 
#ifndef __FScrunch_h
#define __FScrunch_h
 
#include "dsp/Transformation.h"
#include "dsp/TimeSeries.h"
 
namespace dsp {
 
  class FScrunch : public Transformation <TimeSeries, TimeSeries>
  {
 
  public:
 
    FScrunch (Behaviour place=anyplace);
    
    void set_factor ( unsigned samples );
    unsigned get_factor () const;
 
    void set_frequency_resolution ( double Megahertz );
    double get_frequency_resolution () const;
 
    class Engine;
 
    void set_engine (Engine*);
    
  protected:
 
    void transformation ();
    void tfp_fscrunch ();
    void fpt_fscrunch ();
 
    mutable unsigned factor;
    mutable double frequency_resolution;
 
    // if true, use the frequency_resolution parameter
    // if false, use the factor parameter
    mutable bool use_fres; 
 
    unsigned sfactor;
    uint64_t output_nchan;
 
    Reference::To<Engine> engine;
  };
 
  class FScrunch::Engine : public OwnStream
  {
  public:
 
    virtual void fpt_fscrunch (const dsp::TimeSeries * in, 
                         dsp::TimeSeries * out,
                         unsigned sfactor) = 0;
 
  };
 
}
 
#endif // !defined(__FScrunch_h)