 
////////////////////////////////////////////////////////////////////////
// This file is part of the SndObj library
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
//
// Copyright (c)Victor Lazzarini, 1997-2004
// See License.txt for a disclaimer of all warranties
// and licensing information

//////////////////////////////////////////////////////
// IFFT.h: interface of the IFFT class: 
//        short-time inverse fast fourier transform
//        using the FFTW library (v. 2.1.3) 
//        Victor Lazzarini, 2003 
/////////////////////////////////////////////////////////

#ifndef _IFFT_H
#define _IFFT_H
#include <rfftw.h>
#include "Table.h"
#include "SndObj.h"

class IFFT : public SndObj {

 protected:

  // m_vecsize is hopsize
  // and fftsize is always a whole-number
  // multiple of it.

  int m_fftsize;
  int m_hopsize;  // hopsize
  int m_halfsize; // 1/2 fftsize
  int *m_counter; // counter 
  rfftw_plan m_plan; // FFTW initialisation
  float m_fund;

  int m_frames;  // frame overlaps
  float** m_sigframe; // signal frames
  float* m_ffttmp; // tmp vector for fft transform
  int m_cur;    // index into current frame 

  Table*  m_table; // window

  // reset memory and initialisation
  void ReInit();

 private:
  // ifft wrapper method
  void inline ifft(float* signal);



 public:

  IFFT();
  IFFT(Table* window, SndObj* input, int fftsize = DEF_FFTSIZE, 
       int hopsize=DEF_VECSIZE, float sr=DEF_SR);
  ~IFFT();


  int GetFFTSize() { return m_fftsize; }
  int GetHopSize() { return m_hopsize; }
  void SetWindow(Table* window){ m_table = window;}
  int Connect(char* mess, void* input);
  int Set(char* mess, float value);
  virtual void SetFFTSize(int fftsize);
  virtual void SetHopSize(int hopsize);

  short DoProcess();


};

#endif
