annotate Source/FFTW.h @ 1:e86e9c111b29

Updates stuff that potentially fixes the memory leak and also makes it work on Windows and Linux (Need to test). Still have to fix fftw include for linux in Jucer.

//----------------------------------------------------------------------------------------------------------------------
/**
 \author André Bergner
 \date   Feb/2013

 \class FFTW

 Encapsulates the FFT of lib-fftw

 (c) Copyright NATIVE INSTRUMENTS, Berlin, Germany
 ALL RIGHTS RESERVED
 */
//----------------------------------------------------------------------------------------------------------------------

#pragma once

#include "fftw3.h"
#include <vector>
#include <stdio.h>
//#include <windows.h>
#include <string.h>
//#include <itl/dsp/SimdTools.h>



class FFTW
{

public:
   fftwf_plan  m_plan;
  unsigned m_iFFTSize;

  FFTW();
  FFTW( unsigned fftLength )
  {
	m_iFFTSize = fftLength;

    float* tempInput = new float[fftLength];
	memset(tempInput,0, fftLength * sizeof(float));
    float* tempReal  = new float[fftLength];
	memset(tempReal,0, fftLength * sizeof(float));
    float* tempImag  = new float[fftLength];
	memset(tempImag,0, fftLength * sizeof(float));
    fftwf_iodim  dim;
    dim.n =  fftLength;
    dim.is = 1;
    dim.os = 1;
    m_plan = fftwf_plan_guru_split_dft_r2c( 1, &dim, 0, NULL, tempInput, tempReal, tempImag, FFTW_ESTIMATE );
	delete[] tempInput;
	tempInput = nullptr;
	delete[] tempReal;
	tempReal = nullptr;
	delete[] tempImag;
	tempImag = nullptr;
  }


 ~FFTW()
  {
	  if(m_plan != NULL)
	  {
			fftwf_destroy_plan( m_plan );
	  }
  }


  void process( const float* input , float* realPart , float* imagPart )
  {
	float* nonConstInput =  const_cast<float*>(input);   // fftw does not take const input even though the data not be manipulated!

	fftwf_execute_split_dft_r2c( m_plan, nonConstInput, realPart, imagPart);

	//Multiply results by 2 to match the iOS output
	for(size_t i = 0; i < m_iFFTSize; i++)
	{
		realPart[i] *= 2.f;
		imagPart[i] *= 2.f;
	}
  }

};