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/*
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 2008 - INRIA - Allan SIMON
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
*
*/
#define FFT842 1
#define DFFT2 0
#include <stdlib.h>
#include <math.h>
#include "fft.h"
#include "lapack.h"
#include "fft_internal.h"
void zfftma ( doubleComplex* in , int rows, int cols, doubleComplex* out)
{
int choosenAlgo = DFFT2 ;
int size = rows*cols ;
int sizeTemp = 0;
int rowsTemp = 0 ;
int colsTemp = 0 ;
int ierr = 0 ;
int isn = -1;
int i = 0;
int increment=1;
double* realIn = (double*) malloc ( sizeof (double) * (unsigned int) size );
double* imagIn = (double*) malloc ( sizeof (double) * (unsigned int) size );
doubleComplex* inCopy = (doubleComplex*) malloc ( sizeof (doubleComplex) * (unsigned int) size);
doubleComplex* inTemp = (doubleComplex*) malloc ( sizeof (doubleComplex) * (unsigned int) size );
zimaga ( in , size , imagIn) ;
zreala ( in , size , realIn) ;
for(i=0;i<size;i++) inCopy[i]=in[i];
if ( rows == 1 || cols == 1 )
{
sizeTemp = (int) pow(2.0, (int) (log(size + 0.5) / log(2.0)));
if ( size == sizeTemp )
{
if ( size <= pow(2.0, 15.0))
{
fft842 ( inCopy , size , 0 );
choosenAlgo = FFT842 ;
}
else
{
dfft2 ( realIn , imagIn , 1 , size , 1 , isn , ierr );
}
}
else
{
dfft2 ( realIn , imagIn , 1 , size , 1 , isn , ierr );
}
}
else
{
rowsTemp = (int) pow(2.0, (int)(log(rows + 0.5) / log(2.0))) ;
colsTemp = (int) pow(2.0 ,(int)(log(cols + 0.5) / log(2.0))) ;
if ( rows == rowsTemp)
{
if ( rows <= pow(2.0, 15.0))
{
for ( i = 0 ; i < cols ; i++ )
{
fft842 ( &inCopy[ rows*i] , rows , 0);
/* stock new inCopy in realIn and imagIn
if the second call don't call fft842
ex : matrix 2*3 */
zimaga ( inCopy , size , imagIn) ;
zreala ( inCopy , size , realIn) ;
}
}
else
{
dfft2 ( realIn, imagIn ,cols , rows , 1 , isn , ierr);
/* stock new realIn and imagIn in inCopy
if the second call call fft842
ex : matrix 3*2 */
inCopy=DoubleComplexMatrix(realIn,imagIn,size);
}
}
else
{
dfft2 ( realIn, imagIn ,cols , rows , 1 , isn , ierr);
/* stock new realIn and imagIn in inCopy
if the second call call fft842
ex : matrix 3*2 */
inCopy=DoubleComplexMatrix(realIn,imagIn,size);
}
/*second call*/
if ( colsTemp == cols )
{
if ( cols <= pow(2.0, 15.0) )
{
/*compute the fft on each line of the matrix */
for (i = 0 ; i < rows ; i++ )
{
C2F(zcopy) ( &cols, inCopy + i, &rows, inTemp , &increment );
fft842( inTemp , cols , 0);
choosenAlgo = FFT842 ;
C2F(zcopy) ( &cols, inTemp , &increment, inCopy + i, &rows );
}
}
else
{
dfft2 ( realIn, imagIn, 1, cols, rows, isn, ierr);
}
}
else
{
dfft2 ( realIn, imagIn, 1, cols, rows, isn, ierr);
}
}
if ( choosenAlgo == FFT842 )
{
for ( i = 0 ; i < size ; i++)
{
out[i] = DoubleComplex ( zreals(inCopy[i]) , zimags(inCopy[i]) );
}
}
else
{
for ( i = 0 ; i < size ; i++)
{
out[i] = DoubleComplex ( realIn[i] , imagIn[i] );
}
}
free(realIn);
free(imagIn);
free(inCopy);
free(inTemp);
}
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