/*
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*/
// A simple example of performing the forward FFT for processing complex data.
// implemented with Intel(R) Integrated Primitives (Intel(R) IPP) functions:
// ippiFFTGetSize_C_32fc
// ippiFFTInit_C_32fc
// ippiFFTFwd_CToC_32fc_C1R
// ippiFFTInv_CToC_32fc_C1R
#include <stdio.h>
#include "ipp.h"
/* Next two defines are created to simplify code reading and understanding */
#define EXIT_MAIN exitLine: /* Label for Exit */
#define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) IPP function returned status different from ippStsNoErr */
/* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */
int main(void)
{
IppStatus status;
IppiFFTSpec_C_32fc *pSpec = NULL; /* Pointer to FFT spec structure */
/* Pointers to source/destination images */
Ipp32fc pSrcFwd[64] = {0}, pDstFwd[64] = {0};
Ipp32fc pSrcInv[64] = {0}, pDstInv[64] = {0};
Ipp32fc m3 = {-3, 0}, one = {1, 0};
Ipp8u *pMemInit = NULL, *pBuffer = NULL; /* Pointer to the work buffers */
int sizeSpec = 0, sizeInit = 0, sizeBuf = 0; /* size of FFT spec structure, Init and work buffers */
pSrcFwd[0] = m3; pSrcFwd[9] = one;
check_sts( status = ippiFFTGetSize_C_32fc( 3, 3, IPP_FFT_DIV_INV_BY_N, ippAlgHintAccurate,
&sizeSpec, &sizeInit, &sizeBuf ) )
/* memory allocation */
pSpec = (IppiFFTSpec_C_32fc*) ippMalloc( sizeSpec );
pBuffer = (Ipp8u*) ippMalloc( sizeBuf );
pMemInit = (Ipp8u*) ippMalloc( sizeInit );
check_sts( status = ippiFFTInit_C_32fc( 3, 3, IPP_FFT_DIV_INV_BY_N, ippAlgHintAccurate, pSpec, pMemInit ) )
/* forward FFT transform */
check_sts( status = ippiFFTFwd_CToC_32fc_C1R( pSrcFwd, 8*sizeof(Ipp32fc),
pDstFwd, 8*sizeof(Ipp32fc), pSpec, pBuffer ) )
check_sts( status = ippsCopy_32fc( pDstFwd, pSrcInv, 64 ) )
/* inverse FFT transform */
check_sts( status = ippiFFTInv_CToC_32fc_C1R( pSrcInv, 8*sizeof(Ipp32fc),
pDstInv, 8*sizeof(Ipp32fc), pSpec, pBuffer ) )
EXIT_MAIN
ippFree( pMemInit );
ippFree( pSpec );
ippFree( pBuffer );
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
}