/*
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*/
// A simple example of performing the forward FFT for processing real data
// for CCS packed formats and computing magnitude
// implemented with Intel(R) Integrated Primitives (Intel(R) IPP) functions:
// ippiFFTGetSize_R_32f
// ippiFFTInit_R_32f
// ippiFFTFwd_RToPack_32f_C1R
// ippsMagnitude_32fc
#include <stdio.h>
#include <math.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)
{
int i;
IppStatus status = ippStsNoErr;
Ipp32f pSrc[8], pDst[10]; /* Pointers to source/destination images */
Ipp32f pMagn[4]; /* Pointer to the computed magnitude values */
IppsFFTSpec_R_32f* pSpec = NULL; /* Pointer to FFT pSpec structure */
Ipp8u *pMemInit = NULL, *pBuffer = NULL, *pSpecMem = NULL; /* Pointer to the work buffers */
int sizeSpec = 0, sizeInit = 0, sizeBuf = 0; /* size of FFT pSpec structure, Init and work buffers */
check_sts( status = ippsFFTGetSize_R_32f(3, IPP_FFT_DIV_INV_BY_N, ippAlgHintNone, &sizeSpec, &sizeInit, &sizeBuf) )
/* memory allocation */
pSpecMem = (Ipp8u*) ippMalloc( sizeSpec );
pBuffer = (Ipp8u*) ippMalloc( sizeBuf );
pMemInit = (Ipp8u*) ippMalloc( sizeInit );
check_sts( status = ippsFFTInit_R_32f(&pSpec, 3, IPP_FFT_DIV_INV_BY_N, ippAlgHintNone, pSpecMem, pMemInit) )
for (i = 0; i< 8 ; ++i)
{
pSrc[i] = (float)cos(IPP_2PI * i * 16.0/64);
}
check_sts( status = ippsFFTFwd_RToCCS_32f( pSrc, pDst, pSpec, NULL ) )
check_sts( status = ippsMagnitude_32fc( (Ipp32fc*)pDst, pMagn, 4 ) )
printf("FFT Magnitude = %f %f %f %f\n", pMagn[0], pMagn[1], pMagn[2], pMagn[3]);
EXIT_MAIN
ippFree( pMemInit );
ippFree( pSpec );
ippFree( pBuffer );
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
}