/*******************************************************************************
* Copyright 2015-2018 Intel Corporation.
*
* This software and the related documents are Intel copyrighted materials, and
* your use of them is governed by the express license under which they were
* provided to you (License). Unless the License provides otherwise, you may not
* use, modify, copy, publish, distribute, disclose or transmit this software or
* the related documents without Intel's prior written permission.
*
* This software and the related documents are provided as is, with no express
* or implied warranties, other than those that are expressly stated in the
* License.
*******************************************************************************/
// A simple example of performing the forward FFT for processing real data.
// implemented with Intel(R) Integrated Primitives (Intel(R) IPP) functions:
// ippiFFTGetSize_R_32f
// ippiFFTInit_R_32f
// ippiFFTFwd_RToPack_32f_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_R_32f *pSpec = NULL; /* Pointer to FFT spec structure */
/* Pointers to source/destination images */
Ipp32f pSrcFwd[64] = {0}, pDstFwd[64] = {0};
/* Pointer to the work buffers */
Ipp8u *pMemInit = NULL;
Ipp8u *pBuffer = NULL;
int sizeSpec = 0, sizeInit = 0, sizeBuf = 0; /* size of FFT spec structure, Init and work buffers */
pSrcFwd[0] = -3; pSrcFwd[9] = 1;
check_sts( status = ippiFFTGetSize_R_32f(3, 3, IPP_FFT_DIV_INV_BY_N, ippAlgHintAccurate,
&sizeSpec, &sizeInit, &sizeBuf) )
/* memory allocation */
pSpec = (IppiFFTSpec_R_32f*) ippMalloc( sizeSpec );
pBuffer = (Ipp8u*) ippMalloc( sizeBuf );
pMemInit = (Ipp8u*) ippMalloc( sizeInit );
/* inverse FFT transform */
check_sts( status = ippiFFTInit_R_32f(3, 3, IPP_FFT_DIV_INV_BY_N, ippAlgHintAccurate, pSpec, pMemInit) )
check_sts( status = ippiFFTFwd_RToPack_32f_C1R( pSrcFwd, 8*sizeof(Ipp32f),
pDstFwd, 8*sizeof(Ipp32f), pSpec, pBuffer ) )
EXIT_MAIN
ippFree( pMemInit );
ippFree( pSpec );
ippFree( pBuffer );
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
}