/*******************************************************************************
* 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 complex data.
// implemented with Intel(R) Integrated Primitives (Intel(R) IPP) functions:
// ippiFFTGetSize_C_32fc
// ippiFFTInit_C_32fc
// ippiFFTFwd_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 */
Ipp32fc srcFwd[8 * 8] = {0}, dstFwd[8 * 8] = {0}; /* Source/destination images */
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 */
srcFwd[0] = m3;
srcFwd[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(srcFwd, 8*sizeof(Ipp32fc), dstFwd, 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;
}