/* 
// Copyright 2015 2018 Intel Corporation All Rights Reserved.
// 
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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;
}