I have the following working code:
IppsDFTSpec_C_64f *spec; ippsDFTInitAlloc_C_64f(&spec, N, IPP_FFT_NODIV_BY_ANY, ippAlgHintAccurate); ippsDFTInv_CToC_64f(pRealData, pImagData, pRealData, pImagData, spec, NULL);
Yet the newer compilers (version 13.0.1 in my case) complain about the InitAlloc being deprecated. I tried to switch to the new recommended way, but there seems to be no ippsDFTInit_C_64f function. There is a ippsDFTInit_C_64fc version (note fc vice f at the end), but to use this I have to introduce 2 data copies to make it work:
int specSize, initSize, workSize;
IppStatus status = ippsDFTGetSize_C_64fc(N, IPP_FFT_NODIV_BY_ANY, ippAlgHintAccurate, &specSize, &initSize, &workSize);
IppsDFTSpec_C_64fc *fftSpec = (IppsDFTSpec_C_64fc*)ippsMalloc_8u(specSize);
Ipp8u* pInitBuf = ippsMalloc_8u(initSize);
status = ippsDFTInit_C_64fc(N, IPP_FFT_NODIV_BY_ANY, ippAlgHintAccurate, fftSpec, pInitBuf);
if (pInitBuf) ippsFree(pInitBuf);
Ipp8u* pWorkBuf = ippsMalloc_8u(workSize);
Ipp64fc* pComplexData = ippsMalloc_64fc(N);
for (int i=0; i<N; i++) {
pComplexData[i].re = pRealData[i];
pComplexData[i].im = pImagData[i];
}
ippsDFTInv_CToC_64fc(pComplexData, pComplexData, fftSpec, pWorkBuf);
for (EcUint4 i=0; i<N; i++) {
pRealData[i] = pComplexData[i].re;
pImagData[i] = pComplexData[i].im;
}
ippsFree(pComplexData);
Is there any way to use ippsDFTInv_CToC_64f? If not, it seems to me the better option is to stick with the deprecated code to avoid the data copying (and the code bloat).