Deprecated ippiFFTFree_C_32fc

[Andrew_Rice]

Hi,

ippiFFTFree_C_32fc is now deprecated but we can still use ippiFFTInitAlloc_C_32fc to allocate memory. If we use ippiFFTInitAlloc_C_32fc what do we call to free the memory?

Thanks,

Andy

[Igor_A_Intel]

Hi Andy,

InitAlloc is also deprecated:

IPP_DEPRECATED("is deprecated. This function is obsolete and will be removed in one of the future IPP releases. Use the following link for details: http://software.intel.com/en-us/articles/intel-ipp-71-deprecated-features/")\
IPPAPI (IppStatus, ippiFFTInitAlloc_C_32fc,
                   ( IppiFFTSpec_C_32fc** pFFTSpec,
                     int orderX, int orderY, int flag, IppHintAlgorithm hint ))

the recommendation is to use GetSize+Init pair and allocate required memory buffers at your side.

regards, Igor

[Andrew_Rice]

Hi Igor,

According the the link you sent and the documentation ippiFFTInitAlloc_C_32fc isn't deprecated only the integer version is ippiFFTInitAlloc_R_32s. This is confusing me!

Regarding your workaround, I can see  ippiFFTGetBufSize can be used for calculating the buffer size but how do I initialize the IppiFFTSpec_R_32f structure?

Thanks,

Andy

[Chao_Y_Intel]

Andy,

It can call  ippsFFTInit_R_32f function to init the structure.  Check some more example here:
http://software.intel.com/en-us/articles/how-to-use-intel-ipp-s-1d-fourier-transform-functions

Thanks,
Chao

[Andrew_Rice]

Hi,

I'm sorry, this isn't making sense to me. We need to use the ippiFFTFwd not the ippsFFTFwd because we are doing an FFT on image data. The ippiFFTFwd functions take an IppiFFTSpec_C_32fc so we can't use ippsFFTInit_R_32f because this takes an IppsFFTSpec_C_32fc.

The code we currently have is this:

IppiFFTSpec_C_32fc *spec = NULL;

ippiFFTInitAlloc_C_32fc(&spec, orderX, orderY, IPP_FFT_DIV_FWD_BY_N, ippAlgHintAccurate);

ippiFFTFwd_CToC_32fc_C1IR(complexBuffer, width * sizeof(Ipp32fc), spec, 0);

ippiFFTFree_C_32fc(spec);

We have fixed the ippiFFTFwd_CToC_32fc_C1IR call to not use the inplace version. But it also says when we compile that ippiFFTFree_C_32fc is deprecated but ippiFFTInitAlloc_C_32fc isn't. 

Can you please tell me exactly what calls to replace the above 4 lines with that aren't deprecated?

Thanks,

Andy

[SergeyKostrov]

>>...Can you please tell me exactly what calls to replace the above 4 lines with that aren't deprecated? Even if some IPP functions are marked as Deprecated they are Not removed yet. You could provide a feedback at: . http://software.intel.com/sites/products/ipp-deprecated-features-feedback

[Igor_A_Intel]

Hi Andy,

you haven't mentioned which IPP version you use. I've taken a look at 8.0 headers - both InitAlloc and Free for all FFT flavors are marked as deprecated. The recommendation is the same as well for ippSP as for ippIP - to use GetBufferSize, malloc (ippMalloc) at your side and then to use Init for FFTSpec initialization.

Regards, Igor