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* If lenmem is NULL, then kiss_fft_alloc will allocate a cfg buffer using malloc.
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* The returned value should be free()d when done to avoid memory leaks.
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* The state can be placed in a user supplied buffer 'mem':
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* If lenmem is not NULL and mem is not NULL and *lenmem is large enough,
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* then the function places the cfg in mem and the size used in *lenmem
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* If lenmem is not NULL and ( mem is NULL or *lenmem is not large enough),
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* buffer size in *lenmem.
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void kf_work(kiss_fft_cpx * Fout,const kiss_fft_cpx * f,const size_t fstride,
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int in_stride,int * factors,const kiss_fft_cfg st,int N,int s2,int m2);