public static extern IppStatus ippsFFTGetSize_C_64f([In] int order, [In] IppFftFlag flag, [In] IppHintAlgorithm hint, ref int pSpecSize, ref int pSpecBufferSize, ref int pBufferSize);
public unsafe static extern IppStatus ippsFFTInit_C_64f(ref IntPtr ppFFTSpec, [In] int order, [In] IppFftFlag flag, [In] IppHintAlgorithm hint, [In] byte *pSpec, [In] byte[] pSpecBuffer);
