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vDSP_fft2d_zripD

Computes a 2D forward or inverse in-place, double-precision real FFT.

Declaration

extern void vDSP_fft2d_zripD(FFTSetupD __Setup, const DSPDoubleSplitComplex *__C, vDSP_Stride __IC0, vDSP_Stride __IC1, vDSP_Length __Log2N0, vDSP_Length __Log2N1, FFTDirection __flag);

Parameters

  • __Setup:

    The FFT setup structure for this transform. The setup’s structure Log2N must be greater than or equal to this function’s Log2N0 and Log2N1.

  • __C:

    A pointer to the input-output data.

  • __IC0:

    The stride between the elements in a row of C, set to 1 for best performance.

  • __IC1:

    The increment, in elements, between consecutive elements in a column of C, which is also the distance between adjacent rows of C. Unless C is a submatrix, pass 0 to have the function calculate the default column stride as the row stride ( __IC0) multiplied by the column count.

  • __Log2N0:

    The base 2 exponent of the number of columns to process for each row.

  • __Log2N1:

    The base 2 exponent of the number of rows to process. For example, to process 64 rows of 128 columns, specify 7 for Log2N0 and 6 for Log2N1.

  • __flag:

    A flag that specifies the transform direction. Pass Kfftdirection_forward to transform from the spatial domain to the frequency domain. Pass Kfftdirection_inverse to transform from the frequency domain to the spatial domain.

Discussion

See Also

In-Place FFT Functions