Equivalent of FFTW's fftw_plan_r2r_2d in KISS FFT

Question

Currently I am using FFTW's "fftw_plan_r2r_2d" with FFTW_REDFT10 as a kind and FFTW_ESTIMATE as the flag in my project. I am thinking of using KISSFFT for the transforms.I need the set of calls needed to perform the same operation in KISS FFT.

I am developing an ios app,So I want to know if its possible to use ios Accelerate Framework for the transform.

Answer 1

From FFTW docs

FFTW_REDFT10 computes an REDFT10 transform, i.e. a DCT-II (sometimes called “the” DCT). (Logical N=2*n, inverse is FFTW_REDFT01.)

kissfft does not directly support the DCT, just FFTs. Some DCTs can be trivially adapted to/from the real-version FFT/IFFT with trivial manipulation, but I cannot recall if DCT-II is one of these.