Function av_fft_calc

pub unsafe extern "C" fn av_fft_calc(
    s: *mut FFTContext,
    z: *mut FFTComplex,
)

Do a complex FFT with the parameters defined in av_fft_init(). The input data must be permuted before. No 1.0/sqrt(n) normalization is done. @deprecated use the av_tx_fn value returned by av_tx_init, which also does permutation