CIGAL Reference Manual, Chapter 6 (RealTime): r_fft
usage: r_fft opflg eflag ltime src dst [nvals flg]
R_FFT is a REALTIME operator.
Perform an FFT on some or all of the values in the SRC array; put the result in the DST array.
If NVALS is missing, all values in SRC will be used.
If FLG & 1, sum values prior to the current SRC pointer location.
If FLG & 2, don't include the current SRC pointer location.
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