This performs the FFT on timedata and puts the result in freqdata.
timedata must have as many samples as specified with the len parameter while allocating the
S16 instance with S16.
freqdata must be large enough to hold len/2 + 1 S16Complex
frequency domain samples.
| this |
S16 instance for this call |
| timedata |
Buffer of the samples in the time domain |
| freqdata |
Target buffer for the samples in the frequency domain |