Audio File FFT in an OS X environment

Question

I\'m looking to perform an FFT on a linear PCM audio file (with potentially more than one audio channel) on OS X. What is the best way to go about this?

Several sou

Answer 1

When doing an FFT on audio data, the samples should go into the real portion and the imaginary portion should be zero.

Most FFT libraries, including Apple's vDSP, include a method called a "real FFT", where the input is real (no imaginary component) and the output is complex.