I'm trying to perform Fast Fourier Transform on a .3gpp audio file. The file contains a small 5 second recording in 44100kHz from the phones microphone.

Every Java FFT algorithm I can find only takes double[], float[] or Complex[] inputs, for obvious reasons, but I'm reading in the audio file in a byte-array, so I'm kind of confused as to where I go from here. The only thing I could find is the answer to a previous question:

Android audio FFT to retrieve specific frequency magnitude using audiorecord

But I'm unsure as to wether or not this is the correct procedure. Anyone with any insight?

java android fft
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