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Frequency Content

Hello everyone,

I am in desperate need of a way to determine the frequency content of a
'raw' amplitude-time sample.  I know that Fourier Transform can do this, but
all of the texts I have read are at the advanced level, and quite frankly I
have no idea what they are talking about.

The raw data is in the form of a 512 byte array, defined as char
rawdata[512].  This array is continually filled by my microphone audio
grabbing code.  Now I need to be able to pass this array to a function which
would fill another array, say fourierdata, with the frequency information.

If anyone can be of assistance, I would really appreciate it.  Specifically,
if you can supply me with C code to implement such a fourier function, I
would be very greatful.

Thank you,
Marius Myburg