Applying FFT to a .wav

Hello,
I am trying to extract data from a .wav using the source code Capture=20
given with OpenAL. Indeed after capturing a sound from a microphone I=20
must apply fft to it. I succeeded to capture and play my recorded sound=20
and I figured out that the data of my wave are contained in the object=20
"void **lplpAudioData" from the function "GetWaveData". But I don't know=20
how to apply fft to it using the library FFTW. Furhermore I don't know=20
how to compute the value contained in this "lplpAudioData". How can I=20
access to the data needed for a fft ?

Thanks for the help

--=20
Brefort Quentin
Student-Engineer at ENSTA Bretagne
Option des Syst=C3=A8mes d'Information, de Perception et de D=C3=A9cision=
 (SPID)
Promotion 2014
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