How to set up a spectrum analyser for an audio file?
I understand that i must get the data, and then apply a FFT and then show the spectrum analyser for the frequencies.
But how to get the data? of the playing audio file? Should I use the AudioQueue service to get the data via the call back ? And then use the data from the obtained call back to apply Fast Fourier transform? how to apply fast Fourier transform in a simple way to suit my needs
I read this post Using the Apple FFT and Accelerate Framework
but still require lot of clarifications, and cannot find any documentation clear enough
