Andreas Dolinsek wrote:
> Hello,
> i want to code a graphical equalizer from a mp3 stream with openAL
> (split frquency in channels). can you give me some hints to for an
> easy start (functions etc.)?
>
> thank you!
The only thing OpenAL will help you do here is play back the mp3 stream
(after you've decoded it into a PCM stream by some other method).
You'll probably want something like LAME for this
(
http://lame.sourceforge.net).
If you really mean to implement a graphic equalizer (controls that allow
you to boost and/or attenuate audio at specific frequencies) you'll need
to look up how to implement band-pass filters, or find a library that
does this for you. I don't know of any off the top of my head (try Google).
If you're really just after a spectrum analyzer (just showing the
amplitude of the audio at specific component frequencies), you just need
to run the audio through a Fast Fourier Transform as you decode it.
Look up fftw for this (
http://www.fftw.org).
Hope this helps,
--"J"
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