iOS get sound loudness [closed] - iphone

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I am developing a iPhone application that needs realtime sound processing. What i would like to archive is to get the sound loudness (from the microphone), compare it with a threshold and do some logic based on the loudness level. Is there any library in iOS that would enable me to do this? Does iOS have any built in function that would give me the current sound loudness level?
Thanks!

This SO question looks like a good place to start (it's close enough to be a dupe, maybe, but I figured I'd answer anyway).

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please anyone know is there any sample code for beat detection iPhone?.How to implement fft algorithm in iphone to detect music beats?.I see in one forum that apple's sample code auriotouch doing the beat detection, is it correct?.
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