How to convert AVAsset to NSData or save it to file manager

I am trying to do that using AVAsset to record Audio file and then after first i store it on NSFileManager and after that by convert it to nsdata i Call API to store it.

I am successful to Create AVAsset recording file and play it using third party Class that is SCPlayer.

Now problem is that i don't know how to Use AVAsset file for save it in file manager and then after call API to sent it by converting it to NSData.

Is any way to convert AVAsset to NSData???

Please Help...