I would like to access the file representing the song in your ipod library, so I can perform some calculations. Is there actually way of doing that as it seems I am not allowed to access the file when I get the AssetsURL property of the MPMediaItem object.
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The URL you get back is not a file URL, but you can use it to create an AVAssetReader/AVAssetReaderTrackOutput pair that will let you read either the packet or LPCM data of the track.