I am using MPMusicPlayerController for playing back DRM protected files from the iPod-libaray and I would like to build an vu-meter for metering the volume of the song. I found some discussions which recommend to use MPMediaItemPropertyAssetURL and AudioPlayer but [(MPMediaItem*)song valueForProperty:MPMediaItemPropertyAssetURL] of DRM protected audio files is NULL? Is there any possibility for metering DRM files from iPod-libaray?
I tried to record with the build in microphon during playback of DRM files but it seems that is not possible, too?