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MPMoviePlayerController playing audio stream in the background
NSURL *mediaURL = [NSURL URLWithString:@"http://url.to.my.stream"];

MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:mediaURL];

[[NSNotificationCenter defaultCenter] addObserver:self

                                         selector:@selector(moviePlayBackDidFinish:)

                                             name:MPMoviePlayerPlaybackDidFinishNotification

                                           object:nil];


[mp setControlStyle:MPMovieControlStyleFullscreen];

[mp setMovieSourceType:MPMovieSourceTypeStreaming];

[mp setFullscreen:YES];


[self.view addSubview:[mp view]];


[mp prepareToPlay];

[mp play];

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
[audioSession setActive:YES error:nil];