iPhone: AVAudioPlayer unsupported file type

Question

My app downloads an mp3 from our server and plays it back to the user. The file is 64 kbps (which is well within the acceptable range for iPhone if I understand correctly).

Answer 1

From iOS 7 AVAudioPlayer has new initializer

NSError *error;
[[AVAudioPlayer alloc] initWithData:soundData fileTypeHint:AVFileTypeMPEGLayer3 error:&error]

The supported UTIs

NSString *const AVFileType3GPP;
NSString *const AVFileType3GPP2;
NSString *const AVFileTypeAIFC;
NSString *const AVFileTypeAIFF;
NSString *const AVFileTypeAMR;
NSString *const AVFileTypeAC3;
NSString *const AVFileTypeMPEGLayer3;
NSString *const AVFileTypeSunAU;
NSString *const AVFileTypeCoreAudioFormat;
NSString *const AVFileTypeAppleM4V;
NSString *const AVFileTypeMPEG4;
NSString *const AVFileTypeAppleM4A;
NSString *const AVFileTypeQuickTimeMovie;
NSString *const AVFileTypeWAVE;