kAudioFileStreamProperty_MagicCookieData

A pointer (void *) to a magic cookie. For audio file types that require a magic cookie before packets can be written to a file, you should get this property value before calling the Audiofilewritebytes(_:_:_:_:_:) or Audiofilewritepackets(_:_:_:_:_:_:_:) functions.

var kAudioFileStreamProperty_MagicCookieData: AudioFileStreamPropertyID { get }