An example of how to get going with MTAudioProcessingTap audio “taps” in Swift 3. The tap itself is not particularly difficult, but the c-callbacks and casts in Swift can take many hours of googling and trawling stackoverflow (at least for me).
Includes attaching an MTAudioProcessingTap to a remote AVPlayer, c callbacks in swift, casting self to and from UnsafeMutableRawPointer, MTAudioProcessingTapCreate, AVMutableAudioMixInputParameters .