Audio File Stream Service and FLAC

According to the WWDC 2017 "What's new in Core Audio" Video, AudioToolbox now has codec,file and streaming support for FLAC.


However when I use Audio File Stream Service to parse a FLAC file using AudioFileStreamOpen(_:_:_:_:_:). I keep getting the "Unsupported file Type" error.


Does anyone know if FLAC format is supported by AudioFileStreamOpen?


Thanks

Louis