AudioToolbox iOS 10.3 to 11.0 API Differences

AUAudioUnit.h
AUAudioUnitImplementation.h
AUComponent.h
AudioFile.h
AudioFileStream.h
Declaration
FromOSStatus AudioFileStreamParseBytes(AudioFileStreamID _Nonnull inAudioFileStream, UInt32 inDataByteSize, const void * _Nonnull inData, AudioFileStreamParseFlags inFlags)
ToOSStatus AudioFileStreamParseBytes(AudioFileStreamID _Nonnull inAudioFileStream, UInt32 inDataByteSize, const void * _Nullable inData, AudioFileStreamParseFlags inFlags)

AudioUnitProperties.h