AudioToolbox iOS 10.3 to 11.0 API Differences

AUAudioUnit.h
Added AUMIDIOutputEventBlock
Added AUAudioUnit.audioUnitShortName
Added AUAudioUnit.MIDIOutputNames
Added AUAudioUnit.providesUserInterface
Added AUAudioUnit.MIDIOutputEventBlock
Added AUAudioUnit.running
Added AUAudioUnitBus.shouldAllocateBuffer
AUAudioUnitImplementation.h
Added AUAudioUnit.MIDIOutputBufferSizeHint
AUComponent.h
Added kAudioUnitErr_MIDIOutputBufferFull
Added kAudioUnitErr_ExtensionNotFound
Added AudioUnitExtensionSetComponentList()
Added AudioUnitExtensionCopyComponentList()
AudioFile.h
Added kAudioFileRF64Type
Added kAudioFileFLACType
AudioFileStream.h
Modified AudioFileStreamParseBytes()
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
Added kAudioUnitProperty_MIDIOutputCallbackInfo
Added kAudioUnitProperty_MIDIOutputCallback
Added AUMIDIOutputCallback
Added AUMIDIOutputCallbackStruct
Added kSpatializationAlgorithm_HRTFHQ