CoreAudio.component: Support AudioOutputUnit selectors via Carbon's dispatcher

src/CoreAudio/CoreAudioComponent/AUHAL.cpp

···
 
 	return noErr;
 }
+
+// AUDispatch.cpp doesn't implement dispatch code for AudioOutputUnits
+OSStatus AUHAL::ComponentEntryDispatch(ComponentParameters *params, AUHAL *This)
+{
+	if (This == NULL) return kAudio_ParamError;
+
+	OSStatus result = noErr;
+
+	switch (params->what)
+	{
+		case kComponentCanDoSelect:
+			switch (GetSelectorForCanDo(params))
+			{
+				case kAudioOutputUnitStartSelect:
+				case kAudioOutputUnitStopSelect:
+					return 1;
+			}
+			break;
+		case kAudioOutputUnitStartSelect:
+		{
+			CAMutex::Locker lock(This->GetMutex());
+			return This->Start();
+		}
+		case kAudioOutputUnitStopSelect:
+		{
+			CAMutex::Locker lock(This->GetMutex());
+			return This->Stop();
+		}
+	}
+
+	return AUBase::ComponentEntryDispatch(params, This);
+}

src/CoreAudio/CoreAudioComponent/AUHAL.h

···
 	OSStatus GetProperty(AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void* outData) override;
 
 	OSStatus Render(AudioUnitRenderActionFlags& ioActionFlags, const AudioTimeStamp& inTimeStamp, UInt32 inNumberFrames) override;
+
+	static OSStatus ComponentEntryDispatch(ComponentParameters *params, AUHAL *This);
 private:
 	static OSStatus playbackCallback(AudioObjectID inObjectID,
 		const AudioTimeStamp* inNow, const AudioBufferList* inInputData,