Initial Amuse AudioUnit frontend architecture

AudioUnit/AudioUnitBackend.hpp

@@ -0,0 +1,56 @@
+#ifndef __AMUSE_AUDIOUNIT_BACKEND_HPP__
+#define __AMUSE_AUDIOUNIT_BACKEND_HPP__
+#ifdef __APPLE__
+
+#include <Availability.h>
+
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 101100
+#define AMUSE_HAS_AUDIO_UNIT 1
+
+#include <AudioUnit/AudioUnit.h>
+
+#include "optional.hpp"
+
+#include "amuse/BooBackend.hpp"
+#include "amuse/Engine.hpp"
+#include "amuse/IBackendVoice.hpp"
+#include "amuse/IBackendSubmix.hpp"
+#include "amuse/IBackendVoiceAllocator.hpp"
+
+namespace amuse
+{
+
+/** Backend MIDI event reader for controlling sequencer with external hardware / software */
+class AudioUnitBackendMIDIReader : public BooBackendMIDIReader
+{
+    friend class AudioUnitBackendVoiceAllocator;
+public:
+    AudioUnitBackendMIDIReader(Engine& engine)
+    : BooBackendMIDIReader(engine, "AudioUnit MIDI") {}
+};
+
+/** Backend voice allocator implementation for AudioUnit mixer */
+class AudioUnitBackendVoiceAllocator : public BooBackendVoiceAllocator
+{
+    friend class AudioUnitBackendMIDIReader;
+public:
+    AudioUnitBackendVoiceAllocator(boo::IAudioVoiceEngine& booEngine)
+    : BooBackendVoiceAllocator(booEngine) {}
+};
+
+void RegisterAudioUnit();
+
+}
+
+@interface AmuseAudioUnit : AUAudioUnit
+{
+    std::unique_ptr<boo::IAudioVoiceEngine> m_booBackend;
+    std::experimental::optional<amuse::AudioUnitBackendVoiceAllocator> m_voxAlloc;
+    std::experimental::optional<amuse::Engine> m_engine;
+    AUAudioUnitBusArray* m_outs;
+}
+@end
+
+#endif
+#endif
+#endif // __AMUSE_AUDIOUNIT_BACKEND_HPP__