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diff --git a/extern/audaspace/plugins/coreaudio/CoreAudioSynchronizer.h b/extern/audaspace/plugins/coreaudio/CoreAudioSynchronizer.h
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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+#ifdef COREAUDIO_PLUGIN
+#define AUD_BUILD_PLUGIN
+#endif
+
+/**
+ * @file CoreAudioSynchronizer.h
+ * @ingroup plugin
+ * The CoreAudioSynchronizer class.
+ */
+
+#include "devices/ISynchronizer.h"
+
+#include <AudioUnit/AudioUnit.h>
+#include <AudioToolbox/CoreAudioClock.h>
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This class is a Synchronizer implementation using a CoreAudio clock.
+ */
+class AUD_PLUGIN_API CoreAudioSynchronizer : public ISynchronizer
+{
+private:
+    /// The CoreAudio clock referene.
+    CAClockRef m_clock_ref;
+
+	/// Whether the clock is currently playing.
+	bool m_playing;
+
+public:
+	/**
+	 * Creates a new CoreAudioSynchronizer.
+	 * @param device The device that should be synchronized.
+	 */
+    CoreAudioSynchronizer(AudioUnit& audio_unit);
+    virtual ~CoreAudioSynchronizer();
+
+	virtual void seek(std::shared_ptr<IHandle> handle, double time);
+	virtual double getPosition(std::shared_ptr<IHandle> handle);
+	virtual void play();
+	virtual void stop();
+	virtual void setSyncCallback(syncFunction function, void* data);
+	virtual int isPlaying();
+};
+
+AUD_NAMESPACE_END