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diff --git a/extern/audaspace/plugins/coreaudio/CoreAudioDevice.h b/extern/audaspace/plugins/coreaudio/CoreAudioDevice.h
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+/*******************************************************************************
+ * Copyright 2009-2021 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 CoreAudioDevice.h
+ * @ingroup plugin
+ * The CoreAudioDevice class.
+ */
+
+#include "CoreAudioSynchronizer.h"
+#include "devices/SoftwareDevice.h"
+
+#include <memory>
+
+#include <AudioUnit/AudioUnit.h>
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This device plays back through CoreAudio, the Apple audio API.
+ */
+class AUD_PLUGIN_API CoreAudioDevice : public SoftwareDevice
+{
+private:
+	/**
+	 * Whether there is currently playback.
+	 */
+	bool m_playback;
+
+	/**
+	 * The CoreAudio AudioUnit.
+	 */
+	AudioUnit m_audio_unit;
+
+	/**
+	 * The Synchronizer.
+	 */
+	std::unique_ptr<CoreAudioSynchronizer> m_synchronizer;
+
+	/**
+	 * Mixes the next bytes into the buffer.
+	 * \param data The CoreAudio device.
+	 * \param flags Unused flags.
+	 * \param time_stamp Unused time stamp.
+	 * \param bus_number Unused bus number.
+	 * \param number_frames Unused number of frames.
+	 * \param buffer_list The list of buffers to be filled.
+	 */
+	AUD_LOCAL static OSStatus CoreAudio_mix(void* data, AudioUnitRenderActionFlags* flags, const AudioTimeStamp* time_stamp, UInt32 bus_number, UInt32 number_frames, AudioBufferList* buffer_list);
+
+	// delete copy constructor and operator=
+	CoreAudioDevice(const CoreAudioDevice&) = delete;
+	CoreAudioDevice& operator=(const CoreAudioDevice&) = delete;
+
+protected:
+	virtual void playing(bool playing);
+
+public:
+	/**
+	 * Opens the CoreAudio audio device for playback.
+	 * \param specs The wanted audio specification.
+	 * \param buffersize The size of the internal buffer.
+	 * \note The specification really used for opening the device may differ.
+	 * \exception Exception Thrown if the audio device cannot be opened.
+	 */
+	CoreAudioDevice(DeviceSpecs specs, int buffersize = AUD_DEFAULT_BUFFER_SIZE);
+
+	/**
+	 * Closes the CoreAudio audio device.
+	 */
+	virtual ~CoreAudioDevice();
+
+	virtual ISynchronizer* getSynchronizer();
+
+	/**
+	 * Registers this plugin.
+	 */
+	static void registerPlugin();
+};
+
+AUD_NAMESPACE_END