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diff --git a/drumgizmo/output/coreaudio.h b/drumgizmo/output/coreaudio.h
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+++ b/drumgizmo/output/coreaudio.h
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+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            coreaudio.h
+ *
+ *  Sat Oct 21 18:27:52 CEST 2017
+ *  Copyright 2017 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <audiotypes.h>
+#include <CoreAudio/CoreAudio.h>
+#include <AudioUnit/AudioUnit.h>
+
+#include "audiooutputengine.h"
+
+class CoreAudioOutputEngine
+	: public AudioOutputEngine
+{
+public:
+	CoreAudioOutputEngine();
+	~CoreAudioOutputEngine();
+
+	// based on AudioOutputEngine
+	bool init(const Channels& chan) override;
+	void setParm(const std::string& parm, const std::string& value) override;
+	bool start() override;
+	void stop() override;
+	void pre(size_t nsamples) override;
+	void run(int ch, sample_t* samples, size_t nsamples) override;
+	void post(size_t nsamples) override;
+	size_t getSamplerate() const override;
+	bool isFreewheeling() const override;
+
+private:
+	AudioDeviceID device_id;
+};