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diff --git a/test/dgreftest/compareoutputengine.h b/test/dgreftest/compareoutputengine.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            compareoutputengine.h
+ *
+ *  Sat May 14 13:27:04 CEST 2016
+ *  Copyright 2016 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 <sndfile.h>
+#include <audiooutputengine.h>
+
+class CompareOutputEngine
+	: public AudioOutputEngine
+{
+public:
+	CompareOutputEngine();
+	~CompareOutputEngine();
+
+	// based on AudioOutputEngine
+	bool init(const Channels& data) 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;
+
+private:
+	SF_INFO info;
+	SNDFILE* handle;
+	std::string file;
+	sample_t buffer[4096 * 16];
+	std::size_t diff_samples{0};
+};