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diff --git a/src/mixer/MixerInternal.hxx b/src/mixer/MixerInternal.hxx
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+++ b/src/mixer/MixerInternal.hxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_MIXER_INTERNAL_HXX
+#define MPD_MIXER_INTERNAL_HXX
+
+#include "MixerPlugin.hxx"
+#include "MixerList.hxx"
+#include "thread/Mutex.hxx"
+#include "Compiler.h"
+
+class MixerListener;
+
+class Mixer {
+public:
+	const MixerPlugin &plugin;
+
+	MixerListener &listener;
+
+	/**
+	 * This mutex protects all of the mixer struct, including its
+	 * implementation, so plugins don't have to deal with that.
+	 */
+	Mutex mutex;
+
+	/**
+	 * Is the mixer device currently open?
+	 */
+	bool open;
+
+	/**
+	 * Has this mixer failed, and should not be reopened
+	 * automatically?
+	 */
+	bool failed;
+
+public:
+	explicit Mixer(const MixerPlugin &_plugin, MixerListener &_listener)
+		:plugin(_plugin), listener(_listener),
+		 open(false),
+		 failed(false) {}
+
+	Mixer(const Mixer &) = delete;
+
+	virtual ~Mixer() {}
+
+	bool IsPlugin(const MixerPlugin &other) const {
+		return &plugin == &other;
+	}
+
+	/**
+	 * Open mixer device
+	 *
+	 * @return true on success, false on error
+	 */
+	virtual bool Open(Error &error) = 0;
+
+	/**
+	 * Close mixer device
+	 */
+	virtual void Close() = 0;
+
+	/**
+	 * Reads the current volume.
+	 *
+	 * @return the current volume (0..100 including) or -1 if
+	 * unavailable or on error (error set, mixer will be closed)
+	 */
+	gcc_pure
+	virtual int GetVolume(Error &error) = 0;
+
+	/**
+	 * Sets the volume.
+	 *
+	 * @param volume the new volume (0..100 including) @return
+	 * true on success, false on error
+	 */
+	virtual bool SetVolume(unsigned volume, Error &error) = 0;
+};
+
+#endif