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diff --git a/src/MusicBuffer.hxx b/src/MusicBuffer.hxx
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+++ b/src/MusicBuffer.hxx
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+/*
+ * Copyright (C) 2003-2013 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_MUSIC_BUFFER_HXX
+#define MPD_MUSIC_BUFFER_HXX
+
+#include "util/SliceBuffer.hxx"
+#include "thread/Mutex.hxx"
+
+struct music_chunk;
+
+/**
+ * An allocator for #music_chunk objects.
+ */
+class MusicBuffer {
+	/** a mutex which protects #buffer */
+	Mutex mutex;
+
+	SliceBuffer<music_chunk> buffer;
+
+public:
+	/**
+	 * Creates a new #MusicBuffer object.
+	 *
+	 * @param num_chunks the number of #music_chunk reserved in
+	 * this buffer
+	 */
+	MusicBuffer(unsigned num_chunks);
+
+#ifndef NDEBUG
+	/**
+	 * Check whether the buffer is empty.  This call is not
+	 * protected with the mutex, and may only be used while this
+	 * object is inaccessible to other threads.
+	 */
+	bool IsEmptyUnsafe() const {
+		return buffer.IsEmpty();
+	}
+#endif
+
+	/**
+	 * Returns the total number of reserved chunks in this buffer.  This
+	 * is the same value which was passed to the constructor
+	 * music_buffer_new().
+	 */
+	gcc_pure
+	unsigned GetSize() const {
+		return buffer.GetCapacity();
+	}
+
+	/**
+	 * Allocates a chunk from the buffer.  When it is not used anymore,
+	 * call Return().
+	 *
+	 * @return an empty chunk or nullptr if there are no chunks
+	 * available
+	 */
+	music_chunk *Allocate();
+
+	/**
+	 * Returns a chunk to the buffer.  It can be reused by
+	 * Allocate() then.
+	 */
+	void Return(music_chunk *chunk);
+};
+
+#endif