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diff --git a/src/audiocachefile.h b/src/audiocachefile.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            cacheaudiofile.h
+ *
+ *  Thu Dec 24 12:17:58 CET 2015
+ *  Copyright 2015 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 General Public License as published by
+ *  the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU 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 <string>
+#include <list>
+#include <map>
+#include <mutex>
+
+#include <sndfile.h>
+
+#include <audiotypes.h>
+
+class CacheChannel {
+public:
+	size_t channel;
+	sample_t* samples;
+	size_t num_samples;
+	volatile bool* ready;
+};
+
+using CacheChannels = std::list<CacheChannel>;
+
+//! This class is used to encapsulate reading from a single file source.
+//! The access is ref counted so that the file is only opened once and closed
+//! when it is no longer required.
+class AudioCacheFile {
+	friend class AudioCacheFiles;
+	friend class TestableAudioCacheFiles;
+public:
+	//! Create file handle for filename.
+	AudioCacheFile(const std::string& filename);
+
+	//! Closes file handle.
+	~AudioCacheFile();
+
+	//! Get sample count of the file connected with this cache object.
+	size_t getSize() const;
+
+	//! Get filename of the file connected with this cache object.
+	const std::string& getFilename() const;
+
+	//! Get number of channels in the file
+	size_t getChannelCount();
+
+	//! Read audio data from the file into the supplied channel caches.
+	void readChunk(const CacheChannels& channels, size_t pos, size_t num_samples);
+
+private:
+	int ref{0};
+	SNDFILE* fh{nullptr};
+	SF_INFO sf_info;
+	std::string filename;
+};
+
+class AudioCacheFiles {
+public:
+	//! Get the CacheAudioFile object corresponding to filename.
+	//! If it does not exist it will be created.
+	//! It's ref count will be increased.
+	AudioCacheFile& getFile(const std::string& filename);
+
+	//! Release the CacheAudioFile corresponding to filename.
+	//! It's ref count will be decreased.
+	//! If the ref count reaches 0 the object will be deleted.
+	void releaseFile(const std::string& filename);
+
+protected:
+	std::map<std::string, AudioCacheFile*> audiofiles;
+	std::mutex mutex;
+};