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diff --git a/extern/audaspace/include/IReader.h b/extern/audaspace/include/IReader.h
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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file IReader.h
+ * @ingroup general
+ * The IReader interface.
+ */
+
+#include "respec/Specification.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * @interface IReader
+ * This class represents a sound source as stream or as buffer which can be read
+ * for example by another reader, a device or whatever.
+ */
+class AUD_API IReader
+{
+public:
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~IReader() {}
+
+	/**
+	 * Tells whether the source provides seeking functionality or not.
+	 * \warning This doesn't mean that the seeking always has to succeed.
+	 * \return Always returns true for readers of buffering types.
+	 */
+	virtual bool isSeekable() const=0;
+
+	/**
+	 * Seeks to a specific position in the source.
+	 * \param position The position to seek for measured in samples. To get
+	 *        from a given time to the samples you simply have to multiply the
+	 *        time value in seconds with the sample rate of the reader.
+	 * \warning This may work or not, depending on the actual reader.
+	 */
+	virtual void seek(int position)=0;
+
+	/**
+	 * Returns an approximated length of the source in samples.
+	 * \return The length as sample count. May be negative if unknown.
+	 */
+	virtual int getLength() const=0;
+
+	/**
+	 * Returns the position of the source as a sample count value.
+	 * \return The current position in the source. A negative value indicates
+	 *         that the position is unknown.
+	 * \warning The value returned doesn't always have to be correct for readers,
+	 *          especially after seeking.
+	 */
+	virtual int getPosition() const=0;
+
+	/**
+	 * Returns the specification of the reader.
+	 * \return The Specs structure.
+	 */
+	virtual Specs getSpecs() const=0;
+
+	/**
+	 * Request to read the next length samples out of the source.
+	 * The buffer supplied has the needed size.
+	 * \param[in,out] length The count of samples that should be read. Shall
+	 *                contain the real count of samples after reading, in case
+	 *                there were only fewer samples available.
+	 *                A smaller value also indicates the end of the reader.
+	 * \param[out] eos End of stream, whether the end is reached or not.
+	 * \param[in] buffer The pointer to the buffer to read into.
+	 */
+	virtual void read(int& length, bool& eos, sample_t* buffer)=0;
+};
+
+AUD_NAMESPACE_END