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diff --git a/intern/audaspace/intern/AUD_IWriter.h b/intern/audaspace/intern/AUD_IWriter.h
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+/*
+ * $Id$
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * Copyright 2009-2011 Jörg Hermann Müller
+ *
+ * This file is part of AudaSpace.
+ *
+ * Audaspace 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.
+ *
+ * AudaSpace 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 Audaspace; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file audaspace/intern/AUD_IWriter.h
+ *  \ingroup audaspaceintern
+ */
+
+
+#ifndef AUD_IWRITER
+#define AUD_IWRITER
+
+#include "AUD_Space.h"
+
+/**
+ * This class represents a sound sink where audio data can be written to.
+ */
+class AUD_IWriter
+{
+public:
+	/**
+	 * Destroys the writer.
+	 */
+	virtual ~AUD_IWriter(){}
+
+	/**
+	 * Returns how many samples have been written so far.
+	 * \return The writing position as sample count. May be negative if unknown.
+	 */
+	virtual int getPosition() const=0;
+
+	/**
+	 * Returns the specification of the audio data being written into the sink.
+	 * \return The AUD_DeviceSpecs structure.
+	 * \note Regardless of the format the input still has to be float!
+	 */
+	virtual AUD_DeviceSpecs getSpecs() const=0;
+
+	/**
+	 * Request to write the next length samples out into the sink.
+	 * \param length The count of samples to write.
+	 * \param buffer The pointer to the buffer containing the data.
+	 */
+	virtual void write(unsigned int length, sample_t* buffer)=0;
+};
+
+#endif //AUD_IWRITER