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diff --git a/intern/audaspace/FX/AUD_IDynamicIIRFilterCalculator.h b/intern/audaspace/FX/AUD_IDynamicIIRFilterCalculator.h
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+++ b/intern/audaspace/FX/AUD_IDynamicIIRFilterCalculator.h
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+/*
+ * ***** 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/FX/AUD_IDynamicIIRFilterCalculator.h
+ *  \ingroup audfx
+ */
+
+#ifndef AUD_IDYNAMICIIRFILTERCALCULATOR_H
+#define AUD_IDYNAMICIIRFILTERCALCULATOR_H
+
+#include <vector>
+
+/**
+ * This interface calculates dynamic filter coefficients which depend on the
+ * sampling rate for AUD_DynamicIIRFilterReaders.
+ */
+class AUD_IDynamicIIRFilterCalculator
+{
+public:
+	/**
+	 * Recalculates the filter coefficients.
+	 * \param rate The sample rate of the audio data.
+	 * \param[out] b The input filter coefficients.
+	 * \param[out] a The output filter coefficients.
+	 */
+	virtual void recalculateCoefficients(AUD_SampleRate rate,
+										 std::vector<float>& b,
+										 std::vector<float>& a)=0;
+};
+
+#endif // AUD_IDYNAMICIIRFILTERCALCULATOR_H