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diff --git a/extern/audaspace/include/fx/DynamicIIRFilterReader.h b/extern/audaspace/include/fx/DynamicIIRFilterReader.h
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+++ b/extern/audaspace/include/fx/DynamicIIRFilterReader.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 DynamicIIRFilterReader.h
+ * @ingroup fx
+ * The DynamicIIRFilterReader class.
+ */
+
+#include "fx/IIRFilterReader.h"
+
+AUD_NAMESPACE_BEGIN
+
+class IDynamicIIRFilterCalculator;
+
+/**
+ * This class is for dynamic infinite impulse response filters with simple
+ * coefficients that change depending on the sample rate.
+ */
+class AUD_API DynamicIIRFilterReader : public IIRFilterReader
+{
+private:
+	/**
+	 * The sound for dynamically recalculating filter coefficients.
+	 */
+	std::shared_ptr<IDynamicIIRFilterCalculator> m_calculator;
+
+public:
+	/**
+	 * Creates a new DynamicIIRFilterReader.
+	 * @param reader The reader the filter is applied on.
+	 * @param calculator The IDynamicIIRFilterCalculator that recalculates the filter coefficients.
+	 */
+	DynamicIIRFilterReader(std::shared_ptr<IReader> reader,
+							   std::shared_ptr<IDynamicIIRFilterCalculator> calculator);
+
+	/**
+	 * The function sampleRateChanged is called whenever the sample rate of the
+	 * underlying reader changes and thus updates the filter coefficients.
+	 * @param rate The new sample rate.
+	 */
+	virtual void sampleRateChanged(SampleRate rate);
+};
+
+AUD_NAMESPACE_END