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diff --git a/intern/audaspace/FX/AUD_DoubleFactory.h b/intern/audaspace/FX/AUD_DoubleFactory.h
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+++ b/intern/audaspace/FX/AUD_DoubleFactory.h
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+/*
+ * $Id$
+ *
+ * ***** BEGIN LGPL LICENSE BLOCK *****
+ *
+ * Copyright 2009 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 Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with AudaSpace.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * ***** END LGPL LICENSE BLOCK *****
+ */
+
+#ifndef AUD_DOUBLEFACTORY
+#define AUD_DOUBLEFACTORY
+
+#include "AUD_IFactory.h"
+
+/**
+ * This factory plays two other factories behind each other.
+ * \note Readers from the underlying factories must have the same sample rate and channel count.
+ */
+class AUD_DoubleFactory : public AUD_IFactory
+{
+private:
+	/**
+	 * First played factory.
+	 */
+	AUD_IFactory* m_factory1;
+
+	/**
+	 * Second played factory.
+	 */
+	AUD_IFactory* m_factory2;
+
+	// hide copy constructor and operator=
+	AUD_DoubleFactory(const AUD_DoubleFactory&);
+	AUD_DoubleFactory& operator=(const AUD_DoubleFactory&);
+
+public:
+	/**
+	 * Creates a new double factory.
+	 * \param factory1 The first input factory.
+	 * \param factory2 The second input factory.
+	 */
+	AUD_DoubleFactory(AUD_IFactory* factory1, AUD_IFactory* factory2);
+
+	virtual AUD_IReader* createReader() const;
+};
+
+#endif //AUD_DOUBLEFACTORY