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diff --git a/extern/audaspace/include/ISound.h b/extern/audaspace/include/ISound.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 ISound.h
+ * @ingroup general
+ * The ISound interface.
+ */
+
+#include "Audaspace.h"
+
+#include <memory>
+
+AUD_NAMESPACE_BEGIN
+
+class IReader;
+
+/**
+ * @interface ISound
+ * This class represents a type of sound source and saves the necessary values
+ * for it. It is able to create a reader that is actually usable for playback
+ * of the respective sound source through the factory method createReader.
+ */
+class AUD_API ISound
+{
+public:
+	/**
+	 * Destroys the sound.
+	 */
+	virtual ~ISound() {}
+
+	/**
+	 * Creates a reader for playback of the sound source.
+	 * \return A pointer to an IReader object or nullptr if there has been an
+	 *         error.
+	 * \exception Exception An exception may be thrown if there has been
+	 *            a more unexpected error during reader creation.
+	 */
+	virtual std::shared_ptr<IReader> createReader()=0;
+};
+
+AUD_NAMESPACE_END