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diff --git a/sound/decoders/shorten.h b/sound/decoders/shorten.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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.
+
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+// The code in this file is currently only used in SAGA2.
+// So when it is disabled, we will skip compiling it.
+// We also enable this code for ScummVM builds including support
+// for dynamic engine plugins.
+// If you plan to use this code in another engine, you will have
+// to add the proper define check here.
+#if !(defined(ENABLE_SAGA2) || defined(DYNAMIC_MODULES))
+
+#else
+
+#ifndef SOUND_SHORTEN_H
+#define SOUND_SHORTEN_H
+
+#include "common/scummsys.h"
+
+namespace Common { class ReadStream; }
+
+namespace Audio {
+
+class AudioStream;
+
+/**
+ * Try to load a Shorten file from the given stream. Returns true if
+ * successful. In that case, the stream's seek position will be set to the
+ * start of the audio data, and size, rate and flags contain information
+ * necessary for playback.
+ */
+byte *loadShortenFromStream(Common::ReadStream &stream, int &size, int &rate, byte &flags);
+
+/**
+ * Try to load a Shorten file from the given stream and create an AudioStream
+ * from that data.
+ *
+ * This function uses loadShortenFromStream() internally.
+ */
+AudioStream *makeShortenStream(Common::ReadStream &stream);
+
+} // End of namespace Audio
+
+#endif
+
+#endif // engine and dynamic plugins guard
+