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diff --git a/sound/decoders/vorbis.h b/sound/decoders/vorbis.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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+/**
+ * @file
+ * Sound decoder used in engines:
+ *  - agos
+ *  - kyra
+ *  - m4
+ *  - queen
+ *  - saga
+ *  - scumm
+ *  - sword1
+ *  - sword2
+ *  - touche
+ *  - tucker
+ */
+
+#ifndef SOUND_VORBIS_H
+#define SOUND_VORBIS_H
+
+#include "common/types.h"
+#include "common/scummsys.h"
+
+#ifdef USE_VORBIS
+
+namespace Common {
+	class SeekableReadStream;
+}
+
+namespace Audio {
+
+class AudioStream;
+class SeekableAudioStream;
+
+/**
+ * Create a new SeekableAudioStream from the Ogg Vorbis data in the given stream.
+ * Allows for seeking (which is why we require a SeekableReadStream).
+ *
+ * @param stream			the SeekableReadStream from which to read the Ogg Vorbis data
+ * @param disposeAfterUse	whether to delete the stream after use
+ * @return	a new SeekableAudioStream, or NULL, if an error occured
+ */
+SeekableAudioStream *makeVorbisStream(
+	Common::SeekableReadStream *stream,
+	DisposeAfterUse::Flag disposeAfterUse);
+
+} // End of namespace Audio
+
+#endif // #ifdef USE_VORBIS
+#endif // #ifndef SOUND_VORBIS_H