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diff --git a/audio/mods/mod_xm_s3m.h b/audio/mods/mod_xm_s3m.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.
+ *
+ */
+
+/*
+ * This code is based on IBXM mod player
+ *
+ * Copyright (c) 2015, Martin Cameron
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the
+ * following conditions are met:
+ *
+ * * Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the
+ * following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the
+ * above copyright notice, this list of conditions and the
+ * following disclaimer in the documentation and/or other
+ * materials provided with the distribution.
+ *
+ * * Neither the name of the organization nor the names of
+ *  its contributors may be used to endorse or promote
+ *  products derived from this software without specific
+ *  prior written permission.
+
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef AUDIO_MODS_MOD_XM_S3M_H
+#define AUDIO_MODS_MOD_XM_S3M_H
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Audio {
+
+class AudioStream;
+
+/*
+ * Factory function for ModXmS3mStream streams. Reads all data from the
+ * given ReadStream and creates an AudioStream from this. No reference
+ * to the 'stream' object is kept, so you can safely delete it after
+ * invoking this factory.
+ *
+ * @param stream			the ReadStream from which to read the tracker sound data
+ * @param disposeAfterUse	whether to delete the stream after use
+ * @param rate				sample rate
+ * @param interpolation		interpolation effect level
+ */
+AudioStream *makeModXmS3mStream(Common::SeekableReadStream *stream,
+		DisposeAfterUse::Flag disposeAfterUse,
+		int rate = 48000, int interpolation = 0);
+
+} // End of namespace Audio
+
+#endif