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diff --git a/engines/zvision/zork_avi_decoder.h b/engines/zvision/zork_avi_decoder.h
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+++ b/engines/zvision/zork_avi_decoder.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.
+ *
+ *
+ */
+
+#ifndef ZORK_AVI_DECODER_H
+#define ZORK_AVI_DECODER_H
+
+#include "video/avi_decoder.h"
+ 
+namespace ZVision {
+
+class ZorkAVIDecoder : public Video::AVIDecoder {
+public:
+	ZorkAVIDecoder(Audio::Mixer::SoundType soundType = Audio::Mixer::kPlainSoundType) :
+	  Video::AVIDecoder(soundType) {}
+
+	  virtual ~ZorkAVIDecoder() {}
+
+private:
+	class ZorkAVIAudioTrack : public Video::AVIDecoder::AVIAudioTrack {
+	public:
+		ZorkAVIAudioTrack(const AVIStreamHeader &streamHeader, const PCMWaveFormat &waveFormat, Audio::Mixer::SoundType soundType) :
+			Video::AVIDecoder::AVIAudioTrack(streamHeader, waveFormat, soundType) {}
+		virtual ~ZorkAVIAudioTrack() {}
+
+		void queueSound(Common::SeekableReadStream *stream);
+	};
+
+	Video::AVIDecoder::AVIAudioTrack *createAudioTrack(Video::AVIDecoder::AVIStreamHeader sHeader, Video::AVIDecoder::PCMWaveFormat wvInfo);
+
+private:
+	// Audio Codecs
+	enum {
+		kWaveFormatZorkPCM = 17	// special Zork PCM audio format (clashes with MS IMA ADPCM)
+	};
+};
+
+} // End of namespace ZVision
+ 
+#endif