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diff --git a/engines/cryomni3d/video/hnm_decoder.h b/engines/cryomni3d/video/hnm_decoder.h
new file mode 100644
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+++ b/engines/cryomni3d/video/hnm_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 CRYOMNI3D_VIDEO_HNM_DECODER_H
+#define CRYOMNI3D_VIDEO_HNM_DECODER_H
+
+#include "common/rational.h"
+#include "graphics/pixelformat.h"
+#include "video/video_decoder.h"
+#include "graphics/surface.h"
+#include "audio/audiostream.h"
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Video {
+
+/**
+ * Decoder for HNM videos.
+ *
+ * Video decoder used in engines:
+ *  - cryomni3d
+ */
+class HNMDecoder : public VideoDecoder {
+public:
+	HNMDecoder(bool loop = false);
+	virtual ~HNMDecoder();
+	bool loadStream(Common::SeekableReadStream *stream);
+	void readNextPacket();
+	void close();
+
+	void setRegularFrameDelay(uint32 regularFrameDelay) { _regularFrameDelay = regularFrameDelay; }
+
+private:
+	class HNM4VideoTrack : public VideoTrack {
+	public:
+		HNM4VideoTrack(uint32 width, uint32 height, uint32 frameSize, uint32 frameCount,
+		               uint32 regularFrameDelay);
+		~HNM4VideoTrack();
+
+		// When _frameCount is 0, it means we are looping
+		bool endOfTrack() const { return (_frameCount == 0) ? false : VideoTrack::endOfTrack(); }
+		uint16 getWidth() const { return _surface.w; }
+		uint16 getHeight() const { return _surface.h; }
+		Graphics::PixelFormat getPixelFormat() const { return _surface.format; }
+		int getCurFrame() const { return _curFrame; }
+		int getFrameCount() const { return _frameCount; }
+		uint32 getNextFrameStartTime() const { return _nextFrameStartTime; }
+		const Graphics::Surface *decodeNextFrame() { return &_surface; }
+		const byte *getPalette() const { _dirtyPalette = false; return _palette; }
+		bool hasDirtyPalette() const { return _dirtyPalette; }
+
+		/** Decode a video chunk. */
+		void decodePalette(Common::SeekableReadStream *stream, uint32 size);
+		void decodeInterframe(Common::SeekableReadStream *stream, uint32 size);
+		void decodeIntraframe(Common::SeekableReadStream *stream, uint32 size);
+
+		void restart() { _nextFrameDelay = -1; _nextNextFrameDelay = -1; }
+		void setFrameDelay(uint32 frameDelay);
+
+	private:
+		Graphics::Surface _surface;
+
+		uint32 _regularFrameDelay;
+		uint32 _nextFrameDelay;
+		uint32 _nextNextFrameDelay;
+		uint32 _nextFrameStartTime;
+
+		uint32 _frameCount;
+		int _curFrame;
+
+		byte _palette[256 * 3];
+		mutable bool _dirtyPalette;
+
+		byte *_frameBufferC;
+		byte *_frameBufferP;
+	};
+
+	class DPCMAudioTrack : public AudioTrack {
+	public:
+		DPCMAudioTrack(uint16 channels, uint16 bits, unsigned int sampleRate,
+		               Audio::Mixer::SoundType soundType);
+		~DPCMAudioTrack();
+
+		Audio::Timestamp decodeSound(Common::SeekableReadStream *stream, uint32 size);
+	protected:
+		Audio::AudioStream *getAudioStream() const { return _audioStream; }
+	private:
+		uint16 _channels;
+		uint16 _bits;
+		Audio::QueuingAudioStream *_audioStream;
+		bool _gotLUT;
+		uint16 _lut[256];
+		uint16 _lastSample;
+	};
+
+	bool _loop;
+
+	uint32 _regularFrameDelay;
+	// These two pointer are owned by VideoDecoder
+	HNM4VideoTrack *_videoTrack;
+	DPCMAudioTrack *_audioTrack;
+
+	Common::SeekableReadStream *_stream;
+};
+
+} // End of namespace Video
+
+#endif