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diff --git a/video/theora_decoder.h b/video/theora_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.
+ *
+ */
+
+#include "common/scummsys.h"	// for USE_THEORADEC
+
+#ifdef USE_THEORADEC
+
+#ifndef VIDEO_THEORA_DECODER_H
+#define VIDEO_THEORA_DECODER_H
+
+#include "common/rational.h"
+#include "video/video_decoder.h"
+#include "audio/mixer.h"
+#include "graphics/surface.h"
+
+#include <theora/theoradec.h>
+#include <vorbis/codec.h>
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Audio {
+class AudioStream;
+class QueuingAudioStream;
+}
+
+namespace Video {
+
+/**
+ *
+ * Decoder for Theora videos.
+ * Video decoder used in engines:
+ *  - sword25
+ */
+class TheoraDecoder : public VideoDecoder {
+public:
+	TheoraDecoder(Audio::Mixer::SoundType soundType = Audio::Mixer::kMusicSoundType);
+	virtual ~TheoraDecoder();
+
+	/**
+	 * Load a video file
+	 * @param stream  the stream to load
+	 */
+	bool loadStream(Common::SeekableReadStream *stream);
+	void close();
+
+protected:
+	void readNextPacket();
+
+private:
+	class TheoraVideoTrack : public VideoTrack {
+	public:
+		TheoraVideoTrack(const Graphics::PixelFormat &format, th_info &theoraInfo, th_setup_info *theoraSetup);
+		~TheoraVideoTrack();
+
+		bool endOfTrack() const { return _endOfVideo; }
+		uint16 getWidth() const { return _displaySurface.w; }
+		uint16 getHeight() const { return _displaySurface.h; }
+		Graphics::PixelFormat getPixelFormat() const { return _displaySurface.format; }
+		int getCurFrame() const { return _curFrame; }
+		uint32 getNextFrameStartTime() const { return (uint32)(_nextFrameStartTime * 1000); }
+		const Graphics::Surface *decodeNextFrame() { return &_displaySurface; }
+
+		bool decodePacket(ogg_packet &oggPacket);
+		void setEndOfVideo() { _endOfVideo = true; }
+
+	private:
+		int _curFrame;
+		bool _endOfVideo;
+		Common::Rational _frameRate;
+		double _nextFrameStartTime;
+
+		Graphics::Surface _surface;
+		Graphics::Surface _displaySurface;
+
+		th_dec_ctx *_theoraDecode;
+
+		void translateYUVtoRGBA(th_ycbcr_buffer &YUVBuffer);
+	};
+
+	class VorbisAudioTrack : public AudioTrack {
+	public:
+		VorbisAudioTrack(Audio::Mixer::SoundType soundType, vorbis_info &vorbisInfo);
+		~VorbisAudioTrack();
+
+		Audio::Mixer::SoundType getSoundType() const { return _soundType; }
+
+		bool decodeSamples();
+		bool hasAudio() const;
+		bool needsAudio() const;
+		void synthesizePacket(ogg_packet &oggPacket);
+		void setEndOfAudio() { _endOfAudio = true; }
+
+	protected:
+		Audio::AudioStream *getAudioStream() const;
+
+	private:
+		// single audio fragment audio buffering
+		int _audioBufferFill;
+		ogg_int16_t *_audioBuffer;
+
+		Audio::Mixer::SoundType _soundType;
+		Audio::QueuingAudioStream *_audStream;
+
+		vorbis_block _vorbisBlock;
+		vorbis_dsp_state _vorbisDSP;
+
+		bool _endOfAudio;
+	};
+
+	void queuePage(ogg_page *page);
+	int bufferData();
+	bool queueAudio();
+	void ensureAudioBufferSize();
+
+	Common::SeekableReadStream *_fileStream;
+
+	Audio::Mixer::SoundType _soundType;
+
+	ogg_sync_state _oggSync;
+	ogg_page _oggPage;
+	ogg_packet _oggPacket;
+
+	ogg_stream_state _theoraOut, _vorbisOut;
+	bool _hasVideo, _hasAudio;
+
+	vorbis_info _vorbisInfo;
+
+	TheoraVideoTrack *_videoTrack;
+	VorbisAudioTrack *_audioTrack;
+};
+
+} // End of namespace Video
+
+#endif
+
+#endif