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diff --git a/linden/indra/llaudio/llaudioengine_openal.h b/linden/indra/llaudio/llaudioengine_openal.h
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+/**
+ * @file audioengine_openal.cpp
+ * @brief implementation of audio engine using OpenAL
+ * support as a OpenAL 3D implementation
+ *
+ *
+ * $LicenseInfo:firstyear=2002&license=viewergpl$
+ * 
+ * Copyright (c) 2002-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+
+#ifndef LL_AUDIOENGINE_OPENAL_H
+#define LL_AUDIOENGINE_OPENAL_H
+
+#include "llaudioengine.h"
+#include "lllistener_openal.h"
+#include "llwindgen.h"
+
+class LLAudioEngine_OpenAL : public LLAudioEngine
+{
+        public:
+                LLAudioEngine_OpenAL();
+                virtual ~LLAudioEngine_OpenAL();
+
+                virtual bool init(const S32 num_channels, void *user_data);
+                virtual std::string getDriverName(bool verbose);
+                virtual void allocateListener();
+
+                virtual void shutdown();
+
+                void setInternalGain(F32 gain);
+
+                LLAudioBuffer* createBuffer();
+                LLAudioChannel* createChannel();
+
+                /*virtual*/ void initWind();
+                /*virtual*/ void cleanupWind();
+                /*virtual*/ void updateWind(LLVector3 direction, F32 camera_altitude);
+
+        private:
+                void * windDSP(void *newbuffer, int length);
+                typedef S16 WIND_SAMPLE_T;
+                LLWindGen<WIND_SAMPLE_T> *mWindGen;
+                S16 *mWindBuf;
+                U32 mWindBufFreq;
+                U32 mWindBufSamples;
+                U32 mWindBufBytes;
+                ALuint mWindSource;
+                int mNumEmptyWindALBuffers;
+
+                static const int MAX_NUM_WIND_BUFFERS = 80;
+};
+
+class LLAudioChannelOpenAL : public LLAudioChannel
+{
+        public:
+                LLAudioChannelOpenAL();
+                virtual ~LLAudioChannelOpenAL();
+        protected:
+                /*virtual*/ void play();
+                /*virtual*/ void playSynced(LLAudioChannel *channelp);
+                /*virtual*/ void cleanup();
+                /*virtual*/ bool isPlaying();
+
+                /*virtual*/ bool updateBuffer();
+                /*virtual*/ void update3DPosition();
+                /*virtual*/ void updateLoop();
+
+                ALuint mALSource;
+                ALint mLastSamplePos;
+};
+
+class LLAudioBufferOpenAL : public LLAudioBuffer{
+        public:
+                LLAudioBufferOpenAL();
+                virtual ~LLAudioBufferOpenAL();
+
+                bool loadWAV(const std::string& filename);
+                U32 getLength();
+
+                friend class LLAudioChannelOpenAL;
+        protected:
+                void cleanup();
+                ALuint getBuffer() {return mALBuffer;}
+
+                ALuint mALBuffer;
+};
+
+#endif