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diff --git a/linden/indra/llaudio/llaudioengine_fmod.h b/linden/indra/llaudio/llaudioengine_fmod.h
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+/** 
+ * @file audioengine_fmod.h
+ * @brief Definition of LLAudioEngine class abstracting the audio
+ * support as a FMOD 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_FMOD_H
+#define LL_AUDIOENGINE_FMOD_H
+
+#include "llaudioengine.h"
+#include "lllistener_fmod.h"
+#include "llwindgen.h"
+
+#include "fmod.h"
+
+class LLAudioStreamManagerFMOD;
+
+class LLAudioEngine_FMOD : public LLAudioEngine 
+{
+public:
+        LLAudioEngine_FMOD();
+        virtual ~LLAudioEngine_FMOD();
+
+        // initialization/startup/shutdown
+        virtual bool init(const S32 num_channels, void *user_data);
+        virtual std::string getDriverName(bool verbose);
+        virtual void allocateListener();
+
+        virtual void shutdown();
+
+        /*virtual*/ void initWind();
+        /*virtual*/ void cleanupWind();
+
+        /*virtual*/void updateWind(LLVector3 direction, F32 camera_height_above_water);
+
+#if LL_DARWIN
+        typedef S32 MIXBUFFERFORMAT;
+#else
+        typedef S16 MIXBUFFERFORMAT;
+#endif
+
+protected:
+        /*virtual*/ LLAudioBuffer *createBuffer(); // Get a free buffer, or flush an existing one if you have to.
+        /*virtual*/ LLAudioChannel *createChannel(); // Create a new audio channel.
+
+        /*virtual*/ void setInternalGain(F32 gain);
+protected:
+        static signed char F_CALLBACKAPI callbackMetaData(char* name, char* value, void* userdata);
+
+        //F32 mMinDistance[MAX_BUFFERS];
+        //F32 mMaxDistance[MAX_BUFFERS];
+
+        bool mInited;
+
+        // On Windows, userdata is the HWND of the application window.
+        void* mUserData;
+
+        LLWindGen<MIXBUFFERFORMAT> *mWindGen;
+};
+
+
+class LLAudioChannelFMOD : public LLAudioChannel
+{
+public:
+        LLAudioChannelFMOD();
+        virtual ~LLAudioChannelFMOD();
+
+protected:
+        /*virtual*/ void play();
+        /*virtual*/ void playSynced(LLAudioChannel *channelp);
+        /*virtual*/ void cleanup();
+        /*virtual*/ bool isPlaying();
+
+        /*virtual*/ bool updateBuffer();
+        /*virtual*/ void update3DPosition();
+        /*virtual*/ void updateLoop();
+
+protected:
+        int mChannelID;
+        S32 mLastSamplePos;
+};
+
+
+class LLAudioBufferFMOD : public LLAudioBuffer
+{
+public:
+        LLAudioBufferFMOD();
+        virtual ~LLAudioBufferFMOD();
+
+        /*virtual*/ bool loadWAV(const std::string& filename);
+        /*virtual*/ U32 getLength();
+        friend class LLAudioChannelFMOD;
+
+        void set3DMode(bool use3d);
+protected:
+        FSOUND_SAMPLE *getSample()      { return mSamplep; }
+protected:
+        FSOUND_SAMPLE *mSamplep;
+};
+
+
+#endif // LL_AUDIOENGINE_FMOD_H