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diff --git a/indra/llaudio/llaudioengine_fmodstudio.h b/indra/llaudio/llaudioengine_fmodstudio.h
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+/**
+ * @file audioengine_fmodstudio.h
+ * @brief Definition of LLAudioEngine class abstracting the audio
+ * support as a FMODSTUDIO implementation
+ *
+ * $LicenseInfo:firstyear=2020&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2020, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_AUDIOENGINE_FMODSTUDIO_H
+#define LL_AUDIOENGINE_FMODSTUDIO_H
+
+#include "llaudioengine.h"
+#include "llwindgen.h"
+
+//Stubs
+class LLAudioStreamManagerFMODSTUDIO;
+namespace FMOD
+{
+    class System;
+    class Channel;
+    class ChannelGroup;
+    class Sound;
+    class DSP;
+}
+typedef struct FMOD_DSP_DESCRIPTION FMOD_DSP_DESCRIPTION;
+
+//Interfaces
+class LLAudioEngine_FMODSTUDIO : public LLAudioEngine
+{
+public:
+    LLAudioEngine_FMODSTUDIO(bool enable_profiler);
+    virtual ~LLAudioEngine_FMODSTUDIO();
+
+    // initialization/startup/shutdown
+    virtual bool init(void *user_data, const std::string &app_title);
+    virtual std::string getDriverName(bool verbose);
+    virtual LLStreamingAudioInterface* createDefaultStreamingAudioImpl() const;
+    virtual void allocateListener();
+
+    virtual void shutdown();
+
+    /*virtual*/ bool initWind();
+    /*virtual*/ void cleanupWind();
+
+    /*virtual*/void updateWind(LLVector3 direction, F32 camera_height_above_water);
+
+    typedef F32 MIXBUFFERFORMAT;
+
+    FMOD::System *getSystem()               const {return mSystem;}
+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);
+
+    bool mInited;
+
+    LLWindGen<MIXBUFFERFORMAT> *mWindGen;
+
+    FMOD_DSP_DESCRIPTION *mWindDSPDesc;
+    FMOD::DSP *mWindDSP;
+    FMOD::System *mSystem;
+    bool mEnableProfiler;
+
+public:
+    static FMOD::ChannelGroup *mChannelGroups[LLAudioEngine::AUDIO_TYPE_COUNT];
+};
+
+
+class LLAudioChannelFMODSTUDIO : public LLAudioChannel
+{
+public:
+    LLAudioChannelFMODSTUDIO(FMOD::System *audioengine);
+    virtual ~LLAudioChannelFMODSTUDIO();
+
+protected:
+    /*virtual*/ void play();
+    /*virtual*/ void playSynced(LLAudioChannel *channelp);
+    /*virtual*/ void cleanup();
+    /*virtual*/ bool isPlaying();
+
+    /*virtual*/ bool updateBuffer();
+    /*virtual*/ void update3DPosition();
+    /*virtual*/ void updateLoop();
+
+    void set3DMode(bool use3d);
+protected:
+    FMOD::System *getSystem()   const {return mSystemp;}
+    FMOD::System *mSystemp;
+    FMOD::Channel *mChannelp;
+    S32 mLastSamplePos;
+};
+
+
+class LLAudioBufferFMODSTUDIO : public LLAudioBuffer
+{
+public:
+    LLAudioBufferFMODSTUDIO(FMOD::System *audioengine);
+    virtual ~LLAudioBufferFMODSTUDIO();
+
+    /*virtual*/ bool loadWAV(const std::string& filename);
+    /*virtual*/ U32 getLength();
+    friend class LLAudioChannelFMODSTUDIO;
+protected:
+    FMOD::System *getSystem()   const {return mSystemp;}
+    FMOD::System *mSystemp;
+    FMOD::Sound *getSound()     const{ return mSoundp; }
+    FMOD::Sound *mSoundp;
+};
+
+
+#endif // LL_AUDIOENGINE_FMODSTUDIO_H