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diff --git a/indra/llaudio/lllistener_fmodstudio.h b/indra/llaudio/lllistener_fmodstudio.h
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+/** 
+ * @file listener_fmodstudio.h
+ * @brief Description of LISTENER class abstracting the audio support
+ * as an FMOD 3D 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_LISTENER_FMODSTUDIO_H
+#define LL_LISTENER_FMODSTUDIO_H
+
+#include "lllistener.h"
+
+//Stubs
+namespace FMOD
+{
+	class System;
+}
+
+//Interfaces
+class LLListener_FMODSTUDIO : public LLListener
+{
+public:
+    LLListener_FMODSTUDIO(FMOD::System *system);
+    virtual ~LLListener_FMODSTUDIO();
+    virtual void init();
+
+    virtual void translate(LLVector3 offset);
+    virtual void setPosition(LLVector3 pos);
+    virtual void setVelocity(LLVector3 vel);
+    virtual void orient(LLVector3 up, LLVector3 at);
+    virtual void commitDeferredChanges();
+
+    virtual void setDopplerFactor(F32 factor);
+    virtual F32 getDopplerFactor();
+    virtual void setRolloffFactor(F32 factor);
+    virtual F32 getRolloffFactor();
+protected:
+    FMOD::System *mSystem;
+    F32 mDopplerFactor;
+    F32 mRolloffFactor;
+};
+
+#endif
+
+