--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/upnpavcontroller/upnprenderingstatemachine/inc/upnpvolumestatemachineobserver.h	Wed Nov 03 11:45:09 2010 +0200
@@ -0,0 +1,67 @@
+/*
+* Copyright (c) 2007,2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Observer for generic upnp volume state machine
+*
+*/
+
+
+#ifndef C_UPNPVOLUMESTATEMACHINEOBSERVER_H
+#define C_UPNPVOLUMESTATEMACHINEOBSERVER_H
+
+// INCLUDES
+#include <e32base.h>
+
+
+/**
+ * Class for receiving callbacks from
+ * CUPnPVolumeStateMachine
+ *
+ * @lib upnpavcontrollerhelper.lib
+ */
+class MUpnpVolumeStateMachineObserver
+    {
+
+public:
+
+    /**
+     * Indicates state machine has been synchronised with the renderer
+     * @param aError error that occurred during sync
+     */
+    virtual void VolumeSyncReady( TInt aError ) = 0;
+
+    /**
+     * Indicates volume state has been changed
+     * either by request or spontanelously.
+     * @param aError the error code
+     * @param aRenderingSession for playback commands
+     * @param aUserOriented ETrue if this responds to a request
+     */
+    virtual void VolumeChanged(
+        TInt aError, TInt aVolume, TBool aUserOriented ) = 0;
+
+    /**
+     * Indicates mute state has been changed
+     * either by request or spontanelously.
+     * @param aError the error code
+     * @param aMuteState current mute state
+     * @param aUserOriented ETrue if this responds to a request
+     */
+    virtual void MuteChanged(
+        TInt aError, TBool aMuteState, TBool aUserOriented ) = 0;
+
+    };
+
+
+#endif // C_UPNPVOLUMESTATEMACHINEOBSERVER_H
+