/*+
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description:    +
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*+
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*/+
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#ifndef MMCEDTMFOBSERVER_H+
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#define MMCEDTMFOBSERVER_H+
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+
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// INCLUDES+
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#include <e32base.h>+
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+
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// FORWARD DECLARATIONS+
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class CMceSession;+
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class CMceAudioStream;+
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class CMceMediaSource;+
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+
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// CLASS DECLARATION+
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+
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/**+
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*  An interface to be implemented by users of MCE if they wish to receive+
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*  DTMF related notifications.+
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*+
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*  @lib mceclient.lib+
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*/+
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class MMceDtmfObserver+
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    {    +
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    public:+
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    +
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        enum TMceDtmfEvent+
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            {+
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            EDtmfSendStarted,+
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            EDtmfSendCompleted+
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            };+
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    +
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    public: // New functions+
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+
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        /**+
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        * Incoming DTMF tone received.+
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        * @param aSession Session that tone was received.+
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        * @param aStream Stream that tone was received.+
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        * @param aTone Received tone.+
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        */+
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        virtual void DtmfToneReceived( CMceSession& aSession,+
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                                       CMceAudioStream& aStream,+
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                                       const TChar& aTone ) = 0;+
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        +
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        /**+
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        * DTMF event received.+
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        * @param aSession Session that event was received.+
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        * @param aStream Stream that event was received.+
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        * @param aSource Source that event was received.+
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        * @param aEvent Received event.+
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        */+
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        virtual void DtmfEventReceived( CMceSession& aSession,+
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                                        CMceAudioStream& aStream,+
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                                        CMceMediaSource& aSource,+
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                                        TMceDtmfEvent aEvent ) = 0;+
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                                      		+
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        /**+
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        * DTMF error occured. If error occurs, DTMFs becomes+
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        * unavailable for that source.+
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        * @param aSession Session that event was received.+
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        * @param aStream Stream that event was received.+
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        * @param aStream Stream that event was received.+
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        * @param aError Error code.+
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        */+
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        virtual void DtmfErrorOccured( CMceSession& aSession,+
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                                       CMceAudioStream& aStream,+
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                                       CMceMediaSource& aSource,+
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                                       TInt aError ) = 0;+
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    };+
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+
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#endif+
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