/*

* Copyright (c) 2005 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:    Base class for incoming SRTP stream states

*

*/

#ifndef TSRTPSTREAMINSTATEBASE_H

#define TSRTPSTREAMINSTATEBASE_H

// INCLUDES

#include <e32std.h>

#include "tsrtpstreamstatebase.h"

// FORWARD DECLARATIONS

class MSRTPStreamInContext;

class MSRTPCryptoHandlerContext;

class MSRTPCryptoHandlerContextRTP;

class MSRTPCryptoHandlerContextRTCP;

// CLASS DECLARATION

class TSRTPStreamInStateBase : public TSRTPStreamStateBase

	{

	protected:	// Constructors and destructor

		TSRTPStreamInStateBase(MSRTPStreamInContext& aStreamContext,

		    MSRTPCryptoHandlerContextRTP& aCryptoHandlerRTPContext,

		    MSRTPCryptoHandlerContextRTCP& aCryptoHandlerRTCPContext);

	public: // New methods

        /**

        * virtual function for unprotecting encrypted RTP packet.

        * implemented in substates of TSRTPStreamInStateBase.

        * @param aPacket encrypted packet

        * @leave KErrNone if success, system-wide error code otherwise        

        * @return HBufC8* decrypted packet

        */                              

		virtual HBufC8* DoUnprotectSrtpL(const TDesC8& aPacket)=0;

        /**

        * virtual function for unprotecting encrypted RTCP packet.

        * implemented in substates of TSRTPStreamInStateBase.

        * @param aPacket encrypted packet

        * @leave KErrNone if success, system-wide error code otherwise        

        * @return HBufC8* decrypted packet

        */                              

		virtual HBufC8* DoUnprotectSrtcpL(const TDesC8& aPacket)=0;

	private: // Constructors

		/// Default constructor. Not implemented.

		TSRTPStreamInStateBase();

	protected: // Data

	    /* 

	    * interface for a receiver stream for changing state

	    */

		MSRTPStreamInContext& iStreamContext;

	};

#endif // TSRTPStreamInStateBase_H