sl@0: // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: /**
sl@0:  @file
sl@0:  @internalComponent
sl@0:  @released
sl@0: */
sl@0: 
sl@0: #ifndef STREAMAGENTRESOLVER_H
sl@0: #define STREAMAGENTRESOLVER_H
sl@0: 
sl@0: #include <e32base.h>
sl@0: #include <ecom/ecom.h>
sl@0: #include "streamagentinfo.h"
sl@0: 
sl@0: namespace StreamAccess
sl@0: 	{
sl@0: 	
sl@0: 	class CStreamAgentInfo;
sl@0: 	
sl@0: 	/**
sl@0: 	 * Responsible for the identification of stream agent ECOM plug-in implementations and
sl@0: 	 * the selection of the most appropriate agent based on the key stream session description
sl@0: 	 * metadata and plug-in resource file information. 
sl@0: 	 */
sl@0: 	class CStreamAgentResolver : public CBase
sl@0: 		{
sl@0: 	public:
sl@0: 	
sl@0: 		/* Constructs a new instance of CStreamAgentResolver and pushs it onto the cleanup stack
sl@0: 		 * @return Pointer to the new CStreamAgentResolver object
sl@0: 		 */
sl@0: 		static CStreamAgentResolver* NewLC();
sl@0: 		
sl@0: 		/* Destructor
sl@0: 		 */
sl@0: 		~CStreamAgentResolver();
sl@0: 		
sl@0: 		/* Resolves a stream agent by the SDP (Session Description Protocol) media description
sl@0: 		 * of the key stream.
sl@0: 		 * @param aSdpKeyStream SDP media description of the key stream
sl@0: 		 * @return Reference to the CStreamAgentInfo instance for the chosen Stream Agent, capable
sl@0: 		 * of decoding the key stream. 
sl@0: 		 * NOTE: The lifetime of the returned reference is limited by the lifetime of the resolver. 
sl@0: 		 * The CStreamAgentInfo reference cannot be used after the CStreamAgentResolver object is
sl@0: 		 * destroyed.
sl@0: 		 * @leave KErrCANoAgent No stream agent can be found that supports the given SDP key management
sl@0: 		 * description
sl@0: 		 * @leave One of the system-wide error codes
sl@0: 		 */
sl@0: 		CStreamAgentInfo& ResolveSdpKeyStreamL(const CSdpMediaField& aSdpKeyStream) const;
sl@0: 		
sl@0: 	protected:
sl@0: 		
sl@0: 		/* Constructor
sl@0: 	 	*/
sl@0: 		CStreamAgentResolver();
sl@0: 	
sl@0: 		/* Second phase of construction for CStreamAgentResolver 
sl@0: 		 */
sl@0: 		void ConstructL();
sl@0: 		
sl@0: 	private:
sl@0: 	
sl@0: 		/* Constructs a list of information about plug-in implementations located
sl@0: 		 * by the ECOM framework that satisfy the stream agent interface.
sl@0: 		 */
sl@0: 		void BuildStreamAgentListL();
sl@0: 		
sl@0: 		/* Adds a new instance of a stream agent to the CStreamAgentInfo array
sl@0: 		 * @param aAgentInfo Registration data regarding the stream agent interface implementation,
sl@0: 		 * retrieved from the associated resource file
sl@0: 		 */
sl@0: 		void AddStreamAgentL(const CImplementationInformation& aAgentInfo);
sl@0: 			
sl@0: 		/* Cleanup Item Operation used when constructing the stream agent list via ECOM
sl@0: 		 * @param aArray Pointer to an RImplInfoPtrArray array which is used by ECOM to store 
sl@0: 		 * information about located stream agents implementations
sl@0: 		 */ 
sl@0: 		static void CleanAgentImplArray(TAny* aArray);
sl@0: 		
sl@0: 	private:
sl@0: 		
sl@0: 		/* Array of information regarding stream agent interface implementations located by ECOM
sl@0: 		 */
sl@0: 		RPointerArray<CStreamAgentInfo> iStreamAgentInfoArray;
sl@0: 		
sl@0: 		};
sl@0: 	} // namespace StreamAccess
sl@0: #endif /*STREAMAGENTRESOLVER_H*/