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