tsrc/mceclientstub/inc/mcemediastream.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:44:37 +0200
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/*
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* Copyright (c) 2005 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 CMCEMEDIASTREAM_H
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#define CMCEMEDIASTREAM_H
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// INCLUDES
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#include <e32base.h>
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// DATA TYPES
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typedef TUint TMceMediaType;
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// FORWARD DECLARATIONS
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class CMceComMediaStream;
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class TMceFactory;
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class TMceMediaStreamFactory;
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class RWriteStream;
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class RReadStream;
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class CDesC8Array;
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class CMceSession;
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class TMceIds;
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class TMceEvent;
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class TMceMediaId;
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class CMceManager;
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class CMceSession;
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class CMceMediaSource;
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class CMceMediaSink;
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class MMceComSerializationContext;
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class MDesC8Array;
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// CLASS DECLARATION
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/**
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* Base class for MCE media streams.
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*
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* MCE Media stream represents stream of data negotiated between two terminals.
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* Streams may transfer any data.
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*
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* Enabling or disabling of a stream is not a local operation, but it requires
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* always signalling. Thus, these operation require always to be completed by
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* calling CMceSession::UpdateL() function.
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*
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*  @lib mceclient.lib
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*/
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class CMceMediaStream : public CBase
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	{
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    public: // Stream states
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        enum TState
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            {
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            EUninitialized,       // Stream is created
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            EInitialized,         // Stream is initialized
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            EBuffering,           // Stream is buffering
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            EIdle,                // Stream is not receiving RTP
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            EStreaming,           // Stream is streaming
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            EDisabled,            // Stream is explicitly disabled
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            ENoResources,         // Stream has no needed resources to stream
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            ETranscodingRequired, // Stream requires non-realtime transcoding
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            ETranscoding          // Stream is transcoding in non-realtime
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            };
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	public: // Destructor
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	    /**
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	    * Destructor.
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	    */
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		IMPORT_C ~CMceMediaStream();
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	public: // Functions
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        /**
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        * Gets the state of the stream.
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        * @return the current state of the stream
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        */
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        IMPORT_C CMceMediaStream::TState State() const;
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	    /**
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	    * Returns the type of the stream.
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	    * @return The type of the stream.
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	    */
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		IMPORT_C TMceMediaType Type() const;
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	    /**
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		* Configures media stream by updating SDP media lines. 
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		* In order to get complete update, whole session must be 
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		* updated causing sending of re-invite.
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	    * @param aMediaSDPLines, application specific SDP media lines for
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		*		 the stream. Ownership is transferred.
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	    */
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		IMPORT_C void SetMediaAttributeLinesL( CDesC8Array* aMediaSDPLines );
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		/**
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		* Gets attribute lines of the media.
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		* @return array of media attribute lines, owneship is transferred.
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		*/
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		IMPORT_C MDesC8Array* MediaAttributeLinesL();
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		/** 
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	    * Sets local media port
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	    * @param aLocalMediaPort, local port for the media
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	    */
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	    IMPORT_C void SetLocalMediaPortL(TUint aLocalMediaPort); 
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	    /**
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	    * Gets the local media port.
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	    * @return Local port used for media.
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	    */
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	    IMPORT_C TUint LocalMediaPort() const;
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	    /**
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	    * Gets the session this stream belongs to, if exists. The
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	    * ownership is not transfered.
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	    * @return Session object
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	    */
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		IMPORT_C CMceSession* Session() const;
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	public: // Local stream control
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	    /**
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	    * Enables streaming explicitly.
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	    */
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	    virtual void EnableL(); 
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	    /**
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	    * Disables streaming explicitly.
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	    */
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		virtual void DisableL(); 
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		/**
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	    * Returns the state of the stream.
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	    * @return ETrue if enabled, EFalse if disabled.
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	    */
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    	IMPORT_C TBool IsEnabled() const;
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    public: // Source and sink functions
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        /**
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        * Adds source to the stream. CMceMediaStream can only
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        * have one source at a time. Ownership of passed source is transferred.
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        * However, the same source can be also passed to other streams resulting
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        * that streams share ownership of the source. Passing NULL source will
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        * remove source from stream.
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        * In some cases the source might contain a codec. The codec is derived
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        * to the stream when such source is added to the stream. 
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        * Derived codec will get automatically highest preference.
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        * @param aSource source to be added to the stream; ownership is 
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        *        transferred
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        */
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        IMPORT_C void SetSourceL( CMceMediaSource* aSource );
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        /**
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        * Adds sink to the stream. CMceMediaStream can have
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        * many sinks at a time. Ownership of passed sink is transferred.
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        * However, the same sink can be also passed to other streams resulting
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        * that streams share ownership of the sink.
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        * @param aSink sink to be added to the stream; ownership is transferred
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        */
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        IMPORT_C void AddSinkL( CMceMediaSink* aSink );
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        /**
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        * Gets source of the stream. Returns NULL if source is not set.
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        * @return source of the stream; ownership is not transferred
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        */
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        IMPORT_C CMceMediaSource* Source() const;
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        /**
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        * Gets array of sinks of the stream.
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        * @return array of sinks
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        */
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        IMPORT_C const RPointerArray<CMceMediaSink>& Sinks() const;
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        /**
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        * Removes sink from the stream.
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        * @post aSink cannot be used anymore and contents of 
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        *       previously returned sink array (CMceMediaStream::Sinks())
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        *       are not anymore valid
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        * @param aSink sink to be removed from the stream
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        */
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        IMPORT_C void RemoveSinkL( CMceMediaSink& aSink );
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    public: // Binding opposite way stream
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        /**
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        * Binds opposite direction stream to this stream.
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        * @param aStream another stream to be bind to the stream; 
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        *        ownership is transferred
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        */
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        IMPORT_C void BindL( CMceMediaStream* aStream );
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        /**
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        * Gets opposite direction stream of this stream.
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        * @return opposite direction stream
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        */
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        IMPORT_C CMceMediaStream& BoundStreamL() const;
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        /**
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        * Checks if opposite direction stream is set.
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        * @return ETrue if opposite direction stream is set; 
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        *         otherwise EFalse
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        */
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        IMPORT_C TBool BoundStream() const;
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	public: //internal
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	    /**
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	    * Checks if this is binder (biding owner)
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	    * @return ETrue if this is binder (biding owner)
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	    */
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		TBool Binder() const;
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	    /**
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	    * Initializes 
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	    * @param aParent the parent
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	    */
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	    virtual void InitializeL( CMceSession& aParent );
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	    /**
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	    * Initializes 
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	    * @param aManager the manager. Ownership is NOT transferred
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	    */
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	    virtual void InitializeL( CMceManager* aManager );
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	protected:
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	    /**
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	     * C++ default constructor.
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	     */
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		CMceMediaStream();
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	private:
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	    /**
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	    * Handles event
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	    * @param aEvent the event
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	    * @return status, if event was consumed or not or object needs update
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	    */
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	    TInt HandleEvent( TMceEvent& aEvent );
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	    /**
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	    * one-way bind
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	    * @param aStream another stream to be bind to the stream.
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	    */
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	    void DoBindL( CMceMediaStream* aStream );
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	    /**
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	    * Deletes sink
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	    * @param aIndex index of sink in the array
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	    */
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        void DeleteSink( TInt aIndex );
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	    /**
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	    * Deletes source
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	    */
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    	void DeleteSource();
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	protected: // NOT owned data
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	    /**
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	     * session
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	     */
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		CMceSession* iSession;
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	protected: // owned data
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	    /**
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	     * linked stream. Owned if iLinkOwner is ETrue
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	     */
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	    CMceMediaStream* iLinkedStream;	    
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    public: // stub data
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        /**
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	     * source
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	     */
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		CMceMediaSource* iSource;
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		/**
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	     * sinks
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	     */
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		RPointerArray<CMceMediaSink> iSinks;
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        TState iState;
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        TMceMediaType iType;
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        TBool iLinkOwner;
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        TBool iIsEnabled;
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        TUint iLocalMediaPort;
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        CDesC8Array* iMediaSDPLines;
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	};
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#endif