multimediacommscontroller/mmccjitterbuffer/inc/mccjitterbuffer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:04:58 +0200
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/*
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* Copyright (c) 2004-2007 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:    Jitter buffer for audio frames.
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*  Interface   : 
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*
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*/
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#ifndef MCCJITTERBUFFER_H
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#define MCCJITTERBUFFER_H
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//  INCLUDES
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#include <e32base.h>
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#include <mmf/server/mmfdatasink.h>
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#include <mmf/server/mmfdatasource.h>
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// FORWARD DECLARATIONS
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class CMccJitterBufferImpl;
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class TMccCodecInfo;
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class MJitterBufferObserver;
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// CLASS DECLARATION
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/**
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*  Jitter buffer.
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*
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*  @lib MMccJitterBuffer.lib
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*  @since Series 60 3.0
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*/
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class CMccJitterBuffer : public CBase, public MDataSink, public MDataSource
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    {
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    private:
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        /**
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        * Jitterbuffer states
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        */
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        enum TJitterBufferState 
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    	    {
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            EJBufStopped,
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            EJBufPrimed,
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            EJBufPlaying,
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            EJBufPaused
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            };
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    public: // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        */
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        IMPORT_C static CMccJitterBuffer* NewL( MJitterBufferObserver* aObserver = NULL );
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        /**
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        * Destructor.
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        */
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        virtual ~CMccJitterBuffer();
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    public: // Methods
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        /**
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        * Setup Jitterbuffer
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        * @since Series 60 3.0
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        * @param aPayloadSize Initial size of the jitterbuffer in milliseconds
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        * @param aPlayoutThreshold Initial playout threshold of the jitterbuffer
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        * @param aCInfo Codec information class to pass info about used codec
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        * @return void
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        */    
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        IMPORT_C void SetupL( TInt aBufferSize, TInt aPlayoutThreshold, 
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                const TMccCodecInfo& aCInfo );
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        /**
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        * Reset Jitterbuffer
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        * @since Series 60 3.0
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        * @param aPlayTone ETrue, if tone is to played
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        * @return void
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        */    
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        IMPORT_C void ResetBuffer( TBool aPlayTone = ETrue );
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        /**
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        * Delay Down
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        * @since Series 60 3.0
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        * @param none
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        * @return void
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        */    
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    	IMPORT_C void DelayDownL();
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        /**
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        * Delay Up
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        * @since Series 60 3.0
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        * @param none
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        * @return void
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        */    
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    	IMPORT_C void DelayUpL();
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    	/**
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        * Add datasink. This should be the MMF Audio Output MDataSink plug-in 
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        * @since Series 60 3.0
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        * @param [input] aSink Sink to be added
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        * @return void
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        */
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        IMPORT_C void AddDataSinkL( MDataSink* aSink );
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    	/**
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        * Add a datasource. This should be the Mcc DL Datapath.
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        * @since Series 60 3.0
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        * @param [input] aSource Source to be added
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        * @return void
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        */
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        IMPORT_C void AddDataSourceL( MDataSource* aSource );
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    	/**
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        * Returns the current datasink pointer
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        * @since Series 60 3.0
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        * @param none
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        * @return MDataSink
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        */
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    	IMPORT_C MDataSink* GetDataSink();
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    public: // Functions from base classes    
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        /**
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        * From MDataSink
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        */
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    	TInt SetSinkDataTypeCode( TFourCC aCodec, TMediaId aMedia );	     
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        /**
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        * From MDataSource
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        */
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    	TInt SetSourceDataTypeCode( TFourCC aCodec, TMediaId aMedia );        
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        /**
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        * From MDataSink
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        */
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    	TFourCC SinkDataTypeCode( TMediaId aMediaId ); 
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        /**
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        * From MDataSource
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        */
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    	TFourCC SourceDataTypeCode( TMediaId aMediaId ); 
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        /**
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        * From MDataSink
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        */
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    	void ConstructSinkL( const TDesC8& aInitData );	
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        /**
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        * From MDataSource
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        */
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    	void ConstructSourceL( const TDesC8& aInitData );	
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        /**
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        * From MDataSink
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        */
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    	TInt SinkThreadLogon( MAsyncEventHandler& aEventHandler );
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        /**
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         * From MDataSource
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        */	
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    	TInt SourceThreadLogon( MAsyncEventHandler& aEventHandler );
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        /**
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        * From MDataSink
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        */	
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    	void SinkThreadLogoff();
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        /**
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        * From MDataSink
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        */
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    	void SinkPrimeL(); 
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        /**
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        * From MDataSink
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        */                       
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    	void SinkPlayL();
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        /**
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        * From MDataSink
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        */
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    	void SinkPauseL();	 
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        /**
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        * From MDataSink
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        */
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    	void SinkStopL(); 		 
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        /**
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        * From MDataSink
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        */
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    	TBool CanCreateSinkBuffer();
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        /**
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        * From MDataSource
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        */
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    	TBool CanCreateSourceBuffer();	
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        /**
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        * From MDataSource
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        */
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    	CMMFBuffer* CreateSourceBufferL( TMediaId aMediaId, TBool &aReference );		
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        /**
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        * From MDataSink
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        */
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    	CMMFBuffer* CreateSinkBufferL( TMediaId aMediaId, TBool &aReference );
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        /**
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        * From MDataSource
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        */	
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        void FillBufferL( CMMFBuffer* aBuffer, MDataSink* aConsumer,
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                TMediaId aMediaId );
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        /**
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        * From MDataSink
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        */	
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    	void EmptyBufferL( CMMFBuffer* aBuffer, MDataSource* aSupplier,
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                TMediaId aMediaId ); 	                    		
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        /**
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        * From MDataSink
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        */
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        void BufferFilledL( CMMFBuffer* aBuffer );
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        /**
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        * From MDataSource
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        */
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        void BufferEmptiedL( CMMFBuffer* aBuffer );
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        /**
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        * From MDataSink
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        */
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        void NegotiateL( MDataSource& aDataSource );
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    private:	
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        /**
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        * C++ default constructor.
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        */
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        CMccJitterBuffer( MJitterBufferObserver* aObserver );	
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL();
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    private: // New functions
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    	/**
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        * Send jitter buffer event.
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        * @return void
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        */
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    	void SendJitterBufferEventToClient();
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    private: // Data
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        // Datasink
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        MDataSink* iDataSink;
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    	// Datasource
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        MDataSource* iDataSource;
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    	// Jitter buffer Implementation
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    	CMccJitterBufferImpl* iBufferImpl;
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        // Pointer to databuffer
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        CMMFBuffer* iSinkBuffer;
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    	// Jitterbuffer state
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    	TJitterBufferState iState;
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        // ETrue if MMF owns the databuffer
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    	TBool iSnkBufRef;
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        // Asynchronous event handler
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        MAsyncEventHandler* iEventHandler;
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        // Frames played
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        TUint iPlayedFrames;
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        MJitterBufferObserver* iObserver;
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        // Current request size of the buffer
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        TInt iRequestSize;
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        // Friend class for EUNIT tests
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        #ifdef TEST_EUNIT
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            friend class UT_CMccJitterBuffer;
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        #endif
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    };
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#endif  //MCCJITTERBUFFER_H
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// End of File