multimediacommscontroller/mmccjitterbuffer/inc/mccjitterbufferimpl.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 19 Aug 2010 10:18:22 +0300
branchRCL_3
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Revision: 201031 Kit: 201033
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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 MCCJITTERBUFFERIMPL_H
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#define MCCJITTERBUFFERIMPL_H
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//  INCLUDES
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#include <e32base.h>
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#include "mccinternalcodecs.h"
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#include "mmccevents.h"
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// FORWARD DECLARATIONS
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class CMccCnGenerator;
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class CMMFDevSound;
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class TMccJitterBufferEventData;
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class MAsyncEventHandler;
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class MDataSink;
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class MJitterBufferObserver;
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// CLASS DECLARATION
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/**
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*  Jitter buffer element including packet received.
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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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NONSHARABLE_CLASS( TJitterBufferElement )
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	{
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public: // Constructor
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    inline TJitterBufferElement() : iDataFrame( NULL ), 
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        iSequenceNumber( -1 ), iStamp( -1 )
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        {   };
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public: // Data members
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    // Data
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    CMMFDataBuffer* iDataFrame;
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    // Data packet number
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    TInt64 iSequenceNumber;
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	TInt64 iStamp;
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    /**
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	* Compares two elements based on their sequence number
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	* @since Series 60 3.0
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	* @param aElem1 First element
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	* @param aElem2 Second element
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	* @return TInt
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	*/
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	static TInt CompareSeqNum( const TJitterBufferElement& aElem1, 
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	        const TJitterBufferElement& aElem2 );
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    /**
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	* Compares two elements based on their stamps
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	* @since Series 60 3.0
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	* @param aElem1 First element
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	* @param aElem2 Second element
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	* @return TInt
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	*/
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	static TInt CompareStamp( const TJitterBufferElement& aElem1, 
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	        const TJitterBufferElement& aElem2 );
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	};
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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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NONSHARABLE_CLASS( CMccJitterBufferImpl ) : public CBase
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    {
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public: // Enumerations
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    enum TMccJitterBufferImplState
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        {
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        EUnknown,
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        EIdle,
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        EPlaying,
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        EBuffering,
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        EDetermining
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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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    static CMccJitterBufferImpl* NewL( MJitterBufferObserver* aObserver = NULL );
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    /**
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    * Destructor.
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    */
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    virtual ~CMccJitterBufferImpl();
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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 parameters
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    * @return void
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    */    
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    void SetupL( TInt aPlayoutThreshold, 
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                 const TMccCodecInfo& aCInfo, 
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                 CMMFDevSound& aDevSound,
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                 MAsyncEventHandler* aEventHandler,
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                 TUint32 aEndpointId );
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    /**
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    * Reset buffer 
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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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    * @param aNotifyUser ETrue, if state change should be notified
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    * @return void
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    */
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	void ResetBuffer( TBool aPlayTone = ETrue, TBool aNotifyUser = ETrue );
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    /**
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    * Add DataFrame to buffer
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    * @since Series 60 3.0
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    * @param aBuffer Buffer to read data from
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    * @return void
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    */
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	void AddDataFrameL( CMMFBuffer* aDataBuffer );
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    /**
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    * Get DataFrame from buffer 
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    * @since Series 60 3.0
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    * @param aBuffer Buffer to write data to
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    * @return void
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    */	
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	void GetDataFrameL( CMMFBuffer* aBuffer );
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    /**
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    * Get Current Codec 
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    * @since Series 60 3.0
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    * @param None
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    * @return TFourCC
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    */
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	TFourCC CurrentCodec() const;
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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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	void DelayUpL();
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    /**
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    * Decreases jitter buffer delay
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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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	void DelayDownL();
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    /**
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    * ?Description 
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    * @since Series 60 3.0
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    * @param None
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    * @return TTimeIntervalMicroSeconds32
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    */
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	TTimeIntervalMicroSeconds32 CalculateDelay() const;
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    /**
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    * Get the length of jitter buffer, in terms of number of packets.
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    * @since Series 60 3.0
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    * @param none
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    * @return buffer lenght.
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    */
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    TInt BufferLength() const;
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    /**
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    * Fills the given event with statistics of the jitterbuffer
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    * @since Series 60 3.0
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    * @param aEvent Event into which set the statistics
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    * @return void
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    */
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    void GenerateStatistics( TMccJitterBufferEventData& aEvent ) const;
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private:
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    /**
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    * C++ default constructor.
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    */
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    CMccJitterBufferImpl( 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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    * Is sequence number wrapped around TUint16 65535->0
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    * @since Series 60 3.0
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    * @param TInt aSeqNum1 is oldest packet sequence numper in buffer
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	* @param TInt aSeqNum2 is new element sequence numper to buffer
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    * @return detect the wrap-around condition.
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    */   
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    TBool IsSeqNumWrappedAround( TInt64 aSeqNum1, TInt64 aSeqNum2 ) const;
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    /**
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    * Find Largest SequenceNumber 
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    * @since Series 60 3.0
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    * @param None
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    * @return TInt Largest sequence number
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    */
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	TInt FindLargestSeqNum() const;
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	/**
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    * Inserts a databuffer into the jitter buffer
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    * @since Series 60 3.0
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    * @param aBuffer Buffer containing the data
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    * @param aLargestSeqNum Largest sequence number returned by 
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    *                       FindLargestSeqNum()
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    * @param aFrameNumber   Sequence number of frame to be inserted.
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    * @return void
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    */	
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	void InsertBufferElement( const TDesC8& aBuffer, TInt64 aLargestSeqNum,
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	    TInt64 aFrameNumber );
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	/**
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    * Is jitter buffer full?
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    * @since Series 60 3.0
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    * @param none
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    * @return True if full.
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    */
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    TBool IsFull() const;
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    /**
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    * Is jitter buffer empty?
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    * @since Series 60 3.0
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    * @param none
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    * @return True if empty.
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    */
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    TBool IsEmpty() const;
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    void HandleNotifications( TBool aBuffering );
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    void CheckThresholdBufferLength( TInt& aBufferLength, const TInt aTreshhold ) const;
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    void SendStreamEventToClient( TMccEventType aEventType, 
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                                  TBool aAllEndpoints = EFalse );
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    void SetBufferState( TMccJitterBufferImplState aState );
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    TMccJitterBufferImplState BufferState() const;
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private: // Data
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	// Playout thresholds for storing the original threshold and current
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	// threshold
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	TInt iCurrentPlayThreshold;
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	TInt iOriginalPlayThreshold;
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	// Number of packets in buffer
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	TInt iPacketsInBuffer;
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	// Jitterbuffer RArray.
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	RArray<TJitterBufferElement> iBuffer;
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	// instance of comfortnoise generator.
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	CMccCnGenerator* iCnGenerator;
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	// Sequence number of packet that is played out last time
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	TInt64 iLastGetSeqNum;
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    // Function object for jitterbuffer sorting
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    TLinearOrder<TJitterBufferElement> iBufStampSorter;
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    // Function object for jitterbuffer sorting
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    TLinearOrder<TJitterBufferElement> iBufSequenceSorter;
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    // Number of frames arrived late
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    TUint iNumOfLateFrames;
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    // Count of sequential late frames
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    TUint iNumOfSequentialLateFrames;
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    // Number of frames totally lost
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    TUint iFramesLost;
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    // Number of frames received
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    TUint iFramesReceived;
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    // Number of frames removed by adaptation or because of overflows
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    TUint iFramesRemoved;
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    // Number of frames played
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    TUint iFramesPlayed;
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    // Codec information
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    TMccCodecInfo iCInfo;
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    // Codec frame size
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    TInt iFrameSize;
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    // Codec frame time
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    TInt iFrameTime;
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    // Increment in frame sequence number
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    TUint iSeqNumIncrement;
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    TBool iPlay;
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    TInt iInactivityTime;
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    MJitterBufferObserver* iObserver;
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    TUint iOverflowCounter;
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	TInt iPlayToneInterval;
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    TTime iTonePlayTime;
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    MAsyncEventHandler* iEventHandler;
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    // Endpoint identifier
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    TUint32 iEndpointId;
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    TMccEvent iMccEvent;
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    TBool iNotifyUser;
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    TMccJitterBufferImplState iBufferState;
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    TMccEventType iLatestNotifiedEvent;
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    TInt iSampleRate;
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    /**
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     * Flag to determine whether frame removal or frame drop should be done in
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     * overflow situation.
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     */
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    TBool iDropNextFrame;
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42
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    // Saved bufLenMultiplier from SetupL()
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    TInt iBufLenMultiplier;
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0
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    private:
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        #ifdef TEST_EUNIT
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            friend class UT_CMccJitterBufferImpl;
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        #endif   
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    };
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#endif  //MCCJITTERBUFFERIMPL_H
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// End of File
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