multimediacommscontroller/mmccjitterbuffer/inc/mcccngenerator.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) 2004-2006 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:    Provides a comfort noise generator class
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*
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*/
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#ifndef MCCCNGENERATOR_H
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#define MCCCNGENERATOR_H
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#include <e32base.h>
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#include <mmf/common/mmfutilities.h>
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// FORWARD DECLARATIONS
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class CMMFDevSound;
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class CErrorConcealmentIntfc;
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/**
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* MCC Comfort noise generator
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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( CMccCnGenerator ) : public CBase
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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 CMccCnGenerator* NewL( const TFourCC& aAudioType, 
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                CMMFDevSound& aDevSound );
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        /**
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        * Destructor
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        */
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        virtual ~CMccCnGenerator();
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    public: // New functions
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        /**
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        * Generates an SID packet to given buffer
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        * @since Series 60 3.0
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        * @param aPayload Buffer to be filled with SID data
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        * @param aRequestSize Amount of data to be generated to buffer.
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        * @return void
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        */
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        void GenerateSidPacket( TDes8& aPayload, TInt aRequestSize );
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        /**
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        * Jitterbuffer has noted that frames were missing, so error concealment
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        * needs to be done to some frames. This function calls the error 
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        * concealment interface's error concealment function.
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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 ConcealErrorForNextFrame() const;
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        /**
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        * Returns the current DTX status
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        * @since Series 60 3.0
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        * @param None
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        * @return TBool ETrue if DTX period ongoing
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        */
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        inline TBool DtxPeriodStatus() const
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            {
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            return ( iDtxPeriodStarted );
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            }
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        /**
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        * Decide whether we are in DTX period or in normal speech period
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        * @since Series 60 3.0
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        * @param aData Buffer containing the data
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        * @return void
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        */
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        void DoDtxDecision( const TDesC8& aData );
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        /**
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        * Check if the given databuffer is a SID frame for current codec
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        * @since Series 60 3.0
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        * @param aData Buffer containing the data
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        * @return TBool ETrue if the aBuffer is a SID for current codec
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        */
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        TBool IsSidBuffer( const TDesC8& aData ) const;
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    private: // New functions
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        /**
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        * Generates an AMR CN packet into aPayload
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        * @since Series 60 3.0
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        * @param aPayload
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        * @return void
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        */
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        void GenerateAmrNoDataPacket( TDes8& aPayload ) const;
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        /**
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        * Generates an VoIP NO_DATA frame into aPayload
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        * @since Series 60 3.0
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        * @param aPayload Buffer to be filled with VoIP NO_DATA information
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        * @param aRequestSize Amount of data to be generated to buffer.
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        * @return void
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        */
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        void GenerateVoIPNoDataPacket( TDes8& aPayload, TInt aRequestSize ) const;
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    private: //Constructors
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        /**
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        * C++ default constructor.
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        */
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        CMccCnGenerator( const TFourCC& aAudioType, CMMFDevSound& aDevSound );
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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:    // Data
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        // Audio type
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        TFourCC iAudioType;
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        // Sound device for Error Concealment IF creation
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        CMMFDevSound& iDevSound;
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        // Error concealment interface
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        CErrorConcealmentIntfc* iErrorConcealer;
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        // Generated CN frames
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        TInt iGeneratedCnFrames;
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        // DTX period started
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        TBool iDtxPeriodStarted;
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    private:    // Friend classes
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    // Friend class for EUNIT tests
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    #ifdef TEST_EUNIT
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        friend class UT_CMccCnGenerator;
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    #endif
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    };
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#endif  // MCCCNGENERATOR_H