videoutils_plat/dvrengine_api/inc/ipvideo/CRtpFileBase.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:14:38 +0200
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/*
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* Copyright (c) 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 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:    Base methods/variables for RTP file format recording.*
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*/
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#ifndef CRTPFILEBASE_H
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#define CRTPFILEBASE_H
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// INCLUDES
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#include <ipvideo/CRtpUtil.h>
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#include <f32file.h>
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// CONSTANTS
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const TInt KCurrentClipVersion( 3 );
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const TInt KMinValidClipVersion( 2 );
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const TInt KSeekHeaderBytes( 3 * KIntegerBytes );
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const TInt KGroupHeaderBytes( 4 * KIntegerBytes );
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const TInt KPacketsCountBytes( 4 );
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const TInt KNormalRecGroupLength( 2000 ); // 2 s
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const TUint KSeekArrayInterval( 30000 );  // 30 s
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// MACROS
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// None
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// DATA TYPES
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// None
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// FORWARD DECLARATIONS
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// None
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// CLASS DECLARATION
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/**
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*  RTP format common functionalities.
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*
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*  @lib RtpClipHandler.lib
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*  @since Series 60 3.0
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*/
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class CRtpFileBase : public CActive
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    {
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public: // Data types
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    // Time shift seek array
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    class STimeShiftSeek 
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        {
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    public: // Data
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        /**
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        * Group time.
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        */
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        TUint iGroupTime;
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        /**
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        * File seek point.
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        */
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        TInt iSeekpoint;
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        /**
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        * File name index.
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        */
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        TInt iNameIndex;
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        };
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public: // Constructors and destructor
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    /**
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    * Destructor.
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    */
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    virtual ~CRtpFileBase();
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protected: // Constructors and destructor
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    /**
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    * C++ default constructor.
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    */
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    CRtpFileBase();
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    /**
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    * Symbian 2nd phase constructor can leave and is private by default.
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    */
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    void ConstructL();
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protected: // Enumeration
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    // Defines RTP file mode
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    enum TRtpFileMode
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        {
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        EModeNone = KErrBadHandle,
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        EModeNormal = KErrNone,
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        EModeHandle,
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        EModeTimeShift
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        };
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public: // New functions
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    /**
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    * Deletes time shift files.
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    * @since Series 60 3.0
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    * @param aShiftSeek a reference to time shift seek array.
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    * @return None.
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    */
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    void DeleteTimeShiftFiles( RArray<STimeShiftSeek>& aShiftSeek );
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protected: // New functions
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    /**
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    * Writes RTP seek header to a file.
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    * @since Series 60 3.0
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    * @return None.
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    */
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    void WriteSeekHeaderL();
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    /**
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    * Reads clip's seek header from a file.
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    * @since Series 60 3.0
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    * @return None.
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    */
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    void ReadSeekHeaderL();
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    /**
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    * Reads clip's group header from a file.
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    * @since Series 60 3.0
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    * @return None.
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    */
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    void ReadGroupHeaderL();
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    /**
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    * Updates group header variables from readed data.
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    * @since Series 60 3.0
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    * @param aDataPtr data from which header is updated.
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    * @return None.
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    */
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    void UpdateGroupHeaderVariablesL( const TDesC8& aDataPtr );
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    /**
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    * Appends one group to the seek array.
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    * @since Series 60 3.0
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    * @param aTime a TS time of first packet in group.
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    * @param aPoint a seek point in clip for group.
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    * @return None.
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    */
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    void AppendSeekArrayL( const TUint aTime,
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                           const TInt aPoint );
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    /**
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    * Saves seek array to the clip.
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    * @since Series 60 3.0
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    * @return None.
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    */
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    void SaveSeekArrayL();
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    /**
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    * Reads seek array from the clip.
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    * @since Series 60 3.0
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    * @param aPoint a seek array point in clip.
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    * @return true if items in seek array, otherwise false.
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    */
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    TBool ReadSeekArrayL( const TInt aPoint );
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    /**
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    * Resets seek array.
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    * @since Series 60 3.0
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    * @return None.
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    */
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    inline void ResetSeekArray();
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    /**
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    * Writes variables to log file.
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    * @since Series 60 3.0
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    * @param aMethod a method which called this
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    */
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    void LogVariables( const TDesC& aMethod );
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private: // Functions from base classes
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    /**
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    * From CActive : Called when request completion event occurs.
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    * @since Series 60 3.0
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    * @return None.
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    */
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    virtual void RunL() = 0;
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    /**
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    * From CActive : Handles a leave occurring in the request
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    *                completion event handler RunL().
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    * @since Series 60 3.0
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    * @param aError the leave code
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    * @return status of run error handling
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    */
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    virtual TInt RunError( TInt aError ) = 0;
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    /**
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    * From CActive : Called when request completion event cancelled.
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    * @since Series 60 3.0
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    * @return None.
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    */
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    virtual void DoCancel() = 0;
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protected: // Data types
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    // Defines seek struct
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    class SSeek
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        {
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    public: // Data
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        /**
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        * Enlapsed time.
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        */
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        TUint iTime;
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        /**
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        * Point in clip.
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        */
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        TInt iPoint;
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        };
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protected: // Data
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    /**
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    * Rtp file usage mode.
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    */
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    TRtpFileMode iMode;
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    /**
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    * Current group.
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    */
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    TInt iThisGroup;
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    /**
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    * Packet group counter (Seek header).
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    */
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    TInt iGroupsTotalCount;
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    /**
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    * First seek address (Seek header).
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    */
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    TInt iFirstSeekAddr;
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    /**
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    * Last seek address (Seek header).
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    */
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    TInt iLastSeekAddr;
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    /**
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    * Group total length (Group header).
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    */
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    TInt iGroupTotalLen;
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    /**
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    * Next group point (Group header).
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    */
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    TInt iNextGroupPoint;
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    /**
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    * Previous group point (Group header).
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    */
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    TInt iPrevGroupPoint;
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    /**
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    * Group time (Group header).
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    */
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    TUint iGroupTime;
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    /**
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    * Seek header point.
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    */
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    TInt iSeekHeaderPoint;
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    /**
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    * Current clip path.
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    */
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    HBufC* iCurrentPath;
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    /**
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    * Seek array.
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    */
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    CArrayFix<SSeek>* iSeekArray;
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    /**
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    * File data buffer pointer.
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    */
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    TPtr8 iDataPtr;
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    /**
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    * File server.
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    */
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    RFs iFs;
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    /*
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    * File operations.
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    */
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    RFile iFile;
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  };
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#include <ipvideo/CRtpFileBase.inl>
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#endif // CRTPFILEBASE_H
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// End of File