harvester/harvesterplugins/RTPPlugin/src/harvesterrtpmetadatareader.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:34:07 +0200
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permissions -rw-r--r--
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/*
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* Copyright (c) 2007-2009 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:  Reads metadata from rtp clip meta header
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*
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*/
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#include "harvesterrtpmetadatareader.h"
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#include "harvesterrtpplugin.h"
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#include "harvesterlog.h"
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_LIT( KTxtSpace, " ");
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// ======== MEMBER FUNCTIONS ========
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// ---------------------------------------------------------------------------
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// Constructor
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// ---------------------------------------------------------------------------
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//
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CHarvesterRtpMetaDataReader* CHarvesterRtpMetaDataReader::NewL( 
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    const TDesC8* aFileBuffer  )
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    {
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    CHarvesterRtpMetaDataReader* self =
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        new( ELeave ) CHarvesterRtpMetaDataReader( aFileBuffer );
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    CleanupStack::PushL( self );
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    self->ConstructL();
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    CleanupStack::Pop( self );
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    return self;
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    }
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// ---------------------------------------------------------------------------
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// Destructor
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// ---------------------------------------------------------------------------
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//
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CHarvesterRtpMetaDataReader::~CHarvesterRtpMetaDataReader()
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    {
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    WRITELOG( "CHarvesterRtpMetaDataReader::~CHarvesterRtpMetaDataReader()" );
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    delete iMetaData;
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    }
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// ---------------------------------------------------------------------------
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// Read details from meta header
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// ---------------------------------------------------------------------------
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//
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void CHarvesterRtpMetaDataReader::GetClipDetailsL( 
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    CHarvesterRtpClipDetails& aDetails )
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    {
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    WRITELOG( "CHarvesterRtpMetaDataReader::GetClipDetailsL()" );
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    // Attributes
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    TPtrC8 bytes( iDataPtr.Mid( KAttributesPoint, KIntegerBytes ) );
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    TUint data( 0 );
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    User::LeaveIfError( GetValue( bytes, data ) );
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    // Recording quality 
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    aDetails.iQuality = 
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        ( TUint8 )( ( data >> KQualityFieldShift ) & KMaxTUint8 );
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    //Recording ongoing 
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    aDetails.iRecOngoing = 
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        ( data >> KOngoingFlagShift ) & ETrue;
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    // Recording completed 
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    aDetails.iRecCompleted = 
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        ( data >> KCompletedFlagShift ) & ETrue;
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    //Recording failed 
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    aDetails.iRecFailed = 
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        ( data >> KFailedFlagShift ) & ETrue;
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    //Parental rate
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    aDetails.iParental =
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         ( TUint8 )( ( data >> KParentalFieldShift ) & KMaxTUint8 );
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    // Post rule    
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    TUint8 postRule = 
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        ( TUint8 )( ( data >> KPostRuleFieldShift ) & KMaxTUint8 );
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    if ( postRule == KContentRightsLockToDevice )
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        {
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        aDetails.iPostRule = ETrue;
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        }
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    else
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        {
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        aDetails.iPostRule = EFalse;
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        }
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    // Duration
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    TUint duration( 0 ); 
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    TPtrC8 durationBytes ( iDataPtr.Mid( KDurationPoint, KIntegerBytes ) );
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    User::LeaveIfError( GetValue( durationBytes, duration ) );
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    duration /= 1000; //Convert to seconds 
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    aDetails.iDuration = static_cast<TReal32>( duration );
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    // Title
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    GetProgramTitleL( aDetails.iTitle );
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    }
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// ---------------------------------------------------------------------------
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// Default constructor
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// ---------------------------------------------------------------------------
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//
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CHarvesterRtpMetaDataReader::CHarvesterRtpMetaDataReader(
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    const TDesC8* aFileBuffer )
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    : iMetaTotal( KErrNotFound ),
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      iMetaData( NULL ),
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      iDataPtr( 0, 0 ),
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      iEsgDataPoint ( KErrNotFound ),
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      iFileBuffer( aFileBuffer )
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    {
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    // None
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    }
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   118
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// ---------------------------------------------------------------------------
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// 2nd phase constructor
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// ---------------------------------------------------------------------------
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//
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void CHarvesterRtpMetaDataReader::ConstructL()
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    {
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    WRITELOG( "CHarvesterRtpMetaDataReader::ConstructL()" );
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    TPtrC8 bytes;
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    if ( iFileBuffer 
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        && iFileBuffer->Length() > KIntegerBytes )
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        {
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        // Read whole meta area
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        bytes.Set( iFileBuffer->Mid( KMetaLengthPoint, KIntegerBytes ) );
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        }        
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   134
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    TUint value ( 0 );
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    User::LeaveIfError( GetValue( bytes, value ) );
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    iMetaTotal = value;
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    if ( iMetaTotal > KMaxMetaHeaderLength || iMetaTotal <= 0 )
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        {
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        //Length not reasonable, metadata corrupted
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        WRITELOG( "CHarvesterRtpMetaDataReader - metadata corrupted, leave!" );
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        User::Leave( KErrCorrupt );
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        }
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   146
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    iMetaData = HBufC8::NewL( iMetaTotal );
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    *iMetaData = iFileBuffer->Mid( KMetaLengthPoint, iMetaTotal );
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   149
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    iDataPtr.Set( iMetaData->Des() );
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   151
            
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    // Check that all data exist in meta header
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    if ( iDataPtr.Length() < iMetaTotal )
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        {
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        //Meta header corrupted
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        WRITELOG( "CHarvesterRtpMetaDataReader - metaheader corrupted, leave!" );
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        User::Leave( KErrCorrupt );
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        }
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   159
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    // ESG data point ( device info point + device info data )
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    iEsgDataPoint = KDeviceInfoPoint + KStringLengthBytes +
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                    iDataPtr[KDeviceInfoPoint];
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   163
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    }
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// -----------------------------------------------------------------------------
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// Reads data with length info of meta header from the clip
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// -----------------------------------------------------------------------------
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//
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void CHarvesterRtpMetaDataReader::ReadStringDataL( 
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    const TInt aPosition, 
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    TPtrC8& aData )
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    {
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    WRITELOG( "CHarvesterRtpMetaDataReader::ReadStringDataL()" );
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   175
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    if ( aPosition < 0 
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        || aPosition > iDataPtr.Length() )
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        {
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        WRITELOG( "CHarvesterRtpMetaDataReader - KErrArgument, leave!" );
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        User::Leave( KErrArgument );
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        }
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   182
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    const TInt len( iDataPtr[aPosition] );
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   185
    if ( len < 0 
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        || len > TInt( KMaxTUint8 ) )
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   187
        {
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   188
        WRITELOG( "CHarvesterRtpMetaDataReader - KErrCorrupt, leave!" );
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   189
        User::Leave( KErrCorrupt );
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   190
        }
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   191
        
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    aData.Set( iDataPtr.Mid( aPosition + KStringLengthBytes, len ) );
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   193
    }
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   194
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// -----------------------------------------------------------------------------
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// Get value
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// -----------------------------------------------------------------------------
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   198
//
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   199
TInt CHarvesterRtpMetaDataReader::GetValue( 
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    const TDesC8& aBytes, 
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   201
    TUint& aValue )
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   202
    {
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   203
    WRITELOG( "CHarvesterRtpMetaDataReader::GetValue()" );
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   204
    if ( aBytes.Length() >= KIntegerBytes )
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   205
        {
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   206
        aValue = ( TUint )( aBytes[0] );
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   207
        aValue <<= 8;
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   208
        aValue |= ( TUint )( aBytes[1] );
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   209
        aValue <<= 8;
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   210
        aValue |= ( TUint )( aBytes[2] );
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   211
        aValue <<= 8;
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   212
        aValue |= ( TUint )( aBytes[3] );
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   213
        return KErrNone;
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   214
        }
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   215
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    WRITELOG( "CHarvesterRtpMetaDataReader::GetValue() : KErrUnderFlow!" );
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   217
    return KErrUnderflow;
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   218
    }
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   219
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   220
// -----------------------------------------------------------------------------
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   221
// Get and format clip title
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   222
// -----------------------------------------------------------------------------
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   223
//
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   224
void CHarvesterRtpMetaDataReader::GetProgramTitleL( TDes& aTitle )
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   225
    {
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   226
    WRITELOG( "CHarvesterRtpMetaDataReader::GetProgramTitleL()" );
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   227
    
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   228
    User::LeaveIfError( iEsgDataPoint );
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   229
    aTitle.Zero();
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   230
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    TUint32 totalLength( 0 );
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    TPtrC8 service;
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    TPtrC8 program;
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    ReadStringDataL( iEsgDataPoint, service );
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    totalLength += service.Length();
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    totalLength += KSpaceLength;
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    // Program name
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    const TInt progPos( iEsgDataPoint + KStringLengthBytes + service.Length() );
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    ReadStringDataL( progPos, program );
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    totalLength += program.Length();
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    HBufC8* title = HBufC8::NewLC( totalLength );
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    title->Des().Append( service.Ptr(), service.Length() );
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    title->Des().Append( KTxtSpace );
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    title->Des().Append( program.Ptr(), program.Length() ); 
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    if ( totalLength > KMaxProgramTitle ) 
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        {
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        //Make title fit in max title length
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        TPtrC8 titlePtr( *title );
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        aTitle.Copy( titlePtr.Mid( 0 , KMaxProgramTitle ) );
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        }
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    else
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        {
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        aTitle.Copy( *title );
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        }
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    CleanupStack::PopAndDestroy( title );
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    }
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