camerauis/cameraapp/generic/src/camvideotime.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 27 Apr 2010 16:19:06 +0300
branchRCL_3
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parent 0 1ddebce53859
permissions -rw-r--r--
Revision: 201015 Kit: 201017
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/*
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* Copyright (c) 2008-2010 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:  Implementation of Dynamic Configuration
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*
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*/
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#include "camvideotime.h"
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const TReal   KMetaDataCoeff         = 1.03;      // Coefficient to estimate metadata amount
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const TUint   KCamCMaxClipDurationInSecs = 5400;  // Maximun video clip duration in seconds
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const TReal   KCMRAvgVideoBitRateScaler = 0.9;
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const TUint   KDiskSafetyLimit       = 400000;    // Amount of free disk space to leave unused
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// -----------------------------------------------------------------------------
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// TCamVideoTime::TCamVideoTime
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//
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// Constructor
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// -----------------------------------------------------------------------------
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//
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TCamVideoTime::TCamVideoTime( TInt64 aDiskSpace,
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                              TInt64 aCriticalLimit,             
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                              TInt   aVideoBitRate,
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                              TInt   aAudioBitRate,
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                              TInt64 aSizeLimit,
0
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                              TBool  aMuteAudio,
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                              TReal  aBitrateScaler )
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    {
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    // Video bitrate scaler - if not given, use default
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    TReal scaler = KCMRAvgVideoBitRateScaler;
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    if( aBitrateScaler != 0 )
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      {
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      scaler = aBitrateScaler;
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      }
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    // Init bitrates    
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    iVideoAverageBitRate = static_cast<TInt>( aVideoBitRate * scaler );
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    iAudioAverageBitRate = aAudioBitRate;  
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    if( aMuteAudio )
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      {  
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      iAudioAverageBitRate = 0;
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      }      
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    // Calculate available disk space, taking into account safety limit
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    // and disk critical level limit
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    iAvailableSpaceAtStart = aDiskSpace - KDiskSafetyLimit - aCriticalLimit;
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    if( iAvailableSpaceAtStart <= 0 )
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      {
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      iAvailableSpaceAtStart = 0;
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      }
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    // File size limit
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    iSizeLimit = aSizeLimit;           
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    }               
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// -----------------------------------------------------------------------------
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// TCamVideoTime::GetRemainingTimeL - from CamC3GPDataSinkImp.cpp 
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//
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// Return the estimated remaining time for the recording in microseconds.
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// This method takes into account the file size and disk full restrictions.
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// -----------------------------------------------------------------------------
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//
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TTimeIntervalMicroSeconds TCamVideoTime::GetRemainingTimeL()
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    {
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    TTimeIntervalMicroSeconds  remaining;
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    TInt64 availableSpace;
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    TBool remainingFromSizeLimit = EFalse;                   
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    if (iSizeLimit && ( (TInt64)iSizeLimit < iAvailableSpaceAtStart ) )
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        {
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        // use sizelimit as available space.
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        remainingFromSizeLimit = ETrue;
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        }
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    // Use average audio/video bitrates to estimate remaining time
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    TUint  averageBitRate;
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    TUint  averageByteRate;
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    averageBitRate = (TUint)((iVideoAverageBitRate + iAudioAverageBitRate) * KMetaDataCoeff);
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    averageByteRate = averageBitRate / 8;
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    if (remainingFromSizeLimit)
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        {
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        availableSpace = iSizeLimit;
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        }
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    else
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        {
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        availableSpace = iAvailableSpaceAtStart;
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        }
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    if (availableSpace <= 0)
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        {
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        remaining = 0;
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        }
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    else
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        {
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        remaining = availableSpace * 1000000 / averageByteRate; // 1000000 is for conversion between microseconds and seconds
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        if ( (remaining.Int64()) > (TInt64(KCamCMaxClipDurationInSecs)*1000000) )
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            {
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            remaining = (TInt64(KCamCMaxClipDurationInSecs)*1000000);
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            }
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        }
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   119
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    if ( remaining <= TInt64(0) )
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        {
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        remaining = 0;
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        }
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    return remaining;
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    }
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parents:
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   126
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parents:
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   127
// End of file