/*

* Copyright (c) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Implementation of Dynamic Configuration

*

*/

#include "camvideotime.h"

const TReal   KMetaDataCoeff         = 1.03;      // Coefficient to estimate metadata amount

const TUint   KCamCMaxClipDurationInSecs = 5400;  // Maximun video clip duration in seconds

const TReal   KCMRAvgVideoBitRateScaler = 0.9;

const TUint   KDiskSafetyLimit       = 400000;    // Amount of free disk space to leave unused

// -----------------------------------------------------------------------------

// TCamVideoTime::TCamVideoTime

//

// Constructor

// -----------------------------------------------------------------------------

//

TCamVideoTime::TCamVideoTime( TInt64 aDiskSpace,

                              TInt64 aCriticalLimit,             

                              TInt   aVideoBitRate,

                              TInt   aAudioBitRate,

                              TInt64 aSizeLimit,

                              TBool  aMuteAudio,

                              TReal  aBitrateScaler )

    {

    // Video bitrate scaler - if not given, use default

    TReal scaler = KCMRAvgVideoBitRateScaler;

    if( aBitrateScaler != 0 )

      {

      scaler = aBitrateScaler;

      }

    // Init bitrates    

    iVideoAverageBitRate = static_cast<TInt>( aVideoBitRate * scaler );

    iAudioAverageBitRate = aAudioBitRate;  

    if( aMuteAudio )

      {  

      iAudioAverageBitRate = 0;

      }      

    // Calculate available disk space, taking into account safety limit

    // and disk critical level limit

    iAvailableSpaceAtStart = aDiskSpace - KDiskSafetyLimit - aCriticalLimit;

    if( iAvailableSpaceAtStart <= 0 )

      {

      iAvailableSpaceAtStart = 0;

      }

    // File size limit

    iSizeLimit = aSizeLimit;           

    }               

// -----------------------------------------------------------------------------

// TCamVideoTime::GetRemainingTimeL - from CamC3GPDataSinkImp.cpp 

//

// Return the estimated remaining time for the recording in microseconds.

// This method takes into account the file size and disk full restrictions.

// -----------------------------------------------------------------------------

//

TTimeIntervalMicroSeconds TCamVideoTime::GetRemainingTimeL()

    {

    TTimeIntervalMicroSeconds  remaining;

    TInt64 availableSpace;

    TBool remainingFromSizeLimit = EFalse;                   

    if (iSizeLimit && ( (TInt64)iSizeLimit < iAvailableSpaceAtStart ) )

        {

        // use sizelimit as available space.

        remainingFromSizeLimit = ETrue;

        }

    // Use average audio/video bitrates to estimate remaining time

    TUint  averageBitRate;

    TUint  averageByteRate;

    averageBitRate = (TUint)((iVideoAverageBitRate + iAudioAverageBitRate) * KMetaDataCoeff);

    averageByteRate = averageBitRate / 8;

    if (remainingFromSizeLimit)

        {

        availableSpace = iSizeLimit;

        }

    else

        {

        availableSpace = iAvailableSpaceAtStart;

        }

    if (availableSpace <= 0)

        {

        remaining = 0;

        }

    else

        {

        remaining = availableSpace * 1000000 / averageByteRate; // 1000000 is for conversion between microseconds and seconds

        if ( (remaining.Int64()) > (TInt64(KCamCMaxClipDurationInSecs)*1000000) )

            {

            remaining = (TInt64(KCamCMaxClipDurationInSecs)*1000000);

            }

        }

    if ( remaining <= TInt64(0) )

        {

        remaining = 0;

        }

    return remaining;

    }

// End of file