camerauis/cameraapp/generic/src/camvideotime.cpp
branchRCL_3
changeset 54 bac7acad7cb3
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53:61bc0f252b2b 54:bac7acad7cb3
       
     1 /*
       
     2 * Copyright (c) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). 
       
     3 * All rights reserved.
       
     4 * This component and the accompanying materials are made available
       
     5 * under the terms of "Eclipse Public License v1.0"
       
     6 * which accompanies this distribution, and is available
       
     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
       
     8 *
       
     9 * Initial Contributors:
       
    10 * Nokia Corporation - initial contribution.
       
    11 *
       
    12 * Contributors:
       
    13 *
       
    14 * Description:  Implementation of Dynamic Configuration
       
    15 *
       
    16 */
       
    17 
       
    18 
       
    19 #include "camvideotime.h"
       
    20 
       
    21 const TReal   KMetaDataCoeff         = 1.03;      // Coefficient to estimate metadata amount
       
    22 const TUint   KCamCMaxClipDurationInSecs = 5400;  // Maximun video clip duration in seconds
       
    23 const TReal   KCMRAvgVideoBitRateScaler = 0.9;
       
    24 const TUint   KDiskSafetyLimit       = 400000;    // Amount of free disk space to leave unused
       
    25 
       
    26 // -----------------------------------------------------------------------------
       
    27 // TCamVideoTime::TCamVideoTime
       
    28 //
       
    29 // Constructor
       
    30 // -----------------------------------------------------------------------------
       
    31 //
       
    32 TCamVideoTime::TCamVideoTime( TInt64 aDiskSpace,
       
    33                               TInt64 aCriticalLimit,             
       
    34                               TInt   aVideoBitRate,
       
    35                               TInt   aAudioBitRate,
       
    36                               TInt64 aSizeLimit,
       
    37                               TBool  aMuteAudio,
       
    38                               TReal  aBitrateScaler )
       
    39     {
       
    40 
       
    41     // Video bitrate scaler - if not given, use default
       
    42     TReal scaler = KCMRAvgVideoBitRateScaler;
       
    43     if( aBitrateScaler != 0 )
       
    44       {
       
    45       scaler = aBitrateScaler;
       
    46       }
       
    47      
       
    48     // Init bitrates    
       
    49     iVideoAverageBitRate = static_cast<TInt>( aVideoBitRate * scaler );
       
    50     iAudioAverageBitRate = aAudioBitRate;  
       
    51           
       
    52     if( aMuteAudio )
       
    53       {  
       
    54       iAudioAverageBitRate = 0;
       
    55       }      
       
    56         
       
    57     // Calculate available disk space, taking into account safety limit
       
    58     // and disk critical level limit
       
    59     iAvailableSpaceAtStart = aDiskSpace - KDiskSafetyLimit - aCriticalLimit;
       
    60     if( iAvailableSpaceAtStart <= 0 )
       
    61       {
       
    62       iAvailableSpaceAtStart = 0;
       
    63       }
       
    64     
       
    65     // File size limit
       
    66     iSizeLimit = aSizeLimit;           
       
    67     }               
       
    68 
       
    69 
       
    70 
       
    71 // -----------------------------------------------------------------------------
       
    72 // TCamVideoTime::GetRemainingTimeL - from CamC3GPDataSinkImp.cpp 
       
    73 //
       
    74 // Return the estimated remaining time for the recording in microseconds.
       
    75 // This method takes into account the file size and disk full restrictions.
       
    76 // -----------------------------------------------------------------------------
       
    77 //
       
    78 TTimeIntervalMicroSeconds TCamVideoTime::GetRemainingTimeL()
       
    79     {
       
    80     TTimeIntervalMicroSeconds  remaining;
       
    81     TInt64 availableSpace;
       
    82     TBool remainingFromSizeLimit = EFalse;                   
       
    83 
       
    84     if (iSizeLimit && ( (TInt64)iSizeLimit < iAvailableSpaceAtStart ) )
       
    85         {
       
    86         // use sizelimit as available space.
       
    87         remainingFromSizeLimit = ETrue;
       
    88         }
       
    89 
       
    90     // Use average audio/video bitrates to estimate remaining time
       
    91     TUint  averageBitRate;
       
    92     TUint  averageByteRate;
       
    93 
       
    94     averageBitRate = (TUint)((iVideoAverageBitRate + iAudioAverageBitRate) * KMetaDataCoeff);
       
    95     averageByteRate = averageBitRate / 8;
       
    96 
       
    97     if (remainingFromSizeLimit)
       
    98         {
       
    99         availableSpace = iSizeLimit;
       
   100         }
       
   101     else
       
   102         {
       
   103         availableSpace = iAvailableSpaceAtStart;
       
   104         }
       
   105 
       
   106     if (availableSpace <= 0)
       
   107         {
       
   108         remaining = 0;
       
   109         }
       
   110     else
       
   111         {
       
   112         remaining = availableSpace * 1000000 / averageByteRate; // 1000000 is for conversion between microseconds and seconds
       
   113 
       
   114         if ( (remaining.Int64()) > (TInt64(KCamCMaxClipDurationInSecs)*1000000) )
       
   115             {
       
   116             remaining = (TInt64(KCamCMaxClipDurationInSecs)*1000000);
       
   117             }
       
   118         }
       
   119 
       
   120     if ( remaining <= TInt64(0) )
       
   121         {
       
   122         remaining = 0;
       
   123         }
       
   124     return remaining;
       
   125     }
       
   126 
       
   127 // End of file