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List:       helix-common-dev
Subject:    Re: [Common-dev] CR: Change system time has impact on Helix playback
From:       Greg Wright <gwright () real ! com>
Date:       2008-03-26 22:03:23
Message-ID: 47EAC82B.3030604 () real ! com
[Download RAW message or body]

Also it would be a good idea to run a performance check after
the switch. GetTickCount is called *A LOT* and very small
changes in the performance of that function can result in
large changes in user perceived performance. Just in case....

--greg.


Gang.Jia@nokia.com wrote:
> "Nokia submits this code under the terms of a commercial contribution 
> agreement with RealNetworks,
> and I am authorized to contribute this code under said agreement."
> 
> Modified by:  Gang.Jia@nokia.com
> 
> Reviewed by:
> 
> Date: 3/25/2007
> 
> Project: SymbianMmf_rel
> 
> ErrorId:  ECZU-7AJDAB
> 
> Synopsis: CR: Change system time has impact on Helix playback on Symbian
> 
> Overview: On Symbian platform the GetTickCount() uses gettimeofday() to 
> get the tick count. That
> introduces the impact of the system clock and system clock time can be 
> changed in cases like
> daylight saving time change. The solution is to use a real tick counter 
> in Symbian -
> User::NTickCount(). Normally it will give 1ms time resolution on 
> hardware and 5ms on the emulator.
> 
> 
> Root Cause of the problem:  Implementation.
> 
> Files Added:   None.
> 
> Files Modified:
> /build/umakecf/symbian.cf
> /client/common/system/hxsched.cpp
> /common/system/platform/symbian/gettickcount.c
> 
> Image Size and Heap Use impact: no major impact
> 
> Module Release testing (STIF) :  Passed.
> 
> Test case(s) Added  :  N/A.
> 
> Memory leak check performed : Yes. No new leaks introduced
> 
> Platforms and Profiles Build Verified: helix-client-s60-50-mmf-mdf-arm
> 
> Platforms and Profiles Functionality verified: armv5 & winscw
> 
> Branch: 210CayS & Head
> 
> <<diff.txt>>
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Common-dev mailing list
> Common-dev@helixcommunity.org
> http://lists.helixcommunity.org/mailman/listinfo/common-dev


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