[SDL] SDL_CDStatus: kills win32 performance

Damien Mascré damienmascre at free.fr
Thu Aug 9 15:32:01 PDT 2001


Le 09 Aug 2001 14:46:50 -0700, Joseph Carter a écrit :

> On Thu, Aug 09, 2001 at 01:48:58PM -0700, Sam Lantinga wrote:
> > > According to our win32 guys, frequent calls to SDL_CDStatus cause
choppy
> > > video, sound, etc and are a general detriment to performance.  I
don't
> > > have a problem with it in Linux, and I don't know about mac or
anything
> > > else since we haven't got someone working on those platforms yet.
In any
> > > event, I don't think we should be seeing this problem.  Bug maybe?
> > 
> > This is just the way Windows works.  Only call CDAudio_Update()
every
> > few seconds or so.
> 
> Hmm, we had some win32-native code that was a bit better behaved than
> that, but elected not to use it in favor of SDL.  I guess I'll have to
> compare what it does with what SDL does internally.  Will report back
any
> interesting findings.

SDL_CDStatus does a lot of extra stuff uneeded... you can hack a smaller
version of SDL_CDStatus that do not query the cdaudio toc everytime...

I have written a cd audio player in the past using pure win32 calls...
and I remember
that querying the toc was sometimes nasty...

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