Re: CPU Usage difference
Re: CPU Usage difference
- Subject: Re: CPU Usage difference
- From: tahome izwah <email@hidden>
- Date: Fri, 6 Mar 2009 11:31:08 +0100
That's totally possible, however, it might also just be a sign of
different buffer sizes and -formats for the two devices, depending on
the hardware and drivers that they use. IOW, there might be some more
bit shuffling going on under the hood that would account for the
difference you see.
--th
2009/3/6 Alex ROUGE <email@hidden>:
> Hi everybody.
> Recently, while testing an home made application that requiere CoreAudio I
> found something interesting.
> I'm working with a Macbook (Alu) with 4GB memory, 2.4Ghz.....
>
> What I found is that, all application who requiere audio output doesn't have
> the same CPU usage depending if the audio output is internal speaker or
> headphone/line out.
> The difference is impressive.
> For instance, if we use the Finder to play an audio file :
>
> Line out : CPU charge = 3.5%
> Internal speaker : CPU charge = 10.9%
>
> I think Apple ® is doing a software filtering to compensate very small sized
> speaker but this difference is really huge.
>
> Can Apple ® provide more information about this behavior ?
>
> Regards
>
> Alex _______________________________________________
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