Lists

Terms and Conditions
Lists hosted on this site
Email the Postmaster
Tips for posting to public mailing lists

CPU Usage difference

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

CPU Usage difference

Subject: CPU Usage difference
From: Alex ROUGE <email@hidden>
Date: Fri, 6 Mar 2009 11:25:46 +0100

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 _______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


Follow-Ups:

Re: CPU Usage difference
From: William Stewart <email@hidden>
Re: CPU Usage difference
From: tahome izwah <email@hidden>


Prev by Date:
Re: Pitch-Shift on the iPhone

Next by Date:
Re: CPU Usage difference

Previous by thread:
RE: Headset in iPod Touch still works even if audio route is Speaker

Next by thread:
Re: CPU Usage difference

Index(es):

Date
Thread