Re: Timing problem on PPC based Macs (PortAudio)
Re: Timing problem on PPC based Macs (PortAudio)
- Subject: Re: Timing problem on PPC based Macs (PortAudio)
- From: Thomas Tempelmann <email@hidden>
- Date: Fri, 20 Mar 2009 23:35:17 +0100
On Fri, Mar 20, 2009 at 22:55, james mccartney <email@hidden> wrote:
> Is that "normal"? Can it be adjusted somehow?
>
> Yes it it quite normal. It means that two different clocks are within
> 0.00833 % of each other. That's actually pretty amazing.
Where do you see two different clocks there? It's all happening on one
Machine, and all clocks refer to one central OS clock, AFAIK.
I just find it odd that the two tested PPC Macs show this some loss of
a few frames per second, while the two tested Intels don't do that.
Or wait - could it be that the audio playing is performed by an
independent circuit which has its own clock, and the OS driver is
simply feeding it the samples? Hmm. Of course, that's probably what
you were talking about. The times where the CPU would feed each sample
itsself to an DA converter are long gone...
But that would mean that they use their own clock providers on the PPC
boards, while the ones on the Intel boards might be sharing the same
clock source (i.e. same quartz)?
--
Thomas Tempelmann, http://www.tempel.org/
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