Re: IOAudioDevice Startup Latency
Re: IOAudioDevice Startup Latency
- Subject: Re: IOAudioDevice Startup Latency
- From: Jeff Moore <email@hidden>
- Date: Wed, 11 Dec 2002 11:24:00 -0800
So if I'm understanding what you are saying correctly, you have
observed a latency between when the data is bussed to your card (by DMA
or some other way?) and when your card's DAC's put the signal on the
line. If that's right, that sounds like a hardware issue with how your
card interfaces with the PCI bus. This is probably not the best forum
for your question in that case, but perhaps I'm misunderstanding?
On Wednesday, December 11, 2002, at 07:11 AM, Dirk Musfeldt wrote:
Hi all,
I have a PCI device that has audio and video output over PCI as well
as a
line out port.
I observe an offset between the audio over PCI and the audio over the
line
out port. I have difficulties to measure the exact amount of the
offset but
I think it is about 500 msec.
Of course there has to be an offset but I think it should be less than
500
msec.
How could I minimize the offset?
With kind regards
Dirk Musfeldt
Meilenstein Mac OS Software
Neue Strasse 5
D-31582 Nienburg
Germany
Tel: +49 (0) 5021 91 24 44
Fax: +49 (0) 5021 91 24 45
<http://www.meilenstein.de/>
--
Jeff Moore
Core Audio
Apple
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