Re: I/O Latency (Was: Layman with a mission)
Re: I/O Latency (Was: Layman with a mission)
- Subject: Re: I/O Latency (Was: Layman with a mission)
- From: Dennis Gunn <email@hidden>
- Date: Thu, 14 Oct 2004 14:35:45 +0900
On Oct 14, 2004, at 2:17 AM, William Stewart wrote:
I think there's one point that needs to be clarified. The I/O
mechanism used
by CoreAudio is not buffered in the way that Dennis is asserting.
I am sorry if I appear to be asserting anything about what specifically
is going in the path between the application and the IO. All I know is
that traveling that part of the signal path is taking time, and I
thought I was being clear that what I wanted to find out was if there
was something core audio is doing that could be turned off in order to
get rid of that delay.
How it works is this.....
Thank you, I am still digesting that but I appreciate the explanation.
This safety offset is often abused by driver writers. I think the real
question is this - why are some of the "professional quality" audio
devices
and their drivers performing so badly? Have you asked the companies
that
produce these products about these problems?
Personally I asked RME and the tech's exact words were
Apple has been requested from
several sides to widen CoreAudio and add a
direct access method like
ASIO. Let's wait what will happen.
So if RME are waiting for Apple and Apple are waiting for RME....
We continue to have an open
invitation to *any* driver developer to help work on their
code/interface
and I am sure that unhappy customers will exert a great influence to
have
these companies fix their problems.
I think that momentum will pick up.
But frankly I could be wrong but it looks like even the developers here
on this list were not all clear on where the latency comes from or who
to ask to do something about it and if that is unclear even to some
members of an august forum such as this, then when a user like me asks
RME and gets a response like the one above he might be forgiven for
coming away with the impression that apple are the ones responsible. I
am not saying that is the truth of the matter just that that is the way
it looks to the user, and that view is definitely reinforced by the
discrepancy in latency between the same hardware running in OS9xx and
OSX.
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