Re: Interrupted audio
Re: Interrupted audio
- Subject: Re: Interrupted audio
- From: Jeff Moore <email@hidden>
- Date: Mon, 1 May 2006 15:14:30 -0700
One other thing, saying that OS 9 performed like you seem to think it
did, is also not quite right. OS 9 never ever performed in that way.
Glitching was just as likely there as it is on OS 9. In fact, it was
way worse judging from the bugs I had to fix there over the years. I
think you are looking at the past through some rose colored shades =)
On May 1, 2006, at 3:07 PM, Jeff Moore wrote:
If you see a bug, you should file it so we can fix it. Otherwise,
my experience has been that nearly all overloads in applications
are caused by the actual app doing something stupid, like blocking
in the IO thread on that lock that they swear is never going to be
contended for or making an API call and not accounting for side
effects (like blocking).
I can't begin to count the number of developers who have said what
you are saying only to find that when they put a real magnifying
glass on their problem, it turns out to be completely their own
making. That's not to say that there aren't bugs in the OS. I'm
positive that there are, but saying things like this is not at all
helpful in tracking these bugs down be they in the OS or the
applications. Just wishing all the apps out there didn't have bugs
that cause glitching isn't any more helpful that wishing the OS
would wave it's magic wand and make all the problems go away.
So please, if you are seeing a problem and think it is in the OS,
document it, report it and we'll fix it. It's really that simple.
Given the state of the tools today, it's not even that hard to
document anymore. Between HALLab and Shark, folks should be able to
zero in on bugs like this pretty quickly.
On May 1, 2006, at 2:51 PM, Jeremy Sagan wrote:
I know I have written about this before and I love OS X in most
respects but it just seems like a step backwards from OS 9 with
the pervasive Core Audio overloads that could be caused by the
finder or any other process allocating memory. I am hoping and
wishing that Apple can address this system level issue in a future
OS update so we can go back to the days when we were guaranteed
that audio would play smoothly and without interruption under
normal operating conditions.
Jeremy
On May 1, 2006, at 5:07 PM, Kevin Avila wrote:
There is now a Technical Q&A online that explains overloads that
may be of help. http://developer.apple.com/qa/qa2006/qa1467.html
Kevin Avila
DTS Audio Engineer
World Wide Developer Relations
Apple Computer, Inc.
On May 1, 2006, at 2:02 PM, Jeff Moore wrote:
My guess would be that the app in question is experiencing
overloads. It would be easy enough to check using HALLab's
telemetry viewer.
On May 1, 2006, at 1:54 PM, david tay wrote:
I have an USB audio device that on occasion has 0s (zeros)
inserted into the output audio stream at higher sampling rates
(eg - 96khz), causing the audio to become interrupted.
What would be the likely causes?
--
Jeff Moore
Core Audio
Apple
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--
Jeff Moore
Core Audio
Apple
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