Re: Audio distortion after several hours?
Re: Audio distortion after several hours?
- Subject: Re: Audio distortion after several hours?
- From: Jeff Moore <email@hidden>
- Date: Mon, 6 Jul 2009 15:25:51 -0700
Without a better description of the problem, particularly what the
distortion sounds like, how often it happens, precisely when it
started, etc. There really isn't much we can do to help you out.
FWIW, the usual cause of problems like this is that somebody somewhere
has rolled over a 32 bit number. Basically, somebody is using a 32 bit
number where they should be using a 64 bit number.
On Jun 30, 2009, at 2:29 PM, Daniel Mack wrote:
we're developing USB based audio hardware and driver stacks for it
since
a couple of years, and haven't had any serious trouble for a long
time.
However, we've recently got many reports from users of newer
MacBook(Pro)s describing strange effects with audio processing after
some hours of runtime.
The first suspect was the driver, but the effects are too weird to
be explained by a simple software bug, especially because not even
unplugging and reconnecting the device (which involves destroying and
re-creating the AudioEngines from the kernel side) makes any
difference.
Sometimes, not even restarting the whole machine solves it, they say.
And the installations are all brought up to 10.5.7, which unfortunatly
doesn't help either.
Sadly, I don't have access to any machine showing the effect. But
given that there are quite some sanity checks on the hardware protocol
level and considering that the driver works pretty well on a varity of
different Mac hardware models (we've run test for severeal weeks in a
row), I more and more tend to blame some other layer for these issues,
possibly CoreAudio.
Sorry for not providing more information and more details, but that
vague reports is all I currently got.
Has anyone seen similar things recently?
--
Jeff Moore
Core Audio
Apple
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