Re: IOProc never called after AudioDeviceStart
Re: IOProc never called after AudioDeviceStart
- Subject: Re: IOProc never called after AudioDeviceStart
- From: Jeff Moore <email@hidden>
- Date: Wed, 29 Oct 2008 20:06:43 -0700
On Oct 29, 2008, at 6:40 PM, Mitch Jones wrote:
On Oct 27, 2008, at 11:51 AM, Jeff Moore wrote:
If you aren't seeing any errors, and you are 100% positive that
there is no race here, then perhaps there are some other things at
play here.
Does this happen with all audio devices? If not, which devices does
it happen to and which doesn't it happen to?
The audio devices I've tried are Built-In Line Output and Built-in
Output on the Mac Pro and Built-in output on the Macbook Pro.
Neither of which produced sound. These are the only output devices I
have.
OK, but it would be helpful to test with devices other than the built-
in device if you get a chance.
Have you sampled your process to see what all the threads are
doing? You could have something else going on that is interfering
with the HAL's ability to field notifications from the driver. This
usually would show up as the process having an IO thread that is
stuck waiting for a notification or waiting for the device's first
time stamp.
I presume that would be IOA_SingleDevice::StartIOCycleTimingServices?
That method would show up in one of the possible stacks, yes.
--
Jeff Moore
Core Audio
Apple
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