Re: Is there any clock drift compensation mechanism in the HAL?
Re: Is there any clock drift compensation mechanism in the HAL?
- Subject: Re: Is there any clock drift compensation mechanism in the HAL?
- From: Jeff Moore <email@hidden>
- Date: Mon, 23 Feb 2004 12:22:52 -0800
The HAL deals with devices on an individual level and consequently has
no basis to judge drift or have anything to compensation for it.
The AudioThru sample code doesn't really concern itself with drift
between devices too much. It buffers the input sufficiently to keep the
output from starving.
The HAL does provide enough information that an application could
control a varispeed unit to do the compensation though.
On Feb 16, 2004, at 9:28 AM, Stiphane Letz wrote:
Hi,
I am looking at the /Developer/Examples/CoreAudio/HAL/AudioThru/
example that allows to make an audio thru from one CoreAudio device to
another CoreAudio device.
What happens if the 2 devices are actually from 2 different audio
cards that do not run at the exact same sample rate because of
difference in hardware clocks?
Does the HAL contains a system able to compensate any clock drift
differences between the two different devices in this case?
--
Jeff Moore
Core Audio
Apple
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