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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] PPS refclock on Macs
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Thu, 5 Jun 2025 09:13:56 +0200
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On Thu, Jun 05, 2025 at 12:29:56PM +0700, James Clark wrote:
> The second approach works quite a bit better than the first, which I
> attribute to kernel support in macOS for timestamping audio and to USB
> audio being isochronous. There's a constant error of about 0.35ms, but once
> you correct for that the jitter is in the few microseconds range.
>
> I wrote it up here: https://github.com/jclark/mac-pps
Nice.
Is that offset stable across reboots and suspends?
It would be nice if this driver could support also other systems, but
I'm not sure if there is a library for low-latency audio that works
well on different systems.
--
Miroslav Lichvar
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