Re: [chrony-users] Using radio time signal for syncronization

[Miroslav Lichvar <mlichvar@xxxxxxxxxx>]

On Tue, Jan 07, 2025 at 02:49:52PM +0000, Sviatoslav Feshchenko wrote:
> I might take Miroslav's suggestion and port the ntpd audio code.
> This would be a hobby project, so I am not looking for the easiest
> porting solution. I would also want the code to last and be relevant
> for the longest amount of time possible, so I would probably write
> directly for ALSA rather than pipewire, to minimize the risk of
> obsolescence. I wouldn't use the SOCK wrapper ntp-refclock in this
> case either, and instead write a standalone application (somewhat
> along the lines of gpsd), which would provide the SOCK connection.
> What are your thoughts on this approach?

That sounds like a lot of work, but of course it's your time :). I'd
just submit a patch adding support for alsa to the ntp project.
Looking at the ./libntp/audio.c file, it shouldn't be that difficult.

alsa provides an alsa-oss package providing some OSS compatibility.
You could start ntpd/ntp-refclock with the aoss utility. Have you
tried that?

> If I am ever successful and
> it works well, would Miroslav be willing to include a blurb about
> the existence of this application in chrony documentation for
> chrony.conf SOCK driver, which currently only mentions gpsd as one
> application that supports the SOCK protocol?

I'd certainly add it to the "Useful links" page on the chrony website.

-- 
Miroslav Lichvar


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