Re: [Jack-Devel] jack_get_Time() used CLOCK

Am 23.02.2013 12:18, schrieb Clemens Ladisch:
> Christoph Pregla wrote:
>> Instead of CLOCK_MONOTONIC I want CLOCK_REALTIME to be used for the
>> method jack_get_time().
> Why do you want to do that?
 I would like to use Jack in connection with PTP. PTP synchronises the
system clock, however, not the MONOTONIC Clock.
> What advantage do you think this gives you?

 I would like to spend sound in different computers synchronically. I am
of use PTP for the synchronisation of the computers clocks. The output
of the sound is realised by a presentation time (like AVB). I need Jack
as an interface between network datagrams and sound (input/output).
>
> Jack *needs* a monotonic clock.
>
>> How can I implement this?
> Step 1: Replace CLOCK_MONOTONIC with CLOCK_REALTIME in the Jack source
>         code.
> Step 2: Completely redesign Jack's time handling to prevent it from
>         blowing up when NTP runs, when the user changes the system time,
>         when a summer/winter time transition happens, when the system is
>         moved to another time zone, or when the system time is changed
>         for any other reason.
ok.
The time is adjusted continuously by PTP. Major changes take place,
however not. The computers remain in the same time zone.

Regards,
Christoph

1361959377.12790_0.ltw:2, <512DD9C6.3050907 at uni-jena dot de>