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

Christoph Pregla wrote:
> 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.

You do know that the sound card's clock typically is completely
independent from any other clock?  Even in the case where your sound
device is using the PTP clock?

And what particular implementation of the PTP protocol are you using?

CLOCK_MONOTONIC _is_ affected by ntp changes.  How does your PTP
implementation handle adjustments?

>> What advantage do you think this gives you?
>
> I would like to spend sound in different computers synchronically.

So you have to resample it.  Why do you want to use jack_get_time() to
control that?  Can't you query the PTP clock directly?


Regards,
Clemens

1361960459.14597_0.ltw:2,a <512DDE01.9000003 at ladisch dot de>