[LAD] JACK Graph Internal Latency? (was Re: A small article ...)

hermann brummer- at web.de
Thu Apr 29 10:06:50 UTC 2010

>From my experience it's a question of client design.
To loop a jack-client in a other jack-client there must be explicit
call's to the jack_buffer. Mean when I send out the data to the
jack_buffer, to a other client, I must make again a call (in the same
callback process) to the jack_buffer to recive the data. 

port_1(get_buffer) -> outside_client -> port_2 (get_buffer)

Most jack applications be designed to receive the buffer for all ports
in one call.

 for (int i = 0; i < 2; i++)
            gInChannel[i] = (float
*)jack_port_get_buffer(input_ports[i], nframes);

process loop;

for (int i = 2; i < gNumInChans; i++)
                gInChannel[i] = (float
*)jack_port_get_buffer(input_ports[i], nframes); 

greats  hermann

Am Donnerstag, den 29.04.2010, 13:44 +0400 schrieb Louigi Verona:
> Well, from what Paul said it appears it is not Qtractor, it is the
> same with Ardour and basically just any loop connections setup.
> Or am I getting it incorrectly? Let's wait for what Paul has to say %)
> On Thu, Apr 29, 2010 at 1:32 PM, Ralf Mardorf
> <ralf.mardorf at alice-dsl.net> wrote:
>         Louigi Verona wrote:
>                 My version is 0.44, I think. pretty late one, I
>                 compiled ot from git in February or January.
>                 I can try another version or another app for that
>                 matter. But let Paul tell us if it makes sense at all.
>         I guess Rui programmed buggy for Qtractor, it wasn't a fault
>         for JACK1 or JACK2. Perhaps 4.4.5+ is needed.
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