Re: Video JACK?, was Re: [linux-audio-dev] What about OpenML? Some questions

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Subject: Re: Video JACK?, was Re: [linux-audio-dev] What about OpenML? Some questions
From: Jelle (jelle_AT_defekt.nl)
Date: Tue Oct 16 2001 - 22:18:05 EEST


On Tue, Oct 16, 2001 at 10:09:46AM -0400, Paul Davis wrote:
> >I was suggesting that maybe OpenML could provide some processing
> >advantages if it was integrated in a LADSPA host, by for example,
> >letting all the mixing and equalizing be done by hardware... (ignoring
> >OpenML's lack of callback model and latency issues, zero-copy gone etc)
>
> what hardware? OpenML is vaporware at this point. and besides, the
> hardware that many of us find interesting doesn't do this stuff
> anyway, and likely never will.

How about the pulsar? And your delta 10/10, that one has mixing, eq and
monitor level dsp code, right?

I was thinking maybe the interface to suchs functions could be generalized
using OpenML?
 
> >would you, at all, be interested in extending JACK to mediate video
> >connections between software (even with variable clock rates)?
>
> if you can see some way to do that, then sure. personally, i
> don't. the whole model upon which JACK is based is a single periodic
> "tick" source (not necessarily with a regular period, however) driving
> the execution of a number of clients by telling them "do whatever you
> have to do within <time period>", where the time period is currently
> denoted in audio frames, but should probably include a temporal
> interval as well or instead. thats where the "perfect sync" comes from
> - everyone's doing whatever their thing is at the same time for the
> same time.
>
> i don't see how you can fit a client into that scheme which
> needs/wants to be driven by another clock source. however, if you can,
> then great, since MIDI needs this kind of functionality as well. let
> us know what you have in mind.

I have some ideas on this, though they are more focussed on in-application
stuff. It should be possible to extend it to cross-app.

However, it will have to wait for a while, exams are coming up after this
weekend. I'll write some about it soon and post it, okey?

cheers

-- 
jelle herold (defekt)   http://defekt.nl/
seeing digital          http://channelthree.net/


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