Subject: Re: [linux-audio-dev] Plugin APIs (again)
From: David Olofson (david_AT_olofson.net)
Date: Mon Dec 09 2002 - 01:20:33 EET
On Sunday 08 December 2002 12.11, Tim Hockin wrote:
> > > Uggh, can we keep the get() of control values simpler than
> > > events? My previos proposal had a control->get() method and a
> > > ctrl->set() method. Obviously, the set() is superceded by
> > > events. Is the get, too?
> >
> > What is this for? If you want to implement this then they need to
> > be events (well, sample accurate), but they sound like a pain to
> > implement.
>
> Well, my first thought is that we don;t want to send a CTRL_CHANGE
> event to the host every time a control changes,
Why not? Just like the host isn't supposed to flood the system with
events, neither are you, as an event generating plugin. (And there's
a reason why some APIs have ramp events and the like.)
> Do we want the
> host to have to send CTRL_GET events and wait for CTRL_VALUE
> events, or can we say 'one tick granularity is all the host can
> get' wrt CTRL_GET?
Well, either could work... I don't see any major advantages with
either, except that the event based approach can be made sample
accurate with minimal effort.
(Copy the timestamp field. In fact, the way I do events in Audiality,
you can even reuse the event struct of the request, rather than
throwing it away and allocating a new one for the reply.)
//David Olofson - Programmer, Composer, Open Source Advocate
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