Subject: Re: [linux-audio-dev] XAP: SILENT event handling
From: David Olofson (david_AT_olofson.net)
Date: Mon Dec 09 2002 - 18:08:29 EET
On Monday 09 December 2002 16.18, Steve Harris wrote:
> On Mon, Dec 09, 2002 at 03:11:51PM +0100, David Olofson wrote:
> > > I was assuming the SILENT event would be aginst a voice ID.
> >
> > Uhm, a Voice is an abstract object that has no known relation to
> > whatever audio outputs the synth may have... The SILENT event I'm
> > talking about is what a reverb FX would send when the tail goes
> > below the threshold, or that a synth would send when *all* Voices
> > that are routed (dry) to a certain audio output are dead.
>
> OK, that sounds useful, but also really hard. Realisticly a reverb
> can't tell when its gone to zero except by inspection and
> guesswork.
Well, just don't do it if it's too hard. Keep in mind though, that by
doing that, you're only moving the problem over to the host and/or
the user.
Besides, since plugins have access to their internal buffers and
variables, I would think that they practically always have a better
chance of doing a good job of this than the host or the user.
> If it has nonlienar internal behaviour it may not even
> be possible/practical. I tried to cacluate the RT60 time for
> Josep's gong model, based on the feedback levels. It turned out to
> be /seriously/ hard. Basicly not possible without actually running
> it ;)
Well, there's always the output meter hack. :-)
Yes, the host could do that - but it won't work for delays and that
kind of FX, because they can be totally silent for long periods of
time, while there is still output to come.
> I though you wanted it so that the host would know when instrument
> voices had finsihed (as in saol or csound).
Well, maybe that could be of some use, but frankly, I can't think of
anything right now.
> If you want to render tails I think its just better to have a
> postroll time like ardour (and presuamably protools).
Yeah, that's probably sufficient for practically every user.
I guess there is a reason why most plugin APIs have this feature -
but there must also be a reason why so many plugins don't implement
it. :-)
//David Olofson - Programmer, Composer, Open Source Advocate
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