Re: more AU info and plugins (should be "I need to share data")
Re: more AU info and plugins (should be "I need to share data")
- Subject: Re: more AU info and plugins (should be "I need to share data")
- From: Andrew Kimpton <email@hidden>
- Date: Sat, 21 Jun 2003 14:13:50 -0700
I'm coming to this thread a little late (and perhaps my point/question)
is what started this all, but consider the following three pieces of UI
information that are all pretty common in an Audio Effect or processing
plugin.
VU Meter,
Waveform display (Amplitude over time)
Frequency display
In these cases the data under examination is changing very rapidly (in
the DSP part of the plugin), it might be changing as rapidly as the
buffer rate, but even if we 'slow' the rate to that of the screen
(what's the point of displaying more frequently than screen updates ?)
The rate of the data is still 60-85Hz
The quantity of data is also large in the last two cases, probably a
'buffer' or 'array' of between 256 & 512 32bit floating point values (ie
1-2KBytes of Data), there are probably other examples of realtime
display with even more data.
These are simple bounded examples, is the decision (feeling) that they
are too large and of too high a rate to be handled through Get/Set
Property ? If so the UI implementor has no choice (these displays are
must have's in many processing plugins) but to 'reach over the wall' and
obtain or maintain some other reference, pointer or communications
channel with the DSP Component.
If such behaviour is felt likely to break apps in the future, or even
break them now then someone (Apple) should set some strong guidelines
and provide alternatives or workarounds where appropriate. Or make it
clear to the app vendors that they should do nothing in their
applications to break the above mechanisms of access.
I've not (yet) seen AudioUnits performing this sort of visual feedback
(though I've not looked as hard as I might across the list of units on
OSXAudio.com) perhaps the lack of guidelines is why - it certainly gives
me pause before rushing to implement a plugin with such UI features.
Andrew 8-)
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