1. Ok, that was what I was afraid of. But let me rephrase the
question then. Is there a list somewhere with which protocols are in
place today for iTunes? The Visualizer template, do that contain all
of them already?
A protocol is just a defined way to get data into and out of a
composition. All the protocols are listed in the Protocol Conformance
dialog (option-cmd-P):
(The QuartzBuilder Application isn't there by default -- that's from a
kineme.net product)
iTunes only obeys the Music Visualizer protocol -- a composition can
obey more than 1 protocol, but an app will only ever make use of the
ones it was designed for.
When you add a protocol (through this dialog, or when creating a new
composition from a template), it'll add _all_ the required inputs/
outputs, and _all_ the optional inputs/outputs. So what you see is
what there is.
2. And for future reference, is there a list with other applications
protocols that Apple provides? Maybe I will hit the same snag when
doing something for iphoto, iMovie etc.
The list above is all of them. Applications will pick compositions
that support the protocols they require (iTunes selecting Music
Visualizers, for example), but I don't know if each app will let you
know what protocol it's looking for. (In many cases it's implied, but
sometimes it's not so clear)
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