[gmpi] Re: Topic 4: Host Interface
- From: "Angus F. Hewlett" <amulet@xxxxxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Tue, 1 Apr 2003 13:52:52 -0500 (EST)
On Tue, 1 Apr 2003, Marc Poirier wrote:
> Yeah, the graph is all audio / music data. But there's more to deal with
> than just the components in the graph (host communication, UIs of any
> sort, etc.). Hmmm, I'm not sure I'm following you entirely, though...
> I'm thinking to myself, "sure, that's the graph, but if that's all we had
> we wouldn't be talking about this," but I'm also feeling like I'm not
> quite seeing everything that you're getting at maybe...
I guess what I'm getting at is that every music-related change of state in
graph objects (music-related meaning things other than the basic
connection parameters of sample-rate, pin number, blocksize..., and
change-of-state meaning writing to objects rather than merely querying
aspects of their state, such as reading parameter values) should be
mediated via the graph as far as possible.
So, in the control surface example, the control surface initiates a
parameter write by sending an event down the graph from its fader, to a
midi or other input-port to the plug, which in turn does something with
the event and sends a message about its actual changed state on down the
graph towards a midi output port, which is in turn connected to the
controller. If the control event is a patch change, which will affect a
number of parameters, the plug will generate those parameter-change events
and pass them on towards the controller.
In the case of a morphing plug, it might even generate a series of
timestamped events and deliver those to the controller, causing the faders
on the control surface to move smoothly...
Regards,
Angus.
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