[gmpi] Re: Topic 6: Time representation
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Fri, 2 May 2003 12:33:49 -0700 (PDT)
> That's exactly how I saw it working. Event-processing plugins that don't
> mess around with tempo or time will just pass events on to downstream
> plugs.
I don't like the idea of passing things downstream. A plugin should not see
events that are not meant for it.
> The only complication is in developing merger filters, they will have to
> allow (the user?) to select which inbound port's time context to honor.
Or you let the merger subscribe to a time context itself by receiving tempo
information. If it is the same as one or more of the feeders, great! If
not, cope!
> note and other musical events. However, if they are to flow downstream in
> the same way, each plug must have a unique target-ID, such that it can
> identify parameter messages intended for it. In the above case, the MIDI
> processing plug needs to be able to ignore parameter events for the audio
> plug sitting downstream.
What we did with XAP was this: At init time, the plugin is asked for one
event-target for each control. The event-target is a tuple of {list-head,
cookie}. The Plugin provides the cookie which is meaningful within itself.
When events get delivered, they include the cookie for their destination.
Thus a plugin always knows which target was intended, even if it has only
one list-head. Further, it allows the plugin to decide how many actual
queues to sort events into, and how to arrange them.
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