[gmpi] Re: Topic 4: Host Interface

1.  Are plugins run in-process or out-of-process?

In-process, but they are allowed to be a proxy for an out-of-process or
network implementation.

2.  What kinds of special needs are there in events to/from a plugin?

Support representations of music adequate to experimental composition
(multiple overlapping meters and tempos, microtonal tuning systems, very
dense textures, different data types perhaps defined for a piece. This is
one of the critical requirements for the protocol.

This in turn mandates the ability for event data to be transmitted over a
channel with data types defined by negotiation between host and plugin.
This opens a can of worms but I am confident that a reasonably simple
solution can be achieved. Passing events as arrays or count + varargs of
tagged variants would probably do the job, with a generous assortment of
defined types in the variant.

3.  Is the host a plugin too? AND 4. Can the host be a chain of simpler
plugins (sequencer, timeline,
automation)?

The host should be a plugin, plugins should be able to host plugins, and in
general the host and each plugin should be considered a node in a
synchronous data flow graph. In my view this is one of the most critical
requirements of the protocol, together with control data.

5.  Does the host interface provide transport control, UI updates, track
information?

The host should provide simple transport control and data state updates. 


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