[gmpi] Re: Topic 4: Host Interface

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

In process.  Out of process plugins can be done via a proxy plugin.  As part
of the SDK, we can maybe do an out-of-process proxy demo.  Simple delivery
of messages/data via SysV IPC or similar.  As a demo.

> 3.  Is the host a plugin too?

Hosts can be a plugin.  It should be easy for the host to be made into a
GMPI plugin.  In fact, if we make this hard or impossible, we screwed up
with GMPI.  It should be simple to make a simple host-isa-plugin.

> 4.  Can the host be a chain of simpler plugins (sequencer, timeline,
> automation)?

Undefined - a host needs to provide system-level services such as timeline,
but the host can choose to do these as plugins.  This implies that all
system-level info such as tempo, meter, play-position, etc MUST be treated
as arbitrary control data, and NOT as something special.  The Plugin API
must be generic enough to allow all those things to be plugins.  Whether it
realistically makes sense or will ever be done that was is irrelevent.

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

Transport, yes, UI is a separate can of worms.


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