[gmpi] Re: wrap up 3.8 - gesture start/end

  • From: Chris Grigg <gmpi-public@xxxxxxxxxxxxxx>
  • To: gmpi@xxxxxxxxxxxxx
  • Date: Tue, 13 Jan 2004 17:01:48 -0800

Marc wrote:

--- Chris Grigg wrote:
Tim wrote:
host->get_gesture_id(); 

 You probably just meant that as a shorthand, but just in case: How
 exactly does a control surface call a host function?  So we might
 want to structure that as a message-based transaction instead.  (Or
 were you thinking that there'd be some kind of driver interface on
 the host for control surfaces...?)


A control surface can't do any direct interaction with GMPI, setting
parameters or anything like that.  Somewhere, there will be some software
layer doing the communication to and from the hardware, either a driver or
a plugin or the host itself, but somewhere there will be software for the
control surface.

(And Tim wrote something similar.)

Well... that's one of the ways of doing it, but not necessarily the only way. Consider the case of MIDI Machine Control, where a control surface can control stuff inside a computer without requiring any control-surface-specific driver or configuration/set-up at all, because the communication is message-based (and the message formats are pre-standardized). If the GMPI host could be controlled by messages and not just function calls, then you have a possibility for smart control surfaces that just speak and listen GMPI directly (protocol could be IP or Ethernet, etc.; transport may be USB, Ethernet, 1394, IAC, even MIDI-DIN); if not, then drivers and config files is all it'll ever be able to do. There are also obvious networking & interconnecting opportunities here, just like with the remote GUI issues. Really, gesture control on a control surface is just a special case of remote UI, so why treat it differently from the remote machine GUI support we (I believe...?) already agreed we should have?

Anyway, this is a side-topic, so everyone should feel free to just drop it.

-- Chris G.

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