[gmpi] MIDI: Proposed Requirements (wrap up try #1)

Woops, I meant to change the subject...

On Wed, Jun 23, 2004 at 02:26:25PM -0700, Tim Hockin wrote:
> So how can we encapsulate what we've been discussing into requirements?
> Obviously, Chris' proposal (with updates as discussed since then, right
> Chris :) will be included or linked to in the More Info section.


Proposed reqs for Section 3.15 "MIDI".  I am sure there are more that are
needed, and some rewording.  Suggestions?


* GMPI must provide complete interoperability with MIDI controllers.  It
  must be possible to control plugins within a GMPI graph with MIDI input.
  MIDI input must be sent through the host like all GMPI events.

  MORE:  For every MIDI message, there must be a corresponing parallel in
  GMPI.  It must be possible to losslessy transcode a MIDI event into a
  GMPI event and back. A basic proposal covering the details of this
  transcoding has been developed. <link>

* Plugins must be able to expose a preferred MIDI map, which allows the
  host to configure some automatic MIDI control of the plugin.

  MORE:  It's probably OK to limit this MIDI map functionality to the
  following MIDI messages: 7-bit CC, 14-bit CC, RPN, NRPN, note-on,
  note-off, pitchbend, channel aftertouch, and poly aftertouch.

* Plugins must be controllable through host-based MIDI-learn.  This allows
  the host to map any incoming MIDI controller to any parameter.

  MORE:  This is "click and wiggle" functionality.  The user selects a
  parameter, then sends a MIDI controller message.  That MIDI control is
  bound to the specified parameter.  It's probably OK to limit this
  functionality to the following MIDI messages: 7-bit CC, 14-bit CC, RPN,
  NRPN, note-on, note-off, pitchbend, channel aftertouch, and poly
  aftertouch.

* It must be possible for GMPI plugins to receive MIDI SysEx messages.
  GMPI hosts must not modify SysEx messages in any way.

* It must be possible for plugins to send MIDI.

  MORE:  One possible mechanism for plugins to send MIDI is for hosts to
  provide a GMPI->MIDI output plugin.  Another possible option is for GMPI
  to define a host-based API for accessing virtualized MIDI outputs.

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