[Denemo-devel] [bug #30411] Rapid MIDI note entry can beat MIDI filters

[Richard Shann]

URL:
  <http://savannah.gnu.org/bugs/?30411>

                 Summary: Rapid MIDI note entry can beat MIDI filters
                 Project: GNU Denemo, a gtk+ frontend to GNU Lilypond
            Submitted by: rshann
            Submitted on: Sun Jul 11 10:41:42 2010
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: In Progress
                 Privacy: Public
             Assigned to: rshann
             Open/Closed: Open
         Discussion Lock: Any

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Details:

The action d-GetMidi calls a function intercept_midi() which diverts the next
MIDI input event, restoring the usual path after it has intercepted one
event.
MIDI filters are currently scripted to call this repeatedly, which means that
if you play notes in rapidly you can get events past the filter during the
time when the script is processing one MIDI event and before it has asked for
another.
I think this could be fixed by creating a new command d-MidiDivert which
would stop d-GetMidi turning off the divert mechanism. (d-MidiDivert #f) would
turn this flag off so that the next MIDI event received would turn off the
MIDI filtering.
That provides good backward compatibility, but it might be awkward to
program, since you generally don't know you want to stop the filtering before
you receive the last event.




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