[gmpi] Re: Topic 6: Time representation
- From: RonKuper@xxxxxxxxxxxx
- To: gmpi@xxxxxxxxxxxxx
- Date: Tue, 29 Apr 2003 13:33:04 -0400
> The idea of sample-based absolute timestamp and periodical
> syncronization events (for exact adjustments) seems to be quite sane.
Sorry, I beg to differ.
One can imagine using GMPI to implement a MIDI only plugin. It seems that
MIDI data should be processed solely in musical time.
Soft synths would naturally want incoming musical events (MIDI or whatever)
to be expressed on a musical timeline, but rendered on a sample timeline.
The host could convert musical events to a sample timeline, but what if we
adopt a note event structure that has an implicit duration? Then the
note-off time (in the future) become corrupt if the tempo changes between
note on and note off. Not so if note times and durations were expressed in
musical units.
>>>
The one potential problem with this scheme is that it is not good for
dealing with plugins that want to have knowledge of "future" events beyond
the end of the current process block.
<<<
MIDI quantizers and arpeggiators fall into this category. It's not only
about being able to deal with tempo changes, its about being able to
position musical (output) data on the song's timeline without worrying the
position might change later.
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