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MIDI data with timestamps in the future?
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MIDI data with timestamps in the future?


  • Subject: MIDI data with timestamps in the future?
  • From: Pete Yandell <email@hidden>
  • Date: Tue, 23 Jul 2002 18:20:28 +1000

According to the documentation for MIDISend:

"Events with future timestamps are scheduled for future delivery"

Unfortunately this doesn't seem to be true in practice.

I've had a report from somebody using CoreMIDI to send data through a
virtual endpoint to my application (SimpleSynth) that packets injected
with future timestamps are played immediately by SimpleSynth.
Internally SimpleSynth simply passes incoming MIDI data to the built-in
synth audio unit.

My question is this: whose responsibility is it to actually delay the
packets? I would have thought it was up to CoreMIDI. If I have to do
it myself, my app gets a lot more complicated...I would have to add
parsing of MIDI data and some fairly complex scheduling code.

I'm currently trying to put together a complete test...I'll post again
when I have.

Pete Yandell
http://pete.yandell.com/
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