Re: MIDI TimeCode generator
Re: MIDI TimeCode generator
- Subject: Re: MIDI TimeCode generator
- From: Herbie Robinson <email@hidden>
- Date: Sun, 18 Aug 2002 16:49:43 -0400
Hi,
I have to generate MTC from witihin my app - freerun Generator with some
initial SMPTE time.
I would like know what is the recommended way to send out quarter messages
under OS X:
- to make a packet list of all 8 quarterframes, every packet's got a
timestamp, the gap between packets is 1/fps sec. It will be MIDIserver job
to send them out in particular times (how does it work if I send them to
virtual endpoint ?)
This will potentially put the actually timing out of the computer
into an external box that can be much more accurate than the computer
can be. There is a constant that is settable by the driver you are
talking to that indicates how much in advance it would like to see
stuff (check the headers for the name).
I believe that right now, virtual endpoints will get packets that
don't happen until some future date. If they use the time-stamps on
the quarter-frames, they will end up doing the right thing...
- to make a CarbonTimer in separate thread and send out a quarter frames
every 1/fps sec ?
This can't be as accurate, because there must be more queuing delays.
Thank you
- peter
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