[wdmaudiodev] Re: MIDI Capture Timestamping
- From: Mathieu Routhier <MRouthier@xxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 5 Aug 2003 17:00:55 -0400
The master clock is provided to you as a reference clock. When the note
comes in from your hardware, the time stamp should be relative to this clock
depending on how you want it time-stamped (how long before or after the
current time, if that applies). Why do you need to use another clock?
Btw, lately, we had to debug our midi input port timestamps because of a
problem we noticed with sonar: there seems to be an increasing skew between
the application clock and the midi timestamps. The longer the application
was opened, the longer it took for a note to be processed by the
application. Restarting the application reset the skew. When the
application was configured to ignore the timestamps, the problem
disappeared. We finally found out that the problem was in the application's
way to handle the timestamps. Apparently Cubase has the same problem.
I suppose some of you already dealt with this (or at least heard about this
issue). I was wondering if there was something you'd like to add to the
discussion.
Mat
-----Original Message-----
From: BlazeAudio Developer [mailto:developer@xxxxxxxxxxxxxx]
Sent: Tuesday, August 05, 2003 3:09 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] MIDI Capture Timestamping
Can anybody tell what the ullPresTime100Ns in DMUS_KERNEL_EVENT is supposed
to be?
It's in 100 ns units - but is it the absolute system time or is it relative
to some other event.
We have a MIDI capture driver(portclass miniport) where we cannot just use
the MasterClock object provided in IMiniPortDMus::NewStream call.
Thanks.
Devendra.
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.de/
Other related posts:
