Re: Host Time epoch
Re: Host Time epoch
- Subject: Re: Host Time epoch
- From: Doug Wyatt <email@hidden>
- Date: Thu, 10 Feb 2005 12:53:01 -0800
Steve has a case where an audio device's sample time appears to be
moving backwards.
I am not aware of any situations where the system's host time goes
backwards. More fundamental things than MIDI would probably break if it
did.
Doug
On Feb 10, 2005, at 12:21, John Iversen wrote:
Steve,
Sorry, I'm not aware of this issue, but it's of interest to me, and
is rather fundamental. Would you mind elaborating? What is the nature
of the non-monotonicity--I can't imagine you mean actual reversals in
the host time, I hope. Instead, do you mean that the rate of increase
of the HostTime is variable, so it drifts away from 'real time'? How
large is the effect in your experience?
To take a concrete example: Given that MIDITimeStamps are based on
'HostTime' (right?), are you saying that if midi events are received
in at exactly 1 sec intervals the increases in Host time (as seen in
the MIDITimeStamp of incoming packets) would not be identical (give
or take some small margin of error)? If that's really the case, I
don't see how any sequencer could possibly work reliably and not show
tempo drift, so I may not be getting the drift of what you're talking
about here.
Thanks,
John
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