I am personally OK with not having a GMPI-defined UST. I believe that
all of the systems we are talking about running on have some form of
independent clock. So if the plugin needs it, it can do it with a system
call, or if it is cross platform, it can wrap the system calls per
platform. Then it can get the system time at a particular GMPI audio
time when it starts, and use that for any comparisons that it needs.
While there may be a bit of utility (for plugins) added by having GMPI
do the wrapping (i.e., making the host do the wrapping), I think it is
more than offset by the complexity of having another time in addition to
the 2 that seem to be shaking out of the discussion.
Mike
RonKuper@xxxxxxxxxxxx wrote:
did you read my followup posts about syncing with an external streaming clock like video? <<<
Just now... sorry about that.
Mike may correct me, but I think in environments where you are doing hard sync of audio to video, there is a house clock that is connected via hardware to the audio sample clock. If an audio plugin only gets to chase frames at a frame boundary, it becomes really hard to keep audio smoothly in sync without catastrophically dropping samples.
So in other words, even in the video sync situation, the free runnning audio sample clock is still king.
-----Original Message-----
From: Paul Davis [mailto:paul@xxxxxxxxxxxxxxxxxxxxx] Sent: Thursday, February 05, 2004 10:57 AM
To: gmpi@xxxxxxxxxxxxx
Subject: [gmpi] Re: Reqs 3.9. Time - opening arguments.1
I don't believe "universal time", aka, "the time on the musician's studio wall" is necessary. For all intents and purposes the monotonically increasing sample position is the time.
did you read my followup posts about syncing with an external streaming clock like video?
there is no suggestion that UST be used as "the time" within GMPI.
--p
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-- Mike Berry Adobe Systems
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