[gmpi] Re: Reqs 3.9. Time - opening arguments.1

  • From: Tim Hockin <thockin@xxxxxxxxxx>
  • To: gmpi@xxxxxxxxxxxxx
  • Date: Thu, 5 Feb 2004 18:01:28 -0800

A niggle:

On Thu, Feb 05, 2004 at 02:24:44PM -0500, Paul Davis wrote:
> You know that the video frame N was drawn at UST U2. You know that the
> audio frame S was processed (whatever that means) at UST U1. You know
> that N and S should have some defined temporal relationship, measured
> in the same units as UST, and inferrable from knowing video and audio
> frame rates. You can therefore sync the two streams. Without UST, you
> can't do this in any even vaguely simple way.

but later you said:

> OK, now i see what you have a problem with.
> I'm sorry. I was talking only about stamping the process() "event"
> (think back to some of the XAP discussions), and events received
> "realtime" from external devices.

So if you only UST stamp the start of process() and any realtime inputs, how
to you arrive at the phrase "audio frame S was processed (whatever that
means) at UST U1".  Do we have to UST stamp every frame, or is it an
assumption that all frames in a sample block have the same UST?

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