[gmpi] Re: Time Summary (was *Ping*)
- From: "B.J. Buchalter" <bj@xxxxxxxxxx>
- To: "gmpi@xxxxxxxxxxxxx" <gmpi@xxxxxxxxxxxxx>
- Date: Sat, 17 May 2003 14:34:08 -0400
on 5/17/03 12:22 PM, Paul Davis at paul@xxxxxxxxxxxxxxxxxxxxx wrote:
>>> Imagine you have relatively large buffers (30 ms or more). Realtime events
>>> can happen while a timeslice is being processed. If the buffer is even
>>> larger, the user could reasonably click new events into the sequence while
>>> the event's (scheduled) timeslice is running. In this case, can you
>> actually
>>> schedule the event with sample accuracy in the current pass through the
>>> graph?
>>
>> within the 30ms you don't know when and in how many time your buffer will be
>> processed. This could happend at the ms number 5 during 15 ms, this can
>> happend at the ms number 1 and takes only 1micro second. And in this case ,
>> sending new event incoming at ms number 20 won't be processed because it's
>> simply already done !
>
> hurrah! vincent and i agree on something! break out the champagne!
> (though i'd probably prefer a bottle of vouvray :)
And Angus wrote:
> Vincent is correct. GMPI plugins cannot respond to events received during
> a buffer-processing slice. They must always be scheduled for the next
> available slice.
That was not a question -- it was a posit. As I said in the next sentence of
my post:
"Of course not; if the user chooses to use really large timeslices,
the scheduling accuracy of realtime events will be compromised. But playback
of those events will not be because the host can schedule them into the
buffer."
The point being that the control latency constraints of processing realtime
input are clearly more stringent than the constraints of processing
timestamped events. This is what you guys were areguing with Vincent about
in the first place. I simply want the solution to extend to proxies that
support timestamps to devices that have control transport latency.
Best regards,
B.J. Buchalter
Metric Halo
M/S 601 - Building 8
Castle Point Campus
Castle Point, NY 12511-0601 USA
tel +1 845 831-8600
fax +1 603 250-2451
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