[gmpi] Re: 3.9 Time wrap up - UST
- From: "Martijn Sipkema" <m.j.w.sipkema@xxxxxxxxxxxxxxxxxx>
- To: <gmpi@xxxxxxxxxxxxx>
- Date: Thu, 11 Mar 2004 10:37:05 +0100
> > [...]
> > > 1) The host or audio driver snapshots the UST when the buffer becomes
> > available
> > > for a process() run.
> >
> > An UST/MSC need not necessarily be for the MSC of the first sample
> > in the process() callback. It would be a reasonable requirement for
MSC/UST
> > pairs obtained in different process() callbacks to have differing MSCs.
>
> not necessary, but sufficient, right?
Yes, but if the hardware/driver supports timestamping and does this at some
other MSC then it would make sense to use that.
> This is actually superceded by #3
> below. A plugin must be able to find the UST for any sample frame.
It should do that itself though.
> > > 2) Plugins are notified of this UST time along with the sample counter
> > when
> > > they are called for process(). This might be an argument to process()
or
> > an
> > > event, or a host callback - it doesn't matter for now.
> >
> > One would also need the MSC for (the first sample of) every buffer in
> > a callback.
>
> MSC is just the sample frame counter, right?
Yes.
--ms
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