[gmpi] Re: 3.9 Time wrap up - UST
- From: "Martijn Sipkema" <m.j.w.sipkema@xxxxxxxxxxxxxxxxxx>
- To: <gmpi@xxxxxxxxxxxxx>
- Date: Wed, 10 Mar 2004 19:56:04 +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.
> 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.
> 3) There must be some way to calculate the UST for any sample. Either the
> host exposes a UST_per_sample scalar or there is a host callback or
> something. The host is responsible for recalibrating any scalar
> sufficiently often as to avoid drift.
Two UST/MSC pairs allow inter- or extrapolation.
--ms
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