[gmpi] Re: Topic 6: Time representation
- From: David Olofson <david@xxxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Tue, 29 Apr 2003 21:27:32 +0200
On Tuesday 29 April 2003 19.28, Angus F. Hewlett wrote:
> On Tue, 29 Apr 2003, Tim Hockin wrote:
> > > Agreed. So we have an absolute linear stream clock in samples
> > > (we'll need a 64-bit integer word for that) and an optional
> > > periodic sync pulse in the
> >
> > 32 bits is sufficient: it doesn't matter if we wrap, so long as
> > the wrap window is not too small (i.e. larger than one processing
> > block).
>
> No... some applications need absolute time to be absolute. 32-bit
> unsigned might be enough - that gives us 6.2 hours at 192KHz or
> >24hrs at 44KHz - to Mike @ Adobe, is that enough or do you need
> more headroom? (presumably this relates primarily to video/film
> soundtrack?)
Yes - but consider this: An audio buffer contains data only for the
block we're about to process. Why should an event queue contain
events that belong in the past or in the future?
Right; I can situations where it makes sense to view timestamped
events as something plugins dig out of a host managed database as
they like, but I can't see that working nicely in a real time
processing system. Just consider chaining event processing plugins in
a system that works like that, and I think you'll see what I mean.
//David Olofson - Programmer, Composer, Open Source Advocate
.- The Return of Audiality! --------------------------------.
| Free/Open Source Audio Engine for use in Games or Studio. |
| RT and off-line synth. Scripting. Sample accurate timing. |
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