[gmpi] Re: Topic 6: Time representation
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Wed, 30 Apr 2003 15:31:11 -0700 (PDT)
> Well, since I am talking about a vested interest here, let me explain.
> In an audio/video editor, you always have to frame rates (A and V) in
> your timeline. In order to choose a time quanta that evenly divides into
> both, audio sample rates are not sufficient. For example, take NTSC
> Digital Video with a video rate of 30000 / 1001 and a audio sample rate
> of 48000. My time quanta needs to be a number like 1441440000 quanta per
> second.
Ok, I can buy the need for this. Since this is supposed to be an audio API,
I would suggest that we define the audio sample rate and the sub-sample rate
as sub-samples per sample. Objections?
> > I don't get this. How does the host know how to quantize like this.
> > Better, perhaps to just get a BEAT event and subdivide that internally. But
> > if plugins start relying on this, then we have to assume we send meter
> > events when the transport is stopped, which is weird..
> >
>
> The meter events would only flow while transport was not stopped. The
> host knows its timeline. So it knows how to calculate the exact position
> in quanta of any event, after taking into account tempo changes. So
> every meter event simply contains a duration, which is the delta in time
> before the host is going to send the next meter event.
I still don't get the point of this. Or how the host knows to quantize a
3/4 bar into 2+1 and not 1+2.
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