[gmpi] Re: Reqs 3.9. Time - opening arguments.1
- To: <gmpi@xxxxxxxxxxxxx>
- Date: Mon, 9 Feb 2004 11:12:46 -0500
>>>
OR the host ensures that B runs before A and C, since there is a
dependancy there. Now, if there is a circular dependency ANYWHERE, you
have a latency problem. Therefore, this reduces to a previously
unsolved problem.
<<<
But A must run before B, because it lives upstream from B. A's output
is consumed by B's input...
-----Original Message-----
From: Tim Hockin [mailto:thockin@xxxxxxxxxx]
Sent: Friday, February 06, 2004 9:41 PM
To: gmpi@xxxxxxxxxxxxx
Subject: [gmpi] Re: Reqs 3.9. Time - opening arguments.1
On Sat, Feb 07, 2004 at 03:35:53PM +1300, Jeff McClintock wrote:
> Latency. Before a plugin processes a block, all it's events must be
> qued up, that includes tempo changes.
>
> Plugins are processed in order 'upstream' to 'downstream'.
>
> [A]->[B]->[C]
>
> If plug B changes the tempo, there are two ways the host can handle
it :
>
> - Host can change the tempo map immediatly, in which case C receives
> the new tempo, but A will have already used the old tempo.
>
> or
>
> - Host can propogate the tempo during the next 'block', all plugins
> receive consistant tempo info.
>
> Neither case is ideal. Either A and C see different tempo changes
> during the same song, or all tempo changes are lagged by the graph
latency.
OR the host ensures that B runs before A and C, since there is a
dependancy there. Now, if there is a circular dependency ANYWHERE, you
have a latency problem. Therefore, this reduces to a previously
unsolved problem.
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