[gmpi] Re: Reqs 3.9. Time - opening arguments.1

  • From: David Viens <davidv@xxxxxxxxxx>
  • To: gmpi@xxxxxxxxxxxxx
  • Date: Sat, 7 Feb 2004 08:00:38 -0500

Hi again

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'.


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.


- 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.

A clever plugin, aware of the graph latency, could probly sync the host
successfully to incoming audio, but it's not straightforward.

Jeff, you are right on track!

Your later approach is what i first proposed a while ago:

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