[gmpi] Re: New Reqs 3.8 - Events
- From: RonKuper@xxxxxxxxxxxx
- To: gmpi@xxxxxxxxxxxxx
- Date: Tue, 23 Dec 2003 10:34:08 -0500
This is sounding great, but I've got one question. You wrote:
>>>
[a] GMPI shall support tempo maps, to be provided to plugins as one
polynomial spline per sample buffer, one such tempo map per channel or group
of channels.
[b] GMPI shall provide an API to plugins for converting from music time on a
tempo map to sample frame position, and vice versa.
[c] GMPI shall provide an API to plugins for creating and destroying tempo
maps, getting and setting tempo maps by identifier, and getting and setting
the elements of tempo maps.
<<<
If we have [b], we do we need [a]? To me [a] suggests that as a host I'll
need to always fabricate splines for the plugin. I'd much rather expose an
API to my tempo map, and let the plugin do time conversions via [b].
If we do [b], we could also consider the idea of multiple tempo map(s).
Conversions are done with a tempo map ID kind of idea. But I think that is
implied by [c].
Also, [c] suggests that a plugin might be possibly holding/caching a tempo
map. This feels like a bad idea to me. The host should own the tempo map,
even though we let the plugin create it if needs to.
So maybe a more succinct statement of the requirement is:
[a] GMPI shall provide an API to plugins for creating and destroying tempo
maps, getting and setting tempo maps by identifier, and getting and setting
the elements of tempo maps.
[b] Plugins cannot cache tempo maps. They can cache tempo map identifiers,
for use in various tempo APIs.
[c] GMPI shall provide an API to plugins for converting from music time on a
tempo map (ID) to sample frame position, and vice versa.
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