Re: presets, parameter value properties, tracking
Re: presets, parameter value properties, tracking
- Subject: Re: presets, parameter value properties, tracking
- From: Paul Davis <email@hidden>
- Date: Sat, 01 Dec 2018 17:42:51 -0500
On Sat, Dec 1, 2018 at 5:24 PM Paul Davis <email@hidden>
wrote:
> here at ardour HQ we're trying to figure how we're supposed to do
> something that we want to do: indicate to the user when the parameters of a
> plugin, previously set by a preset, have been subsequently modified by the
> user.
>
> the problem comes from the fact that when PresentPreset is set on a
> plugin, it notifies property listeners about the change in the
> PresentProperty value. Great!
>
> but then according to apple docs and other code, we are supposed to call
> AUParameterListenerNotify() with AnyParameter as the parameter ID, so that
> all listeners get notified about the (potentially) new values of all the
> parameters. Ardour is itself a listener.
>
> The notifications occur in this order, so there is no way sensible to know
> when the notifications that we've triggered by using AnyParameter have
> finished.
>
> This means that managing a flag that indicates "all parameters have a
> value that comes from a preset" seems hard, because we don't know whether a
> ParameterValueChanged notification comes from:
>
> (1) a preset change itself (specifically, us notifying all listeners
> about it)
> (2) the plugin GUI being used to change a parameter on its own
> (3) some other GUI (eg. host provided) being used to change a parameter
> on its own
>
> Can anyone recommend a "best practice" here, if there is one?
>
ps. one idea we've had is to queue some other notification that will be
delivered *after* all the parameter value change notifications are done,
but we have no idea what that might be.
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