[Devel] callback on parameter change?

[David Robillard]

On Tue, 2012-01-17 at 20:47 +0800, Ricardo Wurmus wrote:
> Hi *,
> 
> is there a callback that hosts use to notify a plugin that lv2:ControlPort
> parameters have been modified?
> 
> Background:
>   Now that I've removed all plugin-internal handling of MIDI CCs that would
> affect lv2:ControlPorts, I have no way of performing a few extra calculations
> on parameter changes. Previously, I could have run a function to update the
> internal parameters dependent on the new values provided at the
> lv2:ControlPorts.
> 
> I would prefer to keep these calculations out of run() and only perform them
> when really needed.

Store the old value and compare them.

-dr