[Bug 764900] controller: notification when last control point reached

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764900

--- Comment #3 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> ---
I can understand the user-case. The current controller design so far did not
had the need to send events, it merely automates changing parameters. Also
controller automation does not really has a notion of an "end" (e.g. LFOs).

If we want an api supporting this, one thing to consider is that sending a bus
message from the controlled element is not always the right thing, since that
part of the media has not been rendered yet. This could be handled using
sink-message events.

Having more use cases would be nice to come up with a good api.

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