[Bug 719575] multiqueue: improve for adaptive scenario

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719575
  GStreamer | gstreamer (core) | unspecified

--- Comment #2 from Thiago Sousa Santos <thiago.sousa.santos at collabora.co.uk> 2013-11-29 18:43:00 UTC ---
Created an attachment (id=263156)
 View: https://bugzilla.gnome.org/attachment.cgi?id=263156
 Review: https://bugzilla.gnome.org/review?bug=719575&attachment=263156

multiqueue: reactivate sq on reconfigure

Reconfigure is sent by input selector when a new pad is selected
as active. This should make the multiqueue's single queue active
again. Currently it relies on getting a not-linked from another
of the single queues to activate this newly selected stream.

The problem happens when the stream is switched near the EOS,
that means that no more buffers might be pushed from the old active
pad. And then no new not-linked flow return will cause single queues
activation, leading to deadlock.

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