[Bug 770225] multiqueue: High CPU usage with multiple audio tracks in playbin3

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770225

--- Comment #8 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 334122
  --> https://bugzilla.gnome.org/attachment.cgi?id=334122&action=edit
multiqueue: Fix high_time wakeup logic

When calculating the high_time, cache the group value in each singlequeue.

This fixes the issue by which wake_up_next_non_linked() would use the global
high-time to decide whether to wake-up a waiting thread, instead of the group
one, resulting in those threads constantly spinning.

Tidy up a bit the waiting logic while we're at it.

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