All these should return GstFlowReturn, not gboolean
If the pad was still owning a buffer when being destroyed it was leaked. Fix a leak with the test_flush_start_flush_stop test. https://bugzilla.gnome.org/show_bug.cgi?id=766663
It's useful enough already to be used in other elements for audio aggregation, let's give people the opportunity to use it and give it some API testing. https://bugzilla.gnome.org/show_bug.cgi?id=760733
