And change lengths and indices from guint to gsize for a more correct type. Also deprecate GstQueueArray and implement it in terms of GstVecDeque. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6779>
Base classes ------------ GstBaseSink FIXME: not much point making it operate in pull mode as a generic base class I guess...