[Bug 745730] gl: Putting GstGLAllocator as first allocator in ALLOCATION query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745730

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Situation here is the following:
- glvideomixer configures its pool, min-buffers=0
- videotestsrc gets this pool and a corresponding allocator from the allocation
query
- videotestsrc tries to change the pool config (and deactivates the pool used
by glvideomixer!), setting min-buffers=1. That fails because there is still one
outstanding buffer
- basesrc falls back to create a GstBufferPool and tries to use the
GstGLAllocator on that
- fails to allocate buffers when starting the new pool


It also seems dangerous that glvideomixer provides its own pool to upstream.
Its own pool can already be configured, and upstream might want to configure it
differently. Especially all upstreams might want to configure it differently!

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