[Bug 707793] dmabuf allocator shouldn't a singleton

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=707793
  GStreamer | gst-plugins-base | git

--- Comment #11 from Michael Olbrich <m.olbrich at pengutronix.de> 2013-09-12 08:11:22 UTC ---
I agree that making it not a singleton is a step in the right direction.

About the mmap problem: I don't know what you mean about the binding
assumptions, but how about this:

Only do the ifdef in gst_dmabuf_mem_{map,unmap}(). In theory a dmabuf memory
could be useful without mapping it. Both producer and consumer could work only
with the fd.
Such a scenario is probably rather unlikly but this would also minimize the
ifdef.

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