[Bug 733921] basesrc: re-negotiate caps in pull mode if necessary

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733921
  GStreamer | gstreamer (core) | git master

--- Comment #3 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2015-02-03 12:15:11 UTC ---
I don't think basesrc should do anything negotiation/allocator related in this
case.

Whoever pulls data can pass a buffer to be filled in with data to the source
element, so is free to negotiate or use allocators of its choice, allocate a
suitably-sized buffer and then pass it to the source to fill with data.

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