[Bug 760270] videoparse: add support of padded video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760270

--- Comment #12 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
Created attachment 318879
  --> https://bugzilla.gnome.org/attachment.cgi?id=318879&action=edit
[5/6] rawparse: add 'decide_allocation' vfunc to let subclass parse an
allocation query

This patch send an allocation query to downstream element and add a simple
vfunc to let 'subclass' check result of it. It will be used to check if
downstream supports various meta so base class doesn't handle any buffer pool
or allocation parameters.

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