[Bug 733921] New: 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

           Summary: basesrc: re-negotiate caps in pull mode if necessary
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: matthieu.bouron at collabora.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


This patch solves the case when basesrc is stuck in pull mode and never get the
chance to negotiate with downstream (to use a custom memory allocator for
example).
It happens when typefind is plugged downstream, with the following scenario:

filesrc ! typefind ! demuxer (proposing a custom memory allocator).

Not sure if the patch is 100% correct though.

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