[Bug 764361] New: Proposed change: Let gdpdepay query for buffer allocator

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764361

            Bug ID: 764361
           Summary: Proposed change: Let gdpdepay query for buffer
                    allocator
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: christsn.gs at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 325004
  --> https://bugzilla.gnome.org/attachment.cgi?id=325004&action=edit
Patch where gdpdepay query for buffer allocator before using default

If an other element downstreams has it own allocator, the buffer created with
gst_dp_buffer_from_header appears to be allocated twice. One time using the
default allocator in gdpdepay, and one in the downstream element with its
allocator. 

Perhaps this is the intended behavior, but if not, would like to propose a
change to the gdpdepay element where it tries to query for an potential
allocator different from the default, and use that one if it exists. Otherwise
use the default allocator.

Attached a patch with a suggestion on how this can be done, but don't know if
that is the correct way of doing it.

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