[Bug 664720] New: API: add gst_buffer_{set,get}_qdata()

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=664720
  GStreamer | gstreamer (core) | git

           Summary: API: add gst_buffer_{set,get}_qdata()
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: t.i.m at zen.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=202055)
 View: https://bugzilla.gnome.org/attachment.cgi?id=202055
 Review: https://bugzilla.gnome.org/review?bug=664720&attachment=202055

buffer: add gst_buffer_{set,get}_qdata()

Allows people/us to attach arbitrary metadata to buffers without creating a
subclass, which is handy for all kinds of things.

This is on GstBuffer and not GstMiniObject because it only really makes sense
with buffers, and because all the conceptual bits of metadata writability and
metadata copying are part of GstBuffer.

The cost of this should be negligible when not used (just extends the malloc
sizeof the buffer object by sizeof(gpointer)). I opted for a private struct
instead of just using the reserved field directly so we still have one public
pointer left for public things.

(gtk-doc Since: markers will be fixed up before commit, obviously)

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