[Bug 649542] New: element ranking customization

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=649542
  GStreamer | gstreamer (core) | 0.10.32

           Summary: element ranking customization
    Classification: Platform
           Product: GStreamer
           Version: 0.10.32
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: benjamin.gaignard at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=187346)
 View: https://bugzilla.gnome.org/attachment.cgi?id=187346
 Review: https://bugzilla.gnome.org/review?bug=649542&attachment=187346

draft of implementation

The idea is to offer a way to customize element ranking without hacking/patch
code. 
I need that feature because some decoders (like h264) may request to autoplug a
parser between them and the demuxer. Today ins't possible without hack parser
code.

This could be done by modify the element rank before write it into cache
registry.
Modifications are store in a file (in a humain readable format) and I add a gst
tool, named gst-rank, to edit this file.

All comments/review/help is welcome

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