[Bug 720568] New: v4l2: Various changes to allow using M2M decoders

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720568
  GStreamer | gst-plugins-good | git

           Summary: v4l2: Various changes to allow using M2M decoders
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


In order to introduce support for M2M decoders, I endup having to rework a lot
of code in the v4l2 code base. As this patchset is growing, I decided to bring
a first lot of patches to review. These patches includes some refactoring, new
helpers functions and cleanup. There is also important change in the buffer
pool to allow better handling of negotiation. This code is tested on top of a
working, but yet incomplete decoder, but I'd like to start the review process
as soon as possible.

(Patches will follow)

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