[Bug 699181] New: Videoscale scaling routines ought to be exposed in libs

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=699181
  GStreamer | gst-plugins-base | git

           Summary: Videoscale scaling routines ought to be exposed in
                    libs
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: douglas at halo.gen.nz
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


There are times when a videofilter developer wants to work with a temporary
downscaled copy of a frame or a scale pyramid.

While image scaling is not complicated in theory, it is one of those things
that is fiddly in practice.  Ad-hoc implementations are unlikely to be
simultaneously fast and correct.  One solution would be to borrow an
implementation from somewhere, but that involves tedious searching and
integration.  Borrowing the videoscale code at source level looks simple (the
scaling parts seem to be fairly well separated from the Element parts) but
require use of the orc compiler which is something of an adoption barrier.

So I think it would be a good idea to expose the core image scaling functions
as a plugins-base library, along the lines of the FFT library.

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