[Bug 774944] New: iqa makes it difficult to support multiple metrics

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774944

            Bug ID: 774944
           Summary: iqa makes it difficult to support multiple metrics
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lrn1986 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This was discussed on the IRC, the gist is that iqa hardcodes all input to be
converted to RGB for dssim, and not all metrics can be computed on RGB.
One possible fix is to make existing Iqa class a dssim-only class (renaming it
to IqaDssim), and implement other metrics as separate IqaSomething classes. Not
a lot of code duplication, since GstVideoAggregator does most of the plumbing
anyway.

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