[Bug 656392] New: audioresample: add FFT based checks

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=656392
  GStreamer | gst-plugins-base | unspecified

           Summary: audioresample: add FFT based checks
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vincent.penquerch at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


As requested earlier.
The checks are pretty basic, but comparing FFTs of different sizes
proved difficult (I tried doing some linear filtering to bring FFTs
to the same size, but the value changes are so sudden I'd need to
smooth a lot to avoid false negatives, which would make the test
be very prone to false positives. There may be techniques for doing
this kind of thing, but I'm FFT ignorant so comments welcome).

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