[Bug 736797] audio: correct condition for MPEG case.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736797
  GStreamer | gst-plugins-base | 1.x

--- Comment #7 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-09-24 13:34:13 UTC ---
Note that this is iec61937, so looking at the information for MP1/2/3 does not
necessarily help. Also 2304 never appeared anywhere on that website and I also
never saw it used in combination with MP1/2/3.

So we need to check where this number comes from in iec61937

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