[Bug 755301] audioconvert: Integer->Float conversion creates values slightly smaller than -1.0

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755301

--- Comment #13 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Sebastian Dröge (slomo) from comment #12)
> Created attachment 311849 [details] [review]
> audioconvert: Divide by 2147483648 when converting to floats to stay in
> [-1.0, 1.0] range
> 
> Breaks unit tests, don't merge yet.

Now the problem here is that 2147483648.0 and 2147483647.0 are the same value
for 32 bit floats. Printing that value even gives us 2147483648.0, and we were
using that one before.

For doubles the above patch should make a difference (and it does, the unit
test becomes unhappy).

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