[Bug 666887] [0.11]gstinterpolationcontrolsource uses FP_NAN

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=666887
  GStreamer | gstreamer (core) | 0.11.x

--- Comment #5 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2011-12-29 10:46:44 UTC ---
Yep, its a good fit for ./gst/math-compat.h. I have found a coupld of isnan
calls in gst-ffmpeg, but nowhere else so far. For linux I found a define for
NAN in bits/nan.h (included from math.h). It is essentially:


# if __BYTE_ORDER == __BIG_ENDIAN
#  define __nan_bytes        { 0x7f, 0xc0, 0, 0 }
# endif
# if __BYTE_ORDER == __LITTLE_ENDIAN
#  define __nan_bytes        { 0, 0, 0xc0, 0x7f }
# endif

static union { unsigned char __c[4]; float __d; } __nan_union
    __attribute_used__ = { __nan_bytes };
# define NAN    (__nan_union.__d)

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