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lavu/libm: add copysign hack 

For systems with broken libms.
Tested with NAN, -NAN, INFINITY, -INFINITY, +/-x for regular double x and
combinations of these.

Old versions of MSVC need some UINT64_C hackery.

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Reviewed-by: Hendrik Leppkes <h.leppkes@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-12-18 11:13:11 -08:00
parent 0f520e489a
commit 062e3e2382
2 changed files with 10 additions and 1 deletions
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2
configure vendored
View File

@ -2851,7 +2851,7 @@ cropdetect_filter_deps="gpl"
delogo_filter_deps="gpl"
deshake_filter_select="pixelutils"
drawtext_filter_deps="libfreetype"
dynaudnorm_filter_deps="copysign erf"
dynaudnorm_filter_deps="erf"
ebur128_filter_deps="gpl"
eq_filter_deps="gpl"
fftfilt_filter_deps="avcodec"

9
libavutil/libm.h
View File

@ -62,6 +62,15 @@ static av_always_inline float cbrtf(float x)
}
#endif
#if !HAVE_COPYSIGN
static av_always_inline double copysign(double x, double y)
{
uint64_t vx = av_double2int(x);
uint64_t vy = av_double2int(y);
return av_int2double((vx & UINT64_C(0x7fffffffffffffff)) | (vy & UINT64_C(0x8000000000000000)));
}
#endif
#if !HAVE_COSF
#undef cosf
#define cosf(x) ((float)cos(x))