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authorGanesh Ajjanagadde <gajjanagadde@gmail.com>2015-11-14 11:57:28 -0500
committerGanesh Ajjanagadde <gajjanagadde@gmail.com>2015-11-21 08:51:49 -0500
commit275aca8fba50e77af16627d8d5db4b3d4987d889 (patch)
tree7b0d88db7fb09ddbe2235c5caf43a5832d580fe1 /libavcodec/dv_profile.c
parent14ea4151d7c3c26500193f11ac661ed20c7c2b9c (diff)
downloadffmpeg-275aca8fba50e77af16627d8d5db4b3d4987d889.tar.gz
configure+libm.h: add hypot emulation
It is known that the naive sqrt(x*x + y*y) approach for computing the hypotenuse suffers from overflow and accuracy issues, see e.g http://www.johndcook.com/blog/2010/06/02/whats-so-hard-about-finding-a-hypotenuse/. This adds hypot support to FFmpeg, a C99 function. On platforms without hypot, this patch does a reaonable workaround, that although not as accurate as GNU libm, is readable and does not suffer from the overflow issue. Improvements can be made separately. Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Diffstat (limited to 'libavcodec/dv_profile.c')
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