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author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-11-14 11:57:28 -0500 |
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committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-11-21 08:51:49 -0500 |
commit | 275aca8fba50e77af16627d8d5db4b3d4987d889 (patch) | |
tree | 7b0d88db7fb09ddbe2235c5caf43a5832d580fe1 /libavcodec/vp6data.h | |
parent | 14ea4151d7c3c26500193f11ac661ed20c7c2b9c (diff) | |
download | ffmpeg-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/vp6data.h')
0 files changed, 0 insertions, 0 deletions