ffmpeg | branch: master | Ganesh Ajjanagadde <[email protected]> | Thu Oct 29 00:18:15 2015 -0400| [8d9f86bd3791d4448460faee03f07751d0202c32] | committer: Ganesh Ajjanagadde
avutil/rational: use frexp rather than ad-hoc log to get floating point exponent This simplifies and cleans up the code. Furthermore, it is much faster due to absence of the slow log computation. Reviewed-by: Michael Niedermayer <[email protected]> Signed-off-by: Ganesh Ajjanagadde <[email protected]> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8d9f86bd3791d4448460faee03f07751d0202c32 --- libavutil/rational.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavutil/rational.c b/libavutil/rational.c index 21d2bb7..81a9402 100644 --- a/libavutil/rational.c +++ b/libavutil/rational.c @@ -106,14 +106,14 @@ AVRational av_sub_q(AVRational b, AVRational c) AVRational av_d2q(double d, int max) { AVRational a; -#define LOG2 0.69314718055994530941723212145817656807550013436025 int exponent; int64_t den; if (isnan(d)) return (AVRational) { 0,0 }; if (fabs(d) > INT_MAX + 3LL) return (AVRational) { d < 0 ? -1 : 1, 0 }; - exponent = FFMAX( (int)(log(fabs(d) + 1e-20)/LOG2), 0); + frexp(d, &exponent); + exponent = FFMAX(exponent-1, 0); den = 1LL << (61 - exponent); // (int64_t)rint() and llrint() do not work with gcc on ia64 and sparc64 av_reduce(&a.num, &a.den, floor(d * den + 0.5), den, max); _______________________________________________ ffmpeg-cvslog mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
