From 3db1b8b5386d7d9c79008df4a64c4d871f575c3c Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 30 Nov 2006 01:18:57 +0000 Subject: [PATCH] return optimal fraction based on a patch by Uoti Urpala Originally committed as revision 7186 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavutil/rational.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/libavutil/rational.c b/libavutil/rational.c index 4f343f7e32..9fcf621f0b 100644 --- a/libavutil/rational.c +++ b/libavutil/rational.c @@ -51,7 +51,15 @@ int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max) int64_t a2n= x*a1.num + a0.num; int64_t a2d= x*a1.den + a0.den; - if(a2n > max || a2d > max) break; + if(a2n > max || a2d > max){ + if(a1.num) x= (max - a0.num) / a1.num; + if(a1.den) x= FFMIN(x, (max - a0.den) / a1.den); + + // Won't overflow, sum == original denominator + if (den*(2*x*a1.den + a0.den) > nom*a1.den) + a1 = (AVRational){x*a1.num + a0.num, x*a1.den + a0.den}; + break; + } a0= a1; a1= (AVRational){a2n, a2d};