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return optimal fraction 

based on a patch by Uoti Urpala

Originally committed as revision 7186 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-11-30 01:18:57 +00:00
parent 8fa641f8e8
commit 3db1b8b538
1 changed files with 9 additions and 1 deletions
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10
libavutil/rational.c
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@ -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};