mirror of https://git.ffmpeg.org/ffmpeg.git
return optimal fraction
based on a patch by Uoti Urpala Originally committed as revision 7186 to svn://svn.ffmpeg.org/ffmpeg/trunk
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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)
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int64_t a2n= x*a1.num + a0.num;
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int64_t a2d= x*a1.den + a0.den;
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if(a2n > max || a2d > max) break;
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if(a2n > max || a2d > max){
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if(a1.num) x= (max - a0.num) / a1.num;
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if(a1.den) x= FFMIN(x, (max - a0.den) / a1.den);
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// Won't overflow, sum == original denominator
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if (den*(2*x*a1.den + a0.den) > nom*a1.den)
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a1 = (AVRational){x*a1.num + a0.num, x*a1.den + a0.den};
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break;
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}
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a0= a1;
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a1= (AVRational){a2n, a2d};
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