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aspect ratio cleanup

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Originally committed as revision 1254 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-11-20 13:08:04 +00:00
parent 67d06418da
commit 5d3cea3a86
6 changed files with 76 additions and 33 deletions
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26
libavcodec/common.c
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@ -326,3 +326,29 @@ int ff_gcd(int a, int b){
if(b) return ff_gcd(b, a%b);
else return a;
}
void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max){
double best_diff=1E10, diff;
int best_denom=1, best_nom=1;
int nom, denom, gcd;
//brute force here, perhaps we should try continued fractions if we need large max ...
for(denom=1; denom<=max; denom++){
nom= (int)(f*denom + 0.5);
if(nom<=0 || nom>max) continue;
diff= ABS( f - (double)nom / (double)denom );
if(diff < best_diff){
best_diff= diff;
best_nom= nom;
best_denom= denom;
}
}
gcd= ff_gcd(best_nom, best_denom);
best_nom /= gcd;
best_denom /= gcd;
*nom_arg= best_nom;
*denom_arg= best_denom;
}