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Code Issues Releases Activity

cosmetics: Use 'num' instead of 'nom' as abbreviation for numerator.

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Originally committed as revision 16910 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Diego Biurrun 2009-02-01 00:20:45 +00:00
parent 7591b30499
commit 674bd4f691
2 changed files with 15 additions and 15 deletions
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22
libavutil/rational.c
View File

@ -33,23 +33,23 @@
#include "mathematics.h"
#include "rational.h"
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max){
AVRational a0={0,1}, a1={1,0};
int sign= (nom<0) ^ (den<0);
int64_t gcd= av_gcd(FFABS(nom), FFABS(den));
int sign= (num<0) ^ (den<0);
int64_t gcd= av_gcd(FFABS(num), FFABS(den));
if(gcd){
nom = FFABS(nom)/gcd;
num = FFABS(num)/gcd;
den = FFABS(den)/gcd;
}
if(nom<=max && den<=max){
a1= (AVRational){nom, den};
if(num<=max && den<=max){
a1= (AVRational){num, den};
den=0;
}
while(den){
uint64_t x = nom / den;
int64_t next_den= nom - den*x;
uint64_t x = num / den;
int64_t next_den= num - den*x;
int64_t a2n= x*a1.num + a0.num;
int64_t a2d= x*a1.den + a0.den;
@ -57,19 +57,19 @@ int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max)
if(a1.num) x= (max - a0.num) / a1.num;
if(a1.den) x= FFMIN(x, (max - a0.den) / a1.den);
if (den*(2*x*a1.den + a0.den) > nom*a1.den)
if (den*(2*x*a1.den + a0.den) > num*a1.den)
a1 = (AVRational){x*a1.num + a0.num, x*a1.den + a0.den};
break;
}
a0= a1;
a1= (AVRational){a2n, a2d};
nom= den;
num= den;
den= next_den;
}
assert(av_gcd(a1.num, a1.den) <= 1U);
*dst_nom = sign ? -a1.num : a1.num;
*dst_num = sign ? -a1.num : a1.num;
*dst_den = a1.den;
return den==0;

8
libavutil/rational.h
View File

@ -64,14 +64,14 @@ static inline double av_q2d(AVRational a){
/**
* Reduces a fraction.
* This is useful for framerate calculations.
* @param dst_nom destination numerator
* @param dst_num destination numerator
* @param dst_den destination denominator
* @param nom source numerator
* @param num source numerator
* @param den source denominator
* @param max the maximum allowed for dst_nom & dst_den
* @param max the maximum allowed for dst_num & dst_den
* @return 1 if exact, 0 otherwise
*/
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max);
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max);
/**
* Multiplies two rationals.