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move doxy comments from rational.c to rational.h and add some new comments
patch by Dujardin Bernard %dujardin P iut A numericable P fr% Originally committed as revision 8132 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -75,40 +75,24 @@ int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max)
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return den==0;
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}
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/**
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* returns b*c.
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*/
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AVRational av_mul_q(AVRational b, AVRational c){
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av_reduce(&b.num, &b.den, b.num * (int64_t)c.num, b.den * (int64_t)c.den, INT_MAX);
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return b;
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}
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/**
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* returns b/c.
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*/
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AVRational av_div_q(AVRational b, AVRational c){
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return av_mul_q(b, (AVRational){c.den, c.num});
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}
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/**
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* returns b+c.
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*/
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AVRational av_add_q(AVRational b, AVRational c){
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av_reduce(&b.num, &b.den, b.num * (int64_t)c.den + c.num * (int64_t)b.den, b.den * (int64_t)c.den, INT_MAX);
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return b;
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}
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/**
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* returns b-c.
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*/
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AVRational av_sub_q(AVRational b, AVRational c){
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return av_add_q(b, (AVRational){-c.num, c.den});
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}
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/**
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* Converts a double precission floating point number to a AVRational.
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* @param max the maximum allowed numerator and denominator
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*/
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AVRational av_d2q(double d, int max){
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AVRational a;
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#define LOG2 0.69314718055994530941723212145817656807550013436025
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@ -51,7 +51,7 @@ static inline int av_cmp_q(AVRational a, AVRational b){
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}
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/**
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* Rational to double conversion
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* Rational to double conversion.
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* @param a rational to convert
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* @return (double) a
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*/
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@ -71,10 +71,44 @@ static inline double av_q2d(AVRational a){
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*/
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int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max);
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/**
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* Multiplies two rationals.
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* @param b first rational.
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* @param c second rational.
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* @return b*c.
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*/
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AVRational av_mul_q(AVRational b, AVRational c);
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/**
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* Divides two rationals.
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* @param b first rational.
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* @param c second rational.
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* @return b/c.
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*/
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AVRational av_div_q(AVRational b, AVRational c);
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/**
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* Adds two rationals.
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* @param b first rational.
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* @param c second rational.
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* @return b+c.
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*/
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AVRational av_add_q(AVRational b, AVRational c);
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/**
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* Substracts two rationals.
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* @param b first rational.
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* @param c second rational.
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* returns b-c.
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*/
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AVRational av_sub_q(AVRational b, AVRational c);
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/**
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* Converts a double precision floating point number to a rational.
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* @param d double to convert
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* @param max the maximum allowed numerator and denominator
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* @return (AVRational) d.
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*/
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AVRational av_d2q(double d, int max);
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#endif // RATIONAL_H
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