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rational.go
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rational.go
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package avgo
//#cgo pkg-config: libavutil
//#include <libavutil/rational.h>
import "C"
import (
"strconv"
"unsafe"
)
// https://github.com/FFmpeg/FFmpeg/blob/n4.4/libavutil/rational.h#L58
type Rational struct {
c C.struct_AVRational
}
func newRationalFromC(c C.struct_AVRational) Rational {
return Rational{c: c}
}
func NewRational(num, den int) Rational {
var r Rational
r.SetNum(num)
r.SetDen(den)
return r
}
func (r Rational) Num() int {
return int(r.c.num)
}
func (r *Rational) SetNum(num int) {
r.c.num = C.int(num)
}
func (r Rational) Den() int {
return int(r.c.den)
}
func (r *Rational) SetDen(den int) {
r.c.den = C.int(den)
}
func (r Rational) ToDouble() float64 {
if r.Num() == 0 || r.Den() == 0 {
return 0
}
return float64(r.Num()) / float64(r.Den())
}
// func (r Rational) RescaleQ(a int64, r2 Rational) int {
// return int(C.av_rescale_q(C.int64_t(a), r.c, r2.c))
// }
func (r Rational) Compare(r2 Rational) int {
return int(C.av_cmp_q(r.c, r2.c))
}
func (r Rational) Multiply(r2 Rational) Rational {
return newRationalFromC(C.av_mul_q(r.c, r2.c))
}
func (r Rational) Div(r2 Rational) Rational {
return newRationalFromC(C.av_div_q(r.c, r2.c))
}
func (r Rational) Add(r2 Rational) Rational {
return newRationalFromC(C.av_add_q(r.c, r2.c))
}
func (r Rational) Subtract(r2 Rational) Rational {
return newRationalFromC(C.av_sub_q(r.c, r2.c))
}
func (r Rational) Invert() Rational {
return newRationalFromC(C.av_inv_q(r.c))
}
func (r Rational) Nearer(q1, q2 Rational) int {
return int(C.av_nearer_q(r.c, q1.c, q2.c))
}
func (r Rational) NearestIndex(q []Rational) int {
return int(C.av_find_nearest_q_idx(r.c, (*C.struct_AVRational)(unsafe.Pointer(&q[0]))))
}
func (r Rational) String() string {
if r.Num() == 0 || r.Den() == 0 {
return "0"
}
return strconv.Itoa(r.Num()) + "/" + strconv.Itoa(r.Den())
}