147 lines
3.4 KiB
C++
147 lines
3.4 KiB
C++
//Copyright 2015 Adam Quintero
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//This program is distributed under the terms of the GNU General Public License.
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// Adapted by MattKC for the Olive Video Editor (2019)
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#ifndef RATIONAL_H
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#define RATIONAL_H
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#include <iostream>
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#ifdef USE_OTIO
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#include <opentime/rationalTime.h>
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#endif
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#include <QDebug>
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#include <QMetaType>
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extern "C" {
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#include <libavformat/avformat.h>
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}
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#include "common/define.h"
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namespace olive {
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typedef int64_t intType;
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/*
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* Zero Handling
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* 0/0 = 0
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* 0/non-zero = 0
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* non-zero/0 = 0
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*/
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class rational
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{
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public:
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//constructors
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rational(const intType &numerator = 0) :
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numer_(numerator),
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denom_(1)
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{
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}
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rational(const intType &numerator, const intType &denominator) :
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numer_(numerator),
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denom_(denominator)
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{
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fix_signs();
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reduce();
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}
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rational(const rational &rhs) = default;
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rational(const AVRational& r) :
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numer_(r.num),
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denom_(r.den)
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{
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fix_signs();
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reduce();
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}
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static rational fromDouble(const double& flt, bool *ok = nullptr);
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static rational fromString(const QString& str, bool* ok = nullptr);
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static const rational NaN;
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//Assignment Operators
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const rational& operator=(const rational &rhs);
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const rational& operator+=(const rational &rhs);
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const rational& operator-=(const rational &rhs);
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const rational& operator/=(const rational &rhs);
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const rational& operator*=(const rational &rhs);
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//Binary math operators
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rational operator+(const rational &rhs) const;
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rational operator-(const rational &rhs) const;
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rational operator/(const rational &rhs) const;
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rational operator*(const rational &rhs) const;
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//Relational and equality operators
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bool operator<(const rational &rhs) const;
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bool operator<=(const rational &rhs) const;
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bool operator>(const rational &rhs) const;
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bool operator>=(const rational &rhs) const;
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bool operator==(const rational &rhs) const;
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bool operator!=(const rational &rhs) const;
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//Unary operators
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const rational& operator+() const;
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rational operator-() const;
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bool operator!() const;
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//Function: convert to double
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double toDouble() const;
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AVRational toAVRational() const;
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#ifdef USE_OTIO
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// Convert Olive ratioanls to opentime rationals with the given framerate (defaults to 24)
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opentime::RationalTime toRationalTime(double framerate = 24) const;
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#endif
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// Produce "flipped" version
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rational flipped() const;
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void flip();
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// Returns whether the rational is valid but equal to zero or not
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//
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// A NaN is always a null, but a null is not always a NaN
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bool isNull() const;
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// Returns whether this rational is not a valid number
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bool isNaN() const;
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//IO
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friend std::ostream& operator<<(std::ostream &out, const rational &value);
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friend std::istream& operator>>(std::istream &in, rational &value);
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const intType& numerator() const;
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const intType& denominator() const;
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QString toString() const;
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private:
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//numerator and denominator
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intType numer_;
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intType denom_;
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//Function: ensures denom >= 0
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void fix_signs();
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//Function: ensures lowest form
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void reduce();
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//Function: finds greatest common denominator
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static intType gcd(const intType &x, const intType &y);
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};
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#define RATIONAL_MIN rational(INT64_MIN, 1)
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#define RATIONAL_MAX rational(INT64_MAX, 1)
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uint qHash(const rational& r, uint seed = 0);
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}
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QDebug operator<<(QDebug debug, const olive::rational& r);
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Q_DECLARE_METATYPE(olive::rational)
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#endif // RATIONAL_H
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