101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifndef RATIONAL_H
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#define RATIONAL_H
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// Adapted from https://github.com/angularadam/Qt-Class-rational used in compliance with the GNU General Public License
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#include <iostream>
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/**
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* Including AVFormat to support converting from AVRational to Olive's rational class
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*/
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extern "C" {
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#include <libavformat/avformat.h>
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}
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/**
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* @brief A rational (numerator/denominator) class with C++ operations built in for ease of use.
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*
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* Rationals in Olive most frequently represent timing information to easily handle timing in various different
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* frame/sample rates without the inaccuracy/rounding errors of a floating point type.
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*/
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class rational {
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public:
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// Constructors
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rational(const int64_t& numerator = 0);
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rational(const int64_t& numerator, const int64_t& denominator);
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rational(const AVRational& r); // Auto-convert from an FFmpeg AVRational
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rational(const rational& r);
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// Assignment Operators
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const rational& operator=(const rational& r);
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const rational& operator+=(const rational& r);
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const rational& operator-=(const rational& r);
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const rational& operator/=(const rational& r);
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const rational& operator*=(const rational& r);
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// Math Operators
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rational operator+(const rational& r) const;
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rational operator-(const rational& r) const;
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rational operator/(const rational& r) const;
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rational operator*(const rational& r) const;
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// Relational and Equality Operators
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bool operator<(const rational &r) const;
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bool operator<=(const rational &r) const;
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bool operator>(const rational &r) const;
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bool operator>=(const rational &r) const;
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bool operator==(const rational &r) const;
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bool operator!=(const rational &r) const;
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//Unary operators
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const rational& operator++(); //prefix
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rational operator++(int); //postfix
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const rational& operator--(); //prefix
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rational operator--(int); //postfix
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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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// 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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// Convert to double
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double ToDouble() const;
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// Specific values
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const int64_t& numerator() const;
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const int64_t& denominator() const;
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rational flipped() const;
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private:
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int64_t numerator_;
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int64_t denominator_;
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void FixSigns();
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void Reduce();
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int64_t GreatestCommonDenominator(const int64_t &x, const int64_t &y);
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};
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#endif // RATIONAL_H
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