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97115451d0
av_gcd_q64 was declared in rational64.h but never defined or used. Signed-off-by: Zhao Zhili <quinkblack@foxmail.com>
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
/*
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* 64-bit rational numbers
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* Copyright (c) 2025 Niklas Haas
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @ingroup lavu_math_rational
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* 64-bit extension of AVRational.
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* @author Niklas Haas
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*/
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#ifndef SWSCALE_RATIONAL64_H
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#define SWSCALE_RATIONAL64_H
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#include <stdint.h>
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#include <limits.h>
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#include "libavutil/attributes.h"
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/**
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* @defgroup AVRational64
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* 64-bit extension of AVRational
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*
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* Offers a 64-bit extended version of AVRational. This is less efficient (and
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* may revolve around emulated 128-bit multiplications internally), but allows
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* to represent a much larger range of rational numbers without overflow.
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*
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* @{
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*/
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/**
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* 64-bit Rational number (pair of numerator and denominator).
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*/
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typedef struct AVRational64 {
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int64_t num; ///< Numerator
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int64_t den; ///< Denominator
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} AVRational64;
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/**
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* Create an AVRational64.
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*
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* Useful for compilers that do not support compound literals.
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*
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* @note The return value is not reduced.
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*/
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static inline AVRational64 av_make_q64(int64_t num, int64_t den)
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{
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AVRational64 r = { num, den };
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return r;
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}
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/**
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* Compare two 64-bit rationals.
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*
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* @param a First rational
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* @param b Second rational
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*
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* @return One of the following values:
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* - 0 if `a == b`
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* - 1 if `a > b`
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* - -1 if `a < b`
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* - `INT_MIN` if one of the values is of the form `0 / 0`
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*/
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int av_cmp_q64(AVRational64 a, AVRational64 b);
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/**
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* Convert an AVRational64 to a `double`.
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* @param a AVRational64 to convert
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* @return `a` in floating-point form
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* @see av_d2q()
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*/
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static inline double av_q2d_64(AVRational64 a){
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return a.num / (double) a.den;
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}
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/**
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* Multiply two 64-bit rationals.
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* @param b First multiplicant
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* @param c Second multiplicant
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* @return b*c
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*/
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AVRational64 av_mul_q64(AVRational64 b, AVRational64 c) av_const;
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/**
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* Divide one 64-bit rational by another.
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* @param b Dividend
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* @param c Divisor
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* @return b/c
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*/
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AVRational64 av_div_q64(AVRational64 b, AVRational64 c) av_const;
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/**
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* Add two 64-bit rationals.
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* @param b First addend
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* @param c Second addend
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* @return b+c
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*/
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AVRational64 av_add_q64(AVRational64 b, AVRational64 c) av_const;
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/**
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* Subtract one 64-bit rational from another.
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* @param b Minuend
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* @param c Subtrahend
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* @return b-c
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*/
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AVRational64 av_sub_q64(AVRational64 b, AVRational64 c) av_const;
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/**
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* Invert a 64-bit rational.
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* @param q value
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* @return 1 / q
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*/
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static av_always_inline AVRational64 av_inv_q64(AVRational64 q)
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{
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AVRational64 r = { q.den, q.num };
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return r;
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}
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/**
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* @}
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*/
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#endif /* SWSCALE_RATIONAL64_H */
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