From c5b6afab8b74e5cc938b8467d3808a877ded7d03 Mon Sep 17 00:00:00 2001 From: Mike Melanson Date: Mon, 27 Oct 2003 15:24:38 +0000 Subject: super mega ffmpeg tree sync CVS patchset: 5615 CVS date: 2003/10/27 15:24:38 --- src/libffmpeg/libavcodec/rational.c | 61 +++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 src/libffmpeg/libavcodec/rational.c (limited to 'src/libffmpeg/libavcodec/rational.c') diff --git a/src/libffmpeg/libavcodec/rational.c b/src/libffmpeg/libavcodec/rational.c new file mode 100644 index 000000000..92db8bbe3 --- /dev/null +++ b/src/libffmpeg/libavcodec/rational.c @@ -0,0 +1,61 @@ +/* + * Rational numbers + * Copyright (c) 2003 Michael Niedermayer + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/** + * @file rational.c + * Rational numbers + * @author Michael Niedermayer + */ + +//#include +#include + +#include "common.h" +#include "avcodec.h" +#include "rational.h" + +AVRational av_mul_q(AVRational b, AVRational c){ + av_reduce(&b.num, &b.den, b.num * (int64_t)c.num, b.den * (int64_t)c.den, INT_MAX); + return b; +} + +AVRational av_div_q(AVRational b, AVRational c){ + av_reduce(&b.num, &b.den, b.num * (int64_t)c.den, b.den * (int64_t)c.num, INT_MAX); + return b; +} + +AVRational av_add_q(AVRational b, AVRational c){ + 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); + return b; +} + +AVRational av_sub_q(AVRational b, AVRational c){ + 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); + return b; +} + +AVRational av_d2q(double d, int max){ + AVRational a; + int exponent= FFMAX( (int)(log(ABS(d) + 1e-20)/log(2)), 0); + int64_t den= 1LL << (61 - exponent); + av_reduce(&a.num, &a.den, (int64_t)(d * den + 0.5), den, max); + + return a; +} -- cgit v1.2.3