1/* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19/** 20 * @file 21 * Replacements for frequently missing libm functions 22 */ 23 24#ifndef AVUTIL_LIBM_H 25#define AVUTIL_LIBM_H 26 27#include <math.h> 28#include "config.h" 29#include "attributes.h" 30 31#if !HAVE_EXP2 32#undef exp2 33#define exp2(x) exp((x) * 0.693147180559945) 34#endif /* HAVE_EXP2 */ 35 36#if !HAVE_EXP2F 37#undef exp2f 38#define exp2f(x) ((float)exp2(x)) 39#endif /* HAVE_EXP2F */ 40 41#if !HAVE_LLRINT 42#undef llrint 43#define llrint(x) ((long long)rint(x)) 44#endif /* HAVE_LLRINT */ 45 46#if !HAVE_LLRINTF 47#undef llrintf 48#define llrintf(x) ((long long)rint(x)) 49#endif /* HAVE_LLRINT */ 50 51#if !HAVE_LOG2 52#undef log2 53#define log2(x) (log(x) * 1.44269504088896340736) 54#endif /* HAVE_LOG2 */ 55 56#if !HAVE_LOG2F 57#undef log2f 58#define log2f(x) ((float)log2(x)) 59#endif /* HAVE_LOG2F */ 60 61#if !HAVE_LRINT 62static av_always_inline av_const long int lrint(double x) 63{ 64 return rint(x); 65} 66#endif /* HAVE_LRINT */ 67 68#if !HAVE_LRINTF 69static av_always_inline av_const long int lrintf(float x) 70{ 71 return (int)(rint(x)); 72} 73#endif /* HAVE_LRINTF */ 74 75#if !HAVE_ROUND 76static av_always_inline av_const double round(double x) 77{ 78 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5); 79} 80#endif /* HAVE_ROUND */ 81 82#if !HAVE_ROUNDF 83static av_always_inline av_const float roundf(float x) 84{ 85 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5); 86} 87#endif /* HAVE_ROUNDF */ 88 89#if !HAVE_TRUNCF 90static av_always_inline av_const float truncf(float x) 91{ 92 return (x > 0) ? floor(x) : ceil(x); 93} 94#endif /* HAVE_TRUNCF */ 95 96#endif /* AVUTIL_LIBM_H */ 97