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ffmpeg / libavutil / libm.h @ d112aa5a

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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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 * Replacements for frequently missing libm functions
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 */
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#ifndef AVUTIL_LIBM_H
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#define AVUTIL_LIBM_H
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#include <math.h>
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#include "config.h"
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#include "attributes.h"
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#if !HAVE_EXP2
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#undef exp2
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#define exp2(x) exp((x) * 0.693147180559945)
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#endif /* HAVE_EXP2 */
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#if !HAVE_EXP2F
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#undef exp2f
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#define exp2f(x) ((float)exp2(x))
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#endif /* HAVE_EXP2F */
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#if !HAVE_LLRINT
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#undef llrint
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#define llrint(x) ((long long)rint(x))
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#endif /* HAVE_LLRINT */
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#if !HAVE_LLRINTF
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#undef llrintf
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#define llrintf(x) ((long long)rint(x))
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#endif /* HAVE_LLRINT */
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#if !HAVE_LOG2
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#undef log2
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#define log2(x) (log(x) * 1.44269504088896340736)
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#endif /* HAVE_LOG2 */
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#if !HAVE_LOG2F
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#undef log2f
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#define log2f(x) ((float)log2(x))
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#endif /* HAVE_LOG2F */
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#if !HAVE_LRINT
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static av_always_inline av_const long int lrint(double x)
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{
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    return rint(x);
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}
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#endif /* HAVE_LRINT */
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#if !HAVE_LRINTF
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static av_always_inline av_const long int lrintf(float x)
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{
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    return (int)(rint(x));
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}
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#endif /* HAVE_LRINTF */
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#if !HAVE_ROUND
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static av_always_inline av_const double round(double x)
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{
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    return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
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}
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#endif /* HAVE_ROUND */
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#if !HAVE_ROUNDF
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static av_always_inline av_const float roundf(float x)
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{
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    return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
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}
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#endif /* HAVE_ROUNDF */
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#if !HAVE_TRUNCF
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static av_always_inline av_const float truncf(float x)
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{
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    return (x > 0) ? floor(x) : ceil(x);
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}
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#endif /* HAVE_TRUNCF */
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#endif /* AVUTIL_LIBM_H */