add missing #includes
[libav.git] / libavutil / intfloat_readwrite.c
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1/*
2 * portable IEEE float/double read/write functions
3 *
4 * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
5509bffa 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
c11c2bc2 19 */
115329f1 20
c11c2bc2
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21/**
22 * @file intfloat_readwrite.c
23 * Portable IEEE float/double read/write functions.
24 */
115329f1 25
c11c2bc2 26#include "common.h"
a851b8e8 27#include "intfloat_readwrite.h"
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28
29double av_int2dbl(int64_t v){
30 if(v+v > 0xFFELLU<<52)
31 return 0.0/0.0;
bf4e3bd2 32 return ldexp(((v&((1LL<<52)-1)) + (1LL<<52)) * (v>>63|1), (v>>52&0x7FF)-1075);
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33}
34
35float av_int2flt(int32_t v){
36 if(v+v > 0xFF000000U)
37 return 0.0/0.0;
38 return ldexp(((v&0x7FFFFF) + (1<<23)) * (v>>31|1), (v>>23&0xFF)-150);
39}
40
41int64_t av_dbl2int(double d){
42 int e;
43 if ( !d) return 0;
44 else if(d-d) return 0x7FF0000000000000LL + ((int64_t)(d<0)<<63) + (d!=d);
45 d= frexp(d, &e);
46 return (int64_t)(d<0)<<63 | (e+1022LL)<<52 | (int64_t)((fabs(d)-0.5)*(1LL<<53));
47}
48
49int32_t av_flt2int(float d){
50 int e;
51 if ( !d) return 0;
52 else if(d-d) return 0x7F800000 + ((d<0)<<31) + (d!=d);
53 d= frexp(d, &e);
54 return (d<0)<<31 | (e+126)<<23 | (int64_t)((fabs(d)-0.5)*(1<<24));
55}