55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
|
|
* portable IEEE float/double read/write functions
|
|
*
|
|
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* 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 intfloat_readwrite.c
|
|
* Portable IEEE float/double read/write functions.
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
double av_int2dbl(int64_t v){
|
|
if(v+v > 0xFFELLU<<52)
|
|
return 0.0/0.0;
|
|
return ldexp(((v&((1LL<<52)-1)) + (1LL<<52)) * (v>>63|1), (v>>52&0x7FF)-1075);
|
|
}
|
|
|
|
float av_int2flt(int32_t v){
|
|
if(v+v > 0xFF000000U)
|
|
return 0.0/0.0;
|
|
return ldexp(((v&0x7FFFFF) + (1<<23)) * (v>>31|1), (v>>23&0xFF)-150);
|
|
}
|
|
|
|
int64_t av_dbl2int(double d){
|
|
int e;
|
|
if ( !d) return 0;
|
|
else if(d-d) return 0x7FF0000000000000LL + ((int64_t)(d<0)<<63) + (d!=d);
|
|
d= frexp(d, &e);
|
|
return (int64_t)(d<0)<<63 | (e+1022LL)<<52 | (int64_t)((fabs(d)-0.5)*(1LL<<53));
|
|
}
|
|
|
|
int32_t av_flt2int(float d){
|
|
int e;
|
|
if ( !d) return 0;
|
|
else if(d-d) return 0x7F800000 + ((d<0)<<31) + (d!=d);
|
|
d= frexp(d, &e);
|
|
return (d<0)<<31 | (e+126)<<23 | (int64_t)((fabs(d)-0.5)*(1<<24));
|
|
}
|