*
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavutil/intfloat_readwrite.c
+ * @file
* portable IEEE float/double read/write functions
*/
-#include "common.h"
+#include <stdint.h>
+#include "mathematics.h"
#include "intfloat_readwrite.h"
double av_int2dbl(int64_t v){
- if(v+v > 0xFFEULL<<52)
- return 0.0/0.0;
+ if((uint64_t)v+v > 0xFFEULL<<52)
+ return NAN;
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;
+ if((uint32_t)v+v > 0xFF000000U)
+ return NAN;
return ldexp(((v&0x7FFFFF) + (1<<23)) * (v>>31|1), (v>>23&0xFF)-150);
}
m = (m<<8) + ext.mantissa[i];
e = (((int)ext.exponent[0]&0x7f)<<8) | ext.exponent[1];
if (e == 0x7fff && m)
- return 0.0/0.0;
+ return NAN;
e -= 16383 + 63; /* In IEEE 80 bits, the whole (i.e. 1.xxxx)
* mantissa bit is written as opposed to the
* single and double precision formats. */
ext.mantissa[i] = m>>(56-(i<<3));
} else if (f != 0.0) {
ext.exponent[0] = 0x7f; ext.exponent[1] = 0xff;
- if (f != 1/0.0)
+ if (f != INFINITY)
ext.mantissa[0] = ~0;
}
if (d < 0)
ext.exponent[0] |= 0x80;
return ext;
}
-