1 /*

     2  * Copyright (c) 2011 Mans Rullgard

     3  *

     4  * This file is part of Libav.

     5  *

     6  * Libav 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 2.1 of the License, or (at your option) any later version.

    10  *

    11  * Libav 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 Libav; if not, write to the Free Software

    18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

    19  */

    20 

    21 #ifndef AVUTIL_INTFLOAT_H

    22 #define AVUTIL_INTFLOAT_H

    23 

    24 #include <stdint.h>

    25 #include "attributes.h"

    26 

    27 union av_intfloat32 {

    28     uint32_t i;

    29     float    f;

    30 };

    31 

    32 union av_intfloat64 {

    33     uint64_t i;

    34     double   f;

    35 };

    36 

    37 /**

    38  * Reinterpret a 32-bit integer as a float.

    39  */

    40 static av_always_inline float av_int2float(uint32_t i)

    41 {

    42     union av_intfloat32 v;

    43     v.i = i;

    44     return v.f;

    45 }

    46 

    47 /**

    48  * Reinterpret a float as a 32-bit integer.

    49  */

    50 static av_always_inline uint32_t av_float2int(float f)

    51 {

    52     union av_intfloat32 v;

    53     v.f = f;

    54     return v.i;

    55 }

    56 

    57 /**

    58  * Reinterpret a 64-bit integer as a double.

    59  */

    60 static av_always_inline double av_int2double(uint64_t i)

    61 {

    62     union av_intfloat64 v;

    63     v.i = i;

    64     return v.f;

    65 }

    66 

    67 /**

    68  * Reinterpret a double as a 64-bit integer.

    69  */

    70 static av_always_inline uint64_t av_double2int(double f)

    71 {

    72     union av_intfloat64 v;

    73     v.f = f;

    74     return v.i;

    75 }

    76 

    77 #endif /* AVUTIL_INTFLOAT_H */