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comparison lib/libavutil/intfloat.h @ 2134:992d2e6f907d

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preparation for libavcodec
author zipi
date Tue, 31 Dec 2013 14:52:14 +0000
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2133:e378232bfd36 2134:992d2e6f907d
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 */