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bswap.h
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1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * byte swapping routines
24  */
25 
26 #ifndef AVUTIL_BSWAP_H
27 #define AVUTIL_BSWAP_H
28 
29 #include <stdint.h>
30 #include "libavutil/avconfig.h"
31 #include "attributes.h"
32 
33 #ifdef HAVE_AV_CONFIG_H
34 
35 #include "config.h"
36 
37 #if ARCH_AARCH64
38 # include "aarch64/bswap.h"
39 #elif ARCH_ARM
40 # include "arm/bswap.h"
41 #elif ARCH_AVR32
42 # include "avr32/bswap.h"
43 #elif ARCH_SH4
44 # include "sh4/bswap.h"
45 #elif ARCH_X86
46 # include "x86/bswap.h"
47 #endif
48 
49 #endif /* HAVE_AV_CONFIG_H */
50 
51 #define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff))
52 #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
53 #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
54 
55 #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
56 
57 #ifndef av_bswap16
58 static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
59 {
60  x= (x>>8) | (x<<8);
61  return x;
62 }
63 #endif
64 
65 #ifndef av_bswap32
66 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
67 {
68  return AV_BSWAP32C(x);
69 }
70 #endif
71 
72 #ifndef av_bswap64
73 static inline uint64_t av_const av_bswap64(uint64_t x)
74 {
75  return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
76 }
77 #endif
78 
79 // be2ne ... big-endian to native-endian
80 // le2ne ... little-endian to native-endian
81 
82 #if AV_HAVE_BIGENDIAN
83 #define av_be2ne16(x) (x)
84 #define av_be2ne32(x) (x)
85 #define av_be2ne64(x) (x)
86 #define av_le2ne16(x) av_bswap16(x)
87 #define av_le2ne32(x) av_bswap32(x)
88 #define av_le2ne64(x) av_bswap64(x)
89 #define AV_BE2NEC(s, x) (x)
90 #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
91 #else
92 #define av_be2ne16(x) av_bswap16(x)
93 #define av_be2ne32(x) av_bswap32(x)
94 #define av_be2ne64(x) av_bswap64(x)
95 #define av_le2ne16(x) (x)
96 #define av_le2ne32(x) (x)
97 #define av_le2ne64(x) (x)
98 #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
99 #define AV_LE2NEC(s, x) (x)
100 #endif
101 
102 #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
103 #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
104 #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
105 #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
106 #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
107 #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
108 
109 #endif /* AVUTIL_BSWAP_H */