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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 */ |