FFmpeg 5.1.6
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
58static 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
66static 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
73static 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 */
Macro definitions for various function/variable attributes.
#define av_always_inline
Definition: attributes.h:45
#define av_const
Definition: attributes.h:82
static uint64_t av_const av_bswap64(uint64_t x)
Definition: bswap.h:73
#define AV_BSWAP32C(x)
Definition: bswap.h:52
static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
Definition: bswap.h:58
static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
Definition: bswap.h:66