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 "config.h"
31#include "attributes.h"
32
33#if   ARCH_ARM
34#   include "arm/bswap.h"
35#elif ARCH_AVR32
36#   include "avr32/bswap.h"
37#elif ARCH_BFIN
38#   include "bfin/bswap.h"
39#elif ARCH_SH4
40#   include "sh4/bswap.h"
41#elif ARCH_X86
42#   include "x86/bswap.h"
43#endif
44
45#define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
46#define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
47#define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
48
49#define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
50
51#ifndef bswap_16
52static av_always_inline av_const uint16_t bswap_16(uint16_t x)
53{
54    x= (x>>8) | (x<<8);
55    return x;
56}
57#endif
58
59#ifndef bswap_32
60static av_always_inline av_const uint32_t bswap_32(uint32_t x)
61{
62    x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
63    x= (x>>16) | (x<<16);
64    return x;
65}
66#endif
67
68#ifndef bswap_64
69static inline uint64_t av_const bswap_64(uint64_t x)
70{
71#if 0
72    x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
73    x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
74    return (x>>32) | (x<<32);
75#else
76    union {
77        uint64_t ll;
78        uint32_t l[2];
79    } w, r;
80    w.ll = x;
81    r.l[0] = bswap_32 (w.l[1]);
82    r.l[1] = bswap_32 (w.l[0]);
83    return r.ll;
84#endif
85}
86#endif
87
88// be2me ... big-endian to machine-endian
89// le2me ... little-endian to machine-endian
90
91#if HAVE_BIGENDIAN
92#define be2me_16(x) (x)
93#define be2me_32(x) (x)
94#define be2me_64(x) (x)
95#define le2me_16(x) bswap_16(x)
96#define le2me_32(x) bswap_32(x)
97#define le2me_64(x) bswap_64(x)
98#define AV_BE2MEC(s, x) (x)
99#define AV_LE2MEC(s, x) AV_BSWAPC(s, x)
100#else
101#define be2me_16(x) bswap_16(x)
102#define be2me_32(x) bswap_32(x)
103#define be2me_64(x) bswap_64(x)
104#define le2me_16(x) (x)
105#define le2me_32(x) (x)
106#define le2me_64(x) (x)
107#define AV_BE2MEC(s, x) AV_BSWAPC(s, x)
108#define AV_LE2MEC(s, x) (x)
109#endif
110
111#define AV_BE2ME16C(x) AV_BE2MEC(16, x)
112#define AV_BE2ME32C(x) AV_BE2MEC(32, x)
113#define AV_BE2ME64C(x) AV_BE2MEC(64, x)
114#define AV_LE2ME16C(x) AV_LE2MEC(16, x)
115#define AV_LE2ME32C(x) AV_LE2MEC(32, x)
116#define AV_LE2ME64C(x) AV_LE2MEC(64, x)
117
118#endif /* AVUTIL_BSWAP_H */
119