Globally rename the header inclusion guard names.
[libav.git] / libavutil / bswap.h
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 bswap.h
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 "common.h"
32
33 #ifdef HAVE_BYTESWAP_H
34 #include <byteswap.h>
35 #else
36
37 static av_always_inline av_const uint16_t bswap_16(uint16_t x)
38 {
39 #if defined(ARCH_X86)
40 asm("rorw $8, %0" : "+r"(x));
41 #elif defined(ARCH_SH4)
42 asm("swap.b %0,%0" : "=r"(x) : "0"(x));
43 #elif defined(HAVE_ARMV6)
44 asm("rev16 %0, %0" : "+r"(x));
45 #else
46 x= (x>>8) | (x<<8);
47 #endif
48 return x;
49 }
50
51 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
52 {
53 #if defined(ARCH_X86)
54 #ifdef HAVE_BSWAP
55 asm("bswap %0" : "+r" (x));
56 #else
57 asm("rorw $8, %w0 \n\t"
58 "rorl $16, %0 \n\t"
59 "rorw $8, %w0"
60 : "+r"(x));
61 #endif
62 #elif defined(ARCH_SH4)
63 asm("swap.b %0,%0\n"
64 "swap.w %0,%0\n"
65 "swap.b %0,%0\n"
66 : "=r"(x) : "0"(x));
67 #elif defined(HAVE_ARMV6)
68 asm("rev %0, %0" : "+r"(x));
69 #elif defined(ARCH_ARMV4L)
70 uint32_t t;
71 asm ("eor %1, %0, %0, ror #16 \n\t"
72 "bic %1, %1, #0xFF0000 \n\t"
73 "mov %0, %0, ror #8 \n\t"
74 "eor %0, %0, %1, lsr #8 \n\t"
75 : "+r"(x), "+r"(t));
76 #elif defined(ARCH_BFIN)
77 unsigned tmp;
78 asm("%1 = %0 >> 8 (V); \n\t"
79 "%0 = %0 << 8 (V); \n\t"
80 "%0 = %0 | %1; \n\t"
81 "%0 = PACK(%0.L, %0.H); \n\t"
82 : "+d"(x), "=&d"(tmp));
83 #else
84 x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
85 x= (x>>16) | (x<<16);
86 #endif
87 return x;
88 }
89
90 static inline uint64_t av_const bswap_64(uint64_t x)
91 {
92 #if 0
93 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
94 x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
95 return (x>>32) | (x<<32);
96 #elif defined(ARCH_X86_64)
97 asm("bswap %0": "=r" (x) : "0" (x));
98 return x;
99 #else
100 union {
101 uint64_t ll;
102 uint32_t l[2];
103 } w, r;
104 w.ll = x;
105 r.l[0] = bswap_32 (w.l[1]);
106 r.l[1] = bswap_32 (w.l[0]);
107 return r.ll;
108 #endif
109 }
110
111 #endif /* !HAVE_BYTESWAP_H */
112
113 // be2me ... BigEndian to MachineEndian
114 // le2me ... LittleEndian to MachineEndian
115
116 #ifdef WORDS_BIGENDIAN
117 #define be2me_16(x) (x)
118 #define be2me_32(x) (x)
119 #define be2me_64(x) (x)
120 #define le2me_16(x) bswap_16(x)
121 #define le2me_32(x) bswap_32(x)
122 #define le2me_64(x) bswap_64(x)
123 #else
124 #define be2me_16(x) bswap_16(x)
125 #define be2me_32(x) bswap_32(x)
126 #define be2me_64(x) bswap_64(x)
127 #define le2me_16(x) (x)
128 #define le2me_32(x) (x)
129 #define le2me_64(x) (x)
130 #endif
131
132 #endif /* AVUTIL_BSWAP_H */