Add #include "config.h" to headers that need it.
[libav.git] / libavutil / intreadwrite.h
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #ifndef FFMPEG_INTREADWRITE_H
20 #define FFMPEG_INTREADWRITE_H
21
22 #include <stdint.h>
23 #include "config.h"
24 #include "bswap.h"
25
26 #ifdef __GNUC__
27
28 struct unaligned_64 { uint64_t l; } __attribute__((packed));
29 struct unaligned_32 { uint32_t l; } __attribute__((packed));
30 struct unaligned_16 { uint16_t l; } __attribute__((packed));
31
32 #define AV_RN16(a) (((const struct unaligned_16 *) (a))->l)
33 #define AV_RN32(a) (((const struct unaligned_32 *) (a))->l)
34 #define AV_RN64(a) (((const struct unaligned_64 *) (a))->l)
35
36 #define AV_WN16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
37 #define AV_WN32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
38 #define AV_WN64(a, b) (((struct unaligned_64 *) (a))->l) = (b)
39
40 #else /* __GNUC__ */
41
42 #define AV_RN16(a) (*((const uint16_t*)(a)))
43 #define AV_RN32(a) (*((const uint32_t*)(a)))
44 #define AV_RN64(a) (*((const uint64_t*)(a)))
45
46 #define AV_WN16(a, b) *((uint16_t*)(a)) = (b)
47 #define AV_WN32(a, b) *((uint32_t*)(a)) = (b)
48 #define AV_WN64(a, b) *((uint64_t*)(a)) = (b)
49
50 #endif /* !__GNUC__ */
51
52 /* endian macros */
53 #define AV_RB8(x) (((const uint8_t*)(x))[0])
54 #define AV_WB8(p, d) do { ((uint8_t*)(p))[0] = (d); } while(0)
55
56 #define AV_RL8(x) AV_RB8(x)
57 #define AV_WL8(p, d) AV_WB8(p, d)
58
59 #ifdef HAVE_FAST_UNALIGNED
60 # ifdef WORDS_BIGENDIAN
61 # define AV_RB16(x) AV_RN16(x)
62 # define AV_WB16(p, d) AV_WN16(p, d)
63
64 # define AV_RL16(x) bswap_16(AV_RN16(x))
65 # define AV_WL16(p, d) AV_WN16(p, bswap_16(d))
66 # else /* WORDS_BIGENDIAN */
67 # define AV_RB16(x) bswap_16(AV_RN16(x))
68 # define AV_WB16(p, d) AV_WN16(p, bswap_16(d))
69
70 # define AV_RL16(x) AV_RN16(x)
71 # define AV_WL16(p, d) AV_WN16(p, d)
72 # endif
73 #else /* HAVE_FAST_UNALIGNED */
74 #define AV_RB16(x) ((((const uint8_t*)(x))[0] << 8) | ((const uint8_t*)(x))[1])
75 #define AV_WB16(p, d) do { \
76 ((uint8_t*)(p))[1] = (d); \
77 ((uint8_t*)(p))[0] = (d)>>8; } while(0)
78
79 #define AV_RL16(x) ((((const uint8_t*)(x))[1] << 8) | \
80 ((const uint8_t*)(x))[0])
81 #define AV_WL16(p, d) do { \
82 ((uint8_t*)(p))[0] = (d); \
83 ((uint8_t*)(p))[1] = (d)>>8; } while(0)
84 #endif
85
86 #define AV_RB24(x) ((((const uint8_t*)(x))[0] << 16) | \
87 (((const uint8_t*)(x))[1] << 8) | \
88 ((const uint8_t*)(x))[2])
89 #define AV_WB24(p, d) do { \
90 ((uint8_t*)(p))[2] = (d); \
91 ((uint8_t*)(p))[1] = (d)>>8; \
92 ((uint8_t*)(p))[0] = (d)>>16; } while(0)
93
94 #define AV_RL24(x) ((((const uint8_t*)(x))[2] << 16) | \
95 (((const uint8_t*)(x))[1] << 8) | \
96 ((const uint8_t*)(x))[0])
97 #define AV_WL24(p, d) do { \
98 ((uint8_t*)(p))[0] = (d); \
99 ((uint8_t*)(p))[1] = (d)>>8; \
100 ((uint8_t*)(p))[2] = (d)>>16; } while(0)
101
102 #ifdef HAVE_FAST_UNALIGNED
103 # ifdef WORDS_BIGENDIAN
104 # define AV_RB32(x) AV_RN32(x)
105 # define AV_WB32(p, d) AV_WN32(p, d)
106
107 # define AV_RL32(x) bswap_32(AV_RN32(x))
108 # define AV_WL32(p, d) AV_WN32(p, bswap_32(d))
109 # else /* WORDS_BIGENDIAN */
110 # define AV_RB32(x) bswap_32(AV_RN32(x))
111 # define AV_WB32(p, d) AV_WN32(p, bswap_32(d))
112
113 # define AV_RL32(x) AV_RN32(x)
114 # define AV_WL32(p, d) AV_WN32(p, d)
115 # endif
116 #else /* HAVE_FAST_UNALIGNED */
117 #define AV_RB32(x) ((((const uint8_t*)(x))[0] << 24) | \
118 (((const uint8_t*)(x))[1] << 16) | \
119 (((const uint8_t*)(x))[2] << 8) | \
120 ((const uint8_t*)(x))[3])
121 #define AV_WB32(p, d) do { \
122 ((uint8_t*)(p))[3] = (d); \
123 ((uint8_t*)(p))[2] = (d)>>8; \
124 ((uint8_t*)(p))[1] = (d)>>16; \
125 ((uint8_t*)(p))[0] = (d)>>24; } while(0)
126
127 #define AV_RL32(x) ((((const uint8_t*)(x))[3] << 24) | \
128 (((const uint8_t*)(x))[2] << 16) | \
129 (((const uint8_t*)(x))[1] << 8) | \
130 ((const uint8_t*)(x))[0])
131 #define AV_WL32(p, d) do { \
132 ((uint8_t*)(p))[0] = (d); \
133 ((uint8_t*)(p))[1] = (d)>>8; \
134 ((uint8_t*)(p))[2] = (d)>>16; \
135 ((uint8_t*)(p))[3] = (d)>>24; } while(0)
136 #endif
137
138 #ifdef HAVE_FAST_UNALIGNED
139 # ifdef WORDS_BIGENDIAN
140 # define AV_RB64(x) AV_RN64(x)
141 # define AV_WB64(p, d) AV_WN64(p, d)
142
143 # define AV_RL64(x) bswap_64(AV_RN64(x))
144 # define AV_WL64(p, d) AV_WN64(p, bswap_64(d))
145 # else /* WORDS_BIGENDIAN */
146 # define AV_RB64(x) bswap_64(AV_RN64(x))
147 # define AV_WB64(p, d) AV_WN64(p, bswap_64(d))
148
149 # define AV_RL64(x) AV_RN64(x)
150 # define AV_WL64(p, d) AV_WN64(p, d)
151 # endif
152 #else /* HAVE_FAST_UNALIGNED */
153 #define AV_RB64(x) (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
154 ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
155 ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
156 ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
157 ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
158 ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
159 ((uint64_t)((const uint8_t*)(x))[6] << 8) | \
160 (uint64_t)((const uint8_t*)(x))[7])
161 #define AV_WB64(p, d) do { \
162 ((uint8_t*)(p))[7] = (d); \
163 ((uint8_t*)(p))[6] = (d)>>8; \
164 ((uint8_t*)(p))[5] = (d)>>16; \
165 ((uint8_t*)(p))[4] = (d)>>24; \
166 ((uint8_t*)(p))[3] = (d)>>32; \
167 ((uint8_t*)(p))[2] = (d)>>40; \
168 ((uint8_t*)(p))[1] = (d)>>48; \
169 ((uint8_t*)(p))[0] = (d)>>56; } while(0)
170
171 #define AV_RL64(x) (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
172 ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
173 ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
174 ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
175 ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
176 ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
177 ((uint64_t)((const uint8_t*)(x))[1] << 8) | \
178 (uint64_t)((const uint8_t*)(x))[0])
179 #define AV_WL64(p, d) do { \
180 ((uint8_t*)(p))[0] = (d); \
181 ((uint8_t*)(p))[1] = (d)>>8; \
182 ((uint8_t*)(p))[2] = (d)>>16; \
183 ((uint8_t*)(p))[3] = (d)>>24; \
184 ((uint8_t*)(p))[4] = (d)>>32; \
185 ((uint8_t*)(p))[5] = (d)>>40; \
186 ((uint8_t*)(p))[6] = (d)>>48; \
187 ((uint8_t*)(p))[7] = (d)>>56; } while(0)
188 #endif
189
190 #endif /* FFMPEG_INTREADWRITE_H */