2 * This file is part of FFmpeg.
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.
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.
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
19 #ifndef INTREADWRITE_H
20 #define INTREADWRITE_H
24 struct unaligned_64 { uint64_t l; } __attribute__((packed));
25 struct unaligned_32 { uint32_t l; } __attribute__((packed));
26 struct unaligned_16 { uint16_t l; } __attribute__((packed));
28 #define LD16(a) (((const struct unaligned_16 *) (a))->l)
29 #define LD32(a) (((const struct unaligned_32 *) (a))->l)
30 #define LD64(a) (((const struct unaligned_64 *) (a))->l)
32 #define ST16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
33 #define ST32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
37 #define LD16(a) (*((uint16_t*)(a)))
38 #define LD32(a) (*((uint32_t*)(a)))
39 #define LD64(a) (*((uint64_t*)(a)))
41 #define ST16(a, b) *((uint16_t*)(a)) = (b)
42 #define ST32(a, b) *((uint32_t*)(a)) = (b)
44 #endif /* !__GNUC__ */
47 #define AV_RB8(x) (((uint8_t*)(x))[0])
48 #define AV_WB8(p, d) { ((uint8_t*)(p))[0] = (d); }
50 #define AV_RL8(x) AV_RB8(x)
51 #define AV_WL8(p, d) AV_WB8(p, d)
53 #ifdef HAVE_FAST_UNALIGNED
54 # ifdef WORDS_BIGENDIAN
55 # define AV_RB16(x) LD16(x)
56 # define AV_WB16(p, d) ST16(p, d)
58 # define AV_RL16(x) bswap_16(LD16(x))
59 # define AV_WL16(p, d) ST16(p, bswap_16(d))
60 # else /* WORDS_BIGENDIAN */
61 # define AV_RB16(x) bswap_16(LD16(x))
62 # define AV_WB16(p, d) ST16(p, bswap_16(d))
64 # define AV_RL16(x) LD16(x)
65 # define AV_WL16(p, d) ST16(p, d)
67 #else /* HAVE_FAST_UNALIGNED */
68 #define AV_RB16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
69 #define AV_WB16(p, d) { \
70 ((uint8_t*)(p))[1] = (d); \
71 ((uint8_t*)(p))[0] = (d)>>8; }
73 #define AV_RL16(x) ((((uint8_t*)(x))[1] << 8) | \
75 #define AV_WL16(p, d) { \
76 ((uint8_t*)(p))[0] = (d); \
77 ((uint8_t*)(p))[1] = (d)>>8; }
80 #define AV_RB24(x) ((((uint8_t*)(x))[0] << 16) | \
81 (((uint8_t*)(x))[1] << 8) | \
83 #define AV_WB24(p, d) { \
84 ((uint8_t*)(p))[2] = (d); \
85 ((uint8_t*)(p))[1] = (d)>>8; \
86 ((uint8_t*)(p))[0] = (d)>>16; }
88 #define AV_RL24(x) ((((uint8_t*)(x))[2] << 16) | \
89 (((uint8_t*)(x))[1] << 8) | \
91 #define AV_WL24(p, d) { \
92 ((uint8_t*)(p))[0] = (d); \
93 ((uint8_t*)(p))[1] = (d)>>8; \
94 ((uint8_t*)(p))[2] = (d)>>16; }
96 #ifdef HAVE_FAST_UNALIGNED
97 # ifdef WORDS_BIGENDIAN
98 # define AV_RB32(x) LD32(x)
99 # define AV_WB32(p, d) ST32(p, d)
101 # define AV_RL32(x) bswap_32(LD32(x))
102 # define AV_WL32(p, d) ST32(p, bswap_32(d))
103 # else /* WORDS_BIGENDIAN */
104 # define AV_RB32(x) bswap_32(LD32(x))
105 # define AV_WB32(p, d) ST32(p, bswap_32(d))
107 # define AV_RL32(x) LD32(x)
108 # define AV_WL32(p, d) ST32(p, d)
110 #else /* HAVE_FAST_UNALIGNED */
111 #define AV_RB32(x) ((((uint8_t*)(x))[0] << 24) | \
112 (((uint8_t*)(x))[1] << 16) | \
113 (((uint8_t*)(x))[2] << 8) | \
115 #define AV_WB32(p, d) { \
116 ((uint8_t*)(p))[3] = (d); \
117 ((uint8_t*)(p))[2] = (d)>>8; \
118 ((uint8_t*)(p))[1] = (d)>>16; \
119 ((uint8_t*)(p))[0] = (d)>>24; }
121 #define AV_RL32(x) ((((uint8_t*)(x))[3] << 24) | \
122 (((uint8_t*)(x))[2] << 16) | \
123 (((uint8_t*)(x))[1] << 8) | \
125 #define AV_WL32(p, d) { \
126 ((uint8_t*)(p))[0] = (d); \
127 ((uint8_t*)(p))[1] = (d)>>8; \
128 ((uint8_t*)(p))[2] = (d)>>16; \
129 ((uint8_t*)(p))[3] = (d)>>24; }
132 #endif /* INTREADWRITE_H */