"fast unaligned" bytestream functions
[libav.git] / libavutil / intreadwrite.h
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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
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19#ifndef INTREADWRITE_H
20#define INTREADWRITE_H
21
22#ifdef __GNUC__
23
24struct unaligned_64 { uint64_t l; } __attribute__((packed));
25struct unaligned_32 { uint32_t l; } __attribute__((packed));
26struct unaligned_16 { uint16_t l; } __attribute__((packed));
27
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)
31
32#define ST16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
33#define ST32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
34
35#else /* __GNUC__ */
36
37#define LD16(a) (*((uint16_t*)(a)))
38#define LD32(a) (*((uint32_t*)(a)))
39#define LD64(a) (*((uint64_t*)(a)))
40
41#define ST16(a, b) *((uint16_t*)(a)) = (b)
42#define ST32(a, b) *((uint32_t*)(a)) = (b)
43
44#endif /* !__GNUC__ */
45
46/* endian macros */
85b1a722 47#define AV_RB8(x) (((uint8_t*)(x))[0])
7d4495da 48#define AV_WB8(p, d) { ((uint8_t*)(p))[0] = (d); }
a3550abd 49
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50#define AV_RL8(x) AV_RB8(x)
51#define AV_WL8(p, d) AV_WB8(p, d)
52
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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)
57
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))
63
64# define AV_RL16(x) LD16(x)
65# define AV_WL16(p, d) ST16(p, d)
66# endif
67#else /* HAVE_FAST_UNALIGNED */
85b1a722 68#define AV_RB16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
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69#define AV_WB16(p, d) { \
70 ((uint8_t*)(p))[1] = (d); \
71 ((uint8_t*)(p))[0] = (d)>>8; }
a3550abd 72
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73#define AV_RL16(x) ((((uint8_t*)(x))[1] << 8) | \
74 ((uint8_t*)(x))[0])
75#define AV_WL16(p, d) { \
76 ((uint8_t*)(p))[0] = (d); \
77 ((uint8_t*)(p))[1] = (d)>>8; }
7b829d2a 78#endif
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79
80#define AV_RB24(x) ((((uint8_t*)(x))[0] << 16) | \
81 (((uint8_t*)(x))[1] << 8) | \
82 ((uint8_t*)(x))[2])
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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; }
87
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88#define AV_RL24(x) ((((uint8_t*)(x))[2] << 16) | \
89 (((uint8_t*)(x))[1] << 8) | \
90 ((uint8_t*)(x))[0])
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; }
95
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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)
100
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))
106
107# define AV_RL32(x) LD32(x)
108# define AV_WL32(p, d) ST32(p, d)
109# endif
110#else /* HAVE_FAST_UNALIGNED */
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111#define AV_RB32(x) ((((uint8_t*)(x))[0] << 24) | \
112 (((uint8_t*)(x))[1] << 16) | \
113 (((uint8_t*)(x))[2] << 8) | \
114 ((uint8_t*)(x))[3])
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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; }
a3550abd 120
a3550abd 121#define AV_RL32(x) ((((uint8_t*)(x))[3] << 24) | \
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122 (((uint8_t*)(x))[2] << 16) | \
123 (((uint8_t*)(x))[1] << 8) | \
124 ((uint8_t*)(x))[0])
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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; }
7b829d2a 130#endif
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131
132#endif /* INTREADWRITE_H */