Statistics
| Branch: | Revision:

ffmpeg / libavutil / intreadwrite.h @ 57c36bdc

History | View | Annotate | Download (8.21 KB)

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 AVUTIL_INTREADWRITE_H
20
#define AVUTIL_INTREADWRITE_H
21

    
22
#include <stdint.h>
23
#include "config.h"
24
#include "bswap.h"
25

    
26
/*
27
 * Arch-specific headers can provide any combination of
28
 * AV_[RW][BLN](16|24|32|64) macros.  Preprocessor symbols must be
29
 * defined, even if these are implemented as inline functions.
30
 */
31

    
32
#if   ARCH_ARM
33
#   include "arm/intreadwrite.h"
34
#elif ARCH_MIPS
35
#   include "mips/intreadwrite.h"
36
#elif ARCH_PPC
37
#   include "ppc/intreadwrite.h"
38
#endif
39

    
40
/*
41
 * Define AV_[RW]N helper macros to simplify definitions not provided
42
 * by per-arch headers.
43
 */
44

    
45
#if   HAVE_ATTRIBUTE_PACKED
46

    
47
struct unaligned_64 { uint64_t l; } __attribute__((packed));
48
struct unaligned_32 { uint32_t l; } __attribute__((packed));
49
struct unaligned_16 { uint16_t l; } __attribute__((packed));
50

    
51
#   define AV_RN(s, p) (((const struct unaligned_##s *) (p))->l)
52
#   define AV_WN(s, p, v) (((struct unaligned_##s *) (p))->l) = (v)
53

    
54
#elif defined(__DECC)
55

    
56
#   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
57
#   define AV_WN(s, p, v) *((__unaligned uint##s##_t*)(p)) = (v)
58

    
59
#elif HAVE_FAST_UNALIGNED
60

    
61
#   define AV_RN(s, p) (*((const uint##s##_t*)(p)))
62
#   define AV_WN(s, p, v) *((uint##s##_t*)(p)) = (v)
63

    
64
#else
65

    
66
#ifndef AV_RB16
67
#define AV_RB16(x)  ((((const uint8_t*)(x))[0] << 8) | \
68
                      ((const uint8_t*)(x))[1])
69
#endif
70
#ifndef AV_WB16
71
#define AV_WB16(p, d) do { \
72
                    ((uint8_t*)(p))[1] = (d); \
73
                    ((uint8_t*)(p))[0] = (d)>>8; } while(0)
74
#endif
75

    
76
#ifndef AV_RL16
77
#define AV_RL16(x)  ((((const uint8_t*)(x))[1] << 8) | \
78
                      ((const uint8_t*)(x))[0])
79
#endif
80
#ifndef AV_WL16
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
#ifndef AV_RB32
87
#define AV_RB32(x)  ((((const uint8_t*)(x))[0] << 24) | \
88
                     (((const uint8_t*)(x))[1] << 16) | \
89
                     (((const uint8_t*)(x))[2] <<  8) | \
90
                      ((const uint8_t*)(x))[3])
91
#endif
92
#ifndef AV_WB32
93
#define AV_WB32(p, d) do { \
94
                    ((uint8_t*)(p))[3] = (d); \
95
                    ((uint8_t*)(p))[2] = (d)>>8; \
96
                    ((uint8_t*)(p))[1] = (d)>>16; \
97
                    ((uint8_t*)(p))[0] = (d)>>24; } while(0)
98
#endif
99

    
100
#ifndef AV_RL32
101
#define AV_RL32(x) ((((const uint8_t*)(x))[3] << 24) | \
102
                    (((const uint8_t*)(x))[2] << 16) | \
103
                    (((const uint8_t*)(x))[1] <<  8) | \
104
                     ((const uint8_t*)(x))[0])
105
#endif
106
#ifndef AV_WL32
107
#define AV_WL32(p, d) do { \
108
                    ((uint8_t*)(p))[0] = (d); \
109
                    ((uint8_t*)(p))[1] = (d)>>8; \
110
                    ((uint8_t*)(p))[2] = (d)>>16; \
111
                    ((uint8_t*)(p))[3] = (d)>>24; } while(0)
112
#endif
113

    
114
#ifndef AV_RB64
115
#define AV_RB64(x)  (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
116
                     ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
117
                     ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
118
                     ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
119
                     ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
120
                     ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
121
                     ((uint64_t)((const uint8_t*)(x))[6] <<  8) | \
122
                      (uint64_t)((const uint8_t*)(x))[7])
123
#endif
124
#ifndef AV_WB64
125
#define AV_WB64(p, d) do { \
126
                    ((uint8_t*)(p))[7] = (d);     \
127
                    ((uint8_t*)(p))[6] = (d)>>8;  \
128
                    ((uint8_t*)(p))[5] = (d)>>16; \
129
                    ((uint8_t*)(p))[4] = (d)>>24; \
130
                    ((uint8_t*)(p))[3] = (d)>>32; \
131
                    ((uint8_t*)(p))[2] = (d)>>40; \
132
                    ((uint8_t*)(p))[1] = (d)>>48; \
133
                    ((uint8_t*)(p))[0] = (d)>>56; } while(0)
134
#endif
135

    
136
#ifndef AV_RL64
137
#define AV_RL64(x)  (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
138
                     ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
139
                     ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
140
                     ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
141
                     ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
142
                     ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
143
                     ((uint64_t)((const uint8_t*)(x))[1] <<  8) | \
144
                      (uint64_t)((const uint8_t*)(x))[0])
145
#endif
146
#ifndef AV_WL64
147
#define AV_WL64(p, d) do { \
148
                    ((uint8_t*)(p))[0] = (d);     \
149
                    ((uint8_t*)(p))[1] = (d)>>8;  \
150
                    ((uint8_t*)(p))[2] = (d)>>16; \
151
                    ((uint8_t*)(p))[3] = (d)>>24; \
152
                    ((uint8_t*)(p))[4] = (d)>>32; \
153
                    ((uint8_t*)(p))[5] = (d)>>40; \
154
                    ((uint8_t*)(p))[6] = (d)>>48; \
155
                    ((uint8_t*)(p))[7] = (d)>>56; } while(0)
156
#endif
157

    
158
#if HAVE_BIGENDIAN
159
#   define AV_RN(s, p)    AV_RB##s(p)
160
#   define AV_WN(s, p, v) AV_WB##s(p, v)
161
#else
162
#   define AV_RN(s, p)    AV_RL##s(p)
163
#   define AV_WN(s, p, v) AV_WL##s(p, v)
164
#endif
165

    
166
#endif /* HAVE_FAST_UNALIGNED */
167

    
168
#ifndef AV_RN16
169
#   define AV_RN16(p) AV_RN(16, p)
170
#endif
171

    
172
#ifndef AV_RN32
173
#   define AV_RN32(p) AV_RN(32, p)
174
#endif
175

    
176
#ifndef AV_RN64
177
#   define AV_RN64(p) AV_RN(64, p)
178
#endif
179

    
180
#ifndef AV_WN16
181
#   define AV_WN16(p, v) AV_WN(16, p, v)
182
#endif
183

    
184
#ifndef AV_WN32
185
#   define AV_WN32(p, v) AV_WN(32, p, v)
186
#endif
187

    
188
#ifndef AV_WN64
189
#   define AV_WN64(p, v) AV_WN(64, p, v)
190
#endif
191

    
192
#if HAVE_BIGENDIAN
193
#   define AV_RB(s, p)    AV_RN(s, p)
194
#   define AV_WB(s, p, v) AV_WN(s, p, v)
195
#   define AV_RL(s, p)    bswap_##s(AV_RN(s, p))
196
#   define AV_WL(s, p, v) AV_WN(s, p, bswap_##s(v))
197
#else
198
#   define AV_RB(s, p)    bswap_##s(AV_RN(s, p))
199
#   define AV_WB(s, p, v) AV_WN(s, p, bswap_##s(v))
200
#   define AV_RL(s, p)    AV_RN(s, p)
201
#   define AV_WL(s, p, v) AV_WN(s, p, v)
202
#endif
203

    
204
#define AV_RB8(x)     (((const uint8_t*)(x))[0])
205
#define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)
206

    
207
#define AV_RL8(x)     AV_RB8(x)
208
#define AV_WL8(p, d)  AV_WB8(p, d)
209

    
210
#ifndef AV_RB16
211
#   define AV_RB16(p)    AV_RB(16, p)
212
#endif
213
#ifndef AV_WB16
214
#   define AV_WB16(p, v) AV_WB(16, p, v)
215
#endif
216

    
217
#ifndef AV_RL16
218
#   define AV_RL16(p)    AV_RL(16, p)
219
#endif
220
#ifndef AV_WL16
221
#   define AV_WL16(p, v) AV_WL(16, p, v)
222
#endif
223

    
224
#ifndef AV_RB32
225
#   define AV_RB32(p)    AV_RB(32, p)
226
#endif
227
#ifndef AV_WB32
228
#   define AV_WB32(p, v) AV_WB(32, p, v)
229
#endif
230

    
231
#ifndef AV_RL32
232
#   define AV_RL32(p)    AV_RL(32, p)
233
#endif
234
#ifndef AV_WL32
235
#   define AV_WL32(p, v) AV_WL(32, p, v)
236
#endif
237

    
238
#ifndef AV_RB64
239
#   define AV_RB64(p)    AV_RB(64, p)
240
#endif
241
#ifndef AV_WB64
242
#   define AV_WB64(p, v) AV_WB(64, p, v)
243
#endif
244

    
245
#ifndef AV_RL64
246
#   define AV_RL64(p)    AV_RL(64, p)
247
#endif
248
#ifndef AV_WL64
249
#   define AV_WL64(p, v) AV_WL(64, p, v)
250
#endif
251

    
252
#ifndef AV_RB24
253
#define AV_RB24(x)  ((((const uint8_t*)(x))[0] << 16) | \
254
                     (((const uint8_t*)(x))[1] <<  8) | \
255
                      ((const uint8_t*)(x))[2])
256
#endif
257
#ifndef AV_WB24
258
#define AV_WB24(p, d) do { \
259
                    ((uint8_t*)(p))[2] = (d); \
260
                    ((uint8_t*)(p))[1] = (d)>>8; \
261
                    ((uint8_t*)(p))[0] = (d)>>16; } while(0)
262
#endif
263

    
264
#ifndef AV_RL24
265
#define AV_RL24(x)  ((((const uint8_t*)(x))[2] << 16) | \
266
                     (((const uint8_t*)(x))[1] <<  8) | \
267
                      ((const uint8_t*)(x))[0])
268
#endif
269
#ifndef AV_WL24
270
#define AV_WL24(p, d) do { \
271
                    ((uint8_t*)(p))[0] = (d); \
272
                    ((uint8_t*)(p))[1] = (d)>>8; \
273
                    ((uint8_t*)(p))[2] = (d)>>16; } while(0)
274
#endif
275

    
276
#endif /* AVUTIL_INTREADWRITE_H */