AOMedia Codec SDK: aom/aom_integer.h Source File

AOMedia Codec SDK

aom_integer.h
1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11 #ifndef AOM_AOM_AOM_INTEGER_H_
12 #define AOM_AOM_AOM_INTEGER_H_
13
14 /* get ptrdiff_t, size_t, wchar_t, NULL */
15 #include <stddef.h>
16
17 #if defined(_MSC_VER)
18 #define AOM_FORCE_INLINE __forceinline
19 #define AOM_INLINE __inline
20 #else
21 #define AOM_FORCE_INLINE __inline__ __attribute__((always_inline))
22 #define AOM_INLINE inline
23 #endif
24
25 #if defined(AOM_EMULATE_INTTYPES)
26 typedef signed char int8_t;
27 typedef signed short int16_t;
28 typedef signed int int32_t;
29
30 typedef unsigned char uint8_t;
31 typedef unsigned short uint16_t;
32 typedef unsigned int uint32_t;
33
34 #ifndef _UINTPTR_T_DEFINED
35 typedef size_t uintptr_t;
36 #endif
37
38 #else
39
40 /* Most platforms have the C99 standard integer types. */
41
42 #if defined(__cplusplus)
43 #if !defined(__STDC_FORMAT_MACROS)
44 #define __STDC_FORMAT_MACROS
45 #endif
46 #if !defined(__STDC_LIMIT_MACROS)
47 #define __STDC_LIMIT_MACROS
48 #endif
49 #endif // __cplusplus
50
51 #include <stdint.h>
52
53 #endif
54
55 /* VS2010 defines stdint.h, but not inttypes.h */
56 #if defined(_MSC_VER) && _MSC_VER < 1800
57 #define PRId64 "I64d"
58 #else
59 #include <inttypes.h>
60 #endif
61
62 #if !defined(INT8_MAX)
63 #define INT8_MAX 127
64 #endif
65
66 #if !defined(INT32_MAX)
67 #define INT32_MAX 2147483647
68 #endif
69
70 #if !defined(INT32_MIN)
71 #define INT32_MIN (-2147483647 - 1)
72 #endif
73
74 #if defined(__cplusplus)
75 extern "C" {
76 #endif // __cplusplus
77
78 // Returns size of uint64_t when encoded using LEB128.
79 size_t aom_uleb_size_in_bytes(uint64_t value);
80
81 // Returns 0 on success, -1 on decode failure.
82 // On success, 'value' stores the decoded LEB128 value and 'length' stores
83 // the number of bytes decoded.
84 int aom_uleb_decode(const uint8_t *buffer, size_t available, uint64_t *value,
85 size_t *length);
86
87 // Encodes LEB128 integer. Returns 0 when successful, and -1 upon failure.
88 int aom_uleb_encode(uint64_t value, size_t available, uint8_t *coded_value,
89 size_t *coded_size);
90
91 // Encodes LEB128 integer to size specified. Returns 0 when successful, and -1
92 // upon failure.
93 // Note: This will write exactly pad_to_size bytes; if the value cannot be
94 // encoded in this many bytes, then this will fail.
95 int aom_uleb_encode_fixed_size(uint64_t value, size_t available,
96 size_t pad_to_size, uint8_t *coded_value,
97 size_t *coded_size);
98
99 #if defined(__cplusplus)
100 } // extern "C"
101 #endif // __cplusplus
102
103 #endif // AOM_AOM_AOM_INTEGER_H_