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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * memory handling functions
24 */
25
26#ifndef AVUTIL_MEM_H
27#define AVUTIL_MEM_H
28
29#include "attributes.h"
30#include "avutil.h"
31
32#if defined(__ICC) && _ICC < 1200 || defined(__SUNPRO_C)
33 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
34 #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
35#elif defined(__TI_COMPILER_VERSION__)
36 #define DECLARE_ALIGNED(n,t,v) \
37 AV_PRAGMA(DATA_ALIGN(v,n)) \
38 t __attribute__((aligned(n))) v
39 #define DECLARE_ASM_CONST(n,t,v) \
40 AV_PRAGMA(DATA_ALIGN(v,n)) \
41 static const t __attribute__((aligned(n))) v
42#elif defined(__GNUC__)
43 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
44 #define DECLARE_ASM_CONST(n,t,v) static const t attribute_used __attribute__ ((aligned (n))) v
45#elif defined(_MSC_VER)
46 #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
47 #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
48#else
49 #define DECLARE_ALIGNED(n,t,v) t v
50 #define DECLARE_ASM_CONST(n,t,v) static const t v
51#endif
52
53#if AV_GCC_VERSION_AT_LEAST(3,1)
54 #define av_malloc_attrib __attribute__((__malloc__))
55#else
56 #define av_malloc_attrib
57#endif
58
59#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
60 #define av_alloc_size(n) __attribute__((alloc_size(n)))
61#else
62 #define av_alloc_size(n)
63#endif
64
65/**
66 * Allocate a block of size bytes with alignment suitable for all
67 * memory accesses (including vectors if available on the CPU).
68 * @param size Size in bytes for the memory block to be allocated.
69 * @return Pointer to the allocated block, NULL if the block cannot
70 * be allocated.
71 * @see av_mallocz()
72 */
73void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1);
74
75/**
76 * Allocate or reallocate a block of memory.
77 * If ptr is NULL and size > 0, allocate a new block. If
78 * size is zero, free the memory block pointed to by ptr.
79 * @param size Size in bytes for the memory block to be allocated or
80 * reallocated.
81 * @param ptr Pointer to a memory block already allocated with
82 * av_malloc(z)() or av_realloc() or NULL.
83 * @return Pointer to a newly reallocated block or NULL if the block
84 * cannot be reallocated or the function is used to free the memory block.
85 * @see av_fast_realloc()
86 */
87void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2);
88
89/**
90 * Free a memory block which has been allocated with av_malloc(z)() or
91 * av_realloc().
92 * @param ptr Pointer to the memory block which should be freed.
93 * @note ptr = NULL is explicitly allowed.
94 * @note It is recommended that you use av_freep() instead.
95 * @see av_freep()
96 */
97void av_free(void *ptr);
98
99/**
100 * Allocate a block of size bytes with alignment suitable for all
101 * memory accesses (including vectors if available on the CPU) and
102 * zero all the bytes of the block.
103 * @param size Size in bytes for the memory block to be allocated.
104 * @return Pointer to the allocated block, NULL if it cannot be allocated.
105 * @see av_malloc()
106 */
107void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1);
108
109/**
110 * Duplicate the string s.
111 * @param s string to be duplicated
112 * @return Pointer to a newly allocated string containing a
113 * copy of s or NULL if the string cannot be allocated.
114 */
115char *av_strdup(const char *s) av_malloc_attrib;
116
117/**
118 * Free a memory block which has been allocated with av_malloc(z)() or
119 * av_realloc() and set the pointer pointing to it to NULL.
120 * @param ptr Pointer to the pointer to the memory block which should
121 * be freed.
122 * @see av_free()
123 */
124void av_freep(void *ptr);
125
126#endif /* AVUTIL_MEM_H */