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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 libavutil/mem.h
23 * memory handling functions
24 */
25
26#ifndef AVUTIL_MEM_H
27#define AVUTIL_MEM_H
28
29#include "attributes.h"
30
31#if defined(__ICC) || defined(__SUNPRO_C)
32 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
33 #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
34#elif defined(__TI_COMPILER_VERSION__)
35 #define DECLARE_ALIGNED(n,t,v) \
36 AV_PRAGMA(DATA_ALIGN(v,n)) \
37 t __attribute__((aligned(n))) v
38 #define DECLARE_ASM_CONST(n,t,v) \
39 AV_PRAGMA(DATA_ALIGN(v,n)) \
40 static const t __attribute__((aligned(n))) v
41#elif defined(__GNUC__)
42 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
43 #define DECLARE_ASM_CONST(n,t,v) static const t attribute_used __attribute__ ((aligned (n))) v
44#elif defined(_MSC_VER)
45 #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
46 #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
47#else
48 #define DECLARE_ALIGNED(n,t,v) t v
49 #define DECLARE_ASM_CONST(n,t,v) static const t v
50#endif
51
52#if AV_GCC_VERSION_AT_LEAST(3,1)
53 #define av_malloc_attrib __attribute__((__malloc__))
54#else
55 #define av_malloc_attrib
56#endif
57
58#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
59 #define av_alloc_size(n) __attribute__((alloc_size(n)))
60#else
61 #define av_alloc_size(n)
62#endif
63
64/**
65 * Allocates a block of size bytes with alignment suitable for all
66 * memory accesses (including vectors if available on the CPU).
67 * @param size Size in bytes for the memory block to be allocated.
68 * @return Pointer to the allocated block, NULL if the block cannot
69 * be allocated.
70 * @see av_mallocz()
71 */
72void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1);
73
74/**
75 * Allocates or reallocates a block of memory.
76 * If ptr is NULL and size > 0, allocates a new block. If
77 * size is zero, frees the memory block pointed to by ptr.
78 * @param size Size in bytes for the memory block to be allocated or
79 * reallocated.
80 * @param ptr Pointer to a memory block already allocated with
81 * av_malloc(z)() or av_realloc() or NULL.
82 * @return Pointer to a newly reallocated block or NULL if the block
83 * cannot be reallocated or the function is used to free the memory block.
84 * @see av_fast_realloc()
85 */
86void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2);
87
88/**
89 * Frees a memory block which has been allocated with av_malloc(z)() or
90 * av_realloc().
91 * @param ptr Pointer to the memory block which should be freed.
92 * @note ptr = NULL is explicitly allowed.
93 * @note It is recommended that you use av_freep() instead.
94 * @see av_freep()
95 */
96void av_free(void *ptr);
97
98/**
99 * Allocates a block of size bytes with alignment suitable for all
100 * memory accesses (including vectors if available on the CPU) and
101 * zeroes all the bytes of the block.
102 * @param size Size in bytes for the memory block to be allocated.
103 * @return Pointer to the allocated block, NULL if it cannot be allocated.
104 * @see av_malloc()
105 */
106void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1);
107
108/**
109 * Duplicates the string s.
110 * @param s string to be duplicated
111 * @return Pointer to a newly allocated string containing a
112 * copy of s or NULL if the string cannot be allocated.
113 */
114char *av_strdup(const char *s) av_malloc_attrib;
115
116/**
117 * Frees a memory block which has been allocated with av_malloc(z)() or
118 * av_realloc() and set the pointer pointing to it to NULL.
119 * @param ptr Pointer to the pointer to the memory block which should
120 * be freed.
121 * @see av_free()
122 */
123void av_freep(void *ptr);
124
125#endif /* AVUTIL_MEM_H */