2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
23 * memory handling functions
29 #include "attributes.h"
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
48 #define DECLARE_ALIGNED(n,t,v) t v
49 #define DECLARE_ASM_CONST(n,t,v) static const t v
52 #if AV_GCC_VERSION_AT_LEAST(3,1)
53 #define av_malloc_attrib __attribute__((__malloc__))
55 #define av_malloc_attrib
58 #if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
59 #define av_alloc_size(n) __attribute__((alloc_size(n)))
61 #define av_alloc_size(n)
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
72 void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1);
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
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()
86 void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2);
89 * Frees a memory block which has been allocated with av_malloc(z)() or
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.
96 void av_free(void *ptr);
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.
106 void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1);
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.
114 char *av_strdup(const char *s) av_malloc_attrib;
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
123 void av_freep(void *ptr);
125 #endif /* AVUTIL_MEM_H */