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view libavutil/mem.h @ 2:897f711a7157
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| author | Nina Engelhardt <nengel@mailbox.tu-berlin.de> |
|---|---|
| date | Tue, 25 Sep 2012 15:55:33 +0200 |
| parents | |
| children |
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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 */
21 /**
22 * @file
23 * memory handling functions
24 */
26 #ifndef AVUTIL_MEM_H
27 #define AVUTIL_MEM_H
29 #include "attributes.h"
30 #include "config.h"
32 #define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
33 #define DECLARE_ALIGNED_16(t,v) t __attribute__ ((aligned (16))) v
34 #define DECLARE_ASM_CONST(n,t,v) static const t __attribute__((used)) __attribute__ ((aligned (n))) v
36 #if AV_GCC_VERSION_AT_LEAST(3,1)
37 #define av_malloc_attrib __attribute__((__malloc__))
38 #else
39 #define av_malloc_attrib
40 #endif
42 /**
43 * Allocates a block of size bytes with alignment suitable for all
44 * memory accesses (including vectors if available on the CPU).
45 * @param size Size in bytes for the memory block to be allocated.
46 * @return Pointer to the allocated block, NULL if the block cannot
47 * be allocated.
48 * @see av_mallocz()
49 */
50 void *av_malloc(unsigned int size) av_malloc_attrib;
52 /**
53 * Allocates or reallocates a block of memory.
54 * If ptr is NULL and size > 0, allocates a new block. If
55 * size is zero, frees the memory block pointed to by ptr.
56 * @param size Size in bytes for the memory block to be allocated or
57 * reallocated.
58 * @param ptr Pointer to a memory block already allocated with
59 * av_malloc(z)() or av_realloc() or NULL.
60 * @return Pointer to a newly reallocated block or NULL if the block
61 * cannot be reallocated or the function is used to free the memory block.
62 * @see av_fast_realloc()
63 */
64 void *av_realloc(void *ptr, unsigned int size);
66 /**
67 * Reallocates the given block if it is not large enough, otherwise it
68 * does nothing.
69 *
70 * @see av_realloc
71 */
72 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
74 /**
75 * Allocates a buffer, reusing the given one if large enough.
76 *
77 * Contrary to av_fast_realloc the current buffer contents might not be
78 * preserved and on error the old buffer is freed, thus no special
79 * handling to avoid memleaks is necessary.
80 *
81 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
82 * @param size size of the buffer *ptr points to
83 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
84 * *size 0 if an error occurred.
85 */
86 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
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 */
97 void av_free(void *ptr);
99 /**
100 * Allocates a block of size bytes with alignment suitable for all
101 * memory accesses (including vectors if available on the CPU) and
102 * zeroes 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 */
107 void *av_mallocz(unsigned int size) av_malloc_attrib;
109 /**
110 * Duplicates 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 */
115 char *av_strdup(const char *s) av_malloc_attrib;
117 /**
118 * Frees 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 */
124 void av_freep(void *ptr);
127 static av_always_inline uint32_t pack16to32(int a, int b){
128 #if HAVE_BIGENDIAN
129 return (b&0xFFFF) + (a<<16);
130 #else
131 return (a&0xFFFF) + (b<<16);
132 #endif
133 }
135 static av_always_inline uint16_t pack8to16(int a, int b){
136 #if HAVE_BIGENDIAN
137 return (b&0xFF) + (a<<8);
138 #else
139 return (a&0xFF) + (b<<8);
140 #endif
141 }
143 #endif /* AVUTIL_MEM_H */