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https://github.com/FFmpeg/FFmpeg.git
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34e52abb62
This compiler supports gcc-style alignment attributes for struct, but not for global variables. For the latter, alignment can be specified with a pragma, which does not work for struct members or local variables. By using both pragma and attribute, one or the other will always take effect. Unfortunately, no means exists for aligning stack variables. Originally committed as revision 21379 to svn://svn.ffmpeg.org/ffmpeg/trunk
127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavutil/mem.h
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* memory handling functions
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*/
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#ifndef AVUTIL_MEM_H
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#define AVUTIL_MEM_H
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#include "common.h"
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#if defined(__ICC) || defined(__SUNPRO_C)
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#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
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#elif defined(__TI_COMPILER_VERSION__)
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#define DECLARE_ALIGNED(n,t,v) \
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AV_PRAGMA(DATA_ALIGN(v,n)) \
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t __attribute__((aligned(n))) v
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#define DECLARE_ASM_CONST(n,t,v) \
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AV_PRAGMA(DATA_ALIGN(v,n)) \
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static const t __attribute__((aligned(n))) v
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#elif defined(__GNUC__)
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#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
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#define DECLARE_ASM_CONST(n,t,v) static const t attribute_used __attribute__ ((aligned (n))) v
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#elif defined(_MSC_VER)
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#define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
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#define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
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#else
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#define DECLARE_ALIGNED(n,t,v) t v
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#define DECLARE_ASM_CONST(n,t,v) static const t v
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#endif
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#define av_malloc_attrib __attribute__((__malloc__))
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#else
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#define av_malloc_attrib
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#endif
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#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
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#define av_alloc_size(n) __attribute__((alloc_size(n)))
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#else
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#define av_alloc_size(n)
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#endif
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/**
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* Allocates a block of size bytes with alignment suitable for all
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* memory accesses (including vectors if available on the CPU).
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* @param size Size in bytes for the memory block to be allocated.
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* @return Pointer to the allocated block, NULL if the block cannot
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* be allocated.
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* @see av_mallocz()
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*/
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void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1);
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/**
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* Allocates or reallocates a block of memory.
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* If ptr is NULL and size > 0, allocates a new block. If
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* size is zero, frees the memory block pointed to by ptr.
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* @param size Size in bytes for the memory block to be allocated or
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* reallocated.
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* @param ptr Pointer to a memory block already allocated with
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* av_malloc(z)() or av_realloc() or NULL.
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* @return Pointer to a newly reallocated block or NULL if the block
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* cannot be reallocated or the function is used to free the memory block.
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* @see av_fast_realloc()
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*/
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void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2);
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/**
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* Frees a memory block which has been allocated with av_malloc(z)() or
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* av_realloc().
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* @param ptr Pointer to the memory block which should be freed.
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* @note ptr = NULL is explicitly allowed.
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* @note It is recommended that you use av_freep() instead.
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* @see av_freep()
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*/
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void av_free(void *ptr);
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/**
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* Allocates a block of size bytes with alignment suitable for all
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* memory accesses (including vectors if available on the CPU) and
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* zeroes all the bytes of the block.
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* @param size Size in bytes for the memory block to be allocated.
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* @return Pointer to the allocated block, NULL if it cannot be allocated.
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* @see av_malloc()
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*/
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void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1);
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/**
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* Duplicates the string s.
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* @param s string to be duplicated
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* @return Pointer to a newly allocated string containing a
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* copy of s or NULL if the string cannot be allocated.
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*/
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char *av_strdup(const char *s) av_malloc_attrib;
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/**
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* Frees a memory block which has been allocated with av_malloc(z)() or
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* av_realloc() and set the pointer pointing to it to NULL.
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* @param ptr Pointer to the pointer to the memory block which should
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* be freed.
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* @see av_free()
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*/
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void av_freep(void *ptr);
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#endif /* AVUTIL_MEM_H */
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