mirror of https://git.ffmpeg.org/ffmpeg.git
120 lines
4.2 KiB
C
120 lines
4.2 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 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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#ifdef __ICC
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#define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
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#define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
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#elif defined(__GNUC__)
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#define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
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#define DECLARE_ASM_CONST(n,t,v) static const t v attribute_used __attribute__ ((aligned (n)))
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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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#elif defined(HAVE_INLINE_ASM)
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#error The asm code needs alignment, but we do not know how to do it for this compiler.
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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 defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
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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(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ > 2)
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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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* Allocate a block of \p 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 it cannot allocate
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* it.
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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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* Allocate or reallocate a block of memory.
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* If \p ptr is NULL and \p size > 0, allocate a new block. If \p
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* size is zero, free the memory block pointed by \p 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 it cannot
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* reallocate 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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* Free 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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* Allocate a block of \p 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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* set to 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 allocate
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* it.
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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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* Duplicate the string \p 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 \p s or NULL if it 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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* Free a memory block which has been allocated with av_malloc(z)() or
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* av_realloc() and set to NULL the pointer to it.
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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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