mem.h
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上传日期:2022-07-11
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- /*
- * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file mem.h
- * Memory handling functions.
- */
- #ifndef AVUTIL_MEM_H
- #define AVUTIL_MEM_H
- #include "common.h"
- #if defined(__ICC) || defined(__SUNPRO_C)
- #define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
- #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
- #elif defined(__GNUC__)
- #define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
- #define DECLARE_ASM_CONST(n,t,v) static const t v attribute_used __attribute__ ((aligned (n)))
- #elif defined(_MSC_VER)
- #define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
- #define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
- #elif defined(HAVE_INLINE_ASM)
- #error The asm code needs alignment, but we do not know how to do it for this compiler.
- #else
- #define DECLARE_ALIGNED(n,t,v) t v
- #define DECLARE_ASM_CONST(n,t,v) static const t v
- #endif
- #if AV_GCC_VERSION_AT_LEAST(3,1)
- #define av_malloc_attrib __attribute__((__malloc__))
- #else
- #define av_malloc_attrib
- #endif
- #if (!defined(__ICC) || __ICC > 1100) && AV_GCC_VERSION_AT_LEAST(4,3)
- #define av_alloc_size(n) __attribute__((alloc_size(n)))
- #else
- #define av_alloc_size(n)
- #endif
- /**
- * Allocate a block of p size bytes with alignment suitable for all
- * memory accesses (including vectors if available on the CPU).
- * @param size Size in bytes for the memory block to be allocated.
- * @return Pointer to the allocated block, NULL if it cannot allocate
- * it.
- * @see av_mallocz()
- */
- void *av_malloc(unsigned int size) av_malloc_attrib av_alloc_size(1);
- /**
- * Allocate or reallocate a block of memory.
- * If p ptr is NULL and p size > 0, allocate a new block. If p
- * size is zero, free the memory block pointed by p ptr.
- * @param size Size in bytes for the memory block to be allocated or
- * reallocated.
- * @param ptr Pointer to a memory block already allocated with
- * av_malloc(z)() or av_realloc() or NULL.
- * @return Pointer to a newly reallocated block or NULL if it cannot
- * reallocate or the function is used to free the memory block.
- * @see av_fast_realloc()
- */
- void *av_realloc(void *ptr, unsigned int size) av_alloc_size(2);
- /**
- * Free a memory block which has been allocated with av_malloc(z)() or
- * av_realloc().
- * @param ptr Pointer to the memory block which should be freed.
- * @note ptr = NULL is explicitly allowed.
- * @note It is recommended that you use av_freep() instead.
- * @see av_freep()
- */
- void av_free(void *ptr);
- /**
- * Allocate a block of p size bytes with alignment suitable for all
- * memory accesses (including vectors if available on the CPU) and
- * set to zeroes all the bytes of the block.
- * @param size Size in bytes for the memory block to be allocated.
- * @return Pointer to the allocated block, NULL if it cannot allocate
- * it.
- * @see av_malloc()
- */
- void *av_mallocz(unsigned int size) av_malloc_attrib av_alloc_size(1);
- /**
- * Duplicate the string p s.
- * @param s String to be duplicated.
- * @return Pointer to a newly allocated string containing a
- * copy of p s or NULL if it cannot be allocated.
- */
- char *av_strdup(const char *s) av_malloc_attrib;
- /**
- * Free a memory block which has been allocated with av_malloc(z)() or
- * av_realloc() and set to NULL the pointer to it.
- * @param ptr Pointer to the pointer to the memory block which should
- * be freed.
- * @see av_free()
- */
- void av_freep(void *ptr);
- #endif /* AVUTIL_MEM_H */