www.pudn.com > ffmpeg-Sdk.rar > mem.h

/* 
 * copyright (c) 2006 Michael Niedermayer  
 * 
 * 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 FFMPEG_MEM_H 
#define FFMPEG_MEM_H 
 
#ifdef __ICC 
  #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 __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 _MSVC 
  #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 
#else 
  //#warning No align and asm directives, this might fail. 
  #define DECLARE_ALIGNED(n,t,v)      t v 
  #define DECLARE_ASM_CONST(n,t,v)    static const t v 
#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); 
 
/** 
 * 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); 
 
/** 
 * 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); 
 
/** 
 * 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); 
 
/** 
 * 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 /* FFMPEG_MEM_H */