mem.c

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/*
 * default memory allocator for libavcodec
 * Copyright (c) 2002 Fabrice Bellard.
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
/**
 * @file mem.c
 * default memory allocator for libavcodec.
 */
 
#include "avcodec.h"

/* here we can use OS dependant allocation functions */
#undef malloc
#undef free
#undef realloc

#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif

/* you can redefine av_malloc and av_free in your project to use your
   memory allocator. You do not need to suppress this file because the
   linker will do it automatically */

/** 
 * Memory allocation of size byte with alignment suitable for all
 * memory accesses (including vectors if available on the
 * CPU). av_malloc(0) must return a non NULL pointer.
 */
void *av_malloc(unsigned int size)
{
    void *ptr;
    
    ptr = malloc(size);

    return ptr;
}

/**
 * av_realloc semantics (same as glibc): if ptr is NULL and size > 0,
 * identical to malloc(size). If size is zero, it is identical to
 * free(ptr) and NULL is returned.  
 */
void *av_realloc(void *ptr, unsigned int size)
{
    return realloc(ptr, size);
}

/* NOTE: ptr = NULL is explicetly allowed */
void av_free(void *ptr)
{
    /* XXX: this test should not be needed on most libcs */
    if (ptr)
	{
        free(ptr);
	}
}