put memory functions in a separate file so that the user can redefinite them without...

[libav.git] / libavcodec / mem.c

/*
 * 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
 */
#include "avcodec.h"
#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 alloc */
void *av_malloc(int size)
{
    void *ptr;
#if defined ( ARCH_X86 ) && defined ( HAVE_MEMALIGN ) && 0
    ptr = memalign(64,size);
    /* Why 64? 
       Indeed, we should align it:
         on 4 for 386
         on 16 for 486
	 on 32 for 586, PPro - k6-III
	 on 64 for K7 (maybe for P3 too).
       Because L1 and L2 caches are aligned on those values.
       But I don't want to code such logic here!
     */
#else
    ptr = malloc(size);
#endif
    if (!ptr)
        return NULL;
    /* NOTE: this memset should not be present */
    memset(ptr, 0, size);
    return ptr;
}

/* 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);
}