mirror of
https://github.com/xenia-project/FFmpeg.git
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a39bd458a0
This patch is based on a patch by John Stebbins Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
203 lines
5.0 KiB
C
203 lines
5.0 KiB
C
/*
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* default memory allocator for libavutil
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* Copyright (c) 2002 Fabrice Bellard
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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
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* default memory allocator for libavutil
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*/
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#define _XOPEN_SOURCE 600
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#include "config.h"
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#if HAVE_MALLOC_H
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#include <malloc.h>
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#endif
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#include "avutil.h"
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#include "mem.h"
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/* here we can use OS-dependent allocation functions */
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#undef free
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#undef malloc
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#undef realloc
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#ifdef MALLOC_PREFIX
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#define malloc AV_JOIN(MALLOC_PREFIX, malloc)
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#define memalign AV_JOIN(MALLOC_PREFIX, memalign)
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#define posix_memalign AV_JOIN(MALLOC_PREFIX, posix_memalign)
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#define realloc AV_JOIN(MALLOC_PREFIX, realloc)
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#define free AV_JOIN(MALLOC_PREFIX, free)
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void *malloc(size_t size);
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void *memalign(size_t align, size_t size);
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int posix_memalign(void **ptr, size_t align, size_t size);
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void *realloc(void *ptr, size_t size);
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void free(void *ptr);
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#endif /* MALLOC_PREFIX */
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#define ALIGN (HAVE_AVX ? 32 : 16)
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/* You can redefine av_malloc and av_free in your project to use your
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memory allocator. You do not need to suppress this file because the
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linker will do it automatically. */
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#define MAX_MALLOC_SIZE INT_MAX
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void *av_malloc(size_t size)
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{
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void *ptr = NULL;
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#if CONFIG_MEMALIGN_HACK
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long diff;
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#endif
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/* let's disallow possible ambiguous cases */
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if (size > (MAX_MALLOC_SIZE-32))
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return NULL;
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#if CONFIG_MEMALIGN_HACK
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ptr = malloc(size+ALIGN);
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if(!ptr)
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return ptr;
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diff= ((-(long)ptr - 1)&(ALIGN-1)) + 1;
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ptr = (char*)ptr + diff;
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((char*)ptr)[-1]= diff;
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#elif HAVE_POSIX_MEMALIGN
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if (size) //OSX on SDK 10.6 has a broken posix_memalign implementation
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if (posix_memalign(&ptr,ALIGN,size))
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ptr = NULL;
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#elif HAVE_MEMALIGN
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ptr = memalign(ALIGN,size);
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/* Why 64?
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Indeed, we should align it:
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on 4 for 386
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on 16 for 486
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on 32 for 586, PPro - K6-III
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on 64 for K7 (maybe for P3 too).
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Because L1 and L2 caches are aligned on those values.
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But I don't want to code such logic here!
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*/
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/* Why 32?
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For AVX ASM. SSE / NEON needs only 16.
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Why not larger? Because I did not see a difference in benchmarks ...
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*/
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/* benchmarks with P3
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memalign(64)+1 3071,3051,3032
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memalign(64)+2 3051,3032,3041
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memalign(64)+4 2911,2896,2915
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memalign(64)+8 2545,2554,2550
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memalign(64)+16 2543,2572,2563
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memalign(64)+32 2546,2545,2571
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memalign(64)+64 2570,2533,2558
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BTW, malloc seems to do 8-byte alignment by default here.
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*/
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#else
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ptr = malloc(size);
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#endif
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if(!ptr && !size)
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ptr= av_malloc(1);
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return ptr;
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}
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void *av_realloc(void *ptr, size_t size)
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{
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#if CONFIG_MEMALIGN_HACK
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int diff;
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#endif
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/* let's disallow possible ambiguous cases */
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if (size > (MAX_MALLOC_SIZE-16))
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return NULL;
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#if CONFIG_MEMALIGN_HACK
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//FIXME this isn't aligned correctly, though it probably isn't needed
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if(!ptr) return av_malloc(size);
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diff= ((char*)ptr)[-1];
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return (char*)realloc((char*)ptr - diff, size + diff) + diff;
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#else
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return realloc(ptr, size + !size);
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#endif
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}
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void av_free(void *ptr)
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{
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#if CONFIG_MEMALIGN_HACK
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if (ptr)
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free((char*)ptr - ((char*)ptr)[-1]);
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#else
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free(ptr);
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#endif
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}
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void av_freep(void *arg)
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{
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void **ptr= (void**)arg;
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av_free(*ptr);
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*ptr = NULL;
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}
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void *av_mallocz(size_t size)
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{
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void *ptr = av_malloc(size);
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if (ptr)
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memset(ptr, 0, size);
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return ptr;
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}
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char *av_strdup(const char *s)
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{
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char *ptr= NULL;
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if(s){
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int len = strlen(s) + 1;
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ptr = av_malloc(len);
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if (ptr)
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memcpy(ptr, s, len);
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}
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return ptr;
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}
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/* add one element to a dynamic array */
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void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem)
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{
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/* see similar ffmpeg.c:grow_array() */
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int nb, nb_alloc;
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intptr_t *tab;
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nb = *nb_ptr;
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tab = *(intptr_t**)tab_ptr;
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if ((nb & (nb - 1)) == 0) {
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if (nb == 0)
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nb_alloc = 1;
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else
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nb_alloc = nb * 2;
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tab = av_realloc(tab, nb_alloc * sizeof(intptr_t));
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*(intptr_t**)tab_ptr = tab;
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}
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tab[nb++] = (intptr_t)elem;
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*nb_ptr = nb;
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}
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