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Diffstat (limited to 'contrib/ffmpeg/libavutil/mem.c')
| -rw-r--r-- | contrib/ffmpeg/libavutil/mem.c | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/contrib/ffmpeg/libavutil/mem.c b/contrib/ffmpeg/libavutil/mem.c deleted file mode 100644 index a91ac4a07..000000000 --- a/contrib/ffmpeg/libavutil/mem.c +++ /dev/null @@ -1,152 +0,0 @@ -/* - * default memory allocator for libavutil - * Copyright (c) 2002 Fabrice Bellard. - * - * 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.c - * default memory allocator for libavutil. - */ - -#include "common.h" - -/* here we can use OS dependent 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 */ - -void *av_malloc(unsigned int size) -{ - void *ptr; -#ifdef CONFIG_MEMALIGN_HACK - long diff; -#endif - - /* let's disallow possible ambiguous cases */ - if(size > (INT_MAX-16) ) - return NULL; - -#ifdef CONFIG_MEMALIGN_HACK - ptr = malloc(size+16); - if(!ptr) - return ptr; - diff= ((-(long)ptr - 1)&15) + 1; - ptr += diff; - ((char*)ptr)[-1]= diff; -#elif defined (HAVE_MEMALIGN) - ptr = memalign(16,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! - */ - /* Why 16? - because some cpus need alignment, for example SSE2 on P4, & most RISC cpus - it will just trigger an exception and the unaligned load will be done in the - exception handler or it will just segfault (SSE2 on P4) - Why not larger? because i didnt see a difference in benchmarks ... - */ - /* benchmarks with p3 - memalign(64)+1 3071,3051,3032 - memalign(64)+2 3051,3032,3041 - memalign(64)+4 2911,2896,2915 - memalign(64)+8 2545,2554,2550 - memalign(64)+16 2543,2572,2563 - memalign(64)+32 2546,2545,2571 - memalign(64)+64 2570,2533,2558 - - btw, malloc seems to do 8 byte alignment by default here - */ -#else - ptr = malloc(size); -#endif - return ptr; -} - -void *av_realloc(void *ptr, unsigned int size) -{ -#ifdef CONFIG_MEMALIGN_HACK - int diff; -#endif - - /* let's disallow possible ambiguous cases */ - if(size > (INT_MAX-16) ) - return NULL; - -#ifdef CONFIG_MEMALIGN_HACK - //FIXME this isn't aligned correctly, though it probably isn't needed - if(!ptr) return av_malloc(size); - diff= ((char*)ptr)[-1]; - return realloc(ptr - diff, size + diff) + diff; -#else - return realloc(ptr, size); -#endif -} - -void av_free(void *ptr) -{ - /* XXX: this test should not be needed on most libcs */ - if (ptr) -#ifdef CONFIG_MEMALIGN_HACK - free(ptr - ((char*)ptr)[-1]); -#else - free(ptr); -#endif -} - -void av_freep(void *arg) -{ - void **ptr= (void**)arg; - av_free(*ptr); - *ptr = NULL; -} - -void *av_mallocz(unsigned int size) -{ - void *ptr; - - ptr = av_malloc(size); - if (ptr) - memset(ptr, 0, size); - return ptr; -} - -char *av_strdup(const char *s) -{ - char *ptr; - int len; - len = strlen(s) + 1; - ptr = av_malloc(len); - if (ptr) - memcpy(ptr, s, len); - return ptr; -} - |