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Diffstat (limited to 'ffmpeg1/libavutil/mem.c')
| -rw-r--r-- | ffmpeg1/libavutil/mem.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/ffmpeg1/libavutil/mem.c b/ffmpeg1/libavutil/mem.c new file mode 100644 index 0000000..860c011 --- /dev/null +++ b/ffmpeg1/libavutil/mem.c @@ -0,0 +1,376 @@ +/* + * 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 + * default memory allocator for libavutil + */ + +#define _XOPEN_SOURCE 600 + +#include "config.h" + +#include <limits.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#if HAVE_MALLOC_H +#include <malloc.h> +#endif + +#include "avassert.h" +#include "avutil.h" +#include "intreadwrite.h" +#include "mem.h" + +#ifdef MALLOC_PREFIX + +#define malloc AV_JOIN(MALLOC_PREFIX, malloc) +#define memalign AV_JOIN(MALLOC_PREFIX, memalign) +#define posix_memalign AV_JOIN(MALLOC_PREFIX, posix_memalign) +#define realloc AV_JOIN(MALLOC_PREFIX, realloc) +#define free AV_JOIN(MALLOC_PREFIX, free) + +void *malloc(size_t size); +void *memalign(size_t align, size_t size); +int posix_memalign(void **ptr, size_t align, size_t size); +void *realloc(void *ptr, size_t size); +void free(void *ptr); + +#endif /* MALLOC_PREFIX */ + +#define ALIGN (HAVE_AVX ? 32 : 16) + +/* NOTE: if you want to override these functions with your own + * implementations (not recommended) you have to link libav* as + * dynamic libraries and remove -Wl,-Bsymbolic from the linker flags. + * Note that this will cost performance. */ + +static size_t max_alloc_size= INT_MAX; + +void av_max_alloc(size_t max){ + max_alloc_size = max; +} + +void *av_malloc(size_t size) +{ + void *ptr = NULL; +#if CONFIG_MEMALIGN_HACK + long diff; +#endif + + /* let's disallow possible ambiguous cases */ + if (size > (max_alloc_size - 32)) + return NULL; + +#if CONFIG_MEMALIGN_HACK + ptr = malloc(size + ALIGN); + if (!ptr) + return ptr; + diff = ((~(long)ptr)&(ALIGN - 1)) + 1; + ptr = (char *)ptr + diff; + ((char *)ptr)[-1] = diff; +#elif HAVE_POSIX_MEMALIGN + if (size) //OS X on SDK 10.6 has a broken posix_memalign implementation + if (posix_memalign(&ptr, ALIGN, size)) + ptr = NULL; +#elif HAVE_ALIGNED_MALLOC + ptr = _aligned_malloc(size, ALIGN); +#elif HAVE_MEMALIGN +#ifndef __DJGPP__ + ptr = memalign(ALIGN, size); +#else + ptr = memalign(size, ALIGN); +#endif + /* 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 32? + * For AVX ASM. SSE / NEON needs only 16. + * Why not larger? Because I did not 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 + if(!ptr && !size) { + size = 1; + ptr= av_malloc(1); + } +#if CONFIG_MEMORY_POISONING + if (ptr) + memset(ptr, 0x2a, size); +#endif + return ptr; +} + +void *av_realloc(void *ptr, size_t size) +{ +#if CONFIG_MEMALIGN_HACK + int diff; +#endif + + /* let's disallow possible ambiguous cases */ + if (size > (max_alloc_size - 32)) + return NULL; + +#if 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]; + av_assert0(diff>0 && diff<=ALIGN); + ptr = realloc((char *)ptr - diff, size + diff); + if (ptr) + ptr = (char *)ptr + diff; + return ptr; +#elif HAVE_ALIGNED_MALLOC + return _aligned_realloc(ptr, size + !size, ALIGN); +#else + return realloc(ptr, size + !size); +#endif +} + +void *av_realloc_f(void *ptr, size_t nelem, size_t elsize) +{ + size_t size; + void *r; + + if (av_size_mult(elsize, nelem, &size)) { + av_free(ptr); + return NULL; + } + r = av_realloc(ptr, size); + if (!r && size) + av_free(ptr); + return r; +} + +void av_free(void *ptr) +{ +#if CONFIG_MEMALIGN_HACK + if (ptr) { + int v= ((char *)ptr)[-1]; + av_assert0(v>0 && v<=ALIGN); + free((char *)ptr - v); + } +#elif HAVE_ALIGNED_MALLOC + _aligned_free(ptr); +#else + free(ptr); +#endif +} + +void av_freep(void *arg) +{ + void **ptr = (void **)arg; + av_free(*ptr); + *ptr = NULL; +} + +void *av_mallocz(size_t size) +{ + void *ptr = av_malloc(size); + if (ptr) + memset(ptr, 0, size); + return ptr; +} + +void *av_calloc(size_t nmemb, size_t size) +{ + if (size <= 0 || nmemb >= INT_MAX / size) + return NULL; + return av_mallocz(nmemb * size); +} + +char *av_strdup(const char *s) +{ + char *ptr = NULL; + if (s) { + int len = strlen(s) + 1; + ptr = av_malloc(len); + if (ptr) + memcpy(ptr, s, len); + } + return ptr; +} + +/* add one element to a dynamic array */ +void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem) +{ + /* see similar ffmpeg.c:grow_array() */ + int nb, nb_alloc; + intptr_t *tab; + + nb = *nb_ptr; + tab = *(intptr_t**)tab_ptr; + if ((nb & (nb - 1)) == 0) { + if (nb == 0) + nb_alloc = 1; + else + nb_alloc = nb * 2; + tab = av_realloc(tab, nb_alloc * sizeof(intptr_t)); + *(intptr_t**)tab_ptr = tab; + } + tab[nb++] = (intptr_t)elem; + *nb_ptr = nb; +} + +static void fill16(uint8_t *dst, int len) +{ + uint32_t v = AV_RN16(dst - 2); + + v |= v << 16; + + while (len >= 4) { + AV_WN32(dst, v); + dst += 4; + len -= 4; + } + + while (len--) { + *dst = dst[-2]; + dst++; + } +} + +static void fill24(uint8_t *dst, int len) +{ +#if HAVE_BIGENDIAN + uint32_t v = AV_RB24(dst - 3); + uint32_t a = v << 8 | v >> 16; + uint32_t b = v << 16 | v >> 8; + uint32_t c = v << 24 | v; +#else + uint32_t v = AV_RL24(dst - 3); + uint32_t a = v | v << 24; + uint32_t b = v >> 8 | v << 16; + uint32_t c = v >> 16 | v << 8; +#endif + + while (len >= 12) { + AV_WN32(dst, a); + AV_WN32(dst + 4, b); + AV_WN32(dst + 8, c); + dst += 12; + len -= 12; + } + + if (len >= 4) { + AV_WN32(dst, a); + dst += 4; + len -= 4; + } + + if (len >= 4) { + AV_WN32(dst, b); + dst += 4; + len -= 4; + } + + while (len--) { + *dst = dst[-3]; + dst++; + } +} + +static void fill32(uint8_t *dst, int len) +{ + uint32_t v = AV_RN32(dst - 4); + + while (len >= 4) { + AV_WN32(dst, v); + dst += 4; + len -= 4; + } + + while (len--) { + *dst = dst[-4]; + dst++; + } +} + +void av_memcpy_backptr(uint8_t *dst, int back, int cnt) +{ + const uint8_t *src = &dst[-back]; + if (!back) + return; + + if (back == 1) { + memset(dst, *src, cnt); + } else if (back == 2) { + fill16(dst, cnt); + } else if (back == 3) { + fill24(dst, cnt); + } else if (back == 4) { + fill32(dst, cnt); + } else { + if (cnt >= 16) { + int blocklen = back; + while (cnt > blocklen) { + memcpy(dst, src, blocklen); + dst += blocklen; + cnt -= blocklen; + blocklen <<= 1; + } + memcpy(dst, src, cnt); + return; + } + if (cnt >= 8) { + AV_COPY32U(dst, src); + AV_COPY32U(dst + 4, src + 4); + src += 8; + dst += 8; + cnt -= 8; + } + if (cnt >= 4) { + AV_COPY32U(dst, src); + src += 4; + dst += 4; + cnt -= 4; + } + if (cnt >= 2) { + AV_COPY16U(dst, src); + src += 2; + dst += 2; + cnt -= 2; + } + if (cnt) + *dst = *src; + } +} + |