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-rw-r--r--media/ffvpx/libavutil/mem.c578
1 files changed, 578 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/mem.c b/media/ffvpx/libavutil/mem.c
new file mode 100644
index 0000000000..18aff5291f
--- /dev/null
+++ b/media/ffvpx/libavutil/mem.c
@@ -0,0 +1,578 @@
+/*
+ * 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 <stdatomic.h>
+#include <string.h>
+#if HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+
+#include "attributes.h"
+#include "avassert.h"
+#include "dynarray.h"
+#include "error.h"
+#include "internal.h"
+#include "intreadwrite.h"
+#include "macros.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_AVX512 ? 64 : (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 atomic_size_t max_alloc_size = ATOMIC_VAR_INIT(INT_MAX);
+
+void av_max_alloc(size_t max){
+ atomic_store_explicit(&max_alloc_size, max, memory_order_relaxed);
+}
+
+static int size_mult(size_t a, size_t b, size_t *r)
+{
+ size_t t;
+
+#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_mul_overflow)
+ if (__builtin_mul_overflow(a, b, &t))
+ return AVERROR(EINVAL);
+#else
+ t = a * b;
+ /* Hack inspired from glibc: don't try the division if nelem and elsize
+ * are both less than sqrt(SIZE_MAX). */
+ if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b)
+ return AVERROR(EINVAL);
+#endif
+ *r = t;
+ return 0;
+}
+
+void *av_malloc(size_t size)
+{
+ void *ptr = NULL;
+
+ if (size > atomic_load_explicit(&max_alloc_size, memory_order_relaxed))
+ return NULL;
+
+#if 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, FF_MEMORY_POISON, size);
+#endif
+ return ptr;
+}
+
+void *av_realloc(void *ptr, size_t size)
+{
+ void *ret;
+ if (size > atomic_load_explicit(&max_alloc_size, memory_order_relaxed))
+ return NULL;
+
+#if HAVE_ALIGNED_MALLOC
+ ret = _aligned_realloc(ptr, size + !size, ALIGN);
+#else
+ ret = realloc(ptr, size + !size);
+#endif
+#if CONFIG_MEMORY_POISONING
+ if (ret && !ptr)
+ memset(ret, FF_MEMORY_POISON, size);
+#endif
+ return ret;
+}
+
+void *av_realloc_f(void *ptr, size_t nelem, size_t elsize)
+{
+ size_t size;
+ void *r;
+
+ if (size_mult(elsize, nelem, &size)) {
+ av_free(ptr);
+ return NULL;
+ }
+ r = av_realloc(ptr, size);
+ if (!r)
+ av_free(ptr);
+ return r;
+}
+
+int av_reallocp(void *ptr, size_t size)
+{
+ void *val;
+
+ if (!size) {
+ av_freep(ptr);
+ return 0;
+ }
+
+ memcpy(&val, ptr, sizeof(val));
+ val = av_realloc(val, size);
+
+ if (!val) {
+ av_freep(ptr);
+ return AVERROR(ENOMEM);
+ }
+
+ memcpy(ptr, &val, sizeof(val));
+ return 0;
+}
+
+void *av_malloc_array(size_t nmemb, size_t size)
+{
+ size_t result;
+ if (size_mult(nmemb, size, &result) < 0)
+ return NULL;
+ return av_malloc(result);
+}
+
+#if FF_API_AV_MALLOCZ_ARRAY
+void *av_mallocz_array(size_t nmemb, size_t size)
+{
+ size_t result;
+ if (size_mult(nmemb, size, &result) < 0)
+ return NULL;
+ return av_mallocz(result);
+}
+#endif
+
+void *av_realloc_array(void *ptr, size_t nmemb, size_t size)
+{
+ size_t result;
+ if (size_mult(nmemb, size, &result) < 0)
+ return NULL;
+ return av_realloc(ptr, result);
+}
+
+int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
+{
+ void *val;
+
+ memcpy(&val, ptr, sizeof(val));
+ val = av_realloc_f(val, nmemb, size);
+ memcpy(ptr, &val, sizeof(val));
+ if (!val && nmemb && size)
+ return AVERROR(ENOMEM);
+
+ return 0;
+}
+
+void av_free(void *ptr)
+{
+#if HAVE_ALIGNED_MALLOC
+ _aligned_free(ptr);
+#else
+ free(ptr);
+#endif
+}
+
+void av_freep(void *arg)
+{
+ void *val;
+
+ memcpy(&val, arg, sizeof(val));
+ memcpy(arg, &(void *){ NULL }, sizeof(val));
+ av_free(val);
+}
+
+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)
+{
+ size_t result;
+ if (size_mult(nmemb, size, &result) < 0)
+ return NULL;
+ return av_mallocz(result);
+}
+
+char *av_strdup(const char *s)
+{
+ char *ptr = NULL;
+ if (s) {
+ size_t len = strlen(s) + 1;
+ ptr = av_realloc(NULL, len);
+ if (ptr)
+ memcpy(ptr, s, len);
+ }
+ return ptr;
+}
+
+char *av_strndup(const char *s, size_t len)
+{
+ char *ret = NULL, *end;
+
+ if (!s)
+ return NULL;
+
+ end = memchr(s, 0, len);
+ if (end)
+ len = end - s;
+
+ ret = av_realloc(NULL, len + 1);
+ if (!ret)
+ return NULL;
+
+ memcpy(ret, s, len);
+ ret[len] = 0;
+ return ret;
+}
+
+void *av_memdup(const void *p, size_t size)
+{
+ void *ptr = NULL;
+ if (p) {
+ ptr = av_malloc(size);
+ if (ptr)
+ memcpy(ptr, p, size);
+ }
+ return ptr;
+}
+
+int av_dynarray_add_nofree(void *tab_ptr, int *nb_ptr, void *elem)
+{
+ void **tab;
+ memcpy(&tab, tab_ptr, sizeof(tab));
+
+ FF_DYNARRAY_ADD(INT_MAX, sizeof(*tab), tab, *nb_ptr, {
+ tab[*nb_ptr] = elem;
+ memcpy(tab_ptr, &tab, sizeof(tab));
+ }, {
+ return AVERROR(ENOMEM);
+ });
+ return 0;
+}
+
+void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem)
+{
+ void **tab;
+ memcpy(&tab, tab_ptr, sizeof(tab));
+
+ FF_DYNARRAY_ADD(INT_MAX, sizeof(*tab), tab, *nb_ptr, {
+ tab[*nb_ptr] = elem;
+ memcpy(tab_ptr, &tab, sizeof(tab));
+ }, {
+ *nb_ptr = 0;
+ av_freep(tab_ptr);
+ });
+}
+
+void *av_dynarray2_add(void **tab_ptr, int *nb_ptr, size_t elem_size,
+ const uint8_t *elem_data)
+{
+ uint8_t *tab_elem_data = NULL;
+
+ FF_DYNARRAY_ADD(INT_MAX, elem_size, *tab_ptr, *nb_ptr, {
+ tab_elem_data = (uint8_t *)*tab_ptr + (*nb_ptr) * elem_size;
+ if (elem_data)
+ memcpy(tab_elem_data, elem_data, elem_size);
+ else if (CONFIG_MEMORY_POISONING)
+ memset(tab_elem_data, FF_MEMORY_POISON, elem_size);
+ }, {
+ av_freep(tab_ptr);
+ *nb_ptr = 0;
+ });
+ return tab_elem_data;
+}
+
+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);
+
+#if HAVE_FAST_64BIT
+ uint64_t v2= v + ((uint64_t)v<<32);
+ while (len >= 32) {
+ AV_WN64(dst , v2);
+ AV_WN64(dst+ 8, v2);
+ AV_WN64(dst+16, v2);
+ AV_WN64(dst+24, v2);
+ dst += 32;
+ len -= 32;
+ }
+#endif
+
+ 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;
+ }
+}
+
+void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
+{
+ size_t max_size;
+
+ if (min_size <= *size)
+ return ptr;
+
+ max_size = atomic_load_explicit(&max_alloc_size, memory_order_relaxed);
+ /* *size is an unsigned, so the real maximum is <= UINT_MAX. */
+ max_size = FFMIN(max_size, UINT_MAX);
+
+ if (min_size > max_size) {
+ *size = 0;
+ return NULL;
+ }
+
+ min_size = FFMIN(max_size, FFMAX(min_size + min_size / 16 + 32, min_size));
+
+ ptr = av_realloc(ptr, min_size);
+ /* we could set this to the unmodified min_size but this is safer
+ * if the user lost the ptr and uses NULL now
+ */
+ if (!ptr)
+ min_size = 0;
+
+ *size = min_size;
+
+ return ptr;
+}
+
+static inline void fast_malloc(void *ptr, unsigned int *size, size_t min_size, int zero_realloc)
+{
+ size_t max_size;
+ void *val;
+
+ memcpy(&val, ptr, sizeof(val));
+ if (min_size <= *size) {
+ av_assert0(val || !min_size);
+ return;
+ }
+
+ max_size = atomic_load_explicit(&max_alloc_size, memory_order_relaxed);
+ /* *size is an unsigned, so the real maximum is <= UINT_MAX. */
+ max_size = FFMIN(max_size, UINT_MAX);
+
+ if (min_size > max_size) {
+ av_freep(ptr);
+ *size = 0;
+ return;
+ }
+ min_size = FFMIN(max_size, FFMAX(min_size + min_size / 16 + 32, min_size));
+ av_freep(ptr);
+ val = zero_realloc ? av_mallocz(min_size) : av_malloc(min_size);
+ memcpy(ptr, &val, sizeof(val));
+ if (!val)
+ min_size = 0;
+ *size = min_size;
+ return;
+}
+
+void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
+{
+ fast_malloc(ptr, size, min_size, 0);
+}
+
+void av_fast_mallocz(void *ptr, unsigned int *size, size_t min_size)
+{
+ fast_malloc(ptr, size, min_size, 1);
+}
+
+int av_size_mult(size_t a, size_t b, size_t *r)
+{
+ return size_mult(a, b, r);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 22:49:59 +0000