/*
* default memory allocator for libavutil
- * Copyright (c) 2002 Fabrice Bellard.
+ * Copyright (c) 2002 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; 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.
+ * @file
+ * default memory allocator for libavutil
*/
-#include "common.h"
-
-/* here we can use OS dependant allocation functions */
-#undef malloc
-#undef free
-#undef realloc
+#include "config.h"
-#ifdef HAVE_MALLOC_H
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#if 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 */
+#include "avutil.h"
+#include "common.h"
+#include "intreadwrite.h"
+#include "mem.h"
-/**
- * Memory allocation of size byte with alignment suitable for all
- * memory accesses (including vectors if available on the
- * CPU). av_malloc(0) must return a non NULL pointer.
- */
-void *av_malloc(unsigned int size)
+#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 */
+
+/* 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(size_t size)
{
- void *ptr;
-#ifdef CONFIG_MEMALIGN_HACK
+ void *ptr = NULL;
+#if CONFIG_MEMALIGN_HACK
long diff;
#endif
- /* let's disallow possible ambiguous cases */
- if(size > (INT_MAX-16) )
+ /* let's disallow possibly ambiguous cases */
+ if (size > (INT_MAX - 32) || !size)
return NULL;
-#ifdef CONFIG_MEMALIGN_HACK
- ptr = malloc(size+16);
- if(!ptr)
+#if CONFIG_MEMALIGN_HACK
+ ptr = malloc(size + 32);
+ if (!ptr)
return ptr;
- diff= ((-(long)ptr - 1)&15) + 1;
- ptr += diff;
- ((char*)ptr)[-1]= diff;
-#elif defined (HAVE_MEMALIGN)
- ptr = memalign(16,size);
+ diff = ((-(long)ptr - 1) & 31) + 1;
+ ptr = (char *)ptr + diff;
+ ((char *)ptr)[-1] = diff;
+#elif HAVE_POSIX_MEMALIGN
+ if (posix_memalign(&ptr, 32, size))
+ ptr = NULL;
+#elif HAVE_ALIGNED_MALLOC
+ ptr = _aligned_malloc(size, 32);
+#elif HAVE_MEMALIGN
+ ptr = memalign(32, 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!
+ * 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 ...
+ /* 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
+ /* 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);
return ptr;
}
-/**
- * av_realloc semantics (same as glibc): if ptr is NULL and size > 0,
- * identical to malloc(size). If size is zero, it is identical to
- * free(ptr) and NULL is returned.
- */
-void *av_realloc(void *ptr, unsigned int size)
+void *av_realloc(void *ptr, size_t size)
{
-#ifdef CONFIG_MEMALIGN_HACK
+#if CONFIG_MEMALIGN_HACK
int diff;
#endif
- /* let's disallow possible ambiguous cases */
- if(size > (INT_MAX-16) )
+ /* let's disallow possibly ambiguous cases */
+ if (size > (INT_MAX - 16))
return NULL;
-#ifdef CONFIG_MEMALIGN_HACK
+#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];
- return realloc(ptr - diff, size + diff) + diff;
+ if (!ptr)
+ return av_malloc(size);
+ diff = ((char *)ptr)[-1];
+ return (char *)realloc((char *)ptr - diff, size + diff) + diff;
+#elif HAVE_ALIGNED_MALLOC
+ return _aligned_realloc(ptr, size, 32);
#else
return realloc(ptr, size);
#endif
}
-/**
- * Free memory which has been allocated with av_malloc(z)() or av_realloc().
- * NOTE: ptr = NULL is explicetly allowed
- * Note2: it is recommended that you use av_freep() instead
- */
+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_realloc_array(void *ptr, size_t nmemb, size_t size)
+{
+ if (!size || nmemb >= INT_MAX / size)
+ return NULL;
+ return av_realloc(ptr, nmemb * size);
+}
+
+int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
+{
+ void *val;
+
+ if (!size || nmemb >= INT_MAX / size)
+ return AVERROR(ENOMEM);
+ if (!nmemb) {
+ av_freep(ptr);
+ return 0;
+ }
+
+ memcpy(&val, ptr, sizeof(val));
+ val = av_realloc(val, nmemb * size);
+ if (!val) {
+ av_freep(ptr);
+ return AVERROR(ENOMEM);
+ }
+
+ memcpy(ptr, &val, sizeof(val));
+ return 0;
+}
+
void av_free(void *ptr)
{
- /* XXX: this test should not be needed on most libcs */
+#if CONFIG_MEMALIGN_HACK
if (ptr)
-#ifdef CONFIG_MEMALIGN_HACK
- free(ptr - ((char*)ptr)[-1]);
+ free((char *)ptr - ((char *)ptr)[-1]);
+#elif HAVE_ALIGNED_MALLOC
+ _aligned_free(ptr);
#else
- free(ptr);
+ free(ptr);
#endif
}
-/**
- * Frees memory and sets the pointer to NULL.
- * @param arg pointer to the pointer which should be freed
- */
void av_freep(void *arg)
{
- void **ptr= (void**)arg;
- av_free(*ptr);
- *ptr = NULL;
+ void *val;
+
+ memcpy(&val, arg, sizeof(val));
+ memcpy(arg, &(void *){ NULL }, sizeof(val));
+ av_free(val);
}
-void *av_mallocz(unsigned int size)
+void *av_mallocz(size_t size)
{
- void *ptr;
-
- ptr = av_malloc(size);
+ void *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);
+ char *ptr = NULL;
+ if (s) {
+ int 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;
+}
+
+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;
+ }
+}
+
+void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
+{
+ if (min_size < *size)
+ return ptr;
+
+ min_size = FFMAX(17 * 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;
}
+void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
+{
+ void **p = ptr;
+ if (min_size < *size)
+ return;
+ min_size = FFMAX(17 * min_size / 16 + 32, min_size);
+ av_free(*p);
+ *p = av_malloc(min_size);
+ if (!*p)
+ min_size = 0;
+ *size = min_size;
+}
projects / ffmpeg / blobdiff