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mem.c File Reference

default memory allocator for libavutil More...

#include "config.h"
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "avassert.h"
#include "avutil.h"
#include "common.h"
#include "dynarray.h"
#include "intreadwrite.h"
#include "mem.h"
#include "mem_internal.h"

Go to the source code of this file.

Macros

#define _XOPEN_SOURCE   600
 
#define ALIGN   (HAVE_AVX512 ? 64 : (HAVE_AVX ? 32 : 16))
 

Functions

void av_max_alloc (size_t max)
 Set the maximum size that may be allocated in one block. More...
 
voidav_malloc (size_t size)
 Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU). More...
 
voidav_realloc (void *ptr, size_t size)
 Allocate, reallocate, or free a block of memory. More...
 
voidav_realloc_f (void *ptr, size_t nelem, size_t elsize)
 Allocate, reallocate, or free a block of memory. More...
 
int av_reallocp (void *ptr, size_t size)
 Allocate, reallocate, or free a block of memory through a pointer to a pointer. More...
 
voidav_malloc_array (size_t nmemb, size_t size)
 
voidav_mallocz_array (size_t nmemb, size_t size)
 
voidav_realloc_array (void *ptr, size_t nmemb, size_t size)
 
int av_reallocp_array (void *ptr, size_t nmemb, size_t size)
 Allocate, reallocate, or free an array through a pointer to a pointer. More...
 
void av_free (void *ptr)
 Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family. More...
 
void av_freep (void *arg)
 Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family, and set the pointer pointing to it to NULL. More...
 
voidav_mallocz (size_t size)
 Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU) and zero all the bytes of the block. More...
 
voidav_calloc (size_t nmemb, size_t size)
 Non-inlined equivalent of av_mallocz_array(). More...
 
char * av_strdup (const char *s)
 Duplicate a string. More...
 
char * av_strndup (const char *s, size_t len)
 Duplicate a substring of a string. More...
 
voidav_memdup (const void *p, size_t size)
 Duplicate a buffer with av_malloc(). More...
 
int av_dynarray_add_nofree (void *tab_ptr, int *nb_ptr, void *elem)
 Add an element to a dynamic array. More...
 
void av_dynarray_add (void *tab_ptr, int *nb_ptr, void *elem)
 Add the pointer to an element to a dynamic array. More...
 
voidav_dynarray2_add (void **tab_ptr, int *nb_ptr, size_t elem_size, const uint8_t *elem_data)
 Add an element of size elem_size to a dynamic array. More...
 
static void fill16 (uint8_t *dst, int len)
 
static void fill24 (uint8_t *dst, int len)
 
static void fill32 (uint8_t *dst, int len)
 
void av_memcpy_backptr (uint8_t *dst, int back, int cnt)
 Overlapping memcpy() implementation. More...
 
voidav_fast_realloc (void *ptr, unsigned int *size, size_t min_size)
 Reallocate the given buffer if it is not large enough, otherwise do nothing. More...
 
void av_fast_malloc (void *ptr, unsigned int *size, size_t min_size)
 Allocate a buffer, reusing the given one if large enough. More...
 
void av_fast_mallocz (void *ptr, unsigned int *size, size_t min_size)
 Allocate and clear a buffer, reusing the given one if large enough. More...
 

Variables

static size_t max_alloc_size = INT_MAX
 

Detailed Description

default memory allocator for libavutil

Definition in file mem.c.

Macro Definition Documentation

#define _XOPEN_SOURCE   600

Definition at line 27 of file mem.c.

#define ALIGN   (HAVE_AVX512 ? 64 : (HAVE_AVX ? 32 : 16))

Definition at line 64 of file mem.c.

Referenced by av_malloc(), and av_realloc().

Function Documentation

static void fill16 ( uint8_t dst,
int  len 
)
static

Definition at line 340 of file mem.c.

Referenced by av_memcpy_backptr().

static void fill24 ( uint8_t dst,
int  len 
)
static

Definition at line 358 of file mem.c.

Referenced by av_memcpy_backptr().

static void fill32 ( uint8_t dst,
int  len 
)
static

Definition at line 398 of file mem.c.

Referenced by av_memcpy_backptr().

Variable Documentation

size_t max_alloc_size = INT_MAX
static

Definition at line 71 of file mem.c.

Referenced by av_fast_realloc(), av_malloc(), av_max_alloc(), and av_realloc().