Miscellaneous Functions

Other functions related to memory allocation. Подробнее...

Граф связей класса Miscellaneous Functions:

Функции
static int	av_size_mult (size_t a, size_t b, size_t *r)
void	av_max_alloc (size_t max)

Подробное описание

Other functions related to memory allocation.

Функции

av_size_mult()

static int av_size_mult ( size_t  a, size_t  b, size_t *  r  )

inlinestatic

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/mem.h>

Multiply two size_t values checking for overflow.

Аргументы

[in]	a,b	Operands of multiplication
[out]	r	Pointer to the result of the operation

Возвращает

0 on success, AVERROR(EINVAL) on overflow

См. определение в файле mem.h строка 669

{
    size_t 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);
    *r = t;
    return 0;
}

av_max_alloc()

void av_max_alloc

(

size_t

max

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/mem.h>

Set the maximum size that may be allocated in one block.

The value specified with this function is effective for all libavutil's heap management functions.

By default, the max value is defined as INT_MAX.

Аргументы

max	Value to be set as the new maximum size

Предупреждения

Exercise extreme caution when using this function. Don't touch this if you do not understand the full consequence of doing so.