Memory Management

Memory management. More...

Collaboration diagram for Memory Management:

Macros
#define	GF_SAFEALLOC(__ptr, __struct)
	Memory allocation for a structure. More...
#define	GF_SAFE_ALLOC_N(__ptr, __n, __struct)
	Memory allocation for an array of n structs. More...

Functions
void	gf_free (void *ptr)
void *	gf_malloc (size_t size)
void *	gf_calloc (size_t num, size_t size_of)
char *	gf_strdup (const char *str)
void *	gf_realloc (void *ptr, size_t size)
GF_Err	gf_dynstrcat (char **str, const char *to_append, const char *sep)
	dynamic string concatenation More...
Bool	gf_parse_lfrac (const char *str, GF_Fraction64 *frac)
	fraction parsing More...
Bool	gf_parse_frac (const char *str, GF_Fraction *frac)
	fraction parsing More...
Bool	gf_strnistr (const char *text, const char *subtext, u32 subtext_len)
	search string without case More...
u64	gf_timestamp_rescale (u64 value, u64 timescale, u64 new_timescale)
	safe timestamp rescale More...
s64	gf_timestamp_rescale_signed (s64 value, u64 timescale, u64 new_timescale)
	safe signed timestamp rescale More...
Bool	gf_timestamp_less (u64 value1, u64 timescale1, u64 value2, u64 timescale2)
	compare timestamps More...
Bool	gf_timestamp_less_or_equal (u64 value1, u64 timescale1, u64 value2, u64 timescale2)
	compare timestamps More...
Bool	gf_timestamp_greater (u64 value1, u64 timescale1, u64 value2, u64 timescale2)
	compare timestamps More...
Bool	gf_timestamp_greater_or_equal (u64 value1, u64 timescale1, u64 value2, u64 timescale2)
	compare timestamps More...
Bool	gf_timestamp_equal (u64 value1, u64 timescale1, u64 value2, u64 timescale2)
	compare timestamps More...

Detailed Description

GPAC can use its own memory tracker, depending on compilation option. It is recommended to use only the functions defined in this section to allocate and free memory whenever developing within the GPAC library.

Warning

these functions shall only be used after initializing the library using gf_sys_init

Macro Definition Documentation

GF_SAFEALLOC

#define GF_SAFEALLOC	(		__ptr,
			__struct
	)

Macro allocating memory and zero-ing it

GF_SAFE_ALLOC_N

#define GF_SAFE_ALLOC_N	(		__ptr,
			__n,
			__struct
	)

Macro allocating memory for n structures and zero-ing it

Function Documentation

gf_free()

void gf_free

(

void *

ptr

)

free memory allocated with gpac

Parameters

ptr	same as free()

gf_malloc()

void* gf_malloc

(

size_t

size

)

allocates memory, shall be freed using gf_free

Parameters

size	same as malloc()

Returns

address of allocated block

gf_calloc()

void* gf_calloc	(	size_t	num,
		size_t	size_of
	)

allocates memory array, shall be freed using gf_free

Parameters

num	same as calloc()
size_of	same as calloc()

Returns

address of allocated block

gf_strdup()

char* gf_strdup

(

const char *

str

)

duplicates string, shall be freed using gf_free

Parameters

str	same as strdup()

Returns

duplicated string

gf_realloc()

void* gf_realloc	(	void *	ptr,
		size_t	size
	)

reallocates memory, shall be freed using gf_free

Parameters

ptr	same as realloc()
size	same as realloc()

Returns

address of reallocated block

gf_dynstrcat()

GF_Err gf_dynstrcat	(	char **	str,
		const char *	to_append,
		const char *	sep
	)

Dynamic concatenation of string with optional separator

Parameters

str	pointer to destination string pointer
to_append	string to append
sep	optional separator string to insert before concatenation. If set and initial string is NULL, will not be appended

Returns

error code

gf_parse_lfrac()

Bool gf_parse_lfrac	(	const char *	str,
		GF_Fraction64 *	frac
	)

Parse a 64 bit fraction from string

Parameters

str	string to parse
frac	fraction to fill

Returns

GF_TRUE if success, GF_FALSE otherwise ( fraction being set to {0,0} )

gf_parse_frac()

Bool gf_parse_frac	(	const char *	str,
		GF_Fraction *	frac
	)

Parse a 32 bit fraction from string

Parameters

str	string to parse
frac	fraction to fill

Returns

GF_TRUE if success, GF_FALSE otherwise ( fraction being set to {0,0} )

gf_strnistr()

Bool gf_strnistr	(	const char *	text,
		const char *	subtext,
		u32	subtext_len
	)

Search a aubstring in a string witout checking for case

Parameters

text	text to search
subtext	string to find
subtext_len	length of string to find

Returns

GF_TRUE if success, GF_FALSE otherwise

gf_timestamp_rescale()

u64 gf_timestamp_rescale	(	u64	value,
		u64	timescale,
		u64	new_timescale
	)

Rescale a 64 bit timestamp value to new timescale, i.e. performs value * new_timescale / timescale

Parameters

value	value to rescale. A value of -1 means no timestamp defined and is returned unmodified
timescale	timescale of value. Assumed to be less than 0xFFFFFFFF
new_timescale	new timescale? Assumed to be less than 0xFFFFFFFF

Returns

new value

gf_timestamp_rescale_signed()

s64 gf_timestamp_rescale_signed	(	s64	value,
		u64	timescale,
		u64	new_timescale
	)

Rescale a 64 bit timestamp value to new timescale, i.e. performs value * new_timescale / timescale

Parameters

value	value to rescale
timescale	timescale of value. Assumed to be less than 0xFFFFFFFF
new_timescale	new timescale. Assumed to be less than 0xFFFFFFFF

Returns

new value

gf_timestamp_less()

Bool gf_timestamp_less	(	u64	value1,
		u64	timescale1,
		u64	value2,
		u64	timescale2
	)

Compares two timestamps

Parameters

value1	value to rescale
timescale1	timescale of value. Assumed to be less than 0xFFFFFFFF
value2	value to rescale
timescale2	timescale of value. Assumed to be less than 0xFFFFFFFF

Returns

GF_TRUE if (value1 / timescale1) is stricly less than (value2 / timescale2)

gf_timestamp_less_or_equal()

Bool gf_timestamp_less_or_equal	(	u64	value1,
		u64	timescale1,
		u64	value2,
		u64	timescale2
	)

Compares two timestamps

Parameters

value1	value to rescale
timescale1	timescale of value. Assumed to be less than 0xFFFFFFFF
value2	value to rescale
timescale2	timescale of value. Assumed to be less than 0xFFFFFFFF

Returns

GF_TRUE if (value1 / timescale1) is stricly less than or equal to (value2 / timescale2)

gf_timestamp_greater()

Bool gf_timestamp_greater	(	u64	value1,
		u64	timescale1,
		u64	value2,
		u64	timescale2
	)

Compares two timestamps

Parameters

value1	value to rescale
timescale1	timescale of value. Assumed to be less than 0xFFFFFFFF
value2	value to rescale
timescale2	timescale of value. Assumed to be less than 0xFFFFFFFF

Returns

GF_TRUE if (value1 / timescale1) is stricly greater than (value2 / timescale2)

gf_timestamp_greater_or_equal()

Bool gf_timestamp_greater_or_equal	(	u64	value1,
		u64	timescale1,
		u64	value2,
		u64	timescale2
	)

Compares two timestamps

Parameters

value1	value to rescale
timescale1	timescale of value. Assumed to be less than 0xFFFFFFFF
value2	value to rescale
timescale2	timescale of value. Assumed to be less than 0xFFFFFFFF

Returns

GF_TRUE if (value1 / timescale1) is stricly greater than or equal to (value2 / timescale2)

gf_timestamp_equal()

Bool gf_timestamp_equal	(	u64	value1,
		u64	timescale1,
		u64	value2,
		u64	timescale2
	)

Compares two timestamps

Parameters

value1	value to rescale
timescale1	timescale of value. Assumed to be less than 0xFFFFFFFF
value2	value to rescale
timescale2	timescale of value. Assumed to be less than 0xFFFFFFFF

Returns

GF_TRUE if (value1 / timescale1) is equal to (value2 / timescale2)