Variables

VLC object variables and callbacks. More...

Collaboration diagram for Variables:

Modules
	Variable types
	These are the different types a vlc variable can have.
	Additive flags
	These flags are added to the type field of the variable.
	Variable actions
	These are the different actions that can be used with var_Change().

Files
file	vlc_variables.h
	VLC object variables and callbacks interface.

Data Structures
union	vlc_value_t
	VLC value structure. More...

Macros
#define	VLC_VAR_TYPE   0x00ff
#define	VLC_VAR_CLASS   0x00f0
#define	VLC_VAR_FLAGS   0xff00

Typedefs
typedef int(*	vlc_callback_t) (vlc_object_t *, char const *, vlc_value_t, vlc_value_t, void *)
typedef int(*	vlc_list_callback_t) (vlc_object_t *, char const *, int, vlc_value_t *, void *)

Enumerations
enum	vlc_var_atomic_op { VLC_VAR_BOOL_TOGGLE , VLC_VAR_INTEGER_ADD , VLC_VAR_INTEGER_OR , VLC_VAR_INTEGER_NAND }
	Variable actions. More...

Functions
int	var_Create (vlc_object_t *obj, const char *name, int type)
	Creates a VLC object variable.
void	var_Destroy (vlc_object_t *obj, const char *name)
	Destroys a VLC object variable.
int	var_Change (vlc_object_t *obj, const char *name, int action,...)
	Performs a special action on a variable.
int	var_Type (vlc_object_t *obj, const char *name)
	Get the type of a variable.
int	var_Set (vlc_object_t *obj, const char *name, vlc_value_t val)
	Sets a variable value.
int	var_Get (vlc_object_t *obj, const char *name, vlc_value_t *valp)
	Gets a variable value.
int	var_SetChecked (vlc_object_t *, const char *, int, vlc_value_t)
int	var_GetChecked (vlc_object_t *, const char *, int, vlc_value_t *)
int	var_GetAndSet (vlc_object_t *obj, const char *name, int op, vlc_value_t *value)
	Perform an atomic read-modify-write of a variable.
int	var_Inherit (vlc_object_t *, const char *, int, vlc_value_t *)
	Finds the value of a variable.
void	var_AddCallback (vlc_object_t *obj, const char *name, vlc_callback_t callback, void *opaque)
	Registers a callback for a variable.
void	var_DelCallback (vlc_object_t *obj, const char *name, vlc_callback_t callback, void *opaque)
	Deregisters a callback from a variable.
void	var_TriggerCallback (vlc_object_t *obj, const char *name)
	Triggers callbacks on a variable.
void	var_AddListCallback (vlc_object_t *, const char *, vlc_list_callback_t, void *)
	Register a callback for a list variable.
void	var_DelListCallback (vlc_object_t *, const char *, vlc_list_callback_t, void *)
	Remove a callback from a list variable.
static int	var_SetInteger (vlc_object_t *p_obj, const char *psz_name, int64_t i)
	Set the value of an integer variable.
static int	var_SetBool (vlc_object_t *p_obj, const char *psz_name, bool b)
	Set the value of an boolean variable.
static int	var_SetCoords (vlc_object_t *obj, const char *name, int32_t x, int32_t y)
static int	var_SetFloat (vlc_object_t *p_obj, const char *psz_name, float f)
	Set the value of a float variable.
static int	var_SetString (vlc_object_t *p_obj, const char *psz_name, const char *psz_string)
	Set the value of a string variable.
static int	var_SetAddress (vlc_object_t *p_obj, const char *psz_name, void *ptr)
	Set the value of a pointer variable.
static int64_t	var_GetInteger (vlc_object_t *p_obj, const char *psz_name)
	Get an integer value.
static bool	var_GetBool (vlc_object_t *p_obj, const char *psz_name)
	Get a boolean value.
static void	var_GetCoords (vlc_object_t *obj, const char *name, int32_t *px, int32_t *py)
static float	var_GetFloat (vlc_object_t *p_obj, const char *psz_name)
	Get a float value.
static char *	var_GetString (vlc_object_t *p_obj, const char *psz_name)
	Get a string value.
static char *	var_GetNonEmptyString (vlc_object_t *p_obj, const char *psz_name)
static void *	var_GetAddress (vlc_object_t *p_obj, const char *psz_name)
static int64_t	var_IncInteger (vlc_object_t *p_obj, const char *psz_name)
	Increment an integer variable.
static int64_t	var_DecInteger (vlc_object_t *p_obj, const char *psz_name)
	Decrement an integer variable.
static uint64_t	var_OrInteger (vlc_object_t *obj, const char *name, unsigned v)
static uint64_t	var_NAndInteger (vlc_object_t *obj, const char *name, unsigned v)
static int64_t	var_CreateGetInteger (vlc_object_t *p_obj, const char *psz_name)
	Create a integer variable with inherit and get its value.
static bool	var_CreateGetBool (vlc_object_t *p_obj, const char *psz_name)
	Create a boolean variable with inherit and get its value.
static float	var_CreateGetFloat (vlc_object_t *p_obj, const char *psz_name)
	Create a float variable with inherit and get its value.
static char *	var_CreateGetString (vlc_object_t *p_obj, const char *psz_name)
	Create a string variable with inherit and get its value.
static char *	var_CreateGetNonEmptyString (vlc_object_t *p_obj, const char *psz_name)
static void *	var_CreateGetAddress (vlc_object_t *p_obj, const char *psz_name)
	Create an address variable with inherit and get its value.
static int64_t	var_CreateGetIntegerCommand (vlc_object_t *p_obj, const char *psz_name)
	Create a integer command variable with inherit and get its value.
static bool	var_CreateGetBoolCommand (vlc_object_t *p_obj, const char *psz_name)
	Create a boolean command variable with inherit and get its value.
static float	var_CreateGetFloatCommand (vlc_object_t *p_obj, const char *psz_name)
	Create a float command variable with inherit and get its value.
static char *	var_CreateGetStringCommand (vlc_object_t *p_obj, const char *psz_name)
	Create a string command variable with inherit and get its value.
static char *	var_CreateGetNonEmptyStringCommand (vlc_object_t *p_obj, const char *psz_name)
static size_t	var_CountChoices (vlc_object_t *p_obj, const char *psz_name)
static bool	var_ToggleBool (vlc_object_t *p_obj, const char *psz_name)
static bool	var_InheritBool (vlc_object_t *obj, const char *name)
static int64_t	var_InheritInteger (vlc_object_t *obj, const char *name)
static float	var_InheritFloat (vlc_object_t *obj, const char *name)
static char *	var_InheritString (vlc_object_t *obj, const char *name)
static void *	var_InheritAddress (vlc_object_t *obj, const char *name)
int	var_InheritURational (vlc_object_t *obj, unsigned *num, unsigned *den, const char *name)
	Inherit a string as a fractional value.
int	var_LocationParse (vlc_object_t *obj, const char *mrl, const char *prefix)
	Parses a string with multiple options.

Detailed Description

VLC object variables and callbacks.

Macro Definition Documentation

VLC_VAR_CLASS

#define VLC_VAR_CLASS   0x00f0

VLC_VAR_FLAGS

#define VLC_VAR_FLAGS   0xff00

VLC_VAR_TYPE

#define VLC_VAR_TYPE   0x00ff

Typedef Documentation

vlc_callback_t

typedef int(* vlc_callback_t) (vlc_object_t *, char const *, vlc_value_t, vlc_value_t, void *)

vlc_list_callback_t

typedef int(* vlc_list_callback_t) (vlc_object_t *, char const *, int, vlc_value_t *, void *)

Enumeration Type Documentation

vlc_var_atomic_op

enum vlc_var_atomic_op

Variable actions.

These are the different actions that can be used with var_GetAndSet().

Enumerator
VLC_VAR_BOOL_TOGGLE	Invert a boolean value (param ignored)
VLC_VAR_INTEGER_ADD	Add parameter to an integer value.
VLC_VAR_INTEGER_OR	Binary OR over an integer bits field.
VLC_VAR_INTEGER_NAND	Binary NAND over an integer bits field.

Function Documentation

var_AddCallback()

void var_AddCallback	(	vlc_object_t *	obj,
		const char *	name,
		vlc_callback_t	callback,
		void *	opaque
	)

Registers a callback for a variable.

We store a function pointer that will be called upon variable modification.

Parameters

obj	Object holding the variable
name	Variable name
callback	Callback function pointer
opaque	Opaque data pointer for use by the callback.

Warning

The callback function is run in the thread that calls var_Set() on the variable. Use proper locking. This thread may not have much time to spare, so keep callback functions short.

Bug:

It is not possible to atomically retrieve the current value and register a callback. As a consequence, extreme care must be taken to ensure that the variable value cannot change before the callback is registered. Failure to do so will result in intractable race conditions.

References AddCallback(), psz_name, vlc_value_callback, and xmalloc().

Referenced by aout_FiltersNewWithClock(), aout_New(), aout_volume_New(), filter_AddProxyCallbacks(), intf_Create(), libvlc_InternalActionsInit(), vlc_player_aout_AddCallbacks(), vlc_player_New(), vlc_player_vout_AddCallbacks(), vout_CreateVars(), vout_InitInterlacingSupport(), vout_IntfInit(), and vout_OpenWrapper().

var_AddListCallback()

void var_AddListCallback	(	vlc_object_t *	p_this,
		const char *	psz_name,
		vlc_list_callback_t	pf_callback,
		void *	p_data
	)

Register a callback for a list variable.

The callback is triggered when an element is added/removed from the list or when the list is cleared.

See var_AddCallback().

References AddCallback(), psz_name, vlc_list_callback, and xmalloc().

var_Change()

int var_Change	(	vlc_object_t *	obj,
		const char *	name,
		int	action,
			...
	)

Performs a special action on a variable.

Parameters

obj	Object holding the variable
name	Variable name
action	Action to perform. Must be one of Variable actions

References CheckValue(), variable_t::choices, variable_t::choices_count, variable_t::choices_text, count, vlc_value_t::f_float, FreeDummy(), vlc_value_t::i_int, variable_t::i_type, Lookup(), variable_t::max, variable_t::min, variable_t::ops, variable_ops_t::pf_cmp, variable_ops_t::pf_dup, variable_ops_t::pf_free, psz_name, variable_t::psz_text, variable_t::step, strdup(), TAB_APPEND, TAB_CLEAN, TAB_ERASE, TriggerListCallback(), variable_t::val, vlc_object_internals::var_lock, VLC_EGENERIC, VLC_ENOENT, vlc_internals, vlc_mutex_unlock(), VLC_SUCCESS, VLC_VAR_ADDCHOICE, VLC_VAR_CHOICESCOUNT, VLC_VAR_CLEARCHOICES, VLC_VAR_DELCHOICE, VLC_VAR_FLOAT, VLC_VAR_GETCHOICES, VLC_VAR_GETMAX, VLC_VAR_GETMIN, VLC_VAR_GETSTEP, VLC_VAR_GETTEXT, VLC_VAR_INTEGER, VLC_VAR_SETMINMAX, VLC_VAR_SETSTEP, VLC_VAR_SETTEXT, VLC_VAR_SETVALUE, VLC_VAR_TYPE, and xmalloc().

Referenced by AddCustomRatios(), aout_AddMixModeChoice(), aout_HasMixModeChoice(), aout_HasStereoMode(), aout_New(), aout_OutputNew(), aout_PrepareStereoMode(), aout_UpdateMixMode(), aout_UpdateStereoMode(), config_ChainParse(), config_LoadCmdLine(), intf_Create(), var_CountChoices(), ViewpointApply(), vout_CreateVars(), vout_InitInterlacingSupport(), and vout_osd_PrintVariableText().

var_CountChoices()

static size_t var_CountChoices ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

References count, psz_name, var_Change(), and VLC_VAR_CHOICESCOUNT.

Referenced by EsOutSetRecord().

var_Create()

int var_Create	(	vlc_object_t *	obj,
		const char *	name,
		int	type
	)

Creates a VLC object variable.

This function creates a named variable within a VLC object. If a variable already exists with the same name within the same object, its reference count is incremented instead.

Parameters

obj	Object to hold the variable
name	Variable name
type	Variable type. Must be one of Variable types combined with zero or more Additive flags

References addr_ops, vlc_value_t::b_bool, variable_t::b_incallback, bool_ops, variable_t::choices, variable_t::choices_count, variable_t::choices_text, vlc_value_t::coords, coords_ops, Destroy(), vlc_value_t::f_float, float_ops, vlc_value_t::i_int, variable_t::i_type, i_type, variable_t::i_usage, int_ops, variable_t::max, variable_t::min, variable_t::ops, vlc_value_t::p_address, psz_name, variable_t::psz_name, vlc_value_t::psz_string, variable_t::psz_text, strdup(), string_ops, tsearch(), unlikely, variable_t::val, variable_t::value_callbacks, var_Inherit(), vlc_object_internals::var_lock, vlc_object_internals::var_root, varcmp(), vlc_assert_unreachable, vlc_cond_init(), VLC_ENOMEM, vlc_internals, vlc_mutex_lock(), vlc_mutex_unlock(), VLC_SUCCESS, VLC_VAR_ADDRESS, VLC_VAR_BOOL, VLC_VAR_CLASS, VLC_VAR_COORDS, VLC_VAR_DOINHERIT, VLC_VAR_FLOAT, VLC_VAR_INTEGER, VLC_VAR_ISCOMMAND, VLC_VAR_STRING, VLC_VAR_VOID, void_ops, variable_t::wait, vlc_value_t::x, and vlc_value_t::y.

Referenced by aout_New(), config_ChainParse(), config_LoadCmdLine(), config_PrintHelp(), demux_NewAdvanced(), filter_AddProxyCallbacks(), input_ConfigVarInit(), input_item_ApplyOptions(), InputSourceInit(), intf_Create(), libvlc_InternalActionsInit(), libvlc_InternalInit(), LoadSlaves(), module_need(), OpenURL(), system_Configure(), var_CreateGetAddress(), var_CreateGetBool(), var_CreateGetBoolCommand(), var_CreateGetFloat(), var_CreateGetFloatCommand(), var_CreateGetInteger(), var_CreateGetIntegerCommand(), var_CreateGetNonEmptyString(), var_CreateGetNonEmptyStringCommand(), var_CreateGetString(), var_CreateGetStringCommand(), var_OptionParse(), VisualizationCallback(), vlc_filter_LoadModule(), vlc_player_Start(), vlm_New(), vout_Create(), vout_CreateVars(), vout_display_window_New(), vout_InitInterlacingSupport(), and vout_OpenWrapper().

var_CreateGetAddress()

static void * var_CreateGetAddress ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create an address variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetAddress(), VLC_VAR_ADDRESS, and VLC_VAR_DOINHERIT.

Referenced by vlc_mta_acquire().

var_CreateGetBool()

static bool var_CreateGetBool ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a boolean variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetBool(), VLC_VAR_BOOL, and VLC_VAR_DOINHERIT.

Referenced by decoder_UpdateVideoOutput().

var_CreateGetBoolCommand()

static bool var_CreateGetBoolCommand ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a boolean command variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetBool(), VLC_VAR_BOOL, VLC_VAR_DOINHERIT, and VLC_VAR_ISCOMMAND.

var_CreateGetFloat()

static float var_CreateGetFloat ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a float variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetFloat(), VLC_VAR_DOINHERIT, and VLC_VAR_FLOAT.

var_CreateGetFloatCommand()

static float var_CreateGetFloatCommand ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a float command variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetFloat(), VLC_VAR_DOINHERIT, VLC_VAR_FLOAT, and VLC_VAR_ISCOMMAND.

var_CreateGetInteger()

static int64_t var_CreateGetInteger ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a integer variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetInteger(), VLC_VAR_DOINHERIT, and VLC_VAR_INTEGER.

Referenced by AddressCreate(), input_EsOutTimeshiftNew(), and OpenURL().

var_CreateGetIntegerCommand()

static int64_t var_CreateGetIntegerCommand ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a integer command variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetInteger(), VLC_VAR_DOINHERIT, VLC_VAR_INTEGER, and VLC_VAR_ISCOMMAND.

var_CreateGetNonEmptyString()

static char * var_CreateGetNonEmptyString ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

References psz_name, var_Create(), var_GetNonEmptyString(), VLC_VAR_DOINHERIT, and VLC_VAR_STRING.

Referenced by EsOutSetRecord(), OpenURL(), and vout_CreateVars().

var_CreateGetNonEmptyStringCommand()

static char * var_CreateGetNonEmptyStringCommand ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

References psz_name, var_Create(), var_GetNonEmptyString(), VLC_VAR_DOINHERIT, VLC_VAR_ISCOMMAND, and VLC_VAR_STRING.

var_CreateGetString()

static char * var_CreateGetString ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a string variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetString(), VLC_VAR_DOINHERIT, and VLC_VAR_STRING.

var_CreateGetStringCommand()

static char * var_CreateGetStringCommand ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Create a string command variable with inherit and get its value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, var_Create(), var_GetString(), VLC_VAR_DOINHERIT, VLC_VAR_ISCOMMAND, and VLC_VAR_STRING.

var_DecInteger()

static int64_t var_DecInteger ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Decrement an integer variable.

Parameters

p_obj	the object that holds the variable
psz_name	the name of the variable

References vlc_value_t::i_int, psz_name, var_GetAndSet(), and VLC_VAR_INTEGER_ADD.

Referenced by aout_PolicyNotify().

var_DelCallback()

void var_DelCallback	(	vlc_object_t *	obj,
		const char *	name,
		vlc_callback_t	callback,
		void *	opaque
	)

Deregisters a callback from a variable.

The callback and opaque pointer must be supplied again, as the same callback function might have been registered more than once.

References DelCallback(), psz_name, and vlc_value_callback.

Referenced by aout_Destroy(), aout_FiltersDelete(), aout_FiltersNewWithClock(), aout_volume_Delete(), filter_DelProxyCallbacks(), intf_DestroyAll(), libvlc_InternalActionsClean(), vlc_player_aout_DelCallbacks(), vlc_player_Delete(), vlc_player_New(), vlc_player_vout_DelCallbacks(), vout_CloseWrapper(), and vout_IntfDeinit().

var_DelListCallback()

void var_DelListCallback	(	vlc_object_t *	p_this,
		const char *	psz_name,
		vlc_list_callback_t	pf_callback,
		void *	p_data
	)

Remove a callback from a list variable.

See var_DelCallback().

References DelCallback(), psz_name, and vlc_list_callback.

var_Destroy()

void var_Destroy	(	vlc_object_t *	obj,
		const char *	name
	)

Destroys a VLC object variable.

This function decrements the reference count of a named variable within a VLC object. If the reference count reaches zero, the variable is destroyed.

Parameters

obj	Object holding the variable
name	Variable name

References variable_t::b_incallback, Destroy(), variable_t::i_usage, Lookup(), msg_Dbg, psz_name, tdelete(), vlc_object_internals::var_lock, vlc_object_internals::var_root, varcmp(), vlc_internals, and vlc_mutex_unlock().

Referenced by LoadSlaves(), module_unneed(), vlc_filter_UnloadModule(), vlc_player_Delete(), vout_Create(), and vout_display_window_Delete().

var_Get()

int var_Get	(	vlc_object_t *	obj,
		const char *	name,
		vlc_value_t *	valp
	)

Gets a variable value.

Parameters

obj	Object holding the variable
name	Variable name
valp	Pointer to a vlc_value_t object to hold the value [OUT]

References psz_name, and var_GetChecked().

Referenced by config_ChainParse().

var_GetAddress()

static void * var_GetAddress ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

References vlc_value_t::p_address, psz_name, var_GetChecked(), and VLC_VAR_ADDRESS.

Referenced by var_CreateGetAddress(), and vlc_player_Delete().

var_GetAndSet()

int var_GetAndSet	(	vlc_object_t *	obj,
		const char *	name,
		int	op,
		vlc_value_t *	value
	)

Perform an atomic read-modify-write of a variable.

Parameters

obj	object holding the variable
name	variable name
op	read-modify-write operation to perform (see vlc_var_atomic_op)
value	value of the variable after the modification

Return values

VLC_SUCCESS	Operation successful
VLC_ENOENT	Variable not found

Bug:

The modified value is returned rather than the original value. As such, the original value cannot be known in the case of non-reversible operation such as VLC_VAR_INTEGER_OR and VLC_VAR_INTEGER_NAND.

References vlc_value_t::b_bool, CheckValue(), vlc_value_t::i_int, variable_t::i_type, Lookup(), psz_name, TriggerCallback(), variable_t::val, vlc_object_internals::var_lock, VLC_EGENERIC, VLC_ENOENT, vlc_internals, vlc_mutex_unlock(), VLC_SUCCESS, VLC_VAR_BOOL, VLC_VAR_BOOL_TOGGLE, VLC_VAR_INTEGER, VLC_VAR_INTEGER_ADD, VLC_VAR_INTEGER_NAND, VLC_VAR_INTEGER_OR, and WaitUnused().

Referenced by var_DecInteger(), var_IncInteger(), var_NAndInteger(), var_OrInteger(), and var_ToggleBool().

var_GetBool()

static bool var_GetBool ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Get a boolean value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References vlc_value_t::b_bool, psz_name, var_GetChecked(), and VLC_VAR_BOOL.

Referenced by DeinterlaceCallback(), EsOutSelectEs(), InitPrograms(), InputSourceInit(), LoadSlaves(), var_CreateGetBool(), var_CreateGetBoolCommand(), vlc_input_decoder_GetVbiPage(), vlc_player_destructor_Thread(), vlc_player_input_NavigationFallback(), vlc_player_IsTrackCategoryEnabled(), vlc_player_UpdateMLStates(), vlc_player_vout_IsFullscreen(), vlc_player_vout_IsWallpaperModeEnabled(), vout_display_window_New(), and VoutGetDisplayCfg().

var_GetChecked()

int var_GetChecked	(	vlc_object_t *	p_this,
		const char *	psz_name,
		int	expected_type,
		vlc_value_t *	p_val
	)

References variable_t::i_type, Lookup(), variable_t::ops, variable_ops_t::pf_dup, psz_name, variable_t::val, vlc_object_internals::var_lock, VLC_ENOENT, vlc_internals, vlc_mutex_unlock(), VLC_SUCCESS, VLC_VAR_CLASS, and VLC_VAR_VOID.

Referenced by var_Get(), var_GetAddress(), var_GetBool(), var_GetCoords(), var_GetFloat(), var_GetInteger(), var_GetNonEmptyString(), var_GetString(), and var_Inherit().

var_GetCoords()

static void var_GetCoords ( vlc_object_t *  obj, const char *  name, int32_t *  px, int32_t *  py  )

inlinestatic

References vlc_value_t::coords, likely, name, var_GetChecked(), VLC_VAR_COORDS, vlc_value_t::x, and vlc_value_t::y.

var_GetFloat()

static float var_GetFloat ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Get a float value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References vlc_value_t::f_float, psz_name, var_GetChecked(), and VLC_VAR_FLOAT.

Referenced by aout_VolumeGet(), Init(), SetStopStart(), var_CreateGetFloat(), var_CreateGetFloatCommand(), vlc_player_GetAssociatedSubsFPS(), vlc_player_GetRate(), vlc_player_UpdateMLStates(), and VoutGetDisplayCfg().

var_GetInteger()

static int64_t var_GetInteger ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Get an integer value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References vlc_value_t::i_int, psz_name, var_GetChecked(), and VLC_VAR_INTEGER.

Referenced by aout_New(), Control(), CropBorderCallback(), DeinterlaceCallback(), EsOutPropsInit(), input_EsOutNew(), InputSourceInit(), MainLoopTryRepeat(), subtitles_Detect(), UpdatePtsDelay(), var_CreateGetInteger(), var_CreateGetIntegerCommand(), vlc_input_decoder_GetVbiPage(), vlc_player_GetSubtitleTextScale(), vlc_player_vout_OSDCallback(), vout_InitInterlacingSupport(), VoutGetDisplayCfg(), and VoutSaveSnapshot().

var_GetNonEmptyString()

static char * var_GetNonEmptyString ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

References psz_name, vlc_value_t::psz_string, var_GetChecked(), and VLC_VAR_STRING.

Referenced by aout_DeviceGet(), aout_New(), EsOutPropsInit(), EsOutSelect(), GetVarSlaves(), InitPrograms(), InitSout(), InputMetaUser(), InputSourceInit(), LoadSlaves(), var_CreateGetNonEmptyString(), var_CreateGetNonEmptyStringCommand(), vlc_player_UpdateMLStates(), and vout_InitInterlacingSupport().

var_GetString()

static char * var_GetString ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Get a string value.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable

References psz_name, vlc_value_t::psz_string, var_GetChecked(), and VLC_VAR_STRING.

Referenced by aout_EnableFilter(), DeinterlaceCallback(), EsOutPropsInit(), system_ConfigureDbus(), var_CreateGetString(), var_CreateGetStringCommand(), vlc_player_GetCategoryLanguage(), and vlc_player_vout_OSDCallback().

var_IncInteger()

static int64_t var_IncInteger ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

Increment an integer variable.

Parameters

p_obj	the object that holds the variable
psz_name	the name of the variable

References vlc_value_t::i_int, psz_name, var_GetAndSet(), and VLC_VAR_INTEGER_ADD.

Referenced by aout_PolicyNotify().

var_Inherit()

int var_Inherit	(	vlc_object_t *	p_this,
		const char *	psz_name,
		int	i_type,
		vlc_value_t *	p_val
	)

Finds the value of a variable.

If the specified object does not hold a variable with the specified name, try the parent object, and iterate until the top of the objects tree. If no match is found, the value is read from the configuration.

References vlc_value_t::b_bool, config_GetFloat(), config_GetInt(), config_GetPsz(), vlc_value_t::f_float, vlc_value_t::i_int, i_type, psz_name, vlc_value_t::psz_string, var_GetChecked(), vlc_assert_unreachable, VLC_ENOENT, vlc_object_parent, VLC_SUCCESS, VLC_VAR_ADDRESS, VLC_VAR_BOOL, VLC_VAR_CLASS, VLC_VAR_FLOAT, VLC_VAR_INTEGER, and VLC_VAR_STRING.

Referenced by var_Create(), var_InheritAddress(), var_InheritBool(), var_InheritFloat(), var_InheritInteger(), and var_InheritString().

var_InheritAddress()

static void * var_InheritAddress ( vlc_object_t *  obj, const char *  name  )

inlinestatic

References name, vlc_value_t::p_address, var_Inherit(), and VLC_VAR_ADDRESS.

Referenced by input_Create(), Open(), and vlc_mta_release().

var_InheritBool()

static bool var_InheritBool ( vlc_object_t *  obj, const char *  name  )

inlinestatic

References vlc_value_t::b_bool, name, var_Inherit(), and VLC_VAR_BOOL.

Referenced by aout_FiltersNewWithClock(), aout_MuteGet(), aout_New(), aout_ReplayGainSelect(), config_PrintHelp(), input_Create(), InputDemuxNew(), libvlc_GetMainPlaylist(), libvlc_InternalCleanup(), libvlc_InternalInit(), libvlc_InternalPlay(), ListModules(), MainLoop(), ModuleThread_GetDecoderDevice(), Open(), OSDWidget(), PlaylistConfigureFromVariables(), sout_NewInstance(), system_Configure(), system_ConfigureDbus(), Usage(), vlc_player_input_RestoreMlStates(), vlc_readdir_helper_init(), vlc_threads_setup(), vlc_xlib_init(), vout_Create(), vout_display_window_New(), vout_OSDText(), VoutOsdSnapshot(), and VoutSaveSnapshot().

var_InheritFloat()

static float var_InheritFloat ( vlc_object_t *  obj, const char *  name  )

inlinestatic

References vlc_value_t::f_float, name, var_Inherit(), and VLC_VAR_FLOAT.

Referenced by aout_ReplayGainSelect(), aout_VolumeUpdate(), and SetSubtitlesOptions().

var_InheritInteger()

static int64_t var_InheritInteger ( vlc_object_t *  obj, const char *  name  )

inlinestatic

References vlc_value_t::i_int, name, var_Inherit(), and VLC_VAR_INTEGER.

Referenced by Control(), FileControl(), httpd_HostCreate(), input_Create(), input_EsOutNew(), input_fetcher_New(), libvlc_GetMainPlaylist(), libvlc_InternalActionsInit(), LiveControl(), ModuleThread_UpdateAudioFormat(), net_Connect(), net_ConnectDgram(), OpenSDP(), OpenURL(), sout_MuxSendBuffer(), spu_Create(), var_InheritFit(), vlc_player_input_NavigationFallback(), vlc_player_input_New(), vlc_player_input_RestoreMlStates(), vlc_readdir_helper_init(), vlc_rtsp_HostNew(), vlc_tls_ClientSessionCreate(), vlc_window_New(), vout_Create(), vout_display_window_New(), and vout_GetSnapshot().

var_InheritString()

static char * var_InheritString ( vlc_object_t *  obj, const char *  name  )

inlinestatic

References name, vlc_value_t::psz_string, var_Inherit(), and VLC_VAR_STRING.

Referenced by aout_FiltersNewWithClock(), ChangeFilters(), clock_source_Inherit(), config_GetConfigFile(), config_PrintHelp(), FindResampler(), httpd_HostCreate(), init_action(), input_EsOutTimeshiftNew(), InputDemuxNew(), InputSourceInit(), libvlc_AddInterfaces(), libvlc_GetMainPlaylist(), libvlc_InternalAddIntf(), libvlc_InternalCleanup(), libvlc_InternalInit(), module_need_var(), net_ConnectDgram(), net_ConnectTCP(), net_Socket(), Open(), SelectClockSource(), SpuRenderCreateAndLoadText(), var_InheritURational(), vlc_actions_get_keycodes(), vlc_credential_get(), vlc_decoder_device_Create(), vlc_gl_surface_Create(), vlc_https_HostNew(), vlc_keystore_create(), vlc_readdir_helper_init(), vout_Create(), vout_display_window_New(), vout_InitSource(), vout_OpenWrapper(), and VoutSaveSnapshot().

var_InheritURational()

int var_InheritURational	(	vlc_object_t *	obj,
		unsigned *	num,
		unsigned *	den,
		const char *	name
	)

Inherit a string as a fractional value.

This function inherits a string, and interprets it as an unsigned rational number, i.e. a fraction. It also accepts a normally formatted floating point number.

Warning

The caller shall perform any and all necessary boundary checks.

Note

The rational number is always reduced, i.e. the returned numerator and denominator are always co-prime numbers.

Fraction with zero as denominator are considered valid, including the undefined form zero-by-zero.

Returns

Zero on success, an error if parsing fails.

References var, var_InheritString(), VLC_EGENERIC, VLC_SUCCESS, and vlc_ureduce().

Referenced by VoutGetDisplayCfg().

var_LocationParse()

int var_LocationParse	(	vlc_object_t *	obj,
		const char *	mrl,
		const char *	prefix
	)

Parses a string with multiple options.

Parses a set of colon-separated or semicolon-separated name=value pairs. Some access (or access_demux) plugins uses this scheme in media resource location.

Note

Only trusted/safe variables are allowed. This is intended.

Warning

Only use this for plugins implementing VLC-specific resource location schemes. This would not make any sense for standardized ones.

Parameters

obj	VLC object on which to set variables (and emit error messages)
mrl	string to parse
prefix	prefix to prepend to option names in the string

Returns

VLC_ENOMEM on error, VLC_SUCCESS on success.

References likely, var_OptionParse(), VLC_ENOMEM, and VLC_SUCCESS.

var_NAndInteger()

static uint64_t var_NAndInteger ( vlc_object_t *  obj, const char *  name, unsigned  v  )

inlinestatic

References vlc_value_t::i_int, name, var_GetAndSet(), and VLC_VAR_INTEGER_NAND.

var_OrInteger()

static uint64_t var_OrInteger ( vlc_object_t *  obj, const char *  name, unsigned  v  )

inlinestatic

References vlc_value_t::i_int, name, var_GetAndSet(), and VLC_VAR_INTEGER_OR.

var_Set()

int var_Set	(	vlc_object_t *	obj,
		const char *	name,
		vlc_value_t	val
	)

Sets a variable value.

Parameters

obj	Object holding the variable
name	Variable name
val	Variable value to set

References psz_name, and var_SetChecked().

Referenced by config_ChainParse(), TriggerFilterCallback(), var_Copy(), var_CopyDevice(), and var_OptionParse().

var_SetAddress()

static int var_SetAddress ( vlc_object_t *  p_obj, const char *  psz_name, void *  ptr  )

inlinestatic

Set the value of a pointer variable.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable
ptr	The new pointer value of this variable

References vlc_value_t::p_address, psz_name, var_SetChecked(), and VLC_VAR_ADDRESS.

Referenced by extension_DialogCommand(), input_item_ApplyOptions(), system_Configure(), Trigger(), TriggerInstanceState(), ViewpointApply(), vlc_mta_acquire(), vlc_mta_release(), and VoutViewpointMoved().

var_SetBool()

static int var_SetBool ( vlc_object_t *  p_obj, const char *  psz_name, bool  b  )

inlinestatic

Set the value of an boolean variable.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable
b	The new boolean value of this variable

References vlc_value_t::b_bool, psz_name, var_SetChecked(), and VLC_VAR_BOOL.

Referenced by aout_MuteNotify(), config_LoadCmdLine(), config_PrintHelp(), Init(), InitSout(), vlc_input_decoder_SetVbiOpaque(), vlc_player_SetTrackCategoryEnabled(), vlc_player_Start(), vlc_playlist_SetMediaStoppedAction(), vout_display_window_FullscreenNotify(), vout_display_window_WindowingNotify(), vout_OpenWrapper(), vout_ReinitInterlacingSupport(), and vout_SetInterlacingState().

var_SetChecked()

int var_SetChecked	(	vlc_object_t *	p_this,
		const char *	psz_name,
		int	expected_type,
		vlc_value_t	val
	)

References CheckValue(), variable_t::i_type, Lookup(), variable_t::ops, variable_ops_t::pf_dup, variable_ops_t::pf_free, psz_name, TriggerCallback(), variable_t::val, vlc_object_internals::var_lock, VLC_ENOENT, vlc_internals, vlc_mutex_unlock(), VLC_SUCCESS, VLC_VAR_CLASS, VLC_VAR_VOID, and WaitUnused().

Referenced by var_Set(), var_SetAddress(), var_SetBool(), var_SetCoords(), var_SetFloat(), var_SetInteger(), var_SetString(), vlc_player_New(), and vlc_player_vout_SetVar().

var_SetCoords()

static int var_SetCoords ( vlc_object_t *  obj, const char *  name, int32_t  x, int32_t  y  )

inlinestatic

References vlc_value_t::coords, name, var_SetChecked(), VLC_VAR_COORDS, vlc_value_t::x, and vlc_value_t::y.

Referenced by vout_display_window_MouseEvent().

var_SetFloat()

static int var_SetFloat ( vlc_object_t *  p_obj, const char *  psz_name, float  f  )

inlinestatic

Set the value of a float variable.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable
f	The new float value of this variable

References vlc_value_t::f_float, psz_name, var_SetChecked(), and VLC_VAR_FLOAT.

Referenced by aout_Destroy(), aout_VolumeNotify(), config_LoadCmdLine(), SetSubtitlesOptions(), vlc_player_ChangeRate(), vlc_player_input_RestoreMlStates(), and vlc_player_SetAssociatedSubsFPS().

var_SetInteger()

static int var_SetInteger ( vlc_object_t *  p_obj, const char *  psz_name, int64_t  i  )

inlinestatic

Set the value of an integer variable.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable
i	The new integer value of this variable

References vlc_value_t::i_int, psz_name, var_SetChecked(), and VLC_VAR_INTEGER.

Referenced by config_LoadCmdLine(), Init(), MainLoopTryRepeat(), vlc_input_decoder_SetVbiPage(), vlc_key_to_action(), vlc_player_input_RestoreMlStates(), vlc_player_SetSubtitleTextScale(), vout_CreateVars(), vout_display_window_KeyboardEvent(), vout_display_window_MouseEvent(), vout_display_window_StateNotify(), vout_InitInterlacingSupport(), and VoutSaveSnapshot().

var_SetString()

static int var_SetString ( vlc_object_t *  p_obj, const char *  psz_name, const char *  psz_string  )

inlinestatic

Set the value of a string variable.

Parameters

p_obj	The object that holds the variable
psz_name	The name of the variable
psz_string	The new string value of this variable

References psz_name, vlc_value_t::psz_string, var_SetChecked(), and VLC_VAR_STRING.

Referenced by aout_DeviceNotify(), aout_EnableFilter(), aout_New(), config_LoadCmdLine(), CropBorderCallback(), DeinterlaceCallback(), demux_NewAdvanced(), Init(), InputSourceInit(), libvlc_InternalInit(), LoadSlaves(), module_need(), OpenURL(), VisualizationCallback(), vlc_filter_LoadModule(), vlc_player_input_RestoreMlStates(), vlc_player_SelectCategoryLanguage(), vout_Create(), vout_display_window_FullscreenNotify(), and VoutSaveSnapshot().

var_ToggleBool()

static bool var_ToggleBool ( vlc_object_t *  p_obj, const char *  psz_name  )

inlinestatic

References vlc_value_t::b_bool, psz_name, var_GetAndSet(), and VLC_VAR_BOOL_TOGGLE.

Referenced by vout_display_window_MouseEvent().

var_TriggerCallback()

void var_TriggerCallback	(	vlc_object_t *	obj,
		const char *	name
	)

Triggers callbacks on a variable.

This triggers any callbacks registered on the named variable without actually modifying the variable value. This is primarily useful for variables with VLC_VAR_VOID type (which do not have a value).

Parameters

obj	Object holding the variable
name	Variable name

References Lookup(), psz_name, TriggerCallback(), variable_t::val, vlc_object_internals::var_lock, vlc_internals, vlc_mutex_unlock(), and WaitUnused().

Referenced by aout_volume_New(), ModuleThread_UpdateAudioFormat(), vlc_player_vout_TriggerOption(), vout_IntfReinit(), and WallPaperCallback().

var_Type()

int var_Type	(	vlc_object_t *	obj,
		const char *	name
	)

Get the type of a variable.

See also

Variable types

Returns

The variable type if it exists or 0 if the variable could not be found.

References variable_t::choices_count, variable_t::i_type, i_type, Lookup(), psz_name, vlc_object_internals::var_lock, vlc_internals, vlc_mutex_unlock(), and VLC_VAR_HASCHOICE.

Referenced by DecoderHasVbi(), filter_AddProxyCallbacks(), filter_DelProxyCallbacks(), Init(), and vlc_player_GetV4l2Object().