ObjectGst

#GstObject provides a root for the object hierarchy tree filed in by the GStreamer library. It is currently a thin wrapper on top of #GInitiallyUnowned. It is an abstract class that is not very usable on its own.

#GstObject gives us basic refcounting, parenting functionality and locking. Most of the functions are just extended for special GStreamer needs and can be found under the same name in the base class of #GstObject which is #GObject (e.g. g_object_ref() becomes gst_object_ref()).

Since #GstObject derives from #GInitiallyUnowned, it also inherits the floating reference. Be aware that functions such as gst_bin_add() and gst_element_add_pad() take ownership of the floating reference.

In contrast to #GObject instances, #GstObject adds a name property. The functions gst_object_set_name() and gst_object_get_name() are used to set/get the name of the object.

<refsect2> <title>controlled properties</title> <para> Controlled properties offers a lightweight way to adjust gobject properties over stream-time. It works by using time-stamped value pairs that are queued for element-properties. At run-time the elements continuously pull value changes for the current stream-time.

What needs to be changed in a #GstElement? Very little - it is just two steps to make a plugin controllable! <orderedlist> <listitem><para> mark gobject-properties paramspecs that make sense to be controlled, by GST_PARAM_CONTROLLABLE. </para></listitem> <listitem><para> when processing data (get, chain, loop function) at the beginning call gst_object_sync_values(element,timestamp). This will make the controller update all GObject properties that are under its control with the current values based on the timestamp. </para></listitem> </orderedlist>

What needs to be done in applications? Again it's not a lot to change. <orderedlist> <listitem><para> create a #GstControlSource. csource = gst_interpolation_control_source_new (); g_object_set (csource, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL); </para></listitem> <listitem><para> Attach the #GstControlSource on the controller to a property. gst_object_add_control_binding (object, gst_direct_control_binding_new (object, "prop1", csource)); </para></listitem> <listitem><para> Set the control values gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,0 * GST_SECOND, value1); gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,1 * GST_SECOND, value2); </para></listitem> <listitem><para> start your pipeline </para></listitem> </orderedlist> </para> </refsect2>

class ObjectGst : ObjectG {}

Constructors

this
this(GstObject* gstObject, bool ownedRef)

Sets our main struct and passes it to the parent class.

Members

Functions

addControlBinding
bool addControlBinding(ControlBinding binding)

Attach the #GstControlBinding to the object. If there already was a #GstControlBinding for this property it will be replaced.

addOnDeepNotify
void addOnDeepNotify(void delegate(ObjectGst, ParamSpec, ObjectGst) dlg, ConnectFlags connectFlags)

The deep notify signal is used to be notified of property changes. It is typically attached to the toplevel bin to receive notifications from all the elements contained in that bin.

defaultError
void defaultError(ErrorG error, string dbg)

A default error function that uses g_printerr() to display the error message and the optional debug sting..

doref
ObjectGst doref()

Increments the reference count on @object. This function does not take the lock on @object because it relies on atomic refcounting.

getControlBinding
ControlBinding getControlBinding(string propertyName)

Gets the corresponding #GstControlBinding for the property. This should be unreferenced again after use.

getControlRate
GstClockTime getControlRate()

Obtain the control-rate for this @object. Audio processing #GstElement objects will use this rate to sub-divide their processing loop and call gst_object_sync_values() inbetween. The length of the processing segment should be up to @control-rate nanoseconds.

getGValueArray
bool getGValueArray(string propertyName, GstClockTime timestamp, GstClockTime interval, uint nValues, Value values)

Gets a number of #GValues for the given controlled property starting at the requested time. The array @values need to hold enough space for @n_values of #GValue.

getName
string getName()

Returns a copy of the name of @object. Caller should g_free() the return value after usage. For a nameless object, this returns %NULL, which you can safely g_free() as well.

getObjectGstStruct
GstObject* getObjectGstStruct()

Get the main Gtk struct

getParent
ObjectGst getParent()

Returns the parent of @object. This function increases the refcount of the parent object so you should gst_object_unref() it after usage.

getPathString
string getPathString()

Generates a string describing the path of @object in the object hierarchy. Only useful (or used) for debugging.

getStruct
void* getStruct()

the main Gtk struct as a void*

getValue
Value getValue(string propertyName, GstClockTime timestamp)

Gets the value for the given controlled property at the requested time.

getValueArray
bool getValueArray(string propertyName, GstClockTime timestamp, GstClockTime interval, uint nValues, void* values)

Gets a number of values for the given controlled property starting at the requested time. The array @values need to hold enough space for @n_values of the same type as the objects property's type.

hasActiveControlBindings
bool hasActiveControlBindings()

Check if the @object has an active controlled properties.

hasAncestor
bool hasAncestor(ObjectGst ancestor)

Check if @object has an ancestor @ancestor somewhere up in the hierarchy. One can e.g. check if a #GstElement is inside a #GstPipeline.

removeControlBinding
bool removeControlBinding(ControlBinding binding)

Removes the corresponding #GstControlBinding. If it was the last ref of the binding, it will be disposed.

setControlBindingDisabled
void setControlBindingDisabled(string propertyName, bool disabled)

This function is used to disable the control bindings on a property for some time, i.e. gst_object_sync_values() will do nothing for the property.

setControlBindingsDisabled
void setControlBindingsDisabled(bool disabled)

This function is used to disable all controlled properties of the @object for some time, i.e. gst_object_sync_values() will do nothing.

setControlRate
void setControlRate(GstClockTime controlRate)

Change the control-rate for this @object. Audio processing #GstElement objects will use this rate to sub-divide their processing loop and call gst_object_sync_values() inbetween. The length of the processing segment should be up to @control-rate nanoseconds.

setName
bool setName(string name)

Sets the name of @object, or gives @object a guaranteed unique name (if @name is %NULL). This function makes a copy of the provided name, so the caller retains ownership of the name it sent.

setParent
bool setParent(ObjectGst parent)

Sets the parent of @object to @parent. The object's reference count will be incremented, and any floating reference will be removed (see gst_object_ref_sink()).

setStruct
void setStruct(GObject* obj)
Undocumented in source. Be warned that the author may not have intended to support it.
suggestNextSync
GstClockTime suggestNextSync()

Returns a suggestion for timestamps where buffers should be split to get best controller results.

syncValues
bool syncValues(GstClockTime timestamp)

Sets the properties of the object, according to the #GstControlSources that (maybe) handle them and for the given timestamp.

unparent
void unparent()

Clear the parent of @object, removing the associated reference. This function decreases the refcount of @object.

unref
void unref()

Decrements the reference count on @object. If reference count hits zero, destroy @object. This function does not take the lock on @object as it relies on atomic refcounting.

Static functions

callBackDeepNotify
void callBackDeepNotify(GstObject* objectgstStruct, GstObject* propObject, GParamSpec* prop, ObjectGst _objectgst)
Undocumented in source. Be warned that the author may not have intended to support it.
checkUniqueness
bool checkUniqueness(ListG list, string name)

Checks to see if there is any object named @name in @list. This function does not do any locking of any kind. You might want to protect the provided list with the lock of the owner of the list. This function will lock each #GstObject in the list to compare the name, so be careful when passing a list with a locked object.

defaultDeepNotify
void defaultDeepNotify(ObjectG object, ObjectGst orig, ParamSpec pspec, string[] excludedProps)

A default deep_notify signal callback for an object. The user data should contain a pointer to an array of strings that should be excluded from the notify. The default handler will print the new value of the property using g_print.

getType
GType getType()
refSink
void* refSink(void* object)

Increase the reference count of @object, and possibly remove the floating reference, if @object has a floating reference.

replace
bool replace(ObjectGst oldobj, ObjectGst newobj)

Atomically modifies a pointer to point to a new object. The reference count of @oldobj is decreased and the reference count of @newobj is increased.

Variables

connectedSignals
int[string] connectedSignals;
Undocumented in source.
gstObject
GstObject* gstObject;

the main Gtk struct

onDeepNotifyListeners
void delegate(ObjectGst, ParamSpec, ObjectGst)[] onDeepNotifyListeners;
Undocumented in source.

Inherited Members

From ObjectG

gObject
GObject* gObject;

the main Gtk struct

getObjectGStruct
GObject* getObjectGStruct()

Get the main Gtk struct

getStruct
void* getStruct()

the main Gtk struct as a void*

isGcRoot
bool isGcRoot;
Undocumented in source.
destroyNotify
void destroyNotify(ObjectG obj)
Undocumented in source. Be warned that the author may not have intended to support it.
toggleNotify
void toggleNotify(ObjectG obj, GObject* object, int isLastRef)
Undocumented in source. Be warned that the author may not have intended to support it.
~this
~this()
Undocumented in source.
getDObject
RT getDObject(U obj, bool ownedRef)

Gets a D Object from the objects table of associations.

setStruct
void setStruct(GObject* obj)
Undocumented in source. Be warned that the author may not have intended to support it.
setProperty
void setProperty(string propertyName, int value)
setProperty
void setProperty(string propertyName, string value)
setProperty
void setProperty(string propertyName, long value)
setProperty
void setProperty(string propertyName, ulong value)
unref
deprecated void unref(ObjectG obj)
Undocumented in source. Be warned that the author may not have intended to support it.
doref
deprecated ObjectG doref(ObjectG obj)
Undocumented in source. Be warned that the author may not have intended to support it.
connectedSignals
int[string] connectedSignals;
Undocumented in source.
onNotifyListeners
void delegate(ParamSpec, ObjectG)[] onNotifyListeners;
Undocumented in source.
addOnNotify
void addOnNotify(void delegate(ParamSpec, ObjectG) dlg, string property, ConnectFlags connectFlags)

The notify signal is emitted on an object when one of its properties has been changed. Note that getting this signal doesn't guarantee that the value of the property has actually changed, it may also be emitted when the setter for the property is called to reinstate the previous value.

callBackNotify
void callBackNotify(GObject* gobjectStruct, GParamSpec* pspec, ObjectG _objectG)
Undocumented in source. Be warned that the author may not have intended to support it.
getType
GType getType()
compatControl
size_t compatControl(size_t what, void* data)
Undocumented in source. Be warned that the author may not have intended to support it.
interfaceFindProperty
ParamSpec interfaceFindProperty(void* gIface, string propertyName)

Find the #GParamSpec with the given name for an interface. Generally, the interface vtable passed in as @g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().

interfaceInstallProperty
void interfaceInstallProperty(void* gIface, ParamSpec pspec)

Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.

interfaceListProperties
ParamSpec[] interfaceListProperties(void* gIface)

Lists the properties of an interface.Generally, the interface vtable passed in as @g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().

addToggleRef
void addToggleRef(GToggleNotify notify, void* data)

Increases the reference count of the object by one and sets a callback to be called when all other references to the object are dropped, or when this is already the last reference to the object and another reference is established.

addWeakPointer
void addWeakPointer(void* weakPointerLocation)

Adds a weak reference from weak_pointer to @object to indicate that the pointer located at @weak_pointer_location is only valid during the lifetime of @object. When the @object is finalized, @weak_pointer will be set to %NULL.

bindProperty
Binding bindProperty(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags)

Creates a binding between @source_property on @source and @target_property on @target. Whenever the @source_property is changed the @target_property is updated using the same value. For instance:

bindPropertyFull
Binding bindPropertyFull(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, GBindingTransformFunc transformTo, GBindingTransformFunc transformFrom, void* userData, GDestroyNotify notify)

Complete version of g_object_bind_property().

bindPropertyWithClosures
Binding bindPropertyWithClosures(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, Closure transformTo, Closure transformFrom)

Creates a binding between @source_property on @source and @target_property on @target, allowing you to set the transformation functions to be used by the binding.

dupData
void* dupData(string key, GDuplicateFunc dupFunc, void* userData)

This is a variant of g_object_get_data() which returns a 'duplicate' of the value. @dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.

dupQdata
void* dupQdata(GQuark quark, GDuplicateFunc dupFunc, void* userData)

This is a variant of g_object_get_qdata() which returns a 'duplicate' of the value. @dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.

forceFloating
void forceFloating()

This function is intended for #GObject implementations to re-enforce a floating[floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().

freezeNotify
void freezeNotify()

Increases the freeze count on @object. If the freeze count is non-zero, the emission of "notify" signals on @object is stopped. The signals are queued until the freeze count is decreased to zero. Duplicate notifications are squashed so that at most one #GObject::notify signal is emitted for each property modified while the object is frozen.

getData
void* getData(string key)

Gets a named field from the objects table of associations (see g_object_set_data()).

getProperty
void getProperty(string propertyName, Value value)

Gets a property of an object. @value must have been initialized to the expected type of the property (or a type to which the expected type can be transformed) using g_value_init().

getQdata
void* getQdata(GQuark quark)

This function gets back user data pointers stored via g_object_set_qdata().

getValist
void getValist(string firstPropertyName, void* varArgs)

Gets properties of an object.

isFloating
bool isFloating()

Checks whether @object has a floating[floating-ref] reference.

notify
void notify(string propertyName)

Emits a "notify" signal for the property @property_name on @object.

notifyByPspec
void notifyByPspec(ParamSpec pspec)

Emits a "notify" signal for the property specified by @pspec on @object.

doref
ObjectG doref()

Increases the reference count of @object.

refSink
ObjectG refSink()

Increase the reference count of @object, and possibly remove the floating[floating-ref] reference, if @object has a floating reference.

removeToggleRef
void removeToggleRef(GToggleNotify notify, void* data)

Removes a reference added with g_object_add_toggle_ref(). The reference count of the object is decreased by one.

removeWeakPointer
void removeWeakPointer(void* weakPointerLocation)

Removes a weak reference from @object that was previously added using g_object_add_weak_pointer(). The @weak_pointer_location has to match the one used with g_object_add_weak_pointer().

replaceData
bool replaceData(string key, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify* oldDestroy)

Compares the user data for the key @key on @object with @oldval, and if they are the same, replaces @oldval with @newval.

replaceQdata
bool replaceQdata(GQuark quark, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify* oldDestroy)

Compares the user data for the key @quark on @object with @oldval, and if they are the same, replaces @oldval with @newval.

runDispose
void runDispose()

Releases all references to other objects. This can be used to break reference cycles.

setData
void setData(string key, void* data)

Each object carries around a table of associations from strings to pointers. This function lets you set an association.

setDataFull
void setDataFull(string key, void* data, GDestroyNotify destroy)

Like g_object_set_data() except it adds notification for when the association is destroyed, either by setting it to a different value or when the object is destroyed.

setProperty
void setProperty(string propertyName, Value value)

Sets a property on an object.

setQdata
void setQdata(GQuark quark, void* data)

This sets an opaque, named pointer on an object. The name is specified through a #GQuark (retrived e.g. via g_quark_from_static_string()), and the pointer can be gotten back from the @object with g_object_get_qdata() until the @object is finalized. Setting a previously set user data pointer, overrides (frees) the old pointer set, using #NULL as pointer essentially removes the data stored.

setQdataFull
void setQdataFull(GQuark quark, void* data, GDestroyNotify destroy)

This function works like g_object_set_qdata(), but in addition, a void (*destroy) (gpointer) function may be specified which is called with @data as argument when the @object is finalized, or the data is being overwritten by a call to g_object_set_qdata() with the same @quark.

setValist
void setValist(string firstPropertyName, void* varArgs)

Sets properties on an object.

stealData
void* stealData(string key)

Remove a specified datum from the object's data associations, without invoking the association's destroy handler.

stealQdata
void* stealQdata(GQuark quark)

This function gets back user data pointers stored via g_object_set_qdata() and removes the @data from object without invoking its destroy() function (if any was set). Usually, calling this function is only required to update user data pointers with a destroy notifier, for example: |[<!-- language="C" --> void object_add_to_user_list (GObject *object, const gchar *new_string) { // the quark, naming the object data GQuark quark_string_list = g_quark_from_static_string ("my-string-list"); // retrive the old string list GList *list = g_object_steal_qdata (object, quark_string_list);

thawNotify
void thawNotify()

Reverts the effect of a previous call to g_object_freeze_notify(). The freeze count is decreased on @object and when it reaches zero, queued "notify" signals are emitted.

unref
void unref()

Decreases the reference count of @object. When its reference count drops to 0, the object is finalized (i.e. its memory is freed).

watchClosure
void watchClosure(Closure closure)

This function essentially limits the life time of the @closure to the life time of the object. That is, when the object is finalized, the @closure is invalidated by calling g_closure_invalidate() on it, in order to prevent invocations of the closure with a finalized (nonexisting) object. Also, g_object_ref() and g_object_unref() are added as marshal guards to the @closure, to ensure that an extra reference count is held on @object during invocation of the @closure. Usually, this function will be called on closures that use this @object as closure data.

weakRef
void weakRef(GWeakNotify notify, void* data)

Adds a weak reference callback to an object. Weak references are used for notification when an object is finalized. They are called "weak references" because they allow you to safely hold a pointer to an object without calling g_object_ref() (g_object_ref() adds a strong reference, that is, forces the object to stay alive).

weakUnref
void weakUnref(GWeakNotify notify, void* data)

Removes a weak reference callback to an object.

clearObject
void clearObject(ObjectG objectPtr)

Clears a reference to a #GObject.

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