#[repr(transparent)]
pub struct ElementFactory { /* private fields */ }
Expand description

ElementFactory is used to create instances of elements. A GstElementFactory can be added to a Plugin as it is also a PluginFeature.

Use the find() and create() functions to create element instances or use make() as a convenient shortcut.

The following code example shows you how to create a GstFileSrc element.

Using an element factory

⚠️ The following code is in C ⚠️

  #include <gst/gst.h>

  GstElement *src;
  GstElementFactory *srcfactory;

  gst_init (&argc, &argv);

  srcfactory = gst_element_factory_find ("filesrc");
  g_return_if_fail (srcfactory != NULL);
  src = gst_element_factory_create (srcfactory, "src");
  g_return_if_fail (src != NULL);
  ...

Implements

PluginFeatureExt, GstObjectExt, glib::ObjectExt, PluginFeatureExtManual

Implementations

Checks if the factory can sink all possible capabilities.

caps

the caps to check

Returns

true if the caps are fully compatible.

Checks if the factory can sink any possible capability.

caps

the caps to check

Returns

true if the caps have a common subset.

Checks if the factory can src all possible capabilities.

caps

the caps to check

Returns

true if the caps are fully compatible.

Checks if the factory can src any possible capability.

caps

the caps to check

Returns

true if the caps have a common subset.

Create a new element of the type defined by the given elementfactory. It will be given the name supplied, since all elements require a name as their first argument.

name

name of new element, or None to automatically create a unique name

Returns

new Element or None if the element couldn’t be created

Get the GType for elements managed by this factory. The type can only be retrieved if the element factory is loaded, which can be assured with PluginFeatureExtManual::load().

Returns

the GType for elements managed by this factory or 0 if the factory is not loaded.

Get the available keys for the metadata on self.

Returns

a None-terminated array of key strings, or None when there is no metadata. Free with g_strfreev() when no longer needed.

Gets the number of pad_templates in this factory.

Returns

the number of pad_templates

This is supported on crate feature v1_20 only.

Queries whether registered element managed by self needs to be excluded from documentation system or not.

Returns

true if documentation should be skipped

Gets a None-terminated array of protocols this element supports or None if no protocols are supported. You may not change the contents of the returned array, as it is still owned by the element factory. Use g_strdupv() to make a copy of the protocol string array if you need to.

Returns

the supported protocols or None

Gets the type of URIs the element supports or URIType::Unknown if none.

Returns

type of URIs this element supports

Check if self implements the interface with name interfacename.

interfacename

an interface name

Returns

true when self implement the interface.

Search for an element factory of the given name. Refs the returned element factory; caller is responsible for unreffing.

name

name of factory to find

Returns

ElementFactory if found, None otherwise

Create a new element of the type defined by the given element factory. If name is None, then the element will receive a guaranteed unique name, consisting of the element factory name and a number. If name is given, it will be given the name supplied.

factoryname

a named factory to instantiate

name

name of new element, or None to automatically create a unique name

Returns

new Element or None if unable to create element

This is supported on crate feature v1_20 only.

Create a new element of the type defined by the given elementfactory. The supplied list of properties, will be passed at object construction.

names

array of properties names

values

array of associated properties values

Returns

new Element or None if the element couldn’t be created

This is supported on crate feature v1_20 only.

Create a new element of the type defined by the given elementfactory. The supplied list of properties, will be passed at object construction.

factoryname

a named factory to instantiate

names

array of properties names

values

array of associated properties values

Returns

new Element or None if the element couldn’t be created

Gets the GList of StaticPadTemplate for this factory.

Returns

the static pad templates

Check if self is of the given types.

type_

a GstElementFactoryListType

Returns

true if self is of type_.

Get a list of factories that match the given type_. Only elements with a rank greater or equal to minrank will be returned. The list of factories is returned by decreasing rank.

type_

a GstElementFactoryListType

minrank

Minimum rank

Returns

a GList of ElementFactory elements. Use gst_plugin_feature_list_free() after usage.

Get the metadata on self with key.

key

a key

Returns

the metadata with key on self or None when there was no metadata with the given key.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

Restrict a value to a certain interval. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

Returns the type identifier of Self.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Upcasts an object to a superclass or interface T. Read more

Upcasts an object to a reference of its superclass or interface T. Read more

Tries to downcast to a subclass or interface implementor T. Read more

Tries to downcast to a reference of its subclass or interface implementor T. Read more

Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

Casts to T unconditionally. Read more

Casts to &T unconditionally. Read more

Performs the conversion.

Performs the conversion.

Returns true if the object is an instance of (can be cast to) T.

Returns the type of the object.

Returns the ObjectClass of the object. Read more

Returns the class of the object.

Returns the class of the object in the given type T. Read more

Returns the interface T of the object. Read more

Similar to Self::set_property but fails instead of panicking.

Sets the property property_name of the object to value value. Read more

Similar to Self::set_property but fails instead of panicking.

Sets the property property_name of the object to value value. Read more

Similar to Self::set_properties but fails instead of panicking.

Sets multiple properties of the object at once. Read more

Similar to Self::set_properties_from_value but fails instead of panicking.

Sets multiple properties of the object at once. Read more

Similar to Self::property but fails instead of panicking.

Gets the property property_name of the object and cast it to the type V. Read more

Similar to Self::property_value but fails instead of panicking.

Gets the property property_name of the object. Read more

Check if the object has a property property_name of the given type_. Read more

Get the type of the property property_name of this object. Read more

Get the ParamSpec of the property property_name of this object.

Return all ParamSpec of the properties of this object.

Freeze all property notifications until the return guard object is dropped. Read more

Set arbitrary data on this object with the given key. Read more

Return previously set arbitrary data of this object with the given key. Read more

Retrieve previously set arbitrary data of this object with the given key. Read more

Set arbitrary data on this object with the given key. Read more

Return previously set arbitrary data of this object with the given key. Read more

Retrieve previously set arbitrary data of this object with the given key. Read more

Block a given signal handler. Read more

Unblock a given signal handler.

Stop emission of the currently emitted signal.

Stop emission of the currently emitted signal by the (possibly detailed) signal name.

Similar to Self::connect but fails instead of panicking.

Connect to the signal signal_name on this object. Read more

Similar to Self::connect_id but fails instead of panicking.

Connect to the signal signal_id on this object. Read more

Similar to Self::connect_local but fails instead of panicking.

Connect to the signal signal_name on this object. Read more

Similar to Self::connect_local_id but fails instead of panicking.

Connect to the signal signal_id on this object. Read more

Similar to Self::connect_unsafe but fails instead of panicking.

Connect to the signal signal_name on this object. Read more

Similar to Self::connect_unsafe_id but fails instead of panicking.

Similar to Self::connect_closure but fails instead of panicking.

Connect a closure to the signal signal_name on this object. Read more

Similar to Self::connect_closure_id but fails instead of panicking.

Connect a closure to the signal signal_id on this object. Read more

Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to Closure::invoke. Read more

Connect to the signal signal_id on this object. Read more

Similar to Self::emit but fails instead of panicking.

Emit signal by signal id. Read more

Similar to Self::emit_with_values but fails instead of panicking.

Same as Self::emit but takes Value for the arguments.

Similar to Self::emit_by_name but fails instead of panicking.

Emit signal by its name. Read more

Similar to Self::emit_by_name_with_values but fails instead of panicking.

Emit signal by its name. Read more

Similar to Self::emit_by_name_with_details but fails instead of panicking.

Emit signal by its name with details. Read more

Similar to Self::emit_by_name_with_details_and_values but fails instead of panicking.

Emit signal by its name with details. Read more

Similar to Self::emit_with_details but fails instead of panicking.

Emit signal by signal id with details. Read more

Similar to Self::emit_with_details_and_values but fails instead of panicking.

Emit signal by signal id with details. Read more

Disconnect a previously connected signal handler.

Connect to the notify signal of the object. Read more

Connect to the notify signal of the object. Read more

Connect to the notify signal of the object. Read more

Notify that the given property has changed its value. Read more

Notify that the given property has changed its value. Read more

Downgrade this object to a weak reference.

Bind property source_property on this object to the target_property on the target object. Read more

Returns the strong reference count of this object.

Ensures that the type has been registered with the type system.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

Returns a SendValue clone of self.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.