Gst.ElementFactory¶

Subclasses:: None

Methods¶

Inherited:: Gst.PluginFeature (10), Gst.Object (27), GObject.Object (37)
Structs:: GObject.ObjectClass (5)

class	`find` (name)
class	`list_filter` (list, caps, direction, subsetonly)
class	`list_get_elements` (type, minrank)
class	`make` (factoryname, name)
class	`make_with_properties` (factoryname, names, values)
	`can_sink_all_caps` (caps)
	`can_sink_any_caps` (caps)
	`can_src_all_caps` (caps)
	`can_src_any_caps` (caps)
	`create` (name)
	`create_with_properties` (names, values)
	`get_element_type` ()
	`get_metadata` (key)
	`get_metadata_keys` ()
	`get_num_pad_templates` ()
	`get_skip_documentation` ()
	`get_static_pad_templates` ()
	`get_uri_protocols` ()
	`get_uri_type` ()
	`has_interface` (interfacename)
	`list_is_type` (type)

Virtual Methods¶

Inherited:: Gst.Object (1), GObject.Object (7)

Properties¶

Inherited:: Gst.Object (2)

Signals¶

Inherited:: Gst.Object (1), GObject.Object (1)

Fields¶

Inherited:: Gst.Object (1), GObject.Object (1)

Class Details¶

class Gst.ElementFactory(**kwargs)¶

Bases:: Gst.PluginFeature
Abstract:: No
Structure:: Gst.ElementFactoryClass

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

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

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

Using an element factory

#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);
...

classmethod find(name)[source]¶

Parameters:: name (str) – name of factory to find
Returns:: Gst.ElementFactory if found, None otherwise
Return type:: Gst.ElementFactory or None

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

classmethod list_filter(list, caps, direction, subsetonly)[source]¶

Parameters:

list ([Gst.ElementFactory]) – a GLib.List of Gst.ElementFactory to filter
caps (Gst.Caps) – a Gst.Caps
direction (Gst.PadDirection) – a Gst.PadDirection to filter on
subsetonly (bool) – whether to filter on caps subsets or not.

Returns:

a GLib.List of Gst.ElementFactory elements that match the given requisites. Use Gst.PluginFeature.list_free after usage.

Return type:

[Gst.ElementFactory]

Filter out all the elementfactories in list that can handle caps in the given direction.

If subsetonly is True, then only the elements whose pads templates are a complete superset of caps will be returned. Else any element whose pad templates caps can intersect with caps will be returned.

classmethod list_get_elements(type, minrank)[source]¶

Parameters:

type (int) – a #GstElementFactoryListType
minrank (Gst.Rank) – Minimum rank

Returns:

a GLib.List of Gst.ElementFactory elements. Use Gst.PluginFeature.list_free() after usage.

Return type:

[Gst.ElementFactory]

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.

classmethod make(factoryname, name)[source]¶

Parameters:

factoryname (str) – a named factory to instantiate
name (str or None) – name of new element, or None to automatically create a unique name

Returns:

new Gst.Element or None if unable to create element

Return type:

Gst.Element or None

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.

classmethod make_with_properties(factoryname, names, values)[source]¶

Parameters:

factoryname (str) – a named factory to instantiate
names ([str] or None) – array of properties names
values ([GObject.Value] or None) – array of associated properties values

Returns:

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

Return type:

Gst.Element or None

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

New in version 1.20.

can_sink_all_caps(caps)[source]¶

Parameters:: caps (Gst.Caps) – the caps to check
Returns:: True if the caps are fully compatible.
Return type:: bool

Checks if the factory can sink all possible capabilities.

can_sink_any_caps(caps)[source]¶

Parameters:: caps (Gst.Caps) – the caps to check
Returns:: True if the caps have a common subset.
Return type:: bool

Checks if the factory can sink any possible capability.

can_src_all_caps(caps)[source]¶

Parameters:: caps (Gst.Caps) – the caps to check
Returns:: True if the caps are fully compatible.
Return type:: bool

Checks if the factory can src all possible capabilities.

can_src_any_caps(caps)[source]¶

Parameters:: caps (Gst.Caps) – the caps to check
Returns:: True if the caps have a common subset.
Return type:: bool

Checks if the factory can src any possible capability.

create(name)[source]¶

Parameters:: name (str or None) – name of new element, or None to automatically create a unique name
Returns:: new Gst.Element or None if the element couldn’t be created
Return type:: Gst.Element or None

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.

create_with_properties(names, values)[source]¶

Parameters:

names ([str] or None) – array of properties names
values ([GObject.Value] or None) – array of associated properties values

Returns:

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

Return type:

Gst.Element or None

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

New in version 1.20.

get_element_type()[source]¶

Returns:: the GObject.GType for elements managed by this factory or 0 if the factory is not loaded.
Return type:: GObject.GType

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

get_metadata(key)[source]¶

Parameters:: key (str) – a key
Returns:: the metadata with key on self or None when there was no metadata with the given key.
Return type:: str or None

Get the metadata on self with key.

get_metadata_keys()[source]¶

Returns:: a None-terminated array of key strings, or None when there is no metadata. Free with GLib.strfreev() when no longer needed.
Return type:: [str] or None

Get the available keys for the metadata on self.

get_num_pad_templates()[source]¶

Returns:: the number of pad_templates
Return type:: int

Gets the number of pad_templates in this factory.

get_skip_documentation()[source]¶

Returns:: True if documentation should be skipped
Return type:: bool

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

New in version 1.20.

get_static_pad_templates()[source]¶

Returns:: the static pad templates
Return type:: [Gst.StaticPadTemplate]

Gets the GLib.List of Gst.StaticPadTemplate for this factory.

get_uri_protocols()[source]¶

Returns:: the supported protocols or None
Return type:: [str]

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.

get_uri_type()[source]¶

Returns:: type of URIs this element supports
Return type:: Gst.URIType

Gets the type of URIs the element supports or Gst.URIType.UNKNOWN if none.

has_interface(interfacename)[source]¶

Parameters:: interfacename (str) – an interface name
Returns:: True when self implement the interface.
Return type:: bool

Check if self implements the interface with name interfacename.

list_is_type(type)[source]¶

Parameters:: type (int) – a #GstElementFactoryListType
Returns:: True if self is of type.
Return type:: bool

Check if self is of the given types.