ElementFactory

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

Use the Element.factoryFind and Element.factoryCreate functions to create element instances or use Element.factoryMake as a convenient shortcut.

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

Using an element factory

[include|include] &lt;gst/gst.h&gt;

GstElement *src;
GstElementFactory *srcfactory;

gst_init (&amp;argc, &amp;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);
...

class ElementFactory : PluginFeature {

protected

GstElementFactory* gstElementFactory;

GstElementFactory* getElementFactoryStruct(bool transferOwnership);

void* getStruct();

this(GstElementFactory* gstElementFactory, bool ownedRef);

static Element make(string factoryname);

static GType getType();

static ElementFactory find(string name);

static ListG listFilter(ListG list, Caps caps, GstPadDirection direction, bool subsetonly);

static ListG listGetElements(GstElementFactoryListType type, GstRank minrank);

static Element make(string factoryname, string name);

bool canSinkAllCaps(Caps caps);

bool canSinkAnyCaps(Caps caps);

bool canSrcAllCaps(Caps caps);

bool canSrcAnyCaps(Caps caps);

Element create(string name);

GType getElementType();

string getMetadata(string key);

string[] getMetadataKeys();

uint getNumPadTemplates();

ListG getStaticPadTemplates();

string[] getUriProtocols();

GstURIType getUriType();

bool hasInterface(string interfacename);

bool listIsType(GstElementFactoryListType type);

}

Constructors

this this(GstElementFactory* gstElementFactory, bool ownedRef): Sets our main struct and passes it to the parent class.

Members

Functions

canSinkAllCaps bool canSinkAllCaps(Caps caps): Checks if the factory can sink all possible capabilities.
canSinkAnyCaps bool canSinkAnyCaps(Caps caps): Checks if the factory can sink any possible capability.
canSrcAllCaps bool canSrcAllCaps(Caps caps): Checks if the factory can src all possible capabilities.
canSrcAnyCaps bool canSrcAnyCaps(Caps caps): Checks if the factory can src any possible capability.
create Element create(string name): 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.
getElementFactoryStruct GstElementFactory* getElementFactoryStruct(bool transferOwnership): Get the main Gtk struct
getElementType GType getElementType(): 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 Plugin.featureLoad.
getMetadata string getMetadata(string key): Get the metadata on factory with key.
getMetadataKeys string[] getMetadataKeys(): Get the available keys for the metadata on factory.
getNumPadTemplates uint getNumPadTemplates(): Gets the number of pad_templates in this factory.
getStaticPadTemplates ListG getStaticPadTemplates(): Gets the GList of gstreamer.StaticPadTemplate for this factory.
getStruct void* getStruct(): the main Gtk struct as a void*
getUriProtocols string[] getUriProtocols(): Gets a NULL-terminated array of protocols this element supports or NULL 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.
getUriType GstURIType getUriType(): Gets the type of URIs the element supports or GST_URI_UNKNOWN if none.
hasInterface bool hasInterface(string interfacename): Check if factory implements the interface with name interfacename.
listIsType bool listIsType(GstElementFactoryListType type): Check if factory is of the given types.

Static functions

find ElementFactory find(string name): Search for an element factory of the given name. Refs the returned element factory; caller is responsible for unreffing.
getType GType getType()
listFilter ListG listFilter(ListG list, Caps caps, GstPadDirection direction, bool subsetonly): Filter out all the elementfactories in list that can handle caps in the given direction.
listGetElements ListG listGetElements(GstElementFactoryListType type, GstRank minrank): 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.
make Element make(string factoryname): Create a new element of the type defined by the given element factory. The element will receive a guaranteed unique name, consisting of the element factory name and a number.
make Element make(string factoryname, string name): Create a new element of the type defined by the given element factory. If name is NULL, 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.

Variables

gstElementFactory GstElementFactory* gstElementFactory;: the main Gtk struct

Inherited Members

From PluginFeature

gstPluginFeature GstPluginFeature* gstPluginFeature;: the main Gtk struct
getPluginFeatureStruct GstPluginFeature* getPluginFeatureStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
getType GType getType()
listCopy ListG listCopy(ListG list): Copies the list of features. Caller should call gst_plugin_feature_list_free when done with the list.
listDebug void listDebug(ListG list): Debug the plugin feature names in list.
listFree void listFree(ListG list): Unrefs each member of list, then frees the list.
rankCompareFunc int rankCompareFunc(void* p1, void* p2): Compares the two given gstreamer.PluginFeature instances. This function can be used as a GCompareFunc when sorting by rank and then by name.
checkVersion bool checkVersion(uint minMajor, uint minMinor, uint minMicro): Checks whether the given plugin feature is at least the required version
getPlugin Plugin getPlugin(): Get the plugin that provides this feature.
getPluginName string getPluginName(): Get the name of the plugin that provides this feature.
getRank uint getRank(): Gets the rank of a plugin feature.
load PluginFeature load(): Loads the plugin containing feature if it's not already loaded. feature is unaffected; use the return value instead.
setRank void setRank(uint rank): Specifies a rank for a plugin feature, so that autoplugging uses the most appropriate feature.

gstreamer ElementFactory classes

ElementFactory