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GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstPluginFeature ╰── GstElementFactory
GstElementFactory is used to create instances of elements. A GstElementFactory can be added to a GstPlugin as it is also a GstPluginFeature.
Use the gst_element_factory_find() and gst_element_factory_create()
functions to create element instances or use gst_element_factory_make() as a
convenient shortcut.
The following code example shows you how to create a GstFileSrc element.
Example 4. Using an element factory
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#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); ... |
gboolean gst_element_register (GstPlugin *plugin,const gchar *name,guint rank,GType type);
Create a new elementfactory capable of instantiating objects of the
type
and add the factory to plugin
.
GstElementFactory *
gst_element_factory_find (const gchar *name);
Search for an element factory of the given name. Refs the returned element factory; caller is responsible for unreffing.
GType
gst_element_factory_get_element_type (GstElementFactory *factory);
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 gst_plugin_feature_load().
const gchar * gst_element_factory_get_metadata (GstElementFactory *factory,const gchar *key);
Get the metadata on factory
with key
.
the metadata with key
on factory
or NULL
when there was no metadata with the given key
.
[nullable]
gchar **
gst_element_factory_get_metadata_keys (GstElementFactory *factory);
Get the available keys for the metadata on factory
.
a NULL-terminated array of key strings, or NULL when there is no
metadata. Free with g_strfreev() when no longer needed.
[transfer full][element-type utf8][array zero-terminated=1][nullable]
guint
gst_element_factory_get_num_pad_templates
(GstElementFactory *factory);
Gets the number of pad_templates in this factory.
GstURIType
gst_element_factory_get_uri_type (GstElementFactory *factory);
Gets the type of URIs the element supports or GST_URI_UNKNOWN if none.
const gchar * const *
gst_element_factory_get_uri_protocols (GstElementFactory *factory);
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.
gboolean gst_element_factory_has_interface (GstElementFactory *factory,const gchar *interfacename);
Check if factory
implements the interface with name interfacename
.
GstElement * gst_element_factory_create (GstElementFactory *factory,const gchar *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.
factory |
factory to instantiate |
|
name |
name of new element, or |
[allow-none] |
GstElement * gst_element_factory_make (const gchar *factoryname,const gchar *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.
factoryname |
a named factory to instantiate |
|
name |
name of new element, or |
[allow-none] |
gboolean gst_element_factory_can_sink_all_caps (GstElementFactory *factory,const GstCaps *caps);
Checks if the factory can sink all possible capabilities.
gboolean gst_element_factory_can_src_all_caps (GstElementFactory *factory,const GstCaps *caps);
Checks if the factory can src all possible capabilities.
gboolean gst_element_factory_can_sink_any_caps (GstElementFactory *factory,const GstCaps *caps);
Checks if the factory can sink any possible capability.
gboolean gst_element_factory_can_src_any_caps (GstElementFactory *factory,const GstCaps *caps);
Checks if the factory can src any possible capability.
const GList *
gst_element_factory_get_static_pad_templates
(GstElementFactory *factory);
Gets the GList of GstStaticPadTemplate for this factory.
GList * gst_element_factory_list_filter (GList *list,const GstCaps *caps,GstPadDirection direction,gboolean subsetonly);
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.
list |
a GList of GstElementFactory to filter. |
[transfer none][element-type Gst.ElementFactory] |
caps |
a GstCaps |
|
direction |
a GstPadDirection to filter on |
|
subsetonly |
whether to filter on caps subsets or not. |
a GList of GstElementFactory elements that match the given requisites. Use gst_plugin_feature_list_free after usage.
[transfer full][element-type Gst.ElementFactory]
GList * gst_element_factory_list_get_elements (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.
a GList of
GstElementFactory elements. Use gst_plugin_feature_list_free() after
usage.
[transfer full][element-type Gst.ElementFactory]
gboolean gst_element_factory_list_is_type (GstElementFactory *factory,GstElementFactoryListType type);
Check if factory
is of the given types.
typedef struct _GstElementFactory GstElementFactory;
The opaque GstElementFactory data structure.
#define GST_ELEMENT_FACTORY_TYPE_ANY ((G_GUINT64_CONSTANT (1) << 49) - 1)
Elements of any of the defined GST_ELEMENT_FACTORY_LIST types
#define GST_ELEMENT_FACTORY_TYPE_AUDIOVIDEO_SINKS (GST_ELEMENT_FACTORY_TYPE_SINK | GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO | GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO | GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
All sinks handling audio, video or image media types
#define GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER (GST_ELEMENT_FACTORY_TYPE_ENCODER | GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
All encoders handling audio media types
#define GST_ELEMENT_FACTORY_TYPE_DECODABLE
All elements used to 'decode' streams (decoders, demuxers, parsers, depayloaders)
#define GST_ELEMENT_FACTORY_TYPE_DECODER (G_GUINT64_CONSTANT (1) << 0)
#define GST_ELEMENT_FACTORY_TYPE_DECRYPTOR (G_GUINT64_CONSTANT (1) << 10)
#define GST_ELEMENT_FACTORY_TYPE_DEMUXER (G_GUINT64_CONSTANT (1) << 5)
#define GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER (G_GUINT64_CONSTANT (1) << 8)
#define GST_ELEMENT_FACTORY_TYPE_ENCODER (G_GUINT64_CONSTANT (1) << 1)
#define GST_ELEMENT_FACTORY_TYPE_ENCRYPTOR (G_GUINT64_CONSTANT (1) << 11)
#define GST_ELEMENT_FACTORY_TYPE_FORMATTER (G_GUINT64_CONSTANT (1) << 9)
#define GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS (G_GUINT64_CONSTANT (1) << 48)
#define GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO (G_GUINT64_CONSTANT (1) << 50)
#define GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE (G_GUINT64_CONSTANT (1) << 51)
#define GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA (G_GUINT64_CONSTANT (1) << 53)
#define GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE (G_GUINT64_CONSTANT (1) << 52)
#define GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO (G_GUINT64_CONSTANT (1) << 49)
#define GST_ELEMENT_FACTORY_TYPE_MEDIA_ANY (~G_GUINT64_CONSTANT (0) << 48)
Elements matching any of the defined GST_ELEMENT_FACTORY_TYPE_MEDIA types
Note: Do not use this if you wish to not filter against any of the defined media types. If you wish to do this, simply don't specify any GST_ELEMENT_FACTORY_TYPE_MEDIA flag.
#define GST_ELEMENT_FACTORY_TYPE_PARSER (G_GUINT64_CONSTANT (1) << 6)
#define GST_ELEMENT_FACTORY_TYPE_PAYLOADER (G_GUINT64_CONSTANT (1) << 7)