*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstelementfactory
+ * @title: GstElementFactory
* @short_description: Create GstElements from a factory
* @see_also: #GstElement, #GstPlugin, #GstPluginFeature, #GstPadTemplate.
*
* #GstElementFactory is used to create instances of elements. A
- * GstElementfactory can be added to a #GstPlugin as it is also 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()
*
* The following code example shows you how to create a GstFileSrc element.
*
- * <example>
- * <title>Using an element factory</title>
- * <programlisting language="c">
+ * ## Using an element factory
+ * |[<!-- language="C" -->
* #include <gst/gst.h>
*
* GstElement *src;
* src = gst_element_factory_create (srcfactory, "src");
* g_return_if_fail (src != NULL);
* ...
- * </programlisting>
- * </example>
- *
- * Last reviewed on 2005-11-23 (0.9.5)
+ * ]|
*/
#include "gst_private.h"
#include "gstelement.h"
+#include "gstelementmetadata.h"
#include "gstinfo.h"
#include "gsturi.h"
#include "gstregistry.h"
+#include "gst.h"
#include "glib-compat-private.h"
GST_DEBUG_CATEGORY_STATIC (element_factory_debug);
#define GST_CAT_DEFAULT element_factory_debug
-static void gst_element_factory_class_init (GstElementFactoryClass * klass);
-static void gst_element_factory_init (GstElementFactory * factory);
static void gst_element_factory_finalize (GObject * object);
-void __gst_element_details_clear (GstElementDetails * dp);
static void gst_element_factory_cleanup (GstElementFactory * factory);
-static GstPluginFeatureClass *parent_class = NULL;
-
/* static guint gst_element_factory_signals[LAST_SIGNAL] = { 0 }; */
/* this is defined in gstelement.c */
-extern GQuark _gst_elementclass_factory;
+extern GQuark __gst_elementclass_factory;
#define _do_init \
{ \
{
GObjectClass *gobject_class = (GObjectClass *) klass;
- parent_class = g_type_class_peek_parent (klass);
-
- gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_element_factory_finalize);
+ gobject_class->finalize = gst_element_factory_finalize;
}
static void
GstElementFactory *factory = GST_ELEMENT_FACTORY (object);
gst_element_factory_cleanup (factory);
- G_OBJECT_CLASS (parent_class)->finalize (object);
+ G_OBJECT_CLASS (gst_element_factory_parent_class)->finalize (object);
}
/**
* Search for an element factory of the given name. Refs the returned
* element factory; caller is responsible for unreffing.
*
- * Returns: #GstElementFactory if found, NULL otherwise
+ * Returns: (transfer full) (nullable): #GstElementFactory if found,
+ * %NULL otherwise
*/
GstElementFactory *
gst_element_factory_find (const gchar * name)
g_return_val_if_fail (name != NULL, NULL);
- feature = gst_registry_find_feature (gst_registry_get_default (), name,
+ feature = gst_registry_find_feature (gst_registry_get (), name,
GST_TYPE_ELEMENT_FACTORY);
if (feature)
return GST_ELEMENT_FACTORY (feature);
return NULL;
}
-void
-__gst_element_details_clear (GstElementDetails * dp)
-{
- g_free (dp->longname);
- g_free (dp->klass);
- g_free (dp->description);
- g_free (dp->author);
- memset (dp, 0, sizeof (GstElementDetails));
-}
-
-#define VALIDATE_SET(__dest, __src, __entry) \
-G_STMT_START { \
- if (g_utf8_validate (__src->__entry, -1, NULL)) { \
- __dest->__entry = g_strdup (__src->__entry); \
- } else { \
- g_warning ("Invalid UTF-8 in " G_STRINGIFY (__entry) ": %s", \
- __src->__entry); \
- __dest->__entry = g_strdup ("[ERROR: invalid UTF-8]"); \
- } \
-} G_STMT_END
-
-void
-__gst_element_details_set (GstElementDetails * dest,
- const GstElementDetails * src)
-{
- VALIDATE_SET (dest, src, longname);
- VALIDATE_SET (dest, src, klass);
- VALIDATE_SET (dest, src, description);
- VALIDATE_SET (dest, src, author);
-}
-
-void
-__gst_element_details_copy (GstElementDetails * dest,
- const GstElementDetails * src)
-{
- __gst_element_details_clear (dest);
- __gst_element_details_set (dest, src);
-}
-
static void
gst_element_factory_cleanup (GstElementFactory * factory)
{
GList *item;
- __gst_element_details_clear (&factory->details);
+ if (factory->metadata) {
+ gst_structure_free ((GstStructure *) factory->metadata);
+ factory->metadata = NULL;
+ }
if (factory->type) {
factory->type = G_TYPE_INVALID;
}
for (item = factory->staticpadtemplates; item; item = item->next) {
GstStaticPadTemplate *templ = item->data;
- GstCaps *caps = (GstCaps *) & (templ->static_caps);
-
- g_free ((gchar *) templ->static_caps.string);
- /* FIXME: this is not threadsafe */
- if (caps->refcount == 1) {
- GstStructure *structure;
- guint i;
-
- for (i = 0; i < caps->structs->len; i++) {
- structure = (GstStructure *) gst_caps_get_structure (caps, i);
- gst_structure_set_parent_refcount (structure, NULL);
- gst_structure_free (structure);
- }
- g_ptr_array_free (caps->structs, TRUE);
- caps->refcount = 0;
- }
- g_free (templ);
+ gst_static_caps_cleanup (&templ->static_caps);
+ g_slice_free (GstStaticPadTemplate, templ);
}
g_list_free (factory->staticpadtemplates);
factory->staticpadtemplates = NULL;
factory->uri_protocols = NULL;
}
- g_list_foreach (factory->interfaces, (GFunc) g_free, NULL);
g_list_free (factory->interfaces);
factory->interfaces = NULL;
}
+#define CHECK_METADATA_FIELD(klass, name, key) \
+ G_STMT_START { \
+ const gchar *metafield = gst_element_class_get_metadata (klass, key); \
+ if (G_UNLIKELY (metafield == NULL || *metafield == '\0')) { \
+ g_warning ("Element factory metadata for '%s' has no valid %s field", name, key); \
+ goto detailserror; \
+ } \
+ } G_STMT_END;
+
/**
* gst_element_register:
- * @plugin: #GstPlugin to register the element with, or NULL for a static
- * element (note that passing NULL only works in GStreamer 0.10.13 and later)
+ * @plugin: (allow-none): #GstPlugin to register the element with, or %NULL for
+ * a static element.
* @name: name of elements of this type
* @rank: rank of element (higher rank means more importance when autoplugging)
* @type: GType of element to register
* Create a new elementfactory capable of instantiating objects of the
* @type and add the factory to @plugin.
*
- * Returns: TRUE, if the registering succeeded, FALSE on error
+ * Returns: %TRUE, if the registering succeeded, %FALSE on error
*/
gboolean
gst_element_register (GstPlugin * plugin, const gchar * name, guint rank,
g_return_val_if_fail (name != NULL, FALSE);
g_return_val_if_fail (g_type_is_a (type, GST_TYPE_ELEMENT), FALSE);
- registry = gst_registry_get_default ();
+ registry = gst_registry_get ();
/* check if feature already exists, if it exists there is no need to update it
- * when the registry is getting updated, outdated plugins and all there
- * feature are removed and readded.
+ * when the registry is getting updated, outdated plugins and all their
+ * features are removed and readded.
*/
existing_feature = gst_registry_lookup_feature (registry, name);
if (existing_feature) {
factory = GST_ELEMENT_FACTORY_CAST (existing_feature);
factory->type = type;
existing_feature->loaded = TRUE;
- g_type_set_qdata (type, _gst_elementclass_factory, factory);
+ g_type_set_qdata (type, __gst_elementclass_factory, factory);
gst_object_unref (existing_feature);
return TRUE;
}
factory =
- GST_ELEMENT_FACTORY_CAST (g_object_new (GST_TYPE_ELEMENT_FACTORY, NULL));
+ GST_ELEMENT_FACTORY_CAST (g_object_newv (GST_TYPE_ELEMENT_FACTORY, 0,
+ NULL));
gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
GST_LOG_OBJECT (factory, "Created new elementfactory for type %s",
g_type_name (type));
/* provide info needed during class structure setup */
- g_type_set_qdata (type, _gst_elementclass_factory, factory);
+ g_type_set_qdata (type, __gst_elementclass_factory, factory);
klass = GST_ELEMENT_CLASS (g_type_class_ref (type));
- if ((klass->details.longname == NULL) ||
- (klass->details.klass == NULL) || (klass->details.author == NULL))
- goto detailserror;
+
+ CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_LONGNAME);
+ CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_KLASS);
+ CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_DESCRIPTION);
+ CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_AUTHOR);
factory->type = type;
- __gst_element_details_copy (&factory->details, &klass->details);
+ factory->metadata = gst_structure_copy ((GstStructure *) klass->metadata);
+
for (item = klass->padtemplates; item; item = item->next) {
GstPadTemplate *templ = item->data;
GstStaticPadTemplate *newt;
+ gchar *caps_string = gst_caps_to_string (templ->caps);
- newt = g_new0 (GstStaticPadTemplate, 1);
+ newt = g_slice_new (GstStaticPadTemplate);
newt->name_template = g_intern_string (templ->name_template);
newt->direction = templ->direction;
newt->presence = templ->presence;
- newt->static_caps.string = gst_caps_to_string (templ->caps);
+ newt->static_caps.caps = NULL;
+ newt->static_caps.string = g_intern_string (caps_string);
factory->staticpadtemplates =
g_list_append (factory->staticpadtemplates, newt);
+
+ g_free (caps_string);
}
factory->numpadtemplates = klass->numpadtemplates;
GstURIHandlerInterface *iface = (GstURIHandlerInterface *)
g_type_interface_peek (klass, GST_TYPE_URI_HANDLER);
- if (!iface || (!iface->get_type && !iface->get_type_full) ||
- (!iface->get_protocols && !iface->get_protocols_full))
+ if (!iface || !iface->get_type || !iface->get_protocols)
goto urierror;
if (iface->get_type)
- factory->uri_type = iface->get_type ();
- else if (iface->get_type_full)
- factory->uri_type = iface->get_type_full (factory->type);
+ factory->uri_type = iface->get_type (factory->type);
if (!GST_URI_TYPE_IS_VALID (factory->uri_type))
goto urierror;
- if (iface->get_protocols)
- factory->uri_protocols = g_strdupv (iface->get_protocols ());
- else if (iface->get_protocols_full)
- factory->uri_protocols = iface->get_protocols_full (factory->type);
+ if (iface->get_protocols) {
+ const gchar *const *protocols;
+
+ protocols = iface->get_protocols (factory->type);
+ factory->uri_protocols = g_strdupv ((gchar **) protocols);
+ }
if (!factory->uri_protocols)
goto urierror;
}
if (plugin && plugin->desc.name) {
GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name;
+ GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
+ g_object_add_weak_pointer ((GObject *) plugin,
+ (gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
} else {
GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
+ GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
}
gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory), rank);
GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
detailserror:
{
- GST_WARNING_OBJECT (factory,
- "The GstElementDetails don't seem to have been set properly");
gst_element_factory_cleanup (factory);
return FALSE;
}
/**
* gst_element_factory_create:
* @factory: factory to instantiate
- * @name: name of new element
+ * @name: (allow-none): name of new element, or %NULL to automatically create
+ * a unique 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.
*
- * Returns: new #GstElement or NULL if the element couldn't be created
+ * Returns: (transfer floating) (nullable): new #GstElement or %NULL
+ * if the element couldn't be created
*/
GstElement *
gst_element_factory_create (GstElementFactory * factory, const gchar * name)
if (name)
GST_INFO ("creating element \"%s\" named \"%s\"",
- GST_PLUGIN_FEATURE_NAME (factory), GST_STR_NULL (name));
+ GST_OBJECT_NAME (factory), GST_STR_NULL (name));
else
- GST_INFO ("creating element \"%s\"", GST_PLUGIN_FEATURE_NAME (factory));
+ GST_INFO ("creating element \"%s\"", GST_OBJECT_NAME (factory));
if (factory->type == 0)
goto no_type;
- /* create an instance of the element, cast so we don't assert on NULL */
- element = GST_ELEMENT_CAST (g_object_new (factory->type, NULL));
+ /* create an instance of the element, cast so we don't assert on NULL
+ * also set name as early as we can
+ */
+ if (name)
+ element =
+ GST_ELEMENT_CAST (g_object_new (factory->type, "name", name, NULL));
+ else
+ element = GST_ELEMENT_CAST (g_object_newv (factory->type, 0, NULL));
if (G_UNLIKELY (element == NULL))
goto no_element;
* an element at the same moment
*/
oclass = GST_ELEMENT_GET_CLASS (element);
- if (!g_atomic_pointer_compare_and_exchange (
- (gpointer) & oclass->elementfactory, NULL, factory))
+ if (!g_atomic_pointer_compare_and_exchange (&oclass->elementfactory, NULL,
+ factory))
gst_object_unref (factory);
+ else
+ /* This ref will never be dropped as the class is never destroyed */
+ GST_OBJECT_FLAG_SET (factory, GST_OBJECT_FLAG_MAY_BE_LEAKED);
- if (name)
- gst_object_set_name (GST_OBJECT_CAST (element), name);
-
- GST_DEBUG ("created element \"%s\"", GST_PLUGIN_FEATURE_NAME (factory));
+ GST_DEBUG ("created element \"%s\"", GST_OBJECT_NAME (factory));
return element;
/**
* gst_element_factory_make:
* @factoryname: a named factory to instantiate
- * @name: name of new element
+ * @name: (allow-none): name of new element, or %NULL to automatically create
+ * a unique 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,
+ * 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.
*
- * Returns: new #GstElement or NULL if unable to create element
+ * Returns: (transfer floating) (nullable): new #GstElement or %NULL
+ * if unable to create element
*/
GstElement *
gst_element_factory_make (const gchar * factoryname, const gchar * name)
GstElement *element;
g_return_val_if_fail (factoryname != NULL, NULL);
+ g_return_val_if_fail (gst_is_initialized (), NULL);
GST_LOG ("gstelementfactory: make \"%s\" \"%s\"",
factoryname, GST_STR_NULL (name));
goto create_failed;
gst_object_unref (factory);
+
return element;
/* ERRORS */
}
/**
- * gst_element_factory_get_longname:
+ * gst_element_factory_get_metadata:
* @factory: a #GstElementFactory
+ * @key: a key
*
- * Gets the longname for this factory
+ * Get the metadata on @factory with @key.
*
- * Returns: the longname
+ * Returns: (nullable): the metadata with @key on @factory or %NULL
+ * when there was no metadata with the given @key.
*/
-G_CONST_RETURN gchar *
-gst_element_factory_get_longname (GstElementFactory * factory)
+const gchar *
+gst_element_factory_get_metadata (GstElementFactory * factory,
+ const gchar * key)
{
- g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
-
- return factory->details.longname;
+ return gst_structure_get_string ((GstStructure *) factory->metadata, key);
}
/**
- * gst_element_factory_get_klass:
+ * gst_element_factory_get_metadata_keys:
* @factory: a #GstElementFactory
*
- * Gets the class for this factory.
+ * Get the available keys for the metadata on @factory.
*
- * Returns: the class
+ * Returns: (transfer full) (element-type utf8) (array zero-terminated=1) (nullable):
+ * a %NULL-terminated array of key strings, or %NULL when there is no
+ * metadata. Free with g_strfreev() when no longer needed.
*/
-G_CONST_RETURN gchar *
-gst_element_factory_get_klass (GstElementFactory * factory)
+gchar **
+gst_element_factory_get_metadata_keys (GstElementFactory * factory)
{
- g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
+ GstStructure *metadata;
+ gchar **arr;
+ gint i, num;
- return factory->details.klass;
-}
-
-/**
- * gst_element_factory_get_description:
- * @factory: a #GstElementFactory
- *
- * Gets the description for this factory.
- *
- * Returns: the description
- */
-G_CONST_RETURN gchar *
-gst_element_factory_get_description (GstElementFactory * factory)
-{
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
- return factory->details.description;
-}
+ metadata = (GstStructure *) factory->metadata;
+ if (metadata == NULL)
+ return NULL;
-/**
- * gst_element_factory_get_author:
- * @factory: a #GstElementFactory
- *
- * Gets the author for this factory.
- *
- * Returns: the author
- */
-G_CONST_RETURN gchar *
-gst_element_factory_get_author (GstElementFactory * factory)
-{
- g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
+ num = gst_structure_n_fields (metadata);
+ if (num == 0)
+ return NULL;
- return factory->details.author;
+ arr = g_new (gchar *, num + 1);
+ for (i = 0; i < num; ++i) {
+ arr[i] = g_strdup (gst_structure_nth_field_name (metadata, i));
+ }
+ arr[i] = NULL;
+ return arr;
}
/**
g_return_if_fail (interfacename[0] != '\0'); /* no empty string */
elementfactory->interfaces =
- g_list_prepend (elementfactory->interfaces, g_strdup (interfacename));
+ g_list_prepend (elementfactory->interfaces,
+ (gpointer) g_intern_string (interfacename));
}
/**
*
* Gets the #GList of #GstStaticPadTemplate for this factory.
*
- * Returns: the padtemplates
+ * Returns: (transfer none) (element-type Gst.StaticPadTemplate): the
+ * static pad templates
*/
-G_CONST_RETURN GList *
+const GList *
gst_element_factory_get_static_pad_templates (GstElementFactory * factory)
{
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
*
* Returns: type of URIs this element supports
*/
-gint
+GstURIType
gst_element_factory_get_uri_type (GstElementFactory * factory)
{
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), GST_URI_UNKNOWN);
* gst_element_factory_get_uri_protocols:
* @factory: a #GstElementFactory
*
- * Gets a NULL-terminated array of protocols this element supports or NULL if
+ * 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.
*
- * Returns: the supported protocols or NULL
+ * Returns: (transfer none) (array zero-terminated=1): the supported protocols
+ * or %NULL
*/
-gchar **
+const gchar *const *
gst_element_factory_get_uri_protocols (GstElementFactory * factory)
{
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
- return factory->uri_protocols;
+ return (const gchar * const *) factory->uri_protocols;
}
/**
*
* Check if @factory implements the interface with name @interfacename.
*
- * Returns: #TRUE when @factory implement the interface.
- *
- * Since: 0.10.14
+ * Returns: %TRUE when @factory implement the interface.
*/
gboolean
gst_element_factory_has_interface (GstElementFactory * factory,
}
return FALSE;
}
+
+
+typedef struct
+{
+ GstElementFactoryListType type;
+ GstRank minrank;
+} FilterData;
+
+
+/**
+ * gst_element_factory_list_is_type:
+ * @factory: a #GstElementFactory
+ * @type: a #GstElementFactoryListType
+ *
+ * Check if @factory is of the given types.
+ *
+ * Returns: %TRUE if @factory is of @type.
+ */
+gboolean
+gst_element_factory_list_is_type (GstElementFactory * factory,
+ GstElementFactoryListType type)
+{
+ gboolean res = FALSE;
+ const gchar *klass;
+
+ klass =
+ gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
+
+ if (klass == NULL) {
+ GST_ERROR_OBJECT (factory, "element factory is missing klass identifiers");
+ return res;
+ }
+
+ /* Filter by element type first, as soon as it matches
+ * one type, we skip all other tests */
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SINK))
+ res = (strstr (klass, "Sink") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SRC))
+ res = (strstr (klass, "Source") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECODER))
+ res = (strstr (klass, "Decoder") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCODER))
+ res = (strstr (klass, "Encoder") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_MUXER))
+ res = (strstr (klass, "Muxer") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEMUXER))
+ res = (strstr (klass, "Demux") != NULL);
+
+ /* FIXME : We're actually parsing two Classes here... */
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PARSER))
+ res = ((strstr (klass, "Parser") != NULL)
+ && (strstr (klass, "Codec") != NULL));
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER))
+ res = (strstr (klass, "Depayloader") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PAYLOADER))
+ res = (strstr (klass, "Payloader") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_FORMATTER))
+ res = (strstr (klass, "Formatter") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECRYPTOR))
+ res = (strstr (klass, "Decryptor") != NULL);
+
+ if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCRYPTOR))
+ res = (strstr (klass, "Encryptor") != NULL);
+
+ /* Filter by media type now, we only test if it
+ * matched any of the types above or only checking the media
+ * type was requested. */
+ if ((res || !(type & (GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS - 1)))
+ && (type & (GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO |
+ GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO |
+ GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE |
+ GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE |
+ GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA)))
+ res = ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
+ && (strstr (klass, "Audio") != NULL))
+ || ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO)
+ && (strstr (klass, "Video") != NULL))
+ || ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
+ && (strstr (klass, "Image") != NULL)) ||
+ ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE)
+ && (strstr (klass, "Subtitle") != NULL)) ||
+ ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA)
+ && (strstr (klass, "Metadata") != NULL));
+
+ return res;
+}
+
+static gboolean
+element_filter (GstPluginFeature * feature, FilterData * data)
+{
+ gboolean res;
+
+ /* we only care about element factories */
+ if (G_UNLIKELY (!GST_IS_ELEMENT_FACTORY (feature)))
+ return FALSE;
+
+ res = (gst_plugin_feature_get_rank (feature) >= data->minrank) &&
+ gst_element_factory_list_is_type (GST_ELEMENT_FACTORY_CAST (feature),
+ data->type);
+
+ return res;
+}
+
+/**
+ * gst_element_factory_list_get_elements:
+ * @type: a #GstElementFactoryListType
+ * @minrank: Minimum rank
+ *
+ * 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.
+ *
+ * Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
+ * #GstElementFactory elements. Use gst_plugin_feature_list_free() after
+ * usage.
+ */
+GList *
+gst_element_factory_list_get_elements (GstElementFactoryListType type,
+ GstRank minrank)
+{
+ GList *result;
+ FilterData data;
+
+ /* prepare type */
+ data.type = type;
+ data.minrank = minrank;
+
+ /* get the feature list using the filter */
+ result = gst_registry_feature_filter (gst_registry_get (),
+ (GstPluginFeatureFilter) element_filter, FALSE, &data);
+
+ /* sort on rank and name */
+ result = g_list_sort (result, gst_plugin_feature_rank_compare_func);
+
+ return result;
+}
+
+/**
+ * gst_element_factory_list_filter:
+ * @list: (transfer none) (element-type Gst.ElementFactory): a #GList of
+ * #GstElementFactory to filter
+ * @caps: a #GstCaps
+ * @direction: a #GstPadDirection to filter on
+ * @subsetonly: whether to filter on caps subsets or not.
+ *
+ * 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.
+ *
+ * Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
+ * #GstElementFactory elements that match the given requisites.
+ * Use #gst_plugin_feature_list_free after usage.
+ */
+GList *
+gst_element_factory_list_filter (GList * list,
+ const GstCaps * caps, GstPadDirection direction, gboolean subsetonly)
+{
+ GQueue results = G_QUEUE_INIT;
+
+ GST_DEBUG ("finding factories");
+
+ /* loop over all the factories */
+ for (; list; list = list->next) {
+ GstElementFactory *factory;
+ const GList *templates;
+ GList *walk;
+
+ factory = (GstElementFactory *) list->data;
+
+ GST_DEBUG ("Trying %s",
+ gst_plugin_feature_get_name ((GstPluginFeature *) factory));
+
+ /* get the templates from the element factory */
+ templates = gst_element_factory_get_static_pad_templates (factory);
+ for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
+ GstStaticPadTemplate *templ = walk->data;
+
+ /* we only care about the sink templates */
+ if (templ->direction == direction) {
+ GstCaps *tmpl_caps;
+
+ /* try to intersect the caps with the caps of the template */
+ tmpl_caps = gst_static_caps_get (&templ->static_caps);
+
+ /* FIXME, intersect is not the right method, we ideally want to check
+ * for a subset here */
+
+ /* check if the intersection is empty */
+ if ((subsetonly && gst_caps_is_subset (caps, tmpl_caps)) ||
+ (!subsetonly && gst_caps_can_intersect (caps, tmpl_caps))) {
+ /* non empty intersection, we can use this element */
+ g_queue_push_tail (&results, gst_object_ref (factory));
+ gst_caps_unref (tmpl_caps);
+ break;
+ }
+ gst_caps_unref (tmpl_caps);
+ }
+ }
+ }
+ return results.head;
+}
projects / platform / upstream / gstreamer.git / blobdiff