mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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GstElementFactory: Add listing features
https://bugzilla.gnome.org/show_bug.cgi?id=626181
This commit is contained in:
Edward Hervey
Edward Hervey
parent
503e1faaea
commit
17f9254264
5 changed files with 418 additions and 0 deletions
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@ -648,6 +648,32 @@ gst_element_factory_make
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gst_element_factory_can_sink_caps
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gst_element_factory_can_src_caps
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gst_element_factory_get_static_pad_templates
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GstElementFactoryListType
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GST_ELEMENT_FACTORY_TYPE_ANY
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GST_ELEMENT_FACTORY_TYPE_AUDIOVIDEO_SINKS
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GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER
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GST_ELEMENT_FACTORY_TYPE_DECODABLE
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GST_ELEMENT_FACTORY_TYPE_DECODER
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GST_ELEMENT_FACTORY_TYPE_DEMUXER
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GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER
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GST_ELEMENT_FACTORY_TYPE_ENCODER
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GST_ELEMENT_FACTORY_TYPE_FORMATTER
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GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS
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GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO
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GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE
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GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA
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GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE
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GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO
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GST_ELEMENT_FACTORY_TYPE_MEDIA_ANY
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GST_ELEMENT_FACTORY_TYPE_MUXER
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GST_ELEMENT_FACTORY_TYPE_PARSER
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GST_ELEMENT_FACTORY_TYPE_PAYLOADER
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GST_ELEMENT_FACTORY_TYPE_SINK
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GST_ELEMENT_FACTORY_TYPE_SRC
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GST_ELEMENT_FACTORY_TYPE_VIDEO_ENCODER
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gst_element_factory_list_filter
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gst_element_factory_list_get_elements
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gst_element_factory_list_is_type
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<SUBSECTION Standard>
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GstElementFactoryClass
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GST_ELEMENT_FACTORY
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@ -1814,7 +1840,9 @@ gst_plugin_feature_get_name
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gst_plugin_feature_load
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gst_plugin_feature_list_copy
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gst_plugin_feature_list_free
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gst_plugin_feature_list_debug
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gst_plugin_feature_check_version
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gst_plugin_feature_rank_compare_func
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<SUBSECTION Standard>
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GstPluginFeatureClass
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GST_PLUGIN_FEATURE
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@ -669,3 +669,199 @@ gst_element_factory_has_interface (GstElementFactory * factory,
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}
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return FALSE;
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}
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typedef struct
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{
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GstElementFactoryListType type;
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GstRank minrank;
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} FilterData;
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/**
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* gst_element_factory_list_is_type:
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* @factory: a #GstElementFactory
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* @type: a #GstElementFactoryListType
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*
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* Check if @factory if of the given types.
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*
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* Returns: %TRUE if @factory is of @type.
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*
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* Since: 0.10.31
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*/
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gboolean
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gst_element_factory_list_is_type (GstElementFactory * factory,
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GstElementFactoryListType type)
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{
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gboolean res = FALSE;
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const gchar *klass;
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klass = gst_element_factory_get_klass (factory);
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/* Filter by element type first, as soon as it matches
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* one type, we skip all other tests */
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SINK))
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res = (strstr (klass, "Sink") != NULL);
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SRC))
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res = (strstr (klass, "Source") != NULL);
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECODER))
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res = (strstr (klass, "Decoder") != NULL);
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCODER))
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res = (strstr (klass, "Encoder") != NULL);
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_MUXER))
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res = (strstr (klass, "Muxer") != NULL);
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEMUXER))
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res = (strstr (klass, "Demux") != NULL);
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/* FIXME : We're actually parsing two Classes here... */
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PARSER))
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res = ((strstr (klass, "Parser") != NULL)
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&& (strstr (klass, "Codec") != NULL));
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER))
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res = (strstr (klass, "Depayloader") != NULL);
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PAYLOADER))
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res = (strstr (klass, "Payloader") != NULL);
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if (!res && (type & GST_ELEMENT_FACTORY_TYPE_FORMATTER))
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res = (strstr (klass, "Formatter") != NULL);
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/* Filter by media type now, we only test if it
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* matched any of the types above. */
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if (res
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&& (type & (GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO |
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GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO |
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GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)))
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res = ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
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&& (strstr (klass, "Audio") != NULL))
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|| ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO)
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&& (strstr (klass, "Video") != NULL))
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|| ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
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&& (strstr (klass, "Image") != NULL));
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return res;
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}
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static gboolean
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element_filter (GstPluginFeature * feature, FilterData * data)
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{
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gboolean res;
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/* we only care about element factories */
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if (G_UNLIKELY (!GST_IS_ELEMENT_FACTORY (feature)))
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return FALSE;
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res = (gst_plugin_feature_get_rank (feature) >= data->minrank) &&
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gst_element_factory_list_is_type (GST_ELEMENT_FACTORY_CAST (feature),
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data->type);
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return res;
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}
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/**
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* gst_element_factory_list_get_elements:
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* @type: a #GstElementFactoryListType
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* @minrank: Minimum rank
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*
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* Get a list of factories that match the given @type. Only elements
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* with a rank greater or equal to @minrank will be returned.
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* The list of factories is returned by decreasing rank.
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*
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* Returns: a #GList of #GstElementFactory elements. Use
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* gst_plugin_feature_list_free() after usage.
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*
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* Since: 0.10.31
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*/
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GList *
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gst_element_factory_list_get_elements (GstElementFactoryListType type,
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GstRank minrank)
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{
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GList *result;
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FilterData data;
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/* prepare type */
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data.type = type;
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data.minrank = minrank;
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/* get the feature list using the filter */
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result = gst_default_registry_feature_filter ((GstPluginFeatureFilter)
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element_filter, FALSE, &data);
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/* sort on rank and name */
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result = g_list_sort (result, gst_plugin_feature_rank_compare_func);
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return result;
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}
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/**
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* gst_element_factory_list_filter:
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* @list: a #GList of #GstElementFactory to filter
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* @caps: a #GstCaps
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* @direction: a #GstPadDirection to filter on
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* @subsetonly: whether to filter on caps subsets or not.
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*
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* Filter out all the elementfactories in @list that can handle @caps in
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* the given direction.
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*
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* If @subsetonly is %TRUE, then only the elements whose pads templates
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* are a complete superset of @caps will be returned. Else any element
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* whose pad templates caps can intersect with @caps will be returned.
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*
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* Returns: a #GList of #GstElementFactory elements that match the
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* given requisits. Use #gst_plugin_feature_list_free after usage.
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*
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* Since: 0.10.31
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*/
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GList *
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gst_element_factory_list_filter (GList * list,
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const GstCaps * caps, GstPadDirection direction, gboolean subsetonly)
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{
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GList *result = NULL;
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GST_DEBUG ("finding factories");
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/* loop over all the factories */
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for (; list; list = list->next) {
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GstElementFactory *factory;
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const GList *templates;
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GList *walk;
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factory = (GstElementFactory *) list->data;
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GST_DEBUG ("Trying %s",
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gst_plugin_feature_get_name ((GstPluginFeature *) factory));
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/* get the templates from the element factory */
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templates = gst_element_factory_get_static_pad_templates (factory);
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for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
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GstStaticPadTemplate *templ = walk->data;
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/* we only care about the sink templates */
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if (templ->direction == direction) {
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GstCaps *tmpl_caps;
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/* try to intersect the caps with the caps of the template */
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tmpl_caps = gst_static_caps_get (&templ->static_caps);
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/* FIXME, intersect is not the right method, we ideally want to check
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* for a subset here */
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/* check if the intersection is empty */
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if ((subsetonly && gst_caps_is_subset (caps, tmpl_caps)) ||
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(!subsetonly && gst_caps_can_intersect (caps, tmpl_caps))) {
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/* non empty intersection, we can use this element */
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result = g_list_prepend (result, gst_object_ref (factory));
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break;
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}
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gst_caps_unref (tmpl_caps);
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}
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}
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}
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return g_list_reverse (result);
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}
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@ -165,8 +165,140 @@ void __gst_element_factory_add_interface (GstElementFacto
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gboolean gst_element_register (GstPlugin *plugin, const gchar *name,
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guint rank, GType type);
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/* Factory list functions */
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/**
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* GstFactoryListType:
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* @GST_ELEMENT_FACTORY_TYPE_DECODER: Decoder elements
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* @GST_ELEMENT_FACTORY_TYPE_ENCODER: Encoder elements
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* @GST_ELEMENT_FACTORY_TYPE_SINK: Sink elements
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* @GST_ELEMENT_FACTORY_TYPE_SRC: Source elements
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* @GST_ELEMENT_FACTORY_TYPE_MUXER: Muxer elements
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* @GST_ELEMENT_FACTORY_TYPE_DEMUXER: Demuxer elements
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* @GST_ELEMENT_FACTORY_TYPE_PARSER: Parser elements
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* @GST_ELEMENT_FACTORY_TYPE_PAYLOADER: Payloader elements
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* @GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER: Depayloader elements
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* @GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS: Private, do not use
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO: Elements handling video media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO: Elements handling audio media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE: Elements handling image media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE: Elements handling subtitle media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA: Elements handling metadata media types
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*
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* The type of #GstElementFactory to filter.
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*
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* All @GstFactoryListType up to @GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS are exclusive.
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*
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* If one or more of the MEDIA types are specified, then only elements
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* matching the specified media types will be selected.
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*
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* Since: 0.10.31
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*/
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typedef guint64 GstElementFactoryListType;
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#define GST_ELEMENT_FACTORY_TYPE_DECODER (G_GUINT64_CONSTANT (1) << 0)
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#define GST_ELEMENT_FACTORY_TYPE_ENCODER (G_GUINT64_CONSTANT (1) << 1)
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#define GST_ELEMENT_FACTORY_TYPE_SINK (G_GUINT64_CONSTANT (1) << 2)
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#define GST_ELEMENT_FACTORY_TYPE_SRC (G_GUINT64_CONSTANT (1) << 3)
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#define GST_ELEMENT_FACTORY_TYPE_MUXER (G_GUINT64_CONSTANT (1) << 4)
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#define GST_ELEMENT_FACTORY_TYPE_DEMUXER (G_GUINT64_CONSTANT (1) << 5)
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#define GST_ELEMENT_FACTORY_TYPE_PARSER (G_GUINT64_CONSTANT (1) << 6)
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#define GST_ELEMENT_FACTORY_TYPE_PAYLOADER (G_GUINT64_CONSTANT (1) << 7)
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#define GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER (G_GUINT64_CONSTANT (1) << 8)
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#define GST_ELEMENT_FACTORY_TYPE_FORMATTER (G_GUINT64_CONSTANT (1) << 9)
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#define GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS (G_GUINT64_CONSTANT (1) << 48)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO (G_GUINT64_CONSTANT (1) << 49)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO (G_GUINT64_CONSTANT (1) << 50)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE (G_GUINT64_CONSTANT (1) << 51)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE (G_GUINT64_CONSTANT (1) << 52)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA (G_GUINT64_CONSTANT (1) << 53)
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/**
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* GST_ELEMENT_FACTORY_TYPE_ANY:
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* Elements of any of the defined GST_ELEMENT_FACTORY_LIST types
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_ANY G_GUINT64_CONSTANT ((1 << 49) - 1)
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/**
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* GST_ELEMENT_FACTORY_TYPE_MEDIA_ANY:
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* Elements matching any of the defined GST_ELEMENT_FACTORY_TYPE_MEDIA types
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*
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* Note: Do not use this if you wish to not filter against any of the defined
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* media types. If you wish to do this, simply don't specify any
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* GST_ELEMENT_FACTORY_TYPE_MEDIA flag.
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_ANY (~G_GUINT64_CONSTANT (0) << 48)
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/**
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* GST_ELEMENT_FACTORY_TYPE_VIDEO_ENCODER:
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* All encoders handling video or image media types
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_VIDEO_ENCODER (GST_ELEMENT_FACTORY_TYPE_ENCODER | GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO | GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
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/**
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* GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER:
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* All encoders handling audio media types
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER (GST_ELEMENT_FACTORY_TYPE_ENCODER | GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
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/**
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* GST_ELEMENT_FACTORY_TYPE_AUDIOVIDEO_SINKS:
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*
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* All sinks handling audio, video or image media types
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*
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* Since: 0.10.31
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*/
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#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)
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/**
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* GST_ELEMENT_FACTORY_TYPE_DECODABLE:
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*
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* All elements used to 'decode' streams (decoders, demuxers, parsers, depayloaders)
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_DECODABLE \
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(GST_ELEMENT_FACTORY_TYPE_DECODER | GST_ELEMENT_FACTORY_TYPE_DEMUXER | GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER | GST_ELEMENT_FACTORY_TYPE_PARSER)
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/* Element klass defines */
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#define GST_ELEMENT_FACTORY_KLASS_DECODER "Decoder"
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#define GST_ELEMENT_FACTORY_KLASS_ENCODER "Encoder"
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#define GST_ELEMENT_FACTORY_KLASS_SINK "Sink"
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#define GST_ELEMENT_FACTORY_KLASS_SRC "Source"
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#define GST_ELEMENT_FACTORY_KLASS_MUXER "Muxer"
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#define GST_ELEMENT_FACTORY_KLASS_DEMUXER "Demuxer"
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#define GST_ELEMENT_FACTORY_KLASS_PARSER "Parser"
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#define GST_ELEMENT_FACTORY_KLASS_PAYLOADER "Payloader"
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#define GST_ELEMENT_FACTORY_KLASS_DEPAYLOADER "Depayloader"
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#define GST_ELEMENT_FACTORY_KLASS_FORMATTER "Formatter"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_VIDEO "Video"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_AUDIO "Audio"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_IMAGE "Image"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_SUBTITLE "Subtitle"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_METADATA "Metadata"
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gboolean gst_element_factory_list_is_type (GstElementFactory *factory,
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GstElementFactoryListType type);
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GList * gst_element_factory_list_get_elements (GstElementFactoryListType type,
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GstRank minrank);
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GList * gst_element_factory_list_filter (GList *list, const GstCaps *caps,
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GstPadDirection direction,
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gboolean subsetonly);
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G_END_DECLS
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#endif /* __GST_ELEMENT_FACTORY_H__ */
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@ -295,6 +295,26 @@ gst_plugin_feature_list_copy (GList * list)
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return new_list;
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}
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/**
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* gst_plugin_feature_list_debug:
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* @list: a #GList of plugin features
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*
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* Debug the plugin feature names in @list.
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*
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* Since: 0.10.31
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*/
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void
|
||||
gst_plugin_feature_list_debug (GList * list)
|
||||
{
|
||||
#ifndef GST_DISABLE_GST_DEBUG
|
||||
while (list) {
|
||||
GST_DEBUG ("%s",
|
||||
gst_plugin_feature_get_name ((GstPluginFeature *) list->data));
|
||||
list = list->next;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* gst_plugin_feature_check_version:
|
||||
* @feature: a feature
|
||||
|
|
@ -368,3 +388,36 @@ gst_plugin_feature_check_version (GstPluginFeature * feature,
|
|||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* gst_plugin_feature_rank_compare_func:
|
||||
* @p1: a #GstPluginFeature
|
||||
* @p2: a #GstPluginFeature
|
||||
*
|
||||
* Compares the two given #GstPluginFeature instances. This function can be
|
||||
* used as a #GCompareFunc when sorting by rank and then by name.
|
||||
*
|
||||
* Returns: negative value if the rank of p1 > the rank of p2 or the ranks are
|
||||
* equal but the name of p1 comes before the name of p2; zero if the rank
|
||||
* and names are equal; positive value if the rank of p1 < the rank of p2 or the
|
||||
* ranks are equal but the name of p2 comes after the name of p1
|
||||
*
|
||||
* Since: 0.10.31
|
||||
*/
|
||||
gint
|
||||
gst_plugin_feature_rank_compare_func (gconstpointer p1, gconstpointer p2)
|
||||
{
|
||||
GstPluginFeature *f1, *f2;
|
||||
gint diff;
|
||||
|
||||
f1 = (GstPluginFeature *) p1;
|
||||
f2 = (GstPluginFeature *) p2;
|
||||
|
||||
diff = f2->rank - f1->rank;
|
||||
if (diff != 0)
|
||||
return diff;
|
||||
|
||||
diff = strcmp (f2->name, f1->name);
|
||||
|
||||
return diff;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -138,11 +138,20 @@ G_CONST_RETURN gchar *gst_plugin_feature_get_name (GstPluginFeature *featu
|
|||
|
||||
void gst_plugin_feature_list_free (GList *list);
|
||||
GList *gst_plugin_feature_list_copy (GList *list);
|
||||
void gst_plugin_feature_list_debug (GList *list);
|
||||
|
||||
#ifndef GST_DISABLE_GST_DEBUG
|
||||
#define GST_PLUGIN_FEATURE_LIST_DEBUG(list) gst_plugin_feature_list_debug(list)
|
||||
#else
|
||||
#define GST_PLUGIN_FEATURE_LIST_DEBUG(list)
|
||||
#endif
|
||||
|
||||
gboolean gst_plugin_feature_check_version (GstPluginFeature *feature,
|
||||
guint min_major,
|
||||
guint min_minor,
|
||||
guint min_micro);
|
||||
gint gst_plugin_feature_rank_compare_func (gconstpointer p1,
|
||||
gconstpointer p2);
|
||||
|
||||
G_END_DECLS
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue