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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstPluginfeature: GStreamer 1.0 Core Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer 1.0 Core Reference Manual">
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<link rel="up" href="libgstreamer.html" title="GStreamer Core Library">
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<link rel="prev" href="GstPlugin.html" title="GstPlugin">
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</head>
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Top |
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Description |
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Object Hierarchy
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GstPluginfeature
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GstPluginfeature — Base class for contents of a GstPlugin
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Functions
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gboolean
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(*GstPluginFeatureFilter) ()
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void
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gst_plugin_feature_set_rank ()
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#define
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gst_plugin_feature_set_name()
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guint
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gst_plugin_feature_get_rank ()
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#define
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gst_plugin_feature_get_name()
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GstPlugin *
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gst_plugin_feature_get_plugin ()
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const gchar *
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gst_plugin_feature_get_plugin_name ()
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GstPluginFeature *
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gst_plugin_feature_load ()
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GList *
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gst_plugin_feature_list_copy ()
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void
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gst_plugin_feature_list_free ()
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#define
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GST_PLUGIN_FEATURE_LIST_DEBUG()
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gboolean
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gst_plugin_feature_check_version ()
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gint
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gst_plugin_feature_rank_compare_func ()
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Types and Values
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GstPluginFeature
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enum
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GstRank
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Object Hierarchy
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GObject
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╰── GInitiallyUnowned
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╰── GstObject
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╰── GstPluginFeature
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├── GstElementFactory
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├── GstTracerFactory
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├── GstTypeFindFactory
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├── GstDeviceProviderFactory
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╰── GstDynamicTypeFactory
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Includes
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#include <gst/gst.h>
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Description
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This is a base class for anything that can be added to a GstPlugin.
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Functions
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GstPluginFeatureFilter ()
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gboolean
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(*GstPluginFeatureFilter) (GstPluginFeature *feature,
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gpointer user_data);
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A function that can be used with e.g. gst_registry_feature_filter()
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to get a list of pluginfeature that match certain criteria.
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Parameters
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feature
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the pluginfeature to check
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user_data
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the user_data that has been passed on e.g.
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gst_registry_feature_filter()
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Returns
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TRUE for a positive match, FALSE otherwise
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gst_plugin_feature_set_rank ()
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void
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gst_plugin_feature_set_rank (GstPluginFeature *feature,
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guint rank);
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Specifies a rank for a plugin feature, so that autoplugging uses
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the most appropriate feature.
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Parameters
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feature
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feature to rank
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rank
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rank value - higher number means more priority rank
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gst_plugin_feature_set_name()
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#define gst_plugin_feature_set_name(feature,name) gst_object_set_name(GST_OBJECT_CAST(feature),name)
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Sets the name of the plugin feature, getting rid of the old name if there was one.
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Parameters
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feature
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a GstPluginFeature to set the name of.
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name
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the new name
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gst_plugin_feature_get_rank ()
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guint
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gst_plugin_feature_get_rank (GstPluginFeature *feature);
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Gets the rank of a plugin feature.
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Parameters
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feature
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a feature
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Returns
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The rank of the feature
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gst_plugin_feature_get_name()
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#define gst_plugin_feature_get_name(feature) GST_OBJECT_NAME(feature)
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Returns the name of feature
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For a nameless plugin feature, this returns NULL.
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Parameters
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feature
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a GstPluginFeature to get the name of feature
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Returns
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the name of feature
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. MT safe.
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[transfer none][nullable]
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gst_plugin_feature_get_plugin ()
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GstPlugin *
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gst_plugin_feature_get_plugin (GstPluginFeature *feature);
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Get the plugin that provides this feature.
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Parameters
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feature
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a feature
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Returns
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the plugin that provides this
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feature, or NULL. Unref with gst_object_unref() when no
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longer needed.
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[transfer full][nullable]
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gst_plugin_feature_get_plugin_name ()
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const gchar *
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gst_plugin_feature_get_plugin_name (GstPluginFeature *feature);
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Get the name of the plugin that provides this feature.
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Parameters
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feature
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a feature
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Returns
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the name of the plugin that provides this
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feature, or NULL if the feature is not associated with a
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plugin.
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[nullable]
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Since: 1.2
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gst_plugin_feature_load ()
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GstPluginFeature *
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gst_plugin_feature_load (GstPluginFeature *feature);
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Loads the plugin containing feature
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if it's not already loaded. feature
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is
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unaffected; use the return value instead.
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Normally this function is used like this:
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1
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2
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3
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4
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5
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6
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GstPluginFeature *loaded_feature;
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loaded_feature = gst_plugin_feature_load (feature);
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// presumably, we're no longer interested in the potentially-unloaded feature
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gst_object_unref (feature);
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feature = loaded_feature;
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Parameters
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feature
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the plugin feature to check.
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[transfer none]
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Returns
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a reference to the loaded
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feature, or NULL on error.
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[transfer full][nullable]
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gst_plugin_feature_list_copy ()
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GList *
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gst_plugin_feature_list_copy (GList *list);
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Copies the list of features. Caller should call gst_plugin_feature_list_free
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when done with the list.
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Parameters
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list
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list
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of GstPluginFeature.
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[transfer none][element-type Gst.PluginFeature]
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Returns
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a copy of list
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,
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with each feature's reference count incremented.
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[transfer full][element-type Gst.PluginFeature]
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gst_plugin_feature_list_free ()
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void
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gst_plugin_feature_list_free (GList *list);
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Unrefs each member of list
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, then frees the list.
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Parameters
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list
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list
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of GstPluginFeature.
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[transfer full][element-type Gst.PluginFeature]
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GST_PLUGIN_FEATURE_LIST_DEBUG()
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#define GST_PLUGIN_FEATURE_LIST_DEBUG(list) gst_plugin_feature_list_debug(list)
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Debug the plugin feature names in list
|
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.
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Parameters
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list
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a GList of
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plugin features.
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[transfer none][element-type Gst.PluginFeature]
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gst_plugin_feature_check_version ()
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gboolean
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|
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gst_plugin_feature_check_version (GstPluginFeature *feature,
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|
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guint min_major,
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guint min_minor,
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guint min_micro);
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Checks whether the given plugin feature is at least
|
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the required version
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Parameters
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feature
|
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a feature
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min_major
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minimum required major version
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min_minor
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minimum required minor version
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min_micro
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minimum required micro version
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Returns
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TRUE if the plugin feature has at least
|
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the required version, otherwise FALSE.
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gst_plugin_feature_rank_compare_func ()
|
|
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gint
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gst_plugin_feature_rank_compare_func (gconstpointer p1,
|
|
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gconstpointer p2);
|
|
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Compares the two given GstPluginFeature instances. This function can be
|
|
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used as a GCompareFunc when sorting by rank and then by name.
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|
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Parameters
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p1
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a GstPluginFeature
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p2
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a GstPluginFeature
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Returns
|
|
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negative value if the rank of p1 > the rank of p2 or the ranks are
|
|
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equal but the name of p1 comes before the name of p2; zero if the rank
|
|
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and names are equal; positive value if the rank of p1 < the rank of p2 or the
|
|
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ranks are equal but the name of p2 comes before the name of p1
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Types and Values
|
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GstPluginFeature
|
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typedef struct _GstPluginFeature GstPluginFeature;
|
|
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Opaque GstPluginFeature structure.
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enum GstRank
|
|
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963350 |
Element priority ranks. Defines the order in which the autoplugger (or
|
|
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similar rank-picking mechanisms, such as e.g. gst_element_make_from_uri())
|
|
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will choose this element over an alternative one with the same function.
|
|
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These constants serve as a rough guidance for defining the rank of a
|
|
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GstPluginFeature. Any value is valid, including values bigger than
|
|
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963350 |
GST_RANK_PRIMARY
|
|
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.
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Members
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GST_RANK_NONE
|
|
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|
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will be chosen last or not at all
|
|
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GST_RANK_MARGINAL
|
|
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unlikely to be chosen
|
|
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|
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GST_RANK_SECONDARY
|
|
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|
|
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likely to be chosen
|
|
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|
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GST_RANK_PRIMARY
|
|
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|
|
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will be chosen first
|
|
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|
|
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See Also
|
|
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963350 |
GstPlugin
|
|
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963350 |
|
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|
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Generated by GTK-Doc V1.27
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|
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</body>
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</html>
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