*
* 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:gstpluginfeature
+ * @title: GstPluginfeature
+ * @short_description: Base class for contents of a GstPlugin
+ * @see_also: #GstPlugin
+ *
+ * This is a base class for anything that can be added to a #GstPlugin.
*/
#include "gst_private.h"
#include "gstregistry.h"
#include "gstinfo.h"
+#include <stdio.h>
#include <string.h>
-static void gst_plugin_feature_class_init (GstPluginFeatureClass * klass);
-static void gst_plugin_feature_init (GstPluginFeature * feature);
+#define GST_CAT_DEFAULT GST_CAT_PLUGIN_LOADING
+
static void gst_plugin_feature_finalize (GObject * object);
/* static guint gst_plugin_feature_signals[LAST_SIGNAL] = { 0 }; */
G_DEFINE_ABSTRACT_TYPE (GstPluginFeature, gst_plugin_feature, GST_TYPE_OBJECT);
-GstObjectClass *parent_class = NULL;
static void
gst_plugin_feature_class_init (GstPluginFeatureClass * klass)
{
- parent_class = g_type_class_ref (GST_TYPE_OBJECT);
-
- G_OBJECT_CLASS (klass)->finalize =
- GST_DEBUG_FUNCPTR (gst_plugin_feature_finalize);
+ G_OBJECT_CLASS (klass)->finalize = gst_plugin_feature_finalize;
}
static void
gst_plugin_feature_init (GstPluginFeature * feature)
{
-
+ /* do nothing, needed because of G_DEFINE_TYPE */
}
static void
gst_plugin_feature_finalize (GObject * object)
{
- GstPluginFeature *feature = GST_PLUGIN_FEATURE (object);
+ GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (object);
- GST_DEBUG ("finalizing feature %p", feature);
- g_free (feature->name);
- g_free (feature->plugin_name);
+ GST_DEBUG ("finalizing feature %p: '%s'", feature, GST_OBJECT_NAME (feature));
- G_OBJECT_CLASS (parent_class)->finalize (object);
+ if (feature->plugin != NULL) {
+ g_object_remove_weak_pointer ((GObject *) feature->plugin,
+ (gpointer *) & feature->plugin);
+ }
+
+ G_OBJECT_CLASS (gst_plugin_feature_parent_class)->finalize (object);
}
/**
* gst_plugin_feature_load:
- * @feature: the plugin feature to check
+ * @feature: (transfer none): the plugin feature to check
+ *
+ * Loads the plugin containing @feature if it's not already loaded. @feature is
+ * unaffected; use the return value instead.
*
- * Check if the plugin containing the feature is loaded,
- * if not, the plugin will be loaded.
+ * Normally this function is used like this:
+ * |[<!-- language="C" -->
+ * GstPluginFeature *loaded_feature;
*
- * Returns: The new feature
+ * loaded_feature = gst_plugin_feature_load (feature);
+ * // presumably, we're no longer interested in the potentially-unloaded feature
+ * gst_object_unref (feature);
+ * feature = loaded_feature;
+ * ]|
+ *
+ * Returns: (transfer full) (nullable): a reference to the loaded
+ * feature, or %NULL on error
*/
GstPluginFeature *
gst_plugin_feature_load (GstPluginFeature * feature)
g_return_val_if_fail (feature != NULL, FALSE);
g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
+ GST_DEBUG ("loading plugin for feature %p; '%s'", feature,
+ GST_OBJECT_NAME (feature));
if (feature->loaded)
- return feature;
+ return gst_object_ref (feature);
+ GST_DEBUG ("loading plugin %s", feature->plugin_name);
plugin = gst_plugin_load_by_name (feature->plugin_name);
- if (!plugin) {
- g_critical ("Failed to load plugin containing feature '%s'.",
- GST_PLUGIN_FEATURE_NAME (feature));
- return NULL;
- }
+ if (!plugin)
+ goto load_failed;
+
+ GST_DEBUG ("loaded plugin %s", feature->plugin_name);
gst_object_unref (plugin);
- real_feature =
- gst_registry_lookup_feature (gst_registry_get_default (), feature->name);
+ real_feature = gst_registry_lookup_feature (gst_registry_get (),
+ GST_OBJECT_NAME (feature));
- if (real_feature == NULL) {
- g_critical
- ("Loaded plugin containing feature '%s', but feature disappeared.",
- feature->name);
- }
- gst_object_unref (feature);
+ if (real_feature == NULL)
+ goto disappeared;
+ else if (!real_feature->loaded)
+ goto not_found;
return real_feature;
-}
-gboolean
-gst_plugin_feature_type_name_filter (GstPluginFeature * feature,
- GstTypeNameData * data)
-{
- return ((data->type == 0 || data->type == G_OBJECT_TYPE (feature)) &&
- (data->name == NULL
- || !strcmp (data->name, GST_PLUGIN_FEATURE_NAME (feature))));
+ /* ERRORS */
+load_failed:
+ {
+ GST_WARNING ("Failed to load plugin containing feature '%s'.",
+ GST_OBJECT_NAME (feature));
+ return NULL;
+ }
+disappeared:
+ {
+ GST_INFO
+ ("Loaded plugin containing feature '%s', but feature disappeared.",
+ GST_OBJECT_NAME (feature));
+ return NULL;
+ }
+not_found:
+ {
+ GST_INFO ("Tried to load plugin containing feature '%s', but feature was "
+ "not found.", GST_OBJECT_NAME (real_feature));
+ return NULL;
+ }
}
/**
- * gst_plugin_feature_set_name:
- * @feature: a feature
- * @name: the name to set
+ * gst_plugin_feature_set_rank:
+ * @feature: feature to rank
+ * @rank: rank value - higher number means more priority rank
*
- * Sets the name of a plugin feature. The name uniquely identifies a feature
- * within all features of the same type. Renaming a plugin feature is not
- * allowed. A copy is made of the name so you should free the supplied @name
- * after calling this function.
+ * Specifies a rank for a plugin feature, so that autoplugging uses
+ * the most appropriate feature.
*/
void
-gst_plugin_feature_set_name (GstPluginFeature * feature, const gchar * name)
+gst_plugin_feature_set_rank (GstPluginFeature * feature, guint rank)
{
+ g_return_if_fail (feature != NULL);
g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
- g_return_if_fail (name != NULL);
- if (feature->name) {
- g_return_if_fail (strcmp (feature->name, name) == 0);
- } else {
- feature->name = g_strdup (name);
- }
- gst_object_set_name (GST_OBJECT (feature), feature->name);
+ feature->rank = rank;
}
/**
- * gst_plugin_feature_get_name:
+ * gst_plugin_feature_get_rank:
* @feature: a feature
*
- * Gets the name of a plugin feature.
+ * Gets the rank of a plugin feature.
*
- * Returns: the name
+ * Returns: The rank of the feature
*/
-G_CONST_RETURN gchar *
-gst_plugin_feature_get_name (GstPluginFeature * feature)
+guint
+gst_plugin_feature_get_rank (GstPluginFeature * feature)
{
- g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), NULL);
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), GST_RANK_NONE);
- return feature->name;
+ return feature->rank;
}
/**
- * gst_plugin_feature_set_rank:
- * @feature: feature to rank
- * @rank: rank value - higher number means more priority rank
+ * gst_plugin_feature_get_plugin:
+ * @feature: a feature
*
- * Specifies a rank for a plugin feature, so that autoplugging uses
- * the most appropriate feature.
+ * Get the plugin that provides this feature.
+ *
+ * Returns: (transfer full) (nullable): the plugin that provides this
+ * feature, or %NULL. Unref with gst_object_unref() when no
+ * longer needed.
*/
-void
-gst_plugin_feature_set_rank (GstPluginFeature * feature, guint rank)
+GstPlugin *
+gst_plugin_feature_get_plugin (GstPluginFeature * feature)
{
- g_return_if_fail (feature != NULL);
- g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), NULL);
- feature->rank = rank;
+ if (feature->plugin == NULL)
+ return NULL;
+
+ return (GstPlugin *) gst_object_ref (feature->plugin);
}
/**
- * gst_plugin_feature_get rank:
+ * gst_plugin_feature_get_plugin_name:
* @feature: a feature
*
- * Gets the rank of a plugin feature.
+ * Get the name of the plugin that provides this feature.
*
- * Returns: The rank of the feature
+ * Returns: (nullable): the name of the plugin that provides this
+ * feature, or %NULL if the feature is not associated with a
+ * plugin.
+ *
+ * Since: 1.2
*/
-guint
-gst_plugin_feature_get_rank (GstPluginFeature * feature)
+const gchar *
+gst_plugin_feature_get_plugin_name (GstPluginFeature * feature)
{
- g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), GST_RANK_NONE);
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), NULL);
- return feature->rank;
+ if (feature->plugin == NULL)
+ return NULL;
+
+ return gst_plugin_get_name (feature->plugin);
}
+/**
+ * gst_plugin_feature_list_free:
+ * @list: (transfer full) (element-type Gst.PluginFeature): list
+ * of #GstPluginFeature
+ *
+ * Unrefs each member of @list, then frees the list.
+ */
void
gst_plugin_feature_list_free (GList * list)
{
GList *g;
for (g = list; g; g = g->next) {
- GstPluginFeature *feature = GST_PLUGIN_FEATURE (g->data);
+ GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (g->data);
gst_object_unref (feature);
}
g_list_free (list);
}
+
+/**
+ * gst_plugin_feature_list_copy:
+ * @list: (transfer none) (element-type Gst.PluginFeature): list
+ * of #GstPluginFeature
+ *
+ * Copies the list of features. Caller should call @gst_plugin_feature_list_free
+ * when done with the list.
+ *
+ * Returns: (transfer full) (element-type Gst.PluginFeature): a copy of @list,
+ * with each feature's reference count incremented.
+ */
+GList *
+gst_plugin_feature_list_copy (GList * list)
+{
+ GList *new_list = NULL;
+
+ if (G_LIKELY (list)) {
+ GList *last;
+
+ new_list = g_list_alloc ();
+ new_list->data = gst_object_ref (list->data);
+ new_list->prev = NULL;
+ last = new_list;
+ list = list->next;
+ while (list) {
+ last->next = g_list_alloc ();
+ last->next->prev = last;
+ last = last->next;
+ last->data = gst_object_ref (list->data);
+ list = list->next;
+ }
+ last->next = NULL;
+ }
+
+ return new_list;
+}
+
+/**
+ * gst_plugin_feature_list_debug:
+ * @list: (transfer none) (element-type Gst.PluginFeature): a #GList of
+ * plugin features
+ *
+ * Debug the plugin feature names in @list.
+ */
+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
+ * @min_major: minimum required major version
+ * @min_minor: minimum required minor version
+ * @min_micro: minimum required micro version
+ *
+ * Checks whether the given plugin feature is at least
+ * the required version
+ *
+ * Returns: %TRUE if the plugin feature has at least
+ * the required version, otherwise %FALSE.
+ */
+gboolean
+gst_plugin_feature_check_version (GstPluginFeature * feature,
+ guint min_major, guint min_minor, guint min_micro)
+{
+ GstRegistry *registry;
+ GstPlugin *plugin;
+ gboolean ret = FALSE;
+
+ g_return_val_if_fail (feature != NULL, FALSE);
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
+
+ GST_DEBUG ("Looking up plugin '%s' containing plugin feature '%s'",
+ feature->plugin_name, GST_OBJECT_NAME (feature));
+
+ registry = gst_registry_get ();
+ plugin = gst_registry_find_plugin (registry, feature->plugin_name);
+
+ if (plugin) {
+ const gchar *ver_str;
+ guint major, minor, micro, nano;
+ gint nscan;
+
+ ver_str = gst_plugin_get_version (plugin);
+ g_return_val_if_fail (ver_str != NULL, FALSE);
+
+ nscan = sscanf (ver_str, "%u.%u.%u.%u", &major, &minor, µ, &nano);
+ GST_DEBUG ("version string '%s' parsed to %d values", ver_str, nscan);
+
+ if (nscan >= 3) {
+ if (major > min_major)
+ ret = TRUE;
+ else if (major < min_major)
+ ret = FALSE;
+ else if (minor > min_minor)
+ ret = TRUE;
+ else if (minor < min_minor)
+ ret = FALSE;
+ else if (micro > min_micro)
+ ret = TRUE;
+ /* micro is 1 smaller but we have a nano version, this is the upcoming
+ * release of the requested version and we're ok then */
+ else if (nscan == 4 && nano > 0 && (micro + 1 == min_micro))
+ ret = TRUE;
+ else
+ ret = (micro == min_micro);
+
+ GST_DEBUG ("Checking whether %u.%u.%u >= %u.%u.%u? %s", major, minor,
+ micro, min_major, min_minor, min_micro, (ret) ? "yes" : "no");
+ } else {
+ GST_WARNING ("Could not parse version string '%s' of plugin '%s'",
+ ver_str, feature->plugin_name);
+ }
+
+ gst_object_unref (plugin);
+ } else {
+ GST_DEBUG ("Could not find plugin '%s'", feature->plugin_name);
+ }
+
+ 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 before the name of p1
+ */
+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 (GST_OBJECT_NAME (f1), GST_OBJECT_NAME (f2));
+
+ return diff;
+}
projects / platform / upstream / gstreamer.git / blobdiff