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- Added function to apply a custom filter on plugin features

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Original commit message from CVS:
- Added function to apply a custom filter on plugin features
This commit is contained in:
Wim Taymans 2003-04-12 15:14:55 +00:00
parent 0c6387ce5f
commit bd3511da69
2 changed files with 75 additions and 13 deletions
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73
gst/gstregistrypool.c
View file

@ -146,6 +146,15 @@ gst_registry_pool_plugin_list (void)
return g_list_concat (_gst_registry_pool_plugins, result);
}
GstFeatureFilterResult
gst_registry_pool_feature_type_filter (GstPluginFeature *feature, GType type)
{
if (type == 0 || G_OBJECT_TYPE (feature) == type)
return GST_FEATURE_FILTER_OK;
return GST_FEATURE_FILTER_NOK;
}
/**
* gst_registry_pool_feature_list:
* @type: the type of the features to list.
@ -157,28 +166,66 @@ gst_registry_pool_plugin_list (void)
GList*
gst_registry_pool_feature_list (GType type)
{
GList *result = NULL;
GList *plugins = gst_registry_pool_plugin_list ();
return gst_registry_pool_feature_filter (
(GstPluginFeatureFilter) gst_registry_pool_feature_type_filter,
GINT_TO_POINTER (type));
}
while (plugins) {
/**
* gst_registry_pool_feature_filter:
* @filter: the filter to apply to the feature list
* @user_data: data passed to the filter function
*
* Apply the filter function to all features and return a list
* of those features that satisfy the filter.
*
* Returns: a GList of pluginfeatures, g_list_free after use.
*/
GList*
gst_registry_pool_feature_filter (GstPluginFeatureFilter filter, gpointer user_data)
{
GList *result = NULL;
GList *plugins, *orig;
gboolean done = FALSE;
orig = plugins = gst_registry_pool_plugin_list ();
while (plugins && !done) {
GstPlugin *plugin = GST_PLUGIN (plugins->data);
GList *features = plugin->features;
while (features) {
GstPluginFeature *feature = GST_PLUGIN_FEATURE (features->data);
if (type == 0 || G_OBJECT_TYPE (feature) == type) {
result = g_list_prepend (result, feature);
}
features = g_list_next (features);
}
plugins = g_list_next (plugins);
while (features && !done) {
GstPluginFeature *feature = GST_PLUGIN_FEATURE (features->data);
gboolean res = GST_FEATURE_FILTER_OK;
features = g_list_next (features);
if (filter)
res = filter (feature, user_data);
switch (res) {
case GST_FEATURE_FILTER_DONE:
done = TRUE;
/* fallthrough */
case GST_FEATURE_FILTER_OK:
result = g_list_prepend (result, feature);
break;
case GST_FEATURE_FILTER_NOK:
default:
break;
}
}
}
result = g_list_reverse (result);
g_list_free (orig);
return result;
}
/**
* gst_registry_pool_find_plugin:
* @name: the name of the plugin to find
@ -244,11 +291,11 @@ gst_registry_pool_find_feature (const gchar *name, GType type)
walk = _gst_registry_pool_plugins;
while (walk) {
GstPlugin *plugin = (GstPlugin *) (walk->data);
result = gst_plugin_find_feature (plugin, name, type);
if (result)
return result;
walk = g_list_next (walk);
}

15
gst/gstregistrypool.h
View file

@ -28,6 +28,17 @@
G_BEGIN_DECLS
typedef enum
{
GST_FEATURE_FILTER_OK, /* include feature in list */
GST_FEATURE_FILTER_NOK, /* does not include filter in list */
GST_FEATURE_FILTER_DONE, /* includes filter in list and stop processing */
} GstFeatureFilterResult;
typedef GstFeatureFilterResult (*GstPluginFeatureFilter) (GstPluginFeature *feature,
gpointer user_data);
/* the pool of registries */
GList* gst_registry_pool_list (void);
void gst_registry_pool_add (GstRegistry *registry, guint priority);
@ -39,6 +50,10 @@ void gst_registry_pool_load_all (void);
GList* gst_registry_pool_plugin_list (void);
GList* gst_registry_pool_feature_list (GType type);
GList* gst_registry_pool_feature_filter (GstPluginFeatureFilter filter, gpointer user_data);
GstFeatureFilterResult gst_registry_pool_feature_type_filter (GstPluginFeature *feature, GType type);
GstPlugin* gst_registry_pool_find_plugin (const gchar *name);
GstPluginFeature* gst_registry_pool_find_feature (const gchar *name, GType type);