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gstplugin: Handle static plugins in gst_plugin_load_by_name()

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gst_plugin_load_by_name() assumed a plugin has a filename,
which isn't true for static plugins, leading to criticals.

If a plugin is already loaded, just return the loaded plugin,
which makes it work for static plugins as well as saving a
moment for already-loaded dynamic plugins.

Add locking in gst_plugin_is_loaded(), as a plugin may be
still being loaded in another thread.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3552>
This commit is contained in:
Jan Schmidt 2022-12-10 03:54:23 +11:00 committed by GStreamer Marge Bot
parent cbab7ffefb
commit 0791a73a04
1 changed files with 28 additions and 15 deletions
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25
subprojects/gstreamer/gst/gstplugin.c
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@ -1183,8 +1183,16 @@ gboolean
gst_plugin_is_loaded (GstPlugin * plugin)
{
g_return_val_if_fail (plugin != NULL, FALSE);
gboolean ret;
return (plugin->module != NULL || plugin->filename == NULL);
if (plugin->filename == NULL)
return TRUE; /* Static plugin */
g_mutex_lock (&gst_plugin_loading_mutex);
ret = (plugin->module != NULL);
g_mutex_unlock (&gst_plugin_loading_mutex);
return ret;
}
/**
@ -1406,7 +1414,16 @@ gst_plugin_load_by_name (const gchar * name)
GST_DEBUG ("looking up plugin %s in default registry", name);
plugin = gst_registry_find_plugin (gst_registry_get (), name);
if (plugin) {
if (plugin == NULL) {
GST_DEBUG ("Could not find plugin %s in registry", name);
return NULL;
}
if (gst_plugin_is_loaded (plugin)) {
GST_DEBUG ("plugin %s already loaded", name);
return plugin;
}
GST_DEBUG ("loading plugin %s from file %s", name, plugin->filename);
newplugin = gst_plugin_load_file (plugin->filename, &error);
gst_object_unref (plugin);
@ -1418,10 +1435,6 @@ gst_plugin_load_by_name (const gchar * name)
}
/* newplugin was reffed by load_file */
return newplugin;
}
GST_DEBUG ("Could not find plugin %s in registry", name);
return NULL;
}
/**