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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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72e0b732f6
Original commit message from CVS: * gst/gstplugin.c: * gst/gstregistry.c: GstRegistryPool doesn't exist; don't refer to it in docs. Don't refer to functions that don't exist in docs, it's unhelpful.
1034 lines
28 KiB
C
1034 lines
28 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstplugin.c: Plugin subsystem for loading elements, types, and libs
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstplugin
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* @short_description: Container for features loaded from a shared object module
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* @see_also: #GstPluginFeature, #GstElementFactory
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*
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* GStreamer is extensible, so #GstElement instances can be loaded at runtime.
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* A plugin system can provide one or more of the basic
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* <application>GStreamer</application> #GstPluginFeature subclasses.
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*
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* A plugin should export a symbol <symbol>gst_plugin_desc</symbol> that is a
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* struct of type #GstPluginDesc.
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* the plugin loader will check the version of the core library the plugin was
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* linked against and will create a new #GstPlugin. It will then call the
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* #GstPluginInitFunc function that was provided in the
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* <symbol>gst_plugin_desc</symbol>.
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*
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* Once you have a handle to a #GstPlugin (e.g. from the #GstRegistry), you
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* can add any object that subclasses #GstPluginFeature.
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*
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* Usually plugins are always automaticlly loaded so you don't need to call
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* gst_plugin_load() explicitly to bring it into memory. There are options to
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* statically link plugins to an app or even use GStreamer without a plugin
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* repository in which case gst_plugin_load() can be needed to bring the plugin
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* into memory.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib/gstdio.h>
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#include <sys/types.h>
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#ifdef HAVE_DIRENT_H
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#include <dirent.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <signal.h>
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#include <errno.h>
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#include "gst_private.h"
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#include "glib-compat-private.h"
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#include <gst/gst.h>
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#define GST_CAT_DEFAULT GST_CAT_PLUGIN_LOADING
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static guint _num_static_plugins; /* 0 */
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static GstPluginDesc *_static_plugins; /* NULL */
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static gboolean _gst_plugin_inited;
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/* static variables for segfault handling of plugin loading */
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static char *_gst_plugin_fault_handler_filename = NULL;
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#ifndef HAVE_WIN32
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static gboolean _gst_plugin_fault_handler_is_setup = FALSE;
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#endif
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/* list of valid licenses.
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* One of these must be specified or the plugin won't be loaded
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* Contact gstreamer-devel@lists.sourceforge.net if your license should be
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* added.
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*
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* GPL: http://www.gnu.org/copyleft/gpl.html
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* LGPL: http://www.gnu.org/copyleft/lesser.html
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* QPL: http://www.trolltech.com/licenses/qpl.html
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* MPL: http://www.opensource.org/licenses/mozilla1.1.php
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* MIT/X11: http://www.opensource.org/licenses/mit-license.php
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* 3-clause BSD: http://www.opensource.org/licenses/bsd-license.php
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*/
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static const gchar *valid_licenses[] = {
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"LGPL", /* GNU Lesser General Public License */
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"GPL", /* GNU General Public License */
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"QPL", /* Trolltech Qt Public License */
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"GPL/QPL", /* Combi-license of GPL + QPL */
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"MPL", /* MPL 1.1 license */
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"BSD", /* 3-clause BSD license */
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"MIT/X11", /* MIT/X11 license */
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"Proprietary", /* Proprietary license */
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GST_LICENSE_UNKNOWN, /* some other license */
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NULL
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};
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static GstPlugin *gst_plugin_register_func (GstPlugin * plugin,
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const GstPluginDesc * desc);
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static void gst_plugin_desc_copy (GstPluginDesc * dest,
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const GstPluginDesc * src);
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static void gst_plugin_desc_free (GstPluginDesc * desc);
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G_DEFINE_TYPE (GstPlugin, gst_plugin, GST_TYPE_OBJECT);
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static void
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gst_plugin_init (GstPlugin * plugin)
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{
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/* do nothing, needed because of G_DEFINE_TYPE */
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}
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static void
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gst_plugin_finalize (GObject * object)
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{
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GstPlugin *plugin = GST_PLUGIN_CAST (object);
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GstRegistry *registry = gst_registry_get_default ();
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GList *g;
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GST_DEBUG ("finalizing plugin %p", plugin);
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for (g = registry->plugins; g; g = g->next) {
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if (g->data == (gpointer) plugin) {
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g_warning ("removing plugin that is still in registry");
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}
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}
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g_free (plugin->filename);
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g_free (plugin->basename);
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gst_plugin_desc_free (&plugin->desc);
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G_OBJECT_CLASS (gst_plugin_parent_class)->finalize (object);
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}
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static void
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gst_plugin_class_init (GstPluginClass * klass)
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{
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G_OBJECT_CLASS (klass)->finalize = GST_DEBUG_FUNCPTR (gst_plugin_finalize);
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}
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GQuark
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gst_plugin_error_quark (void)
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{
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static GQuark quark = 0;
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if (!quark)
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quark = g_quark_from_static_string ("gst_plugin_error");
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return quark;
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}
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#ifndef GST_REMOVE_DEPRECATED
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/* this function can be called in the GCC constructor extension, before
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* the _gst_plugin_initialize() was called. In that case, we store the
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* plugin description in a list to initialize it when we open the main
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* module later on.
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* When the main module is known, we can register the plugin right away.
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*/
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void
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_gst_plugin_register_static (GstPluginDesc * desc)
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{
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g_return_if_fail (desc != NULL);
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if (!_gst_plugin_inited) {
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/* We can't use any GLib functions here, since g_thread_init hasn't been
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* called yet, and we can't call it here either, or programs that don't
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* guard their g_thread_init calls in main() will just abort */
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++_num_static_plugins;
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_static_plugins =
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realloc (_static_plugins, _num_static_plugins * sizeof (GstPluginDesc));
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/* assume strings in the GstPluginDesc are static const or live forever */
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_static_plugins[_num_static_plugins - 1] = *desc;
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} else {
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gst_plugin_register_static (desc->major_version, desc->minor_version,
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desc->name, desc->description, desc->plugin_init, desc->version,
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desc->license, desc->source, desc->package, desc->origin);
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}
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}
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#endif
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/**
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* gst_plugin_register_static:
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* @major_version: the major version number of the GStreamer core that the
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* plugin was compiled for, you can just use GST_VERSION_MAJOR here
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* @minor_version: the minor version number of the GStreamer core that the
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* plugin was compiled for, you can just use GST_VERSION_MINOR here
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* @name: a unique name of the plugin (ideally prefixed with an application- or
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* library-specific namespace prefix in order to avoid name conflicts in
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* case a similar plugin with the same name ever gets added to GStreamer)
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* @description: description of the plugin
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* @init_func: pointer to the init function of this plugin.
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* @version: version string of the plugin
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* @license: effective license of plugin. Must be one of the approved licenses
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* (see #GstPluginDesc above) or the plugin will not be registered.
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* @source: source module plugin belongs to
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* @package: shipped package plugin belongs to
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* @origin: URL to provider of plugin
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*
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* Registers a static plugin, ie. a plugin which is private to an application
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* or library and contained within the application or library (as opposed to
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* being shipped as a separate module file).
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*
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* You must make sure that GStreamer has been initialised (with gst_init() or
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* via gst_init_get_option_group()) before calling this function.
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*
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* Returns: TRUE if the plugin was registered correctly, otherwise FALSE.
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*
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* Since: 0.10.16
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*/
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gboolean
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gst_plugin_register_static (gint major_version, gint minor_version,
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const gchar * name, gchar * description, GstPluginInitFunc init_func,
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const gchar * version, const gchar * license, const gchar * source,
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const gchar * package, const gchar * origin)
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{
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GstPluginDesc desc = { major_version, minor_version, name, description,
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init_func, version, license, source, package, origin,
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};
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GstPlugin *plugin;
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gboolean res = FALSE;
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g_return_val_if_fail (name != NULL, FALSE);
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g_return_val_if_fail (description != NULL, FALSE);
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g_return_val_if_fail (init_func != NULL, FALSE);
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g_return_val_if_fail (version != NULL, FALSE);
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g_return_val_if_fail (license != NULL, FALSE);
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g_return_val_if_fail (source != NULL, FALSE);
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g_return_val_if_fail (package != NULL, FALSE);
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g_return_val_if_fail (origin != NULL, FALSE);
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/* make sure gst_init() has been called */
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g_return_val_if_fail (_gst_plugin_inited != FALSE, FALSE);
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GST_LOG ("attempting to load static plugin \"%s\" now...", name);
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plugin = g_object_new (GST_TYPE_PLUGIN, NULL);
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if (gst_plugin_register_func (plugin, &desc) != NULL) {
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GST_INFO ("registered static plugin \"%s\"", name);
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res = gst_default_registry_add_plugin (plugin);
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GST_INFO ("added static plugin \"%s\", result: %d", name, res);
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}
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return res;
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}
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void
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_gst_plugin_initialize (void)
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{
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guint i;
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_gst_plugin_inited = TRUE;
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/* now register all static plugins */
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GST_INFO ("registering %u static plugins", _num_static_plugins);
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for (i = 0; i < _num_static_plugins; ++i) {
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gst_plugin_register_static (_static_plugins[i].major_version,
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_static_plugins[i].minor_version, _static_plugins[i].name,
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_static_plugins[i].description, _static_plugins[i].plugin_init,
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_static_plugins[i].version, _static_plugins[i].license,
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_static_plugins[i].source, _static_plugins[i].package,
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_static_plugins[i].origin);
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}
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if (_static_plugins) {
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free (_static_plugins);
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_static_plugins = NULL;
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_num_static_plugins = 0;
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}
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}
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/* this function could be extended to check if the plugin license matches the
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* applications license (would require the app to register its license somehow).
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* We'll wait for someone who's interested in it to code it :)
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*/
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static gboolean
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gst_plugin_check_license (const gchar * license)
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{
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const gchar **check_license = valid_licenses;
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g_assert (check_license);
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while (*check_license) {
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if (strcmp (license, *check_license) == 0)
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return TRUE;
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check_license++;
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}
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return FALSE;
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}
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static gboolean
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gst_plugin_check_version (gint major, gint minor)
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{
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/* return NULL if the major and minor version numbers are not compatible */
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/* with ours. */
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if (major != GST_VERSION_MAJOR || minor != GST_VERSION_MINOR)
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return FALSE;
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return TRUE;
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}
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static GstPlugin *
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gst_plugin_register_func (GstPlugin * plugin, const GstPluginDesc * desc)
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{
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if (!gst_plugin_check_version (desc->major_version, desc->minor_version)) {
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if (GST_CAT_DEFAULT)
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GST_WARNING ("plugin \"%s\" has incompatible version, not loading",
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plugin->filename);
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return NULL;
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}
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if (!desc->license || !desc->description || !desc->source ||
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!desc->package || !desc->origin) {
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if (GST_CAT_DEFAULT)
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GST_WARNING ("plugin \"%s\" has incorrect GstPluginDesc, not loading",
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plugin->filename);
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return NULL;
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}
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if (!gst_plugin_check_license (desc->license)) {
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if (GST_CAT_DEFAULT)
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GST_WARNING ("plugin \"%s\" has invalid license \"%s\", not loading",
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plugin->filename, desc->license);
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return NULL;
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}
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if (GST_CAT_DEFAULT)
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GST_LOG ("plugin \"%s\" looks good", GST_STR_NULL (plugin->filename));
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gst_plugin_desc_copy (&plugin->desc, desc);
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if (!((desc->plugin_init) (plugin))) {
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if (GST_CAT_DEFAULT)
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GST_WARNING ("plugin \"%s\" failed to initialise", plugin->filename);
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plugin->module = NULL;
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return NULL;
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}
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if (GST_CAT_DEFAULT)
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GST_LOG ("plugin \"%s\" initialised", GST_STR_NULL (plugin->filename));
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return plugin;
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}
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#ifdef HAVE_SIGACTION
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static struct sigaction oldaction;
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/*
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* _gst_plugin_fault_handler_restore:
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* segfault handler restorer
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*/
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static void
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_gst_plugin_fault_handler_restore (void)
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{
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if (!_gst_plugin_fault_handler_is_setup)
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return;
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_gst_plugin_fault_handler_is_setup = FALSE;
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sigaction (SIGSEGV, &oldaction, NULL);
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}
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/*
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* _gst_plugin_fault_handler_sighandler:
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* segfault handler implementation
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*/
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static void
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_gst_plugin_fault_handler_sighandler (int signum)
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{
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/* We need to restore the fault handler or we'll keep getting it */
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_gst_plugin_fault_handler_restore ();
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switch (signum) {
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case SIGSEGV:
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g_print ("\nERROR: ");
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g_print ("Caught a segmentation fault while loading plugin file:\n");
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g_print ("%s\n\n", _gst_plugin_fault_handler_filename);
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g_print ("Please either:\n");
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g_print ("- remove it and restart.\n");
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g_print ("- run with --gst-disable-segtrap and debug.\n");
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exit (-1);
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break;
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default:
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g_print ("Caught unhandled signal on plugin loading\n");
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break;
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}
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}
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/*
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* _gst_plugin_fault_handler_setup:
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* sets up the segfault handler
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*/
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static void
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_gst_plugin_fault_handler_setup (void)
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{
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struct sigaction action;
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/* if asked to leave segfaults alone, just return */
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if (!gst_segtrap_is_enabled ())
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return;
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if (_gst_plugin_fault_handler_is_setup)
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return;
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_gst_plugin_fault_handler_is_setup = TRUE;
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memset (&action, 0, sizeof (action));
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action.sa_handler = _gst_plugin_fault_handler_sighandler;
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sigaction (SIGSEGV, &action, &oldaction);
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}
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#else
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static void
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_gst_plugin_fault_handler_restore (void)
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{
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}
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static void
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_gst_plugin_fault_handler_setup (void)
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{
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}
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#endif
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static void _gst_plugin_fault_handler_setup ();
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static GStaticMutex gst_plugin_loading_mutex = G_STATIC_MUTEX_INIT;
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#define CHECK_PLUGIN_DESC_FIELD(desc,field,fn) \
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if (G_UNLIKELY ((desc)->field == NULL)) { \
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GST_ERROR ("GstPluginDesc for '%s' has no %s", fn, G_STRINGIFY (field)); \
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}
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/**
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* gst_plugin_load_file:
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* @filename: the plugin filename to load
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* @error: pointer to a NULL-valued GError
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*
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* Loads the given plugin and refs it. Caller needs to unref after use.
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*
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* Returns: a reference to the existing loaded GstPlugin, a reference to the
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* newly-loaded GstPlugin, or NULL if an error occurred.
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*/
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GstPlugin *
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gst_plugin_load_file (const gchar * filename, GError ** error)
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{
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GstPlugin *plugin;
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GModule *module;
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gboolean ret;
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gpointer ptr;
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struct stat file_status;
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GstRegistry *registry;
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g_return_val_if_fail (filename != NULL, NULL);
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registry = gst_registry_get_default ();
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g_static_mutex_lock (&gst_plugin_loading_mutex);
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plugin = gst_registry_lookup (registry, filename);
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if (plugin) {
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if (plugin->module) {
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g_static_mutex_unlock (&gst_plugin_loading_mutex);
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return plugin;
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} else {
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gst_object_unref (plugin);
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plugin = NULL;
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}
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}
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GST_CAT_DEBUG (GST_CAT_PLUGIN_LOADING, "attempt to load plugin \"%s\"",
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filename);
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if (g_module_supported () == FALSE) {
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GST_CAT_DEBUG (GST_CAT_PLUGIN_LOADING, "module loading not supported");
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g_set_error (error,
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GST_PLUGIN_ERROR,
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GST_PLUGIN_ERROR_MODULE, "Dynamic loading not supported");
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goto return_error;
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}
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if (g_stat (filename, &file_status)) {
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GST_CAT_DEBUG (GST_CAT_PLUGIN_LOADING, "problem accessing file");
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g_set_error (error,
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GST_PLUGIN_ERROR,
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GST_PLUGIN_ERROR_MODULE, "Problem accessing file %s: %s", filename,
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g_strerror (errno));
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goto return_error;
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}
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|
module = g_module_open (filename, G_MODULE_BIND_LOCAL);
|
|
if (module == NULL) {
|
|
GST_CAT_WARNING (GST_CAT_PLUGIN_LOADING, "module_open failed: %s",
|
|
g_module_error ());
|
|
g_set_error (error,
|
|
GST_PLUGIN_ERROR, GST_PLUGIN_ERROR_MODULE, "Opening module failed: %s",
|
|
g_module_error ());
|
|
/* If we failed to open the shared object, then it's probably because a
|
|
* plugin is linked against the wrong libraries. Print out an easy-to-see
|
|
* message in this case. */
|
|
g_warning ("Failed to load plugin '%s': %s", filename, g_module_error ());
|
|
goto return_error;
|
|
}
|
|
|
|
plugin = g_object_new (GST_TYPE_PLUGIN, NULL);
|
|
|
|
plugin->module = module;
|
|
plugin->filename = g_strdup (filename);
|
|
plugin->basename = g_path_get_basename (filename);
|
|
plugin->file_mtime = file_status.st_mtime;
|
|
plugin->file_size = file_status.st_size;
|
|
|
|
ret = g_module_symbol (module, "gst_plugin_desc", &ptr);
|
|
if (!ret) {
|
|
GST_DEBUG ("Could not find plugin entry point in \"%s\"", filename);
|
|
g_set_error (error,
|
|
GST_PLUGIN_ERROR,
|
|
GST_PLUGIN_ERROR_MODULE,
|
|
"File \"%s\" is not a GStreamer plugin", filename);
|
|
g_module_close (module);
|
|
goto return_error;
|
|
}
|
|
plugin->orig_desc = (GstPluginDesc *) ptr;
|
|
|
|
/* check plugin description: complain about bad values but accept them, to
|
|
* maintain backwards compatibility (FIXME: 0.11) */
|
|
CHECK_PLUGIN_DESC_FIELD (plugin->orig_desc, name, filename);
|
|
CHECK_PLUGIN_DESC_FIELD (plugin->orig_desc, description, filename);
|
|
CHECK_PLUGIN_DESC_FIELD (plugin->orig_desc, version, filename);
|
|
CHECK_PLUGIN_DESC_FIELD (plugin->orig_desc, license, filename);
|
|
CHECK_PLUGIN_DESC_FIELD (plugin->orig_desc, source, filename);
|
|
CHECK_PLUGIN_DESC_FIELD (plugin->orig_desc, package, filename);
|
|
CHECK_PLUGIN_DESC_FIELD (plugin->orig_desc, origin, filename);
|
|
|
|
GST_LOG ("Plugin %p for file \"%s\" prepared, calling entry function...",
|
|
plugin, filename);
|
|
|
|
/* this is where we load the actual .so, so let's trap SIGSEGV */
|
|
_gst_plugin_fault_handler_setup ();
|
|
_gst_plugin_fault_handler_filename = plugin->filename;
|
|
|
|
GST_LOG ("Plugin %p for file \"%s\" prepared, registering...",
|
|
plugin, filename);
|
|
|
|
if (!gst_plugin_register_func (plugin, plugin->orig_desc)) {
|
|
/* remove signal handler */
|
|
_gst_plugin_fault_handler_restore ();
|
|
GST_DEBUG ("gst_plugin_register_func failed for plugin \"%s\"", filename);
|
|
/* plugin == NULL */
|
|
g_set_error (error,
|
|
GST_PLUGIN_ERROR,
|
|
GST_PLUGIN_ERROR_MODULE,
|
|
"File \"%s\" appears to be a GStreamer plugin, but it failed to initialize",
|
|
filename);
|
|
g_module_close (module);
|
|
goto return_error;
|
|
}
|
|
|
|
/* remove signal handler */
|
|
_gst_plugin_fault_handler_restore ();
|
|
_gst_plugin_fault_handler_filename = NULL;
|
|
GST_INFO ("plugin \"%s\" loaded", plugin->filename);
|
|
|
|
gst_object_ref (plugin);
|
|
gst_default_registry_add_plugin (plugin);
|
|
|
|
g_static_mutex_unlock (&gst_plugin_loading_mutex);
|
|
return plugin;
|
|
|
|
return_error:
|
|
{
|
|
if (plugin)
|
|
gst_object_unref (plugin);
|
|
g_static_mutex_unlock (&gst_plugin_loading_mutex);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_plugin_desc_copy (GstPluginDesc * dest, const GstPluginDesc * src)
|
|
{
|
|
dest->major_version = src->major_version;
|
|
dest->minor_version = src->minor_version;
|
|
dest->name = g_intern_string (src->name);
|
|
/* maybe intern the description too, just for convenience? */
|
|
dest->description = g_strdup (src->description);
|
|
dest->plugin_init = src->plugin_init;
|
|
dest->version = g_intern_string (src->version);
|
|
dest->license = g_intern_string (src->license);
|
|
dest->source = g_intern_string (src->source);
|
|
dest->package = g_intern_string (src->package);
|
|
dest->origin = g_intern_string (src->origin);
|
|
}
|
|
|
|
/* unused */
|
|
static void
|
|
gst_plugin_desc_free (GstPluginDesc * desc)
|
|
{
|
|
g_free (desc->description);
|
|
memset (desc, 0, sizeof (GstPluginDesc));
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_name:
|
|
* @plugin: plugin to get the name of
|
|
*
|
|
* Get the short name of the plugin
|
|
*
|
|
* Returns: the name of the plugin
|
|
*/
|
|
const gchar *
|
|
gst_plugin_get_name (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->desc.name;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_description:
|
|
* @plugin: plugin to get long name of
|
|
*
|
|
* Get the long descriptive name of the plugin
|
|
*
|
|
* Returns: the long name of the plugin
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_plugin_get_description (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->desc.description;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_filename:
|
|
* @plugin: plugin to get the filename of
|
|
*
|
|
* get the filename of the plugin
|
|
*
|
|
* Returns: the filename of the plugin
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_plugin_get_filename (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->filename;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_version:
|
|
* @plugin: plugin to get the version of
|
|
*
|
|
* get the version of the plugin
|
|
*
|
|
* Returns: the version of the plugin
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_plugin_get_version (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->desc.version;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_license:
|
|
* @plugin: plugin to get the license of
|
|
*
|
|
* get the license of the plugin
|
|
*
|
|
* Returns: the license of the plugin
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_plugin_get_license (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->desc.license;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_source:
|
|
* @plugin: plugin to get the source of
|
|
*
|
|
* get the source module the plugin belongs to.
|
|
*
|
|
* Returns: the source of the plugin
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_plugin_get_source (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->desc.source;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_package:
|
|
* @plugin: plugin to get the package of
|
|
*
|
|
* get the package the plugin belongs to.
|
|
*
|
|
* Returns: the package of the plugin
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_plugin_get_package (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->desc.package;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_origin:
|
|
* @plugin: plugin to get the origin of
|
|
*
|
|
* get the URL where the plugin comes from
|
|
*
|
|
* Returns: the origin of the plugin
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_plugin_get_origin (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->desc.origin;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_get_module:
|
|
* @plugin: plugin to query
|
|
*
|
|
* Gets the #GModule of the plugin. If the plugin isn't loaded yet, NULL is
|
|
* returned.
|
|
*
|
|
* Returns: module belonging to the plugin or NULL if the plugin isn't
|
|
* loaded yet.
|
|
*/
|
|
GModule *
|
|
gst_plugin_get_module (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, NULL);
|
|
|
|
return plugin->module;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_is_loaded:
|
|
* @plugin: plugin to query
|
|
*
|
|
* queries if the plugin is loaded into memory
|
|
*
|
|
* Returns: TRUE is loaded, FALSE otherwise
|
|
*/
|
|
gboolean
|
|
gst_plugin_is_loaded (GstPlugin * plugin)
|
|
{
|
|
g_return_val_if_fail (plugin != NULL, FALSE);
|
|
|
|
return (plugin->module != NULL || plugin->filename == NULL);
|
|
}
|
|
|
|
#if 0
|
|
/**
|
|
* gst_plugin_feature_list:
|
|
* @plugin: plugin to query
|
|
* @filter: the filter to use
|
|
* @first: only return first match
|
|
* @user_data: user data passed to the filter function
|
|
*
|
|
* Runs a filter against all plugin features and returns a GList with
|
|
* the results. If the first flag is set, only the first match is
|
|
* returned (as a list with a single object).
|
|
*
|
|
* Returns: a GList of features, g_list_free after use.
|
|
*/
|
|
GList *
|
|
gst_plugin_feature_filter (GstPlugin * plugin,
|
|
GstPluginFeatureFilter filter, gboolean first, gpointer user_data)
|
|
{
|
|
GList *list;
|
|
GList *g;
|
|
|
|
list = gst_filter_run (plugin->features, (GstFilterFunc) filter, first,
|
|
user_data);
|
|
for (g = list; g; g = g->next) {
|
|
gst_object_ref (plugin);
|
|
}
|
|
|
|
return list;
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
GstPluginFeatureFilter filter;
|
|
gboolean first;
|
|
gpointer user_data;
|
|
GList *result;
|
|
}
|
|
FeatureFilterData;
|
|
|
|
static gboolean
|
|
_feature_filter (GstPlugin * plugin, gpointer user_data)
|
|
{
|
|
GList *result;
|
|
FeatureFilterData *data = (FeatureFilterData *) user_data;
|
|
|
|
result = gst_plugin_feature_filter (plugin, data->filter, data->first,
|
|
data->user_data);
|
|
if (result) {
|
|
data->result = g_list_concat (data->result, result);
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_list_feature_filter:
|
|
* @list: a #GList of plugins to query
|
|
* @filter: the filter function to use
|
|
* @first: only return first match
|
|
* @user_data: user data passed to the filter function
|
|
*
|
|
* Runs a filter against all plugin features of the plugins in the given
|
|
* list and returns a GList with the results.
|
|
* If the first flag is set, only the first match is
|
|
* returned (as a list with a single object).
|
|
*
|
|
* Returns: a GList of features, g_list_free after use.
|
|
*/
|
|
GList *
|
|
gst_plugin_list_feature_filter (GList * list,
|
|
GstPluginFeatureFilter filter, gboolean first, gpointer user_data)
|
|
{
|
|
FeatureFilterData data;
|
|
GList *result;
|
|
|
|
data.filter = filter;
|
|
data.first = first;
|
|
data.user_data = user_data;
|
|
data.result = NULL;
|
|
|
|
result = gst_filter_run (list, (GstFilterFunc) _feature_filter, first, &data);
|
|
g_list_free (result);
|
|
|
|
return data.result;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* gst_plugin_name_filter:
|
|
* @plugin: the plugin to check
|
|
* @name: the name of the plugin
|
|
*
|
|
* A standard filter that returns TRUE when the plugin is of the
|
|
* given name.
|
|
*
|
|
* Returns: TRUE if the plugin is of the given name.
|
|
*/
|
|
gboolean
|
|
gst_plugin_name_filter (GstPlugin * plugin, const gchar * name)
|
|
{
|
|
return (plugin->desc.name && !strcmp (plugin->desc.name, name));
|
|
}
|
|
|
|
#if 0
|
|
/**
|
|
* gst_plugin_find_feature:
|
|
* @plugin: plugin to get the feature from
|
|
* @name: The name of the feature to find
|
|
* @type: The type of the feature to find
|
|
*
|
|
* Find a feature of the given name and type in the given plugin.
|
|
*
|
|
* Returns: a GstPluginFeature or NULL if the feature was not found.
|
|
*/
|
|
GstPluginFeature *
|
|
gst_plugin_find_feature (GstPlugin * plugin, const gchar * name, GType type)
|
|
{
|
|
GList *walk;
|
|
GstPluginFeature *result = NULL;
|
|
GstTypeNameData data;
|
|
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
data.type = type;
|
|
data.name = name;
|
|
|
|
walk = gst_filter_run (plugin->features,
|
|
(GstFilterFunc) gst_plugin_feature_type_name_filter, TRUE, &data);
|
|
|
|
if (walk) {
|
|
result = GST_PLUGIN_FEATURE (walk->data);
|
|
|
|
gst_object_ref (result);
|
|
gst_plugin_feature_list_free (walk);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
#if 0
|
|
static gboolean
|
|
gst_plugin_feature_name_filter (GstPluginFeature * feature, const gchar * name)
|
|
{
|
|
return !strcmp (name, GST_PLUGIN_FEATURE_NAME (feature));
|
|
}
|
|
#endif
|
|
|
|
#if 0
|
|
/**
|
|
* gst_plugin_find_feature_by_name:
|
|
* @plugin: plugin to get the feature from
|
|
* @name: The name of the feature to find
|
|
*
|
|
* Find a feature of the given name in the given plugin.
|
|
*
|
|
* Returns: a GstPluginFeature or NULL if the feature was not found.
|
|
*/
|
|
GstPluginFeature *
|
|
gst_plugin_find_feature_by_name (GstPlugin * plugin, const gchar * name)
|
|
{
|
|
GList *walk;
|
|
GstPluginFeature *result = NULL;
|
|
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
walk = gst_filter_run (plugin->features,
|
|
(GstFilterFunc) gst_plugin_feature_name_filter, TRUE, (void *) name);
|
|
|
|
if (walk) {
|
|
result = GST_PLUGIN_FEATURE (walk->data);
|
|
|
|
gst_object_ref (result);
|
|
gst_plugin_feature_list_free (walk);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* gst_plugin_load_by_name:
|
|
* @name: name of plugin to load
|
|
*
|
|
* Load the named plugin. Refs the plugin.
|
|
*
|
|
* Returns: A reference to a loaded plugin, or NULL on error.
|
|
*/
|
|
GstPlugin *
|
|
gst_plugin_load_by_name (const gchar * name)
|
|
{
|
|
GstPlugin *plugin, *newplugin;
|
|
GError *error = NULL;
|
|
|
|
GST_DEBUG ("looking up plugin %s in default registry", name);
|
|
plugin = gst_registry_find_plugin (gst_registry_get_default (), name);
|
|
if (plugin) {
|
|
GST_DEBUG ("loading plugin %s from file %s", name, plugin->filename);
|
|
newplugin = gst_plugin_load_file (plugin->filename, &error);
|
|
gst_object_unref (plugin);
|
|
|
|
if (!newplugin) {
|
|
GST_WARNING ("load_plugin error: %s", error->message);
|
|
g_error_free (error);
|
|
return NULL;
|
|
}
|
|
/* newplugin was reffed by load_file */
|
|
return newplugin;
|
|
}
|
|
|
|
GST_DEBUG ("Could not find plugin %s in registry", name);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_load:
|
|
* @plugin: plugin to load
|
|
*
|
|
* Loads @plugin. Note that the *return value* is the loaded plugin; @plugin is
|
|
* untouched. The normal use pattern of this function goes like this:
|
|
*
|
|
* <programlisting>
|
|
* GstPlugin *loaded_plugin;
|
|
* loaded_plugin = gst_plugin_load (plugin);
|
|
* // presumably, we're no longer interested in the potentially-unloaded plugin
|
|
* gst_object_unref (plugin);
|
|
* plugin = loaded_plugin;
|
|
* </programlisting>
|
|
*
|
|
* Returns: A reference to a loaded plugin, or NULL on error.
|
|
*/
|
|
GstPlugin *
|
|
gst_plugin_load (GstPlugin * plugin)
|
|
{
|
|
GError *error = NULL;
|
|
GstPlugin *newplugin;
|
|
|
|
if (gst_plugin_is_loaded (plugin)) {
|
|
return plugin;
|
|
}
|
|
|
|
if (!(newplugin = gst_plugin_load_file (plugin->filename, &error)))
|
|
goto load_error;
|
|
|
|
return newplugin;
|
|
|
|
load_error:
|
|
{
|
|
GST_WARNING ("load_plugin error: %s", error->message);
|
|
g_error_free (error);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_list_free:
|
|
* @list: list of #GstPlugin
|
|
*
|
|
* Unrefs each member of @list, then frees the list.
|
|
*/
|
|
void
|
|
gst_plugin_list_free (GList * list)
|
|
{
|
|
GList *g;
|
|
|
|
for (g = list; g; g = g->next) {
|
|
gst_object_unref (GST_PLUGIN_CAST (g->data));
|
|
}
|
|
g_list_free (list);
|
|
}
|