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gstreamer/gst/gstregistry.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 David A. Schleef <ds@schleef.org>
*
* gstregistry.c: handle registry
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* 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.
*/
/**
* SECTION:gstregistry
* @short_description: Abstract base class for management of #GstPlugin objects
* @see_also: #GstPlugin, #GstPluginFeature
*
* One registry holds the metadata of a set of plugins.
*
* <emphasis role="bold">Design:</emphasis>
*
* The #GstRegistry object is a list of plugins and some functions for dealing
* with them. Each #GstPlugin is matched 1-1 with a file on disk, and may or may
* not be loaded at a given time. There may be multiple #GstRegistry objects,
* but the "default registry" is the only object that has any meaning to the
* core.
*
* The registry file is actually a cache of plugin information. This is
* unlike versions prior to 0.10, where the registry file was the primary source
* of plugin information, and was created by the gst-register command.
*
* The primary source, at all times, of plugin information is each plugin file
* itself. Thus, if an application wants information about a particular plugin,
* or wants to search for a feature that satisfies given criteria, the primary
* means of doing so is to load every plugin and look at the resulting
* information that is gathered in the default registry. Clearly, this is a time
* consuming process, so we cache information in the registry file. The format
* and location of the cache file is internal to gstreamer.
*
* On startup, plugins are searched for in the plugin search path. The following
* locations are checked in this order:
* <itemizedlist>
* <listitem>
* <para>location from --gst-plugin-path commandline option.</para>
* </listitem>
* <listitem>
* <para>the GST_PLUGIN_PATH environment variable.</para>
* </listitem>
* <listitem>
* <para>the GST_PLUGIN_SYSTEM_PATH environment variable.</para>
* </listitem>
* <listitem>
* <para>default locations (if GST_PLUGIN_SYSTEM_PATH is not set). Those
* default locations are:
* <filename>~/.gstreamer-$GST_MAJORMINOR/plugins/</filename>
* and <filename>$prefix/libs/gstreamer-$GST_MAJORMINOR/</filename>.
* </para>
* </listitem>
* </itemizedlist>
* The registry cache file is loaded from
* <filename>~/.gstreamer-$GST_MAJORMINOR/registry-$ARCH.bin</filename> or the
* file listed in the GST_REGISTRY env var. One reason to change the registry
* location is for testing.
*
* For each plugin that is found in the plugin search path, there could be 3
* possibilities for cached information:
* <itemizedlist>
* <listitem>
* <para>the cache may not contain information about a given file.</para>
* </listitem>
* <listitem>
* <para>the cache may have stale information.</para>
* </listitem>
* <listitem>
* <para>the cache may have current information.</para>
* </listitem>
* </itemizedlist>
*
* In the first two cases, the plugin is loaded and the cache updated. In
* addition to these cases, the cache may have entries for plugins that are not
* relevant to the current process. These are marked as not available to the
* current process. If the cache is updated for whatever reason, it is marked
* dirty.
*
* A dirty cache is written out at the end of initialization. Each entry is
* checked to make sure the information is minimally valid. If not, the entry is
* simply dropped.
*
* <emphasis role="bold">Implementation notes:</emphasis>
*
* The "cache" and "default registry" are different concepts and can represent
* different sets of plugins. For various reasons, at init time, the cache is
* stored in the default registry, and plugins not relevant to the current
* process are marked with the %GST_PLUGIN_FLAG_CACHED bit. These plugins are
* removed at the end of intitialization.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstconfig.h"
#include "gst_private.h"
#include <glib.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <string.h>
/* For g_stat () */
#include <glib/gstdio.h>
#include "gstinfo.h"
#include "gsterror.h"
#include "gstregistry.h"
#include "gstmarshal.h"
#include "gstfilter.h"
#include "gstpluginloader.h"
#include "gst-i18n-lib.h"
#include "gst.h"
#include "glib-compat-private.h"
#ifdef G_OS_WIN32
#include <windows.h>
extern HMODULE _priv_gst_dll_handle;
#endif
#define GST_CAT_DEFAULT GST_CAT_REGISTRY
struct _GstRegistryPrivate
{
/* updated whenever the feature list changes */
guint32 cookie;
/* speedup for searching features */
GList *element_factory_list;
guint32 efl_cookie;
GList *typefind_factory_list;
guint32 tfl_cookie;
};
/* the one instance of the default registry and the mutex protecting the
* variable. */
static GStaticMutex _gst_registry_mutex = G_STATIC_MUTEX_INIT;
static GstRegistry *_gst_registry_default = NULL;
/* defaults */
#define DEFAULT_FORK TRUE
/* control the behaviour of registry rebuild */
static gboolean _gst_enable_registry_fork = DEFAULT_FORK;
/* List of plugins that need preloading/reloading after scanning registry */
extern GSList *_priv_gst_preload_plugins;
#ifndef GST_DISABLE_REGISTRY
/*set to TRUE when registry needn't to be updated */
gboolean _priv_gst_disable_registry_update = FALSE;
extern GList *_priv_gst_plugin_paths;
/* Set to TRUE when the registry cache should be disabled */
gboolean _gst_disable_registry_cache = FALSE;
#endif
/* Element signals and args */
enum
{
PLUGIN_ADDED,
FEATURE_ADDED,
LAST_SIGNAL
};
static void gst_registry_finalize (GObject * object);
static guint gst_registry_signals[LAST_SIGNAL] = { 0 };
static GstPluginFeature *gst_registry_lookup_feature_locked (GstRegistry *
registry, const char *name);
static GstPlugin *gst_registry_lookup_bn_locked (GstRegistry * registry,
const char *basename);
G_DEFINE_TYPE (GstRegistry, gst_registry, GST_TYPE_OBJECT);
static GstObjectClass *parent_class = NULL;
static void
gst_registry_class_init (GstRegistryClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
parent_class = g_type_class_peek_parent (klass);
g_type_class_add_private (klass, sizeof (GstRegistryPrivate));
/**
* GstRegistry::plugin-added:
* @registry: the registry that emitted the signal
* @plugin: the plugin that has been added
*
* Signals that a plugin has been added to the registry (possibly
* replacing a previously-added one by the same name)
*/
gst_registry_signals[PLUGIN_ADDED] =
g_signal_new ("plugin-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRegistryClass, plugin_added), NULL,
NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);
/**
* GstRegistry::feature-added:
* @registry: the registry that emitted the signal
* @feature: the feature that has been added
*
* Signals that a feature has been added to the registry (possibly
* replacing a previously-added one by the same name)
*/
gst_registry_signals[FEATURE_ADDED] =
g_signal_new ("feature-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRegistryClass, feature_added),
NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);
gobject_class->finalize = gst_registry_finalize;
}
static void
gst_registry_init (GstRegistry * registry)
{
registry->feature_hash = g_hash_table_new (g_str_hash, g_str_equal);
registry->basename_hash = g_hash_table_new (g_str_hash, g_str_equal);
registry->priv =
G_TYPE_INSTANCE_GET_PRIVATE (registry, GST_TYPE_REGISTRY,
GstRegistryPrivate);
}
static void
gst_registry_finalize (GObject * object)
{
GstRegistry *registry = GST_REGISTRY (object);
GList *plugins, *p;
GList *features, *f;
plugins = registry->plugins;
registry->plugins = NULL;
GST_DEBUG_OBJECT (registry, "registry finalize");
p = plugins;
while (p) {
GstPlugin *plugin = p->data;
if (plugin) {
GST_LOG_OBJECT (registry, "removing plugin %s",
gst_plugin_get_name (plugin));
gst_object_unref (plugin);
}
p = g_list_next (p);
}
g_list_free (plugins);
features = registry->features;
registry->features = NULL;
f = features;
while (f) {
GstPluginFeature *feature = f->data;
if (feature) {
GST_LOG_OBJECT (registry, "removing feature %p (%s)",
feature, gst_plugin_feature_get_name (feature));
gst_object_unref (feature);
}
f = g_list_next (f);
}
g_list_free (features);
g_hash_table_destroy (registry->feature_hash);
registry->feature_hash = NULL;
g_hash_table_destroy (registry->basename_hash);
registry->basename_hash = NULL;
if (registry->priv->element_factory_list) {
GST_DEBUG_OBJECT (registry, "Cleaning up cached element factory list");
gst_plugin_feature_list_free (registry->priv->element_factory_list);
}
if (registry->priv->typefind_factory_list) {
GST_DEBUG_OBJECT (registry, "Cleaning up cached typefind factory list");
gst_plugin_feature_list_free (registry->priv->typefind_factory_list);
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gst_registry_get_default:
*
* Retrieves the default registry. The caller does not own a reference on the
* registry, as it is alive as long as GStreamer is initialized.
*
* Returns: The default #GstRegistry.
*/
GstRegistry *
gst_registry_get_default (void)
{
GstRegistry *registry;
g_static_mutex_lock (&_gst_registry_mutex);
if (G_UNLIKELY (!_gst_registry_default)) {
_gst_registry_default = g_object_newv (GST_TYPE_REGISTRY, 0, NULL);
gst_object_ref_sink (GST_OBJECT_CAST (_gst_registry_default));
}
registry = _gst_registry_default;
g_static_mutex_unlock (&_gst_registry_mutex);
return registry;
}
/**
* gst_registry_add_path:
* @registry: the registry to add the path to
* @path: the path to add to the registry
*
* Add the given path to the registry. The syntax of the
* path is specific to the registry. If the path has already been
* added, do nothing.
*/
void
gst_registry_add_path (GstRegistry * registry, const gchar * path)
{
g_return_if_fail (GST_IS_REGISTRY (registry));
g_return_if_fail (path != NULL);
if (strlen (path) == 0)
goto empty_path;
GST_OBJECT_LOCK (registry);
if (g_list_find_custom (registry->paths, path, (GCompareFunc) strcmp))
goto was_added;
GST_INFO ("Adding plugin path: \"%s\"", path);
registry->paths = g_list_append (registry->paths, g_strdup (path));
GST_OBJECT_UNLOCK (registry);
return;
empty_path:
{
GST_INFO ("Ignoring empty plugin path");
return;
}
was_added:
{
g_warning ("path %s already added to registry", path);
GST_OBJECT_UNLOCK (registry);
return;
}
}
/**
* gst_registry_get_path_list:
* @registry: the registry to get the pathlist of
*
* Get the list of paths for the given registry.
*
* Returns: A Glist of paths as strings. g_list_free after use.
*
* MT safe.
*/
GList *
gst_registry_get_path_list (GstRegistry * registry)
{
GList *list;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
GST_OBJECT_LOCK (registry);
/* We don't need to copy the strings, because they won't be deleted
* as long as the GstRegistry is around */
list = g_list_copy (registry->paths);
GST_OBJECT_UNLOCK (registry);
return list;
}
/**
* gst_registry_add_plugin:
* @registry: the registry to add the plugin to
* @plugin: the plugin to add
*
* Add the plugin to the registry. The plugin-added signal will be emitted.
* This function will sink @plugin.
*
* Returns: TRUE on success.
*
* MT safe.
*/
gboolean
gst_registry_add_plugin (GstRegistry * registry, GstPlugin * plugin)
{
GstPlugin *existing_plugin;
g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
g_return_val_if_fail (GST_IS_PLUGIN (plugin), FALSE);
GST_OBJECT_LOCK (registry);
if (G_LIKELY (plugin->basename)) {
/* we have a basename, see if we find the plugin */
existing_plugin =
gst_registry_lookup_bn_locked (registry, plugin->basename);
if (existing_plugin) {
GST_DEBUG_OBJECT (registry,
"Replacing existing plugin %p with new plugin %p for filename \"%s\"",
existing_plugin, plugin, GST_STR_NULL (plugin->filename));
registry->plugins = g_list_remove (registry->plugins, existing_plugin);
if (G_LIKELY (existing_plugin->basename))
g_hash_table_remove (registry->basename_hash,
existing_plugin->basename);
gst_object_unref (existing_plugin);
}
}
GST_DEBUG_OBJECT (registry, "adding plugin %p for filename \"%s\"",
plugin, GST_STR_NULL (plugin->filename));
registry->plugins = g_list_prepend (registry->plugins, plugin);
if (G_LIKELY (plugin->basename))
g_hash_table_replace (registry->basename_hash, plugin->basename, plugin);
gst_object_ref_sink (plugin);
GST_OBJECT_UNLOCK (registry);
GST_LOG_OBJECT (registry, "emitting plugin-added for filename \"%s\"",
GST_STR_NULL (plugin->filename));
g_signal_emit (registry, gst_registry_signals[PLUGIN_ADDED], 0, plugin);
return TRUE;
}
static void
gst_registry_remove_features_for_plugin_unlocked (GstRegistry * registry,
GstPlugin * plugin)
{
GList *f;
const gchar *name;
g_return_if_fail (GST_IS_REGISTRY (registry));
g_return_if_fail (GST_IS_PLUGIN (plugin));
name = gst_plugin_get_name (plugin);
/* Remove all features for this plugin */
f = registry->features;
while (f != NULL) {
GList *next = g_list_next (f);
GstPluginFeature *feature = f->data;
if (G_UNLIKELY (feature && !strcmp (feature->plugin_name, name))) {
GST_DEBUG_OBJECT (registry, "removing feature %p (%s) for plugin %s",
feature, gst_plugin_feature_get_name (feature), name);
registry->features = g_list_delete_link (registry->features, f);
g_hash_table_remove (registry->feature_hash, feature->name);
gst_object_unref (feature);
}
f = next;
}
registry->priv->cookie++;
}
/**
* gst_registry_remove_plugin:
* @registry: the registry to remove the plugin from
* @plugin: the plugin to remove
*
* Remove the plugin from the registry.
*
* MT safe.
*/
void
gst_registry_remove_plugin (GstRegistry * registry, GstPlugin * plugin)
{
g_return_if_fail (GST_IS_REGISTRY (registry));
g_return_if_fail (GST_IS_PLUGIN (plugin));
GST_DEBUG_OBJECT (registry, "removing plugin %p (%s)",
plugin, gst_plugin_get_name (plugin));
GST_OBJECT_LOCK (registry);
registry->plugins = g_list_remove (registry->plugins, plugin);
if (G_LIKELY (plugin->basename))
g_hash_table_remove (registry->basename_hash, plugin->basename);
gst_registry_remove_features_for_plugin_unlocked (registry, plugin);
GST_OBJECT_UNLOCK (registry);
gst_object_unref (plugin);
}
/**
* gst_registry_add_feature:
* @registry: the registry to add the plugin to
* @feature: the feature to add
*
* Add the feature to the registry. The feature-added signal will be emitted.
* This function sinks @feature.
*
* Returns: TRUE on success.
*
* MT safe.
*/
gboolean
gst_registry_add_feature (GstRegistry * registry, GstPluginFeature * feature)
{
GstPluginFeature *existing_feature;
g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
g_return_val_if_fail (feature->name != NULL, FALSE);
g_return_val_if_fail (feature->plugin_name != NULL, FALSE);
GST_OBJECT_LOCK (registry);
existing_feature = gst_registry_lookup_feature_locked (registry,
feature->name);
if (G_UNLIKELY (existing_feature)) {
GST_DEBUG_OBJECT (registry, "replacing existing feature %p (%s)",
existing_feature, feature->name);
/* Remove the existing feature from the list now, before we insert the new
* one, but don't unref yet because the hash is still storing a reference to
* it. */
registry->features = g_list_remove (registry->features, existing_feature);
}
GST_DEBUG_OBJECT (registry, "adding feature %p (%s)", feature, feature->name);
registry->features = g_list_prepend (registry->features, feature);
g_hash_table_replace (registry->feature_hash, feature->name, feature);
if (G_UNLIKELY (existing_feature)) {
/* We unref now. No need to remove the feature name from the hash table, it
* got replaced by the new feature */
gst_object_unref (existing_feature);
}
gst_object_ref_sink (feature);
registry->priv->cookie++;
GST_OBJECT_UNLOCK (registry);
GST_LOG_OBJECT (registry, "emitting feature-added for %s", feature->name);
g_signal_emit (registry, gst_registry_signals[FEATURE_ADDED], 0, feature);
return TRUE;
}
/**
* gst_registry_remove_feature:
* @registry: the registry to remove the feature from
* @feature: the feature to remove
*
* Remove the feature from the registry.
*
* MT safe.
*/
void
gst_registry_remove_feature (GstRegistry * registry, GstPluginFeature * feature)
{
g_return_if_fail (GST_IS_REGISTRY (registry));
g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
GST_DEBUG_OBJECT (registry, "removing feature %p (%s)",
feature, gst_plugin_feature_get_name (feature));
GST_OBJECT_LOCK (registry);
registry->features = g_list_remove (registry->features, feature);
g_hash_table_remove (registry->feature_hash, feature->name);
registry->priv->cookie++;
GST_OBJECT_UNLOCK (registry);
gst_object_unref (feature);
}
/**
* gst_registry_plugin_filter:
* @registry: registry 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 plugins in the registry 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).
* Every plugin is reffed; use gst_plugin_list_free() after use, which
* will unref again.
*
* Returns: a #GList of #GstPlugin. Use gst_plugin_list_free() after usage.
*
* MT safe.
*/
GList *
gst_registry_plugin_filter (GstRegistry * registry,
GstPluginFilter filter, gboolean first, gpointer user_data)
{
GList *list;
GList *g;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
GST_OBJECT_LOCK (registry);
list = gst_filter_run (registry->plugins, (GstFilterFunc) filter, first,
user_data);
for (g = list; g; g = g->next) {
gst_object_ref (GST_PLUGIN_CAST (g->data));
}
GST_OBJECT_UNLOCK (registry);
return list;
}
/* returns TRUE if the list was changed
*
* Must be called with the object lock taken */
static gboolean
gst_registry_get_feature_list_or_create (GstRegistry * registry,
GList ** previous, guint32 * cookie, GType type)
{
gboolean res = FALSE;
GstRegistryPrivate *priv = registry->priv;
if (G_UNLIKELY (!*previous || priv->cookie != *cookie)) {
GstTypeNameData data;
if (*previous)
gst_plugin_feature_list_free (*previous);
data.type = type;
data.name = NULL;
*previous =
gst_filter_run (registry->features,
(GstFilterFunc) gst_plugin_feature_type_name_filter, FALSE, &data);
g_list_foreach (*previous, (GFunc) gst_object_ref, NULL);
*cookie = priv->cookie;
res = TRUE;
}
return res;
}
static gint
type_find_factory_rank_cmp (const GstPluginFeature * fac1,
const GstPluginFeature * fac2)
{
if (G_LIKELY (fac1->rank != fac2->rank))
return fac2->rank - fac1->rank;
/* to make the order in which things happen more deterministic,
* sort by name when the ranks are the same. */
return strcmp (fac1->name, fac2->name);
}
static GList *
gst_registry_get_element_factory_list (GstRegistry * registry)
{
GList *list;
GST_OBJECT_LOCK (registry);
gst_registry_get_feature_list_or_create (registry,
&registry->priv->element_factory_list, &registry->priv->efl_cookie,
GST_TYPE_ELEMENT_FACTORY);
/* Return reffed copy */
list = gst_plugin_feature_list_copy (registry->priv->element_factory_list);
GST_OBJECT_UNLOCK (registry);
return list;
}
static GList *
gst_registry_get_typefind_factory_list (GstRegistry * registry)
{
GList *list;
GST_OBJECT_LOCK (registry);
if (G_UNLIKELY (gst_registry_get_feature_list_or_create (registry,
&registry->priv->typefind_factory_list,
&registry->priv->tfl_cookie, GST_TYPE_TYPE_FIND_FACTORY)))
registry->priv->typefind_factory_list =
g_list_sort (registry->priv->typefind_factory_list,
(GCompareFunc) type_find_factory_rank_cmp);
/* Return reffed copy */
list = gst_plugin_feature_list_copy (registry->priv->typefind_factory_list);
GST_OBJECT_UNLOCK (registry);
return list;
}
/**
* gst_registry_feature_filter:
* @registry: registry 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 features of the plugins in the registry
* 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 #GstPluginFeature. Use gst_plugin_feature_list_free()
* after usage.
*
* MT safe.
*/
GList *
gst_registry_feature_filter (GstRegistry * registry,
GstPluginFeatureFilter filter, gboolean first, gpointer user_data)
{
GList *list;
GList *g;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
GST_OBJECT_LOCK (registry);
list = gst_filter_run (registry->features, (GstFilterFunc) filter, first,
user_data);
for (g = list; g; g = g->next) {
gst_object_ref (GST_PLUGIN_FEATURE_CAST (g->data));
}
GST_OBJECT_UNLOCK (registry);
return list;
}
/**
* gst_registry_find_plugin:
* @registry: the registry to search
* @name: the plugin name to find
*
* Find the plugin with the given name in the registry.
* The plugin will be reffed; caller is responsible for unreffing.
*
* Returns: The plugin with the given name or NULL if the plugin was not found.
* gst_object_unref() after usage.
*
* MT safe.
*/
GstPlugin *
gst_registry_find_plugin (GstRegistry * registry, const gchar * name)
{
GList *walk;
GstPlugin *result = NULL;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
g_return_val_if_fail (name != NULL, NULL);
walk = gst_registry_plugin_filter (registry,
(GstPluginFilter) gst_plugin_name_filter, TRUE, (gpointer) name);
if (walk) {
result = GST_PLUGIN_CAST (walk->data);
gst_object_ref (result);
gst_plugin_list_free (walk);
}
return result;
}
/**
* gst_registry_find_feature:
* @registry: the registry to search
* @name: the pluginfeature name to find
* @type: the pluginfeature type to find
*
* Find the pluginfeature with the given name and type in the registry.
*
* Returns: The pluginfeature with the given name and type or NULL
* if the plugin was not found. gst_object_unref() after usage.
*
* MT safe.
*/
GstPluginFeature *
gst_registry_find_feature (GstRegistry * registry, const gchar * name,
GType type)
{
GstPluginFeature *feature = NULL;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (g_type_is_a (type, GST_TYPE_PLUGIN_FEATURE), NULL);
feature = gst_registry_lookup_feature (registry, name);
if (feature && !g_type_is_a (G_TYPE_FROM_INSTANCE (feature), type)) {
gst_object_unref (feature);
feature = NULL;
}
return feature;
}
/**
* gst_registry_get_feature_list:
* @registry: a #GstRegistry
* @type: a #GType.
*
* Retrieves a #GList of #GstPluginFeature of @type.
*
* Returns: a #GList of #GstPluginFeature of @type. Use
* gst_plugin_feature_list_free() after usage.
*
* MT safe.
*/
GList *
gst_registry_get_feature_list (GstRegistry * registry, GType type)
{
GstTypeNameData data;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
g_return_val_if_fail (g_type_is_a (type, GST_TYPE_PLUGIN_FEATURE), NULL);
/* Speed up */
if (type == GST_TYPE_ELEMENT_FACTORY)
return gst_registry_get_element_factory_list (registry);
else if (type == GST_TYPE_TYPE_FIND_FACTORY)
return gst_registry_get_typefind_factory_list (registry);
data.type = type;
data.name = NULL;
return gst_registry_feature_filter (registry,
(GstPluginFeatureFilter) gst_plugin_feature_type_name_filter,
FALSE, &data);
}
/**
* gst_registry_get_plugin_list:
* @registry: the registry to search
*
* Get a copy of all plugins registered in the given registry. The refcount
* of each element in the list in incremented.
*
* Returns: a #GList of #GstPlugin. Use gst_plugin_list_free() after usage.
*
* MT safe.
*/
GList *
gst_registry_get_plugin_list (GstRegistry * registry)
{
GList *list;
GList *g;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
GST_OBJECT_LOCK (registry);
list = g_list_copy (registry->plugins);
for (g = list; g; g = g->next) {
gst_object_ref (GST_PLUGIN_CAST (g->data));
}
GST_OBJECT_UNLOCK (registry);
return list;
}
static GstPluginFeature *
gst_registry_lookup_feature_locked (GstRegistry * registry, const char *name)
{
return g_hash_table_lookup (registry->feature_hash, name);
}
/**
* gst_registry_lookup_feature:
* @registry: a #GstRegistry
* @name: a #GstPluginFeature name
*
* Find a #GstPluginFeature with @name in @registry.
*
* Returns: a #GstPluginFeature with its refcount incremented, use
* gst_object_unref() after usage.
*
* MT safe.
*/
GstPluginFeature *
gst_registry_lookup_feature (GstRegistry * registry, const char *name)
{
GstPluginFeature *feature;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
g_return_val_if_fail (name != NULL, NULL);
GST_OBJECT_LOCK (registry);
feature = gst_registry_lookup_feature_locked (registry, name);
if (feature)
gst_object_ref (feature);
GST_OBJECT_UNLOCK (registry);
return feature;
}
static GstPlugin *
gst_registry_lookup_bn_locked (GstRegistry * registry, const char *basename)
{
return g_hash_table_lookup (registry->basename_hash, basename);
}
static GstPlugin *
gst_registry_lookup_bn (GstRegistry * registry, const char *basename)
{
GstPlugin *plugin;
GST_OBJECT_LOCK (registry);
plugin = gst_registry_lookup_bn_locked (registry, basename);
if (plugin)
gst_object_ref (plugin);
GST_OBJECT_UNLOCK (registry);
return plugin;
}
/**
* gst_registry_lookup:
* @registry: the registry to look up in
* @filename: the name of the file to look up
*
* Look up a plugin in the given registry with the given filename.
* If found, plugin is reffed.
*
* Returns: the #GstPlugin if found, or NULL if not. gst_object_unref()
* after usage.
*/
GstPlugin *
gst_registry_lookup (GstRegistry * registry, const char *filename)
{
GstPlugin *plugin;
gchar *basename;
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
g_return_val_if_fail (filename != NULL, NULL);
basename = g_path_get_basename (filename);
if (G_UNLIKELY (basename == NULL))
return NULL;
plugin = gst_registry_lookup_bn (registry, basename);
g_free (basename);
return plugin;
}
typedef enum
{
REGISTRY_SCAN_HELPER_NOT_STARTED = 0,
REGISTRY_SCAN_HELPER_DISABLED,
REGISTRY_SCAN_HELPER_RUNNING
} GstRegistryScanHelperState;
typedef struct
{
GstRegistry *registry;
GstRegistryScanHelperState helper_state;
GstPluginLoader *helper;
gboolean changed;
} GstRegistryScanContext;
static void
init_scan_context (GstRegistryScanContext * context, GstRegistry * registry)
{
gboolean do_fork;
context->registry = registry;
/* see if forking is enabled and set up the scan helper state accordingly */
do_fork = _gst_enable_registry_fork;
if (do_fork) {
const gchar *fork_env;
/* forking enabled, see if it is disabled with an env var */
if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
/* fork enabled for any value different from "no" */
do_fork = strcmp (fork_env, "no") != 0;
}
}
if (do_fork)
context->helper_state = REGISTRY_SCAN_HELPER_NOT_STARTED;
else
context->helper_state = REGISTRY_SCAN_HELPER_DISABLED;
context->helper = NULL;
context->changed = FALSE;
}
static void
clear_scan_context (GstRegistryScanContext * context)
{
if (context->helper) {
context->changed |= _priv_gst_plugin_loader_funcs.destroy (context->helper);
context->helper = NULL;
}
}
static gboolean
gst_registry_scan_plugin_file (GstRegistryScanContext * context,
const gchar * filename, off_t file_size, time_t file_mtime)
{
gboolean changed = FALSE;
GstPlugin *newplugin = NULL;
#ifdef G_OS_WIN32
/* Disable external plugin loader on Windows until it is ported properly. */
context->helper_state = REGISTRY_SCAN_HELPER_DISABLED;
#endif
/* Have a plugin to load - see if the scan-helper needs starting */
if (context->helper_state == REGISTRY_SCAN_HELPER_NOT_STARTED) {
GST_DEBUG ("Starting plugin scanner for file %s", filename);
context->helper = _priv_gst_plugin_loader_funcs.create (context->registry);
if (context->helper != NULL)
context->helper_state = REGISTRY_SCAN_HELPER_RUNNING;
else {
GST_WARNING ("Failed starting plugin scanner. Scanning in-process");
context->helper_state = REGISTRY_SCAN_HELPER_DISABLED;
}
}
if (context->helper_state == REGISTRY_SCAN_HELPER_RUNNING) {
GST_DEBUG ("Using scan-helper to load plugin %s", filename);
if (!_priv_gst_plugin_loader_funcs.load (context->helper,
filename, file_size, file_mtime)) {
g_warning ("External plugin loader failed. This most likely means that "
"the plugin loader helper binary was not found or could not be run. "
"%s", (g_getenv ("GST_PLUGIN_PATH") != NULL) ?
"If you are running an uninstalled GStreamer setup, you might need "
"to update your gst-uninstalled script so that the "
"GST_PLUGIN_SCANNER environment variable gets set." : "");
context->helper_state = REGISTRY_SCAN_HELPER_DISABLED;
}
}
/* Check if the helper is disabled (or just got disabled above) */
if (context->helper_state == REGISTRY_SCAN_HELPER_DISABLED) {
/* Load plugin the old fashioned way... */
/* We don't use a GError here because a failure to load some shared
* objects as plugins is normal (particularly in the uninstalled case)
*/
newplugin = gst_plugin_load_file (filename, NULL);
}
if (newplugin) {
GST_DEBUG_OBJECT (context->registry, "marking new plugin %p as registered",
newplugin);
newplugin->registered = TRUE;
gst_object_unref (newplugin);
changed = TRUE;
}
return changed;
}
static gboolean
is_blacklisted_hidden_directory (const gchar * dirent)
{
if (G_LIKELY (dirent[0] != '.'))
return FALSE;
/* skip the .debug directory, these contain elf files that are not
* useful or worse, can crash dlopen () */
if (strcmp (dirent, ".debug") == 0)
return TRUE;
/* can also skip .git and .deps dirs, those won't contain useful files.
* This speeds up scanning a bit in uninstalled setups. */
if (strcmp (dirent, ".git") == 0 || strcmp (dirent, ".deps") == 0)
return TRUE;
return FALSE;
}
static gboolean
gst_registry_scan_path_level (GstRegistryScanContext * context,
const gchar * path, int level)
{
GDir *dir;
const gchar *dirent;
gchar *filename;
GstPlugin *plugin;
gboolean changed = FALSE;
dir = g_dir_open (path, 0, NULL);
if (!dir)
return FALSE;
while ((dirent = g_dir_read_name (dir))) {
GStatBuf file_status;
filename = g_build_filename (path, dirent, NULL);
if (g_stat (filename, &file_status) < 0) {
/* Plugin will be removed from cache after the scan completes if it
* is still marked 'cached' */
g_free (filename);
continue;
}
if (file_status.st_mode & S_IFDIR) {
if (G_UNLIKELY (is_blacklisted_hidden_directory (dirent))) {
GST_LOG_OBJECT (context->registry, "ignoring %s directory", dirent);
g_free (filename);
continue;
}
/* FIXME 0.11: Don't recurse into directories, this behaviour
* is inconsistent with other PATH environment variables
*/
if (level) {
GST_LOG_OBJECT (context->registry, "recursing into directory %s",
filename);
changed |= gst_registry_scan_path_level (context, filename, level - 1);
} else {
GST_LOG_OBJECT (context->registry, "not recursing into directory %s, "
"recursion level too deep", filename);
}
g_free (filename);
continue;
}
if (!(file_status.st_mode & S_IFREG)) {
GST_LOG_OBJECT (context->registry, "%s is not a regular file, ignoring",
filename);
g_free (filename);
continue;
}
if (!g_str_has_suffix (dirent, G_MODULE_SUFFIX)
#ifdef GST_EXTRA_MODULE_SUFFIX
&& !g_str_has_suffix (dirent, GST_EXTRA_MODULE_SUFFIX)
#endif
) {
GST_LOG_OBJECT (context->registry,
"extension is not recognized as module file, ignoring file %s",
filename);
g_free (filename);
continue;
}
GST_LOG_OBJECT (context->registry, "file %s looks like a possible module",
filename);
/* plug-ins are considered unique by basename; if the given name
* was already seen by the registry, we ignore it */
plugin = gst_registry_lookup_bn (context->registry, dirent);
if (plugin) {
gboolean env_vars_changed, deps_changed = FALSE;
if (plugin->registered) {
GST_DEBUG_OBJECT (context->registry,
"plugin already registered from path \"%s\"",
GST_STR_NULL (plugin->filename));
g_free (filename);
gst_object_unref (plugin);
continue;
}
env_vars_changed = _priv_plugin_deps_env_vars_changed (plugin);
/* If a file with a certain basename is seen on a different path,
* update the plugin to ensure the registry cache will reflect up
* to date information */
if (plugin->file_mtime == file_status.st_mtime &&
plugin->file_size == file_status.st_size && !env_vars_changed &&
!(deps_changed = _priv_plugin_deps_files_changed (plugin)) &&
!strcmp (plugin->filename, filename)) {
GST_LOG_OBJECT (context->registry, "file %s cached", filename);
plugin->flags &= ~GST_PLUGIN_FLAG_CACHED;
GST_LOG_OBJECT (context->registry,
"marking plugin %p as registered as %s", plugin, filename);
plugin->registered = TRUE;
} else {
GST_INFO_OBJECT (context->registry, "cached info for %s is stale",
filename);
GST_DEBUG_OBJECT (context->registry, "mtime %ld != %ld or size %"
G_GINT64_FORMAT " != %" G_GINT64_FORMAT " or external dependency "
"env_vars changed: %d or external dependencies changed: %d"
" or old path %s != new path %s",
plugin->file_mtime, file_status.st_mtime,
(gint64) plugin->file_size, (gint64) file_status.st_size,
env_vars_changed, deps_changed, plugin->filename, filename);
gst_registry_remove_plugin (context->registry, plugin);
changed |= gst_registry_scan_plugin_file (context, filename,
file_status.st_size, file_status.st_mtime);
}
gst_object_unref (plugin);
} else {
GST_DEBUG_OBJECT (context->registry, "file %s not yet in registry",
filename);
changed |= gst_registry_scan_plugin_file (context, filename,
file_status.st_size, file_status.st_mtime);
}
g_free (filename);
}
g_dir_close (dir);
return changed;
}
static gboolean
gst_registry_scan_path_internal (GstRegistryScanContext * context,
const gchar * path)
{
gboolean changed;
GST_DEBUG_OBJECT (context->registry, "scanning path %s", path);
changed = gst_registry_scan_path_level (context, path, 10);
GST_DEBUG_OBJECT (context->registry, "registry changed in path %s: %d", path,
changed);
return changed;
}
/**
* gst_registry_scan_path:
* @registry: the registry to add found plugins to
* @path: the path to scan
*
* Scan the given path for plugins to add to the registry. The syntax of the
* path is specific to the registry.
*
* Returns: %TRUE if registry changed
*/
gboolean
gst_registry_scan_path (GstRegistry * registry, const gchar * path)
{
GstRegistryScanContext context;
gboolean result;
g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
g_return_val_if_fail (path != NULL, FALSE);
init_scan_context (&context, registry);
result = gst_registry_scan_path_internal (&context, path);
clear_scan_context (&context);
result |= context.changed;
return result;
}
static gboolean
_gst_plugin_feature_filter_plugin_name (GstPluginFeature * feature,
gpointer user_data)
{
return (strcmp (feature->plugin_name, (gchar *) user_data) == 0);
}
/**
* gst_registry_get_feature_list_by_plugin:
* @registry: a #GstRegistry.
* @name: a plugin name.
*
* Retrieves a #GList of features of the plugin with name @name.
*
* Returns: a #GList of #GstPluginFeature. Use gst_plugin_feature_list_free()
* after usage.
*/
GList *
gst_registry_get_feature_list_by_plugin (GstRegistry * registry,
const gchar * name)
{
g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
g_return_val_if_fail (name != NULL, NULL);
return gst_registry_feature_filter (registry,
_gst_plugin_feature_filter_plugin_name, FALSE, (gpointer) name);
}
/* Unref and delete the default registry */
void
_priv_gst_registry_cleanup (void)
{
GstRegistry *registry;
g_static_mutex_lock (&_gst_registry_mutex);
if ((registry = _gst_registry_default) != NULL) {
_gst_registry_default = NULL;
}
g_static_mutex_unlock (&_gst_registry_mutex);
/* unref outside of the lock because we can. */
if (registry)
gst_object_unref (registry);
}
/**
* gst_default_registry_check_feature_version:
* @feature_name: the name of the feature (e.g. "oggdemux")
* @min_major: the minimum major version number
* @min_minor: the minimum minor version number
* @min_micro: the minimum micro version number
*
* Checks whether a plugin feature by the given name exists in the
* default registry and whether its version is at least the
* version required.
*
* Returns: #TRUE if the feature could be found and the version is
* the same as the required version or newer, and #FALSE otherwise.
*/
gboolean
gst_default_registry_check_feature_version (const gchar * feature_name,
guint min_major, guint min_minor, guint min_micro)
{
GstPluginFeature *feature;
GstRegistry *registry;
gboolean ret = FALSE;
g_return_val_if_fail (feature_name != NULL, FALSE);
GST_DEBUG ("Looking up plugin feature '%s'", feature_name);
registry = gst_registry_get_default ();
feature = gst_registry_lookup_feature (registry, feature_name);
if (feature) {
ret = gst_plugin_feature_check_version (feature, min_major, min_minor,
min_micro);
gst_object_unref (feature);
} else {
GST_DEBUG ("Could not find plugin feature '%s'", feature_name);
}
return ret;
}
static void
load_plugin_func (gpointer data, gpointer user_data)
{
GstPlugin *plugin;
const gchar *filename;
GError *err = NULL;
filename = (const gchar *) data;
GST_DEBUG ("Pre-loading plugin %s", filename);
plugin = gst_plugin_load_file (filename, &err);
if (plugin) {
GST_INFO ("Loaded plugin: \"%s\"", filename);
gst_default_registry_add_plugin (plugin);
} else {
if (err) {
/* Report error to user, and free error */
GST_ERROR ("Failed to load plugin: %s", err->message);
g_error_free (err);
} else {
GST_WARNING ("Failed to load plugin: \"%s\"", filename);
}
}
}
#ifndef GST_DISABLE_REGISTRY
/* Unref all plugins marked 'cached', to clear old plugins that no
* longer exist. Returns TRUE if any plugins were removed */
static gboolean
gst_registry_remove_cache_plugins (GstRegistry * registry)
{
GList *g;
GList *g_next;
GstPlugin *plugin;
gboolean changed = FALSE;
g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
GST_OBJECT_LOCK (registry);
GST_DEBUG_OBJECT (registry, "removing cached plugins");
g = registry->plugins;
while (g) {
g_next = g->next;
plugin = g->data;
if (plugin->flags & GST_PLUGIN_FLAG_CACHED) {
GST_DEBUG_OBJECT (registry, "removing cached plugin \"%s\"",
GST_STR_NULL (plugin->filename));
registry->plugins = g_list_delete_link (registry->plugins, g);
if (G_LIKELY (plugin->basename))
g_hash_table_remove (registry->basename_hash, plugin->basename);
gst_registry_remove_features_for_plugin_unlocked (registry, plugin);
gst_object_unref (plugin);
changed = TRUE;
}
g = g_next;
}
GST_OBJECT_UNLOCK (registry);
return changed;
}
typedef enum
{
REGISTRY_SCAN_AND_UPDATE_FAILURE = 0,
REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED,
REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED
} GstRegistryScanAndUpdateResult;
/*
* scan_and_update_registry:
* @default_registry: the #GstRegistry
* @registry_file: registry filename
* @write_changes: write registry if it has changed?
*
* Scans for registry changes and eventually updates the registry cache.
*
* Return: %REGISTRY_SCAN_AND_UPDATE_FAILURE if the registry could not scanned
* or updated, %REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED if the
* registry is clean and %REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED if
* it has been updated and the cache needs to be re-read.
*/
static GstRegistryScanAndUpdateResult
scan_and_update_registry (GstRegistry * default_registry,
const gchar * registry_file, gboolean write_changes, GError ** error)
{
const gchar *plugin_path;
gboolean changed = FALSE;
GList *l;
GstRegistryScanContext context;
GST_INFO ("Validating plugins from registry cache: %s", registry_file);
init_scan_context (&context, default_registry);
/* It sounds tempting to just compare the mtime of directories with the mtime
* of the registry cache, but it does not work. It would not catch updated
* plugins, which might bring more or less features.
*/
/* scan paths specified via --gst-plugin-path */
GST_DEBUG ("scanning paths added via --gst-plugin-path");
for (l = _priv_gst_plugin_paths; l != NULL; l = l->next) {
GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
changed |= gst_registry_scan_path_internal (&context, (gchar *) l->data);
}
/* keep plugin_paths around in case a re-scan is forced later on */
/* GST_PLUGIN_PATH specifies a list of directories to scan for
* additional plugins. These take precedence over the system plugins */
plugin_path = g_getenv ("GST_PLUGIN_PATH");
if (plugin_path) {
char **list;
int i;
GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
for (i = 0; list[i]; i++) {
changed |= gst_registry_scan_path_internal (&context, list[i]);
}
g_strfreev (list);
} else {
GST_DEBUG ("GST_PLUGIN_PATH not set");
}
/* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
* loaded by default. If not set, this defaults to the system-installed
* path, and the plugins installed in the user's home directory */
plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
if (plugin_path == NULL) {
char *home_plugins;
GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
/* plugins in the user's home directory take precedence over
* system-installed ones */
home_plugins = g_build_filename (g_get_home_dir (),
".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
GST_DEBUG ("scanning home plugins %s", home_plugins);
changed |= gst_registry_scan_path_internal (&context, home_plugins);
g_free (home_plugins);
/* add the main (installed) library path */
GST_DEBUG ("scanning main plugins %s", PLUGINDIR);
changed |= gst_registry_scan_path_internal (&context, PLUGINDIR);
#ifdef G_OS_WIN32
{
char *base_dir;
char *dir;
base_dir =
g_win32_get_package_installation_directory_of_module
(_priv_gst_dll_handle);
dir = g_build_filename (base_dir, "lib", "gstreamer-0.10", NULL);
GST_DEBUG ("scanning DLL dir %s", dir);
changed |= gst_registry_scan_path_internal (&context, dir);
g_free (dir);
g_free (base_dir);
}
#endif
} else {
gchar **list;
gint i;
GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
for (i = 0; list[i]; i++) {
changed |= gst_registry_scan_path_internal (&context, list[i]);
}
g_strfreev (list);
}
clear_scan_context (&context);
changed |= context.changed;
/* Remove cached plugins so stale info is cleared. */
changed |= gst_registry_remove_cache_plugins (default_registry);
if (!changed) {
GST_INFO ("Registry cache has not changed");
return REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED;
}
if (!write_changes) {
GST_INFO ("Registry cache changed, but writing is disabled. Not writing.");
return REGISTRY_SCAN_AND_UPDATE_FAILURE;
}
GST_INFO ("Registry cache changed. Writing new registry cache");
if (!gst_registry_binary_write_cache (default_registry, registry_file)) {
g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
_("Error writing registry cache to %s: %s"),
registry_file, g_strerror (errno));
return REGISTRY_SCAN_AND_UPDATE_FAILURE;
}
GST_INFO ("Registry cache written successfully");
return REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED;
}
static gboolean
ensure_current_registry (GError ** error)
{
gchar *registry_file;
GstRegistry *default_registry;
gboolean ret = TRUE;
gboolean do_update = TRUE;
gboolean have_cache = TRUE;
default_registry = gst_registry_get_default ();
registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
if (registry_file == NULL) {
registry_file = g_build_filename (g_get_home_dir (),
".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".bin", NULL);
}
if (!_gst_disable_registry_cache) {
GST_INFO ("reading registry cache: %s", registry_file);
have_cache = gst_registry_binary_read_cache (default_registry,
registry_file);
/* Only ever read the registry cache once, then disable it for
* subsequent updates during the program lifetime */
_gst_disable_registry_cache = TRUE;
}
if (have_cache) {
do_update = !_priv_gst_disable_registry_update;
if (do_update) {
const gchar *update_env;
if ((update_env = g_getenv ("GST_REGISTRY_UPDATE"))) {
/* do update for any value different from "no" */
do_update = (strcmp (update_env, "no") != 0);
}
}
}
if (do_update) {
/* now check registry */
GST_DEBUG ("Updating registry cache");
scan_and_update_registry (default_registry, registry_file, TRUE, error);
} else {
GST_DEBUG ("Not updating registry cache (disabled)");
}
g_free (registry_file);
GST_INFO ("registry reading and updating done, result = %d", ret);
return ret;
}
#endif /* GST_DISABLE_REGISTRY */
/**
* gst_registry_fork_is_enabled:
*
* By default GStreamer will perform scanning and rebuilding of the
* registry file using a helper child process.
*
* Applications might want to disable this behaviour with the
* gst_registry_fork_set_enabled() function, in which case new plugins
* are scanned (and loaded) into the application process.
*
* Returns: %TRUE if GStreamer will use the child helper process when
* rebuilding the registry.
*
* Since: 0.10.10
*/
gboolean
gst_registry_fork_is_enabled (void)
{
return _gst_enable_registry_fork;
}
/**
* gst_registry_fork_set_enabled:
* @enabled: whether rebuilding the registry can use a temporary child helper process.
*
* Applications might want to disable/enable spawning of a child helper process
* when rebuilding the registry. See gst_registry_fork_is_enabled() for more
* information.
*
* Since: 0.10.10
*/
void
gst_registry_fork_set_enabled (gboolean enabled)
{
_gst_enable_registry_fork = enabled;
}
/**
* gst_update_registry:
*
* Forces GStreamer to re-scan its plugin paths and update the default
* plugin registry.
*
* Applications will almost never need to call this function, it is only
* useful if the application knows new plugins have been installed (or old
* ones removed) since the start of the application (or, to be precise, the
* first call to gst_init()) and the application wants to make use of any
* newly-installed plugins without restarting the application.
*
* Applications should assume that the registry update is neither atomic nor
* thread-safe and should therefore not have any dynamic pipelines running
* (including the playbin and decodebin elements) and should also not create
* any elements or access the GStreamer registry while the update is in
* progress.
*
* Note that this function may block for a significant amount of time.
*
* Returns: %TRUE if the registry has been updated successfully (does not
* imply that there were changes), otherwise %FALSE.
*
* Since: 0.10.12
*/
gboolean
gst_update_registry (void)
{
gboolean res;
#ifndef GST_DISABLE_REGISTRY
GError *err = NULL;
res = ensure_current_registry (&err);
if (err) {
GST_WARNING ("registry update failed: %s", err->message);
g_error_free (err);
} else {
GST_LOG ("registry update succeeded");
}
#else
GST_WARNING ("registry update failed: %s", "registry disabled");
res = TRUE;
#endif /* GST_DISABLE_REGISTRY */
if (_priv_gst_preload_plugins) {
GST_DEBUG ("Preloading indicated plugins...");
g_slist_foreach (_priv_gst_preload_plugins, load_plugin_func, NULL);
}
return res;
}
/**
* gst_registry_get_feature_list_cookie:
* @registry: the registry
*
* Returns the registrys feature list cookie. This changes
* every time a feature is added or removed from the registry.
*
* Returns: the feature list cookie.
*
* Since: 0.10.26
*/
guint32
gst_registry_get_feature_list_cookie (GstRegistry * registry)
{
g_return_val_if_fail (GST_IS_REGISTRY (registry), 0);
return registry->priv->cookie;
}
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