2 * Copyright (C) 2013 Stefan Sauer <ensonic@users.sf.net>
4 * gsttracer.c: tracer base class
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
25 * @short_description: Tracing base class
27 * Tracing modules will subclass #GstTracer and register through
28 * gst_tracer_register(). Modules can attach to various hook-types - see
29 * gst_tracing_register_hook(). When invoked they receive hook specific
30 * contextual data, which they must not modify.
35 #include "gst_private.h"
36 #include "gstenumtypes.h"
37 #include "gsttracer.h"
38 #include "gsttracerfactory.h"
39 #include "gsttracerutils.h"
41 GST_DEBUG_CATEGORY_EXTERN (tracer_debug);
42 #define GST_CAT_DEFAULT tracer_debug
44 /* tracing plugins base class */
53 static GParamSpec *properties[PROP_LAST];
55 static void gst_tracer_set_property (GObject * object, guint prop_id,
56 const GValue * value, GParamSpec * pspec);
57 static void gst_tracer_get_property (GObject * object, guint prop_id,
58 GValue * value, GParamSpec * pspec);
60 struct _GstTracerPrivate
65 #define gst_tracer_parent_class parent_class
66 G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GstTracer, gst_tracer, GST_TYPE_OBJECT);
69 gst_tracer_dispose (GObject * object)
71 GstTracer *tracer = GST_TRACER (object);
72 g_free (tracer->priv->params);
76 gst_tracer_class_init (GstTracerClass * klass)
78 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
80 gobject_class->set_property = gst_tracer_set_property;
81 gobject_class->get_property = gst_tracer_get_property;
82 gobject_class->dispose = gst_tracer_dispose;
84 properties[PROP_PARAMS] =
85 g_param_spec_string ("params", "Params", "Extra configuration parameters",
86 NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS);
88 g_object_class_install_properties (gobject_class, PROP_LAST, properties);
92 gst_tracer_init (GstTracer * tracer)
94 tracer->priv = gst_tracer_get_instance_private (tracer);
98 gst_tracer_set_property (GObject * object, guint prop_id,
99 const GValue * value, GParamSpec * pspec)
101 GstTracer *self = GST_TRACER_CAST (object);
105 self->priv->params = g_value_dup_string (value);
108 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
114 gst_tracer_get_property (GObject * object, guint prop_id,
115 GValue * value, GParamSpec * pspec)
117 GstTracer *self = GST_TRACER_CAST (object);
121 g_value_set_string (value, self->priv->params);
124 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
129 /* tracing modules */
132 * gst_tracer_register:
133 * @plugin: (allow-none): A #GstPlugin, or %NULL for a static typefind function
134 * @name: The name for registering
135 * @type: GType of tracer to register
137 * Create a new tracer-factory capable of instantiating objects of the
138 * @type and add the factory to @plugin.
140 * Returns: %TRUE, if the registering succeeded, %FALSE on error
143 gst_tracer_register (GstPlugin * plugin, const gchar * name, GType type)
145 GstPluginFeature *existing_feature;
146 GstRegistry *registry;
147 GstTracerFactory *factory;
149 g_return_val_if_fail (name != NULL, FALSE);
150 g_return_val_if_fail (g_type_is_a (type, GST_TYPE_TRACER), FALSE);
152 registry = gst_registry_get ();
153 /* check if feature already exists, if it exists there is no need to update it
154 * when the registry is getting updated, outdated plugins and all their
155 * features are removed and readded.
157 existing_feature = gst_registry_lookup_feature (registry, name);
158 if (existing_feature) {
159 GST_DEBUG_OBJECT (registry, "update existing feature %p (%s)",
160 existing_feature, name);
161 factory = GST_TRACER_FACTORY_CAST (existing_feature);
162 factory->type = type;
163 existing_feature->loaded = TRUE;
164 gst_object_unref (existing_feature);
168 factory = g_object_new (GST_TYPE_TRACER_FACTORY, NULL);
169 GST_DEBUG_OBJECT (factory, "new tracer factory for %s", name);
171 gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
172 gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory),
175 factory->type = type;
176 GST_DEBUG_OBJECT (factory, "tracer factory for %u:%s",
177 (guint) type, g_type_name (type));
179 if (plugin && plugin->desc.name) {
180 GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name; /* interned string */
181 GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
182 g_object_add_weak_pointer ((GObject *) plugin,
183 (gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
185 GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
186 GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
188 GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
190 gst_registry_add_feature (gst_registry_get (),
191 GST_PLUGIN_FEATURE_CAST (factory));