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196 lines
5.7 KiB
C
196 lines
5.7 KiB
C
/* GStreamer
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* Copyright (C) 2013 Stefan Sauer <ensonic@users.sf.net>
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*
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* gsttracer.c: tracer base class
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gsttracer
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* @title: GstTracer
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* @short_description: Tracing base class
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*
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* Tracing modules will subclass #GstTracer and register through
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* gst_tracer_register(). Modules can attach to various hook-types - see
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* gst_tracing_register_hook(). When invoked they receive hook specific
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* contextual data, which they must not modify.
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*
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* Since: 1.8
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*/
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#define GST_USE_UNSTABLE_API
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#include "gst_private.h"
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#include "gstenumtypes.h"
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#include "gsttracer.h"
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#include "gsttracerfactory.h"
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#include "gsttracerutils.h"
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GST_DEBUG_CATEGORY_EXTERN (tracer_debug);
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#define GST_CAT_DEFAULT tracer_debug
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/* tracing plugins base class */
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enum
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{
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PROP_0,
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PROP_PARAMS,
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PROP_LAST
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};
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static GParamSpec *properties[PROP_LAST];
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static void gst_tracer_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_tracer_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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struct _GstTracerPrivate
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{
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gchar *params;
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};
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#define gst_tracer_parent_class parent_class
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G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GstTracer, gst_tracer, GST_TYPE_OBJECT);
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static void
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gst_tracer_dispose (GObject * object)
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{
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GstTracer *tracer = GST_TRACER (object);
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g_free (tracer->priv->params);
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}
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static void
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gst_tracer_class_init (GstTracerClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->set_property = gst_tracer_set_property;
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gobject_class->get_property = gst_tracer_get_property;
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gobject_class->dispose = gst_tracer_dispose;
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properties[PROP_PARAMS] =
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g_param_spec_string ("params", "Params", "Extra configuration parameters",
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NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, PROP_LAST, properties);
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}
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static void
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gst_tracer_init (GstTracer * tracer)
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{
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tracer->priv = gst_tracer_get_instance_private (tracer);
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}
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static void
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gst_tracer_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstTracer *self = GST_TRACER_CAST (object);
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switch (prop_id) {
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case PROP_PARAMS:
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self->priv->params = g_value_dup_string (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_tracer_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstTracer *self = GST_TRACER_CAST (object);
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switch (prop_id) {
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case PROP_PARAMS:
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g_value_set_string (value, self->priv->params);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* tracing modules */
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/**
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* gst_tracer_register:
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* @plugin: (allow-none): A #GstPlugin, or %NULL for a static typefind function
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* @name: The name for registering
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* @type: GType of tracer to register
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*
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* Create a new tracer-factory capable of instantiating objects of the
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* @type and add the factory to @plugin.
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*
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* Returns: %TRUE, if the registering succeeded, %FALSE on error
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*/
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gboolean
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gst_tracer_register (GstPlugin * plugin, const gchar * name, GType type)
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{
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GstPluginFeature *existing_feature;
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GstRegistry *registry;
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GstTracerFactory *factory;
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g_return_val_if_fail (name != NULL, FALSE);
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g_return_val_if_fail (g_type_is_a (type, GST_TYPE_TRACER), FALSE);
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registry = gst_registry_get ();
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/* check if feature already exists, if it exists there is no need to update it
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* when the registry is getting updated, outdated plugins and all their
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* features are removed and readded.
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*/
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existing_feature = gst_registry_lookup_feature (registry, name);
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if (existing_feature) {
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GST_DEBUG_OBJECT (registry, "update existing feature %p (%s)",
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existing_feature, name);
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factory = GST_TRACER_FACTORY_CAST (existing_feature);
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factory->type = type;
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existing_feature->loaded = TRUE;
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gst_object_unref (existing_feature);
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return TRUE;
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}
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factory = g_object_new (GST_TYPE_TRACER_FACTORY, NULL);
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GST_DEBUG_OBJECT (factory, "new tracer factory for %s", name);
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gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
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gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory),
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GST_RANK_NONE);
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factory->type = type;
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GST_DEBUG_OBJECT (factory, "tracer factory for %u:%s",
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(guint) type, g_type_name (type));
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if (plugin && plugin->desc.name) {
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GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name; /* interned string */
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GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
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g_object_add_weak_pointer ((GObject *) plugin,
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(gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
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} else {
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GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
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GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
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}
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GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
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gst_registry_add_feature (gst_registry_get (),
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GST_PLUGIN_FEATURE_CAST (factory));
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return TRUE;
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}
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