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/* GStreamer
* Copyright (C) 2013 Stefan Sauer <ensonic@users.sf.net>
*
* gsttracer.c: tracer base class
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gsttracer
* @short_description: Tracing base class
*
* Tracing modules will subclass #GstTracer and register through
* gst_tracing_register(). Modules can attach to various hook-types - see
* gst_tracing_register_hook(). When invoked they receive hook specific
* contextual data, which they must not modify.
*
* Since: 1.8
*/
#define GST_USE_UNSTABLE_API
#include "gst_private.h"
#include "gstenumtypes.h"
#include "gsttracer.h"
#include "gsttracerfactory.h"
#include "gsttracerutils.h"
GST_DEBUG_CATEGORY_EXTERN (tracer_debug);
#define GST_CAT_DEFAULT tracer_debug
/* tracing plugins base class */
enum
{
PROP_0,
PROP_PARAMS,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void gst_tracer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_tracer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
struct _GstTracerPrivate
{
gchar *params;
};
#define gst_tracer_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE (GstTracer, gst_tracer, GST_TYPE_OBJECT);
static void
gst_tracer_dispose (GObject * object)
{
GstTracer *tracer = GST_TRACER (object);
g_free (tracer->priv->params);
}
static void
gst_tracer_class_init (GstTracerClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_tracer_set_property;
gobject_class->get_property = gst_tracer_get_property;
gobject_class->dispose = gst_tracer_dispose;
properties[PROP_PARAMS] =
g_param_spec_string ("params", "Params", "Extra configuration parameters",
NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, PROP_LAST, properties);
g_type_class_add_private (klass, sizeof (GstTracerPrivate));
}
static void
gst_tracer_init (GstTracer * tracer)
{
tracer->priv = G_TYPE_INSTANCE_GET_PRIVATE (tracer, GST_TYPE_TRACER,
GstTracerPrivate);
}
static void
gst_tracer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTracer *self = GST_TRACER_CAST (object);
switch (prop_id) {
case PROP_PARAMS:
self->priv->params = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_tracer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTracer *self = GST_TRACER_CAST (object);
switch (prop_id) {
case PROP_PARAMS:
g_value_set_string (value, self->priv->params);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* tracing modules */
/**
* gst_tracer_register:
* @plugin: (allow-none): A #GstPlugin, or %NULL for a static typefind function
* @name: The name for registering
* @type: GType of tracer to register
*
* Create a new tracer-factory capable of instantiating objects of the
* @type and add the factory to @plugin.
*
* Returns: %TRUE, if the registering succeeded, %FALSE on error
*/
gboolean
gst_tracer_register (GstPlugin * plugin, const gchar * name, GType type)
{
GstPluginFeature *existing_feature;
GstRegistry *registry;
GstTracerFactory *factory;
g_return_val_if_fail (name != NULL, FALSE);
g_return_val_if_fail (g_type_is_a (type, GST_TYPE_TRACER), FALSE);
registry = gst_registry_get ();
/* check if feature already exists, if it exists there is no need to update it
* when the registry is getting updated, outdated plugins and all their
* features are removed and readded.
*/
existing_feature = gst_registry_lookup_feature (registry, name);
if (existing_feature) {
GST_DEBUG_OBJECT (registry, "update existing feature %p (%s)",
existing_feature, name);
factory = GST_TRACER_FACTORY_CAST (existing_feature);
factory->type = type;
existing_feature->loaded = TRUE;
gst_object_unref (existing_feature);
return TRUE;
}
factory = g_object_newv (GST_TYPE_TRACER_FACTORY, 0, NULL);
GST_DEBUG_OBJECT (factory, "new tracer factory for %s", name);
gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory),
GST_RANK_NONE);
factory->type = type;
GST_DEBUG_OBJECT (factory, "tracer factory for %u:%s",
(guint) type, g_type_name (type));
if (plugin && plugin->desc.name) {
GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name; /* interned string */
GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
g_object_add_weak_pointer ((GObject *) plugin,
(gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
} else {
GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
}
GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
gst_registry_add_feature (gst_registry_get (),
GST_PLUGIN_FEATURE_CAST (factory));
return TRUE;
}
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