gstreamer/gst/gsturi.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gsturi.c: register URI handlers
*
* 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.
*/
#include "gst_private.h"
#include "gsturi.h"
#include "gstregistrypool.h"
#include "gstinfo.h"
static void gst_uri_handler_class_init (GstURIHandlerClass *klass);
static void gst_uri_handler_init (GstURIHandler *factory);
static GstPluginFeatureClass *parent_class = NULL;
/* static guint gst_uri_handler_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_uri_handler_get_type (void)
{
static GType urihandler_type = 0;
if (!urihandler_type) {
static const GTypeInfo urihandler_info = {
sizeof (GstURIHandlerClass),
NULL,
NULL,
(GClassInitFunc) gst_uri_handler_class_init,
NULL,
NULL,
sizeof(GstURIHandler),
0,
(GInstanceInitFunc) gst_uri_handler_init,
NULL
};
urihandler_type = g_type_register_static (GST_TYPE_PLUGIN_FEATURE,
"GstURIHandler", &urihandler_info, 0);
}
return urihandler_type;
}
static void
gst_uri_handler_class_init (GstURIHandlerClass *klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstPluginFeatureClass *gstpluginfeature_class;
gobject_class = (GObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
gstpluginfeature_class = (GstPluginFeatureClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_PLUGIN_FEATURE);
}
static void
gst_uri_handler_init (GstURIHandler *factory)
{
}
/**
* gst_uri_handler_new:
* @name: the name of the feature
* @uri: the uri to register
* @longdesc: a description for this uri
* @element: an element that can handle the uri
* @property: the property on the element to set the uri
*
* Creates a plugin feature to register an element that can
* handle the given uri on the given property.
*
* Returns: the new urihandler
*/
GstURIHandler*
gst_uri_handler_new (const gchar *name,
const gchar *uri, const gchar *longdesc,
const gchar *element, gchar *property)
{
GstURIHandler *factory;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (uri != NULL, NULL);
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (property != NULL, NULL);
factory = gst_uri_handler_find (name);
if (!factory) {
factory = GST_URI_HANDLER (g_object_new (GST_TYPE_URI_HANDLER, NULL));
}
GST_PLUGIN_FEATURE_NAME (factory) = g_strdup (name);
factory->uri = g_strdup (uri);
factory->longdesc = g_strdup (longdesc);
factory->element = g_strdup (element);
factory->property = g_strdup (property);
return factory;
}
/**
* gst_uri_handler_find:
* @name: the name of the urihandler to find
*
* Return the URIHandler with the given name.
*
* Returns: a GstURIHandler with the given name;
*/
GstURIHandler*
gst_uri_handler_find (const gchar *name)
{
GstPluginFeature *feature;
g_return_val_if_fail (name != NULL, NULL);
feature = gst_registry_pool_find_feature (name, GST_TYPE_URI_HANDLER);
if (feature)
return GST_URI_HANDLER (feature);
return NULL;
}
/*
* this is a straight copy from glib 2.2
* remove this function when glib 2.2 is sufficiently widespread and
* then change to using the regular g_str_has_prefix
*/
static gboolean
g_str_has_prefix_glib22 (gchar *haystack, gchar *needle)
{
if (haystack == NULL && needle == NULL) {
return TRUE;
}
if (haystack == NULL || needle == NULL) {
return FALSE;
}
if (strncmp (haystack, needle, strlen (needle)) == 0) {
return TRUE;
}
return FALSE;
}
/**
* gst_uri_handler_uri_filter:
* @feature: the feature to inspect
* @uri: the name of the uri to match
*
* Check if the given pluginfeature is a uri hanler and that
* it can handle the given uri.
*
* Returns: TRUE if the feature can handle the uri.
*/
gboolean
gst_uri_handler_uri_filter (GstPluginFeature *feature, const gchar *uri)
{
if (G_OBJECT_TYPE (feature) == GST_TYPE_URI_HANDLER) {
GstURIHandler *handler = GST_URI_HANDLER (feature);
if (g_str_has_prefix_glib22 ((gchar *) uri, handler->uri)) {
return TRUE;
}
}
return FALSE;
}
/**
* gst_uri_handler_find_by_uri:
* @uri: the uri to find a handler for
*
* Find a URIHandler for the given uri.
*
* Returns: a GstURIHandler that can handle the given uri.
*/
GstURIHandler*
gst_uri_handler_find_by_uri (const gchar *uri)
{
GList *walk;
GstURIHandler *result = NULL;
g_return_val_if_fail (uri != NULL, NULL);
walk = gst_registry_pool_feature_filter (
(GstPluginFeatureFilter) gst_uri_handler_uri_filter, TRUE, (gpointer) uri);
if (walk) {
result = GST_URI_HANDLER (walk->data);
}
g_list_free (walk);
return result;
}
/**
* gst_uri_handler_create:
* @handler: the uri handler to use
* @name: the name of the element
*
* Create an element with the given name from the given handler.
*
* Returns: a new element associated with the handler.
*/
GstElement*
gst_uri_handler_create (GstURIHandler *handler, const gchar *name)
{
GstElement *element = NULL;
g_return_val_if_fail (handler != NULL, NULL);
element = gst_element_factory_make (handler->element, name);
return element;
}
/**
* gst_uri_handler_make_by_uri:
* @uri: the uri
* @name: the name of the element
*
* Create an element with the given name that can handle the given
* uri. This function will also use set the uri on the element.
*
* Returns: a new element that can handle the uri.
*/
GstElement*
gst_uri_handler_make_by_uri (const gchar *uri, const gchar *name)
{
GstElement *element = NULL;
GstURIHandler *handler;
g_return_val_if_fail (uri != NULL, NULL);
handler = gst_uri_handler_find_by_uri (uri);
if (handler) {
element = gst_uri_handler_create (handler, name);
if (element) {
g_object_set (G_OBJECT (element), handler->property, uri, NULL);
}
}
return element;
}