mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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beb197fd35
Original commit message from CVS: * gst/autoplug/gstspider.c: (gst_spider_link_add): don't ref the element, adding already reffed it. And we didn't unref it later anyway... (huge memleak when you used many spider elements) * gst/gstelement.c: (gst_element_base_class_finalize): * gst/gstelementfactory.c: (gst_element_factory_cleanup), (gst_element_register): * gst/gsturi.c: (gst_element_make_from_uri): use gst_object_(un)ref instead of g_object(un)ref
408 lines
10 KiB
C
408 lines
10 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gsturi.c: register URI handlers
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "gsturi.h"
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#include "gstinfo.h"
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#include "gstregistrypool.h"
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#include "gstmarshal.h"
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (gst_uri_handler_debug);
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#define GST_CAT_DEFAULT gst_uri_handler_debug
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static void gst_uri_handler_base_init (gpointer g_class);
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GType
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gst_uri_handler_get_type (void)
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{
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static GType urihandler_type = 0;
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if (!urihandler_type) {
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static const GTypeInfo urihandler_info = {
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sizeof (GstURIHandlerInterface),
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gst_uri_handler_base_init,
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NULL,
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NULL,
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NULL,
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NULL,
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0,
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0,
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NULL,
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NULL
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};
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urihandler_type = g_type_register_static (G_TYPE_INTERFACE,
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"GstURIHandler", &urihandler_info, 0);
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GST_DEBUG_CATEGORY_INIT (gst_uri_handler_debug, "GST_URI", GST_DEBUG_BOLD,
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"handling of URIs");
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}
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return urihandler_type;
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}
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static void
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gst_uri_handler_base_init (gpointer g_class)
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{
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static gboolean initialized = FALSE;
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if (!initialized) {
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g_signal_new ("new-uri", GST_TYPE_URI_HANDLER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstURIHandlerInterface, new_uri), NULL, NULL,
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gst_marshal_VOID__STRING, G_TYPE_NONE, 1, G_TYPE_STRING);
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initialized = TRUE;
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}
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}
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static void
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gst_uri_protocol_check_internal (const gchar * uri, gchar ** endptr)
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{
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gchar *check = (gchar *) uri;
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g_assert (uri != NULL);
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g_assert (endptr != NULL);
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if (g_ascii_isalpha (*check)) {
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check++;
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while (g_ascii_isalnum (*check))
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check++;
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}
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*endptr = check;
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}
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/**
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* gst_uri_protocol_is_valid:
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* @protocol: string to check
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*
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* Tests if the given string is a valid protocol identifier. Protocols
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* must consist of alphanumeric characters and not start with a number.
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*
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* Returns: TRUE if the string is a valid protocol identifier
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*/
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gboolean
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gst_uri_protocol_is_valid (const gchar * protocol)
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{
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gchar *endptr;
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g_return_val_if_fail (protocol != NULL, FALSE);
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gst_uri_protocol_check_internal (protocol, &endptr);
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return *endptr == '\0' && endptr != protocol;
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}
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/**
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* gst_uri_is_valid:
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* @uri: string to check
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*
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* Tests if the given string is a valid URI identifier. URIs start with a valid
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* protocol followed by "://" and a string identifying the location.
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*
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* Returns: TRUE if the string is a valid URI
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*/
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gboolean
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gst_uri_is_valid (const gchar * uri)
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{
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gchar *endptr;
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g_return_val_if_fail (uri != NULL, FALSE);
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gst_uri_protocol_check_internal (uri, &endptr);
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return (*endptr == ':' && *(endptr + 1) == '/' && *(endptr + 2) == '/');
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}
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/**
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* gst_uri_get_protocol:
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* @uri: URI to get protocol from
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*
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* Extracts the protocol out of a given valid URI. The returned string must be
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* freed using g_free().
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*
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* Returns: The protocol for this URI.
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*/
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gchar *
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gst_uri_get_protocol (const gchar * uri)
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{
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gchar *colon;
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g_return_val_if_fail (uri != NULL, NULL);
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g_return_val_if_fail (gst_uri_is_valid (uri), NULL);
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colon = strstr (uri, "://");
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return g_strndup (uri, colon - uri);
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}
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/**
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* gst_uri_get_location:
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* @uri: URI to get the location from
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*
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* Extracts the location out of a given valid URI. So the protocol and "://"
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* are stripped from the URI. The returned string must be freed using
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* g_free().
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*
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* Returns: The location for this URI.
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*/
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gchar *
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gst_uri_get_location (const gchar * uri)
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{
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gchar *colon;
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g_return_val_if_fail (uri != NULL, NULL);
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g_return_val_if_fail (gst_uri_is_valid (uri), NULL);
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colon = strstr (uri, "://");
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return g_strdup (colon + 3);
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}
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/**
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* gst_uri_construct:
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* @protocol: protocol for URI
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* @location: location for URI
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*
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* Constructs a URI for a given valid protocol and location.
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*
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* Returns: a new string for this URI
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*/
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gchar *
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gst_uri_construct (const gchar * protocol, const gchar * location)
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{
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g_return_val_if_fail (gst_uri_protocol_is_valid (protocol), NULL);
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g_return_val_if_fail (location != NULL, NULL);
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return g_strdup_printf ("%s://%s", protocol, location);
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}
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typedef struct
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{
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GstURIType type;
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gchar *protocol;
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}
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SearchEntry;
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static gboolean
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search_by_entry (GstPluginFeature * feature, gpointer search_entry)
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{
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gchar **protocols;
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GstElementFactory *factory;
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SearchEntry *entry = (SearchEntry *) search_entry;
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if (!GST_IS_ELEMENT_FACTORY (feature))
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return FALSE;
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factory = GST_ELEMENT_FACTORY (feature);
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if (gst_element_factory_get_uri_type (factory) != entry->type)
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return FALSE;
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protocols = gst_element_factory_get_uri_protocols (factory);
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/* must be set when uri type is valid */
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g_assert (protocols);
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while (*protocols != NULL) {
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if (strcmp (*protocols, entry->protocol) == 0)
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return TRUE;
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protocols++;
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}
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return FALSE;
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}
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static gint
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sort_by_rank (gconstpointer a, gconstpointer b)
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{
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GstPluginFeature *first = GST_PLUGIN_FEATURE (a);
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GstPluginFeature *second = GST_PLUGIN_FEATURE (b);
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return gst_plugin_feature_get_rank (second) -
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gst_plugin_feature_get_rank (first);
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}
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/**
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* gst_element_make_from_uri:
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* @type: wether to create a source or a sink
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* @uri: URI to create element for
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* @elementname: optional name of created element
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*
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* Creates an element for handling the given URI.
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*
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* Returns: a new element or NULL if none could be created
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*/
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GstElement *
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gst_element_make_from_uri (const GstURIType type, const gchar * uri,
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const gchar * elementname)
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{
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GList *possibilities, *walk;
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SearchEntry entry;
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GstElement *ret = NULL;
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g_return_val_if_fail (GST_URI_TYPE_IS_VALID (type), NULL);
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g_return_val_if_fail (gst_uri_is_valid (uri), NULL);
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entry.type = type;
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entry.protocol = gst_uri_get_protocol (uri);
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possibilities =
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gst_registry_pool_feature_filter (search_by_entry, FALSE, &entry);
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g_free (entry.protocol);
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if (!possibilities) {
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GST_DEBUG ("No %s for URI '%s'", type == GST_URI_SINK ? "sink" : "source",
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uri);
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return NULL;
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}
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possibilities = g_list_sort (possibilities, sort_by_rank);
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walk = possibilities;
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while (walk) {
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if ((ret = gst_element_factory_create (GST_ELEMENT_FACTORY (walk->data),
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elementname)) != NULL) {
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GstURIHandler *handler = GST_URI_HANDLER (ret);
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if (gst_uri_handler_set_uri (handler, uri))
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break;
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gst_object_unref (GST_OBJECT (ret));
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ret = NULL;
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}
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}
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g_list_free (possibilities);
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GST_LOG_OBJECT (ret, "created %s for URL '%s'",
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type == GST_URI_SINK ? "sink" : "source", uri);
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return ret;
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}
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/**
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* gst_uri_handler_get_uri_type:
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* @handler: Handler to query type of
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*
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* Gets the type of a URI handler
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*
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* Returns: the type of the URI handler
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*/
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guint
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gst_uri_handler_get_uri_type (GstURIHandler * handler)
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{
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GstURIHandlerInterface *iface;
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guint ret;
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g_return_val_if_fail (GST_IS_URI_HANDLER (handler), GST_URI_UNKNOWN);
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iface = GST_URI_HANDLER_GET_INTERFACE (handler);
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g_return_val_if_fail (iface != NULL, GST_URI_UNKNOWN);
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g_return_val_if_fail (iface->get_type != NULL, GST_URI_UNKNOWN);
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ret = iface->get_type ();
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g_return_val_if_fail (GST_URI_TYPE_IS_VALID (ret), GST_URI_UNKNOWN);
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return ret;
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}
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/**
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* gst_uri_handler_get_protocols:
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* @handler: Handler to get protocols for
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*
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* Gets the list of supported protocols for this handler. This list may not be
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* modified.
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*
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* Returns: the supported protocols
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*/
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gchar **
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gst_uri_handler_get_protocols (GstURIHandler * handler)
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{
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GstURIHandlerInterface *iface;
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gchar **ret;
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g_return_val_if_fail (GST_IS_URI_HANDLER (handler), NULL);
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iface = GST_URI_HANDLER_GET_INTERFACE (handler);
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g_return_val_if_fail (iface != NULL, NULL);
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g_return_val_if_fail (iface->get_protocols != NULL, NULL);
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ret = iface->get_protocols ();
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g_return_val_if_fail (ret != NULL, NULL);
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return ret;
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}
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/**
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* gst_uri_handler_get_uri:
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* @handler: handler to query URI of
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*
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* Gets the currently handled URI of the handler or NULL, if none is set.
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*
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* Returns: the URI
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*/
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G_CONST_RETURN gchar *
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gst_uri_handler_get_uri (GstURIHandler * handler)
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{
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GstURIHandlerInterface *iface;
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const gchar *ret;
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g_return_val_if_fail (GST_IS_URI_HANDLER (handler), NULL);
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iface = GST_URI_HANDLER_GET_INTERFACE (handler);
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g_return_val_if_fail (iface != NULL, NULL);
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g_return_val_if_fail (iface->get_uri != NULL, NULL);
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ret = iface->get_uri (handler);
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if (ret != NULL)
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g_return_val_if_fail (gst_uri_is_valid (ret), NULL);
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return ret;
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}
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/**
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* gst_uri_handler_set_uri:
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* @handler: handler to set URI of
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* @uri: URI to set
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*
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* Tries to set the URI of the given handler and returns TRUE if it succeeded.
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*
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* Returns: TRUE, if the URI was set successfully
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*/
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gboolean
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gst_uri_handler_set_uri (GstURIHandler * handler, const gchar * uri)
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{
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GstURIHandlerInterface *iface;
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g_return_val_if_fail (GST_IS_URI_HANDLER (handler), FALSE);
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g_return_val_if_fail (gst_uri_is_valid (uri), FALSE);
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iface = GST_URI_HANDLER_GET_INTERFACE (handler);
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g_return_val_if_fail (iface != NULL, FALSE);
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g_return_val_if_fail (iface->set_uri != NULL, FALSE);
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return iface->set_uri (handler, uri);
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}
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/**
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* gst_uri_handler_new_uri:
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* @handler: handler with a new URI
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* @uri: new URI or NULL if it was unset
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*
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* Emits the new-uri event for a given handler, when that handler has a new URI.
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* This function should only be called by URI handlers themselves.
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*/
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void
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gst_uri_handler_new_uri (GstURIHandler * handler, const gchar * uri)
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{
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g_return_if_fail (GST_IS_URI_HANDLER (handler));
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g_signal_emit_by_name (handler, "new-uri", uri);
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}
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