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cd429e460c
Original commit message from CVS: Change G_TYPE_POINTER to the appropriate type in g_signal_new()
417 lines
10 KiB
C
417 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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* gstxml.c: XML save/restore of pipelines
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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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#include "gst_private.h"
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#include "gstxml.h"
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#include "gstinfo.h"
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#include "gstbin.h"
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enum {
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OBJECT_LOADED,
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LAST_SIGNAL
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};
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static void gst_xml_class_init (GstXMLClass *klass);
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static void gst_xml_init (GstXML *xml);
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static void gst_xml_object_loaded (GstObject *private, GstObject *object, xmlNodePtr self, gpointer data);
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static GstObjectClass *parent_class = NULL;
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static guint gst_xml_signals[LAST_SIGNAL] = { 0 };
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GType
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gst_xml_get_type(void)
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{
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static GType xml_type = 0;
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if (!xml_type) {
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static const GTypeInfo xml_info = {
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sizeof(GstXMLClass),
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NULL,
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NULL,
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(GClassInitFunc)gst_xml_class_init,
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NULL,
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NULL,
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sizeof(GstXML),
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0,
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(GInstanceInitFunc)gst_xml_init,
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NULL
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};
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xml_type = g_type_register_static (GST_TYPE_OBJECT, "GstXML", &xml_info, 0);
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}
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return xml_type;
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}
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static void
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gst_xml_class_init (GstXMLClass *klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass *)klass;
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parent_class = g_type_class_ref (GST_TYPE_OBJECT);
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/* FIXME G_TYPE_POINTER should be GType of xmlNodePtr */
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gst_xml_signals[OBJECT_LOADED] =
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g_signal_new ("object_loaded", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstXMLClass, object_loaded), NULL, NULL,
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gst_marshal_VOID__OBJECT_POINTER, G_TYPE_NONE, 2,
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GST_TYPE_OBJECT, G_TYPE_POINTER);
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}
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static void
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gst_xml_init(GstXML *xml)
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{
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xml->topelements = NULL;
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}
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/**
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* gst_xml_new:
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*
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* Create a new GstXML parser object.
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*
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* Returns: a pointer to a new GstXML object.
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*/
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GstXML*
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gst_xml_new (void)
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{
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return GST_XML (g_object_new(GST_TYPE_XML,NULL));
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}
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/**
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* gst_xml_write:
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* @element: The element to write out
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*
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* Converts the given element into an XML presentation.
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*
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* Returns: a pointer to an XML document
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*/
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xmlDocPtr
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gst_xml_write (GstElement *element)
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{
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xmlDocPtr doc;
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xmlNodePtr elementnode;
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xmlNsPtr gst_ns;
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doc = xmlNewDoc ("1.0");
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doc->xmlRootNode = xmlNewDocNode (doc, NULL, "gstreamer", NULL);
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gst_ns = xmlNewNs (doc->xmlRootNode, "http://gstreamer.net/gst-core/1.0/", "gst");
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elementnode = xmlNewChild (doc->xmlRootNode, gst_ns, "element", NULL);
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gst_object_save_thyself (GST_OBJECT (element), elementnode);
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return doc;
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}
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/**
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* gst_xml_write_file:
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* @element: The element to write out
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* @out: an open file, like stdout
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*
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* Converts the given element into XML and writes the formatted XML to an open
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* file.
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*
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* Returns: number of bytes written on success, -1 otherwise.
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*/
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gint
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gst_xml_write_file (GstElement *element, FILE *out)
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{
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xmlDocPtr cur;
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#ifdef HAVE_LIBXML2
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xmlOutputBufferPtr buf;
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#endif
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const char * encoding;
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xmlCharEncodingHandlerPtr handler = NULL;
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int indent;
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gboolean ret;
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cur = gst_xml_write (element);
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if (!cur) return -1;
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#ifdef HAVE_LIBXML2
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encoding = (const char *) cur->encoding;
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if (encoding != NULL) {
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xmlCharEncoding enc;
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enc = xmlParseCharEncoding (encoding);
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if (cur->charset != XML_CHAR_ENCODING_UTF8) {
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xmlGenericError (xmlGenericErrorContext,
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"xmlDocDump: document not in UTF8\n");
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return -1;
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}
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if (enc != XML_CHAR_ENCODING_UTF8) {
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handler = xmlFindCharEncodingHandler (encoding);
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if (handler == NULL) {
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xmlFree ((char *) cur->encoding);
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cur->encoding = NULL;
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}
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}
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}
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buf = xmlOutputBufferCreateFile (out, handler);
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indent = xmlIndentTreeOutput;
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xmlIndentTreeOutput = 1;
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ret = xmlSaveFormatFileTo(buf, cur, NULL, 1);
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xmlIndentTreeOutput = indent;
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#else
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/* apparently this doesn't return anything in libxml1 */
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xmlDocDump (out, cur);
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ret = 1;
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#endif
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return ret;
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}
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/**
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* gst_xml_parse_doc:
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* @xml: a pointer to a GstXML object
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* @doc: a pointer to an xml document to parse
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* @root: The name of the root object to build
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*
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* Fills the GstXML object with the elements from the
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* xmlDocPtr.
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*
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* Returns: TRUE on success, FALSE otherwise
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*/
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gboolean
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gst_xml_parse_doc (GstXML *xml, xmlDocPtr doc, const guchar *root)
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{
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xmlNodePtr field, cur;
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xmlNsPtr ns;
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cur = xmlDocGetRootElement(doc);
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if (cur == NULL) {
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g_warning("gstxml: empty document\n");
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return FALSE ;
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}
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ns = xmlSearchNsByHref(doc, cur, "http://gstreamer.net/gst-core/1.0/");
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if (ns == NULL) {
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g_warning("gstxml: document of wrong type, core namespace not found\n");
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return FALSE;
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}
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if (strcmp(cur->name, "gstreamer")) {
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g_warning("gstxml: XML file is in wrong format\n");
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return FALSE;
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}
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gst_class_signal_connect (GST_OBJECT_CLASS (G_OBJECT_GET_CLASS(xml)),
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"object_loaded", gst_xml_object_loaded, xml);
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xml->ns = ns;
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field = cur->xmlChildrenNode;
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while (field) {
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if (!strcmp(field->name, "element") && (field->ns == xml->ns)) {
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GstElement *element;
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element = gst_xml_make_element (field, NULL);
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xml->topelements = g_list_prepend (xml->topelements, element);
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}
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field = field->next;
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}
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xml->topelements = g_list_reverse (xml->topelements);
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return TRUE;
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}
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/**
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* gst_xml_parse_file:
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* @xml: a pointer to a GstXML object
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* @fname: The filename with the xml description
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* @root: The name of the root object to build
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*
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* Fills the GstXML object with the corresponding elements from
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* the XML file fname. Optionally it will only build the element from
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* the element node root (if it is not NULL). This feature is useful
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* if you only want to build a specific element from an XML file
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* but not the pipeline it is embedded in.
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*
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* Pass "-" as fname to read from stdin. You can also pass a URI
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* of any format that libxml supports, including http.
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*
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* Returns: TRUE on success, FALSE otherwise
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*/
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gboolean
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gst_xml_parse_file (GstXML *xml, const guchar *fname, const guchar *root)
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{
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xmlDocPtr doc;
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g_return_val_if_fail(fname != NULL, FALSE);
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doc = xmlParseFile(fname);
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if (!doc) {
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g_warning("gstxml: XML file \"%s\" could not be read\n", fname);
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return FALSE;
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}
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return gst_xml_parse_doc (xml, doc, root);
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}
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/**
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* gst_xml_parse_memory:
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* @xml: a pointer to a GstXML object
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* @buffer: a pointer to the in memory XML buffer
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* @size: the size of the buffer
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* @root: the name of the root objects to build
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*
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* Fills the GstXML object with the corresponding elements from
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* an in memory XML buffer.
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*
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* Returns: TRUE on success
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*/
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gboolean
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gst_xml_parse_memory (GstXML *xml, guchar *buffer, guint size, const gchar *root)
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{
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xmlDocPtr doc;
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g_return_val_if_fail(buffer != NULL, FALSE);
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doc = xmlParseMemory (buffer, size);
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return gst_xml_parse_doc (xml, doc, root);
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}
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static void
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gst_xml_object_loaded (GstObject *private, GstObject *object, xmlNodePtr self, gpointer data)
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{
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GstXML *xml = GST_XML (data);
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/* FIXME check that this element was created from the same xmlDocPtr...*/
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g_signal_emit (G_OBJECT (xml), gst_xml_signals[OBJECT_LOADED], 0, object, self);
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}
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/**
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* gst_xml_get_topelements:
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* @xml: The GstXML to get the elements from
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*
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* Retrive a list of toplevel elements.
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*
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* Returns: a GList of elements
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*/
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GList*
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gst_xml_get_topelements (GstXML *xml)
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{
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g_return_val_if_fail (xml != NULL, NULL);
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return xml->topelements;
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}
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/**
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* gst_xml_get_element:
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* @xml: The GstXML to get the element from
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* @name: The name of element to retreive
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*
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* This function is used to get a pointer to the GstElement corresponding
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* to name in the pipeline description. You would use this if you have
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* to do anything to the element after loading.
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*
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* Returns: a pointer to a new GstElement
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*/
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GstElement*
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gst_xml_get_element (GstXML *xml, const guchar *name)
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{
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GstElement *element;
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GList *topelements;
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g_return_val_if_fail(xml != NULL, NULL);
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g_return_val_if_fail(name != NULL, NULL);
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GST_DEBUG ("gstxml: getting element \"%s\"", name);
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topelements = gst_xml_get_topelements (xml);
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while (topelements) {
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GstElement *top = GST_ELEMENT (topelements->data);
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GST_DEBUG ("gstxml: getting element \"%s\"", name);
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if (!strcmp (GST_ELEMENT_NAME (top), name)) {
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return top;
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}
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else {
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if (GST_IS_BIN (top)) {
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element = gst_bin_get_by_name (GST_BIN (top), name);
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if (element)
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return element;
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}
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}
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topelements = g_list_next (topelements);
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}
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return NULL;
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}
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/**
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* gst_xml_make_element:
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* @cur: the xml node
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* @parent: the parent of this object when it's loaded
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*
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* Load the element from the XML description
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*
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* Returns: the new element
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*/
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GstElement*
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gst_xml_make_element (xmlNodePtr cur, GstObject *parent)
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{
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xmlNodePtr children = cur->xmlChildrenNode;
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GstElement *element;
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guchar *name = NULL;
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guchar *type = NULL;
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/* first get the needed tags to construct the element */
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while (children) {
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if (!strcmp (children->name, "name")) {
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name = xmlNodeGetContent (children);
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} else if (!strcmp (children->name, "type")) {
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type = xmlNodeGetContent (children);
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}
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children = children->next;
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}
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g_return_val_if_fail (name != NULL, NULL);
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g_return_val_if_fail (type != NULL, NULL);
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GST_CAT_INFO (GST_CAT_XML,"loading \"%s\" of type \"%s\"", name, type);
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element = gst_element_factory_make (type, name);
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g_return_val_if_fail (element != NULL, NULL);
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/* ne need to set the parent on this object bacause the pads */
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/* will go through the hierarchy to link to their peers */
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if (parent)
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gst_object_set_parent (GST_OBJECT (element), parent);
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gst_object_restore_thyself (GST_OBJECT (element), cur);
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return element;
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}
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