author | hgs |
Fri, 30 Apr 2010 19:11:56 -0500 | |
changeset 19 | 24ed0baaf8e5 |
parent 16 | 8e837d1bf446 |
child 30 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* 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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|
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/** |
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* SECTION:gstxml |
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* @short_description: XML save/restore operations of pipelines |
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* |
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* GStreamer pipelines can be saved to xml files using gst_xml_write_file(). |
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* They can be loaded back using gst_xml_parse_doc() / gst_xml_parse_file() / |
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* gst_xml_parse_memory(). |
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* Additionally one can load saved pipelines into the gst-editor to inspect the |
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* graph. |
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* |
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* #GstElement implementations need to override the save_thyself() and |
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* restore_thyself() virtual functions of #GstObject. |
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*/ |
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#include "gst_private.h" |
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#include "gstxml.h" |
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#include "gstmarshal.h" |
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#include "gstinfo.h" |
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#include "gstbin.h" |
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enum |
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{ |
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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_dispose (GObject * object); |
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static void gst_xml_object_loaded (GstObject * private, GstObject * object, |
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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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G_DEFINE_TYPE (GstXML, gst_xml, GST_TYPE_OBJECT); |
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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 = (GObjectClass *) klass; |
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parent_class = g_type_class_peek_parent (klass); |
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gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_xml_dispose); |
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/* FIXME G_TYPE_POINTER should be GType of xmlNodePtr |
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* (ensonic) can't be fixed, as libxml does not use GObject (unfortunately) |
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*/ |
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/** |
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* GstXML::object-loaded: |
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* @xml: the xml persistence instance |
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* @object: the object that has been loaded |
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* @xml_node: the related xml_node pointer to the document tree |
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* |
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* Signals that a new object has been deserialized. |
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*/ |
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gst_xml_signals[OBJECT_LOADED] = |
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g_signal_new ("object-loaded", G_TYPE_FROM_CLASS (klass), |
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstXMLClass, object_loaded), NULL, |
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NULL, gst_marshal_VOID__OBJECT_POINTER, G_TYPE_NONE, 2, GST_TYPE_OBJECT, |
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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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static void |
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gst_xml_dispose (GObject * object) |
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{ |
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GstXML *xml = GST_XML (object); |
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g_list_foreach (xml->topelements, (GFunc) gst_object_unref, NULL); |
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g_list_free (xml->topelements); |
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xml->topelements = NULL; |
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G_OBJECT_CLASS (parent_class)->dispose (object); |
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} |
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107 |
|
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108 |
/** |
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* gst_xml_new: |
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110 |
* |
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* Create a new GstXML parser object. |
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112 |
* |
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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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117 |
{ |
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return GST_XML (g_object_new (GST_TYPE_XML, NULL)); |
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} |
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120 |
|
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121 |
/** |
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122 |
* gst_xml_write: |
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* @element: The element to write out |
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124 |
* |
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* Converts the given element into an XML presentation. |
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126 |
* |
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* Returns: a pointer to an XML document |
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*/ |
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129 |
xmlDocPtr |
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gst_xml_write (GstElement * element) |
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131 |
{ |
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xmlDocPtr doc; |
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xmlNodePtr elementnode; |
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xmlNsPtr gst_ns; |
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135 |
|
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doc = xmlNewDoc ((xmlChar *) "1.0"); |
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137 |
|
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doc->xmlRootNode = xmlNewDocNode (doc, NULL, (xmlChar *) "gstreamer", NULL); |
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139 |
|
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140 |
gst_ns = |
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xmlNewNs (doc->xmlRootNode, |
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(xmlChar *) "http://gstreamer.net/gst-core/1.0/", (xmlChar *) "gst"); |
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143 |
|
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144 |
elementnode = xmlNewChild (doc->xmlRootNode, gst_ns, (xmlChar *) "element", |
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145 |
NULL); |
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146 |
|
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gst_object_save_thyself (GST_OBJECT (element), elementnode); |
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148 |
|
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149 |
return doc; |
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150 |
} |
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|
151 |
|
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152 |
/** |
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153 |
* gst_xml_write_file: |
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154 |
* @element: The element to write out |
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* @out: an open file, like stdout |
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156 |
* |
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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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159 |
* |
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* Returns: number of bytes written on success, -1 otherwise. |
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161 |
*/ |
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162 |
gint |
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gst_xml_write_file (GstElement * element, FILE * out) |
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164 |
{ |
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xmlDocPtr cur; |
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166 |
|
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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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|
174 |
|
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cur = gst_xml_write (element); |
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if (!cur) |
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return -1; |
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178 |
|
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179 |
#ifdef HAVE_LIBXML2 |
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encoding = (const char *) cur->encoding; |
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181 |
|
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if (encoding != NULL) { |
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xmlCharEncoding enc; |
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184 |
|
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enc = xmlParseCharEncoding (encoding); |
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186 |
|
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if (cur->charset != XML_CHAR_ENCODING_UTF8) { |
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188 |
xmlGenericError (xmlGenericErrorContext, |
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"xmlDocDump: document not in UTF8\n"); |
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return -1; |
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191 |
} |
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192 |
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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197 |
} |
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198 |
} |
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199 |
} |
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|
200 |
|
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201 |
buf = xmlOutputBufferCreateFile (out, handler); |
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202 |
|
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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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208 |
/* 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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211 |
#endif |
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212 |
|
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return ret; |
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} |
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215 |
|
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216 |
/** |
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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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227 |
gboolean |
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gst_xml_parse_doc (GstXML * xml, xmlDocPtr doc, const guchar * root) |
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229 |
{ |
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xmlNodePtr field, cur; |
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xmlNsPtr ns; |
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232 |
|
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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, |
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(xmlChar *) "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 ((char *) 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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248 |
|
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gst_class_signal_connect (GST_OBJECT_CLASS (G_OBJECT_GET_CLASS (xml)), |
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"object_loaded", (gpointer) gst_xml_object_loaded, xml); |
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251 |
|
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xml->ns = ns; |
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253 |
|
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field = cur->xmlChildrenNode; |
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255 |
|
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while (field) { |
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if (!strcmp ((char *) field->name, "element") && (field->ns == xml->ns)) { |
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GstElement *element; |
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259 |
|
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element = gst_xml_make_element (field, NULL); |
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261 |
|
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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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266 |
|
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xml->topelements = g_list_reverse (xml->topelements); |
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|
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return TRUE; |
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} |
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271 |
|
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/* FIXME 0.9: Why guchar*? */ |
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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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287 |
* |
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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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292 |
{ |
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xmlDocPtr doc; |
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gboolean ret; |
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295 |
|
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g_return_val_if_fail (fname != NULL, FALSE); |
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|
297 |
|
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doc = xmlParseFile ((char *) fname); |
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|
299 |
|
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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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303 |
} |
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|
304 |
|
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ret = gst_xml_parse_doc (xml, doc, root); |
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|
306 |
|
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xmlFreeDoc (doc); |
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308 |
return ret; |
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309 |
} |
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|
310 |
|
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311 |
/* FIXME 0.9: guchar* */ |
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312 |
/** |
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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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317 |
* @root: the name of the root objects to build |
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318 |
* |
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319 |
* Fills the GstXML object with the corresponding elements from |
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320 |
* an in memory XML buffer. |
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321 |
* |
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322 |
* Returns: TRUE on success |
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323 |
*/ |
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324 |
gboolean |
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325 |
gst_xml_parse_memory (GstXML * xml, guchar * buffer, guint size, |
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|
326 |
const gchar * root) |
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327 |
{ |
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328 |
xmlDocPtr doc; |
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329 |
gboolean ret; |
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330 |
|
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331 |
g_return_val_if_fail (buffer != NULL, FALSE); |
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|
332 |
|
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333 |
doc = xmlParseMemory ((char *) buffer, size); |
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|
334 |
|
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335 |
ret = gst_xml_parse_doc (xml, doc, (const xmlChar *) root); |
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336 |
|
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337 |
xmlFreeDoc (doc); |
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338 |
return ret; |
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339 |
} |
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340 |
|
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341 |
static void |
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342 |
gst_xml_object_loaded (GstObject * private, GstObject * object, xmlNodePtr self, |
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343 |
gpointer data) |
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344 |
{ |
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345 |
GstXML *xml = GST_XML (data); |
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346 |
|
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347 |
/* FIXME check that this element was created from the same xmlDocPtr... */ |
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348 |
g_signal_emit (G_OBJECT (xml), gst_xml_signals[OBJECT_LOADED], 0, object, |
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349 |
self); |
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350 |
} |
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|
351 |
|
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352 |
/** |
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353 |
* gst_xml_get_topelements: |
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354 |
* @xml: The GstXML to get the elements from |
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355 |
* |
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356 |
* Retrieve a list of toplevel elements. |
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357 |
* |
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358 |
* Returns: a GList of top-level elements. The caller does not own a copy |
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359 |
* of the list and must not free or modify the list. The caller also does not |
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360 |
* own a reference to any of the elements in the list and should obtain its own |
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361 |
* reference using gst_object_ref() if necessary. |
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362 |
*/ |
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363 |
GList * |
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364 |
gst_xml_get_topelements (GstXML * xml) |
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365 |
{ |
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366 |
g_return_val_if_fail (xml != NULL, NULL); |
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367 |
|
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368 |
return xml->topelements; |
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369 |
} |
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|
370 |
|
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371 |
/* FIXME 0.11: why is the arg guchar* instead of gchar*? */ |
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372 |
/** |
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373 |
* gst_xml_get_element: |
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374 |
* @xml: The GstXML to get the element from |
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375 |
* @name: The name of element to retrieve |
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376 |
* |
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377 |
* This function is used to get a pointer to the GstElement corresponding |
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378 |
* to name in the pipeline description. You would use this if you have |
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379 |
* to do anything to the element after loading. |
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380 |
* |
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381 |
* Returns: a pointer to a new GstElement, caller owns returned reference. |
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382 |
*/ |
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383 |
GstElement * |
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|
384 |
gst_xml_get_element (GstXML * xml, const guchar * name) |
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|
385 |
{ |
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|
386 |
GstElement *element; |
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|
387 |
GList *topelements; |
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|
388 |
|
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|
389 |
g_return_val_if_fail (xml != NULL, NULL); |
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|
390 |
g_return_val_if_fail (name != NULL, NULL); |
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|
391 |
|
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|
392 |
GST_DEBUG ("gstxml: getting element \"%s\"", name); |
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|
393 |
|
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|
394 |
topelements = gst_xml_get_topelements (xml); |
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|
395 |
|
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|
396 |
while (topelements) { |
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|
397 |
GstElement *top = GST_ELEMENT (topelements->data); |
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|
398 |
|
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|
399 |
GST_DEBUG ("gstxml: getting element \"%s\"", name); |
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|
400 |
if (!strcmp (GST_ELEMENT_NAME (top), (char *) name)) { |
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|
401 |
return GST_ELEMENT_CAST (gst_object_ref (top)); |
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|
402 |
} else { |
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|
403 |
if (GST_IS_BIN (top)) { |
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|
404 |
element = gst_bin_get_by_name (GST_BIN (top), (gchar *) name); |
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|
405 |
|
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|
406 |
if (element) |
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|
407 |
return element; |
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|
408 |
} |
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|
409 |
} |
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|
410 |
topelements = g_list_next (topelements); |
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|
411 |
} |
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|
412 |
return NULL; |
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|
413 |
} |
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|
414 |
|
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|
415 |
/** |
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|
416 |
* gst_xml_make_element: |
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|
417 |
* @cur: the xml node |
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|
418 |
* @parent: the parent of this object when it's loaded |
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|
419 |
* |
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|
420 |
* Load the element from the XML description |
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|
421 |
* |
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|
422 |
* Returns: the new element |
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|
423 |
*/ |
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424 |
GstElement * |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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425 |
gst_xml_make_element (xmlNodePtr cur, GstObject * parent) |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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426 |
{ |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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|
427 |
xmlNodePtr children = cur->xmlChildrenNode; |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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changeset
|
428 |
GstElement *element; |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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|
429 |
gchar *name = NULL; |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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430 |
gchar *type = NULL; |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
431 |
|
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
432 |
/* first get the needed tags to construct the element */ |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
433 |
while (children) { |
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parents:
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|
434 |
if (!strcmp ((char *) children->name, "name")) { |
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parents:
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|
435 |
name = (gchar *) xmlNodeGetContent (children); |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
436 |
} else if (!strcmp ((char *) children->name, "type")) { |
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parents:
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|
437 |
type = (gchar *) xmlNodeGetContent (children); |
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parents:
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changeset
|
438 |
} |
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Revision: 200949
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parents:
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|
439 |
children = children->next; |
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Revision: 200949
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parents:
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|
440 |
} |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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|
441 |
g_return_val_if_fail (name != NULL, NULL); |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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changeset
|
442 |
g_return_val_if_fail (type != NULL, NULL); |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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changeset
|
443 |
|
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Revision: 200949
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|
444 |
GST_CAT_INFO (GST_CAT_XML, "loading \"%s\" of type \"%s\"", name, type); |
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|
445 |
|
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Revision: 200949
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|
446 |
element = gst_element_factory_make (type, name); |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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changeset
|
447 |
|
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Revision: 200949
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parents:
diff
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|
448 |
g_return_val_if_fail (element != NULL, NULL); |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
449 |
|
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Revision: 200949
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|
450 |
g_free (type); |
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|
451 |
g_free (name); |
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parents:
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|
452 |
|
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Revision: 200949
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|
453 |
/* ne need to set the parent on this object bacause the pads */ |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
454 |
/* will go through the hierarchy to link to their peers */ |
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Revision: 200949
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|
455 |
if (parent) { |
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Revision: 200949
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|
456 |
if (GST_IS_BIN (parent)) { |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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|
457 |
gst_bin_add (GST_BIN (parent), element); |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
458 |
} else { |
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Revision: 200949
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parents:
diff
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|
459 |
gst_object_set_parent (GST_OBJECT (element), parent); |
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Revision: 200949
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parents:
diff
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|
460 |
} |
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Revision: 200949
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parents:
diff
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|
461 |
} |
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Revision: 200949
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parents:
diff
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|
462 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
463 |
gst_object_restore_thyself (GST_OBJECT (element), cur); |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
464 |
|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
465 |
return element; |
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Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
466 |
} |