Hi Edward, <br><br>Thanks for your reply. <br>Yes, it's essential to check the return values, but this is just a sample code by which I wanted to demonstrate what I'm trying to do. <br>What I'm keen to know are <br> 1. is there any api which will directly give me the parent element details (something like gst_get_factory_name())<br>2. Is it possible to extract the element information by any other means?<br><br>Thanks again,<br>Gireesh<br> <br><div class="gmail_quote">On Thu, Nov 6, 2008 at 7:54 PM, Edward Hervey <span dir="ltr"><<a href="mailto:edward.hervey@collabora.co.uk">edward.hervey@collabora.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="Ih2E3d">On Thu, 2008-11-06 at 18:46 +0530, Gireesh Kumar M wrote:<br> > Hi All,<br> ><br> > Is there any way to extract the parent element information from a<br> > gstreamer element?<br> > I tried it using the following code snippets but none of them worked.<br> ><br> ><br> > GstElement *elem =<br> > GST_ELEMENT_CAST(gst_element_get_parent(GST_ELEMENT(pad)));<br> <br> </div>  Yay, casting a GstPad to a GstElement (!?!?!?).<br>  Yay, not checking for the return value of gst_element_get_parent().<br> <div class="Ih2E3d"><br> > g_print("In element %s\n", gst_element_get_name(elem)); //-------this<br> > displays current element name properly<br> ><br> > elem = GST_ELEMENT_CAST(gst_element_get_parent(elem));<br> <br> </div>  Yay, not checking for the return value of gst_element_get_parent().<br> <div class="Ih2E3d"><br> > g_print("Parent element is %s\n",<br> > gst_element_get_name(elem)); //---this displays pipeline0<br> ><br> ><br> > elem = GST_ELEMENT_CAST(gst_element_get_parent(elem));  //--this<br> <br> </div>  Yay, not checking for the return value of gst_element_get_parent().<br> <div class="Ih2E3d"><br> >  throws the following error<br> > g_print("Grand Parent element is %s\n", gst_element_get_name(elem));<br> ><br> > /*(gst-launch-0.10:488): GStreamer-CRITICAL **: gst_object_get_name:<br> > assertion `GS<br> > T_IS_OBJECT (object)' failed<br> > Caught SIGSEGV accessing address (nil)<br> > Spinning.  Please run 'gdb gst-launch 488' to continue debugging,<br> > Ctrl-C to quit<br> > , or Ctrl-\ to dump core. */<br> ><br> ><br> > Then I tried,<br> ><br> > GstElement *elem =<br> > GST_ELEMENT_CAST(gst_element_get_parent(GST_ELEMENT(pad)));<br> <br> </div>  Yay, not checking for the return value of gst_element_get_parent().<br>  YAY, casting a GstPad to a GstElement (!?!?!?!)<br> <br> > elem = GST_ELEMENT_CAST(gst_element_get_parent(elem));<br> ><br>  Yay, not checking for the return value of gst_element_get_parent().<br> <div class="Ih2E3d"><br> > GstElementClass *kl = GST_ELEMENT_GET_CLASS(elem);<br> <br> </div>  Yay, not checking for the return value of GST_ELEMENT_GET_CLASS().<br> <div class="Ih2E3d"><br> > g_print("In element %s\n",<br> > gst_object_get_name((GstObject*)(kl.details->longname));<br> ><br> > This again gave pipeline0, where I'm expecting the actual name of the<br> > element. It would be great if anyone can guide me.<br> <br> </div>  So, to summarize: You're asking for the parent of the parent of the<br> pad.<br>  The parent of the pad : The element to which the pad (maybe) belongs.<br>  The parent of the element to which the pad belongs : a pipeline.<br> <br>  There's nothing wrong in what it's returning, but please... if you<br> haven't noticed by now... always check the return values of<br> functions/methods. It'll avoid you from calling methods/functions with<br> invalid arguments.<br> <font color="#888888"><br>    Edward<br> </font><div class="Ih2E3d"><br> ><br> > Many thanks in advance,<br> > Gireesh<br> </div><div><div></div><div class="Wj3C7c">> -------------------------------------------------------------------------<br> > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge<br> > Build the coolest Linux based applications with Moblin SDK & win great prizes<br> > Grand prize is a trip for two to an Open Source event anywhere in the world<br> > <a href="http://moblin-contest.org/redirect.php?banner_id=100&url=/" target="_blank">http://moblin-contest.org/redirect.php?banner_id=100&url=/</a><br> > _______________________________________________ Gstreamer-embedded mailing list <a href="mailto:Gstreamer-embedded@lists.sourceforge.net">Gstreamer-embedded@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-embedded" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-embedded</a><br> <br> </div></div></blockquote></div><br>