Hi Edward, >Those are two things: > * Getting the parent element (of what ? a pad ? another element ?) => >use the appropriate gst_*_get_parent(). Yes. I tried it in the same way. gst_element_get_parent() gave me "pipeline0" and not the parent element name. Is it because I'm casting it? Now, two questions... 1. it there a way to get the GstElement object corresponds to a particular GstPad object? A macro or something? I was expecting GST_ELEMENT to do the casting. I'm referring to <pre>element = GST_ELEMENT (GST_OBJECT_PARENT (rpad)); </pre>from line no 678, <a href="http://www.google.com/codesearch?hl=en&q=GST_ELEMENT+show:7kqxMMVD25A:h1NDCsbGCXw:9xQ-bHfcgJ4&sa=N&cd=5&ct=rc&cs_p=http://gstreamer.freedesktop.org/src/gst-editor/gst-editor-0.7.0.tar.bz2&cs_f=gst-editor-0.7.0/libs/gst/editor/gsteditorpad.c">http://www.google.com/codesearch?hl=en&q=GST_ELEMENT+show:7kqxMMVD25A:h1NDCsbGCXw:9xQ-bHfcgJ4&sa=N&cd=5&ct=rc&cs_p=http://gstreamer.freedesktop.org/src/gst-editor/gst-editor-0.7.0.tar.bz2&cs_f=gst-editor-0.7.0/libs/gst/editor/gsteditorpad.c</a> 2. Is there any api to query the running pipeline? Some string that contains the pipeline name, at least?   >* Getting the GstElementFactory details of an instance. => >gst_element_get_factory() => gst_element_factory_get_*(). You are talking about gst_element_factory_get_longname(), right? This needs the return value of gst_element_factory_find("element name") to be passed, where the element name is unknown at compile time. What I intend to do is something like this. gst-launch-0.10 filesrc location=file.avi ! ffdemux_avi ! queue ! <my decoder plugin> ! alsasink Is it possible to extract the demuxer name (run time) from my decoder element? Thanks a lot, Gireesh <div class="gmail_quote">On Thu, Nov 6, 2008 at 9:44 PM, Edward Hervey <<a href="mailto:edward.hervey@collabora.co.uk" target="_blank">edward.hervey@collabora.co.uk</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div>On Thu, 2008-11-06 at 21:33 +0530, Gireesh Kumar M wrote: > Hi Edward, > > Thanks for your reply. > 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. </div>  Fair enough, in that case don't mention the segfaults. <div> > What I'm keen to know are > 1. is there any api which will directly give me the parent element > details (something like gst_get_factory_name()) </div>  Those are two things:  * Getting the parent element (of what ? a pad ? another element ?) => use the appropriate gst_*_get_parent().  * Getting the GstElementFactory details of an instance. => gst_element_get_factory() => gst_element_factory_get_*(). <div><div></div><div> > 2. Is it possible to extract the element information by any other > means? > > Thanks again, > Gireesh > > On Thu, Nov 6, 2008 at 7:54 PM, Edward Hervey > <<a href="mailto:edward.hervey@collabora.co.uk" target="_blank">edward.hervey@collabora.co.uk</a>> wrote: >         On Thu, 2008-11-06 at 18:46 +0530, Gireesh Kumar M wrote: >         > Hi All, >         > >         > Is there any way to extract the parent element information >         from a >         > gstreamer element? >         > I tried it using the following code snippets but none of >         them worked. >         > >         > >         > GstElement *elem = >         > GST_ELEMENT_CAST(gst_element_get_parent(GST_ELEMENT(pad))); > > >          Yay, casting a GstPad to a GstElement (!?!?!?). >          Yay, not checking for the return value of >         gst_element_get_parent(). > >         > g_print("In element %s\n", >         gst_element_get_name(elem)); //-------this >         > displays current element name properly >         > >         > elem = GST_ELEMENT_CAST(gst_element_get_parent(elem)); > > >          Yay, not checking for the return value of >         gst_element_get_parent(). > >         > g_print("Parent element is %s\n", >         > gst_element_get_name(elem)); //---this displays pipeline0 >         > >         > >         > elem = GST_ELEMENT_CAST(gst_element_get_parent(elem)); >          //--this > > >          Yay, not checking for the return value of >         gst_element_get_parent(). > >         >  throws the following error >         > g_print("Grand Parent element is %s\n", >         gst_element_get_name(elem)); >         > >         > /*(gst-launch-0.10:488): GStreamer-CRITICAL **: >         gst_object_get_name: >         > assertion `GS >         > T_IS_OBJECT (object)' failed >         > Caught SIGSEGV accessing address (nil) >         > Spinning.  Please run 'gdb gst-launch 488' to continue >         debugging, >         > Ctrl-C to quit >         > , or Ctrl-\ to dump core. */ >         > >         > >         > Then I tried, >         > >         > GstElement *elem = >         > GST_ELEMENT_CAST(gst_element_get_parent(GST_ELEMENT(pad))); > > >          Yay, not checking for the return value of >         gst_element_get_parent(). >          YAY, casting a GstPad to a GstElement (!?!?!?!) > >         > elem = GST_ELEMENT_CAST(gst_element_get_parent(elem)); >         > >          Yay, not checking for the return value of >         gst_element_get_parent(). > >         > GstElementClass *kl = GST_ELEMENT_GET_CLASS(elem); > > >          Yay, not checking for the return value of >         GST_ELEMENT_GET_CLASS(). > >         > g_print("In element %s\n", >         > gst_object_get_name((GstObject*)(kl.details->longname)); >         > >         > This again gave pipeline0, where I'm expecting the actual >         name of the >         > element. It would be great if anyone can guide me. > > >          So, to summarize: You're asking for the parent of the parent >         of the >         pad. >          The parent of the pad : The element to which the pad (maybe) >         belongs. >          The parent of the element to which the pad belongs : a >         pipeline. > >          There's nothing wrong in what it's returning, but please... >         if you >         haven't noticed by now... always check the return values of >         functions/methods. It'll avoid you from calling >         methods/functions with >         invalid arguments. > >            Edward > >         > >         > Many thanks in advance, >         > Gireesh > > >         > >         ------------------------------------------------------------------------- >         > This SF.Net email is sponsored by the Moblin Your Move >         Developer's challenge >         > Build the coolest Linux based applications with Moblin SDK & >         win great prizes >         > Grand prize is a trip for two to an Open Source event >         anywhere in the world >         > <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> >         > _______________________________________________ >         Gstreamer-embedded mailing list >         <a href="mailto:Gstreamer-embedded@lists.sourceforge.net" target="_blank">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> > > > </div></div></blockquote></div>