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 element = GST_ELEMENT (GST_OBJECT_PARENT (rpad)); from line no 678, 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 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 On Thu, Nov 6, 2008 at 9:44 PM, Edward Hervey <edward.hervey at collabora.co.uk > wrote: > 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. > > Fair enough, in that case don't mention the segfaults. > > > 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()) > > 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_*(). > > > 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 > > <edward.hervey at collabora.co.uk> 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 > > > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > > > _______________________________________________ > > Gstreamer-embedded mailing list > > Gstreamer-embedded at lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/gstreamer-embedded > > > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/gstreamer-embedded/attachments/20081107/1fd825fc/attachment.htm>
