Re: [gst-embedded] plugin class_init not called from test application but called from gst-inspect

[Stefan K. <en...@ho...>]

ssn schrieb:
> Hi,
> 
> I am in the process of testing my gstreamer plugin element. I want to add a property to my gst element and I do that in the
> my_element_class_init
> method. I wrote my own test application to test my pipeline as I have a few elements that need to be linked in a certain order. My observation is that when I run
> gst-inspect-0.10 my_element
> I can see the property that I added to my_element. However, when I run my test app, the app does not recognize the property in the element that I want access to.
> 
> I install the property in the my_element_class_init method by calling
> g_object_class_install_property.
> 
> This method does not seem to be called when I run my test app, but does get called by gst-inspect-0.10. Since the gst element is not initialized correctly in  my app, I cannot proceed further. There is probably something basic that I am missing.
> 

I am afraid we need to se you element sources too. Does the loop that prints the
object properties below print anything?

Stefan

> This is a subset of the app code for your reference:
> int main (int   argc, char *argv[])
> {
>   GMainLoop *loop;
> 
>   GstElement *pipeline, *my_element;
>   GstBus *bus;
>   gboolean gstRVal;
>   char *filename;
>   GstElementFactory *factory;
> 
> 
>   /* Initialisation */
>   gst_init (NULL, NULL);
> 
>   loop = g_main_loop_new (NULL, FALSE);
>   /* Create gstreamer elements */
>   pipeline = gst_pipeline_new ("my-plugin-test");
>   my_element = gst_element_factory_make ("my-element", NULL);
>  {
> 	  GParamSpec *spec, **specs, **walk;
> 	  guint nProps;
> 
> 	  specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (my_element), &nProps);
> 	  g_print ("Element my_element: Num Properties: %d...\n", nProps);
> 	  for (walk = specs; *walk; walk++) {
> 		spec = *walk;
> 		g_print ("Element my_element: property name [%s]...\n", spec->name);
> 	  }
>           g_free (specs);
> }
>   bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
>   gst_bus_add_watch (bus, bus_call, loop);
>   gst_object_unref (bus);
> 
>   gst_bin_add_many (GST_BIN (pipeline), my_element, NULL);
> 
>   g_print ("Running...\n");
>   gst_element_set_state (pipeline, GST_STATE_PLAYING);
>   g_main_loop_run (loop);
> 
>   g_print ("Returned, stopping playback\n");
>   gst_element_set_state (pipeline, GST_STATE_NULL);
> 
>   g_print ("Deleting pipeline\n");
>   gst_object_unref (GST_OBJECT (pipeline));
> 
>   return 0;
> 
> 
> Thanks for your advice.
> - SSN