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.
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
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