gistfile1.c

#include <gst/gst.h>
static void cb_new_pad (GstElement *element, GstPad *pad, gpointer data)
{
  gchar *name;
  name = gst_pad_get_name (pad);
  g_print ("A new pad %s was created\n", name);
  g_free (name);
  /* here, you would setup a new pad link for the newly created pad */
  [..]
}

int main (int argc, char *argv[])
{
  GstElement *pipeline, *source, *demux;
  GMainLoop *loop;
  
  /* init */
  gst_init (&argc, &argv);

  /* create elements */
  pipeline = gst_pipeline_new ("my_pipeline");
  source = gst_element_factory_make ("filesrc", "source");
  g_object_set (source, "location", argv[1], NULL);
  demux = gst_element_factory_make ("oggdemux", "demuxer");

  /* you would normally check that the elements were created properly */
  /* put together a pipeline */
  gst_bin_add_many (GST_BIN (pipeline), source, demux, NULL);
  gst_element_link_pads (source, "src", demux, "sink");

  /* listen for newly created pads */
  g_signal_connect (demux, "pad-added", G_CALLBACK (cb_new_pad), NULL);
  
  /* start the pipeline */
  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
  loop = g_main_loop_new (NULL, FALSE);
  g_main_loop_run (loop);
  [..]
}