Not able to call handoff callback

[Mayank Agarwal]

Hi,

I have modified basic tutorial two to include identity element but
i am not able to get the callback called.

Here is the example

#include <gst/gst.h>

static void
handoff(GstElement *object,
GstBuffer *arg0,
GstPad *arg1,
gpointer user_data)
{

printf("comes here");

}




int main(int argc, char *argv[]) {
  GstElement *pipeline, *source, *sink;
  GstBus *bus;
  GstMessage *msg;
  GstStateChangeReturn ret;
  GstElement *identity;

  /* Initialize GStreamer */
  gst_init (&argc, &argv);

  /* Create the elements */
  source = gst_element_factory_make ("videotestsrc", "source");

  sink = gst_element_factory_make ("autovideosink", "sink");

  /* Create the empty pipeline */
  pipeline = gst_pipeline_new ("test-pipeline");

  if (!pipeline || !source || !sink) {
    g_printerr ("Not all elements could be created.\n");
    return -1;
  }

  /* Build the pipeline */
  gst_bin_add_many (GST_BIN (pipeline), source, sink, NULL);
  if (gst_element_link (source, sink) != TRUE) {
    g_printerr ("Elements could not be linked.\n");
    gst_object_unref (pipeline);
    return -1;
  }

  /* Modify the source's properties */
  g_object_set (source, "pattern", 0, NULL);
  g_object_set(G_OBJECT(sink), "signal-handoffs", TRUE, NULL);
  g_signal_connect(sink, "handoff",G_CALLBACK(handoff), NULL);

  /* Start playing */
  ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
  if (ret == GST_STATE_CHANGE_FAILURE) {
    g_printerr ("Unable to set the pipeline to the playing state.\n");
    gst_object_unref (pipeline);
    return -1;
  }

  /* Wait until error or EOS */
  bus = gst_element_get_bus (pipeline);
  msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_ERROR | GST_MESSAGE_EOS);

  /* Parse message */
  if (msg != NULL) {
    GError *err;
    gchar *debug_info;

    switch (GST_MESSAGE_TYPE (msg)) {
      case GST_MESSAGE_ERROR:
        gst_message_parse_error (msg, &err, &debug_info);
        g_printerr ("Error received from element %s: %s\n",
GST_OBJECT_NAME (msg->src), err->message);
        g_printerr ("Debugging information: %s\n", debug_info ?
debug_info : "none");
        g_clear_error (&err);
        g_free (debug_info);
        break;
      case GST_MESSAGE_EOS:
        g_print ("End-Of-Stream reached.\n");
        break;
      default:
        /* We should not reach here because we only asked for ERRORs and EOS */
        g_printerr ("Unexpected message received.\n");
        break;
    }
    gst_message_unref (msg);
  }

  /* Free resources */
  gst_object_unref (bus);
  gst_element_set_state (pipeline, GST_STATE_NULL);
  gst_object_unref (pipeline);
  return 0;
}


and the errors i am getting are:

(btutorialtwo:3807): GLib-GObject-WARNING **: g_object_set_valist:
object class 'GstAutoVideoSink' has no property named
'signal-handoffs'

(btutorialtwo:3807): GLib-GObject-WARNING **:
/build/buildd/glib2.0-2.40.2/./gobject/gsignal.c:2462: signal
'handoff' is invalid for instance '0x9950018' of type
'GstAutoVideoSink'

although videotestsrc is playing fine.

If this is not the correct way of using identity element any
example/links of using identity element using which
i can be able to calculate video frame rate.


Regards
Mayank