qt gstreamer android

#include <glib.h>
#include <gst/gst.h>
#include <gst/interfaces/xoverlay.h>

#include <QApplication>
#include <QTimer>
#include <QWidget>

int main(int argc, char *argv[]) {
  gst_init(&argc, &argv);
  QApplication app(argc, argv);
  app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));

  QCoreApplication::setAttribute(Qt::AA_NativeWindows);

  QWidget window;
  window.resize(320, 240);
  window.setWindowTitle("GstVideoOverlay Qt demo");
  window.show();

  GError *error = NULL;
  GstElement *pipeline = gst_parse_launch("playbin2", &error);
  if (error) {
    gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message);
    g_clear_error (&error);
    g_free (message);
    return NULL;
  }
  g_object_set(pipeline, "uri", "http://docs.gstreamer.com/media/sintel_trailer-368p.ogv", NULL);
  gst_element_set_state(pipeline, GST_STATE_READY);
  gst_x_overlay_expose(GST_X_OVERLAY(pipeline));
  gst_x_overlay_expose(GST_X_OVERLAY(pipeline));
  unsigned long winid = window.winId();
  QApplication::syncX();
  gst_x_overlay_set_window_handle(GST_X_OVERLAY(pipeline), winid);

  // run the pipeline
  GstStateChangeReturn sret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
  if(sret == GST_STATE_CHANGE_FAILURE) {
    gst_element_set_state(pipeline, GST_STATE_NULL);
    gst_object_unref(pipeline);
    // Exit application
    QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
  }

  int ret = app.exec();

  window.hide();
  gst_element_set_state(pipeline, GST_STATE_NULL);
  gst_object_unref(pipeline);

  return ret;
}