getting running on linux desktop

main.cpp

@@ -0,0 +1,87 @@
+#include <QApplication>
+#include <QQmlApplicationEngine>
+#include <QQuickWindow>
+#include <QQuickItem>
+#include <QRunnable>
+#include <gst/gst.h>
+
+class SetPlaying : public QRunnable
+{
+public:
+  SetPlaying(GstElement *);
+  ~SetPlaying();
+
+  void run ();
+
+private:
+  GstElement * pipeline_;
+};
+
+SetPlaying::SetPlaying (GstElement * pipeline)
+{
+  this->pipeline_ = pipeline ? static_cast<GstElement *> (gst_object_ref (pipeline)) : NULL;
+}
+
+SetPlaying::~SetPlaying ()
+{
+  if (this->pipeline_)
+    gst_object_unref (this->pipeline_);
+}
+
+void
+SetPlaying::run ()
+{
+  if (this->pipeline_)
+    gst_element_set_state (this->pipeline_, GST_STATE_PLAYING);
+}
+
+int main(int argc, char *argv[])
+{
+  int ret;
+
+  gst_init (&argc, &argv);
+
+  {
+    QGuiApplication app(argc, argv);
+
+    GstElement *pipeline = gst_pipeline_new (NULL);
+    GstElement *src = gst_element_factory_make ("videotestsrc", NULL);
+    GstElement *capsfilter = gst_element_factory_make ("capsfilter", NULL);
+    GstCaps *caps = gst_caps_from_string ("video/x-raw,format=YV12");
+    g_object_set (capsfilter, "caps", caps, NULL);
+    gst_caps_unref (caps);
+    GstElement *glupload = gst_element_factory_make ("glupload", NULL);
+    /* the plugin must be loaded before loading the qml file to register the
+     * GstGLVideoItem qml item */
+    GstElement *sink = gst_element_factory_make ("qmlglsink", NULL);
+
+    g_assert (src && glupload && sink);
+
+    gst_bin_add_many (GST_BIN (pipeline), src, capsfilter, glupload, sink, NULL);
+    gst_element_link_many (src, capsfilter, glupload, sink, NULL);
+
+    QQmlApplicationEngine engine;
+    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
+
+    QQuickItem *videoItem;
+    QQuickWindow *rootObject;
+
+    /* find and set the videoItem on the sink */
+    rootObject = static_cast<QQuickWindow *> (engine.rootObjects().first());
+    videoItem = rootObject->findChild<QQuickItem *> ("videoItem");
+    g_assert (videoItem);
+    g_object_set(sink, "widget", videoItem, NULL);
+
+    rootObject->scheduleRenderJob (new SetPlaying (pipeline),
+        QQuickWindow::BeforeSynchronizingStage);
+
+    ret = app.exec();
+
+    gst_element_set_state (pipeline, GST_STATE_NULL);
+    gst_object_unref (pipeline);
+  }
+
+  gst_deinit ();
+
+  return ret;
+}