Update

subprojects/gst-plugins-good/tests/examples/qt/qmlsrc/main.cpp

@@ -0,0 +1,80 @@
+#include <QApplication>
+#include <QQmlApplicationEngine>
+#include <QQuickWindow>
+#include <QQuickItem>
+#include <QQuickView>
+#include <QRunnable>
+#include <QDebug>
+#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;
+
+  QGuiApplication app(argc, argv);
+  gst_init (&argc, &argv);
+
+  GstElement *pipeline = gst_pipeline_new (NULL);
+  GstElement *src = gst_element_factory_make ("qmlglsrc", NULL);
+  GstElement *sink = gst_element_factory_make ("glimagesink", NULL); 
+
+  g_assert (src && sink);
+
+  gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
+  gst_element_link_many (src, sink, NULL);
+
+  QQmlApplicationEngine engine;
+  engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
+
+  QQuickWindow *rootObject;
+
+  /* find and set the QQuickWindow on the src */
+  rootObject = static_cast<QQuickWindow *> (engine.rootObjects().first());
+  g_object_set(src, "window", rootObject, NULL);
+  g_object_set(src, "use-default-fbo", TRUE, NULL);
+  /* output buffer of qmlglsrc is vertical flip, get the image orientation tag */
+  g_object_set(sink, "rotate-method", 8, 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;
+}