examples: also add sink detection and set title to qt examples

Also set a title in the qt examples like it is now done in the gtk example.
Fix the newly added find_video_sink in the gtk example and add similar function
to the qt examples.

3 files changed, 119 insertions, 22 deletions

diff --git a/tests/examples/overlay/gtk-xoverlay.c b/tests/examples/overlay/gtk-xoverlay.c
index 2bde191b..9a08c95f 100644
--- a/tests/examples/overlay/gtk-xoverlay.c
+++ b/tests/examples/overlay/gtk-xoverlay.c
@@ -42,44 +42,49 @@ window_closed (GtkWidget * widget, GdkEvent * event, gpointer user_data)
   gtk_main_quit ();
 }
 
-/* slightly convoluted way to find a working video sink that's not a bin */
+/* slightly convoluted way to find a working video sink that's not a bin,
+ * one could use autovideosink from gst-plugins-good instead
+ */
 static GstElement *
 find_video_sink (void)
 {
   GstStateChangeReturn sret;
   GstElement *sink;
 
-  sink = gst_element_factory_make ("xvimagesink", NULL);
-  sret = gst_element_set_state (sink, GST_STATE_READY);
-  if (sret == GST_STATE_CHANGE_SUCCESS)
-    return sink;
+  if ((sink = gst_element_factory_make ("xvimagesink", NULL))) {
+    sret = gst_element_set_state (sink, GST_STATE_READY);
+    if (sret == GST_STATE_CHANGE_SUCCESS)
+      return sink;
 
-  gst_element_set_state (sink, GST_STATE_NULL);
+    gst_element_set_state (sink, GST_STATE_NULL);
+  }
   gst_object_unref (sink);
 
-  sink = gst_element_factory_make ("ximagesink", NULL);
-  sret = gst_element_set_state (sink, GST_STATE_READY);
-  if (sret == GST_STATE_CHANGE_SUCCESS)
-    return sink;
+  if ((sink = gst_element_factory_make ("ximagesink", NULL))) {
+    sret = gst_element_set_state (sink, GST_STATE_READY);
+    if (sret == GST_STATE_CHANGE_SUCCESS)
+      return sink;
 
-  gst_element_set_state (sink, GST_STATE_NULL);
+    gst_element_set_state (sink, GST_STATE_NULL);
+  }
   gst_object_unref (sink);
 
   if (strcmp (DEFAULT_VIDEOSINK, "xvimagesink") == 0 ||
       strcmp (DEFAULT_VIDEOSINK, "ximagesink") == 0)
     return NULL;
 
-  sink = gst_element_factory_make (DEFAULT_VIDEOSINK, NULL);
-  if (GST_IS_BIN (sink)) {
-    gst_object_unref (sink);
-    return NULL;
-  }
+  if ((sink = gst_element_factory_make (DEFAULT_VIDEOSINK, NULL))) {
+    if (GST_IS_BIN (sink)) {
+      gst_object_unref (sink);
+      return NULL;
+    }
 
-  sret = gst_element_set_state (sink, GST_STATE_READY);
-  if (sret == GST_STATE_CHANGE_SUCCESS)
-    return sink;
+    sret = gst_element_set_state (sink, GST_STATE_READY);
+    if (sret == GST_STATE_CHANGE_SUCCESS)
+      return sink;
 
-  gst_element_set_state (sink, GST_STATE_NULL);
+    gst_element_set_state (sink, GST_STATE_NULL);
+  }
   gst_object_unref (sink);
   return NULL;
 }
diff --git a/tests/examples/overlay/qt-xoverlay.cpp b/tests/examples/overlay/qt-xoverlay.cpp
index a1ba7c37..7edfabb7 100644
--- a/tests/examples/overlay/qt-xoverlay.cpp
+++ b/tests/examples/overlay/qt-xoverlay.cpp
@@ -31,6 +31,53 @@
 #include <QTimer>
 #include <QWidget>
 
+/* slightly convoluted way to find a working video sink that's not a bin,
+ * one could use autovideosink from gst-plugins-good instead
+ */
+static GstElement *
+find_video_sink (void)
+{
+  GstStateChangeReturn sret;
+  GstElement *sink;
+
+  if ((sink = gst_element_factory_make ("xvimagesink", NULL))) {
+    sret = gst_element_set_state (sink, GST_STATE_READY);
+    if (sret == GST_STATE_CHANGE_SUCCESS)
+      return sink;
+  
+    gst_element_set_state (sink, GST_STATE_NULL);
+  }
+  gst_object_unref (sink);
+
+  if ((sink = gst_element_factory_make ("ximagesink", NULL))) {
+    sret = gst_element_set_state (sink, GST_STATE_READY);
+    if (sret == GST_STATE_CHANGE_SUCCESS)
+      return sink;
+  
+    gst_element_set_state (sink, GST_STATE_NULL);
+  }
+  gst_object_unref (sink);
+
+  if (strcmp (DEFAULT_VIDEOSINK, "xvimagesink") == 0 ||
+      strcmp (DEFAULT_VIDEOSINK, "ximagesink") == 0)
+    return NULL;
+
+  if ((sink = gst_element_factory_make (DEFAULT_VIDEOSINK, NULL))) {
+    if (GST_IS_BIN (sink)) {
+      gst_object_unref (sink);
+      return NULL;
+    }
+  
+    sret = gst_element_set_state (sink, GST_STATE_READY);
+    if (sret == GST_STATE_CHANGE_SUCCESS)
+      return sink;
+  
+    gst_element_set_state (sink, GST_STATE_NULL);
+  }
+  gst_object_unref (sink);
+  return NULL;
+}
+
 int main(int argc, char *argv[])
 {
   if (!g_thread_supported ())
@@ -44,7 +91,11 @@ int main(int argc, char *argv[])
 
   GstElement *pipeline = gst_pipeline_new ("xvoverlay");
   GstElement *src = gst_element_factory_make ("videotestsrc", NULL);
-  GstElement *sink = gst_element_factory_make ("xvimagesink", NULL);
+  GstElement *sink = find_video_sink ();
+
+  if (sink == NULL)
+    g_error ("Couldn't find a working video sink.");
+
   gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
   gst_element_link (src, sink);
   
@@ -52,6 +103,7 @@ int main(int argc, char *argv[])
 
   QWidget window;
   window.resize(320, 240);
+  window.setWindowTitle("GstXOverlay Qt demo");
   window.show();
   
   WId xwinid = window.winId();
diff --git a/tests/examples/overlay/qtgv-xoverlay.cpp b/tests/examples/overlay/qtgv-xoverlay.cpp
index 74159c4b..69252864 100644
--- a/tests/examples/overlay/qtgv-xoverlay.cpp
+++ b/tests/examples/overlay/qtgv-xoverlay.cpp
@@ -32,9 +32,48 @@
 
 SinkPipeline::SinkPipeline(QGraphicsView *parent) : QObject(parent)
 {
+  GstStateChangeReturn sret;
+  
   pipeline = gst_pipeline_new ("xvoverlay");
   src = gst_element_factory_make ("videotestsrc", NULL);
-  sink = gst_element_factory_make ("xvimagesink", NULL);
+
+  if ((sink = gst_element_factory_make ("xvimagesink", NULL))) {
+    sret = gst_element_set_state (sink, GST_STATE_READY);
+    if (sret != GST_STATE_CHANGE_SUCCESS) {
+      gst_element_set_state (sink, GST_STATE_NULL);
+      gst_object_unref (sink);
+  
+      if ((sink = gst_element_factory_make ("ximagesink", NULL))) {
+        sret = gst_element_set_state (sink, GST_STATE_READY);
+        if (sret != GST_STATE_CHANGE_SUCCESS) {
+          gst_element_set_state (sink, GST_STATE_NULL);
+          gst_object_unref (sink);
+    
+          if (strcmp (DEFAULT_VIDEOSINK, "xvimagesink") != 0 &&
+              strcmp (DEFAULT_VIDEOSINK, "ximagesink") != 0) {
+    
+            if ((sink = gst_element_factory_make (DEFAULT_VIDEOSINK, NULL))) {
+              if (!GST_IS_BIN (sink)) {
+                sret = gst_element_set_state (sink, GST_STATE_READY);
+                if (sret != GST_STATE_CHANGE_SUCCESS) {
+                  gst_element_set_state (sink, GST_STATE_NULL);
+                  gst_object_unref (sink);
+                  sink = NULL;
+                }
+              } else {
+                gst_object_unref (sink);
+                sink = NULL;
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  if (sink == NULL)
+    g_error ("Couldn't find a working video sink.");
+
   gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
   gst_element_link (src, sink);
   xwinid = parent->winId();
@@ -74,6 +113,7 @@ int main( int argc, char **argv )
 
     QGraphicsView view( &scene );
     view.resize(320, 240);
+    view.setWindowTitle("GstXOverlay Qt GraphicsView demo");
     view.show();
 
     gst_init (&argc, &argv);