Switch to statically linked qmlglsink if system does not have preinstalled one

qgroundcontrol.pro

@@ -331,6 +331,13 @@ contains (DEFINES, QGC_DISABLE_PAIRING) {
     DEFINES += QGC_ENABLE_PAIRING
 }
 
+
+#
+# Add qmlglsink (libs/gst-plugins-good/ext/qt)
+#
+
+include(qmlglsink.pri)
+
 #
 # External library configuration
 #

qmlglsink.pri

+LinuxBuild {
+    DEFINES += HAVE_QT_X11 HAVE_QT_EGLFS HAVE_QT_WAYLAND
+} else:MacBuild {
+    DEFINES += HAVE_QT_MAC
+} else:iOSBuild {
+    DEFINES += HAVE_QT_IOS
+} else:WindowsBuild {
+    DEFINES += HAVE_QT_WIN32
+    LIBS += opengl32.lib
+} else:AndroidBuild {
+    DEFINES += HAVE_QT_ANDROID
+}
+
+SOURCES += \
+    libs/gst-plugins-good/ext/qt/gstplugin.cc \
+    libs/gst-plugins-good/ext/qt/gstqtglutility.cc \
+    libs/gst-plugins-good/ext/qt/gstqsgtexture.cc \
+    libs/gst-plugins-good/ext/qt/gstqtsink.cc \
+    libs/gst-plugins-good/ext/qt/gstqtsrc.cc \
+    libs/gst-plugins-good/ext/qt/qtwindow.cc \
+    libs/gst-plugins-good/ext/qt/qtitem.cc
+
+HEADERS += \
+    libs/gst-plugins-good/ext/qt/gstqsgtexture.h \
+    libs/gst-plugins-good/ext/qt/gstqtgl.h \
+    libs/gst-plugins-good/ext/qt/gstqtglutility.h \
+    libs/gst-plugins-good/ext/qt/gstqtsink.h \
+    libs/gst-plugins-good/ext/qt/gstqtsrc.h \
+    libs/gst-plugins-good/ext/qt/qtwindow.h \
+    libs/gst-plugins-good/ext/qt/qtitem.h

src/VideoStreaming/VideoStreaming.cc

@@ -43,10 +43,12 @@
     GST_PLUGIN_STATIC_DECLARE(rtpmanager);
     GST_PLUGIN_STATIC_DECLARE(isomp4);
     GST_PLUGIN_STATIC_DECLARE(matroska);
+    GST_PLUGIN_STATIC_DECLARE(opengl);
 #endif
 #if defined(__android__)
     GST_PLUGIN_STATIC_DECLARE(androidmedia);
 #endif
+    GST_PLUGIN_STATIC_DECLARE(qmlgl);
     G_END_DECLS
 #endif
 
@@ -158,21 +160,32 @@ void initializeVideoStreaming(int &argc, char* argv[], char* logpath, char* debu
         GST_PLUGIN_STATIC_REGISTER(matroska);
         GST_PLUGIN_STATIC_REGISTER(androidmedia);
     #endif
-#else
-    Q_UNUSED(argc);
-    Q_UNUSED(argv);
-    Q_UNUSED(logpath);
-    Q_UNUSED(debuglevel);
+
+#if defined(__mobile__)
+        GST_PLUGIN_STATIC_REGISTER(opengl);
 #endif
+
     /* the plugin must be loaded before loading the qml file to register the
      * GstGLVideoItem qml item
      * FIXME Add a QQmlExtensionPlugin into qmlglsink to register GstGLVideoItem
      * with the QML engine, then remove this */
-    GstElement *sink = gst_element_factory_make ("qmlglsink", NULL);
-    if (sink != NULL) {
+    GstElement *sink = gst_element_factory_make("qmlglsink", nullptr);
+
+    if (sink == nullptr) {
+        GST_PLUGIN_STATIC_REGISTER(qmlgl);
+        sink = gst_element_factory_make("qmlglsink", nullptr);
+    }
+
+    if (sink != nullptr) {
         gst_object_unref(sink);
-        sink = NULL;
+        sink = nullptr;
     } else {
         qCritical() << "unable to find qmlglsink - you need to build it yourself and add to GST_PLUGIN_PATH";
     }
+#else
+    Q_UNUSED(argc);
+    Q_UNUSED(argv);
+    Q_UNUSED(logpath);
+    Q_UNUSED(debuglevel);
+#endif
 }

src/VideoStreaming/VideoStreaming.pri

@@ -12,9 +12,10 @@
 #
 
 LinuxBuild {
+    QT += x11extras waylandclient
     CONFIG += link_pkgconfig
     packagesExist(gstreamer-1.0) {
-        PKGCONFIG   += gstreamer-1.0  gstreamer-video-1.0
+        PKGCONFIG   += gstreamer-1.0  gstreamer-video-1.0 gstreamer-gl-1.0
         CONFIG      += VideoEnabled
     }
 } else:MacBuild {
@@ -39,10 +40,11 @@ LinuxBuild {
     exists($$GST_ROOT) {
         CONFIG      += VideoEnabled
 
-        LIBS        += -L$$GST_ROOT/lib -lgstreamer-1.0 -lgstvideo-1.0 -lgstbase-1.0
+        LIBS        += -L$$GST_ROOT/lib -lgstreamer-1.0 -lgstgl-1.0 -lgstvideo-1.0 -lgstbase-1.0
         LIBS        += -lglib-2.0 -lintl -lgobject-2.0
 
         INCLUDEPATH += \
+            $$GST_ROOT/include \
             $$GST_ROOT/include/gstreamer-1.0 \
             $$GST_ROOT/include/glib-2.0 \
             $$GST_ROOT/lib/gstreamer-1.0/include \
@@ -86,10 +88,12 @@ LinuxBuild {
             -lgstrtpmanager \
             -lgstisomp4 \
             -lgstmatroska \
-            -lgstandroidmedia
+            -lgstandroidmedia \
+            -lgstopengl
 
         # Rest of GStreamer dependencies
         LIBS += -L$$GST_ROOT/lib \
+            -lgraphene-1.0 -ljpeg -lpng16 \
             -lgstfft-1.0 -lm  \
             -lgstnet-1.0 -lgio-2.0 \
             -lgstphotography-1.0 -lgstgl-1.0 -lEGL \