examples: add a simple Maemo 5 example

examples/Makefile.am

@@ -16,6 +16,7 @@ examples_DATA = 	\
 	remuxer.py	\
 	sinkelement.py  \
 	vumeter.py	\
-	decodebin.py
+	decodebin.py	\
+	maemogst.py
 
 EXTRA_DIST = $(examples_DATA)

examples/maemogst.py

@@ -0,0 +1,101 @@
+import gobject
+gobject.threads_init()
+import gtk
+gtk.gdk.threads_init()
+import hildon
+import gst
+import sys
+
+# VideoWidget taken from play.py in gst-python examples
+class VideoWidget(gtk.DrawingArea):
+    def __init__(self):
+        gtk.DrawingArea.__init__(self)
+        self.imagesink = None
+        self.unset_flags(gtk.DOUBLE_BUFFERED)
+
+    def do_expose_event(self, event):
+        if self.imagesink:
+            self.imagesink.expose()
+            return False
+        else:
+            return True
+
+    def set_sink(self, sink):
+        assert self.window.xid
+        self.imagesink = sink
+        self.imagesink.set_xwindow_id(self.window.xid)
+
+class MaemoGstView:
+
+    def __init__(self):
+        # hildon has one program instance per app, so get instance
+        self.p = hildon.Program.get_instance()
+        # set name of application: this shows in titlebar
+        gtk.set_application_name("Maemo GStreamer VideoTest")
+        # stackable window in case we want more windows in future in app
+        self.w = hildon.StackableWindow()
+        box = gtk.VBox()
+        self.video_widget = VideoWidget()
+        # video widget we want to expand to size
+        box.pack_start(self.video_widget, True, True, 0)
+        # a button finger height to play/pause 
+        self.button = hildon.Button(gtk.HILDON_SIZE_FINGER_HEIGHT,
+            hildon.BUTTON_ARRANGEMENT_VERTICAL, title="Pause")
+        self.button.connect_after("clicked", self.on_button_clicked)
+        # don't want button to expand or fill, just stay finger height
+        box.pack_start(self.button, False, False, 0)
+        self.w.add(box)
+        self.w.connect("delete-event", gtk.main_quit)
+        self.p.add_window(self.w)
+        self.w.show_all()
+        self.start_streaming()
+
+    def start_streaming(self):
+        # we use ximagesink solely for screenshotting ability
+        # less cpu usage would happen with videotestsrc ! xvimagesink
+        self.pipeline = \
+            gst.parse_launch("videotestsrc ! videoscale ! ximagesink")
+        bus = self.pipeline.get_bus()
+        # need to connect to sync message handler so we get the sink to be
+        # embedded at the right time and not have a temporary new window
+        bus.enable_sync_message_emission()
+        bus.add_signal_watch()
+        bus.connect("sync-message::element", self.on_sync_message)
+        bus.connect("message", self.on_message)
+        self.pipeline.set_state(gst.STATE_PLAYING)
+
+    def on_sync_message(self, bus, message):
+        if message.structure is None:
+            return
+        if message.structure.get_name() == 'prepare-xwindow-id':
+            # all this is needed to sync with the X server before giving the
+            # x id to the sink
+            gtk.gdk.threads_enter()
+            gtk.gdk.display_get_default().sync()
+            self.video_widget.set_sink(message.src)
+            message.src.set_property("force-aspect-ratio", True)
+            gtk.gdk.threads_leave()
+
+    def on_message(self, bus, message):
+        if message.type == gst.MESSAGE_ERROR:
+            err, debug = message.parse_error()
+            hildon.hildon_banner_show_information(self.w, '', 
+                "Error: %s" % err)
+
+    def on_button_clicked(self, widget):
+        success, state, pending = self.pipeline.get_state(1)
+        # do not listen if in middle of state change
+        if not pending:
+            if state == gst.STATE_PLAYING:
+                self.pipeline.set_state(gst.STATE_PAUSED)
+                self.button.set_label("Play")
+            else:
+                self.pipeline.set_state(gst.STATE_PLAYING)
+                self.button.set_label("Pause")
+
+def main():
+    view = MaemoGstView()
+    gtk.main()
+
+if __name__ == '__main__':
+    sys.exit(main())