[gstreamer-bugs] [Bug 437652] New: Playbin Element Blocks GUI and MainLoop

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins | Ver: 0.10.12
           Summary: Playbin Element Blocks GUI and MainLoop
           Product: GStreamer
           Version: 0.10.12
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: Normal
         Component: gst-plugins
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: mystilleef at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.17/2.18
   GNOME milestone: Unspecified


The Playbin element blocks the GUI and MainLoop when changing its state
to PAUSE or PLAY on some URIs. I attached a test code to reproduce the
problem.

The code has a good stream (self.__nice_stream) that works. And a bad 
stream (self.__bad_stream) that exposes the problem. You can change 
these streams in the self.__play_uri() method.

To run the code, type

python test.py

File test.py
========================================================================

class MyPlayBin(object):

        def __init__(self):
                self.__init_attributes()
                self.__arrange_widgets()
                self.__window.connect("delete-event", self.__delete_event_cb)
                self.__play_button.connect("clicked",
self.__clicked_play_button_cb)
                self.__stop_button.connect("clicked",
self.__clicked_stop_button_cb)
                self.__window.show_all()

        def __init_attributes(self):
                self.__bad_stream = "http://66.250.45.118:7204"
                self.__nice_stream =
"http://scfire-ntc0l-2.stream.aol.com:80/stream/1074"
                from gst import element_factory_make
                self.__element = element_factory_make("playbin",
"MainPipeline")
                self.__bus = self.__element.get_bus()
                self.__bus.add_signal_watch()
                self.__bus.connect("message::buffering", self.__buffering_cb)
                from gtk import Window, Label, Button
                from gtk import STOCK_MEDIA_PLAY, STOCK_MEDIA_PAUSE
                self.__label = Label("READY")
                self.__play_button = Button(stock=STOCK_MEDIA_PLAY)
                self.__stop_button = Button(stock=STOCK_MEDIA_PAUSE)
                self.__window = Window()
                return

        def __play_uri(self):
                self.__stop()
                self.__label.set_text("Preparing to play")
                from gst import STATE_PAUSED
                self.__element.set_property("uri", self.__bad_stream)
                self.__element.set_state(STATE_PAUSED)
                return False

        def __stop(self):
                from gst import STATE_NULL, STATE_READY
                self.__element.set_state(STATE_READY)
                self.__element.set_state(STATE_NULL)
                self.__label.set_text("Paused")
                return

        def __buffering_cb(self, bus, data):
                from gst import STATE_PAUSED, STATE_PLAYING
                percentage = data.structure["buffer-percent"]
                if percentage == 100:
                        self.__element.set_state(STATE_PLAYING)
                        self.__label.set_text("Playing")
                else:
                        self.__element.set_state(STATE_PAUSED)
                        message = "%s buffering..." % percentage
                        self.__label.set_text(message)
                return

        def __arrange_widgets(self):
                self.__window.set_title("MyPlayBin")
                self.__window.set_border_width(10)
                from gtk import VBox, HBox
                vbox = VBox(spacing=10)
                hbox = HBox(spacing=20)
                self.__window.add(vbox)
                vbox.pack_start(self.__label, True, True, 0)
                vbox.pack_start(hbox)
                hbox.pack_start(self.__play_button, True, True, 0)
                hbox.pack_start(self.__stop_button, True, True, 0)
                return

        def __clicked_play_button_cb(self, *args):
                self.__play_uri()
                return False

        def __clicked_stop_button_cb(self, *args):
                self.__stop()
                return False

        def __delete_event_cb(self, *args):
                raise SystemExit
                return True

if __name__ == "__main__":
        from gobject import threads_init, MainLoop
        threads_init()
        MyPlayBin()
        MainLoop().run()

========================================================================


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