git.slaskete.net - python-gstreamer-examples/blob - example3.py

   1 #!/usr/bin/env python
   2 # Let's see if we can get a viewport working, building on code from example2.py
   3 # Some final info and updated code stolen from
   4 # http://bazaar.launchpad.net/~jderose/+junk/gst-examples/view/head:/video-player-1.0
   5
   6 # GdkX11 to get access to xid, GstVideo to get access to set_window_handle
   7 from gi.repository import Gtk, Gst, GdkX11, GstVideo
   8 import signal
   9
  10 class Main:
  11     def __init__(self):
  12
  13         # Create gui bits and bobs
  14
  15         self.mainwindow = Gtk.Builder()
  16         self.mainwindow.add_from_file("example3.glade")
  17
  18         signals = {
  19             "on_play_clicked" : self.OnPlay,
  20             "on_stop_clicked" : self.OnStop,
  21             "on_quit_clicked" : self.OnQuit,
  22         }
  23
  24         self.mainwindow.connect_signals(signals)
  25
  26         # Create GStreamer bits and bobs
  27
  28         # Initiate the pipeline
  29         Gst.init(None)
  30         self.pipeline = Gst.Pipeline("mypipeline")
  31
  32         # Add a videotestsrc element to the pipeline, set it to pattern "snow."
  33         self.videotestsrc = Gst.ElementFactory.make("videotestsrc", "videosource")
  34         self.videotestsrc.set_property("pattern", "snow")
  35         self.pipeline.add(self.videotestsrc)
  36
  37         # Add a capsfilter that we want to apply to our videotestsrc
  38         self.videotestcaps = Gst.ElementFactory.make("capsfilter", "videotestcaps")
  39         self.videotestcaps.set_property("caps",Gst.Caps.from_string("video/x-raw,width=640,height=480"))
  40         self.pipeline.add(self.videotestcaps)
  41
  42         # Link the capsfilter to the videotestsrc
  43         self.videotestsrc.link(self.videotestcaps)
  44
  45         # Add a videosink element to the pipeline
  46         self.videosink = Gst.ElementFactory.make("autovideosink", "videosink")
  47         self.pipeline.add(self.videosink)
  48
  49         # Link the already linked videotestcaps to the sink
  50         self.videotestcaps.link(self.videosink)
  51
  52         # Set up a bus to our pipeline to get notified when the video is ready
  53         self.bus = self.pipeline.get_bus()
  54         self.bus.enable_sync_message_emission()
  55         self.bus.connect("sync-message::element", self.OnSyncElement)
  56
  57         # Summon the window and connect the window's close button to quit
  58         self.window = self.mainwindow.get_object("mainwindow")
  59         self.window.connect("delete-event", Gtk.main_quit)
  60         self.window.show_all()
  61
  62         # Get window ID of the viewport widget from the GUI
  63         self.win_id = self.mainwindow.get_object("viewport").get_window().get_xid()
  64
  65
  66     # When we get a message that video is ready to display, set the
  67     # correct window id to hook it to our viewport
  68     def OnSyncElement(self, bus, message):
  69         if message.get_structure().get_name() == "prepare-window-handle":
  70             print "prepare-window-handle"
  71             message.src.set_window_handle(self.win_id)
  72
  73     def OnPlay(self, widget):
  74         print "play"
  75         self.pipeline.set_state(Gst.State.PLAYING)
  76
  77     def OnStop(self, widget):
  78         print "stop"
  79         self.pipeline.set_state(Gst.State.READY)
  80
  81     def OnQuit(self, widget):
  82         print "quit"
  83         Gtk.main_quit()
  84
  85     # Workaround to get Ctrl+C to terminate from command line
  86     # ref: https://bugzilla.gnome.org/show_bug.cgi?id=622084#c12
  87     signal.signal(signal.SIGINT, signal.SIG_DFL)
  88
  89 start = Main()
  90 Gtk.main()