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 import gi, signal
   8 gi.require_version('Gtk', '3.0')
   9 gi.require_version('Gst', '1.0')
  10 gi.require_version('GstVideo', '1.0')
  11 from gi.repository import Gtk, Gst, GdkX11, GstVideo
  12
  13 class Main:
  14     def __init__(self):
  15
  16         # Create gui bits and bobs
  17
  18         self.mainwindow = Gtk.Builder()
  19         self.mainwindow.add_from_file("example3.glade")
  20
  21         signals = {
  22             "on_play_clicked" : self.OnPlay,
  23             "on_stop_clicked" : self.OnStop,
  24             "on_quit_clicked" : self.OnQuit,
  25         }
  26
  27         self.mainwindow.connect_signals(signals)
  28
  29         # Create GStreamer bits and bobs
  30
  31         # Initiate the pipeline
  32         Gst.init(None)
  33         self.pipeline = Gst.Pipeline()
  34
  35         # Add a videotestsrc element to the pipeline, set it to pattern "snow."
  36         self.videotestsrc = Gst.ElementFactory.make("videotestsrc", "videosource")
  37         self.videotestsrc.set_property("pattern", "snow")
  38         self.pipeline.add(self.videotestsrc)
  39
  40         # Add a capsfilter that we want to apply to our videotestsrc
  41         self.videotestcaps = Gst.ElementFactory.make("capsfilter", "videotestcaps")
  42         self.videotestcaps.set_property("caps",Gst.Caps.from_string("video/x-raw,width=640,height=480"))
  43         self.pipeline.add(self.videotestcaps)
  44
  45         # Link the capsfilter to the videotestsrc
  46         self.videotestsrc.link(self.videotestcaps)
  47
  48         # Add a videosink element to the pipeline
  49         self.videosink = Gst.ElementFactory.make("autovideosink", "videosink")
  50         self.pipeline.add(self.videosink)
  51
  52         # Link the already linked videotestcaps to the sink
  53         self.videotestcaps.link(self.videosink)
  54
  55         # Set up a bus to our pipeline to get notified when the video is ready
  56         self.bus = self.pipeline.get_bus()
  57         self.bus.enable_sync_message_emission()
  58         self.bus.connect("sync-message::element", self.OnSyncElement)
  59
  60         # Summon the window and connect the window's close button to quit
  61         self.window = self.mainwindow.get_object("mainwindow")
  62         self.window.connect("delete-event", Gtk.main_quit)
  63         self.window.show_all()
  64
  65         # Get window ID of the viewport widget from the GUI
  66         self.win_id = self.mainwindow.get_object("viewport").get_window().get_xid()
  67
  68
  69     # When we get a message that video is ready to display, set the
  70     # correct window id to hook it to our viewport
  71     def OnSyncElement(self, bus, message):
  72         if message.get_structure().get_name() == "prepare-window-handle":
  73             print("prepare-window-handle")
  74             message.src.set_window_handle(self.win_id)
  75
  76     def OnPlay(self, widget):
  77         print("play")
  78         self.pipeline.set_state(Gst.State.PLAYING)
  79
  80     def OnStop(self, widget):
  81         print("stop")
  82         self.pipeline.set_state(Gst.State.READY)
  83
  84     def OnQuit(self, widget):
  85         print("quit")
  86         Gtk.main_quit()
  87
  88     # Workaround to get Ctrl+C to terminate from command line
  89     # ref: https://bugzilla.gnome.org/show_bug.cgi?id=622084#c12
  90     signal.signal(signal.SIGINT, signal.SIG_DFL)
  91
  92 start = Main()
  93 Gtk.main()