git.slaskete.net - python-gstreamer-examples/blob - example2+3.py

   1 #!/usr/bin/env python
   2 # Let's see if we can get a viewport AND audio working, combining ex. 2 and 3
   3
   4 # GdkX11 to get access to xid, GstVideo to get access to set_window_handle
   5 import gi, signal
   6 gi.require_version('Gtk', '3.0')
   7 gi.require_version('Gst', '1.0')
   8 gi.require_version('GstVideo', '1.0')
   9 from gi.repository import Gtk, Gst, GdkX11, GstVideo
  10
  11 class Main:
  12     def __init__(self):
  13
  14         # Create gui bits and bobs
  15
  16         self.mainwindow = Gtk.Builder()
  17         self.mainwindow.add_from_file("example3.glade")
  18
  19         signals = {
  20             "on_play_clicked" : self.OnPlay,
  21             "on_stop_clicked" : self.OnStop,
  22             "on_quit_clicked" : self.OnQuit,
  23         }
  24
  25         self.mainwindow.connect_signals(signals)
  26
  27         # Create GStreamer bits and bobs
  28
  29         # Initiate the pipeline
  30         Gst.init(None)
  31         self.pipeline = Gst.Pipeline()
  32
  33         # Add a videotestsrc element to the pipeline, set it to pattern "snow."
  34         self.videotestsrc = Gst.ElementFactory.make("videotestsrc", "videosource")
  35         self.videotestsrc.set_property("pattern", "snow")
  36         self.pipeline.add(self.videotestsrc)
  37
  38         # Add a capsfilter that we want to apply to our videotestsrc
  39         self.videotestcaps = Gst.ElementFactory.make("capsfilter", "videotestcaps")
  40         self.videotestcaps.set_property("caps",Gst.Caps.from_string("video/x-raw,width=640,height=480"))
  41         self.pipeline.add(self.videotestcaps)
  42
  43         # Link the capsfilter to the videotestsrc
  44         self.videotestsrc.link(self.videotestcaps)
  45
  46         # Add a videosink element to the pipeline
  47         self.videosink = Gst.ElementFactory.make("autovideosink", "videosink")
  48         self.pipeline.add(self.videosink)
  49
  50         # Link the already linked videotestcaps to the sink
  51         self.videotestcaps.link(self.videosink)
  52
  53         # Add an audiotestsrc element to the pipeline
  54         self.audiotestsrc = Gst.ElementFactory.make("audiotestsrc", "audio")
  55         self.audiotestsrc.set_property("freq", 800)
  56         self.pipeline.add(self.audiotestsrc)
  57
  58         # Add a pulsesink element to the pipeline
  59         self.pulsesink = Gst.ElementFactory.make("pulsesink", "sink")
  60         self.pipeline.add(self.pulsesink)
  61
  62         # Link the two elements together
  63         self.audiotestsrc.link(self.pulsesink)
  64
  65         # Set up a bus to our pipeline to get notified when the video is ready
  66         self.bus = self.pipeline.get_bus()
  67         self.bus.enable_sync_message_emission()
  68         self.bus.connect("sync-message::element", self.OnSyncElement)
  69
  70         # Summon the window and connect the window's close button to quit
  71         self.window = self.mainwindow.get_object("mainwindow")
  72         self.window.connect("delete-event", Gtk.main_quit)
  73         self.window.show_all()
  74
  75         # Get window ID of the viewport widget from the GUI
  76         self.win_id = self.mainwindow.get_object("viewport").get_window().get_xid()
  77
  78
  79     # When we get a message that video is ready to display, set the
  80     # correct window id to hook it to our viewport
  81     def OnSyncElement(self, bus, message):
  82         if message.get_structure().get_name() == "prepare-window-handle":
  83             print("prepare-window-handle")
  84             message.src.set_window_handle(self.win_id)
  85
  86     def OnPlay(self, widget):
  87         print("play")
  88         self.pipeline.set_state(Gst.State.PLAYING)
  89
  90     def OnStop(self, widget):
  91         print("stop")
  92         self.pipeline.set_state(Gst.State.READY)
  93
  94     def OnQuit(self, widget):
  95         print("quit")
  96         Gtk.main_quit()
  97
  98     # Workaround to get Ctrl+C to terminate from command line
  99     # ref: https://bugzilla.gnome.org/show_bug.cgi?id=622084#c12
 100     signal.signal(signal.SIGINT, signal.SIG_DFL)
 101
 102 start = Main()
 103 Gtk.main()