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

   1 #!/usr/bin/env python
   2 # This is a reworked version of the example from Jono Bacon's Python+Gstreamer primer:
   3 # http://www.jonobacon.org/2006/08/28/getting-started-with-gstreamer-with-python/
   4 #
   5 # It uses Gstreamer 1.0, GTK3, and replaces alsa with pulse for audio output
   6 # Info on porting python scripts to GStreamer 1.0 can be found here:
   7 # https://wiki.ubuntu.com/Novacut/GStreamer1.0
   8
   9 import gi
  10 gi.require_version('Gtk', '3.0')
  11 gi.require_version('Gst', '1.0')
  12 from gi.repository import Gtk, Gst
  13 import signal
  14
  15 class Main:
  16     def __init__(self):
  17
  18         # Create gui bits and bobs
  19
  20         self.wTree = Gtk.Builder()
  21         self.wTree.add_from_file("example2.glade")
  22
  23         signals = {
  24             "on_play_clicked" : self.OnPlay,
  25             "on_stop_clicked" : self.OnStop,
  26             "on_quit_clicked" : self.OnQuit,
  27         }
  28
  29         self.wTree.connect_signals(signals)
  30
  31         # Create GStreamer bits and bobs
  32
  33         # Initiate the pipeline
  34         Gst.init(None)
  35         self.pipeline = Gst.Pipeline()
  36
  37         # Add an audiotestsrc element to the pipeline
  38         self.audiotestsrc = Gst.ElementFactory.make("audiotestsrc", "audio")
  39         self.audiotestsrc.set_property("freq", 800)
  40         self.pipeline.add(self.audiotestsrc)
  41
  42         # Add a pulsesink element to the pipeline
  43         self.pulsesink = Gst.ElementFactory.make("pulsesink", "sink")
  44         self.pipeline.add(self.pulsesink)
  45
  46         # Link the two elements together
  47         self.audiotestsrc.link(self.pulsesink)
  48
  49         # Summon the window and connect the window's close button to Quit
  50         self.window = self.wTree.get_object("mainwindow")
  51         self.window.connect("delete-event", Gtk.main_quit)
  52         self.window.show_all()
  53
  54
  55     def OnPlay(self, widget):
  56         print("play")
  57         self.pipeline.set_state(Gst.State.PLAYING)
  58
  59     def OnStop(self, widget):
  60         print("stop")
  61         self.pipeline.set_state(Gst.State.READY)
  62
  63     def OnQuit(self, widget):
  64         print("quit")
  65         Gtk.main_quit()
  66
  67     # Workaround to get Ctrl+C to terminate from command line
  68     # ref: https://bugzilla.gnome.org/show_bug.cgi?id=622084#c12
  69     signal.signal(signal.SIGINT, signal.SIG_DFL)
  70
  71 start = Main()
  72 Gtk.main()