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 from gi.repository import Gtk, Gst
  10 import signal
  11
  12 class Main:
  13     def __init__(self):
  14
  15         # Create gui bits and bobs
  16
  17         self.wTree = Gtk.Builder()
  18         self.wTree.add_from_file("example2.glade")
  19
  20         signals = {
  21             "on_play_clicked" : self.OnPlay,
  22             "on_stop_clicked" : self.OnStop,
  23             "on_quit_clicked" : self.OnQuit,
  24         }
  25
  26         self.wTree.connect_signals(signals)
  27
  28         # Create GStreamer bits and bobs
  29
  30         # Initiate the pipeline
  31         Gst.init(None)
  32         self.pipeline = Gst.Pipeline("mypipeline")
  33
  34         # Add an audiotestsrc element to the pipeline
  35         self.audiotestsrc = Gst.ElementFactory.make("audiotestsrc", "audio")
  36         self.audiotestsrc.set_property("freq", 200)
  37         self.pipeline.add(self.audiotestsrc)
  38
  39         # Add a pulsesink element to the pipeline
  40         self.pulsesink = Gst.ElementFactory.make("pulsesink", "sink")
  41         self.pipeline.add(self.pulsesink)
  42
  43         # Link the two elements together
  44         self.audiotestsrc.link(self.pulsesink)
  45
  46         # Summon the window and connect the window's close button to Quit
  47         self.window = self.wTree.get_object("mainwindow")
  48         self.window.connect("delete-event", Gtk.main_quit)
  49         self.window.show_all()
  50
  51
  52     def OnPlay(self, widget):
  53         print "play"
  54         self.pipeline.set_state(Gst.State.PLAYING)
  55
  56     def OnStop(self, widget):
  57         print "stop"
  58         self.pipeline.set_state(Gst.State.READY)
  59
  60     def OnQuit(self, widget):
  61         print "quit"
  62         Gtk.main_quit()
  63
  64     # Workaround to get Ctrl+C to terminate from command line
  65     # ref: https://bugzilla.gnome.org/show_bug.cgi?id=622084#c12
  66     signal.signal(signal.SIGINT, signal.SIG_DFL)
  67
  68 start = Main()
  69 Gtk.main()