python/gst-looping-video-1.py

   1 #!/usr/bin/env python3
   2 #
   3 # A simple looping player.
   4 # Version 1, based on EOS handling.
   5 #
   6 # Get a test sample with:
   7 # youtube-dl -t http://www.youtube.com/watch?v=yWa-YXiSk2Y
   8
   9 import sys
  10
  11 import gi
  12 gi.require_version('Gst', '1.0')
  13 from gi.repository import Gst
  14 Gst.init(None)
  15
  16 from gi.repository import GLib
  17
  18
  19 class Player:
  20     def __init__(self, uri):
  21         self._player = Gst.ElementFactory.make("playbin", "player")
  22         self._player.set_property("uri", uri)
  23
  24         bus = self._player.get_bus()
  25         bus.add_signal_watch()
  26         bus.connect('message::eos', self.on_eos)
  27         bus.connect('message::error', self.on_error)
  28
  29     def run(self):
  30         self._player.set_state(Gst.State.PLAYING)
  31         self.loop = GLib.MainLoop()
  32         self.loop.run()
  33
  34     def quit(self):
  35         self._player.set_state(Gst.State.NULL)
  36         self.loop.quit()
  37
  38     def on_eos(self, bus, msg):
  39         sys.stderr.write(".")
  40         self._player.seek_simple(Gst.Format.TIME, Gst.SeekFlags.FLUSH, 0)
  41
  42     def on_error(self, bus, msg):
  43         (err, debug) = msg.parse_error()
  44         print("Error: %s" % err, debug)
  45         self.quit()
  46
  47
  48 def main(args):
  49     def usage():
  50         sys.stdout.write("usage: %s <filename>\n" % args[0])
  51
  52     if len(args) != 2:
  53         usage()
  54         sys.exit(1)
  55
  56     uri = Gst.filename_to_uri(args[1])
  57
  58     player = Player(uri)
  59     player.run()
  60
  61 if __name__ == '__main__':
  62     sys.exit(main(sys.argv))