3 # A simple "trick-mode" player to play a file at a given speed rate.
5 # Get a test sample with:
6 # youtube-dl -t http://www.youtube.com/watch?v=yWa-YXiSk2Y
11 gi.require_version('Gst', '1.0')
12 from gi.repository import Gst
15 from gi.repository import GObject
16 GObject.threads_init()
20 def __init__(self, filename, rate):
21 self._filename = filename
24 self._player = Gst.ElementFactory.make("playbin", "player")
25 self._player.set_property("uri", filename)
27 bus = self._player.get_bus()
28 bus.add_signal_watch()
29 bus.connect('message::state-changed', self.on_state_changed)
32 self._player.set_state(Gst.State.PLAYING)
33 loop = GObject.MainLoop()
36 def on_state_changed(self, bus, msg):
37 if msg.src != self._player:
40 print 'on_state_changed'
41 old_state, new_state, pending = msg.parse_state_changed()
42 print "%s -> %s" % (old_state, new_state)
43 if old_state == Gst.State.READY and new_state == Gst.State.PAUSED:
44 self.set_rate(self._rate)
46 def set_rate(self, rate):
49 position, fmt = self._player.query_position(Gst.Format.TIME)
53 # Create the seek event
55 seek_event = Gst.Event.new_seek(rate,
57 Gst.SeekFlags.FLUSH | Gst.SeekFlags.ACCURATE,
58 Gst.SeekType.SET, position,
61 seek_event = Gst.Event.new_seek(rate,
63 Gst.SeekFlags.FLUSH | Gst.SeekFlags.ACCURATE,
65 Gst.SeekType.SET, position)
68 self._player.send_event(seek_event)
69 Gst.info("rate set to %s" % rate)
71 Gst.warining("change rate failed")
76 sys.stdout.write("usage: %s <URI-OF-MEDIA-FILE>\n" % args[0])
82 if not Gst.uri_is_valid(args[1]):
83 sys.stderr.write("Error: Invalid URI: %s\n" % args[1])
86 player = Player(args[1], 3.0)
89 if __name__ == '__main__':
90 sys.exit(main(sys.argv))