python/gst-trick-mode-looping-3.py

   1 #!/usr/bin/env python
   2
   3 # Get a test sample with:
   4 # youtube-dl -t http://www.youtube.com/watch?v=yWa-YXiSk2Y
   5
   6 import sys
   7
   8 import gobject
   9 gobject.threads_init()
  10
  11 import gst
  12
  13
  14 class Player:
  15     def __init__(self, filename, rate):
  16         self._filename = filename
  17         self._rate = rate
  18
  19         self._player = gst.element_factory_make("playbin2", "player")
  20         self._player.set_property("uri", filename)
  21
  22         bus = self._player.get_bus()
  23         bus.add_signal_watch()
  24         bus.connect('message::state-changed', self.on_state_changed)
  25         bus.connect('message::segment-done', self.on_segment_done)
  26
  27     def run(self):
  28         self._player.set_state(gst.STATE_PLAYING)
  29         loop = gobject.MainLoop()
  30         loop.run()
  31
  32     def on_segment_done(self, bus, msg):
  33         self._player.seek(self._rate, gst.FORMAT_TIME,
  34                 gst.SEEK_FLAG_SEGMENT | gst.SEEK_FLAG_SKIP | gst.SEEK_FLAG_ACCURATE,
  35                 gst.SEEK_TYPE_SET, 0,
  36                 gst.SEEK_TYPE_END, 0)
  37
  38     def on_state_changed(self, bus, msg):
  39         if msg.src != self._player:
  40             return
  41
  42         print 'on_state_changed'
  43         old_state, new_state, pending = msg.parse_state_changed()
  44         print "%s -> %s" % (old_state, new_state)
  45         if old_state == gst.STATE_READY and new_state == gst.STATE_PAUSED:
  46             self.set_rate(self._rate)
  47
  48     def set_rate(self, rate):
  49         self._rate = rate
  50
  51         if rate == 0:
  52             self._player.set_state(gst.STATE_PAUSED)
  53         else:
  54             self._player.set_state(gst.STATE_PLAYING)
  55             self._player.seek(self._rate, gst.FORMAT_TIME,
  56                     gst.SEEK_FLAG_SEGMENT | gst.SEEK_FLAG_SKIP | gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE,
  57                     gst.SEEK_TYPE_SET, 0,
  58                     gst.SEEK_TYPE_END, 0)
  59
  60
  61 def main(args):
  62     def usage():
  63         sys.stdout.write("usage: %s <URI-OF-MEDIA-FILE>\n" % args[0])
  64
  65     if len(args) != 2:
  66         usage()
  67         sys.exit(1)
  68
  69     if not gst.uri_is_valid(args[1]):
  70         sys.stderr.write("Error: Invalid URI: %s\n" % args[1])
  71         sys.exit(1)
  72
  73     player = Player(args[1], 3.0)
  74     player.run()
  75
  76 if __name__ == '__main__':
  77     sys.exit(main(sys.argv))