--- /dev/null
+#!/usr/bin/env python3
+
+import sys
+
+import gi
+gi.require_version('Gst', '1.0')
+from gi.repository import Gst
+Gst.init(None)
+
+from gi.repository import GObject
+GObject.threads_init()
+
+
+# The following pipeline works
+PIPELINE = """
+videotestsrc pattern=0 ! selector.
+videotestsrc pattern=13 ! selector.
+input-selector name=selector ! autovideosink
+"""
+
+
+class Player:
+ def __init__(self):
+ self.loop = GObject.MainLoop()
+ self.pipeline = Gst.parse_launch(PIPELINE)
+ self.selector = self.pipeline.get_by_name('selector')
+
+ pad = self.selector.get_static_pad("sink_0")
+ self.selector.set_property("active-pad", pad)
+ print("n-pads: %d" % self.selector.get_property("n-pads"))
+
+ bus = self.pipeline.get_bus()
+ bus.add_signal_watch()
+ bus.connect('message::eos', self.on_eos)
+ bus.connect('message::error', self.on_error)
+ bus.connect('message::state-changed', self.on_state_changed)
+
+ def run(self):
+ self.pipeline.set_state(Gst.State.PLAYING)
+ self.loop.run()
+
+ def quit(self):
+ self.pipeline.set_state(Gst.State.NULL)
+ self.loop.quit()
+
+ def switch(self):
+ active_pad = self.selector.get_property("active-pad")
+ if active_pad.get_name() == "sink_0":
+ new_pad = self.selector.get_static_pad("sink_1")
+ else:
+ new_pad = self.selector.get_static_pad("sink_0")
+
+ print("switching from %s to %s" % (active_pad.get_name(),
+ new_pad.get_name()))
+
+ self.selector.set_property("active-pad", new_pad)
+
+ def on_eos(self, bus, msg):
+ self.quit()
+
+ def on_error(self, bus, msg):
+ (err, debug) = msg.parse_error()
+ print("Error: %s" % err)
+ self.quit()
+
+ def on_state_changed(self, bus, msg):
+ if msg.src != self.pipeline:
+ return
+
+ old_state, new_state, pending = msg.parse_state_changed()
+ print("%s from %s to %s" % (msg.src.get_name(), old_state, new_state))
+
+
+def main():
+ player = Player()
+
+ def stdin_cb(source, condition):
+ source.readline()
+ player.switch()
+ return True
+
+ GObject.io_add_watch(sys.stdin, GObject.IO_IN, stdin_cb)
+
+ print("\nPress Enter to switch the source\n")
+ player.run()
+
+
+if __name__ == '__main__':
+ sys.exit(main())