wrap state_change_async and show that it works

Original commit message from CVS:
wrap state_change_async and show that it works

ChangeLog

@@ -1,3 +1,9 @@
+2005-09-12  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* gst/gst.defs:
+	* testsuite/test_pipeline.py:
+	  wrap state_change_async and show that it works
+
 2005-09-12  Thomas Vander Stichele  <thomas at apestaart dot org>
 
 	* examples/vumeter.py:

gst/gst.defs

@@ -1055,6 +1055,15 @@
   )
 )
 
+(define-method set_state_async
+  (of-object "GstElement")
+  (c-name "gst_element_set_state_async")
+  (return-type "GstStateChangeReturn")
+  (parameters
+    '("GstState" "state")
+  )
+)
+
 (define-method abort_state
   (of-object "GstElement")
   (c-name "gst_element_abort_state")

testsuite/test_pipeline.py

@@ -24,6 +24,8 @@ import time
 
 from common import gst, unittest
 
+import gobject
+
 class PipelineConstructor(unittest.TestCase):
     def testGoodConstructor(self):
         name = 'test-pipeline'
@@ -52,5 +54,39 @@ class Pipeline(unittest.TestCase):
         self.pipeline.set_state(gst.STATE_NULL)
         self.assertEqual(self.pipeline.get_state(None)[1], gst.STATE_NULL)
 
+class PipelineAndBus(unittest.TestCase):
+    def setUp(self):
+        self.pipeline = gst.Pipeline('test-pipeline')
+        self.pipeline.set_property('play-timeout', 0L)
+        source = gst.element_factory_make('fakesrc', 'source')
+        sink = gst.element_factory_make('fakesink', 'sink')
+        self.pipeline.add_many(source, sink)
+        gst.element_link_many(source, sink)
+
+        self.bus = self.pipeline.get_bus()
+        self.bus.add_watch(self._message_received)
+
+        self.loop = gobject.MainLoop()
+
+    def _message_received(self, bus, message):
+        gst.debug('received message: %s, %s' % (
+            message.src.get_path_string(), message.type.value_nicks[1]))
+        t = message.type
+        if t == gst.MESSAGE_STATE_CHANGED:
+            old, new = message.parse_state_changed()
+            gst.debug('%r state change from %r to %r' % (
+                message.src.get_path_string(), old, new))
+            if message.src == self.pipeline and new == gst.STATE_PLAYING:
+                self.loop.quit()
+
+        return True
+
+    def testPlaying(self):
+        ret = self.pipeline.set_state_async(gst.STATE_PLAYING)
+        self.assertEquals(ret, gst.STATE_CHANGE_ASYNC)
+
+        # go into a main loop to wait for messages
+        self.loop.run()
+        
 if __name__ == "__main__":
     unittest.main()