Fix 'not-negotiated' errors on some Spotify tracks (fixes #213)

docs/changes.rst

@@ -5,6 +5,16 @@ Changes
 This change log is used to track all major changes to Mopidy.
 
 
+v0.8.1 (in development)
+=======================
+
+**Bug fixes**
+
+- :issue:`213`: Fix "streaming task paused, reason not-negotiated" errors
+  observed by some users on some Spotify tracks due to a change introduced in
+  0.8.0. See the issue for a patch that applies to 0.8.0.
+
+
 v0.8.0 (2012-09-20)
 ===================
 

mopidy/audio/__init__.py

@@ -70,6 +70,21 @@ class Audio(ThreadingActor):
         fakesink = gst.element_factory_make('fakesink')
         self._playbin.set_property('video-sink', fakesink)
 
+        self._playbin.connect('notify::source', self._on_new_source)
+
+    def _on_new_source(self, element, pad):
+        uri = element.get_property('uri')
+        if not uri or not uri.startswith('appsrc://'):
+            return
+
+        # These caps matches the audio data provided by libspotify
+        default_caps = gst.Caps(
+            'audio/x-raw-int, endianness=(int)1234, channels=(int)2, '
+            'width=(int)16, depth=(int)16, signed=(boolean)true, '
+            'rate=(int)44100')
+        source = element.get_property('source')
+        source.set_property('caps', default_caps)
+
     def _teardown_playbin(self):
         self._playbin.set_state(gst.STATE_NULL)