Have play call StartObserver.soundStarted with a null sound when the

sound fails to play for any reason.  We use the StartObserver to time 
other effects with sounds, however if the sound isn't going to play, we 
still want the other effects to go ahead.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4203 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/openal/Sound.java

@@ -36,7 +36,10 @@ public class Sound
      * delayed in loading. */
     public interface StartObserver
     {
-        /** Called when the specified sound has started playing. */
+        /** Called when the specified sound has started playing.  If 
+         * sound is null then the sound failed to play but soundStarted
+         * was called anyway to perform whatever actions were waiting
+         * on the sound. */
         public void soundStarted (Sound sound);
     }
 
@@ -181,6 +184,9 @@ public class Sound
     {
         // if we were unable to get our buffer, fail immediately
         if (_buffer == null) {
+            if (obs != null) {
+                obs.soundStarted(null);
+            }
             return false;
         }
 
@@ -204,6 +210,9 @@ public class Sound
                 return true;
             } else {
                 // sorry charlie...
+                if (obs != null) {
+                    obs.soundStarted(null);
+                }
                 return false;
             }
         }