Keep AudioScheduledSourceNode alive until onended is called.

Source/modules/webaudio/AudioScheduledSourceNode.cpp

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
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  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 161 matching lines @@
 
 void AudioScheduledSourceNode::finish()
 {
     if (m_playbackState != FINISHED_STATE) {
         // Let the context dereference this AudioNode.
         context()->notifyNodeFinishedProcessing(this);
         m_playbackState = FINISHED_STATE;
         context()->decrementActiveSourceCount();
     }
 
-    if (m_hasEndedListener)
+    if (m_hasEndedListener) {
+        // Reference ourself so we don't accidentally get deleted before notifyEnded gets called.
+        ref();

[haraken, 2013/09/05 23:42:44]

You can just set m_playing to true, and...

         callOnMainThread(&AudioScheduledSourceNode::notifyEndedDispatch, this);
+    }
 }
 
 void AudioScheduledSourceNode::notifyEndedDispatch(void* userData)
 {
     static_cast<AudioScheduledSourceNode*>(userData)->notifyEnded();
 }
 
 void AudioScheduledSourceNode::notifyEnded()
 {
-    RefPtr<Event> event = Event::create(eventNames().endedEvent);
-    event->setTarget(this);
-    dispatchEvent(event.get());
+    // Avoid firing the event if the document has already gone away.
+    if (context()->scriptExecutionContext()) {
+        RefPtr<Event> event = Event::create(eventNames().endedEvent);
+        event->setTarget(this);
+        dispatchEvent(event.get());
+    }
+
+    // Deref to match the ref() call in finish();
+    deref();

[haraken, 2013/09/05 23:42:44]

... set m_playing to false here.

Then you can implement hasPendingActivity() { return m_playing; }

Doesn't it work?

 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)