Bug 693391 - Pin nsMediaStream while determining buffered ranges. r=roc

content/media/nsBuiltinDecoderStateMachine.cpp

@@ -1668,3 +1668,12 @@ void nsBuiltinDecoderStateMachine::StartBuffering()
     stats.mPlaybackRate/1024, stats.mPlaybackRateReliable ? "" : " (unreliable)",
     stats.mDownloadRate/1024, stats.mDownloadRateReliable ? "" : " (unreliable)"));
 }
+
+nsresult nsBuiltinDecoderStateMachine::GetBuffered(nsTimeRanges* aBuffered) {
+  nsMediaStream* stream = mDecoder->GetCurrentStream();
+  NS_ENSURE_TRUE(stream, NS_ERROR_FAILURE);
+  stream->Pin();
+  nsresult res = mReader->GetBuffered(aBuffered, mStartTime);
+  stream->Unpin();
+  return res;
+}

content/media/nsBuiltinDecoderStateMachine.h

@@ -235,9 +235,7 @@ public:
   // Accessed on state machine, audio, main, and AV thread. 
   State mState;
 
-  nsresult GetBuffered(nsTimeRanges* aBuffered) {
-    return mReader->GetBuffered(aBuffered, mStartTime);
-  }
+  nsresult GetBuffered(nsTimeRanges* aBuffered);
 
   void NotifyDataArrived(const char* aBuffer, PRUint32 aLength, PRUint32 aOffset) {
     NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");