Bug 881959 - Tell the MediaStreamGraph when changes to the graph occur. r=roc

--HG--
extra : rebase_source : f5c0021e35fa0b66cc45434b5d23742ff3cc3019

content/media/MediaStreamGraph.cpp

@@ -2317,6 +2317,7 @@ MediaStreamGraphImpl::MediaStreamGraphImpl(bool aRealtime)
   , mPostedRunInStableState(false)
   , mRealtime(aRealtime)
   , mNonRealtimeProcessing(false)
+  , mStreamOrderDirty(false)
 {
 #ifdef PR_LOGGING
   if (!gMediaStreamGraphLog) {
@@ -2470,4 +2471,11 @@ MediaStreamGraph::StartNonRealtimeProcessing(uint32_t aTicksToProcess)
   graph->EnsureRunInStableState();
 }
 
+void
+ProcessedMediaStream::AddInput(MediaInputPort* aPort)
+{
+  mInputs.AppendElement(aPort);
+  GraphImpl()->SetStreamOrderDirty();
+}
+
 }

content/media/MediaStreamGraph.h

@@ -917,10 +917,7 @@ public:
   friend class MediaStreamGraphImpl;
 
   // Do not call these from outside MediaStreamGraph.cpp!
-  virtual void AddInput(MediaInputPort* aPort)
-  {
-    mInputs.AppendElement(aPort);
-  }
+  virtual void AddInput(MediaInputPort* aPort);
   virtual void RemoveInput(MediaInputPort* aPort)
   {
     mInputs.RemoveElement(aPort);

content/media/MediaStreamGraphImpl.h

@@ -365,6 +365,13 @@ public:
    * Remove aPort from the graph and release it.
    */
   void DestroyPort(MediaInputPort* aPort);
+  /**
+   * Mark the media stream order as dirty.
+   */
+  void SetStreamOrderDirty()
+  {
+    mStreamOrderDirty = true;
+  }
 
   // Data members
 
@@ -554,6 +561,11 @@ public:
    * value is only accessed on the main thread.
    */
   bool mNonRealtimeProcessing;
+  /**
+   * True when a change has happened which requires us to recompute the stream
+   * blocking order.
+   */
+  bool mStreamOrderDirty;
 };
 
 }