Bug 1423241 - Implement NotifyPull for MediaStreamTrackListener. r=padenot

Differential Revision: https://phabricator.services.mozilla.com/D12267

--HG--
extra : moz-landing-system : lando

dom/media/MediaStreamGraph.cpp

@@ -2629,6 +2629,21 @@ bool SourceMediaStream::PullNewData(StreamTime aDesiredUpToTime) {
       l->NotifyPull(GraphImpl(), t);
     }
   }
+  for (const TrackData& track : mUpdateTracks) {
+    if (track.mCommands & TrackEventCommand::TRACK_EVENT_ENDED) {
+      continue;
+    }
+    current = track.mEndOfFlushedData + track.mData->GetDuration();
+    if (t <= current) {
+      continue;
+    }
+    MutexAutoUnlock unlock(mMutex);
+    for (TrackBound<MediaStreamTrackListener>& l : mTrackListeners) {
+      if (l.mTrackID == track.mID) {
+        l.mListener->NotifyPull(Graph(), current, t);
+      }
+    }
+  }
   return true;
 }
 

dom/media/MediaStreamGraph.h

@@ -673,7 +673,7 @@ class SourceMediaStream : public MediaStream {
 
   /**
    * Enable or disable pulling. When pulling is enabled, NotifyPull
-   * gets called on MediaStreamListeners for this stream during the
+   * gets called on MediaStream/TrackListeners for this stream during the
    * MediaStreamGraph control loop. Pulling is initially disabled.
    * Due to unavoidable race conditions, after a call to SetPullEnabled(false)
    * it is still possible for a NotifyPull to occur.

dom/media/MediaStreamListener.h

@@ -147,6 +147,10 @@ class MediaStreamTrackListener {
   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaStreamTrackListener)
 
  public:
+  virtual void NotifyPull(MediaStreamGraph* aGraph,
+                          StreamTime aEndOfAppendedData,
+                          StreamTime aDesiredTime) {}
+
   virtual void NotifyQueuedChanges(MediaStreamGraph* aGraph,
                                    StreamTime aTrackOffset,
                                    const MediaSegment& aQueuedMedia) {}