Merge pull request #545 from gesinger/firefox-update-end-on-buffer-removal

Don’t process update end until buffered value has been set

@@ -21,3 +21,4 @@ env:
   - secure: AnduYGXka5ft1x7V3SuVYqvlKLvJGhUaRNFdy4UDJr3ZVuwpQjE4TMDG8REmJIJvXfHbh4qY4N1cFSGnXkZ4bH21Xk0v9DLhsxbarKz+X2BvPgXs+Af9EQ6vLEy/5S1vMLxfT5+y+Ec5bVNGOsdUZby8Y21CRzSg6ADN9kwPGlE=
 addons:
   sauce_connect: true
+  firefox: latest

@@ -1229,13 +1229,20 @@ videojs.HlsHandler.prototype.updateEndHandler_ = function () {
     seekable,
     timelineUpdate;
 
-  this.pendingSegment_ = null;
-
   // stop here if the update errored or was aborted
   if (!segmentInfo) {
     return;
   }
 
+  // In Firefox, the updateend event is triggered for both removing from the buffer and
+  // adding to the buffer. To prevent this code from executing on removals, we wait for
+  // segmentInfo to have a filled in buffered value before we continue processing.
+  if (!segmentInfo.buffered) {
+    return;
+  }
+
+  this.pendingSegment_ = null;
+
   playlist = this.playlists.media();
   segments = playlist.segments;
   currentMediaIndex = segmentInfo.mediaIndex + (segmentInfo.mediaSequence - playlist.mediaSequence);

@@ -2906,6 +2906,40 @@ test('does not download segments if preload option set to none', function() {
   equal(requests.length, 0, 'did not download any segments');
 });
 
+test('does not process update end until buffered value has been set', function() {
+  var drainBufferCallCount = 0, origDrainBuffer;
+
+  player.src({
+    src: 'master.m3u8',
+    type: 'application/vnd.apple.mpegurl'
+  });
+  origDrainBuffer = player.tech_.hls.drainBuffer;
+  player.tech_.hls.drainBuffer = function() {
+    drainBufferCallCount++;
+  };
+
+  openMediaSource(player);
+  standardXHRResponse(requests.shift()); // master
+  standardXHRResponse(requests.shift()); // media
+
+  equal(drainBufferCallCount, 0, 'drainBuffer not called yet');
+
+  standardXHRResponse(requests.shift()); // segment
+
+  ok(player.tech_.hls.pendingSegment_, 'pending segment exists');
+  equal(drainBufferCallCount, 1, 'drainBuffer called');
+
+  player.tech_.hls.sourceBuffer.trigger('updateend');
+  ok(player.tech_.hls.pendingSegment_, 'pending segment exists');
+
+  player.tech_.hls.drainBuffer = origDrainBuffer;
+  player.tech_.hls.drainBuffer();
+  ok(player.tech_.hls.pendingSegment_, 'pending segment exists');
+
+  player.tech_.hls.sourceBuffer.trigger('updateend');
+  ok(!player.tech_.hls.pendingSegment_, 'pending segment cleared out');
+});
+
 module('Buffer Inspection');
 
 test('detects time range end-point changed by updates', function() {