diff -r 000000000000 -r 6474c204b198 content/media/WebVTTListener.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/WebVTTListener.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_WebVTTLoadListener_h
+#define mozilla_dom_WebVTTLoadListener_h
+
+#include "nsIWebVTTListener.h"
+#include "nsIStreamListener.h"
+#include "nsIChannelEventSink.h"
+#include "nsAutoPtr.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsCycleCollectionParticipant.h"
+
+class nsIWebVTTParserWrapper;
+
+namespace mozilla {
+namespace dom {
+
+class HTMLTrackElement;
+
+class WebVTTListener MOZ_FINAL : public nsIWebVTTListener,
+                                 public nsIStreamListener,
+                                 public nsIChannelEventSink,
+                                 public nsIInterfaceRequestor
+{
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_NSIWEBVTTLISTENER
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSISTREAMLISTENER
+  NS_DECL_NSICHANNELEVENTSINK
+  NS_DECL_NSIINTERFACEREQUESTOR
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(WebVTTListener,
+                                           nsIStreamListener)
+
+public:
+  WebVTTListener(HTMLTrackElement* aElement);
+  ~WebVTTListener();
+
+  /**
+   * Loads the WebVTTListener. Must call this in order for the listener to be
+   * ready to parse data that is passed to it.
+   */
+  nsresult LoadResource();
+
+private:
+  // List of error codes returned from the WebVTT parser that we care about.
+  enum ErrorCodes {
+    BadSignature = 0
+  };
+  static NS_METHOD ParseChunk(nsIInputStream* aInStream, void* aClosure,
+                              const char* aFromSegment, uint32_t aToOffset,
+                              uint32_t aCount, uint32_t* aWriteCount);
+
+  nsRefPtr<HTMLTrackElement> mElement;
+  nsCOMPtr<nsIWebVTTParserWrapper> mParserWrapper;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_WebVTTListener_h