Media Source dispatches inband text tracks

media/base/text_track.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_BASE_TEXT_TRACK_H_
+#define MEDIA_BASE_TEXT_TRACK_H_
+
+#include <string>
+
+// TODO(matthewjheaney): see note below
+//#include "base/memory/scoped_ptr.h"
+#include "base/callback.h"
+#include "base/time.h"
+
+namespace media {
+
+// Specifies the varieties of text tracks.
+enum TextKind {
+  kTextSubtitles,
+  kTextCaptions,
+  kTextDescriptions,
+  kTextMetadata,
+  kTextNone
+};
+
+class TextTrack {
+ public:
+  virtual ~TextTrack() {}
+  virtual void addWebVTTCue(const base::TimeDelta& start,
+                            const base::TimeDelta& end,
+                            const std::string& id,
+                            const std::string& content,
+                            const std::string& settings) = 0;
+};
+
+// TODO(matthewjheaney): need ruling from Aaron about
+// return type: scoped_ptr or scoped_refptr?
+// I think it's the case that scoped_refptr requires that
+// the type also derive from refcounted.
+// Does that imply that TextTrack derives from refcounted?
+// Or does that happened somewhere else in the hierarchy?
+typedef base::Callback<TextTrack*(TextKind kind,

[acolwell GONE FROM CHROMIUM, 2013/05/10 02:22:08]

A scoped_ptr should be used since I don't believe we need ref counting.

[Matthew Heaney (Chromium), 2013/05/10 05:21:08]

Done.

+                                  const std::string& label,
+                                  const std::string& language)> AddTextTrackCB;
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_TEXT_TRACK_H_