Media Source dispatches inband text tracks

media/base/pipeline_status.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_PIPELINE_STATUS_H_
 #define MEDIA_BASE_PIPELINE_STATUS_H_
 
 #include "base/callback.h"
 
 #include <string>
@@ skipping 42 matching lines @@
 
   uint32 audio_bytes_decoded;  // Should be uint64?
   uint32 video_bytes_decoded;  // Should be uint64?
   uint32 video_frames_decoded;
   uint32 video_frames_dropped;
 };
 
 // Used for updating pipeline statistics.
 typedef base::Callback<void(const PipelineStatistics&)> StatisticsCB;
 
+// Specifies the varieties of text tracks.
+enum TextKind {
+  kTextSubtitles,
+  kTextCaptions,
+  kTextDescriptions,
+  kTextMetadata,
+  kTextNone
+};
+
+// So pipeline can notify media player about presence of text tracks.
+// TODO(matthewjheaney): Might have to also include track number, etc.
+typedef base::Callback<void(TextKind kind,
+                            const std::string& label,
+                            const std::string& language)> TextTrackCB;
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_STATUS_H_