Render inband text tracks in the media pipeline

media/base/demuxer_stream.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_DEMUXER_STREAM_H_
 #define MEDIA_BASE_DEMUXER_STREAM_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 class AudioDecoderConfig;
 class DecoderBuffer;
+class TextTrackConfig;
 class VideoDecoderConfig;
 
 class MEDIA_EXPORT DemuxerStream {
  public:
   enum Type {
     UNKNOWN,
     AUDIO,
     VIDEO,
+    TEXT,
     NUM_TYPES,  // Always keep this entry as the last one!
   };
 
   // Status returned in the Read() callback.
   //  kOk : Indicates the second parameter is Non-NULL and contains media data
   //        or the end of the stream.
   //  kAborted : Indicates an aborted Read(). This can happen if the
   //             DemuxerStream gets flushed and doesn't have any more data to
   //             return. The second parameter MUST be NULL when this status is
   //             returned.
@@ skipping 21 matching lines @@
   virtual void Read(const ReadCB& read_cb) = 0;
 
   // Returns the audio decoder configuration. It is an error to call this method
   // if type() != AUDIO.
   virtual AudioDecoderConfig audio_decoder_config() = 0;
 
   // Returns the video decoder configuration. It is an error to call this method
   // if type() != VIDEO.
   virtual VideoDecoderConfig video_decoder_config() = 0;
 
+  // Returns the text track configuration.  It is an error to call this method
+  // if type() != TEXT.
+  virtual TextTrackConfig text_track_config() = 0;

[acolwell GONE FROM CHROMIUM, 2013/10/21 20:10:40]

nit: Is this really needed on the DemuxerStream interface? I don't see anything
outside of ChunkDemuxer needing it.

[Matthew Heaney (Chromium), 2013/10/23 05:09:01]

Done.

+
   // Returns the type of stream.
   virtual Type type() = 0;
 
   virtual void EnableBitstreamConverter() = 0;
 
  protected:
   // Only allow concrete implementations to get deleted.
   virtual ~DemuxerStream();
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DEMUXER_STREAM_H_