Add live mode detection in WebM MediaSource parser.

media/base/demuxer.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_H_
 #define MEDIA_BASE_DEMUXER_H_
 
 #include <vector>
 
 #include "base/time/time.h"
@@ skipping 26 matching lines @@
 
   // Remove |text_stream| from the presentation.
   virtual void RemoveTextStream(DemuxerStream* text_stream) = 0;
 
  protected:
   virtual ~DemuxerHost();
 };
 
 class MEDIA_EXPORT Demuxer {
  public:
+  enum Liveness {
+    LIVENESS_UNKNOWN,
+    LIVENESS_RECORDED,
+    LIVENESS_LIVE,
+  };
+
   // A new potentially encrypted stream has been parsed.
   // First parameter - The type of initialization data.
   // Second parameter - The initialization data associated with the stream.
   typedef base::Callback<void(const std::string& type,
                               const std::vector<uint8>& init_data)> NeedKeyCB;
 
   Demuxer();
   virtual ~Demuxer();
 
   // Completes initialization of the demuxer.
@@ skipping 28 matching lines @@
   virtual DemuxerStream* GetStream(DemuxerStream::Type type) = 0;
 
   // Returns the starting time for the media file.
   virtual base::TimeDelta GetStartTime() const = 0;
 
   // Returns Time represented by presentation timestamp 0.
   // If the timstamps are not associated with a Time, then
   // a null Time is returned.
   virtual base::Time GetTimelineOffset() const = 0;
 
+  // Returns liveness of the stream, i.e. whether it is recorded or live.
+  virtual Liveness GetLiveness() const = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(Demuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DEMUXER_H_