Fire CanPlayThrough immediately for local and streaming media files

media/base/demuxer.h

 // Copyright (c) 2011 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 "base/memory/ref_counted.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_export.h"
@@ skipping 43 matching lines @@
   // Alert the Demuxer that the video preload value has been changed.
   virtual void SetPreload(Preload preload) = 0;
 
   // Returns the starting time for the media file.
   virtual base::TimeDelta GetStartTime() const = 0;
 
   // Returns the content bitrate. May be obtained from container or
   // approximated. Returns 0 if it is unknown.
   virtual int GetBitrate() = 0;
 
+  // Returns true if the source is from a local file or stream (such as a
+  // webcam stream), false otherwise.
+  virtual bool IsLocalSource() = 0;
+
+  // Returns true if seeking is possible; false otherwise.
+  virtual bool IsSeekable() = 0;
+
  protected:
   Demuxer();
   FilterHost* host() { return host_; }
 
   friend class base::RefCountedThreadSafe<Demuxer>;
   virtual ~Demuxer();
 
  private:
   FilterHost* host_;
 
   DISALLOW_COPY_AND_ASSIGN(Demuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DEMUXER_H_