Suppress slider thumb jumping around during seeking...

media/base/buffers.h

 // Copyright (c) 2008-2009 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.
 
 // Defines various types of timestamped media buffers used for transporting
 // data between filters.  Every buffer contains a timestamp in microseconds
 // describing the relative position of the buffer within the media stream, and
 // the duration in microseconds for the length of time the buffer will be
 // rendered.
 //
@@ skipping 17 matching lines @@
 #define MEDIA_BASE_BUFFERS_H_
 
 #include "base/logging.h"
 #include "base/ref_counted.h"
 #include "base/time.h"
 
 namespace media {
 
 class StreamSample : public base::RefCountedThreadSafe<StreamSample> {
  public:
+  // Constant timestamp value to indicate an invalid or missing timestamp.
+  static const base::TimeDelta kInvalidTimestamp;
+
   // Returns the timestamp of this buffer in microseconds.
   base::TimeDelta GetTimestamp() const {
     return timestamp_;
   }
 
   // Returns the duration of this buffer in microseconds.
   base::TimeDelta GetDuration() const {
     return duration_;
   }
 
@@ skipping 123 matching lines @@
   // Unlocks the underlying surface, the VideoSurface acquired from Lock is no
   // longer guaranteed to be valid.
   virtual void Unlock() = 0;
 
   virtual bool IsEndOfStream() const = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_BUFFERS_H_