Implementation of Pipeline and FilterHost interfaces. This is a large change...

media/base/filter_host.h

 // Copyright (c) 2006-2008 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.
 
 // FilterHost describes an interface for individual filters to access and
 // modify global playback information.  Every filter is given a filter host
 // reference as part of initialization.
 //
 // This interface is intentionally verbose to cover the needs for the different
 // types of filters (see media/base/filters.h for filter definitionss).  Filters
@@ skipping 25 matching lines @@
   // it is acceptable for filters to use the returned pointer until their
   // Stop method has been called.
   virtual const PipelineStatus* GetPipelineStatus() const = 0;
 
   // Registers a callback to receive global clock update notifications.  The
   // callback will be called repeatedly and filters do not need to re-register
   // after each invocation of the callback.  To remove the callback, filters
   // may call this method passing NULL for the callback argument.
   //
   // Callback arguments:
-  //   int64    the new pipeline time, in microseconds
-  virtual void SetTimeUpdateCallback(Callback1<int64>::Type* callback) = 0;
+  //   base::TimeDelta - the new pipeline time, in microseconds.
+  virtual void SetTimeUpdateCallback(Callback1<base::TimeDelta>::Type* cb) = 0;
 
   // Filters must call this method to indicate that their initialization is
   // complete.  They may call this from within their Initialize() method or may
   // choose call it after processing some data.
   virtual void InitializationComplete() = 0;
 
   // Posts a task to be executed asynchronously on the pipeline's thread.
   virtual void PostTask(Task* task) = 0;
 
   // Stops execution of the pipeline due to a fatal error.
   virtual void Error(PipelineError error) = 0;
 
   // Sets the current time.  Any filters that have registered a callback through
   // the SetTimeUpdateCallback method will be notified of the change.
-  virtual void SetTime(int64 time) = 0;
+  virtual void SetTime(base::TimeDelta time) = 0;
 
   // Get the duration of the media in microseconds.  If the duration has not
   // been determined yet, then returns 0.
-  virtual void SetDuration(int64 duration) = 0;
+  virtual void SetDuration(base::TimeDelta duration) = 0;
 
   // Set the approximate amount of playable data buffered so far in micro-
   // seconds.
-  virtual void SetBufferedTime(int64 buffered_time) = 0;
+  virtual void SetBufferedTime(base::TimeDelta buffered_time) = 0;
 
   // Set the total size of the media file.
   virtual void SetTotalBytes(int64 total_bytes) = 0;
 
   // Sets the total number of bytes that are buffered on the client and ready to
   // be played.
   virtual void SetBufferedBytes(int64 buffered_bytes) = 0;
 
   // Sets the size of the video output in pixel units.
   virtual void SetVideoSize(size_t width, size_t height) = 0;
 
  protected:
-  virtual ~FilterHost() = 0;
+  virtual ~FilterHost() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTER_HOST_H_