Implementing preload=metadata for video

media/base/pipeline.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.
 
 // The pipeline is the public API clients use for playing back media.  Clients
 // provide a filter collection containing the filters they want the pipeline to
 // use to render media.
 
 #ifndef MEDIA_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include <string>
 
 #include "base/callback.h"
+#include "media/base/filters.h"

[acolwell GONE FROM CHROMIUM, 2011/03/25 04:35:28]

It is unfortunate that we have to expose filters.h here. I'm tempted to suggest
putting the enum declaration in pipeline_status.h . Perhaps we should discuss
this with Ami & Andrew. 

[vrk (LEFT CHROMIUM), 2011/03/25 21:33:32]

OK! For now I've kept it in the same place, but yeah, this should be discussed.

 #include "media/base/pipeline_status.h"
 
 namespace base {
 class TimeDelta;
 }
 
 namespace media {
 
 struct PipelineStatistics {
   PipelineStatistics() :
@@ skipping 92 matching lines @@
   // Gets the current volume setting being used by the audio renderer.  When
   // the pipeline is started, this value will be 1.0f.  Valid values range
   // from 0.0f to 1.0f.
   virtual float GetVolume() const = 0;
 
   // Attempt to set the volume of the audio renderer.  Valid values for volume
   // range from 0.0f (muted) to 1.0f (full volume).  This value affects all
   // channels proportionately for multi-channel audio streams.
   virtual void SetVolume(float volume) = 0;
 
+  // Set the preload value for the pipeline.
+  virtual void SetPreload(Preload preload) = 0;
+
   // Gets the current pipeline time. For a pipeline "time" progresses from 0 to
   // the end of the media.
   virtual base::TimeDelta GetCurrentTime() const = 0;
 
   // Get the approximate amount of playable data buffered so far in micro-
   // seconds.
   virtual base::TimeDelta GetBufferedTime() = 0;
 
   // Get the duration of the media in microseconds.  If the duration has not
   // been determined yet, then returns 0.
@@ skipping 24 matching lines @@
 
  protected:
   // Only allow ourselves to be deleted by reference counting.
   friend class base::RefCountedThreadSafe<Pipeline>;
   virtual ~Pipeline() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_