Support earliest seekable time in WMPI.

media/base/pipeline.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_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 152 matching lines @@
   // channels proportionately for multi-channel audio streams.
   void SetVolume(float volume);
 
   // Returns the current media playback time, which progresses from 0 until
   // GetMediaDuration().
   base::TimeDelta GetMediaTime() const;
 
   // Get approximate time ranges of buffered media.
   Ranges<base::TimeDelta> GetBufferedTimeRanges() const;
 
+  // Get the start time of the media, or zero if not known.
+  base::TimeDelta GetMediaStartTime() const;
+
   // Get the duration of the media in microseconds.  If the duration has not
   // been determined yet, then returns 0.
   base::TimeDelta GetMediaDuration() const;
 
   // Return true if loading progress has been made since the last time this
   // method was called.
   bool DidLoadingProgress();
 
   // Gets the current pipeline statistics.
   PipelineStatistics GetStatistics() const;
@@ skipping 199 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<Pipeline> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Pipeline);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_