Revert of Remove media::VideoRenderer::SetPlaybackRate().

media/filters/video_renderer_impl.h

 // Copyright 2013 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_FILTERS_VIDEO_RENDERER_IMPL_H_
 #define MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_
 
 #include <deque>
 
 #include "base/memory/ref_counted.h"
@@ skipping 51 matching lines @@
                           const StatisticsCB& statistics_cb,
                           const TimeCB& max_time_cb,
                           const BufferingStateCB& buffering_state_cb,
                           const base::Closure& ended_cb,
                           const PipelineStatusCB& error_cb,
                           const TimeDeltaCB& get_time_cb,
                           const TimeDeltaCB& get_duration_cb) OVERRIDE;
   virtual void Flush(const base::Closure& callback) OVERRIDE;
   virtual void StartPlayingFrom(base::TimeDelta timestamp) OVERRIDE;
   virtual void Stop(const base::Closure& callback) OVERRIDE;
+  virtual void SetPlaybackRate(float playback_rate) OVERRIDE;
 
   // PlatformThread::Delegate implementation.
   virtual void ThreadMain() OVERRIDE;
 
  private:
   // Callback for |video_frame_stream_| initialization.
   void OnVideoFrameStreamInitialized(bool success);
 
   // Callback for |video_frame_stream_| to deliver decoded video frames and
   // report video decoding status.
   void FrameReady(VideoFrameStream::Status status,
                   const scoped_refptr<VideoFrame>& frame);
 
   // Helper method for adding a frame to |ready_frames_|.
   void AddReadyFrame_Locked(const scoped_refptr<VideoFrame>& frame);
 
   // Helper method that schedules an asynchronous read from the
   // |video_frame_stream_| as long as there isn't a pending read and we have
   // capacity.
   void AttemptRead();
   void AttemptRead_Locked();
 
   // Called when VideoFrameStream::Reset() completes.
   void OnVideoFrameStreamResetDone();
 
+  // Calculates the duration to sleep for based on |last_timestamp_|,
+  // the next frame timestamp (may be NULL), and the provided playback rate.
+  //
+  // We don't use |playback_rate_| to avoid locking.
+  base::TimeDelta CalculateSleepDuration(
+      const scoped_refptr<VideoFrame>& next_frame,
+      float playback_rate);
+
   // Helper function that flushes the buffers when a Stop() or error occurs.
   void DoStopOrError_Locked();
 
   // Runs |paint_cb_| with the next frame from |ready_frames_|.
   //
   // A read is scheduled to replace the frame.
   void PaintNextReadyFrame_Locked();
 
   // Drops the next frame from |ready_frames_| and runs |statistics_cb_|.
   //
@@ skipping 63 matching lines @@
 
   // Video thread handle.
   base::PlatformThreadHandle thread_;
 
   // Keep track of the outstanding read on the VideoFrameStream. Flushing can
   // only complete once the read has completed.
   bool pending_read_;
 
   bool drop_frames_;
 
+  float playback_rate_;
+
   BufferingState buffering_state_;
 
   // Playback operation callbacks.
   base::Closure flush_cb_;
 
   // Event callbacks.
   PipelineStatusCB init_cb_;
   StatisticsCB statistics_cb_;
   TimeCB max_time_cb_;
   BufferingStateCB buffering_state_cb_;
@@ skipping 19 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoRendererImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoRendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_