cast: Support for low-latency interactive mode

media/capture/content/video_capture_oracle.h

 // Copyright (c) 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_CAPTURE_VIDEO_CAPTURE_ORACLE_H_
-#define MEDIA_CAPTURE_VIDEO_CAPTURE_ORACLE_H_
+#ifndef MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_ORACLE_H_
+#define MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_ORACLE_H_
 
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "media/base/media_export.h"
 #include "media/capture/content/animated_content_sampler.h"
 #include "media/capture/content/capture_resolution_chooser.h"
 #include "media/capture/content/feedback_signal_accumulator.h"
 #include "media/capture/content/smooth_event_sampler.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 74 matching lines @@
   // be non-zero if the call returned true.
   base::TimeDelta estimated_frame_duration() const {
     return duration_of_next_frame_;
   }
 
   // Returns the capture frame size the client should use.  This is updated by
   // calls to ObserveEventAndDecideCapture().  The oracle prevents too-frequent
   // changes to the capture size, to avoid stressing the end-to-end pipeline.
   gfx::Size capture_size() const { return capture_size_; }
 
+  // Returns the oracle's estimate of animation content currently being active.
+  bool IsAnimationActive() const;
+
  private:
   // Retrieve/Assign a frame timestamp by capture |frame_number|.  Only valid
   // when IsFrameInRecentHistory(frame_number) returns true.
   base::TimeTicks GetFrameTimestamp(int frame_number) const;
   void SetFrameTimestamp(int frame_number, base::TimeTicks timestamp);
 
   // Returns true if the frame timestamp ring-buffer currently includes a
   // slot for the given |frame_number|.
   bool IsFrameInRecentHistory(int frame_number) const;
 
@@ skipping 81 matching lines @@
   base::TimeTicks start_time_of_underutilization_;
 
   // The timestamp of the frame where |content_sampler_| last detected
   // animation.  This determines whether capture size increases will be
   // aggressive (because content is not animating).
   base::TimeTicks last_time_animation_was_detected_;
 };
 
 }  // namespace media
 
-#endif  // MEDIA_CAPTURE_VIDEO_CAPTURE_ORACLE_H_
+#endif  // MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_ORACLE_H_