Gather history of capture and encode time determine next recoring delay

remoting/host/capture_scheduler.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.
+
+// This class chooses a capture interval so as to limit CPU usage to not exceed
+// a specified %age. It bases this on the CPU usage of recent capture and encode
+// operations, and on the number of available CPUs.
+
+#ifndef REMOTING_HOST_CAPTURE_SCHEDULER_H_
+#define REMOTING_HOST_CAPTURE_SCHEDULER_H_
+
+#include "base/time.h"
+#include "remoting/base/running_average.h"
+
+namespace remoting {
+
+class CaptureScheduler {
+ public:
+  CaptureScheduler();
+  ~CaptureScheduler();
+
+  // Determine the time delay from current time to perform next capture.
+  base::TimeDelta NextCaptureDelay();
+
+  // Record time spent on capturing and encoding.
+  void RecordCaptureTime(base::TimeDelta capture_time);
+  void RecordEncodeTime(base::TimeDelta encode_time);
+
+ private:
+  int num_of_processors_;
+  RunningAverage capture_time_;
+  RunningAverage encode_time_;
+
+  DISALLOW_COPY_AND_ASSIGN(CaptureScheduler);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_CAPTURE_SCHEDULER_H_