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 is used to determine the recoring rate of ScreenRecorder.

[Wez, 2011/10/25 00:05:38]

typo: recoring

[Alpha Left Google, 2011/10/31 18:47:24]

Done.

+// This class gathers history of time spent on encode and capture to
+// determine the delay for next recoding cycle.

[Wez, 2011/10/25 00:05:38]

typo: recoding
nit: Please word this more clearly; 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.

[Alpha Left Google, 2011/10/31 18:47:24]

Done.

+// The algorithm also takes into account number of processors in the
+// system and current system load.
+
+#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();
+
+  // Recording time spend on capturing and encoding.

[Wez, 2011/10/25 00:05:38]

typos: Recording->Record, spend->spent.

[Alpha Left Google, 2011/10/31 18:47:24]

Done.

+  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_