remoting/host/capture_scheduler.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This class chooses a capture interval so as to limit CPU usage to not exceed
   6 // a specified %age. It bases this on the CPU usage of recent capture and encode
   7 // operations, and on the number of available CPUs.
   8
   9 #ifndef REMOTING_HOST_CAPTURE_SCHEDULER_H_
  10 #define REMOTING_HOST_CAPTURE_SCHEDULER_H_
  11
  12 #include "base/time/time.h"
  13 #include "remoting/base/running_average.h"
  14
  15 namespace remoting {
  16
  17 class CaptureScheduler {
  18  public:
  19   CaptureScheduler();
  20   ~CaptureScheduler();
  21
  22   // Returns the time to wait after initiating a capture before triggering
  23   // the next.
  24   base::TimeDelta NextCaptureDelay();
  25
  26   // Records time spent on capturing and encoding.
  27   void RecordCaptureTime(base::TimeDelta capture_time);
  28   void RecordEncodeTime(base::TimeDelta encode_time);
  29
  30   // Sets minimum interval between frames.
  31   void set_minimum_interval(base::TimeDelta minimum_interval) {
  32     minimum_interval_ = minimum_interval;
  33   }
  34
  35   // Overrides the number of processors for testing.
  36   void SetNumOfProcessorsForTest(int num_of_processors);
  37
  38  private:
  39   base::TimeDelta minimum_interval_;
  40   int num_of_processors_;
  41   RunningAverage capture_time_;
  42   RunningAverage encode_time_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(CaptureScheduler);
  45 };
  46
  47 }  // namespace remoting
  48
  49 #endif  // REMOTING_HOST_CAPTURE_SCHEDULER_H_