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      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_
     50