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      1 /*
      2  * libjingle
      3  * Copyright 2004--2010, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_BASE_RATETRACKER_H_
     29 #define TALK_BASE_RATETRACKER_H_
     30 
     31 #include <stdlib.h>
     32 #include "talk/base/basictypes.h"
     33 
     34 namespace talk_base {
     35 
     36 // Computes instantaneous units per second.
     37 class RateTracker {
     38  public:
     39   RateTracker();
     40   virtual ~RateTracker() {}
     41 
     42   size_t total_units() const;
     43   size_t units_second();
     44   void Update(size_t units);
     45 
     46  protected:
     47   // overrideable for tests
     48   virtual uint32 Time() const;
     49 
     50  private:
     51   size_t total_units_;
     52   size_t units_second_;
     53   uint32 last_units_second_time_;
     54   size_t last_units_second_calc_;
     55 };
     56 
     57 }  // namespace talk_base
     58 
     59 #endif  // TALK_BASE_RATETRACKER_H_
     60