moflib-2.0/src/mof/util/windows/multimedia_timer.cpp

   1 #include <mof/util/multimedia_timer.hpp>
   2 #include <windows.h>
   3 #include <iostream>
   4
   5
   6 namespace mof
   7 {
   8 namespace util
   9 {
  10 //{{{ impl
  11     struct multimedia_timer::impl
  12     {
  13                 LARGE_INTEGER start_time_;
  14                 double frequency_;
  15     };
  16 //}}}
  17 //{{{ constructor
  18     multimedia_timer::multimedia_timer()
  19     : pimpl_(new impl)
  20     {
  21                 LARGE_INTEGER frequency;// count per sec
  22                 QueryPerformanceFrequency(&frequency);
  23                 pimpl_->frequency_ = static_cast<double>(frequency.QuadPart) / 1000000;// count per micro sec
  24         reset();
  25     }
  26 //}}}
  27 //{{{ destructor
  28     multimedia_timer::~multimedia_timer(){}
  29 //}}}
  30 //{{{ reset
  31     void multimedia_timer::reset()
  32     {
  33                 QueryPerformanceCounter(&pimpl_->start_time_);
  34     }
  35 //}}}
  36 //{{{ get_time_in_micro_sec
  37     mof::uint64 multimedia_timer::get_time_in_micro_sec() const
  38     {
  39                 LARGE_INTEGER current_time;
  40                 QueryPerformanceCounter(&current_time);
  41                 double span = static_cast<double>(current_time.QuadPart - pimpl_->start_time_.QuadPart) / pimpl_->frequency_;
  42                 return static_cast<int>(span);
  43     }
  44 //}}}
  45
  46 }// namespace util
  47 }// namespace mof
  48