#define NOMINMAX\r
\r
#include <windows.h>\r
-#include <Mmsystem.h>\r
\r
namespace caspar {\r
\r
{\r
public:\r
high_prec_timer()\r
- : time_(0)\r
{\r
+ QueryPerformanceFrequency(&freq_);\r
+ QueryPerformanceCounter(&time_);\r
}\r
\r
// Author: Ryan M. Geiss\r
// http://www.geisswerks.com/ryan/FAQS/timing.html\r
void tick(double interval)\r
{ \r
- auto t = ::timeGetTime();\r
+ LARGE_INTEGER t;\r
+ QueryPerformanceCounter(&t);\r
\r
- if (time_ != 0)\r
+ if (time_.QuadPart != 0)\r
{\r
- auto ticks_to_wait = static_cast<DWORD>(interval*1000.0);\r
- bool done = 0;\r
+ __int64 ticks_to_wait = static_cast<int>(static_cast<double>(freq_.QuadPart) * interval);\r
+ __int64 done = 0;\r
do\r
- { \r
- auto ticks_passed = t - time_;\r
- auto ticks_left = ticks_to_wait - ticks_passed;\r
+ {\r
+ QueryPerformanceCounter(&t);\r
+ \r
+ __int64 ticks_passed = static_cast<__int64>(t.QuadPart) - static_cast<__int64>(time_.QuadPart);\r
+ __int64 ticks_left = ticks_to_wait - ticks_passed;\r
\r
- if (t < time_) // time wrap\r
+ if (t.QuadPart < time_.QuadPart) // time wrap\r
done = 1;\r
if (ticks_passed >= ticks_to_wait)\r
done = 1;\r
// otherwise, do a few Sleep(0)'s, which just give up the timeslice,\r
// but don't really save cpu or battery, but do pass a tiny\r
// amount of time.\r
- if (ticks_left > 2)\r
+ if (ticks_left > static_cast<__int64>((freq_.QuadPart*2)/1000))\r
Sleep(1);\r
else \r
for (int i = 0; i < 10; ++i) \r
Sleep(0); // causes thread to give up its timeslice\r
}\r
-\r
- t = ::timeGetTime();\r
}\r
while (!done); \r
}\r
time_ = t;\r
} \r
private: \r
- DWORD time_;\r
+ LARGE_INTEGER freq_;\r
+ LARGE_INTEGER time_;\r
};\r
\r
\r