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//
// Programmer: Craig Stuart Sapp <craig@ccrma.stanford.edu>
// Thanks to: Erik Neuenschwander <erikn@leland.stanford.edu>
// for Windows 95 assembly code for Pentium clock cycles.
// Ozgur Izmirli <ozgur@ccrma.stanford.edu>
// for concept of periodic timer.
// Creation Date: Mon Oct 13 11:34:57 GMT-0800 1997
// Last Modified: Tue Feb 10 21:05:19 GMT-0800 1998
// Last Modified: Sat Sep 19 15:56:48 PDT 1998
// Last Modified: Mon Feb 22 04:44:25 PST 1999
// Last Modified: Sun Nov 28 12:39:39 PST 1999 (added adjustPeriod())
// Filename: .../sig/code/control/SigTimer/SigTimer.h
// Web Address: http://www-ccrma.stanford.edu/~craig/improv/include/SigTimer.h
// Syntax: C++
//
// Description: This class can only be used on Motorola Pentinum 75 Mhz
// chips or better because the timing information is
// extracted from the clock cycle count from a register
// on the CPU itself. This class will estimate the
// speed of the computer, but it would be better if there
// was a way of finding out the speed from some function.
// This class is used primarily for timing of MIDI input
// and output at a millisecond resolution.
//
// Interesting: http://www.datasilicon.nl/I786/timer_1.htm
//
#ifndef _SIGTIMER_H_INCLUDED
#define _SIGTIMER_H_INCLUDED
#ifdef VISUAL
#include <wtypes.h>
typedef LONGLONG int64bits;
#else
typedef long long int int64bits;
#include <unistd.h> /* for millisleep function */
#endif
class SigTimer {
public:
SigTimer (void);
SigTimer (int aSpeed);
SigTimer (SigTimer& aTimer);
~SigTimer ();
void adjustPeriod (double periodDelta);
int expired (void) const;
double getPeriod (void) const;
double getPeriodCount (void) const;
double getTempo (void) const;
int getTicksPerSecond (void) const;
int getTime (void) const;
double getTimeInSeconds (void) const;
int getTimeInTicks (void) const;
void reset (void);
void setPeriod (double aPeriod);
void setTempo (double beatsPerMinute);
void setPeriodCount (double aCount);
void setTicksPerSecond (int aTickRate);
void start (void);
void sync (SigTimer& aTimer);
void update (void);
void update (int periodCount);
// The following functions are semi-private. They do not have
// anything to do with timing themselves, but are a by-product
// of the timer implementation. They are useful, so they have
// been left public; however, they should be used judiciously.
static int getCpuSpeed (void);
static int measureCpuSpeed (int quantize = 0);
static void setCpuSpeed (int aSpeed);
// the following function is hardware specific to Intel Pentium
// computers with a processor speed of at least 75 MHz.
// This function is the only non-portable function in this
// class, but everything else is based on it.
static int64bits clockCycles (void);
protected:
static int64bits globalOffset;
static int cpuSpeed;
int64bits offset;
int ticksPerSecond;
double period;
// protected functions
double getFactor (void) const;
};
// The following function is mostly for Linux:
void millisleep(int milliseconds);
void millisleep(float milliseconds);
#endif /* _SIGTIMER_H_INCLUDED */
// md5sum: 601fa3caae4e3bacc4e6fb87f545c86b - SigTimer.h =css= 20030102
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