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authorHans-Christoph Steiner <eighthave@users.sourceforge.net>2005-11-10 05:52:11 +0000
committerHans-Christoph Steiner <eighthave@users.sourceforge.net>2005-11-10 05:52:11 +0000
commitceac394c2133d44e81db2eb633ff54a9ad6ce7c5 (patch)
treeadc534407af80a976263c907897907cb13ef1c82 /src/midiio/include/SigTimer.h
This commit was generated by cvs2svn to compensate for changes in r3865,svn2git-root
which included commits to RCS files with non-trunk default branches. svn path=/trunk/extensions/gripd/; revision=3866
Diffstat (limited to 'src/midiio/include/SigTimer.h')
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diff --git a/src/midiio/include/SigTimer.h b/src/midiio/include/SigTimer.h
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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