Chris@0: /* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */
Chris@0: 
Chris@0: /*
Chris@0:     A waveform viewer and audio annotation editor.
Chris@0:     Chris Cannam, Queen Mary University of London, 2005
Chris@0:     
Chris@0:     This is experimental software.  Not for distribution.
Chris@0: */
Chris@0: 
Chris@0: /*
Chris@0:    This is a modified version of a source file from the 
Chris@0:    Rosegarden MIDI and audio sequencer and notation editor.
Chris@0:    This file copyright 2000-2005 Chris Cannam.
Chris@0: */
Chris@0: 
Chris@0: #ifndef _REAL_TIME_H_
Chris@0: #define _REAL_TIME_H_
Chris@0: 
Chris@0: #include <iostream>
Chris@0: #include <string>
Chris@0: 
Chris@0: /**
Chris@0:  * RealTime represents time values to nanosecond precision
Chris@0:  * with accurate arithmetic and frame-rate conversion functions.
Chris@0:  */
Chris@0: 
Chris@0: struct RealTime
Chris@0: {
Chris@0:     int sec;
Chris@0:     int nsec;
Chris@0: 
Chris@0:     int usec() const { return nsec / 1000; }
Chris@0:     int msec() const { return nsec / 1000000; }
Chris@0: 
Chris@0:     RealTime(): sec(0), nsec(0) {}
Chris@0:     RealTime(int s, int n);
Chris@0: 
Chris@0:     RealTime(const RealTime &r) :
Chris@0: 	sec(r.sec), nsec(r.nsec) { }
Chris@0: 
Chris@0:     RealTime &operator=(const RealTime &r) {
Chris@0: 	sec = r.sec; nsec = r.nsec; return *this;
Chris@0:     }
Chris@0: 
Chris@0:     RealTime operator+(const RealTime &r) const {
Chris@0: 	return RealTime(sec + r.sec, nsec + r.nsec);
Chris@0:     }
Chris@0:     RealTime operator-(const RealTime &r) const {
Chris@0: 	return RealTime(sec - r.sec, nsec - r.nsec);
Chris@0:     }
Chris@0:     RealTime operator-() const {
Chris@0: 	return RealTime(-sec, -nsec);
Chris@0:     }
Chris@0: 
Chris@0:     bool operator <(const RealTime &r) const {
Chris@0: 	if (sec == r.sec) return nsec < r.nsec;
Chris@0: 	else return sec < r.sec;
Chris@0:     }
Chris@0: 
Chris@0:     bool operator >(const RealTime &r) const {
Chris@0: 	if (sec == r.sec) return nsec > r.nsec;
Chris@0: 	else return sec > r.sec;
Chris@0:     }
Chris@0: 
Chris@0:     bool operator==(const RealTime &r) const {
Chris@0:         return (sec == r.sec && nsec == r.nsec);
Chris@0:     }
Chris@0:  
Chris@0:     bool operator!=(const RealTime &r) const {
Chris@0:         return !(r == *this);
Chris@0:     }
Chris@0:  
Chris@0:     bool operator>=(const RealTime &r) const {
Chris@0:         if (sec == r.sec) return nsec >= r.nsec;
Chris@0:         else return sec >= r.sec;
Chris@0:     }
Chris@0: 
Chris@0:     bool operator<=(const RealTime &r) const {
Chris@0:         if (sec == r.sec) return nsec <= r.nsec;
Chris@0:         else return sec <= r.sec;
Chris@0:     }
Chris@0: 
Chris@0:     RealTime operator/(int d) const;
Chris@0: 
Chris@0:     // Find the fractional difference between times
Chris@0:     //
Chris@0:     double operator/(const RealTime &r) const;
Chris@0: 
Chris@0:     // Return a human-readable debug-type string to full precision
Chris@0:     // (probably not a format to show to a user directly)
Chris@0:     // 
Chris@0:     std::string toString() const;
Chris@0: 
Chris@0:     // Return a user-readable string to the nearest millisecond
Chris@0:     // in a form like HH:MM:SS.mmm
Chris@0:     //
Chris@0:     std::string toText(bool fixedDp = false) const;
Chris@0: 
Chris@0:     // Convenience functions for handling sample frames
Chris@0:     //
Chris@0:     static long realTime2Frame(const RealTime &r, unsigned int sampleRate);
Chris@0:     static RealTime frame2RealTime(long frame, unsigned int sampleRate);
Chris@0: 
Chris@0:     static const RealTime zeroTime;
Chris@0: };
Chris@0: 
Chris@0: std::ostream &operator<<(std::ostream &out, const RealTime &rt);
Chris@0:     
Chris@0: #endif