diff base/RealTime.h @ 0:fc9323a41f5a

start base : Sonic Visualiser sv1-1.0rc1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/RealTime.h	Fri May 11 09:08:14 2007 +0000
@@ -0,0 +1,129 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+/*
+   This is a modified version of a source file from the 
+   Rosegarden MIDI and audio sequencer and notation editor.
+   This file copyright 2000-2006 Chris Cannam.
+*/
+
+#ifndef _REAL_TIME_H_
+#define _REAL_TIME_H_
+
+#include <iostream>
+#include <string>
+
+struct timeval;
+
+
+/**
+ * RealTime represents time values to nanosecond precision
+ * with accurate arithmetic and frame-rate conversion functions.
+ */
+
+struct RealTime
+{
+    int sec;
+    int nsec;
+
+    int usec() const { return nsec / 1000; }
+    int msec() const { return nsec / 1000000; }
+
+    RealTime(): sec(0), nsec(0) {}
+    RealTime(int s, int n);
+
+    RealTime(const RealTime &r) :
+	sec(r.sec), nsec(r.nsec) { }
+
+    static RealTime fromSeconds(double sec);
+    static RealTime fromMilliseconds(int msec);
+    static RealTime fromTimeval(const struct timeval &);
+
+    RealTime &operator=(const RealTime &r) {
+	sec = r.sec; nsec = r.nsec; return *this;
+    }
+
+    RealTime operator+(const RealTime &r) const {
+	return RealTime(sec + r.sec, nsec + r.nsec);
+    }
+    RealTime operator-(const RealTime &r) const {
+	return RealTime(sec - r.sec, nsec - r.nsec);
+    }
+    RealTime operator-() const {
+	return RealTime(-sec, -nsec);
+    }
+
+    bool operator <(const RealTime &r) const {
+	if (sec == r.sec) return nsec < r.nsec;
+	else return sec < r.sec;
+    }
+
+    bool operator >(const RealTime &r) const {
+	if (sec == r.sec) return nsec > r.nsec;
+	else return sec > r.sec;
+    }
+
+    bool operator==(const RealTime &r) const {
+        return (sec == r.sec && nsec == r.nsec);
+    }
+ 
+    bool operator!=(const RealTime &r) const {
+        return !(r == *this);
+    }
+ 
+    bool operator>=(const RealTime &r) const {
+        if (sec == r.sec) return nsec >= r.nsec;
+        else return sec >= r.sec;
+    }
+
+    bool operator<=(const RealTime &r) const {
+        if (sec == r.sec) return nsec <= r.nsec;
+        else return sec <= r.sec;
+    }
+
+    RealTime operator*(int m) const;
+    RealTime operator/(int d) const;
+
+    // Find the fractional difference between times
+    //
+    double operator/(const RealTime &r) const;
+
+    // Return a human-readable debug-type string to full precision
+    // (probably not a format to show to a user directly).  If align
+    // is true, prepend " " to the start of positive values so that
+    // they line up with negative ones (which start with "-").
+    // 
+    std::string toString(bool align = false) const;
+
+    // Return a user-readable string to the nearest millisecond
+    // in a form like HH:MM:SS.mmm
+    //
+    std::string toText(bool fixedDp = false) const;
+
+    // Return a user-readable string to the nearest second in a form
+    // like "6s" (for less than a minute) or "2:21" (for more).
+    //
+    std::string toSecText() const;
+
+    // Convenience functions for handling sample frames
+    //
+    static long realTime2Frame(const RealTime &r, unsigned int sampleRate);
+    static RealTime frame2RealTime(long frame, unsigned int sampleRate);
+
+    static const RealTime zeroTime;
+};
+
+std::ostream &operator<<(std::ostream &out, const RealTime &rt);
+    
+#endif