comparison sdk/RealTime.h @ 0:6479539d1b32

* Importing first cut of Sonic Visualiser's Vamp plugin format SDK

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Vamp
+
+    An API for audio analysis and feature extraction plugins.
+
+    Centre for Digital Music, Queen Mary, University of London.
+    Copyright 2006 Chris Cannam.
+  
+    Permission is hereby granted, free of charge, to any person
+    obtaining a copy of this software and associated documentation
+    files (the "Software"), to deal in the Software without
+    restriction, including without limitation the rights to use, copy,
+    modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+    NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR
+    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+    Except as contained in this notice, the names of the Centre for
+    Digital Music; Queen Mary, University of London; and Chris Cannam
+    shall not be used in advertising or otherwise to promote the sale,
+    use or other dealings in this Software without prior written
+    authorization.
+*/
+
+/*
+   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; relicensed as detailed above
+*/
+
+#ifndef _REAL_TIME_H_
+#define _REAL_TIME_H_
+
+#include <iostream>
+#include <string>
+
+struct timeval;
+
+namespace Vamp {
+
+/**
+ * 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 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)
+    // 
+    std::string toString() 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;
+
+    // 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