diff sdk/RealTime.cpp @ 0:6479539d1b32

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

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sdk/RealTime.cpp	Fri Mar 31 14:21:51 2006 +0000
@@ -0,0 +1,248 @@
+/* -*- 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
+*/
+
+#include <iostream>
+
+#if (__GNUC__ < 3)
+#include <strstream>
+#define stringstream strstream
+#else
+#include <sstream>
+#endif
+
+using std::cerr;
+using std::endl;
+
+#include "RealTime.h"
+#include "sys/time.h"
+
+namespace Vamp {
+
+// A RealTime consists of two ints that must be at least 32 bits each.
+// A signed 32-bit int can store values exceeding +/- 2 billion.  This
+// means we can safely use our lower int for nanoseconds, as there are
+// 1 billion nanoseconds in a second and we need to handle double that
+// because of the implementations of addition etc that we use.
+//
+// The maximum valid RealTime on a 32-bit system is somewhere around
+// 68 years: 999999999 nanoseconds longer than the classic Unix epoch.
+
+#define ONE_BILLION 1000000000
+
+RealTime::RealTime(int s, int n) :
+    sec(s), nsec(n)
+{
+    if (sec == 0) {
+	while (nsec <= -ONE_BILLION) { nsec += ONE_BILLION; --sec; }
+	while (nsec >=  ONE_BILLION) { nsec -= ONE_BILLION; ++sec; }
+    } else if (sec < 0) {
+	while (nsec <= -ONE_BILLION) { nsec += ONE_BILLION; --sec; }
+	while (nsec > 0)             { nsec -= ONE_BILLION; ++sec; }
+    } else { 
+	while (nsec >=  ONE_BILLION) { nsec -= ONE_BILLION; ++sec; }
+	while (nsec < 0)             { nsec += ONE_BILLION; --sec; }
+    }
+}
+
+RealTime
+RealTime::fromSeconds(double sec)
+{
+    return RealTime(int(sec), int((sec - int(sec)) * ONE_BILLION));
+}
+
+RealTime
+RealTime::fromMilliseconds(int msec)
+{
+    return RealTime(msec / 1000, (msec % 1000) * 1000000);
+}
+
+RealTime
+RealTime::fromTimeval(const struct timeval &tv)
+{
+    return RealTime(tv.tv_sec, tv.tv_usec * 1000);
+}
+
+std::ostream &operator<<(std::ostream &out, const RealTime &rt)
+{
+    if (rt < RealTime::zeroTime) {
+	out << "-";
+    } else {
+	out << " ";
+    }
+
+    int s = (rt.sec < 0 ? -rt.sec : rt.sec);
+    int n = (rt.nsec < 0 ? -rt.nsec : rt.nsec);
+
+    out << s << ".";
+
+    int nn(n);
+    if (nn == 0) out << "00000000";
+    else while (nn < (ONE_BILLION / 10)) {
+	out << "0";
+	nn *= 10;
+    }
+    
+    out << n << "R";
+    return out;
+}
+
+std::string
+RealTime::toString() const
+{
+    std::stringstream out;
+    out << *this;
+    
+#if (__GNUC__ < 3)
+    out << std::ends;
+#endif
+
+    std::string s = out.str();
+
+    // remove trailing R
+    return s.substr(0, s.length() - 1);
+}
+
+std::string
+RealTime::toText(bool fixedDp) const
+{
+    if (*this < RealTime::zeroTime) return "-" + (-*this).toText();
+
+    std::stringstream out;
+
+    if (sec >= 3600) {
+	out << (sec / 3600) << ":";
+    }
+
+    if (sec >= 60) {
+	out << (sec % 3600) / 60 << ":";
+    }
+
+    if (sec >= 10) {
+	out << ((sec % 60) / 10);
+    }
+
+    out << (sec % 10);
+    
+    int ms = msec();
+
+    if (ms != 0) {
+	out << ".";
+	out << (ms / 100);
+	ms = ms % 100;
+	if (ms != 0) {
+	    out << (ms / 10);
+	    ms = ms % 10;
+	} else if (fixedDp) {
+	    out << "0";
+	}
+	if (ms != 0) {
+	    out << ms;
+	} else if (fixedDp) {
+	    out << "0";
+	}
+    } else if (fixedDp) {
+	out << ".000";
+    }
+	
+#if (__GNUC__ < 3)
+    out << std::ends;
+#endif
+
+    std::string s = out.str();
+
+    return s;
+}
+
+
+RealTime
+RealTime::operator/(int d) const
+{
+    int secdiv = sec / d;
+    int secrem = sec % d;
+
+    double nsecdiv = (double(nsec) + ONE_BILLION * double(secrem)) / d;
+    
+    return RealTime(secdiv, int(nsecdiv + 0.5));
+}
+
+double 
+RealTime::operator/(const RealTime &r) const
+{
+    double lTotal = double(sec) * ONE_BILLION + double(nsec);
+    double rTotal = double(r.sec) * ONE_BILLION + double(r.nsec);
+    
+    if (rTotal == 0) return 0.0;
+    else return lTotal/rTotal;
+}
+
+long
+RealTime::realTime2Frame(const RealTime &time, unsigned int sampleRate)
+{
+    if (time < zeroTime) return -realTime2Frame(-time, sampleRate);
+
+    // We like integers.  The last term is always zero unless the
+    // sample rate is greater than 1MHz, but hell, you never know...
+
+    long frame =
+	time.sec * sampleRate +
+	(time.msec() * sampleRate) / 1000 +
+	((time.usec() - 1000 * time.msec()) * sampleRate) / 1000000 +
+	((time.nsec - 1000 * time.usec()) * sampleRate) / 1000000000;
+
+    return frame;
+}
+
+RealTime
+RealTime::frame2RealTime(long frame, unsigned int sampleRate)
+{
+    if (frame < 0) return -frame2RealTime(-frame, sampleRate);
+
+    RealTime rt;
+    rt.sec = frame / long(sampleRate);
+    frame -= rt.sec * long(sampleRate);
+    rt.nsec = (int)(((float(frame) * 1000000) / long(sampleRate)) * 1000);
+    return rt;
+}
+
+const RealTime RealTime::zeroTime(0,0);
+
+}