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