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/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
The moral right of the authors to claim authorship of this work
has been asserted.
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.
*/
#include <iostream>
#include <sstream>
#include "RealTime.h"
#include "sys/time.h"
namespace Rosegarden {
// 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 + 0.5));
}
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(bool align) const
{
std::stringstream out;
out << *this;
#if (__GNUC__ < 3)
out << std::ends;
#endif
std::string s = out.str();
if (!align && *this >= RealTime::zeroTime) {
// remove leading " "
s = s.substr(1, s.length() - 1);
}
// 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*(double m) const
{
double t = (double(nsec) / ONE_BILLION) * m;
t += sec * m;
return fromSeconds(t);
}
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 / sampleRate;
frame -= rt.sec * sampleRate;
rt.nsec = (int)(((float(frame) * 1000000) / sampleRate) * 1000);
return rt;
}
const RealTime RealTime::zeroTime(0,0);
}
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