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Diffstat (limited to 'src/base/RealTime.cpp')
| -rw-r--r-- | src/base/RealTime.cpp | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/src/base/RealTime.cpp b/src/base/RealTime.cpp new file mode 100644 index 0000000..8f8125f --- /dev/null +++ b/src/base/RealTime.cpp @@ -0,0 +1,236 @@ +// -*- c-basic-offset: 4 -*- + +/* + Rosegarden + A sequencer and musical notation editor. + + This program is Copyright 2000-2008 + Guillaume Laurent <[email protected]>, + Chris Cannam <[email protected]>, + Richard Bown <[email protected]> + + 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> + +#if (__GNUC__ < 3) +#include <strstream> +#define stringstream strstream +#else +#include <sstream> +#endif + +#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); + +} |