annotate base/RealTime.h @ 1376:d9511f9e04d7 dev/refactor-piper-related

Introduce some POD structs for describing an external server application and the desired libraries to load from it, and disambiguating between empty list request and invalid list request. This allows for overriding PiperVampPluginFactory behaviour for using a PluginScan to populate the list request.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    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.
*/

/*
   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.
*/

#ifndef SV_REAL_TIME_H
#define SV_REAL_TIME_H

#include "BaseTypes.h"

#include <iostream>
#include <string>

#include <vamp-hostsdk/RealTime.h>

#ifdef _MSC_VER
#include "winsock.h" // struct timeval is in here
#else
#include "sys/time.h"
#endif

/**
 * 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) { }

    RealTime(const Vamp::RealTime &r) :
	sec(r.sec), nsec(r.nsec) { }

    static RealTime fromSeconds(double sec);
    static RealTime fromMilliseconds(int msec);
    static RealTime fromTimeval(const struct timeval &);
    static RealTime fromXsdDuration(std::string xsdd);

    double toDouble() const;
    Vamp::RealTime toVampRealTime() const { return Vamp::RealTime(sec, nsec); }

    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 m) const;
    RealTime operator/(int d) const;

    RealTime operator*(double m) const;
    RealTime operator/(double d) const;

    /**
     * Return the ratio of two 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).  If align
     * is true, prepend " " to the start of positive values so that
     * they line up with negative ones (which start with "-").
     */ 
    std::string toString(bool align = false) const;

    /**
     * Convert a string as obtained from toString back to a RealTime
     * object.
     */
    static RealTime fromString(std::string);

    /**
     * Return a user-readable string to the nearest millisecond,
     * typically in a form like HH:MM:SS.mmm. The exact format will
     * depend on the application preferences for time display
     * precision and hours:minutes:seconds format -- this function
     * simply dispatches to toMSText or toFrameText with appropriate
     * arguments depending on the preferences.
     *
     * If fixedDp is true, the result will be padded to 3 dp,
     * i.e. millisecond resolution, even if the number of milliseconds
     * is a multiple of 10.
     */
    std::string toText(bool fixedDp = false) const;

    /** 
     * Return a user-readable string to the nearest millisecond.
     *
     * If fixedDp is true, the result will be padded to 3 dp,
     * i.e. millisecond resolution, even if the number of milliseconds
     * is a multiple of 10.
     *
     * If hms is true, results may be returned in the form
     * HH:MM:SS.mmm (if the time is large enough). If hms is false,
     * the result will always be a (fractional) number of seconds.
     *
     * Unlike toText, this function does not depend on the application
     * preferences.
     */
    std::string toMSText(bool fixedDp, bool hms) const;
    
    /**
     * Return a user-readable string in which seconds are divided into
     * frames (presumably at a lower frame rate than audio rate,
     * e.g. 24 or 25 video frames), in a form like HH:MM:SS:FF.  fps
     * gives the number of frames per second, and must be integral
     * (29.97 not supported).
     *
     * Unlike toText, this function does not depend on the application
     * preferences.
     */
    std::string toFrameText(int fps, bool hms) const;

    /**
     * Return a user-readable string to the nearest second, in H:M:S
     * form. Does not include milliseconds or frames. The result will
     * be suffixed "s" if it contains only seconds (no hours or
     * minutes).
     *
     * Unlike toText, this function does not depend on the application
     * preferences.
     */
    std::string toSecText() const;

    /**
     * Return a string in xsd:duration format.
     */
    std::string toXsdDuration() const;

    /**
     * Convert a RealTime into a sample frame at the given sample rate.
     */
    static sv_frame_t realTime2Frame(const RealTime &r, sv_samplerate_t sampleRate);

    /**
     * Convert a sample frame at the given sample rate into a RealTime.
     */
    static RealTime frame2RealTime(sv_frame_t frame, sv_samplerate_t sampleRate);

    static const RealTime zeroTime;
};

std::ostream &operator<<(std::ostream &out, const RealTime &rt);
    
#endif