79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
//=============================================================================
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// MuseScore
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// Music Composition & Notation
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//
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// Copyright (C) 2002-2011 Werner Schweer
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2
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// as published by the Free Software Foundation and appearing in
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// the file LICENCE.GPL
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//=============================================================================
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#ifndef __AL_TEMPO_H__
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#define __AL_TEMPO_H__
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namespace Ms {
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class XmlWriter;
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enum class TempoType : char {
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INVALID = 0x0, PAUSE = 0x1, FIX = 0x2, RAMP = 0x4
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};
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typedef QFlags<TempoType> TempoTypes;
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Q_DECLARE_OPERATORS_FOR_FLAGS(TempoTypes);
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//---------------------------------------------------------
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// Tempo Event
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//---------------------------------------------------------
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struct TEvent {
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TempoTypes type;
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qreal tempo; // beats per second
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qreal pause; // pause in seconds
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qreal time; // precomputed time for tick in sec
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TEvent();
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TEvent(const TEvent& e);
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TEvent(qreal bps, qreal seconds, TempoType t);
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bool valid() const;
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};
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//---------------------------------------------------------
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// Tempomap
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//---------------------------------------------------------
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class TempoMap : public std::map<int, TEvent>
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{
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int _tempoSN; // serial no to track tempo changes
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qreal _tempo; // tempo if not using tempo list (beats per second)
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qreal _relTempo; // rel. tempo
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void normalize();
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void del(int tick);
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public:
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TempoMap();
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void clear();
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void clearRange(int tick1, int tick2);
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void dump() const;
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qreal tempo(int tick) const;
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qreal tick2time(int tick, int* sn = 0) const;
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qreal tick2timeLC(int tick, int* sn) const;
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qreal tick2time(int tick, qreal time, int* sn) const;
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int time2tick(qreal time, int* sn = 0) const;
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int time2tick(qreal time, int tick, int* sn) const;
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int tempoSN() const { return _tempoSN; }
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void setTempo(int t, qreal);
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void setPause(int t, qreal);
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void delTempo(int tick);
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void setRelTempo(qreal val);
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qreal relTempo() const { return _relTempo; }
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};
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} // namespace Ms
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#endif
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