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//=============================================================================
// MuseScore
// Music Composition & Notation
// $Id: tempo.h 5574 2012-04-23 18:54:54Z wschweer $
//
// Copyright (C) 2002-2011 Werner Schweer
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2
// as published by the Free Software Foundation and appearing in
// the file LICENCE.GPL
//=============================================================================
#ifndef __AL_TEMPO_H__
#define __AL_TEMPO_H__
class Xml;
enum TempoType { TEMPO_INVALID, TEMPO_FIX, TEMPO_RAMP };
//---------------------------------------------------------
// Tempo Event
//---------------------------------------------------------
struct TEvent {
TempoType type;
qreal tempo; // beats per second
qreal pause; // pause in seconds
qreal time; // precomputed time for tick in sec
TEvent();
TEvent(const TEvent& e);
TEvent(qreal bps, qreal seconds, TempoType t);
bool valid() const { return type != TEMPO_INVALID; }
};
//---------------------------------------------------------
// Tempomap
//---------------------------------------------------------
typedef std::map<int, TEvent>::iterator iTEvent;
typedef std::map<int, TEvent>::const_iterator ciTEvent;
typedef std::map<int, TEvent>::reverse_iterator riTEvent;
typedef std::map<int, TEvent>::const_reverse_iterator criTEvent;
class TempoMap : public std::map<int, TEvent> {
int _tempoSN; // serial no to track tempo changes
qreal _tempo; // tempo if not using tempo list (beats per second)
qreal _relTempo; // rel. tempo
void normalize();
void del(int tick);
public:
TempoMap();
void clear();
void dump() const;
qreal tempo(int tick) const;
qreal tick2time(int tick, int* sn = 0) const;
qreal tick2timeLC(int tick, int* sn) const;
qreal tick2time(int tick, qreal time, int* sn) const;
int time2tick(qreal time, int* sn = 0) const;
int time2tick(qreal time, int tick, int* sn) const;
int tempoSN() const { return _tempoSN; }
void setTempo(int t, qreal);
void setPause(int t, qreal);
void delTempo(int tick);
void setRelTempo(qreal val);
qreal relTempo() const { return _relTempo; }
};
#endif
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