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/*
* MidiTime.h - declaration of class MidiTime which provides data type for
* position- and length-variables
*
* Copyright (c) 2004-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net
*
* This file is part of LMMS - https://lmms.io
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program (see COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
*/
#ifndef MIDI_TIME_H
#define MIDI_TIME_H
#include <QtGlobal>
#include "export.h"
#include "lmms_basics.h"
// note: 1 "Tact" = 1 Measure
const int DefaultTicksPerTact = 192;
const int DefaultStepsPerTact = 16;
const int DefaultBeatsPerTact = DefaultTicksPerTact / DefaultStepsPerTact;
class MeterModel;
class EXPORT TimeSig
{
public:
// in a time signature,
// the numerator represents the number of beats in a measure.
// the denominator indicates which type of note represents a beat.
// example: 6/8 means 6 beats in a measure, where each beat has duration equal to one 8th-note.
TimeSig( int num, int denom );
TimeSig( const MeterModel &model );
int numerator() const;
int denominator() const;
private:
int m_num;
int m_denom;
};
class EXPORT MidiTime
{
public:
MidiTime( const tact_t tact, const tick_t ticks );
MidiTime( const tick_t ticks = 0 );
MidiTime toNearestTact() const;
MidiTime toAbsoluteTact() const;
MidiTime& operator+=( const MidiTime& time );
MidiTime& operator-=( const MidiTime& time );
// return the tact, rounded down and 0-based
tact_t getTact() const;
// return the tact, rounded up and 0-based
tact_t nextFullTact() const;
void setTicks( tick_t ticks );
tick_t getTicks() const;
operator int() const;
tick_t ticksPerBeat( const TimeSig &sig ) const;
// Remainder ticks after bar is removed
tick_t getTickWithinBar( const TimeSig &sig ) const;
// Returns the beat position inside the bar, 0-based
tick_t getBeatWithinBar( const TimeSig &sig ) const;
// Remainder ticks after bar and beat are removed
tick_t getTickWithinBeat( const TimeSig &sig ) const;
// calculate number of frame that are needed this time
f_cnt_t frames( const float framesPerTick ) const;
static MidiTime fromFrames( const f_cnt_t frames, const float framesPerTick );
static tick_t ticksPerTact();
static tick_t ticksPerTact( const TimeSig &sig );
static int stepsPerTact();
static void setTicksPerTact( tick_t tpt );
static MidiTime stepPosition( int step );
private:
tick_t m_ticks;
static tick_t s_ticksPerTact;
} ;
#endif
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