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113 lines
3.3 KiB
C++
113 lines
3.3 KiB
C++
/*
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* MidiTime.h - declaration of class MidiTime which provides data type for
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* position- and length-variables
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*
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* Copyright (c) 2004-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef MIDI_TIME_H
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#define MIDI_TIME_H
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#include <QtGlobal>
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#include "lmms_export.h"
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#include "lmms_basics.h"
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// note: a bar was erroneously called "tact" in older versions of LMMS
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const int DefaultTicksPerBar = 192;
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const int DefaultStepsPerBar = 16;
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const int DefaultBeatsPerBar = DefaultTicksPerBar / DefaultStepsPerBar;
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class MeterModel;
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class LMMS_EXPORT TimeSig
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{
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public:
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// in a time signature,
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// the numerator represents the number of beats in a measure.
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// the denominator indicates which type of note represents a beat.
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// example: 6/8 means 6 beats in a measure, where each beat has duration equal to one 8th-note.
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TimeSig( int num, int denom );
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TimeSig( const MeterModel &model );
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int numerator() const;
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int denominator() const;
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private:
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int m_num;
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int m_denom;
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};
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class LMMS_EXPORT MidiTime
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{
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public:
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MidiTime( const bar_t bar, const tick_t ticks );
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MidiTime( const tick_t ticks = 0 );
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MidiTime quantize(float) const;
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MidiTime toAbsoluteBar() const;
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MidiTime& operator+=( const MidiTime& time );
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MidiTime& operator-=( const MidiTime& time );
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// return the bar, rounded down and 0-based
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bar_t getBar() const;
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// return the bar, rounded up and 0-based
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bar_t nextFullBar() const;
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void setTicks( tick_t ticks );
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tick_t getTicks() const;
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operator int() const;
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tick_t ticksPerBeat( const TimeSig &sig ) const;
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// Remainder ticks after bar is removed
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tick_t getTickWithinBar( const TimeSig &sig ) const;
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// Returns the beat position inside the bar, 0-based
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tick_t getBeatWithinBar( const TimeSig &sig ) const;
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// Remainder ticks after bar and beat are removed
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tick_t getTickWithinBeat( const TimeSig &sig ) const;
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// calculate number of frame that are needed this time
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f_cnt_t frames( const float framesPerTick ) const;
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double getTimeInMilliseconds( bpm_t beatsPerMinute ) const;
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static MidiTime fromFrames( const f_cnt_t frames, const float framesPerTick );
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static tick_t ticksPerBar();
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static tick_t ticksPerBar( const TimeSig &sig );
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static int stepsPerBar();
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static void setTicksPerBar( tick_t tpt );
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static MidiTime stepPosition( int step );
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static double ticksToMilliseconds( tick_t ticks, bpm_t beatsPerMinute );
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static double ticksToMilliseconds( double ticks, bpm_t beatsPerMinute );
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private:
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tick_t m_ticks;
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static tick_t s_ticksPerBar;
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} ;
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#endif
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