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e05c82758e
Add a method to convert a MidiTime instance to milliseconds. Also add a static method to MidiTime that computes the time in milliseconds for a given number of ticks and a tempo. Remove the method that sets the milliseconds explicitly from Song. Replace it by a method that takes a MidiTime instance and one method that takes an amount of ticks. Remove several explicit time calculations from the implementation of Song and TimeLineWidget. Instead use the new methods.
113 lines
3.1 KiB
C++
113 lines
3.1 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 "export.h"
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#include "lmms_basics.h"
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// note: 1 "Tact" = 1 Measure
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const int DefaultTicksPerTact = 192;
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const int DefaultStepsPerTact = 16;
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const int DefaultBeatsPerTact = DefaultTicksPerTact / DefaultStepsPerTact;
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class MeterModel;
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class 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 EXPORT MidiTime
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{
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public:
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MidiTime( const tact_t tact, const tick_t ticks );
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MidiTime( const tick_t ticks = 0 );
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MidiTime toNearestTact() const;
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MidiTime toAbsoluteTact() 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 tact, rounded down and 0-based
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tact_t getTact() const;
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// return the tact, rounded up and 0-based
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tact_t nextFullTact() 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 ticksPerTact();
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static tick_t ticksPerTact( const TimeSig &sig );
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static int stepsPerTact();
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static void setTicksPerTact( 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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private:
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tick_t m_ticks;
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static tick_t s_ticksPerTact;
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} ;
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#endif
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