xref: /dports/audio/lmms/lmms-1.2.2/src/core/midi/MidiTime.cpp

/*
 * MidiTime.cpp - Class that encapsulates the position of a note/event in terms of
 *   its bar, beat and tick.
 *
 * 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.
 *
 */

#include "MidiTime.h"

#include "MeterModel.h"

TimeSig::TimeSig( int num, int denom ) :
	m_num(num),
	m_denom(denom)
{
}

TimeSig::TimeSig( const MeterModel &model ) :
	m_num(model.getNumerator()),
	m_denom(model.getDenominator())
{
}


int TimeSig::numerator() const
{
	return m_num;
}

int TimeSig::denominator() const
{
	return m_denom;
}




MidiTime::MidiTime( const tact_t tact, const tick_t ticks ) :
	m_ticks( tact * s_ticksPerTact + ticks )
{
}

MidiTime::MidiTime( const tick_t ticks ) :
	m_ticks( ticks )
{
}

MidiTime MidiTime::toNearestTact() const
{
	if( m_ticks % s_ticksPerTact >= s_ticksPerTact/2 )
	{
		return ( getTact() + 1 ) * s_ticksPerTact;
	}
	return getTact() * s_ticksPerTact;
}


MidiTime MidiTime::toAbsoluteTact() const
{
	return getTact() * s_ticksPerTact;
}


MidiTime& MidiTime::operator+=( const MidiTime& time )
{
	m_ticks += time.m_ticks;
	return *this;
}


MidiTime& MidiTime::operator-=( const MidiTime& time )
{
	m_ticks -= time.m_ticks;
	return *this;
}


tact_t MidiTime::getTact() const
{
	return m_ticks / s_ticksPerTact;
}


tact_t MidiTime::nextFullTact() const
{
	return (m_ticks + (s_ticksPerTact-1)) / s_ticksPerTact;
}


void MidiTime::setTicks( tick_t ticks )
{
	m_ticks = ticks;
}


tick_t MidiTime::getTicks() const
{
	return m_ticks;
}


MidiTime::operator int() const
{
	return m_ticks;
}


tick_t MidiTime::ticksPerBeat( const TimeSig &sig ) const
{
	// (number of ticks per bar) divided by (number of beats per bar)
	return ticksPerTact(sig) / sig.numerator();
}


tick_t MidiTime::getTickWithinBar( const TimeSig &sig ) const
{
	return m_ticks % ticksPerTact(sig);
}

tick_t MidiTime::getBeatWithinBar( const TimeSig &sig ) const
{
	return getTickWithinBar(sig) / ticksPerBeat(sig);
}

tick_t MidiTime::getTickWithinBeat( const TimeSig &sig ) const
{
	return getTickWithinBar(sig) % ticksPerBeat(sig);
}


f_cnt_t MidiTime::frames( const float framesPerTick ) const
{
	if( m_ticks >= 0 )
	{
		return static_cast<f_cnt_t>( m_ticks * framesPerTick );
	}
	return 0;
}


MidiTime MidiTime::fromFrames( const f_cnt_t frames, const float framesPerTick )
{
	return MidiTime( static_cast<int>( frames / framesPerTick ) );
}


tick_t MidiTime::ticksPerTact()
{
	return s_ticksPerTact;
}


tick_t MidiTime::ticksPerTact( const TimeSig &sig )
{
	return DefaultTicksPerTact * sig.numerator() / sig.denominator();
}


int MidiTime::stepsPerTact()
{
	int steps = ticksPerTact() / DefaultBeatsPerTact;
	return qMax( 1, steps );
}


void MidiTime::setTicksPerTact( tick_t tpt )
{
	s_ticksPerTact = tpt;
}


MidiTime MidiTime::stepPosition( int step )
{
	return step * ticksPerTact() / stepsPerTact();
}