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git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1021 0778d3d1-df1d-0410-868b-ea421aaaa00d
155 lines
3.2 KiB
C++
155 lines
3.2 KiB
C++
/*
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* midi_time.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) 2004-2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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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 "types.h"
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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 midiTime
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{
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public:
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inline midiTime( const tact _tact, const tick _ticks ) :
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m_ticks( _tact * s_ticksPerTact + _ticks )
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{
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}
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inline midiTime( const tick _ticks = 0 ) :
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m_ticks( _ticks )
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{
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}
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inline midiTime( const midiTime & _t ) :
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m_ticks( _t.m_ticks )
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{
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}
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inline midiTime toNearestTact( void ) const
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{
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if( m_ticks % s_ticksPerTact >= s_ticksPerTact/2 )
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{
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return( ( getTact() + 1 ) * s_ticksPerTact );
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}
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return( getTact() * s_ticksPerTact );
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}
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inline midiTime & operator=( const midiTime & _t )
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{
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m_ticks = _t.m_ticks;
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return( *this );
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}
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inline midiTime & operator+=( const midiTime & _t )
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{
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return( *this = static_cast<int>( *this ) +
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static_cast<int>( _t ) );
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}
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inline midiTime & operator-=( const midiTime & _t )
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{
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return( *this = static_cast<int>( *this ) -
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static_cast<int>( _t ) );
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}
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inline tact getTact( void ) const
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{
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return( m_ticks / s_ticksPerTact );
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}
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inline tact nextFullTact( void ) const
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{
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if( m_ticks % s_ticksPerTact == 0 )
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{
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return( m_ticks / s_ticksPerTact );
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}
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return( m_ticks / s_ticksPerTact + 1 );
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}
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inline void setTicks( tick _t )
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{
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m_ticks = _t;
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}
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inline tick getTicks( void ) const
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{
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return( m_ticks );
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}
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inline operator int( void ) const
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{
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return( m_ticks );
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}
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// calculate number of frame that are needed this time
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inline f_cnt_t frames( const float _frames_per_tick ) const
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{
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if( m_ticks >= 0 )
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{
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return( static_cast<f_cnt_t>( m_ticks *
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_frames_per_tick ) );
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}
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return( 0 );
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}
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static inline midiTime fromFrames( const f_cnt_t _frames,
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const float _frames_per_tick )
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{
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return( midiTime( static_cast<int>( _frames /
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_frames_per_tick ) ) );
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}
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static tick ticksPerTact( void )
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{
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return( s_ticksPerTact );
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}
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static int stepsPerTact( void )
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{
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return( ticksPerTact() / DefaultBeatsPerTact );
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}
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static void setTicksPerTact( tick _tpt )
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{
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s_ticksPerTact = _tpt;
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}
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private:
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tick m_ticks;
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static tick s_ticksPerTact;
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} ;
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#endif
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