jdkmidi class library documentation
Copyright © 2004 J.D. Koftinoff Software, Ltd.
Released under the GNU General Public License (GPL)

---

include/jdkmidi/tempo.h

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/*
 *  libjdkmidi-2004 C++ Class Library for MIDI
 *
 *  Copyright (C) 2004  J.D. Koftinoff Software, Ltd.
 *  www.jdkoftinoff.com
 *  jeffk@jdkoftinoff.com
 *
 *  *** RELEASED UNDER THE GNU GENERAL PUBLIC LICENSE (GPL) April 27, 2004 ***
 *
 *  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; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
/*
**  Copyright 1986 to 1998 By J.D. Koftinoff Software, Ltd.
**
**  All rights reserved.
**
**  No one may duplicate this source code in any form for any reason
**  without the written permission given by J.D. Koftinoff Software, Ltd.
**
*/

#ifndef _JDKMIDI_TEMPO_H
#define _JDKMIDI_TEMPO_H

//
// This class makes it easy to deal with Tempos as fixed point
// numbers.
//
// The actual tempo is stored times 256 for 1/256 bpm accuracy.
//
// The default operator int() etc., automatically convert the
// fixed point number so the value is in normal beats per minutes.
// 
//

#include "jdkmidi/midi.h"

namespace jdkmidi
{
  
  class  MIDITempo 
    {
    public:
      MIDITempo()     
        { 
          tempo=120<<8;     
        }
      MIDITempo( int a )    
        { 
          tempo=(unsigned long)a << 8;    
        }
      MIDITempo( unsigned int a )   
        { 
          tempo=(unsigned long)a << 8;    
        }
      MIDITempo( long a )   
        { 
          tempo=(unsigned long)a << 8;    
        }
      MIDITempo( unsigned long a )    
        { 
          tempo=a << 8;   
  }
      MIDITempo( float a )    
        { 
          tempo=(unsigned long) (a*256.0);  
        }
      MIDITempo( const MIDITempo &a ) 
        { 
          tempo=a.GetFullTempo(); 
        }
      
      operator short ()   
        { 
          return (short)((tempo+0x80)>>8);
        }
      operator unsigned short ()  
        { 
          return (unsigned short)((tempo+0x80)>>8);
        }
      
      operator int ()   
        { 
          return (int)((tempo+0x80)>>8);
        }
      operator unsigned int ()  
        { 
          return (unsigned int)((tempo+0x80)>>8);
        }
      operator long ()  
        { 
          return (long)((tempo+0x80)>>8);
        }
      operator unsigned long () 
        { 
          return (unsigned long)((tempo+0x80)>>8);
        }
      operator float () 
        { 
          return (float)tempo / 256.0f; 
        }
      void  operator = (unsigned short a )  
        { 
          tempo=(unsigned long)a << 8;    
        }
      void  operator = (short a )   
        { 
          tempo=(unsigned long)a << 8;    
        }
      
      void  operator = (unsigned int a )  
        { 
          tempo=(unsigned long)a << 8;    
        }
      void  operator = (int a )   
        { 
          tempo=(unsigned long)a << 8;    
        }
      void  operator = (unsigned long a )   
        { 
          tempo=(unsigned long)a << 8;    
        }
      void  operator = (long a )  
        { 
          tempo=(unsigned long)a << 8;    
        }
      
      void  operator = (float a ) 
        { 
          tempo=(unsigned long)(a*256.0); 
        }
      
      unsigned long GetFullTempo() const  
        { 
          return tempo;     
        }
      void  SetFullTempo( unsigned long v ) 
        { 
          tempo=v;      
        }
      
      unsigned long GetMIDIFileTempo()
        { 
          if(tempo) return (60000000L/256)/tempo;
        else 
          return (60000000L/256)/(120*256); 
        }
      
    protected:
      unsigned long tempo;
    };
  
}

#endif