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

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src/jdkmidi_filewritemultitrack.cpp

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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
*/
#include "jdkmidi/world.h"
#include "jdkmidi/filewritemultitrack.h"

namespace jdkmidi
{
  
  
  MIDIFileWriteMultiTrack::MIDIFileWriteMultiTrack(
    const MIDIMultiTrack *mlt_,
    MIDIFileWriteStream *strm_
    )
    :
    multitrack( mlt_ ),
    writer( strm_ )
  {
  }
  
  MIDIFileWriteMultiTrack::~MIDIFileWriteMultiTrack()
  {
  }
  
  bool MIDIFileWriteMultiTrack::Write( int num_tracks, int division )
  {
    bool f=true;
    if( !PreWrite() )
    {
      return false;
    }
    
    // first, write the header.
    
    writer.WriteFileHeader( (num_tracks>0), num_tracks, division );
    
    // now write each track
    
    for( int i=0; i<num_tracks; ++i )
    {
      if( writer.ErrorOccurred() )
      {
        f=false;
        break;
      }
      
      const MIDITrack *t = multitrack->GetTrack(i);
      
      MIDIClockTime last_event_time=0;
      
      writer.WriteTrackHeader(0); // will be rewritten later
      
      if( t )
      {
        for( int event_num=0; event_num<t->GetNumEvents(); ++event_num )
        {
          const MIDITimedBigMessage *ev = t->GetEventAddress( event_num );
          if( ev && !ev->IsNoOp() )
          {
            last_event_time = ev->GetTime();
            
            if( !ev->IsDataEnd() )
            {
              writer.WriteEvent( *ev );
              
              if( writer.ErrorOccurred() )
              {
                f=false;
                break;
              }
            }
          }
        }
      }
      writer.WriteEndOfTrack(0);
      writer.RewriteTrackLength();
    }
    
    if( !PostWrite() )
    {
      return false;
    }
    
    return f;
  }
  
  
  bool MIDIFileWriteMultiTrack::PreWrite()
  {
    return true;
  }
  
  bool MIDIFileWriteMultiTrack::PostWrite()
  {
    return true;
  }
  
  
  
}