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

---

src/jdkmidi_manager.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/manager.h"

namespace jdkmidi
{
  
  
  MIDIManager::MIDIManager(
    MIDIDriver *drv,
    MIDISequencerGUIEventNotifier *n,
    MIDISequencer *seq_
    ) 
    :
    driver(drv),
    sequencer(seq_),
    sys_time_offset(0),
    seq_time_offset(0),
    play_mode(false),
    stop_mode(true),
    notifier( n ),
    repeat_play_mode(false),
    repeat_start_measure(0),
    repeat_end_measure(0)
  {
    driver->SetTickProc( this );
  } 
  
  MIDIManager::~MIDIManager() 
  {
  } 
  
  
  void MIDIManager::Reset() 
  {
    SeqStop();
    sys_time_offset = 0;
    seq_time_offset = 0;
    play_mode = false;
    stop_mode = true;
    
    if( notifier )
    {
      notifier->Notify( sequencer, MIDISequencerGUIEvent( MIDISequencerGUIEvent::GROUP_ALL ) );
    }
  } 
  
  
// to set and get the current sequencer
  void MIDIManager::SetSeq( MIDISequencer *seq ) 
  {
    if( notifier )
    {
      notifier->Notify( sequencer, MIDISequencerGUIEvent( MIDISequencerGUIEvent::GROUP_ALL ) );
    }
    
    sequencer = seq;
  } 
  
  
  MIDISequencer *MIDIManager::GetSeq() 
  {
    return sequencer;
  } 
  
  const MIDISequencer *MIDIManager::GetSeq() const 
  {
    return sequencer;
  } 
  
  
// to set and get the system time offset
  void MIDIManager::SetTimeOffset( unsigned long off ) 
  {
    sys_time_offset = off;
  } 
  
  unsigned long MIDIManager::GetTimeOffset() 
  {
    return sys_time_offset;
  } 
  
// to set and get the sequencer time offset
  void MIDIManager::SetSeqOffset( unsigned long seqoff ) 
  {
    seq_time_offset = seqoff;
  } 
  
  unsigned long MIDIManager::GetSeqOffset() 
  {
    return seq_time_offset;
  } 
  
// to manage the playback of the sequencer
  void MIDIManager::SeqPlay() 
  {
    stop_mode = false;
    play_mode = true;
    
    if( notifier )
    {
      notifier->Notify(  sequencer,
                         MIDISequencerGUIEvent(
                           MIDISequencerGUIEvent::GROUP_TRANSPORT,
                           0,
                           MIDISequencerGUIEvent::GROUP_TRANSPORT_MODE
                           ) );
    }
    
  } 
  
// to manage the repeat playback of the sequencer
  void MIDIManager::SetRepeatPlay(
    bool flag,
    unsigned long start_measure,
    unsigned long end_measure
    ) 
  {
    // shut off repeat play while we muck with values
    repeat_play_mode = false;
    repeat_start_measure = start_measure;
    repeat_end_measure = end_measure;
    
    // set repeat mode flag to how we want it.
    repeat_play_mode = flag;
  } 
  
  void MIDIManager::SeqStop() 
  {
    play_mode = false;
    stop_mode = true;
    
    if( notifier )
    {
      notifier->Notify( sequencer,
                        MIDISequencerGUIEvent(
                          MIDISequencerGUIEvent::GROUP_TRANSPORT,
                          0,
                          MIDISequencerGUIEvent::GROUP_TRANSPORT_MODE
                          ) );
    }
    
  } 
  
// status request functions
  bool MIDIManager::IsSeqPlay() const 
  {
    return play_mode;
  } 
  
  bool MIDIManager::IsSeqStop() const 
  {
    return stop_mode;
  } 
  
  bool MIDIManager::IsSeqRepeat() const
  {
    return repeat_play_mode && play_mode;
  }
  
  void MIDIManager::TimeTick( unsigned long sys_time_ ) 
  {
    if( play_mode )
    {
      TimeTickPlayMode(sys_time_);
    }
    else if( stop_mode )
    {
      TimeTickStopMode(sys_time_);
    }
    
    
  } 
  
  void MIDIManager::TimeTickPlayMode( unsigned long sys_time_ ) 
  {
    double sys_time = (double)sys_time_ - (double)sys_time_offset;
    float next_event_time = 0.0;
    int ev_track;
    MIDITimedBigMessage ev;
    
    // if we are in repeat mode, repeat if we hit end of the repeat region
    if( repeat_play_mode
        && sequencer->GetCurrentMeasure()>=repeat_end_measure
      )
    {
      // yes we hit the end of our repeat block
      // shut off all notes on
      driver->AllNotesOff();
      
      // now move the sequencer to our start position
      
      sequencer->GoToMeasure( repeat_start_measure );
      
      // our current raw system time is now the new system time offset
      
      sys_time_offset = sys_time_;
      
      sys_time = 0;
      
      // the sequencer time offset now must be reset to the
      // time in milliseconds of the sequence start point
      
      seq_time_offset = (unsigned long)sequencer->GetCurrentTimeInMs();
    }
    
    // find all events that exist before or at this time,
    // but only if we have space in the output queue to do so!
    
    // also limit ourselves to 100 midi events max.
    
    int output_count=100;
    
    while(
      sequencer->GetNextEventTimeMs( &next_event_time )
      && (next_event_time-seq_time_offset)<=sys_time
      && driver->CanOutputMessage()
      && (--output_count)>0
      )
    {
      // found an event! get it!
      
      if( sequencer->GetNextEvent( &ev_track, &ev ) )
      {
        // ok, tell the driver the send this message now
        
        driver->OutputMessage( ev );
      }
    }
    
    
    
    
    // auto stop at end of sequence
    
    if( !sequencer->GetNextEventTimeMs( &next_event_time ) )
    {
      // no events left
      stop_mode = true;
      play_mode = false;
      
      if( notifier )
      {
        notifier->Notify( sequencer,
                          MIDISequencerGUIEvent(
                            MIDISequencerGUIEvent::GROUP_TRANSPORT,
                            0,
                            MIDISequencerGUIEvent::GROUP_TRANSPORT_MODE
                            ) );
        
        notifier->Notify( sequencer,
                          MIDISequencerGUIEvent(
                            MIDISequencerGUIEvent::GROUP_TRANSPORT,
                            0,
                            MIDISequencerGUIEvent::GROUP_TRANSPORT_ENDOFSONG
                            ) );
        
      }
    }
    
  } 
  
  void MIDIManager::TimeTickStopMode( unsigned long sys_time_ ) 
  {
  } 
}