//-------------------------------------------------------------------------
// Filename:      track.cc
// Version:       $Id: track.cc,v 1.1.2.2 1999/06/09 10:14:05 erik Exp $
// Copyright:     Copyright (C) 1999, Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
// Author:        Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
// Description:   MIDI track class
// Created at:    Sat May 15 14:25:43 1999
// Modified by:   Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
// Modified at:   Wed May 26 23:50:59 1999
//-------------------------------------------------------------------------
// 
// 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
//

#ident "$Id: track.cc,v 1.1.2.2 1999/06/09 10:14:05 erik Exp $"

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <assert.h>

#include "track.hh"








midiTrack::midiTrack(void)
{
  events = 0;
  lastEvent = 0;
  currentEvent = 0;
  currentTime = -1L;
  nextTime = -1L;
}








midiTrack::~midiTrack(void)
{
  midiEvent *nextEvent;

  rewind();

  // delete all events
  if(currentEvent != 0)
    {
      do
	{
	  nextEvent = currentEvent->getNextEvent();
	  delete currentEvent;
	  currentEvent = nextEvent;
	}
      while(currentEvent != 0);
    }
}








void midiTrack::addEvent(midiEvent *event)
{
  // sanity check
  assert(event != 0);

  if(events == 0)
    {
      events = currentEvent = lastEvent = event;
    }
  else
    {
      lastEvent->setNextEvent(event);
      lastEvent = event;
    }

  lastEvent->setNextEvent(0);

  rewind();
}








midiEvent *midiTrack::getNextEvent(void)
{
  long int deltaTime;

  if(currentEvent != 0)
    {
      currentEvent = currentEvent->getNextEvent();

      if(currentEvent != 0)
	{
	  currentTime = nextTime;

	  deltaTime = currentEvent->getDeltaTime();
	  if(deltaTime >= 0L)
	    nextTime = currentTime + currentEvent->getDeltaTime();
	  else
	    nextTime = -1L;
	}
      else
	{
	  currentTime = nextTime = -1L;
	}
    }
  else
    {
      currentTime = nextTime = -1L;
    }

  return(currentEvent);
}








midiEvent *midiTrack::rewind(void)
{
  currentEvent = events; 
  
  if(currentEvent == 0)
    {
      currentTime = -1L;
      nextTime = -1L;
    }
  else
    {
      currentTime = 0L;
      nextTime = currentEvent->getDeltaTime();
    }
    
  return(currentEvent);
}








void midiTrack::play(midiDevice *device, midiPlayer *player)
{
  assert(device != 0);
  assert(player != 0);

  if(currentEvent != 0)
    {
      currentEvent->play(device, player);
      getNextEvent();
    }
}