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/***************************************************************************/
/*                                                                         */
/* (c) Copyright IBM Corp. 2001  All rights reserved.                      */
/*                                                                         */
/* This sample program is owned by International Business Machines         */
/* Corporation or one of its subsidiaries ("IBM") and is copyrighted       */
/* and licensed, not sold.                                                 */
/*                                                                         */
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/* using, marketing or distributing programs that include or are           */
/* derivative works of the sample program.                                 */
/*                                                                         */
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/* its derivatives.                                                        */
/*                                                                         */
/* Each copy of any portion of this sample program or any derivative       */
/* work,  must include the above copyright notice and disclaimer of        */
/* warranty.                                                               */
/*                                                                         */
/***************************************************************************/

/***************************************************************************/
/*                                                                         */
/* This file accompanies the article "Understanding and using Java MIDI    */
/* audio." This article was published in the Special Edition 2001 issue    */
/* of the IBM DeveloperToolbox Technical Magazine at                       */
/* http://www.developer.ibm.com/devcon/mag.htm.                            */
/*                                                                         */
/***************************************************************************/

//------------------------------------------------------------------------
// File Name:     MidiPlay 
// Description:   Play midi or rmf files from the command line.
//------------------------------------------------------------------------

import   java.io.BufferedInputStream;
import   java.io.File;
import   java.io.FileInputStream;
import   java.io.InputStream;
import   java.io.FileNotFoundException;
import   java.io.IOException;

import   javax.sound.midi.*;
import   javax.sound.midi.MetaEventListener;
import   javax.sound.midi.MetaMessage;
import   javax.sound.midi.MidiSystem;
import   javax.sound.midi.Sequencer;
import   javax.sound.midi.InvalidMidiDataException;
import   javax.sound.midi.MidiUnavailableException;

/**
  * MidiPlay
  * Play midi or rmf files from the command line.
  * @author Dan Becker
  */
public class MidiPlay implements MetaEventListener {
   public static Sequencer sequencer;
   public static String [] playList;
   public static int currentPlay;

   /** Play given arguments as file names. */
   public static void main( String [] args ) throws Exception {
        if ( args.length < 1 ) {
            System.out.println( "Usage: java MidiPlay [fileName]*" );
            System.exit( 1 );
        }
        playList = args;
        System.out.println( "MidiPlay playlist:" );
        for ( int i = 0; i< args.length; i++ )
           System.out.println( "   " + playList[ i ] );

        sequencer = MidiSystem.getSequencer(); // throws MidiUnavailableException
        sequencer.open();
        sequencer.addMetaEventListener( new MidiPlay() );

        System.out.println( "Playing " + playList[ currentPlay ] );
        playStream( sequencer, getBufferedStream( playList[ currentPlay++ ] ) );
    } // main

    /** Returns a buffered input stream from the given file name. */
    public static InputStream getBufferedStream( String fileName ) 
       throws FileNotFoundException {
       File  midiFile = new File( fileName );
       InputStream sequenceStream = new FileInputStream( midiFile );
       sequenceStream = new BufferedInputStream( sequenceStream );
       return sequenceStream;
    } // getStream

    /** Sets and starts play of the given midi sequence stream. */
    public static void playStream( Sequencer sequencer, InputStream sequenceStream ) 
       throws InvalidMidiDataException, IOException {

       sequencer.setSequence( sequenceStream );
       sequencer.start();
    } // playStream

    // MetaEventListener role
    public void meta( MetaMessage event ) {
       if ( event.getType() == 47 ) { // end of stream
          sequencer.stop();
 
          if ( currentPlay < playList.length ) {
             try {
                System.out.println( "Playing " + playList[ currentPlay ] );
                playStream( sequencer, getBufferedStream( playList[ currentPlay++ ] ) );
             } catch (Exception e) {
                e.printStackTrace();
                System.exit( 1 );
             } // catch
          } else {
             sequencer.close();
             System.exit( 1 );
          } /* endif */
       }
    } // meta
} // class MidiPlay
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