/*
 * File    : FalseClip.java
 * Created : 04-aug-2004 16:26
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya                                        
 *
 * 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 (see the LICENSE file).
 */

package edu.xtec.jclic.media;

import edu.xtec.jclic.bags.MediaBag;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.SourceDataLine;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.cat)
 * @version 13.08.28
 */
public class FalseClip implements PseudoClip{
    
    private AudioInputStream ais;
    private AudioFormat af;
    private MediaBag mb;
    private String mediaFileName;
    private PlayThread playThread;
    private int loopCount;
    
    /** Creates a new instance of FalseClip */
    private FalseClip(MediaBag mb, String mediaFileName) throws Exception {
        this.mb=mb;
        this.mediaFileName=mediaFileName;
        af=getAudioInputStream().getFormat();
    }
    
    public static FalseClip getFalseClip(MediaBag mb, String mediaFileName) throws Exception{
        return new FalseClip(mb, mediaFileName);
    }
    
    private AudioInputStream getAudioInputStream() throws Exception{        
        if(ais==null){
            JavaSoundAudioPlayer jsap=new JavaSoundAudioPlayer();
            jsap.setDataSource(mb.getMediaDataSource(mediaFileName));
            ais=jsap.ais;
            if(ais==null)
                throw new Exception("Unable to open audio data!");
        }
        return ais;        
    }
    
    public void close() {
        stop();
    }
    
    public javax.sound.sampled.AudioFormat getFormat() {
        return af;
    }
    
    public boolean isActive() {
        return (playThread!=null && playThread.isAlive());
    }
    
    public boolean isOpen() {
        return ais!=null;
    }
    
    public boolean isRunning() {
        return isActive();        
    }
    
    public void loop(int count) throws Exception{
        start();
        loopCount=count;
    }
    
    public void open() throws Exception {
        getAudioInputStream();
    }
    
    public void setFramePosition(int frames) {
        // ignore
    }
    
    public void setLoopPoints(int start, int end) {
        // ignore
    }
    
    public void start() throws Exception{
        if(playThread==null){
            loopCount=0;
            playThread=new PlayThread();
            playThread.start();
        }            
    }
    
    public void stop() {
        if(playThread!=null){
            if(playThread.isAlive()){
                playThread.running=false;
                while(playThread!=null){
                    Thread.yield();
                }
            }
            else{
                playThread=null;
                ais=null;
            }
        }
    }
        
    class PlayThread extends Thread {
        
        public boolean running;
        byte[] buf=new byte[JavaSoundAudioPlayer.INTERNAL_BUFFER_SIZE];
        SourceDataLine line = null;
        
        public PlayThread() throws Exception{
            running=false;
            getAudioInputStream();
            DataLine.Info info = new DataLine.Info(SourceDataLine.class, af);
            line = (SourceDataLine)AudioSystem.getLine(info);
            if(line!=null)
                line.open(af);
        }
        
        @Override
        public void run(){
            if(line!=null){
                running=true;
                int nBytesRead = 0;
                try{
                    line.start();
                    while (running && nBytesRead >=0) {
                        nBytesRead = ais.read(buf, 0, buf.length);
                        if (nBytesRead >= 0) {
                            int nBytesWritten = line.write(buf, 0, nBytesRead);
                        }
                        Thread.yield();
                    }
                    if(running)
                        line.drain();
                    else
                        line.stop();
                } catch(Exception ex){
                    System.err.println("JavaSound playing error:\n"+ex);
                }
                line.close();
            }
            ais=null;
            playThread=null;
            if(running && loopCount!=0){
                if(loopCount>0)
                    loopCount--;
                try{
                    int lc=loopCount;
                    FalseClip.this.start();
                    loopCount=lc;
                } catch(Exception ex){
                    System.err.println("Error looping sound: "+ex);
                }
            }
            running=false;
        }
    }
    
}