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Author: matheus23 (posted 2012-06-26 12:37:13, viewed 180 times)

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package org.matheusdev.musicplayer;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.ArrayBlockingQueue;

public class MusicPlayer {
   
   public static final boolean DEBUG = true;
   
   private static class Action {
      static final int NEXT = 0;
      static final int EXIT = 1;
      int action;
      
      public Action (int aciton, String text) {
         this.action = aciton;
      }
   }
   
   private static class InputThread implements Runnable {
      RunnerThread runner;
      public InputThread(RunnerThread runner) {
         this.runner = runner;
      }
      public void run() {
         BufferedReader read = null;
         try {
            try {
               read = new BufferedReader(new InputStreamReader(System.in));
               String line;
               while ((line = read.readLine()) != null) {
                  if (line.equals("next")) {
                     runner.actions.add(new Action(Action.NEXT, null));
                  } else if (line.equals("exit")) {
                     runner.actions.add(new Action(Action.EXIT, null));
                  } else {
                     System.out.println("Could not understand that: \"" + line + "\"");
                  }
               }
            } finally {
               if (read != null) {
                  read.close();
               }
            }
         } catch (IOException e) {
            e.printStackTrace();
         }
      }
   }
   
   private static class RunnerThread implements Runnable {
      ArrayBlockingQueue<Action> actions = new ArrayBlockingQueue<Action>(100);
      Process p;
      public void run() {
         Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
            public void run() {
               if (p != null) {
                  p.destroy();
               }
            }
         }));
         Random rand = new Random();
         List<File> mp3Files = listFilesRecursive(mp3Filter, workingDir);
         System.out.println("Found songs:");
         int cut = System.getProperty("user.dir").length();
         for (int i = 0; i < mp3Files.size(); i++) {
            System.out.println(mp3Files.get(i).getAbsolutePath().substring(cut));
         }
         Thread t = new Thread(null, new InputThread(this), "input");
         t.setDaemon(true);
         t.start();
         while (true) {
            if (p != null) {
               boolean finished = true;
               try {
                  p.exitValue();
               } catch (IllegalThreadStateException e) {
                  finished = false;
               }
               if (finished) {
                  p = null;
                  actions.add(new Action(Action.NEXT, null));
               }
            }
            if (!actions.isEmpty()) {
               Action a;
               try {
                  a = actions.take();
               } catch (InterruptedException e1) {
                  continue;
               }
               switch (a.action) {
               case Action.NEXT:
                  System.out.println("Next song.");
                  if (p != null) {
                     p.destroy();
                  }
                  File newSong = mp3Files.get(Math.abs(rand.nextInt()%mp3Files.size()));
                  try {
                     String filepath = newSong.getCanonicalPath();
                     String[] commands = new String[] { "gst-launch-0.10", "playbin2", "uri=\"file://" + filepath + "\""};
                     System.out.println("Playing now: " + newSong.getName());
                     p = Runtime.getRuntime().exec(commands);
                  } catch (IOException e) {
                     e.printStackTrace();
                  }
                  break;
               case Action.EXIT:
                  System.out.println("You requested exit. Exiting.");
                  if (p != null) {
                     p.destroy();
                  }
                  return;
               }
            }
            try {
               Thread.sleep(50);
            } catch (InterruptedException e) {
               continue;
            }
         }
      }
   }
   
   public static final File workingDir = new File(System.getProperty("user.dir"));
   public static final FileFilter mp3Filter = new FileFilter() {
      public boolean accept(File pathname) {
         return !pathname.isDirectory() && pathname.getName().endsWith(".mp3");
      }
   };
   
   public static List<File> listFilesRecursive(FileFilter filter, File dir) {
      List<File> files = new ArrayList<File>();
      listFilesRecursive(files, filter, dir);
      return files;
   }
   
   public static void listFilesRecursive(List<File> toAddTo, FileFilter filter, File dir) {
      if (!dir.isDirectory()) {
         return;
      }
      File[] files = dir.listFiles();
      for (int i = 0; i < files.length; i++) {
         if (filter.accept(files[i])) {
            toAddTo.add(files[i]);
         }
         listFilesRecursive(toAddTo, filter, files[i]);
      }
   }
   
   public static void main(String[] args) {
      new Thread(null, new RunnerThread(), "runner").start();
   }

}





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