How to manipulate a thread?

[sakonpure6]

I googled a tutorial on playing sounds, and therefore I have developed this class, and when I use it I create a new Thread . This is how I do it:

PlaySound.sound = new File("Music/Gman_end.wav");
						new Thread(PlaySound.play).start();

Now is there a way to manipulate this thread? Because I have functions like mute and volume that I would like to apply to the playing sound file in the thread. Thank you for your time.

package Game;
 
import java.io.*;
import javax.sound.sampled.*;
 
public class PlaySound
{	
	static File sound;
	static boolean muted = false; // This should explain itself
	static float volume = 100.0f; // This is the volume that goes from 0 to 100
	static float pan = 0.0f; // The balance between the speakers 0 is both sides and it goes from -1 to 1
 
	static double seconds = 0.0d; // The amount of seconds to wait before the sound starts playing
 
	static boolean looped_forever_BGM = false; // It will keep looping forever if this is true
 
	static int loop_times = 0; // Set the amount of extra times you want the sound to loop (you don't need to have looped_forever set to true)
	static int loops_done = 0; // When the program is running this is counting the times the sound has looped so it knows when to stop
 
	final static Runnable play = new Runnable() // This Thread/Runnabe is for playing the sound
	{
		public void run()
		{
			try
			{
				// Check if the audio file is a .wav file
				if (sound.getName().toLowerCase().contains(".wav"))
				{
					AudioInputStream stream = AudioSystem.getAudioInputStream(sound);
 
					AudioFormat format = stream.getFormat();
 
					if (format.getEncoding() != AudioFormat.Encoding.PCM_SIGNED)
					{
						format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
								format.getSampleRate(),
								format.getSampleSizeInBits() * 2,
								format.getChannels(),
								format.getFrameSize() * 2,
								format.getFrameRate(),
								true);
 
						stream = AudioSystem.getAudioInputStream(format, stream);
					}
 
					SourceDataLine.Info info = new DataLine.Info(
							SourceDataLine.class,
							stream.getFormat(),
							(int) (stream.getFrameLength() * format.getFrameSize()));
 
					SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info);
					line.open(stream.getFormat());
					line.start();
 
					// Set Volume
					FloatControl volume_control = (FloatControl) line.getControl(FloatControl.Type.MASTER_GAIN);
					volume_control.setValue((float) (Math.log(volume / 100.0f) / Math.log(10.0f) * 20.0f));
 
					// Mute
					BooleanControl mute_control = (BooleanControl) line.getControl(BooleanControl.Type.MUTE);
					mute_control.setValue(muted);
 
					FloatControl pan_control = (FloatControl) line.getControl(FloatControl.Type.PAN);
					pan_control.setValue(pan);
 
					long last_update = System.currentTimeMillis();
					double since_last_update = (System.currentTimeMillis() - last_update) / 1000.0d;
 
					// Wait the amount of seconds set before continuing
					while (since_last_update < seconds)
					{
						since_last_update = (System.currentTimeMillis() - last_update) / 1000.0d;
					}
 
					//System.out.println("Playing!");
 
					int num_read = 0;
					byte[] buf = new byte[line.getBufferSize()];
 
					while ((num_read = stream.read(buf, 0, buf.length)) >= 0)
					{
						int offset = 0;
 
						while (offset < num_read)
						{
							offset += line.write(buf, offset, num_read - offset);
						}
					}
 
					line.drain();
					line.stop();
 
					if (looped_forever_BGM)
					{
						new Thread(play).start();
					}
					else if (loops_done < loop_times)
					{
						loops_done++;
						new Thread(play).start();
					}
				}
			}
			catch (Exception ex) { ex.printStackTrace(); }
		}
	};
 
	public void stop(){
		muted = true;
		//new Thread(play).start();
	}
 
}

[Norm]

Have you read the API doc for the Thread class? It shows the constructors and methods the class has that be used to "manipulate" the thread.

All code executes on some thread. There are lots of thread being executed when a java program executes.
The jvm uses one to start a program's execution. The jvm uses another thread to control the updating of the GUI. A program can create its own threads that can be used to execute methods in some class.

is there a way to manipulate this thread

Please explain what "manipulate" means? One thread can change the value of a variable that can be seen by other threads while they are executing.

[sakonpure6]

Please explain what "manipulate" means? One thread can change the value of a variable that can be seen by other threads while they are executing.

I want to set the variable muted to true in the class PlaySound so the music file playing would stop.

[Norm]

The code should be able to do that.

[sakonpure6]

The code should be able to do that.

but how do i do it? I tried doing PlaySound.mute = true; but it does not work? how would you do it?

[Norm]

it does not work?

Please explain. Post some code that can be executed for testing.

[sakonpure6]

I believe the code is not executed or perhaps not applied to the specific thread because the music keeps on playing!

[Norm]

Add a println() statement that prints out the value of the variable to see what each thread sees when it executes.

[sakonpure6]

Here is the main.java

import java.io.File;
 
public class main {
 
	public static void main(String[] args) {
 
		PlaySound.sound = new File("res/music.wav");
		new Thread(PlaySound.play).start();
		System.out.println(PlaySound.muted);
		try{
		Thread.sleep(5000);
		}catch(Exception e){}
 
		PlaySound.muted = true;
		System.out.println(PlaySound.muted);
	}
 
}

The PlaySound class

import java.io.*;
import javax.sound.sampled.*;
 
public class PlaySound
{
 
	static File sound;
	static boolean muted = false; // This should explain itself
	static float volume = 100.0f; // This is the volume that goes from 0 to 100
	static float pan = 0.0f; // The balance between the speakers 0 is both sides and it goes from -1 to 1
 
	static double seconds = 0.0d; // The amount of seconds to wait before the sound starts playing
 
	static boolean looped_forever = false; // It will keep looping forever if this is true
 
	static int loop_times = 0; // Set the amount of extra times you want the sound to loop (you don't need to have looped_forever set to true)
	static int loops_done = 0; // When the program is running this is counting the times the sound has looped so it knows when to stop
 
	final static Runnable play = new Runnable() // This Thread/Runnabe is for playing the sound
	{
		public void run()
		{
			try
			{
				// Check if the audio file is a .wav file
				if (sound.getName().toLowerCase().contains(".wav"))
				{
					AudioInputStream stream = AudioSystem.getAudioInputStream(sound);
 
					AudioFormat format = stream.getFormat();
 
					if (format.getEncoding() != AudioFormat.Encoding.PCM_SIGNED)
					{
						format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
								format.getSampleRate(),
								format.getSampleSizeInBits() * 2,
								format.getChannels(),
								format.getFrameSize() * 2,
								format.getFrameRate(),
								true);
 
						stream = AudioSystem.getAudioInputStream(format, stream);
					}
 
					SourceDataLine.Info info = new DataLine.Info(
							SourceDataLine.class,
							stream.getFormat(),
							(int) (stream.getFrameLength() * format.getFrameSize()));
 
					SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info);
					line.open(stream.getFormat());
					line.start();
 
					// Set Volume
					FloatControl volume_control = (FloatControl) line.getControl(FloatControl.Type.MASTER_GAIN);
					volume_control.setValue((float) (Math.log(volume / 100.0f) / Math.log(10.0f) * 20.0f));
 
					// Mute
					BooleanControl mute_control = (BooleanControl) line.getControl(BooleanControl.Type.MUTE);
					mute_control.setValue(muted);
 
					FloatControl pan_control = (FloatControl) line.getControl(FloatControl.Type.PAN);
					pan_control.setValue(pan);
 
					long last_update = System.currentTimeMillis();
					double since_last_update = (System.currentTimeMillis() - last_update) / 1000.0d;
 
					// Wait the amount of seconds set before continuing
					while (since_last_update < seconds)
					{
						since_last_update = (System.currentTimeMillis() - last_update) / 1000.0d;
					}
 
					System.out.println("Playing!");
 
					int num_read = 0;
					byte[] buf = new byte[line.getBufferSize()];
 
					while ((num_read = stream.read(buf, 0, buf.length)) >= 0)
					{
						int offset = 0;
 
						while (offset < num_read)
						{
							offset += line.write(buf, offset, num_read - offset);
						}
					}
 
					line.drain();
					line.stop();
 
					if (looped_forever)
					{
						new Thread(play).start();
					}
					else if (loops_done < loop_times)
					{
						loops_done++;
						new Thread(play).start();
					}
				}
			}
			catch (Exception ex) { ex.printStackTrace(); }
		}
	};
}

However, after 5 seconds, the music keeps on playing even though I muted it. The value of muted does change, but music keeps on playing.

[Norm]

Is the value of the variable changed? How does changing the value of a variable cause the music to be muted?

[sakonpure6]

..I don't think it affects the code until the same Thread is recalled where now muted = falsed .

[Norm]

When is the variable's value changed? When is that new value used to change the behavior of the executing thread?