Author: David Ford

Plays background sounds for web page in random order at random intervals. Perfect for setting the mood of a page.

Features

1. Random delay factor and order add to the effect by simulating real life background noise.

2. Can be customized with any number of sounds.

3. Each sound is given a priority as to how often it plays and a delay factor to determine the relative length of silence follow the sound.

4. Playback can be paused by clicking on the applet. BackSound displays either a image or the background color may be specified.

BackSound.java

// BackSound by David Ford (c) 1999
//
// BackSound plays sounds from playlist in random order with a random interval
// between sounds. A priority is given for each sound to determine it's freqency
// A delay is given for each sound to determine the relative length of pause after
// the sound plays. Soundn will play aproximately priorityn time out of (total
// total priority).  Delay after playing soundn will be 1*delayn to 20*deyaln seconds.
// BackSound will display either a blank background of color or the image given.
// WIDTH & HEIGHTH should match the size of image if it is used. If image is used
// then color will have no effect. Play stops when the mouse is clicked on the Applet
// and resumes when the mouse is clicked again.
//
// <APPLET CODE = "BackSound.class" WIDTH=100 HEIGHT=100>
// <!--WIDTH & HEIGHT must match width & height of image if used-->
// <PARAM NAME="numsounds" VALUE="4">
// <PARAM NAME="sound1" VALUE="cat.au">
// <PARAM NAME="delay1" VALUE="3">
// <PARAM NAME="priority1" VALUE="3">
// <PARAM NAME="sound2" VALUE="dog-1.au">
// <PARAM NAME="delay2" VALUE="2">
// <PARAM NAME="priority2" VALUE="2">
// <PARAM NAME="sound3" VALUE="Gun-1.au">
// <PARAM NAME="delay3" VALUE="1">
// <PARAM NAME="priority3" VALUE="1">
// <PARAM NAME="color" VALUE="black"> // not used if image is given
// <PARAM NAME="image" VALUE="Back.gif">
//
// This Applet is my own original work. BackSound is free for distribution to
// non-commercial sites. If you would like to use this applet on anyother site then
// all I ask is that you e-mail me at Shade2020@aol.com and let me know that my work
// is appriciated. If you would like to use this applet on a commercial site then
// e-mail me and request a liscence to do so. ~ David

import	java.applet.*;
import	java.lang.Thread.*;
import	java.util.*;
import	java.net.*;
import	java.awt.*;
import	java.awt.event.*;
import	java.lang.*;

public class BackSound extends Applet implements Runnable {

int 			NumSounds;			//Number of sound clips
AudioClip Sounds[];				//Array of sounds
long			Delay[];				//Delay time after each sound
int				Priority[];			//Priority of each sound
int				TotalPriority;	//Total of all Priorties
Image			BGImage;				//background image
Color			BGColor;				//background color
Thread		Go;							//The thread to play sounds
boolean		Running = false;//Is the thread running?
boolean		Active = true;	//Has the Applet been destroyed?

	//About information.
	public String getAppletInfo() {
	return
	"BackSound - a background sound effect player.\n"
	+"Plays random sound from list in random order at random intervals.\n"
	+"Click cause sound playback to toggle.\n"
	+"version 2.0.0\n"
	+"(c) 1999 - David Ford\n\n"
	+"numsound  - Number of sounds in list\n"
	+"soundn    - .au file n\n"
	+"delayn    - pause delayn to 20 x delayn seconds after soundn\n"
	+"priorityn - play soundn this number of times from total of priorities\n"
	+"image     - graphics file to display\n"
	+"color     - background color if image not defined\n"
	+"Color may be given as rrr.ggg.bbb, rrrgggbbbb or by name";
	}
	
	String pinfo[][] = {
		{"numsounds","integer","number of sounds in list"},
		{"sound1","URL","1st sound file"},
		{"sound2","URL","2nd sound file"},
		{"...","...","repeat soundn for each sound file 1 through numsounds"},
		{"priority1","integer","play sound1 priority1 in total priorities times"},
		{"priority2","integer","play sound2 priority2 in total priorities times"},
		{"...","integer","repeat priorityn for each sound file 1 through numsounds"},
		{"delay1","long","pause delay1 to 20x delay1 seconds before playing next sound"},
		{"delay2","long","pause delay2 to 20x delay1 seconds before playing next sound"},
		{"...","long","repeat delayn for each sound file 1 through numsounds"},
		{"image","URL","image to display"},
		{"color","string","rrr.ggg.bbb where rrr = red value, ggg = green & bbb = blue"},
		{"color","integer","rrrgggbbb color value"},
		{"color","string","color name"}
	};
	
	public String[][] getParameterInfo() {
		return pinfo;
	}
	
	
	public void init () {
		int PriorityIn = 0;
		//read in the background image or color
		if (this.getParameter("image") != null) {
			BGImage =getImage(this.getCodeBase(), this.getParameter("image"));
			}
		else {
			int red;
			int blue;
			int green;
			String ColorIn;
			StringTokenizer st;
			ColorIn = this.getParameter("color");
			st = new StringTokenizer(ColorIn,".");
			//Color is not in form rrr.ggg.bbb
			if (st.countTokens() < 3) {
				//Color might be given in form rrrgggbbb
				try {BGColor = new Color(Integer.parseInt(ColorIn));}
				//Color might be given by name
				catch (NumberFormatException nfebgc) {
					BGColor = Color.getColor(ColorIn);
					setBackground(BGColor);
				}
			}
			//color is in form rrr.ggg.bbb
			//if any of these values are bad then default to 0
			else {
				try {red = Integer.parseInt(st.nextToken());}
				catch (NumberFormatException nfer) {red = 0;}
				try {green = Integer.parseInt(st.nextToken());}
				catch (NumberFormatException nfeg) {green = 0;}
				try {blue = Integer.parseInt(st.nextToken());}
				catch (NumberFormatException nfeb) {blue = 0;}
				BGColor = new Color(red, blue, green);
				setBackground(BGColor);
				}
			}
		//read the number of sounds and create the sound data arrays
		NumSounds = Integer.parseInt(this.getParameter("numsounds"));
		if (NumSounds < 1) {
			showStatus ("Invalid number of sounds");
			NumSounds = 1;
			}
		Sounds = new AudioClip[NumSounds];
		Delay = new long[NumSounds];
		Priority = new int[NumSounds];
		//get the sound data and load the sounds
		for (int i = 0; i < NumSounds; i++) {
			//Get the .au file, skip if bad
			try {Sounds[i] = getAudioClip(this.getDocumentBase(), this.getParameter("sound"+String.valueOf(i+1)));}
			catch (NegativeArraySizeException nases) {
				Delay[i] = 0;
				Priority[i] = 1;
				continue;
				}
			//Get the delay factor default to 1 if bad
			try {Delay[i] = Long.parseLong(this.getParameter("delay"+String.valueOf(i+1)));}
			catch (NumberFormatException nfed) {
				}
			if (Delay[i] == 0) Delay[i] = 1;
			//Get the priority factor default to 1 if bad
			try {PriorityIn = Integer.parseInt(this.getParameter("priority"+String.valueOf(i+1)));}
			catch (NumberFormatException nfep) {
				}
			if (PriorityIn == 0) PriorityIn = 1;
			//Increment total Priority and set priority of this
			//sound to the new total
			TotalPriority += PriorityIn;
			Priority[i] = TotalPriority;
		}
		//Listen for click and mouse enter and begin
		this.addMouseListener(new Listener());
		Running = true;
	}

	//make sure the image or background is shown & start	
	public void start() {
		repaint();
		Running = true;
		if (Go == null) {
			Go = new Thread(this);
			Go.start();
		}
//		else {
//			notify();
//		}
	}
	
	// kill the PlayThread
	public void stop() {
		Running = false;
	}
	
	
	
	// kill the PlayThread free the BGImage
	public void destroy() {
		Active = false;
		Running = false;
		Go = null;
		if (BGImage != null) {
			BGImage = null;
		}
	}
	
	// Play sounds in random order at random intervals
	public void run() {
		int			SoundNumber;		//Sounds[] index
		int			PriorityValue;	//Random Priority
		long		DelayTime;			//Delay[] index

		while (Active) {
			//Generate a random priority
			PriorityValue = (int) (java.lang.Math.random() * TotalPriority);
			if (PriorityValue == 0) PriorityValue = 1; //shouldn't happen
			//find 1st sound of equal or higher priority
			for (SoundNumber = 0; SoundNumber < NumSounds; SoundNumber++) {
				if (Priority[SoundNumber] >= PriorityValue) {
					//Set delay for this sound random 1 to 10 seconds
					//mutiplied by sounds delay factor
					DelayTime = (long) (java.lang.Math.random() * 10);
					if (DelayTime == 0) DelayTime = 1;
					DelayTime *= 1000;
					DelayTime *= Delay[SoundNumber];
					if (DelayTime == 0) DelayTime = 1000;
					//play it if it is valid, if not do nothing this pass
					try {Sounds[SoundNumber].play();}
					catch (NullPointerException npes) {
						continue;
						}
					//pause after playing the sound
					try {Thread.sleep(DelayTime);}
					catch (InterruptedException ie) {}
					break;
				}
			}
			//Check to see if the applet has been paused
//			synchronized (this) {
//				if (!Running) {
//					try { wait(); }
//						catch (InterruptedException ie) {}
//				}
//			}
			while(!Running){
			showStatus("Paused: Click to resume");
			}
		}
	}
	
	// display background color or image
	public void paint(Graphics g) {
		if (BGImage != null) {
			
			g.drawImage(this.BGImage,0,0,this);
			}
		else {
			this.setBackground(this.BGColor);
		}
	}

	class Listener extends MouseAdapter {
		//toggle pause if Mouse pressed
		public void mouseClicked(MouseEvent e) {
			if (Running) {
				//Pause if playing
				showStatus("Pausing: Click to Resume");
				Running = false;
			}
			else {
				//play if paused
				showStatus("Resuming: Click to Pause");
				start();
			}
		}
		
		//Display messege to indicate current state
		//and mouse click action.
		public void mouseEntered(MouseEvent e) {
			if (Running) {
				showStatus("Running: Click to Pause");
			}
			else {
				showStatus("Paused: Click to Resume");
			}
		}
	}
			
}

Download source from author's site
Download source code

Posted On: 30-Jun-1999

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