Multiple Audio Lines

Question

hi all,
Are there any open source projects out there that will show us ways to implement multiple audio lines and allow manipulation of each audio line seperately? e.g volume, pan etc??
Is anyone working on a project that they would post??
I have been working on a project which has 8 tracks, i have it playing the 8 tracks of audio but i am simply calling the same play function 8 times with a different file name each time. I use the play method described in the JavaAlmanac.
If anyone has a project in development or otherwise, i would be very grateful if they would be able to post it here!! I'm sure it will be of benefit to them aswell as everyone else.
cheers,
RC

Answer 1

hello again everyone,
As no one made any replys to this topic, i will now show you what i have ended up doing to create my multiple track audio sequencer.
Its not the best in terms of "smart code" but it works, and since i have a deadline for this project, i am happy to get it working no matter what way the code is structured.
i simply used this file
import java.awt.*;
import javax.sound.sampled.*;
import java.io.*;
public class AudioTrack0Handler
     boolean mute = false;
     String fileName;
     int loop;
     Clip clip;
     public void play(String file, int loops )
               fileName = file;
               loop = loops;
               try{
               System.out.println("Play method called file..." + fileName);
               AudioInputStream stream = AudioSystem.getAudioInputStream(new File("C:\\java\\code\\Audio\\" + fileName ));
               //AudioInputStream stream = AudioSystem.getAudioInputStream(new File("1.wav"));
               // At present, ALAW and ULAW encodings must be converted
               // to PCM_SIGNED before it can be played
               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);        // big endian
                    stream = AudioSystem.getAudioInputStream(format, stream);
               // Create the clip
               DataLine.Info info= new DataLine.Info(
                    Clip.class, stream.getFormat(), ((int)stream.getFrameLength()*format.getFrameSize()));
               clip = (Clip) AudioSystem.getLine(info);
               clip.open(stream);
               // Start playing
               clip.loop(loop);
               //clip.stop();
               } catch (IOException e) { e.printStackTrace();
               } catch (LineUnavailableException e) {  e.printStackTrace();
               } catch (UnsupportedAudioFileException e) { e.printStackTrace();}
     public void stopAudio()
          clip.stop();
          clip.flush();
     public void muteAudio()
          /*Control[] ctrl = clip.getControls();
          for (int i=0; i < ctrl.length; i++)
               System.out.println(ctrl);
          FloatControl gainControl = (FloatControl)clip.getControl(FloatControl.Type.MASTER_GAIN);
          //double gain = .5D; // number between 0 and 1 (loudest)
          //float dB = (float)(Math.log(gain)/Math.log(10.0)*20.0);
          switch((int)gainControl.getValue())
                         case 0:
                         gainControl.setValue(-80);
                         break;
                         case -80:
                         gainControl.setValue(0);
                         break;
and created it eight times for 8 audio tracks. i call each track seperately when i need to access the methods. With the stop method and mute method, it also allows me to stop all tracks or mute/unmute individual ones during playback.
In parts This is a primitve way of doing it (i think) but it will remain here as a guide for anyone who finds it!
cheers,
RC