Mixdown output of Javasound mixer to file

Question

I'm currently using Javasound to render multiple audio files to speakers using multiple SourceDataLines obtained from the same Mixer. This allows me to easily adjust relative volumes and pan settings of the audio files during playback. Now I'd like to somehow grab the output of the Mixer and write the mixed audio to a single file. (Like a final mixdown of sorts.) Is there any way to get the raw output signal in stream form or otherwise from the Mixer? From what I can see of the TargetDataLine, it is only useful for audio capture.
Thanks,
Dan

Answer 1

I have done it, try using the Manager.createMergingDataSource() method
here is the code:
                    javax.media.Processor processors[]      = new Processor[ args.length ];
                    DataSource dataOutputSources[]           = new DataSource[ args.length ]; //arrreglo de Output DataSources
               for (int i=0; i < args.length; i++){                                             
                    MediaLocator m1 = new MediaLocator( args[i] );                    
                    try{
                         ProcessorModel pm = new MyPM( m1 );
                         processors[i] = /*Manager.createRealizedProcessor(pm);*/generaProcessor( m1 );                                                            
                         dataOutputSources[i] = processors.getDataOutput();                    
                         processors[i].start();                                                                                          
                         printProccessorInfo( processors[i] );
                         printDataSourceInfo( dataOutputSources[i] );
                    }catch(Exception e){
                         System.out.println("Error al generar input Processors " + e);
                         System.exit(-1);
               }//FOR
                    DataSource dataSourceMezcla = Manager.createMergingDataSource( dataOutputSources ); //mezclarlos                    
                    dataSourceMezcla.connect();
                    //System.out.println("content type de MEzcla = "+dataSourceMezcla.getContentType());////
                    dataSourceMezcla.start();
                    if (dataSourceMezcla == null){
                         System.out.println("No se pudieron mezclar data sources");
                         System.exit(-1);
                    }//if
               //     Processor processorOut = null;
                    try {
                         //ProcessorModel pmOut = null;                         
                    outputProcessor = generaProcessor( dataSourceMezcla ); /*Manager.createRealizedProcessor(pmOut); */
               //     ProcessorModel pm = new MyPMOut( dataSourceMezcla );
               //     outputProcessor = Manager.createRealizedProcessor( pm );
                    //System.out.println("Pm.contentDescripto = "+ pmOut.getContentDescriptor() );
                         printDataSourceInfo( dataSourceMezcla );
                         printProccessorInfo( outputProcessor );
                    }catch(Exception e){
                         System.out.println("Error al generar output Processor " + e);
                         System.exit(0);
                    DataSource dsOutput = outputProcessor.getDataOutput();
                    //------------- tocar Audios ya mezclados, crear clon de DS
                    /*DataSource dsCloneable = Manager.createCloneableDataSource(dsOutput);
                    DataSource DSclon1 = ((SourceCloneable)dsCloneable).createClone();
                    Processor processorDelClonado = ma.generaProcessor(dsOutput);
                    Player player = Manager.createPlayer( processorDelClonado.getDataOutput() );
                    player.start();
                    System.out.println( "tracks=" + outputProcessor.getTrackControls().length );////////////
                    javax.media.DataSink sink = null;
                    MediaLocator dest = new MediaLocator("file:/c:/newfile2.mp3");
                    try{
                         sink = Manager.createDataSink( dsOutput, dest );                    
                    sink.open();
                    }catch(javax.media.NoDataSinkException nd){
                         System.out.println("Error en DataSink - " + nd );
                    outputProcessor.addControllerListener(this );     
                    sink.addDataSinkListener( this );
                    System.out.println("Mezclando");
                    sink.start();
                    outputProcessor.start();
                    while (!fin) { // mientras no terminen audios
                         try {
                              Thread.currentThread().sleep(100);
                    } catch (InterruptedException ie) {
                    int count = 0;
                    if (outputProcessor != null &&     (int)(outputProcessor.getMediaTime().getSeconds()) > count) {
                              System.err.print(".");
                              count = (int)(outputProcessor.getMediaTime().getSeconds());
                    }//if
                    }//while
                    sink.close();