14 thoughts on “Manual: AudioOutput”

1. Pingback: Processing brain pain « Carina Westling

2. Hello , I’m trying to output from my souncard ( a 8 channells out , fireface 800) a set of 5 sounds that should exit from audio autput 1–3-4–5 in different times, using processing, I tryied with audioOutput ,but it works with the sinewave in the code but not if I call a sample from my pc. Any suggestion?

3. It should work with AudioSample, as well, as long as you call setOutputMixer before asking for the sample, as you must do before obtaining an AudioOutput.

4. hum, now I try , many many thanks!

5. so , with the sine in the sketch of minim it works , I can move between the channels ,but I can’t play a selected file audio from my disk
   this the last I tryed , Can somebody pleeeease help me?

   /**
   * This sketch demonstrates how to use the setOutputMixer
   * method of Minim in conjunction with the getLineOut
   * method. By accessing the Mixer objects of Javasound, you can find one that
   * corresponds to the output mixer of the sound device of your choice. You can
   * then set this Mixer as the one that should use when creating an AudioOutput for you.
   * This Mixer will also be used when obtaining outputs for AudioPlayers, AudioSamples,
   * and any other classes that result in sound being ouput to your speakers.
   *
   * This sketch uses controlP5 for the GUI, a user-contributed Processing library.
   */

   import ddf.minim.*;
   // need signals package for SineWave

   import ddf.minim.signals.*;
   import controlP5.*;
   AudioSample kick;
   AudioSample snare;

   // need to import this so we can use Mixer and Mixer.Info objects
   import javax.sound.sampled.*;

   Minim minim;
   AudioOutput out;
   // an array of info objects describing all of
   // the mixers the AudioSystem has. we’ll use
   // this to populate our gui scroll list and
   // also to obtain an actual Mixer when the
   // user clicks on an item in the list.
   Mixer.Info[] mixerInfo;

   // a signal for our output
   SineWave sine;

   ControlP5 gui;

   void setup()
   {
   size(512, 200, P3D);

   minim = new Minim(this);
   gui = new ControlP5(this);

   ScrollList mixers = gui.addScrollList(“Mixers”, 10, 10, 475, 280);
   mixers.setLabel(“Choose A Mixer”);

   mixerInfo = AudioSystem.getMixerInfo();

   for(int i = 0; i < mixerInfo.length; i++)
   {
   controlP5.Button b = mixers.addItem("item"+i, i);
   b.setLabel(mixerInfo[i].getName());
   }

   sine = new SineWave(220, 0.3, 44100);

   }

   void draw()
   {
   background(0);

   //gui.draw();

   if ( out != null )
   {
   stroke(255);
   // draw the waveforms
   for(int i = 0; i < out.bufferSize() – 1; i++)
   {
   line(i, 50 + out.left.get(i)*50, i+1, 50 + out.left.get(i+1)*50);
   line(i, 150 + out.right.get(i)*50, i+1, 150 + out.right.get(i+1)*50);
   }
   }
   }

   public void controlEvent(ControlEvent theEvent)
   {
   int mixerIndex = (int)theEvent.controller().value();

   println("User chose " + theEvent.controller().label());
   println("Using mixer info " + mixerInfo[mixerIndex].getName());

   Mixer mixer = AudioSystem.getMixer(mixerInfo[mixerIndex]);

   minim.setOutputMixer(mixer);
   // load BD.wav from the data folder
   kick = minim.loadSample("file1.wav", 2048);
   if ( kick == null ) println("Didn't get kick!");
   // load SD.wav from the data folder
   snare = minim.loadSample("file2.wav", 2048);
   if ( snare == null ) println("Didn't get snare!");

   if ( out != null )
   {
   out.close();
   }

   out = minim.getLineOut(Minim.STEREO);

   if ( out != null )
   {
   snare.trigger();
   }
   }
   void keyPressed()
   {
   if ( key == 's' ) snare.trigger();
   if ( key == 'k' ) kick.trigger();
   }

   void stop()
   { // always close Minim audio classes when you are done with them
   kick.close();
   snare.close();
   // always close Minim audio classes when you are done with them
   if ( out != null )
   {
   out.close();
   }
   minim.stop();

   super.stop();
   }

6. Hi guys,

   Just had to complete a quick project that required different mp3 files playing to different sound channels. Processing can accomplish this, here’s how I solved it:

   import ddf.minim.*;
   import ddf.minim.signals.*;
   import javax.sound.sampled.*;

   Minim minim1;
   Minim minim2;

   AudioOutput out1;
   AudioOutput out2;

   AudioPlayer song1;
   AudioPlayer song2;

   Mixer.Info[] mixerInfo;

   void setup()
   {
   size(512, 256);

   minim1 = new Minim(this);
   minim2 = new Minim(this);

   //–GET THE LIST OF AVAILABLE MIXERS
   mixerInfo = AudioSystem.getMixerInfo();

   println(AudioSystem.getMixerInfo());

   //–SELECT A MIXER BASED ON THE INDEX IN THE mixerInfo ARRAY
   mixer1 = AudioSystem.getMixer(mixerInfo[1]);
   mixer2 = AudioSystem.getMixer(mixerInfo[2]);

   minim1.setOutputMixer(mixer1);
   minim2.setOutputMixer(mixer2);

   out1 = minim1.getLineOut(Minim.STEREO);
   out2 = minim2.getLineOut(Minim.STEREO);

   song1 = minim1.loadFile(“YOUR SONG FILE.mp3″);
   song2 = minim2.loadFile(“YOUR SONG FILE.mp3″);

   song1.play();
   song2.play();
   }

   void stop()
   {
   //–ALWAYS CLOSE THE SONG
   song1.close();
   song2.close();

   //–ALWAYS STOP THE MINIM
   minim1.stop();
   minim2.stop();

   //–CLOSE THE OUT CHANNEL
   out1.close();
   out2.close();

   //–ALWATSYS STOP .super()
   super.stop();
   }

   I’ve cut down the code to past here so may not work first time.

7. Yah, this looks like it will work fine. You could also do the same thing with a single Minim object by setting the output mixer before each call to getLineOut.

8. hello, has anyone ever tried playing and recording sound with the ESI MAYA 44?

   It doesn’t accept getLineOut(Minim.STEREO); or getLineOut(Minim.MONO); because (this is what I think) it has 4 channel analog line outputs/inputs, which are neither MONO or STEREO, but just channel numbers..

9. If that’s the case, you could try passing 4 as the argument to getLineOut. Minim.MONO and Minim.STEREO are simply named variables to make the function call more clear, but what you are specifying is the number of channels you want your output to have. Typically people aren’t on systems that can provide four-channel output, so I didn’t bother creating a Minim.QUAD constant.

10. Yes, I tried passing 4 to getLineOut. But i receive this ERROR:
    ==== JavaSound Minim Error ====
    ==== Unable to return a SourceDataLine: unsupported format – PCM_SIGNED 44100.0 Hz, 16 bit, 4 channels, 8 bytes/frame, little-endian

    === Minim Error ===
    === Minim.getLineOut: attempt failed, could not secure a LineOut.

    Not setting the OutputMixer with Minim and setting the soundcard as output in the systempreferences, I can use Minim.MONO and Minim.STEREO on two channels. But with setting the mixer with minim.setOutputMixer to the MAYA44, I get an ERROR in any cases.

11. Tried above examples. Get an error on line Mixer.Info[] mixerInfo;

    Cannot find a class or type named “Mixer”.

12. Solved. I had to add import javax.sound.sampled.*;

    However, while setting a mixer works with a sine wave, as soon as I use an AudioPlayer, it says – line unsupported.

13. ==== Unable to return a SourceDataLine: unsupported format – PCM_SIGNED 44100.0 Hz, 16 bit, 4 channels, 8 bytes/frame, little-endian

14. Hey folks, you will be much better served by taking this kind of conversation to the Processing forums: http://forum.processing.org