core | ugens | analysis




Begins recording audio from the current record source. If recording was previously halted, and the save method was not called, samples will be appended to the end of the material recorded so far.


void beginRecord()






  * This sketch demonstrates how to use an AudioRecorder to record audio to disk
  * and then immediately play it back by creating a new FilePlayer using the AudioRecordingStream
  * returned by the save method.
  * <p> 
  * To use this sketch you need to have something plugged into the line-in on your computer.<br/>
  * Press 'r' to toggle recording on and off and the press 's' to save to disk.<br/>
  * The recorded file will be placed in the main folder of the sketch.
  * <p>
  * For more information about Minim and additional features, visit

import ddf.minim.*;
import ddf.minim.ugens.*;

Minim minim;

// for recording
AudioInput in;
AudioRecorder recorder;
boolean recorded;

// for playing back
AudioOutput out;
FilePlayer player;

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

  minim = new Minim(this);
  // get a stereo line-in: sample buffer length of 2048
  // default sample rate is 44100, default bit depth is 16
  in = minim.getLineIn(Minim.STEREO, 2048);
  // create an AudioRecorder that will record from in to the filename specified.
  // the file will be located in the sketch's main folder.
  recorder = minim.createRecorder(in, "myrecording.wav");
  // get an output we can playback the recording on
  out = minim.getLineOut( Minim.STEREO );
  textFont(createFont("Arial", 12));

void draw()
  // draw the waveforms
  // the values returned by left.get() and right.get() will be between -1 and 1,
  // so we need to scale them up to see the waveform
  for(int i = 0; i < in.left.size()-1; i++)
    line(i, 50 + in.left.get(i)*50, i+1, 50 + in.left.get(i+1)*50);
    line(i, 150 + in.right.get(i)*50, i+1, 150 + in.right.get(i+1)*50);
  if ( recorder.isRecording() )
    text("Now recording, press the r key to stop recording.", 5, 15);
  else if ( !recorded )
    text("Press the r key to start recording.", 5, 15);
    text("Press the s key to save the recording to disk and play it back in the sketch.", 5, 15);

void keyReleased()
  if ( !recorded && key == 'r' ) 
    // to indicate that you want to start or stop capturing audio data, 
    // you must callstartRecording() and stopRecording() on the AudioRecorder object. 
    // You can start and stop as many times as you like, the audio data will 
    // be appended to the end of to the end of the file. 
    if ( recorder.isRecording() ) 
      recorded = true;
  if ( recorded && key == 's' )
    // we've filled the file out buffer, 
    // now write it to a file of the type we specified in setup
    // in the case of buffered recording, 
    // this will appear to freeze the sketch for sometime, if the buffer is large
    // in the case of streamed recording, 
    // it will not freeze as the data is already in the file and all that is being done
    // is closing the file.
    // save returns the recorded audio in an AudioRecordingStream, 
    // which we can then play with a FilePlayer
    if ( player != null )
        player.unpatch( out );
    player = new FilePlayer( );
    player.patch( out );;


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