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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Play sampled audio

This is a tutorial that shows how to play sampled audio in a Java Desktop applications. You can use this if you want to embed a simple media player in your application.

In order to play sampled audio one should follow these steps:

  • Obtain an audio input stream from the provided file calling AudioSystem.getAudioInputStream(new File("sampled_file.wav")).
  • Then, obtain the audio format of the sound data in this audio input stream calling getFormat().
  • Create a new AudioFormat.
  • Construct a data line’s info object from the specified information with SourceDataLine.Info lineInfo = new DataLine.Info().
  •  Allow the line to engage in data I/O using dataLine.start().

Let’s see the code:

package com.javacodegeeks.snippets.desktop;

import java.io.File;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.SourceDataLine;

public class PlaySampledAudio {

	public static void main(String[] args) throws Exception {

		// obtain an audio input stream from the provided file
		AudioInputStream stream = AudioSystem.getAudioInputStream(new File("sampled_file.wav"));

		// obtain the audio format of the sound data in this audio input stream
		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

  );

  stream = AudioSystem.getAudioInputStream(format, stream);
	    }

		// construct a data line's info object from the specified information,
		// which includes a single audio format and a desired buffer size
		SourceDataLine.Info lineInfo = new DataLine.Info(
					SourceDataLine.class,
					stream.getFormat(),
					((int)stream.getFrameLength()*format.getFrameSize())
		);

		// obtain a line that matches the description in the specified Line.Info
	    SourceDataLine dataLine = (SourceDataLine) AudioSystem.getLine(lineInfo);

	    // open the line with the specified format, causing the line to acquire any 
	    // required system resources and become operational  
	    dataLine.open(stream.getFormat());

	    // allow the line to engage in data I/O.
	    dataLine.start();

	    int bytesRead = 0;
	    byte[] buffer = new byte[dataLine.getBufferSize()];

	    // read from the input file and play
	    while ((bytesRead = stream.read(buffer, 0, buffer.length)) >= 0) {

  int offset = 0;

  while (offset < bytesRead) {

offset += dataLine.write(buffer, offset, bytesRead-offset);

  }
	    }

	    // drain queued data from the line by continuing data I/O until the
	    // data line's internal buffer has been emptied
	    dataLine.drain();

	    // stop the line, a stopped line should cease I/O activity
	    dataLine.stop();

	    // closes the line, indicating that any system resources
	    // in use by the line can be released.
	    dataLine.close();

	}

}

This was an example on how to play sampled audio in Java.

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