Plays a tone having the given frequency, amplitude, and duration. - Java javax.sound.sampled

Java examples for javax.sound.sampled:Audio

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Description

Plays a tone having the given frequency, amplitude, and duration.

Demo Code


import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;
import org.apache.log4j.Logger;

public class Main{
    public static void main(String[] argv) throws Exception{
        int frequency = 2;
        int amplitude = 2;
        int duration = 2;
        playTone(frequency,amplitude,duration);
    }//from   w ww. ja  va 2 s .  c o  m
    private static final Logger LOG = Logger.getLogger(AudioHelper.class);
    private static final int BYTES_PER_SAMPLE = 2;
    private static final int SAMPLE_BUFFER_LENGTH = 4096;
    private static final int SAMPLE_RATE = 44100;
    private static final int MONO = 1;
    public static final int MAX_AMPLITUDE = 10;
    /** Plays a tone having the given <code>frequency</code>, <code>amplitude</code>, and <code>duration</code>. */
    public static void playTone(final int frequency, final int amplitude,
            final int duration) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("AudioHelper.playTone(" + frequency + "," + amplitude
                    + "," + duration + ")");
        }

        final AudioFormat af = new AudioFormat((float) SAMPLE_RATE,
                8 * BYTES_PER_SAMPLE, MONO, true, false);
        final SourceDataLine sdl;

        try {
            sdl = (SourceDataLine) AudioSystem.getLine(new DataLine.Info(
                    SourceDataLine.class, af));
            sdl.open(af, SAMPLE_BUFFER_LENGTH * BYTES_PER_SAMPLE);
            sdl.start();
        } catch (LineUnavailableException e) {
            LOG.debug("Could not open audio device.", e);
            return;
        }

        final int length = (int) (SAMPLE_RATE * ((double) duration / 1000.0));

        int bp = 0;
        final byte[] buffer = new byte[SAMPLE_BUFFER_LENGTH
                * BYTES_PER_SAMPLE];
        for (int i = 0; i < length; i++) {
            int cappedAmplitude = amplitude;
            if (cappedAmplitude > MAX_AMPLITUDE) {
                cappedAmplitude = MAX_AMPLITUDE;
            }
            final short multiplier = (short) (cappedAmplitude
                    * Short.MAX_VALUE / MAX_AMPLITUDE);
            final double wave = Math.cos(2 * Math.PI * i * frequency
                    / SAMPLE_RATE);
            final short sample = (short) (multiplier * wave);
            buffer[bp++] = (byte) sample;
            buffer[bp++] = (byte) (sample >> 8);

            if (bp >= buffer.length) {
                sdl.write(buffer, 0, buffer.length);
                bp = 0;
            }
        }
        sdl.drain();
        sdl.close();
    }
}

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