MinimalEchoExample.java

package net.labymod.opus;

import javax.sound.sampled.*;
import java.io.IOException;

public class MinimalEchoExample {
    private static AudioFormat format =
            new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 48000, 16, 1, 2, 48000, false);

    public static void main(String[] args) throws LineUnavailableException, IOException {
        OpusCodec.setupWithTemporaryFolder();

        OpusCodec codec = OpusCodec.createDefault();
/*
    Could also use the builder to customize the codec.
    OpusCodec.newBuilder()
            .withSampleRate(24000)
            ...
            .build();
*/


//        get default microphone and open it at the selected format
        TargetDataLine microphone = AudioSystem.getTargetDataLine(format);
        microphone.open(microphone.getFormat());
        microphone.start();

//        get default speaker and open it at the selected format
        SourceDataLine speaker = AudioSystem.getSourceDataLine(format);
        speaker.open(microphone.getFormat());
        speaker.start();


        while (true) {
            //Reading microphone data
            byte[] data = new byte[codec.getChannels() * codec.getFrameSize() * 2];
            microphone.read(data, 0, data.length);

            //Encoding PCM data chunk
            byte[] encode = codec.encodeFrame(data);

            //Decoding PCM data chunk
            byte[] decoded = codec.decodeFrame(encode);
            speaker.write(decoded, 0, decoded.length);
        }
    }

}