generate Tone via AudioTrack - Android android.media

Android examples for android.media:Audio

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Description

generate Tone via AudioTrack

Demo Code

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;

public class Main {

  public static AudioTrack generateTone(double freqHz, int durationMs) {
    int count = (int) (44100.0 * 2.0 * (durationMs / 1000.0)) & ~1;
    short[] samples = new short[count];
    for (int i = 0; i < count; i += 2) {
      short sample = (short) (Math.sin(2 * Math.PI * i / (44100.0 / freqHz)) * 0x7FFF);
      samples[i + 0] = sample;//from  ww w  .j  a v a  2s .  com
      samples[i + 1] = sample;
    }
    AudioTrack track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_STEREO,
        AudioFormat.ENCODING_PCM_16BIT, count * (Short.SIZE / 8), AudioTrack.MODE_STATIC);
    track.write(samples, 0, count);
    return track;
  }

}

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