Android Open Source - Torch Listen

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Back to project page Torch.

License

The source code is released under:

GNU General Public License

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Java Source Code

package com.aktarer.torch.features;
/*from  w  ww.  jav  a 2 s  . co m*/
import java.nio.ByteBuffer;

import android.content.Context;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.util.Log;

import com.aktarer.torch.ServerThread;

public class Listen extends Base {
  public static final int SAMPLE_RATE = 16000;
  private AudioRecord mRecorder;
  private short[] mBuffer;

  public Listen(Context c, ServerThread t) {
    super(c, t);

    run();
  }

  protected void sendWaveHeaders() throws Exception {
    // WAVE header
    // see http://ccrma.stanford.edu/courses/422/projects/WaveFormat/
    writeString("RIFF"); // chunk id
    writeInt(36); // chunk size, write 36 for streaming
    writeString("WAVE"); // format
    writeString("fmt "); // subchunk 1 id
    writeInt(16); // subchunk 1 size
    writeShort((short) 1); // audio format (1 = PCM)
    writeShort((short) 1); // number of channels
    writeInt(SAMPLE_RATE); // sample rate
    writeInt(SAMPLE_RATE * 2); // byte rate
    writeShort((short) 2); // block align
    writeShort((short) 16); // bits per sample
    writeString("data"); // subchunk 2 id
    writeInt(0); // subchunk 2 size, write 0 for streaming
  }

  @Override
  public void run() {
    thread.setAudioOutput();

    int bufferSize = AudioRecord.getMinBufferSize(SAMPLE_RATE,
        AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
    mBuffer = new short[bufferSize];
    mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE,
        AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT,
        bufferSize);

    mRecorder.startRecording();

    try {
      sendWaveHeaders();

      while (true) {
        int readSize = mRecorder.read(mBuffer, 0, mBuffer.length);
        
        ByteBuffer rawBytes = ByteBuffer.allocate(mBuffer.length);
        
        for (int i = 0; i < mBuffer.length / 2; i++) {
          short s = mBuffer[i];
          rawBytes.put((byte) (s & 0xff));
          rawBytes.put((byte) ((s >> 8) & 0xff));
        }

        thread.send(rawBytes.array(), true);
      }
    } catch (Exception e) {
    }
  }

  private void writeInt(final int value) throws Exception {
    write(value >> 0);
    write(value >> 8);
    write(value >> 16);
    write(value >> 24);
  }

  private void writeShort(final short value) throws Exception {
    write(value >> 0);
    write(value >> 8);
  }

  private void writeString(final String value) throws Exception {
    for (int i = 0; i < value.length(); i++) {
      write(value.charAt(i));
    }
  }

  protected void write(int value) throws Exception {
    thread.send(value, true);
  }

}

Java Source Code List