Using AudioRecord : AudioRecord « Media « Android

1. Android
2. Media
3. AudioRecord

Using AudioRecord

  
package app.test;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class Test extends Activity implements OnClickListener {
  RecordAudio recordTask;
  PlayAudio playTask;
  Button startRecordingButton, stopRecordingButton, startPlaybackButton,
      stopPlaybackButton;
  TextView statusText;
  File recordingFile;

  boolean isRecording = false,isPlaying = false;

  int frequency = 11025,channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;
  int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    statusText = (TextView) this.findViewById(R.id.StatusTextView);

    startRecordingButton = (Button) this
        .findViewById(R.id.StartRecordingButton);
    stopRecordingButton = (Button) this
        .findViewById(R.id.StopRecordingButton);
    startPlaybackButton = (Button) this
        .findViewById(R.id.StartPlaybackButton);
    stopPlaybackButton = (Button) this
        .findViewById(R.id.StopPlaybackButton);

    startRecordingButton.setOnClickListener(this);
    stopRecordingButton.setOnClickListener(this);
    startPlaybackButton.setOnClickListener(this);
    stopPlaybackButton.setOnClickListener(this);

    stopRecordingButton.setEnabled(false);
    startPlaybackButton.setEnabled(false);
    stopPlaybackButton.setEnabled(false);

    File path = new File(
        Environment.getExternalStorageDirectory().getAbsolutePath()
            + "/Android/data/com.apress.proandroidmedia.ch07.altaudiorecorder/files/");
    path.mkdirs();
    try {
      recordingFile = File.createTempFile("recording", ".pcm", path);
    } catch (IOException e) {
      throw new RuntimeException("Couldn't create file on SD card", e);
    }
  }

  public void onClick(View v) {
    if (v == startRecordingButton) {
      record();
    } else if (v == stopRecordingButton) {
      stopRecording();
    } else if (v == startPlaybackButton) {
      play();
    } else if (v == stopPlaybackButton) {
      stopPlaying();
    }
  }

  public void play() {
    startPlaybackButton.setEnabled(true);

    playTask = new PlayAudio();
    playTask.execute();

    stopPlaybackButton.setEnabled(true);
  }

  public void stopPlaying() {
    isPlaying = false;
    stopPlaybackButton.setEnabled(false);
    startPlaybackButton.setEnabled(true);
  }

  public void record() {
    startRecordingButton.setEnabled(false);
    stopRecordingButton.setEnabled(true);
    startPlaybackButton.setEnabled(true);
    recordTask = new RecordAudio();
    recordTask.execute();
  }
  public void stopRecording() {
    isRecording = false;
  }

  private class PlayAudio extends AsyncTask<Void, Integer, Void> {
    @Override
    protected Void doInBackground(Void... params) {
      isPlaying = true;

      int bufferSize = AudioTrack.getMinBufferSize(frequency,channelConfiguration, audioEncoding);
      short[] audiodata = new short[bufferSize / 4];

      try {
        DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(recordingFile)));
        AudioTrack audioTrack = new AudioTrack(
            AudioManager.STREAM_MUSIC, frequency,
            channelConfiguration, audioEncoding, bufferSize,
            AudioTrack.MODE_STREAM);

        audioTrack.play();
        while (isPlaying && dis.available() > 0) {
          int i = 0;
          while (dis.available() > 0 && i < audiodata.length) {
            audiodata[i] = dis.readShort();
            i++;
          }
          audioTrack.write(audiodata, 0, audiodata.length);
        }
        dis.close();
        startPlaybackButton.setEnabled(false);
        stopPlaybackButton.setEnabled(true);
      } catch (Throwable t) {
        Log.e("AudioTrack", "Playback Failed");
      }
      return null;
    }
  }
  private class RecordAudio extends AsyncTask<Void, Integer, Void> {
    @Override
    protected Void doInBackground(Void... params) {
      isRecording = true;
      try {
        DataOutputStream dos = new DataOutputStream(
            new BufferedOutputStream(new FileOutputStream(
                recordingFile)));
        int bufferSize = AudioRecord.getMinBufferSize(frequency,
            channelConfiguration, audioEncoding);
        AudioRecord audioRecord = new AudioRecord(
            MediaRecorder.AudioSource.MIC, frequency,
            channelConfiguration, audioEncoding, bufferSize);

        short[] buffer = new short[bufferSize];
        audioRecord.startRecording();
        int r = 0;
        while (isRecording) {
          int bufferReadResult = audioRecord.read(buffer, 0,
              bufferSize);
          for (int i = 0; i < bufferReadResult; i++) {
            dos.writeShort(buffer[i]);
          }
          publishProgress(new Integer(r));
          r++;
        }
        audioRecord.stop();
        dos.close();
      } catch (Throwable t) {
        Log.e("AudioRecord", "Recording Failed");
      }
      return null;
    }
    protected void onProgressUpdate(Integer... progress) {
      statusText.setText(progress[0].toString());
    }
    protected void onPostExecute(Void result) {
      startRecordingButton.setEnabled(true);
      stopRecordingButton.setEnabled(false);
      startPlaybackButton.setEnabled(true);
    }
  }
}

//main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
  <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Status" android:id="@+id/StatusTextView"/>

  <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Start Recording" android:id="@+id/StartRecordingButton"></Button>
  <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Stop Recording" android:id="@+id/StopRecordingButton"></Button>
  <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Start Playback" android:id="@+id/StartPlaybackButton"></Button>
  <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Stop Playback" android:id="@+id/StopPlaybackButton"></Button>
</LinearLayout>

   
    
  

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