Record wav format audio in android

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Environment;

public class WavRecorder {
 private static final int RECORDER_BPP = 16;
 private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";
 private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
 private static final int RECORDER_SAMPLERATE = 44100;
 private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
 private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
 short[] audioData;

 private AudioRecord recorder = null;
 private int bufferSize = 0;
 private Thread recordingThread = null;
 private boolean isRecording = false;
 int[] bufferData;
 int bytesRecorded;

 private String output;

 public WavRecorder(String path) {
  bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
    RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING) * 3;

  audioData = new short[bufferSize]; // short array that pcm data is put
           // into.
  output = path;

 }

 private String getFilename() {
  return (output);
 }

 private String getTempFilename() {
  String filepath = Environment.getExternalStorageDirectory().getPath();
  File file = new File(filepath, AUDIO_RECORDER_FOLDER);

  if (!file.exists()) {
   file.mkdirs();
  }

  File tempFile = new File(filepath, AUDIO_RECORDER_TEMP_FILE);

  if (tempFile.exists())
   tempFile.delete();

  return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);
 }

 public void startRecording() {

  recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
    RECORDER_SAMPLERATE, RECORDER_CHANNELS,
    RECORDER_AUDIO_ENCODING, bufferSize);
  int i = recorder.getState();
  if (i == 1)
   recorder.startRecording();

  isRecording = true;

  recordingThread = new Thread(new Runnable() {
   @Override
   public void run() {
    writeAudioDataToFile();
   }
  }, "AudioRecorder Thread");

  recordingThread.start();
 }

 private void writeAudioDataToFile() {
  byte data[] = new byte[bufferSize];
  String filename = getTempFilename();
  FileOutputStream os = null;

  try {
   os = new FileOutputStream(filename);
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }

  int read = 0;
  if (null != os) {
   while (isRecording) {
    read = recorder.read(data, 0, bufferSize);
    if (read &gt; 0) {
    }

    if (AudioRecord.ERROR_INVALID_OPERATION != read) {
     try {
      os.write(data);
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
   }

   try {
    os.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }

 public void stopRecording() {
  if (null != recorder) {
   isRecording = false;

   int i = recorder.getState();
   if (i == 1)
    recorder.stop();
   recorder.release();

   recorder = null;
   recordingThread = null;
  }

  copyWaveFile(getTempFilename(), getFilename());
  deleteTempFile();
 }

 private void deleteTempFile() {
  File file = new File(getTempFilename());
  file.delete();
 }

 private void copyWaveFile(String inFilename, String outFilename) {
  FileInputStream in = null;
  FileOutputStream out = null;
  long totalAudioLen = 0;
  long totalDataLen = totalAudioLen + 36;
  long longSampleRate = RECORDER_SAMPLERATE;
  int channels = ((RECORDER_CHANNELS == AudioFormat.CHANNEL_IN_MONO) ? 1
    : 2);
  long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8;

  byte[] data = new byte[bufferSize];

  try {
   in = new FileInputStream(inFilename);
   out = new FileOutputStream(outFilename);
   totalAudioLen = in.getChannel().size();
   totalDataLen = totalAudioLen + 36;

   WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
     longSampleRate, channels, byteRate);

   while (in.read(data) != -1) {
    out.write(data);
   }

   in.close();
   out.close();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 private void WriteWaveFileHeader(FileOutputStream out, long totalAudioLen,
   long totalDataLen, long longSampleRate, int channels, long byteRate)
   throws IOException {
  byte[] header = new byte[44];

  header[0] = 'R'; // RIFF/WAVE header
  header[1] = 'I';
  header[2] = 'F';
  header[3] = 'F';
  header[4] = (byte) (totalDataLen &amp; 0xff);
  header[5] = (byte) ((totalDataLen &gt;&gt; 8) &amp; 0xff);
  header[6] = (byte) ((totalDataLen &gt;&gt; 16) &amp; 0xff);
  header[7] = (byte) ((totalDataLen &gt;&gt; 24) &amp; 0xff);
  header[8] = 'W';
  header[9] = 'A';
  header[10] = 'V';
  header[11] = 'E';
  header[12] = 'f'; // 'fmt ' chunk
  header[13] = 'm';
  header[14] = 't';
  header[15] = ' ';
  header[16] = 16; // 4 bytes: size of 'fmt ' chunk
  header[17] = 0;
  header[18] = 0;
  header[19] = 0;
  header[20] = 1; // format = 1
  header[21] = 0;
  header[22] = (byte) channels;
  header[23] = 0;
  header[24] = (byte) (longSampleRate &amp; 0xff);
  header[25] = (byte) ((longSampleRate &gt;&gt; 8) &amp; 0xff);
  header[26] = (byte) ((longSampleRate &gt;&gt; 16) &amp; 0xff);
  header[27] = (byte) ((longSampleRate &gt;&gt; 24) &amp; 0xff);
  header[28] = (byte) (byteRate &amp; 0xff);
  header[29] = (byte) ((byteRate &gt;&gt; 8) &amp; 0xff);
  header[30] = (byte) ((byteRate &gt;&gt; 16) &amp; 0xff);
  header[31] = (byte) ((byteRate &gt;&gt; 24) &amp; 0xff);
  header[32] = (byte) (((RECORDER_CHANNELS == AudioFormat.CHANNEL_IN_MONO) ? 1
    : 2) * 16 / 8); // block align
  header[33] = 0;
  header[34] = RECORDER_BPP; // bits per sample
  header[35] = 0;
  header[36] = 'd';
  header[37] = 'a';
  header[38] = 't';
  header[39] = 'a';
  header[40] = (byte) (totalAudioLen &amp; 0xff);
  header[41] = (byte) ((totalAudioLen &gt;&gt; 8) &amp; 0xff);
  header[42] = (byte) ((totalAudioLen &gt;&gt; 16) &amp; 0xff);
  header[43] = (byte) ((totalAudioLen &gt;&gt; 24) &amp; 0xff);

  out.write(header, 0, 44);
 }
}</code> //Call Above class like

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import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import android.media.AudioFormat;

import android.media.AudioRecord;

import android.media.MediaRecorder;

import android.os.Environment;

public class WavRecorder {

private static final int RECORDER_BPP = 16;

private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";

private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";

private static final int RECORDER_SAMPLERATE = 44100;

private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;

private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

short[] audioData;

private AudioRecord recorder = null;

private int bufferSize = 0;

private Thread recordingThread = null;

private boolean isRecording = false;

int[] bufferData;

int bytesRecorded;

private String output;

public WavRecorder(String path) {

bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,

RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING) * 3;

audioData = new short[bufferSize]; // short array that pcm data is put

// into.

output = path;

}

private String getFilename() {

return (output);

}

private String getTempFilename() {

String filepath = Environment.getExternalStorageDirectory().getPath();

File file = new File(filepath, AUDIO_RECORDER_FOLDER);

if (!file.exists()) {

file.mkdirs();

}

File tempFile = new File(filepath, AUDIO_RECORDER_TEMP_FILE);

if (tempFile.exists())

tempFile.delete();

return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);

}

public void startRecording() {

recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,

RECORDER_SAMPLERATE, RECORDER_CHANNELS,

RECORDER_AUDIO_ENCODING, bufferSize);

int i = recorder.getState();

if (i == 1)

recorder.startRecording();

isRecording = true;

recordingThread = new Thread(new Runnable() {

@Override

public void run() {

writeAudioDataToFile();

}

}, "AudioRecorder Thread");

recordingThread.start();

}

private void writeAudioDataToFile() {

byte data[] = new byte[bufferSize];

String filename = getTempFilename();

FileOutputStream os = null;

try {

os = new FileOutputStream(filename);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

int read = 0;

if (null != os) {

while (isRecording) {

read = recorder.read(data, 0, bufferSize);

if (read > 0) {

}

if (AudioRecord.ERROR_INVALID_OPERATION != read) {

try {

os.write(data);

} catch (IOException e) {

e.printStackTrace();

}

try {

os.close();

} catch (IOException e) {

e.printStackTrace();

}

public void stopRecording() {

if (null != recorder) {

isRecording = false;

int i = recorder.getState();

if (i == 1)

recorder.stop();

recorder.release();

recorder = null;

recordingThread = null;

}

copyWaveFile(getTempFilename(), getFilename());

deleteTempFile();

}

private void deleteTempFile() {

File file = new File(getTempFilename());

file.delete();

}

private void copyWaveFile(String inFilename, String outFilename) {

FileInputStream in = null;

FileOutputStream out = null;

long totalAudioLen = 0;

long totalDataLen = totalAudioLen + 36;

long longSampleRate = RECORDER_SAMPLERATE;

int channels = ((RECORDER_CHANNELS == AudioFormat.CHANNEL_IN_MONO) ? 1

: 2);

long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8;

byte[] data = new byte[bufferSize];

try {

in = new FileInputStream(inFilename);

out = new FileOutputStream(outFilename);

totalAudioLen = in.getChannel().size();

totalDataLen = totalAudioLen + 36;

WriteWaveFileHeader(out, totalAudioLen, totalDataLen,

longSampleRate, channels, byteRate);

while (in.read(data) != -1) {

out.write(data);

}

in.close();

out.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

private void WriteWaveFileHeader(FileOutputStream out, long totalAudioLen,

long totalDataLen, long longSampleRate, int channels, long byteRate)

throws IOException {

byte[] header = new byte[44];

header[0] = 'R'; // RIFF/WAVE header

header[1] = 'I';

header[2] = 'F';

header[3] = 'F';

header[4] = (byte) (totalDataLen & 0xff);

header[5] = (byte) ((totalDataLen >> 8) & 0xff);

header[6] = (byte) ((totalDataLen >> 16) & 0xff);

header[7] = (byte) ((totalDataLen >> 24) & 0xff);

header[8] = 'W';

header[9] = 'A';

header[10] = 'V';

header[11] = 'E';

header[12] = 'f'; // 'fmt ' chunk

header[13] = 'm';

header[14] = 't';

header[15] = ' ';

header[16] = 16; // 4 bytes: size of 'fmt ' chunk

header[17] = 0;

header[18] = 0;

header[19] = 0;

header[20] = 1; // format = 1

header[21] = 0;

header[22] = (byte) channels;

header[23] = 0;

header[24] = (byte) (longSampleRate & 0xff);

header[25] = (byte) ((longSampleRate >> 8) & 0xff);

header[26] = (byte) ((longSampleRate >> 16) & 0xff);

header[27] = (byte) ((longSampleRate >> 24) & 0xff);

header[28] = (byte) (byteRate & 0xff);

header[29] = (byte) ((byteRate >> 8) & 0xff);

header[30] = (byte) ((byteRate >> 16) & 0xff);

header[31] = (byte) ((byteRate >> 24) & 0xff);

header[32] = (byte) (((RECORDER_CHANNELS == AudioFormat.CHANNEL_IN_MONO) ? 1

: 2) * 16 / 8); // block align

header[33] = 0;

header[34] = RECORDER_BPP; // bits per sample

header[35] = 0;

header[36] = 'd';

header[37] = 'a';

header[38] = 't';

header[39] = 'a';

header[40] = (byte) (totalAudioLen & 0xff);

header[41] = (byte) ((totalAudioLen >> 8) & 0xff);

header[42] = (byte) ((totalAudioLen >> 16) & 0xff);

header[43] = (byte) ((totalAudioLen >> 24) & 0xff);

out.write(header, 0, 44);

}

}</code> //Call Above class like

WavRecorder wavRecorder = new WavRecorder("path_to_file.wav");
wavRecorder.startRecording();
//do something else...
wavRecorder.stopRecording();

WavRecorder wavRecorder = new WavRecorder("path_to_file.wav");

wavRecorder.startRecording();

//do something else...

wavRecorder.stopRecording();

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