Android .wav audio recording

Question

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.Bundle; import android.os.Environment; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity { private static final int RECORDER_BPP = 16; private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav"; 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_STEREO; 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; Complex[] fftTempArray; Complex[] fftArray; int[] bufferData; int bytesRecorded; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setButtonHandlers(); enableButtons(false); bufferSize = AudioRecord.getMinBufferSize (RECORDER_SAMPLERATE,RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING)*3; audioData = new short [bufferSize]; //short array that pcm data is put into. } private void setButtonHandlers() { ((Button)findViewById(R.id.btnStart)).setOnClickListener(btnClick); ((Button)findViewById(R.id.btnStop)).setOnClickListener(btnClick); } private void enableButton(int id,boolean isEnable){ ((Button)findViewById(id)).setEnabled(isEnable); } private void enableButtons(boolean isRecording) { enableButton(R.id.btnStart,!isRecording); enableButton(R.id.btnStop,isRecording); } private String getFilename(){ String filepath = Environment.getExternalStorageDirectory().getPath(); File file = new File(filepath,AUDIO_RECORDER_FOLDER); if (!file.exists()) { file.mkdirs(); } return (file.getAbsolutePath() + "/" + System.currentTimeMillis() + AUDIO_RECORDER_FILE_EXT_WAV); } 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); } private 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) { // TODO Auto-generated catch block 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(); } } } private 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 = 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; AppLog.logString("File size: " + totalDataLen); 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) (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); } private View.OnClickListener btnClick = new View.OnClickListener() { @Override public void onClick(View v) { switch(v.getId()){ case R.id.btnStart:{ AppLog.logString("Start Recording"); enableButtons(true); startRecording(); break; } case R.id.btnStop:{ AppLog.logString("Start Recording"); enableButtons(false); stopRecording(); break; } } } }; } 

I am new to android.I used this code to save the recorded sound in .wav format, but the AudioRecorder folder specified in this code is not created. I want to save this .wav audio file in internal storage.

Answer 1

If you are running Android 6.0 or later, you need to set your rights manually in the settings of your phone. Or ask for both RECORD_AUDIO and WRITE_EXTERNAL_STORAGE at run time.