Android - How to convert raw audio data to wav?

Question

I applied the sound recording function in an Android application. My application works fine on Linux. but when I run the same application on mac osx and record audio, it resets my application.

private AudioRecordingThread recordingThread; recordingThread = new AudioRecordingThread(fileName, new AudioRecordingHandler() { @Override public void onFftDataCapture(final byte[] bytes) { runOnUiThread(new Runnable() { public void run() { if (visualizerView != null) { visualizerView.updateVisualizerFFT(bytes); } } }); } @Override public void onRecordSuccess() { } @Override public void onRecordingError() { runOnUiThread(new Runnable() { public void run() { recordStop(); NotificationUtils.showInfoDialog( ActivityCropImage.this, "Error in saving"); } }); } @Override public void onRecordSaveError() { runOnUiThread(new Runnable() { public void run() { recordStop(); NotificationUtils.showInfoDialog( ActivityCropImage.this, "Error in recording"); } }); } }); PcmAudioHelper.convertRawToWav(WavAudioFormat.mono16Bit(SAMPLING_RATE), file_raw, file_wav); 

This is the line of code where my application crashed. I used https://github.com/steelkiwi/AndroidRecording in my project.

Answer 1

 package com.record.util; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.os.Environment; import android.text.format.Time; import android.util.Log; 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 java.nio.ByteBuffer; import java.nio.ByteOrder; public class RecordWavMaster { private static final int samplingRates[] = {16000, 11025, 11000, 8000, 6000}; public static int SAMPLE_RATE = 16000; private AudioRecord mRecorder; private File mRecording; private short[] mBuffer; private String audioFilePath; private boolean mIsRecording = false; private String RECORD_WAV_PATH = Environment.getExternalStorageDirectory() + File.separator + "AudioRecord"; /* Initializing AudioRecording MIC */ public RecordWavMaster() { initRecorder(); } /* Get Supported Sample Rate */ public static int getValidSampleRates() { for (int rate : samplingRates) { int bufferSize = AudioRecord.getMinBufferSize(rate, AudioFormat.CHANNEL_CONFIGURATION_DEFAULT, AudioFormat.ENCODING_PCM_16BIT); if (bufferSize > 0) { return rate; } } return SAMPLE_RATE; } /* Start AudioRecording */ public void recordWavStart() { mIsRecording = true; mRecorder.startRecording(); mRecording = getFile("raw"); startBufferedWrite(mRecording); } /* Stop AudioRecording */ public String recordWavStop() { try { mIsRecording = false; mRecorder.stop(); File waveFile = getFile("wav"); rawToWave(mRecording, waveFile); Log.e("path_audioFilePath",audioFilePath); return audioFilePath; } catch (Exception e) { Log.e("Error saving file : ", e.getMessage()); } return null; } /* Release device MIC */ public void releaseRecord() { mRecorder.release(); } /* Initializing AudioRecording MIC */ private void initRecorder() { SAMPLE_RATE = getValidSampleRates(); 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); new File(RECORD_WAV_PATH).mkdir(); } /* Writing RAW file */ private void startBufferedWrite(final File file) { new Thread(new Runnable() { @Override public void run() { DataOutputStream output = null; try { output = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file))); while (mIsRecording) { double sum = 0; int readSize = mRecorder.read(mBuffer, 0, mBuffer.length); for (int i = 0; i < readSize; i++) { output.writeShort(mBuffer[i]); sum += mBuffer[i] * mBuffer[i]; } if (readSize > 0) { final double amplitude = sum / readSize; } } } catch (IOException e) { Log.e("Error writing file : ", e.getMessage()); } finally { if (output != null) { try { output.flush(); } catch (IOException e) { Log.e("Error writing file : ", e.getMessage()); } finally { try { output.close(); } catch (IOException e) { Log.e("Error writing file : ", e.getMessage()); } } } } } }).start(); } /* Converting RAW format To WAV Format*/ private void rawToWave(final File rawFile, final File waveFile) throws IOException { byte[] rawData = new byte[(int) rawFile.length()]; DataInputStream input = null; try { input = new DataInputStream(new FileInputStream(rawFile)); input.read(rawData); } finally { if (input != null) { input.close(); } } DataOutputStream output = null; try { output = new DataOutputStream(new FileOutputStream(waveFile)); // WAVE header writeString(output, "RIFF"); // chunk id writeInt(output, 36 + rawData.length); // chunk size writeString(output, "WAVE"); // format writeString(output, "fmt "); // subchunk 1 id writeInt(output, 16); // subchunk 1 size writeShort(output, (short) 1); // audio format (1 = PCM) writeShort(output, (short) 1); // number of channels writeInt(output, SAMPLE_RATE); // sample rate writeInt(output, SAMPLE_RATE * 2); // byte rate writeShort(output, (short) 2); // block align writeShort(output, (short) 16); // bits per sample writeString(output, "data"); // subchunk 2 id writeInt(output, rawData.length); // subchunk 2 size // Audio data (conversion big endian -> little endian) short[] shorts = new short[rawData.length / 2]; ByteBuffer.wrap(rawData).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shorts); ByteBuffer bytes = ByteBuffer.allocate(shorts.length * 2); for (short s : shorts) { bytes.putShort(s); } output.write(bytes.array()); } finally { if (output != null) { output.close(); rawFile.delete(); } } } /* Get file name */ private File getFile(final String suffix) { Time time = new Time(); time.setToNow(); audioFilePath = time.format("%Y%m%d%H%M%S"); return new File(RECORD_WAV_PATH, time.format("%Y%m%d%H%M%S") + "." + suffix); } private void writeInt(final DataOutputStream output, final int value) throws IOException { output.write(value >> 0); output.write(value >> 8); output.write(value >> 16); output.write(value >> 24); } private void writeShort(final DataOutputStream output, final short value) throws IOException { output.write(value >> 0); output.write(value >> 8); } private void writeString(final DataOutputStream output, final String value) throws IOException { for (int i = 0; i < value.length(); i++) { output.write(value.charAt(i)); } } public String getFileName (final String time_suffix) { return (RECORD_WAV_PATH+time_suffix+ "." + "wav"); } public Boolean getRecordingState () { if( mRecorder.getRecordingState() == AudioRecord.RECORDSTATE_STOPPED) { return false; } return true; } } 

Use the following permissions in the manifest

  <!--Permission record--> <uses-permission android:name="android.permission.RECORD_AUDIO" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />