Recording .Wav with Android AudioRecorder

Question

I have read a lot of pages about Android\'s AudioRecorder. You can see a list of them below the question.

I\'m trying to record audio with AudioRecorder, but it\'s n

Answer 1

First you need know that wav file has its format -- header. so you can't just write the pure data to the .wav file.

Second the wav file header include the length of file . so you need write the header after recording.

My solution is , user AudioRecorder record the pcm file .

    byte[] audiodata = new byte[bufferSizeInBytes];

    FileOutputStream fos = null;
    int readsize = 0;
    try {
        fos = new FileOutputStream(pcmFileName, true);
    } catch (FileNotFoundException e) {
        Log.e("AudioRecorder", e.getMessage());
    }

    status = Status.STATUS_START;
    while (status == Status.STATUS_START && audioRecord != null) {
        readsize = audioRecord.read(audiodata, 0, bufferSizeInBytes);
        if (AudioRecord.ERROR_INVALID_OPERATION != readsize && fos != null) {

            if (readsize > 0 && readsize <= audiodata.length)
                    fos.write(audiodata, 0, readsize);
            } catch (IOException e) {
                Log.e("AudioRecorder", e.getMessage());
            }
        }
    }
    try {
        if (fos != null) {
            fos.close();
        }
    } catch (IOException e) {
        Log.e("AudioRecorder", e.getMessage());
    }

then convert it to wav file.

    byte buffer[] = null;
    int TOTAL_SIZE = 0;
    File file = new File(pcmPath);
    if (!file.exists()) {
        return false;
    }
    TOTAL_SIZE = (int) file.length();

    WaveHeader header = new WaveHeader();

    header.fileLength = TOTAL_SIZE + (44 - 8);
    header.FmtHdrLeth = 16;
    header.BitsPerSample = 16;
    header.Channels = 1;
    header.FormatTag = 0x0001;
    header.SamplesPerSec = 8000;
    header.BlockAlign = (short) (header.Channels * header.BitsPerSample / 8);
    header.AvgBytesPerSec = header.BlockAlign * header.SamplesPerSec;
    header.DataHdrLeth = TOTAL_SIZE;

    byte[] h = null;
    try {
        h = header.getHeader();
    } catch (IOException e1) {
        Log.e("PcmToWav", e1.getMessage());
        return false;
    }

    if (h.length != 44) 
        return false;


    File destfile = new File(destinationPath);
    if (destfile.exists())
        destfile.delete();


    try {
        buffer = new byte[1024 * 4]; // Length of All Files, Total Size
        InputStream inStream = null;
        OutputStream ouStream = null;

        ouStream = new BufferedOutputStream(new FileOutputStream(
                destinationPath));
        ouStream.write(h, 0, h.length);
        inStream = new BufferedInputStream(new FileInputStream(file));
        int size = inStream.read(buffer);
        while (size != -1) {
            ouStream.write(buffer);
            size = inStream.read(buffer);
        }
        inStream.close();
        ouStream.close();
    } catch (FileNotFoundException e) {
        Log.e("PcmToWav", e.getMessage());
        return false;
    } catch (IOException ioe) {
        Log.e("PcmToWav", ioe.getMessage());
        return false;
    }
    if (deletePcmFile) {
        file.delete();
    }
    Log.i("PcmToWav", "makePCMFileToWAVFile  success!" + new SimpleDateFormat("yyyy-MM-dd hh:mm").format(new Date()));
    return true;