To convert byte array to mp3 file

Question

I have written an application in android to record voice from mic and store it in byte array using

audioRecord.read(bigBuff, currSize, minBuffSize);

bigBuff is an byte array now i want to convert this byte array into .mp3 file or .wav file I am doing this as

File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/aaa.wav");

f.createNewFile();
FileOutputStream fos = new FileOutputStream(f);
fos.write(bigBuff);
fos.flush();
fos.close();

aaa.wav file is getting created successfully but when I am trying to play it from outside the app like any other .wav or .mp3 file its showing error "sorry Player does not support this type of audio file"

please help.

audioRecord is an object of AudioRecord class and read is its method. — DCoder

Amadas Amadas · Accepted Answer · 2014-03-11T08:02:32

I think you don't input data header.
add this mothod and after copy data.

        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);
    }

To convert byte array to mp3 file

2 Answers