base64 encode audio file and send as a String then decode the String

Question

I have been stuck on this issue for a few hours now trying to get it working. Basically what I am trying to do is the following. Base64 encode an audio file picked up from a

Answer 1

Decoding base64 string file to .m4a file format

try
{
    String audioDataString = "";
    BufferedReader jsonReader = new BufferedReader(new InputStreamReader(this.getResources().openRawResource(R.raw.audioBase64File)));
    StringBuilder jsonBuilder = new StringBuilder();
    for (String line = null; (line = jsonReader.readLine()) != null; ) {
        jsonBuilder.append(line).append("");
    }
    audioDataString = jsonBuilder.toString();
    byte[] decoded = Base64.decode(audioDataString, Base64.DEFAULT);
    try {
        File file2 = new File(Environment.getExternalStorageDirectory() + "/faakhir_testAudio.m4a");
        FileOutputStream os = new FileOutputStream(file2, true);
        os.write(decoded);
        os.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
} catch(Exception e){
    e.printStackTrace();
}

Answer 2

You're heavily mixing Strings and byte[]s. Don't do that. If you want to encode a byte[] to a String, use Base64.encodeToString(), instead of encoding to bytes and then creating a string.

If I try to save decodedBytes using os.write(decodedBytes) it works but not when converted to a String and getBytes() is used.

Calling new String(byte[]) does not do what you think it does.

Likewise use Base64.decode(String, int) to decode the string.

Something like this (not tested):

File file = new File(Environment.getExternalStorageDirectory() + "/hello-4.wav");
byte[] bytes = FileUtils.readFileToByteArray(file);

String encoded = Base64.encodeToString(bytes, 0);                                       
Utilities.log("~~~~~~~~ Encoded: ", encoded);

byte[] decoded = Base64.decode(encoded, 0);
Utilities.log("~~~~~~~~ Decoded: ", Arrays.toString(decoded));

try
{
    File file2 = new File(Environment.getExternalStorageDirectory() + "/hello-5.wav");
    FileOutputStream os = new FileOutputStream(file2, true);
    os.write(decoded);
    os.close();
}
catch (Exception e)
{
    e.printStackTrace();
}

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But why are you base64 encoding an audio file in the first place?