Open a file audio in R.Raw

I have to open a file that in the /res/raw/ folder, but it seems tha android, doesn't reccognize the path. Here is my code:

public static void openRec()
{
    //this is the wav file that I have to analyze
    File file = new File("/res/raw/chirp.wav");

    try {
       FileInputStream in = new FileInputStream(file);
       chirp = new byte[(int) file.length()];
       in.read(chirp);


        Log.d("xxx", "" + chirp.length);
        in.close();


    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}