I want to convert the audio file to a text file in java i.e first the audio file will be played and after it is played it will copy the lyrics into a text file, and vice versa, in java. But, I don't know from where I will start it, so, can anyone tell me how to do that?
Have you tried following?
http://cmusphinx.sourceforge.net/wiki/download/
In a unix shell (or Google) $ man uuencode
This POSIX UNIX utility converts binary to text file and vice versa.
The following is the man page from Ubuntu 10.04 LTS: (see attachment)
Therefore, any Java solution would be reinventing the wheel not to supports the same base64 encoding and command line interface.
From http://java-espresso.blogspot.ca/2011/10/base64-encoding-and-decoding-in-java.html
Once you have your Base64 encoded string audio file, you can decode it to a byte array using Base64 Java class as follows:
String content = new String(Files.readAllBytes(Paths.get("path_to_your_base64_encoded_audio")));
byte[] decoded = Base64.decode(content);
From now on your byte array stores all the required info to be played if you want so.