Problems with java and reading data from a CD drive in linux

Question

I have been trying to write a simple audio ripper that i can use to learn how diffrent CODEC's work but i have got stuck on the first step, i cant get my program to read from the CD, the folowing code is what i have been trying to use

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Scanner;


public class learning 
{
    public static void main(String[] args) throws IOException 
    {   
        File cd = new File( "/dev/sr0" );
        RandomAccessFile rawAccess = new RandomAccessFile( cd, "r" );
        byte[] content = new byte[20];
        rawAccess.seek(19613);
        rawAccess.readFully(content);

        System.out.println(content);
    }

}

but it gives me the folowing error

Exception in thread "main" java.io.IOException: Input/output error
    at java.io.RandomAccessFile.readBytes(Native Method)
    at java.io.RandomAccessFile.read(RandomAccessFile.java:355)
    at java.io.RandomAccessFile.readFully(RandomAccessFile.java:414)
    at java.io.RandomAccessFile.readFully(RandomAccessFile.java:394)
    at learning.main(learning.java:21)

and i cant figure out why i get this, i though maby RandomFileAccess wasn't the right class to use but the only thing i could find said this should work

Any help on how to read CD's from java would be much appreciated.

Cheers Daniel

yes im sure it is, i ran "cdrecord -v dev=/dev/sr0 -toc", which is meant to print out the Table Of Contents of the CD and it dident give any errors — Daniel Braithwaite, Oct 14 '12 at 04:58

score 3 · Answer 1 · edited Dec 11 '12 at 12:49

3

First of all you should mount on a directory which the user logged in the OS Linux have access. E.g. : /mnt/cdrom or /media/cdrom

After that open your mp3 file or audio file :

File cd = new File( "/dev/sr0/track1.mp3" );

or

File cd = new File( "/dev/sr0/track1.dat" );

(don't forget the extension of the Audio or Mp3 file).

edited Dec 11 '12 at 12:49

Aleksandr M

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answered Dec 11 '12 at 12:32

Rija Ramampiandra

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score 0 · Answer 2 · edited May 23 '17 at 12:27

0

This isn't exactly the same, but I suspect it will get you going...

Is there a platform independent way (Java?) to read an audio CD's TOC?

If you don't want to use the built in stuff (for educational reasons), http://www.tritonus.org/ is open source so you might be able to look at how they did it.

edited May 23 '17 at 12:27

Community

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answered Oct 14 '12 at 04:54

Gus

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score 0 · Answer 3 · edited May 23 '17 at 12:18

This question has a related problem and answer that is pertinent to your problem: Mount and unmount hard drives

According to the linked question and accepted answer, the answer is both "Yes" and "No". You can provide a Java API that use adapter pattern for native interface, but you will also have to do a number of things, thus making the solution not purely Java, but a hybrid:

create Java interfaces that support mount/unmount commands create
classes that implements interfaces as native methods create native
implementations of this commands in C or other language. One
implemantation for OS (Win, Mac, Linux) pack it to one jar build
small factory that provide implementation of interface and load native libraries

score 0 · Answer 4 · answered Oct 14 '12 at 05:03

0

If /dev/sr0 is directory, then there is a problem. Please try passing one of the audio files as parameter e.g.

        File cd = new File( "/dev/sr0/track1" );

That should be working.

answered Oct 14 '12 at 05:03

Yogendra Singh

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When i try that it gives me an error for the line "RandomAccessFile rawAccess = new RandomAccessFile( cd, "r" );" saying that it isn't a directory – Daniel Braithwaite Oct 14 '12 at 10:23

Problems with java and reading data from a CD drive in linux

4 Answers4