A versatile music player with its own JSON and Youtube audio library

Question

A versatile music player with its own JSON and Youtube audio library

As mentioned on this line:

private static final String CATALOG_URL =
"http://storage.googleapis.com/automotive-media/music.json";

This file contains list of trackshosted on Google online.

So, I think the full URL Jazz_In_Paris.mp3will be

https://www.youtube.com/audiolibrary/music/Jazz_In_Paris.mp3

but getting 404 Not Foundin the same way, I tried

https://www.youtube.com/audiolibrary/music/album_art.jpg

but again the result 404 Not Found

So here are my little ones questions:

1. What is the complete URL of `Jazz_In_Paris.mp3` and `album_art.jpg`

2. Where they have used site object "site" : "https://www.youtube.com/audiolibrary/music" in application (in which class and where)

3. Where I have to make changes in my code, If I would like to get JSON from my own Server "http://www.domain.com/services/music.json"

4. How can I create my own Youtube Audio Library, Like in my Library I would like to add my favourite youtube songs