type : url
    url
    title
    path
    duration
    thundnail
    user
    ready (validation, no, downloading, yes)

type : playlist
    url
    ready
    playlist_title
    nb_track_allowed
    nb_track_playlist
    max_track_allowed
    start_index
    current_index
    current url
    current_title
    current_duration
    current_thundnail
    current_ready (validation,no, downloading, yes)
    next_ready (validation,no, downloading, yes)
    user


type : radio
    url
    name
    current_title
    user

type : file
    path
    title
    duration
    user