mylive - livestreamer simplified frontend

#!/bin/bash

_twitch=('twitch' 'twitch.tv/')
_hitbox=('hitbox''hitbox.tv/')
_mlg=('mlg' 'mlg.tv/')
_chaturbate=('chaturbate' 'chaturbate.com/')
_dailymotion=('dailymotion' 'dailymotion.com/')
_ustream=('ustream' 'ustream.tv/')

_quality=('audio' 'high' 'low' 'medium' 'mobile' 'worst' 'source' 'best')

_service=''

if [ $# = 3 ]; then
    case $1 in
        ${_twitch[0]}) _service=${_twitch[1]}
        ;;
        ${_hitbox[0]}) _service={_hitbox[1]}
        ;;
        ${_mlg[0]}) _service=${_mlg[1]}
        ;;
        ${_chaturbate[0]}) _service=${_chaturbate[1]}
        ;;
        ${_dailymotion[0]}) _service=${_dailymotion[1]}
        ;;
        ${_ustream[0]}) _service=${_ustream[1]}
        ;;
        *) echo 'Wrong service name'
        ;;
    esac
    for i in "${_quality[@]}"
    do
        if [ $3 = $i ]; then
            nohup livestreamer -p baka-mplayer $_service$2 $3 &>/dev/null &
            exit 0
        fi
    done
    echo 'Choose a valid quality.'
    exit 1
fi