Hardware Reference
In-Depth Information
Metadata
is data that describes some other sort of data. In this case, it is textual
data such as the name of the artist and track, which helps to describe the audio
data stored in an MP3 ile. For MP3s, this can be stored inside the MP3 ile
alongside the audio data.
he
vlc
library allows you to attach code to certain
events
, such as when the track is
changed on an MP3 ile. his allows you to have a function that is called any time the
selected event happens during playback.
1.
Open
jukebox2.py
using Python IDLE 3 and edit the code to add the last line:
import glob, random, sys, vlc, time
import RPi.GPIO as GPIO
from Adafruit_CharLCD import *
Here the code has been amended to import the modiied
Adafruit_CharLCD
library. You use
from Adafruit_CharLCD
instead of
import
because the
class in there is called
Adafruit_CharLCD
. hat means that, if you didn't use
import *
as we have done here, you would have to type
Adafruit_CharLCD.
AdafruitCharLCD
—which would seem silly!
2.
he next part of the code remains the same:
if len(sys.argv) <= 1:
print(“Please specify a folder with mp3 files”)
sys.exit(1)
folder = sys.argv[1]
files = glob.glob(folder+”/*.mp3”)
if len(files) == 0:
print(“No mp3 files in directory”, folder, “..exiting”)
sys.exit(1)
random.shuffle(files)
player = vlc.MediaPlayer()
medialist = vlc.MediaList(files)
mlplayer = vlc.MediaListPlayer()
mlplayer.set_media_player(player)
mlplayer.set_media_list(medialist)
GPIO.setmode(GPIO.BCM)
PLAY_BUTTON=11
STOP_BUTTON=7
BACK_BUTTON=4
FORWARD_BUTTON=10
GPIO.setup(PLAY_BUTTON, GPIO.IN)
