class MpdGpio:
''' Constants. Don't change! '''
STATE_STARTUP = 0;
STATE_NORMAL = 1;
mpd = None
screen = None
timer = None
status = dict()
observers = []
timer = None
# Constructor
def __init__(self):
# Set state
self.status['state'] = self.STATE_STARTUP
# Setup MPD client
self.mpd = MPDClient()
self.mpd.timeout = 10 # network timeout in seconds (floats allowed), default: None
self.mpd.idletimeout = None
# Setup GPIO
self.GPIO = GPIO
self.GPIO.setwarnings(False)
self.GPIO.setmode(GPIO.BOARD)
# Add button callbacks
GPIO.setup(PIN_PAUZE_PLAY, GPIO.IN)
GPIO.setup(PIN_VOLUME_UP, GPIO.IN)
GPIO.setup(PIN_VOLUME_DOWN, GPIO.IN)
GPIO.add_event_detect(PIN_PAUZE_PLAY, GPIO.RISING, callback=self.pauseOrPlay, bouncetime=BUTTON_BOUNCETIME)
GPIO.add_event_detect(PIN_VOLUME_UP, GPIO.RISING, callback=self.volumeUp, bouncetime=BUTTON_BOUNCETIME)
GPIO.add_event_detect(PIN_VOLUME_DOWN, GPIO.RISING, callback=self.volumeDown, bouncetime=BUTTON_BOUNCETIME)
# Start LCD
self.screen = Screen(self)
self.screen.onStatusChange()
print(self.getIpAddress())
# Start timer
self.timer = Timer()
self.timer.addRepeatingTask(POLLING_INTERVAL, self.updateMpdStatus)
#self.timer.addRepeatingTask(SCREEN_UPDATE_INTERVAL, self.screen.tick)
self.timer.start()
# Getters
''' Get the GPIO interface '''
def getGPIO(self):
return self.GPIO
def getStatus(self):
return self.status
''' Get the current IP address or None if it doesn't have one '''
def getIpAddress(self):
try:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(('google.com', 0))
return s.getsockname()[0]
except Error as e:
return None
# Methods
''' Add a state observer to the list of observers. The observer had to have an onStatusChange() callback '''
def addObserver(self, observer):
self.observers.append(observer)
''' Notify the observers that the status has changed '''
def notifyObservers(self):
for observer in self.observers:
observer.onStatusChange()
def updateMpdStatus(self):
done = False
while not done:
try:
self.status['mpd'] = self.mpd.status()
self.status['song'] = self.mpd.currentsong()
if self.status['state'] == self.STATE_STARTUP:
self.status['state'] = self.STATE_NORMAL
self.notifyObservers()
done = True
#print(str(self.status))
#print(str(self.song))
except ConnectionError as e:
print(str(e))
self.mpdConnect()
def mpdConnect(self):
self.mpd.connect(MPD_ADDRESS, MPD_PORT)
def pauseOrPlay(self, channel):
if 'state' in self.status['mpd']:
if self.status['mpd']['state'] == 'play':
try:
self.mpd.pause(1)
self.status['mpd']['state'] = 'pause'
print('Pause')
except: pass
else:
try:
self.mpd.pause(0)
self.status['mpd']['state'] = 'play'
print('Play')
except: pass
self.notifyObservers()
def volumeUp(self, channel):
if 'volume' in self.status:
try:
vol = int(self.status['mpd']['volume'])
except:
vol = 0
if vol < 100:
try:
self.mpd.setvol(vol + 1)
self.status['mpd']['volume'] = str(vol+1)
self.notifyObservers()
print('Volume Down: ' + str(vol + 1))
except: pass # Sometimes ProtocolError occurs
def volumeDown(self, channel):
if 'volume' in self.status:
try:
vol = int(self.status['mpd']['volume'])
except:
vol = 100
if vol > 0:
try:
self.mpd.setvol(vol - 1)
self.status['mpd']['volume'] = str(vol-1)
self.notifyObservers()
print('Volume Down: ' + str(vol - 1))
except: pass # Sometimes ProtocolError occurs
