MPD: vu-meter

mpd_dot3k.py

@@ -8,6 +8,8 @@ import queue
 import threading
 import signal
 import sys
+import os
+import audioop
 import dot3k.lcd as lcd
 import dot3k.backlight as backlight
 import dot3k.joystick as nav
@@ -51,6 +53,21 @@ char_stop = [
 
 q = queue.Queue()
 
+def vumeter():
+    fifo = os.open('/tmp/mpd.fifo', os.O_RDONLY)
+    while run_event.is_set():
+        try:
+            rawStream = os.read(fifo, 4096)
+        except OSError as err:
+            if err.errno == errno.EAGAIN or err.errno == errno.EWOULDBLOCK:
+                rawStream = None
+            else:
+                raise
+        if rawStream:
+            backlight.set_graph(audioop.rms(rawStream,2)/32768)
+    backlight.set_graph(0)
+
+
 def stringrotate(text, width, step):
     if len(text) > width:
         fulltext = text + " - "
@@ -71,10 +88,13 @@ def display():
             status = arg['status']['state']
 
             if status == "play":
+                backlight.rgb(0, 0, 255) # green
                 lcd.create_char(0, char_play)
             elif status == "pause":
+                backlight.rgb(0, 255, 0) # blue
                 lcd.create_char(0, char_pause)
             else:
+                backlight.rgb(255, 0, 0)
                 lcd.create_char(0, char_stop)
 
             if status not in {'play','pause'} or song_file != arg['song']['file']:
@@ -160,19 +180,22 @@ def button_right(pin):
 def on_exit(sig, func=None):
     run_event.clear()
     t_display.join()
+    t_vumeter.join()
     backlight.rgb(0, 0, 0)
     backlight.rgb(0, 0, 0)
     print("Screen sound be blank and light off now.")
     sys.exit(0)
 
-backlight.rgb(55, 55, 55)
+lcd.set_contrast(50)
 run_event = threading.Event()
 run_event.set()
 client = MPDClient()
 client.connect("localhost", 6600)
 
 t_display = threading.Thread(name='display',target=display)
+t_vumeter = threading.Thread(name='vumeter',target=vumeter)
 t_display.start()
+t_vumeter.start()
 
 signal.signal(signal.SIGTERM, on_exit)
 try: