init

tobabp.py

@@ -0,0 +1,130 @@
+#!/usr/bin/env python
+#  Copyright (C) 2012 Michael Clemens
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import RPi.GPIO as GPIO
+import os
+import pyudev
+
+from mpd import (MPDClient, CommandError)
+from socket import error as SocketError
+from time import sleep
+
+# Configure MPD connection settings
+HOST = 'localhost'
+PORT = '6600'
+CON_ID = {'host':HOST, 'port':PORT}
+
+# Configure IO ports
+BUTTON = 17
+LED = 24
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(BUTTON, GPIO.IN)
+GPIO.setup(LED, GPIO.OUT)
+
+## Some functions
+def mpdConnect(client, con_id):
+        """
+        Simple wrapper to connect MPD.
+        """
+        try:
+                client.connect(**con_id)
+        except SocketError:
+                return False
+        return True
+
+def loadMusic(client, con_id, device):
+        os.system("mount "+device+" /music/usb")
+        os.system("/etc/init.d/mpd stop")
+        os.system("rm /music/mp3/*")
+        os.system("cp /music/usb/* /music/mp3/")
+        os.system("umount /music/usb")
+        os.system("rm /music/mpd/tag_cache")
+        os.system("/etc/init.d/mpd start")
+        os.system("mpc clear")
+        os.system("mpc ls | mpc add")
+        os.system("/etc/init.d/mpd restart")
+
+def flashLED(speed, time):
+        for x in range(0, time):
+                GPIO.output(LED, GPIO.LOW)
+                sleep(speed)
+                GPIO.output(LED, GPIO.HIGH)
+                sleep(speed)
+
+def updateLED(client):
+        # adjust LED to actual state
+        if client.status()["state"] == "play":
+                GPIO.output(LED, GPIO.LOW)
+        else:
+                GPIO.output(LED, GPIO.HIGH)
+
+def checkForUSBDevice(name):
+        res = ""
+        context = pyudev.Context()
+        for device in context.list_devices(subsystem='block', DEVTYPE='partition'):
+                if device.get('ID_FS_LABEL') == name:
+                        res = device.device_node
+        return res
+
+def main():
+        ## MPD object instance
+        client = MPDClient()
+        mpdConnect(client, CON_ID)
+
+        status = client.status()
+        print status
+
+        timebuttonisstillpressed = 0
+
+        flashLED(0.1, 5)
+        updateLED(client)
+
+        while True:
+                device = checkForUSBDevice("1GB") # 1GB is the name of my thumb drive
+                if device != "":
+                        # USB thumb drive has been inserted, new music will be copied
+                        flashLED(0.1, 5)
+                        client.disconnect()
+                        loadMusic(client, CON_ID, device)
+                        mpdConnect(client, CON_ID)
+                        print client.status()
+                        flashLED(0.1, 5)
+                        # wait until thumb drive is umplugged again
+                        while checkForUSBDevice("1GB") == device:
+                                sleep(1.0)
+                        flashLED(0.1, 5)
+                if GPIO.input(BUTTON) == True:
+                        if timebuttonisstillpressed == 0:
+                                # button has been pressed, pause or unpause now
+                                if client.status()["state"] == "stop":
+                                        client.play()
+                                else:
+                                        client.pause()
+                                updateLED(client)
+                        elif timebuttonisstillpressed > 4:
+                                # go back one track if button is pressed > 4 secs
+                                client.previous()
+                                flashLED(0.1, 5)
+                                timebuttonisstillpressed = 0
+                        timebuttonisstillpressed = timebuttonisstillpressed + 0.1
+                else:
+                        timebuttonisstillpressed = 0
+
+                sleep(0.1)
+
+# Script starts here
+if __name__ == "__main__":
+    main()