From 208d12662c220e9d7586486942d2040c0fb4e46e Mon Sep 17 00:00:00 2001
From: Tilman <tliero@gmx.net>
Date: Fri, 30 Nov 2018 08:19:15 +0000
Subject: [PATCH] piplayer4.py

---
 code/piplayer4.py | 166 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)

diff --git a/code/piplayer4.py b/code/piplayer4.py
index e69de29..ca310b9 100644
--- a/code/piplayer4.py
+++ b/code/piplayer4.py
@@ -0,0 +1,166 @@
+# piplayer3 - AudioLauncher
+# http://www.tilman.de/piplayer3
+
+import RPi.GPIO as GPIO
+import logging
+import time
+import subprocess
+import select  # for polling zbarcam, see http://stackoverflow.com/a/10759061/3761783
+import os
+import urllib
+from socketIO_client import SocketIO, LoggingNamespace # https://gist.github.com/ivesdebruycker/4b08bdd5415609ce95e597c1d28e9b9e
+
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s %(levelname)s - %(message)s')
+logging.info('Initializing')
+
+# Configuration
+MUSIC_BASE_DIRECTORY = "mnt/NAS/"
+SOUND_SCANNING = "~/sounds/scanning.mp3"
+SOUND_OK = "~/sounds/ok.mp3"
+SOUND_SCAN_FAIL = "~/sounds/fail.mp3"
+SOUND_PLAYBACK_ERROR = "~/sounds/error.mp3"
+QR_SCANNER_TIMEOUT = 3
+
+
+pending_play = False
+is_paused = True
+
+# photo sensor on PIN 17
+PIN_SENSOR = 17
+
+# IR LED on PIN 22
+PIN_IR_LED = 22
+
+# LED on PIN 27
+PIN_LED = 27
+
+# Buttons on PINs 9, 10 and 11
+PIN_PREV = 9
+PIN_PLAY = 10
+PIN_NEXT = 11
+
+socketIO = SocketIO('127.0.0.1', 3000)
+
+
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(PIN_SENSOR, GPIO.IN)
+GPIO.setup(PIN_IR_LED, GPIO.OUT)
+GPIO.output(PIN_IR_LED, GPIO.LOW)
+GPIO.setup(PIN_LED, GPIO.OUT)
+GPIO.output(PIN_LED, GPIO.LOW)
+GPIO.setup(PIN_PREV, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+GPIO.setup(PIN_PLAY, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+GPIO.setup(PIN_NEXT, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+
+
+
+def play_sound(filename):
+    socketIO.emit('clearQueue')
+    logging.debug('Cleared queue, now playing ' + filename)
+    pending_play = True
+    socketIO.emit('addToQueue', {'uri':filename})
+
+def prev_callback(channel):
+    logging.info("PREVIOUS")
+    socketIO.emit('previous')
+    ## TODO implement seek
+     
+def play_callback(channel):
+    if (is_paused):
+        logging.info("PLAY")
+        socketIO.emit('play')
+        is_paused = False
+    else:
+        logging.info("PAUSE")
+        socketIO.emit('pause')
+        is_paused = True
+
+def next_callback(channel):
+    logging.info("NEXT")
+    socketIO.emit('next')
+    ## TODO implement seek
+
+def on_pushQueue(*args):
+    logging.debug("pushQueue: " + args[0])
+    if pending_play:
+        if not args[0]:
+            play_sound(SOUND_PLAYBACK_ERROR)
+        else:
+            socketIO.emit('play')
+            pending_play = False
+
+
+GPIO.add_event_detect(PIN_PREV, GPIO.FALLING, callback=prev_callback, bouncetime=400)
+GPIO.add_event_detect(PIN_PLAY, GPIO.FALLING, callback=play_callback, bouncetime=400)
+GPIO.add_event_detect(PIN_NEXT, GPIO.FALLING, callback=next_callback, bouncetime=400)
+
+
+try:
+    # play_sound(SOUND_OK)
+
+    socketIO.on('pushQueue', on_pushQueue)
+    
+    while True:
+        logging.info('Wait for photo sensor')
+        GPIO.wait_for_edge(PIN_SENSOR, GPIO.RISING)
+        
+        logging.info('Photo sensor active, activating light and camera')
+        play_sound(SOUND_SCANNING)
+        
+        # turn LED on
+        GPIO.output(PIN_LED, GPIO.HIGH)
+        
+        # scan QR code
+        zbarcam = subprocess.Popen(['zbarcam', '--quiet', '--nodisplay', '--raw', '-Sdisable', '-Sqrcode.enable', '--prescale=320x240', '/dev/video0'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        
+        poll_obj = select.poll()
+        poll_obj.register(zbarcam.stdout, select.POLLIN)
+        
+        # wait for scan result (or timeout)
+        start_time = time.time()
+        poll_result = False
+        while ((time.time() - start_time) < QR_SCANNER_TIMEOUT and (not poll_result)):
+            poll_result = poll_obj.poll(100)
+
+        if (poll_result):
+            
+            # play confirmation sound
+            play_sound(SOUND_OK)
+            socketIO.emit('removeFromQueue', 0)
+            
+            qr_code = zbarcam.stdout.readline().rstrip()
+            qr_code = qr_code.decode("utf-8") # python3
+            logging.info("QR Code: " + qr_code)
+            
+            pending_play = True
+            
+            if (not (qr_code.startswith("http://")):
+                # create full path
+                if (qr_code.startswith("/")):
+                    qr_code = qr_code[1:]
+                full_path = MUSIC_BASE_DIRECTORY + qr_code
+                socketIO.emit('addToQueue', {'uri':full_path})
+            else:
+                socketIO.emit('addToQueue', {'service':'webradio','uri':qr_code})
+            
+        else:
+            logging.warning('Timeout on zbarcam')
+            play_sound(SOUND_SCAN_FAIL)
+            
+        zbarcam.terminate()
+        GPIO.output(PIN_LED, GPIO.LOW)
+
+        # wait until sensor is not blocked anymore
+        if (GPIO.input(PIN_SENSOR) == GPIO.HIGH):
+            GPIO.wait_for_edge(PIN_SENSOR, GPIO.FALLING)
+            time.sleep(1)
+
+        
+# Exit when Ctrl-C is pressed
+except KeyboardInterrupt:
+    logging.info('Shutdown')
+    
+finally:
+    logging.info('Reset GPIO configuration and close')
+    GPIO.cleanup()