#!/usr/bin/env python
import time
import serial
import os
import subprocess

ser = serial.Serial(port='/dev/ttyUSB0',baudrate = 9600,parity=serial.PARITY_NONE,stopbits=serial.STOPBITS_ONE,bytesize=serial.EIGHTBITS,timeout=1)
last = "0"
cmd1="pactl list sink-inputs | grep -B 18 -i 'VLC media player (LibVLC 3.0.16)' | grep -i 'Entrada de destino' | awk '{print $4}'"
vlcID = subprocess.Popen(cmd1,shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE,universal_newlines=True); vlcOut,vlcErr=vlcID.communicate(); rc=vlcID.wait()
vlcOut = vlcOut[1:]
vlcOut = vlcOut.replace('\n', '')

print("ID del VLC para usar con pactl: " + vlcOut)

while 1:
  x = ser.readline()
  x = x.decode()
  x = x.replace('\n', '')
  x = x.replace('\r', '')

  if ( x != last ):
    vlcID = subprocess.Popen(cmd1,shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE,universal_newlines=True); vlcOut,vlcErr=vlcID.communicate(); rc=vlcID.wait()
    vlcOut = vlcOut[1:]
    vlcOut = vlcOut.replace('\n', '')
    #cmd2 = "amixer set Master " + str(x) + "%"
    #cmd2 = "amixer set Headphone " + str(x) + "%"
    cmd2 = "pactl set-sink-input-volume " + vlcOut + " " + str(x) + "%"
    print(cmd2)
    os.system(cmd2)
    last = x