arduino-mixer/python/start.py

from pycaw.pycaw import AudioUtilities
from pprint import pprint
import serial
import serial.tools.list_ports
import time

def main():
    print ("Starting Arduino Mixer...\n")
    
    # Get audio sessions
    sessions = AudioUtilities.GetAllSessions()
    print (str(len(sessions)) + " audio sessions found:")
    for session in sessions:
        print ("  " + str(session))

    # Init serial connection
    ports = serial.tools.list_ports.comports()
    if len(ports) == 0:
        print("\nNo Serial ports Available")
        exit()
    else:
        print ("\nSerial ports Available:")
        for port, desc, hwid in sorted(ports):
            print("  {}: {} [{}]".format(port, desc, hwid))
        
        board = serial.Serial()
        board.baudrate = 115200
        board.port = input("\nSelect COM port: ")
        board.open()

        print ("Waiting for arduino...")
        time.sleep(5)
        board.write("<HELLO>".encode("utf-8"))

        currentProgram = 0

        line = []
        
        newData = False
        recvInProgress = False
        startMarker = '60' # <
        endMarker = '62' # >

        while True:
            for c in board.read():
                if c == 62:
                    recvInProgress = False
                    newData = True
                if recvInProgress == True:
                    line.append(chr(c))
                if c == 60:
                    recvInProgress = True
                break

            if newData == True:
                dataArray = ''.join(line).split(',')
                command = dataArray[0]
                if len(dataArray) > 1:
                    data = dataArray[1]
                
                # Process data
                # TODO: Listen for programs being added, then send this again
                if command == "COUNT":
                    board.write(("<COUNT," + str(len(sessions)) + ">").encode())
                elif command == "SWITCH":
                    currentProgram = int(data)
                    program = sessions[currentProgram]

                    volume = program.SimpleAudioVolume.GetMasterVolume()
                    
                    if program.DisplayName == "@%SystemRoot%\System32\AudioSrv.Dll,-202":
                        name = "Systeem"
                    # TODO: This line is being overwritten somehow
                    elif session.Process and session.Process.name() == "firefox.exe":
                        name = "Firefox"
                    elif program.DisplayName != "":
                        name = str(program.DisplayName)
                    else:
                        name = str(session.Process and session.Process.name())
                    
                    board.write(("<NAME," + name + ">").encode())
                    board.write(("<GETVOL," + str(round(volume * 100)) + ">").encode())
                elif command == "SETVOL":
                    audio = sessions[currentProgram].SimpleAudioVolume

                    audio.SetMasterVolume(float(data) / 100, None)

                    volume = audio.GetMasterVolume()
                    board.write(("<GETVOL," + str(round(volume * 100)) + ">").encode())

                line = []
                newData = False

if __name__ == "__main__":
    main()