Python Audio over Network Problems

Question

Hello I am having problems with audio being sent over the network. On my local system with no distance there is no problems but whenever I test on a remote system there is audio but its not the voice input i want its choppy/laggy etc. I believe its in how I am handling the sending of the audio but I have tried now for 4 days and can not find a solution.

I will post all relevant code and try and explain it the best I can

these are the constant/global values


    #initilaize Speex
    speex_enc = speex.Encoder()
    speex_enc.initialize(speex.SPEEX_MODEID_WB)
    speex_dec = speex.Decoder()
    speex_dec.initialize(speex.SPEEX_MODEID_WB)

    #some constant values
    chunk = 320
    FORMAT = pyaudio.paInt16
    CHANNELS = 1
    RATE = 44100

I found adjusting the sample rate value would allow for more noise

Below is the pyAudio code to initialize the audio device this is also global


    #initalize PyAudio
    p = pyaudio.PyAudio()
    stream = p.open(format = FORMAT,
                    channels = CHANNELS,
                    rate = RATE,
                    input = True,
                    output = True,
                    frames_per_buffer = chunk)

This next function is the keypress function which writes the data from the mic and sends it using the client function This is where I believe I am having problems.

I believe how I am handling this is the problem because if I press and hold to get audio it loops and sends on each iteration. I am not sure what to do here. (Ideas!!!)


    def keypress(event):
        #chunklist = []
        #RECORD_SECONDS = 5
        if event.keysym == 'Escape':
            root.destroy()
        #x = event.char
        if event.keysym == 'Control_L':   
            #for i in range(0, 44100 / chunk * RECORD_SECONDS):
            try:
                #get data from mic
                data = stream.read(chunk)
            except IOError as ex:
                if ex[1] != pyaudio.paInputOverflowed:
                    raise
                data = '\x00' * chunk
            encdata = speex_enc.encode(data)        #Encode the data.
            #chunklist.append(encdata)
            #send audio
            client(chr(CMD_AUDIO), encrypt_my_audio_message(encdata))

The server code to handle the audio


    ### Server function ###
    def server():
        PORT = 9001
        ### Initialize socket 
        server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        server_socket.bind((socket.gethostbyname(socket.gethostname()), PORT))
        # socket.gethostbyname(socket.gethostname())
        server_socket.listen(5)
        read_list = [server_socket]
        ### Start receive loop
        while True:
            readable, writable, errored = select.select(read_list, [], [])
            for s in readable:
                if s is server_socket:
                    conn, addr = s.accept()
                    read_list.append(conn)
                    print "Connection from ", addr
                else:
                    msg = conn.recv(2048)
                    if msg:                
                        cmd, msg = ord(msg[0]),msg[1:]
                        ## get a text message from GUI
                        if cmd == CMD_MSG:
                            listb1.insert(END, decrypt_my_message(msg).strip() + "
")
                            listb1.yview(END)
                        ## get an audio message
                        elif cmd == CMD_AUDIO:
                            # make sure length is 16 --- HACK ---
                            if len(msg) % 16 != 0:
                                msg += '\x00' * (16 - len(msg) % 16)
                            #decrypt audio
                            data = decrypt_my_message(msg)
                            decdata = speex_dec.decode(data)
                            #Write the data back out to the speaker
                            stream.write(decdata, chunk)
                    else:
                        s.close()
                        read_list.remove(s)

and for completion the binding of the keyboard in Tkinter


    root.bind_all('', keypress)

Any ideas are greatly appreciated how I can make that keypress method work as needed or suggest a better way or maybe I am doing something wrong altogether

*cheers

Please note I have tested it without the encryption methods also and same thing :-)

Python Audio over Network Problems

Answers (1)

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