Forum: GNU Radio Questino on Gnuradio as the client and VLC as the server

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Brook L. (Guest)
on 2009-02-21 01:56
(Received via mailing list)
Hi All,

I am using USRP to receive video streaming, and feed the data to a
socket as
the client. Then, I open a vlc as the server to open the network stream
via
UDP. The code is shown below.

# the server
vlc udp://@:2002

# the client, which is inserted into benchmark_rx.py in
/gnuradio-example/python/digital
def main():
    ......
    def rx_callback(ok, payload):
        ......
        print "ok = %5s  pktno = %4d  n_rcvd = %4d  n_right = %4d" %
(ok,
pktno, n_rcvd, n_right)

        rxdata.append(payload[2:])
        clientHost = 'localhost'           # servername is localhost'
        clientPort = 2002                   # use arbitrary port > 1024
        dgramSock = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )
#
create a UDP socket

        dgramSock.connect((clientHost,clientPort)) # connect to server
on
the port
        for ndx_data in rxdata:
            dgramSock.sendto( ndx_data, (clientHost, clientPort) )
# send the data
            data = dgramSock.recv(4096)                 # receive up to
4096
bytes
            #print data
        dgramSock.close()

    .......

My questions are:
1, I don't think the client(Gnuradio) and the server(VLC) are connected
via
UDP
2, Is it correct that I write the received data to a client UDP socket?
3, If I change the server to the following(don't use VLC as the server),
I
can play serverfile.mpeg using VLC. However, I don't want vlc to open
from
file.
serverHost = ''
serverPort = 2002
dgramSock = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )
dgramSock.bind( (serverHost, serverPort) )
msggot=[]
while 1:
  msg, (addr, port) = dgramSock.recvfrom(4096)
  print 'Server connected by', addr,port
  #print 'Server got ',msg
  dgramSock.sendto( msg, (addr, port) )

  fd = open('serverfile.mpeg','a')
  fd.write(msg)
  fd.close
dgramSock.close()

Overall, I want to play the realtime video that I received from USRP.
Can
anyone help me with these questions? I really appreciate.

Thanks,
Brook
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