I am trying to record data directly from a UDP stream to file. I have four
channels at 1.2MHz sample rate the code is below. Basically it opens a UDP
source and connects to a file sink. However, It is losing data when writing
to the file. If I stream a signal with a one second burst the spacing is not
correct. Also, I have another c++ program that reads the UDP packets and
records directly to file, and there are no lost UDP packets nor lost data
with this program. Also I have checked that the UDP packet size is less than
1472, it is currently at 1024 bytes.
Is there a way to see if file_sink is not able to handle that data rate, or
to see if the UDP source cannot keep up?
#!/usr/bin/env python
from gnuradio import gr
from gnuradio.wxgui import waterfallsink2, stdgui2, fftsink2,scopesink2
import wx
from optparse import OptionParser
from gnuradio.qtgui import qtgui
import os
import time
import thread
import threading
class gnuradioGUI(stdgui2.std_top_block):
def __init__(self,frame,panel,vbox,argv):
stdgui2.std_top_block.__init__(self,frame,panel,vbox,argv)
self.sr = 1200000
self.channels = 4
self.FileLength = 5 #seconds of data in each file
self.filenum = -1
self.baseName = "udp_1k."
self.file_increment()
self.ipAdd = "192.168.100.178" #the ip of this computer
self.port = 3456
self.bufSize = self.channels*4096
self.signal =
gr.udp_source(gr.sizeof_short,self.ipAdd,self.port)
self.Update()
self.thread = threading.Thread(target=self.FileThread)
self.thread.start()
def Update(self):
self.lock()
try:
self.disconnect(self.signal,self.dest)
except:
print "could not disconnect"
self.file_increment()
self.dest = gr.file_sink(gr.sizeof_short,self.saveFile)
self.connect(self.signal,self.dest)
self.unlock()
def FileThread(self):
while 1:
time.sleep(self.FileLength)
self.Update()
def file_increment(self):
self.filenum = self.filenum + 1
self.saveFile = self.baseName + "%d"%self.filenum
print "writing to file: " + self.saveFile
if __name__ == '__main__':
app = stdgui2.stdapp(gnuradioGUI,"CAIS signal using GNU Radio GUI")
parser = OptionParser()
parser.add_option("-w", "--file", dest="filename",
help="write data to FILE", metavar= "FILE")
(options, args) = parser.parse_args()
app.MainLoop()
os._exit(1)
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