Re: [Discuss-gnuradio] Listen to Mp3 via FM broadcast

[didem colak]

hi all,

does the problem still continue?

also i have an error msg  at below.


address@hidden:~/Desktop/gnuradio/gnuradio-examples/python/usrp$ 
./didemdenemeraw.py -1 dodi.pls
Traceback (most recent call last):
  File "./didemdenemeraw.py", line 4, in ?
    from gnuradio import gr, eng_notation
ImportError: No module named gnuradio

i am using ubuntu 8.04 and python 2.5 .

thanks,


----- Original Message ----
From: Dimitris Symeonidis <address@hidden>
To: jingx kwan <address@hidden>
Cc: address@hidden
Sent: Tuesday, January 27, 2009 6:21:31 PM
Subject: Re: [Discuss-gnuradio] Listen to Mp3 via FM broadcast

could you post a link to this code?
I could take a look at it for you...

Dimitris Symeonidis
"If you think you're too small to make a difference, try sleeping with
a mosquito!" - Amnesty International



On Sun, Jan 25, 2009 at 21:00, jingx kwan <address@hidden> wrote:
> Hello,
>
> I just have the GNU Radio equipment setups and runs together with the Ubutun
> 8.10 with my Latitude D610 notebook.
> I have successfully test and the GNU software is running properly. Still, I
> have problem to run a code posted on-line by Elie Salameh. I typed and
> copied the code exactly as what it is, but I still fail.
>
> The error message said:
> address@hidden:~/gnuradio/gnuradio-examples/python/usrp$ ./gnu_fm2.py -l
> 2.plsNumber of items in list 3
>
> /home/usrp/gnuradio/gnuradio-examples/python/usrp/se-exp-steve-fossett-21jan09_0.Mp3
> /home/usrp/gnuradio/gnuradio-examples/python/usrp/se-tia-presidential-inaugurations-19jan09-CQ_0.Mp3
> /home/usrp/gnuradio/gnuradio-examples/python/usrp/jan-24-09-AS-Paul-Bunyan_0.Mp3
> Using TX d'board A: Flex 2400 Tx MIMO B
> Traceback (most recent call last):
>  File "./gnu_fm2.py", line 132, in <module>
>    wfm_tx()
>  File "./gnu_fm2.py", line 85, in __init__
>    if not self.set_freq(options.freq):
>  File "./gnu_fm2.py", line 123, in set_freq
>    r = self.u.tune(self.subdev.which, self.subdev, target_freq)
>  File "/usr/local/lib/python2.5/site-packages/gnuradio/usrp/usrp_swig.py",
> line 2688, in __tune
>    r = self._real_tune(chan, db, target_freq, tr)
>  File "/usr/local/lib/python2.5/site-packages/gnuradio/usrp/usrp_swig.py",
> line 2089, in _real_tune
>    return _usrp_swig.usrp_sink_c_sptr__real_tune(*args, **kwargs)
> TypeError: in method 'usrp_sink_c_sptr__real_tune', argument 2 of type 'int'
> ========================================
> the code
>
> #!/usr/bin/python
>
> from gnuradio import gr, eng_notation
> from gnuradio import usrp
> from gnuradio import audio
> from gnuradio import blks2
> from gnuradio.eng_option import eng_option
> from optparse import OptionParser
> from usrpm import usrp_dbid
> import math, re, sys, thread, time, tempfile, os, random
> from gnuradio.wxgui import stdgui2, fftsink2
> import wx
>
>
> # this function sends a command to Linux that will
> # use sox to transform mp3 to raw
> def mp3toraw(filename,outputfile):
>    print("nice -n 19 sox \"%s\" -r 32000 -t raw -f -l -c 1 %s\n" %
> (filename,outputfile))
>    os.system("nice -n 19 sox \"%s\" -r 32000 -t raw -f -l -c 1 %s" %
> (filename,outputfile))
> # this function will read the location of the mp3 files out of the
> #.pls file
> def read_playlist(fname):
>    input = open(fname, 'r')
>    playlist=[]
>    l = input.readline()
>    # NumberOfEntries
>    l = input.readline()
>    nentries = int(re.findall("NumberOfEntries=([0-9]+)",l)[0])
>    print "Number of items in list %d\n" % nentries
>    i = 1
>    while l:
>        l=input.readline()
>        filepath = re.findall("File[0-9]+=(.*)$",l)
>        if filepath:
>            print filepath[0]
>            playlist.append(filepath[0])
>            i = i + 1
>    input.close()
>    return(playlist)
> #this function will create a temprary .raw file that will used by the sox
> command
> def mktempfn():
>    tf = tempfile.mkstemp(".raw")
>    outputfile = tf[1]
>    os.close(tf[0])
>    os.remove(tf[1])
>    return(outputfile)
> # this code is used for mudulation
> # it takes options from the command line
> # most of this code is take from fm_tx4.py
> class wfm_tx:
>    def __init__(self):
>        parser = OptionParser (option_class=eng_option)
>        parser.add_option("-T", "--tx-subdev-spec",
> type="subdev",default=None,help="select USRP Tx side A or B")
>        parser.add_option("-f", "--freq", type="eng_float",default=90.1e6,
> help="set Tx frequency to FREQ (default 90.1e6)", metavar="FREQ")
>        parser.add_option("-l","--playlist", action="store",
> default="1.pls", help="MP3 playlist containing files to air.")
>        parser.add_option("","--debug", action="store_true",
> default=False,help="Launch Tx debugger")
>        (options, args) = parser.parse_args ()
>        if len(args) != 0:
>            parser.print_help()
>            sys.exit(1)
>        if options.playlist == None:
>            print "No playlist specified\n"
>            sys.exit()
>        # parse playlist
>        playlist = read_playlist(options.playlist)
>        # setup IQ rate to 320kS/s and audio rate to 32kS/s
>        self.u = usrp.sink_c()
>        self.dac_rate = self.u.dac_rate()                    # 128 MS/s
>        self.usrp_interp = 400
>        self.u.set_interp_rate(self.usrp_interp)
>        self.usrp_rate = self.dac_rate / self.usrp_interp    # 320 kS/s
>        self.sw_interp = 10
>        self.audio_rate = self.usrp_rate / self.sw_interp    # 32 kS/s
>        # determine the daughterboard subdevice we're using
>        if options.tx_subdev_spec is None:
>            options.tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
>        m = usrp.determine_tx_mux_value(self.u, options.tx_subdev_spec)
>        self.u.set_mux(m)
>        self.subdev = usrp.selected_subdev(self.u,options.tx_subdev_spec)
>        print "Using TX d'board %s" % (self.subdev.side_and_name(),)
>        self.subdev.set_gain(self.subdev.gain_range()[1])    # set max Tx
> gain
>
>        if not self.set_freq(options.freq):
>            freq_range = self.subdev.freq_range()
>            print "Failed to set frequency to %s. Daughterboard supports %s
> to %s" % (
>                eng_notation.num_to_str(options.freq),
>                eng_notation.num_to_str(freq_range[0]),
>                eng_notation.num_to_str(freq_range[1]))
>            raise SystemExit
>
>        self.subdev.set_enable(True)                        # enable
> transmitter
>        print "TX freq %1.2f MHz\n" % (options.freq/1e6)
>        gain = gr.multiply_const_cc(4000.0)
>        i = 0
>        while 1:
>            self.fg = gr.flow_graph()
>            outputfile = mktempfn()
>            # write raw sound to named pipe in background
>            thread.start_new_thread(mp3toraw,(playlist[i],outputfile))
>            # wait untill the conversion of mp3 to raw is completed
>            time.sleep(3)
>            print "File size %d\n" % int(os.stat(outputfile)[6])
>            #specify the source file
>            src = gr.file_source(gr.sizeof_float, outputfile, False)
>            #configure the modulation block
>            fmtx = blks.wfm_tx(self.fg, self.audio_rate,
> self.usrp_rate,max_dev=75e3, tau=75e-6)
>            # connect blocks
>            self.fg.connect(src, fmtx, gain, self.u)
>            print "starting to transmit\n"
>            self.fg.run()
>            print "done..."
>            # remove the temprary file
>            os.remove(outputfile)
>            # stop the sox command if it is still working
>            os.system("killall sox")
>    def set_freq(self, target_freq):
>        """
>        Set the center frequency we're interested in.
>        """
>        r = self.u.tune(self.subdev.which, self.subdev, target_freq)
>        if r:
>            print "r.baseband_freq
> =",eng_notation.num_to_str(r.baseband_freq)
>            print "r.dxc_freq      =",eng_notation.num_to_str(r.dxc_freq)
>            print "r.residual_freq
> =",eng_notation.num_to_str(r.residual_freq)
>            print "r.inverted      =", r.inverted
>            return True
>        return False
> if __name__ == '__main__':
>    wfm_tx()
>
>
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> Discuss-gnuradio mailing list
> address@hidden
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>
>


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