Re: [Discuss-gnuradio] RuntimeError: audio_alsa_source

[Brook Lin]

Thanks for all your suggestions. I tried this today: 
sudo ./tx_voice.py -f 120M -I plughw:0,0
>>> gr_fir_fff: using SSE
gr_buffer::allocate_buffer: warning: tried to allocate
   992 items of size 33. Due to alignment requirements
   4096 were allocated.  If this isn't OK, consider padding
   your structure to a power-of-two bytes.
   On this platform, our allocation granularity is 4096 bytes.
...............................................................

sudo ./rx_voice.py -f 120M -O plughw:0,0
>>> gr_fir_fff: using SSE
audio_alsa_sink[plughw:0,0]: Device or resource busy
Traceback (most recent call last):
  File "./rx_voice.py", line 138, in <module>
    main()
  File "./rx_voice.py", line 128, in main
    tb = my_top_block(demods[options.modulation], rx_callback, options)
  File "./rx_voice.py", line 67, in __init__
    self.audio_tx = audio_tx(options.audio_output)
  File "./rx_voice.py", line 55, in __init__
    audio_sink = audio.sink(44100, audio_output_dev)
  File "/usr/lib64/python2.5/site-packages/gnuradio/audio_alsa.py", line
236, in sink
    return _audio_alsa.sink(*args)
RuntimeError: audio_alsa_sink

I am using Basic Tx/RX. And I still don't understand how to transmit and
receive my own music via USRP. I also tried sudo ./usrp_wfm_rcv.py -f 91M -O
plughw:0,0 to record the FM radio to my computer. It gives me almost the
same error: audio_alsa_sink[plughw:0,0]: Device or resource busy. Can you
give me some clue to transmit and receive my own music file? Thanks a lot!

Brook

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