Re: [Discuss-gnuradio] gr.message_source question

[George Nychis]

It's possible that your sound card is being used by another application. 
 For example, firefox or audacious is using the card.  Make sure you're 
in the sound group and have permission to the device also.

- George


W. David Li wrote:
> Hi,
>
> I got a python class that contains a gr.message_source as in the
> following. When UDP packets came in "enqueue_pkt" was called. Packets
> were converted into stream and inserted into a gr.msg_queue. Now I tried
> to dump the stream to an audio device by connecting the message_source
> to an audio sink. I got an error message:
>
>           audio_alsa_sink[hw:0,0]: Device or resource busy
>
> What went wrong here?
>
> - David
>
> ---------------- code snipets ---------------
>
> class source(gr.hier_block2):
>     
>     def __init__(self):
>         
>         gr.hier_block2.__init__(self,
>                                 "local_vrf_source",
>                                 gr.io_signature(0,0,0),
>                                 gr.io_signature(0,0,0))
>         
>         self._message_source = gr.message_source(4) #Is this the right
> size?
>         self._message_queue  = self._message_source.msgq()
>         
>
>
>         
>     def enqueue_pkt(self, pkt):
>         """This will take UPD pakcets, converts them into stream
> gr_messsage
>         and enqueue to the message queue
>         """ 
>         try:
>             msg_sptr = gr.message_from_string(pkt) 
>             self._message_queue.insert_tail(msg_sptr)
>             
>             audio_sink = audio.sink(48000)
>             self.connect(self._message_source,audio_sink)
>             
>         except Exception,e:
>             print 'source:  exception: ', e
>
> ----------------- end of code snipets --------------------------
>
>
>
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