Re: [Discuss-gnuradio] Audio underrun when using Audio Sink

[Marcus Müller]

At which rate is that tun_source running? and still: what's the specs on
your band-pass filter?


On 20.06.2016 20:32, Paul S wrote:
> Hi Kevin & Marcus,
>
> thank you for your answers. After a while of testing I've got interesting
> results. Firstly, even though it brought 100% CPU load on one core, the
> packet encoder is not a problem as the underruns also occured without it.
> Anyway, thank you for your suggestion, I'll certainly look into it. Do you
> have a link for a thread or something like that where Felix Wunsch mentioned
> this? And your example: Does that mean I could use this method on on one
> frequency alone?
>
> Secondly, I had about 25% CPU load on all cores for the first flowgraph,
> except for when I got these underruns where my CPU load promptly exploded to
> 100%. However, I'd blame this rise on the underruns themselves as everything
> was fine shortly before (maybe because of busy waiting?).
> Nevertheless I've splitted the resampler and I am now using 4 resamplers in
> a row to get a interpolation of ~100. Both the Socket PDU and the File
> Source are producing only occasionally underruns but apart from this they
> are doing fine now. Unfortunately the TunSource block is still producing
> lots of them (although it's less frequently now). Here's the code for the
> TunSource. Maybe you can see what's wrong.
>
>
>     def work(self, input_items, output_items):        
>       out = output_items[0]   
>         # Read from tun device 
>         packet = tun.read()
>         tun.printPkg(packet)
>         
>         # Extract the header
>         header = packet[:20]
>         unpacked = unpack('!BBHHHBBH4s4s',header)
>         size = unpacked[4]
>       buf = packet[32:]
>         # cast buffer to (iterable) list
>         myarray = list(buf)
>
>         # Counter variable for position in output array
>         j = 0
>         for i in myarray:
>             num = 0
>             try:
>                 num = (numpy.int8(ord(i)))
>             except ValueError:
>                 num = chr(0)
>             output_items[0][j] = num
>             j = j+1
>         return len(buf)
>
>
> Regards
> Paul
>
>
>
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