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<p>FYI, some versions of libboost cause bugs/crashes in the valve. Specifically (the last time I checked) the versions that come packaged with ubuntu. Compiling from latest source does not have any issues (that I've seen). Also, Stream-selector in place of a valve I've had less issues with.<br>
<br><br><div class="gmail_quote">On Wed, Aug 1, 2012 at 2:51 AM, Dmitry Medvedev <span dir="ltr"><<a href="mailto:qaghqga@yahoo.com" target="_blank">qaghqga@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left:1px #ccc solid;">
<div><div style="font-size:12pt;font-family:times new roman,new york,times,serif;"><div><div><div style="font-size:12pt;font-family:times new roman,new york,times,serif;"><div><span>Yes, valve is the block I was looking for. But, first try did not turn well: it works for a while, turning channels on and off, but after 10-100 switches something goes wrong and I get OOOOO. Experiments with dynamic reconfiguration gave me the same results (+memory leak, is there way to tell from python to release block memory after disconnect?). Maybe it's related to threading, as I turn valves on/off from separate thread. I'll try this again in some days.</span><span><br>
</span></div><div>Regarding the code: right not it's no more than a heap
of proof-of-concept python code not tightly connected to gnuradio. Gnuradio part consists of application with multiple channels. Each channel is xlating fir -> quadrature demod -> symbol filter -> fsk4_demod -> slicer -> frame assembler --msg queue-->
custom UDP sender (it adds frequency id to udp packet).</div><div>And there are standalone python program which receives UDP frames and stores it in db-like format. Further programs work on this files in pure python.</div>
<div>I'll release code in some days after I clean it up a little.</div><div><br></div><div>Best regards,</div><div>Dmitry<br></div><div class="hm HOEnZb"><div><br></div></div><div style="font-family:times new roman,new york,times,serif;font-size:12pt;">
<div class="hm HOEnZb"> </div><div style="font-family:times new roman,new york,times,serif;font-size:12pt;"><div class="hm HOEnZb"> <div dir="ltr">
<font face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b>
Matt Mills <<a href="mailto:mmills@2bn.net" target="_blank">mmills@2bn.net</a>><br> <b><span style="font-weight:bold;">To:</span></b> <a href="mailto:qaghqga@yahoo.com" target="_blank">qaghqga@yahoo.com</a> <br> <b><span style="font-weight:bold;">Sent:</span></b> Tuesday, July 31, 2012 2:20 PM<br>
<b><span style="font-weight:bold;">Subject:</span></b> Re: [op25-dev] Control channel decoding<br> </font> </div></div><div><div class="h5"> <br>
<div>Dmitry,<br><br>I'd suggest using a valve or stream selector for that. Do you have any interest in sharing your source code?<br><br>Thanks,<br>Matt.<br><br><div>On Tue, Jul 31, 2012 at 2:09 AM, Dmitry Medvedev <span dir="ltr"><<a rel="nofollow" href="mailto:qaghqga@yahoo.com" target="_blank">qaghqga@yahoo.com</a>></span> wrote:<br>
<blockquote style="border-left:1px #ccc solid;">
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<div style="font-size:12pt;font-family:times new roman,new york,times,serif;"><div>I'm writing multichannel p25 recorder. It mostly works (thanks to op25 team and other contributors). Is there any open documentation on
control channel messages, especially TSBK frames? I did trellis
decoding and CRC algorithm (reverse engineered the later, as I couldn't
find parameters). I understand structure of some messages, for example
"Group Voice Channel Grant Update" (opcode 02, manufacturer id 00), but
many opcodes remain unknown. Do you have any leads on this? <br></div><div>Also, I'm
not very familiar with gnuradio, is there way to place some kind of
"gate" in flowgraph so some parts of it can be switched on/off by
external event? I want to use such feature to gate voice channels on/off
and do not waste processor cycles on filtering channels that do not
carry traffic at the
moment.</div><div><br></div><div>Best regards,</div><div>Dmitry<br></div></div>
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