This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://email@example.com/.Dmitry Medvedev qaghqga at yahoo.com
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. 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). 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. I'll release code in some days after I clean it up a little. Best regards, Dmitry ________________________________ From: Matt Mills <mmills at 2bn.net> To: qaghqga at yahoo.com Sent: Tuesday, July 31, 2012 2:20 PM Subject: Re: [op25-dev] Control channel decoding Dmitry, I'd suggest using a valve or stream selector for that. Do you have any interest in sharing your source code? Thanks, Matt. On Tue, Jul 31, 2012 at 2:09 AM, Dmitry Medvedev <qaghqga at yahoo.com> wrote: > >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? > >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. > > >Best regards, >Dmitry > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/op25-dev/attachments/20120801/97e64594/attachment.htm>