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Matt Mills mmills at 2bn.netFYI, 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. On Wed, Aug 1, 2012 at 2:51 AM, Dmitry Medvedev <qaghqga at yahoo.com> wrote: > 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/20120801/47e44c40/attachment.htm>