[op25-dev] Re: Correct decoder: op25_decoder_ff.cc or op25_decoder_bf.cc

trinmole lukekb at gmail.com
Thu Sep 5 01:54:50 UTC 2013

I just found Steve's earlier posts explaining that op25_decoder_ff.cc was depreciated and to stick a slicer in front of the bf version. I also realized that the OP25 GRC blocks came from Baz. I was able to figure out how hook everything together by looking at that. 

After setting the return from general_work in op25_decoder_bf to n, so it only gives output when samples are received, I am able to record P25 CAI voice channels off of a SmartNet system using C++.

I would like to be able to record multiple channels at the same time using multiple instances of OP25. The problem is that I don't think I have enough CPU. I am monitoring 8Mhz of spectrum because the channels are pretty spread out. 

Are there any performance tweaks I could try to improve CPU utilization? Are there any Static variables or other things that would make running multiple instances of OP25 or libmbe tough?

 - Luke

--- In op25-dev at yahoogroups.com, "trinmole" <lukekb at ...> wrote:
> I am trying to use the OP25 blocks for a C++ program. I have everything running fine as a .GRC. I also have a makefile to bundle everything up into a library.
> I am confused which C++ blocks I should be using - should it be op25_fsk4_demod_ff.cc connected to op25_decoder_ff.cc ?
> op25_decoder_ff.h get exported to /usr/include/ however only op25_decoder_bf.cc is included in the Makefile.am
> There is no op25_fsk_demod_fb.cc so I am not sure how I would connect the decoder_bf block in.
> What are the correct C++ blocks to use to replicate the "OP25 FSK4 Demod" & "OP25 Deocder" Python Blocks?
> Are there any C++ programs I could use as an example?
> Thanks for any pointers!
>  - Luke

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