Re: [Discuss-gnuradio] Can't create Out of Tree Tagged Stream Blocks?

[Michael Dickens]

Hi DL - 2 primary thoughts:

1) To "create" a tagged stream block in your OOT using gr_modtool (if it doesn't do that as you desire), find an already existing tagged_stream block that you understand the programming of. Use gr_modtool to create a new "sync" block, then copy/paste from the existing tagged_stream block into your new one: 3 files: include/OOT/NAME.h ; lib/NAME_impl.h ; lib/NAME_impl.cc . The CMakeLists.txt will already be setup for compiling, assuming you don't need any special definitions or linkage or whatever. Then, edit those files to do what you want.

2) 1 million data points is a lot of points to do using a data stream! And even more if you used a tagged stream for all 1e6 samples! Do you need them all at the same time, or are the offsets small enough that you just need a small number of data samples stored before you can alight them? Alternative implementations might include using PDUs ... but much depends on what exactly you're trying to accomplish beyond what you wrote (what the actual algorithm is you're trying to implement).

Hope this is useful! - MLD

On Mon, Jul 22, 2019, at 11:28 AM, Lundberg, Daniel via Discuss-gnuradio wrote:

I am working within Gnuradio version 3.7.13.4.  As far as I can tell, gr_modtool does not support tagged stream blocks for either python or C++.  Trying to make a new tagged stream block in C++ will create QA code, but does not make files for the actual block.  For python it will throw a hard error.  This appears to be a known issue:  https://github.com/gnuradio/gnuradio/issues/2489

 

Can someone point me to some documentation on how to implement an out of tree module without gr_modtool? 

 

If this is a non-starter, then here is my problem description.  I am open to suggestions on how to solve the problem without an OOT tagged stream block:

I need to implement a block that takes two generated signals with defined, very large (~ million sample) packet lengths that are produced at different times, align them on a sample-by-sample basis, and adds them.  I know how to do this within a tagged stream block.  I am open to ideas on how to do this without tagged streams, but I’m not sure how to do sample alignment of large packets without having them contained in a tagged stream block work function.

 

Thank you,

DL

 

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